阅读说明：本技术 含铁矿物高温烧结性能测算方法以及矿物烧结设备 (Method for measuring and calculating high-temperature sintering performance of iron-containing mineral and mineral sintering equipment ) 是由 曾飞骏 余治中 郭亮 尹浩 阳习端 邓联玉 周累 肖豪 彭洋 胥慧 刘会波 徐 于 2021-08-17 设计创作，主要内容包括：本申请公开了一种含铁矿物高温烧结性能测算方法以及含铁矿物烧结设备,测算方法包括如下步骤：预处理；烧结,通入体积含量20％～24％的CO-(2)以及体积含量75％～80％的N-(2)模拟烧结的燃烧气氛,并将待烧结样品先后进行两阶段烧结,第一阶段：烧结温度1000℃～1200℃,烧结时间3～8分钟,第二阶段：根据升温曲线调节升温速度,升温至1300℃～1500℃,烧结时间3～5分钟,完成后迅速冷却；测量；计算,根据高温烧结前后待烧结样品的质量以及体积的变化量以及体积和质量变化的比例,计算矿物烧结过程中的高温烧结性能数据。根据本申请实施例的测算方法,烧结步骤模拟实际烧结环境,烧结温度、烧结气氛以及烧结温度升温速率更贴合实际烧结情况,提升含铁矿物高温烧结性能的测算准确性。(The application discloses a method for measuring and calculating the high-temperature sintering performance of iron-containing minerals and iron-containing mineral sintering equipment, wherein the method for measuring and calculating the high-temperature sintering performance of the iron-containing minerals comprises the following steps: pre-treating; sintering, introducing CO with the volume content of 20-24% 2 And N in an amount of 75 to 80% by volume 2 Simulating a sintering combustion atmosphere, and sintering a sample to be sintered in two stages in sequence, wherein the first stage comprises the following steps: sintering temperature is 1000-1200 ℃, sintering time is 3-8 minutes, and the second stage is as follows: adjusting the temperature rise speed according to the temperature rise curve, raising the temperature to 1300-1500 ℃, sintering for 3-5 minutes, and rapidly cooling after completion; measuring; and calculating high-temperature sintering performance data in the mineral sintering process according to the mass, the volume change amount and the volume and mass change ratio of the sample to be sintered before and after high-temperature sintering. According to the measuring and calculating method, the actual sintering environment is simulated in the sintering step, the sintering temperature, the sintering atmosphere and the temperature rise rate of the sintering temperature are more fit with the actual sintering condition, and the measuring and calculating accuracy of the high-temperature sintering performance of the iron-containing mineral is improved.)

1. The method for measuring and calculating the high-temperature sintering performance of the iron-containing mineral is characterized by comprising the following steps

A pretreatment step, mixing mineral powder to be tested and a flux into a mixture, and pressing the mixture into blocks to obtain a sample to be sintered;

sintering, introducing CO with the volume content of 20-24 percent₂And N in an amount of 75 to 80% by volume₂Simulating a sintering combustion atmosphere, and sintering the sample to be sintered in two stages in sequence, wherein the first stage comprises the following steps: sintering temperature is 1000-1200 ℃, sintering time is 3-8 minutes, and the second stage is as follows: adjusting the temperature rising speed according to the temperature rising curve, rising the temperature to 1300-1500 ℃, sintering for 3-5 minutes, and rapidly cooling to room temperature after completion;

measuring the mass and volume change quantity and the mass and volume change proportion of the sample to be sintered before and after sintering;

and a calculating step, calculating high-temperature sintering performance data in the mineral sintering process according to the mass, the volume variation and the volume-mass variation ratio of the sample to be sintered before and after high-temperature sintering.

2. The method for measuring and calculating the high-temperature sintering property of the iron-containing mineral according to claim 1, wherein the preprocessing step specifically comprises

Screening the mineral powder to be detected to obtain micro mineral powder with the particle size of 0-0.5 mm;

taking a flux, and uniformly mixing the micro mineral powder and the flux to obtain a mixture;

and adding 7-10% of water by mass into the mixture, and maintaining the pressure for 1-5 min under the pressure of 5-30 MPa for forming to obtain the sample to be tested.

3. The method for measuring and calculating the high-temperature sintering performance of the iron-containing mineral according to claim 1, wherein before the sintering step, a pre-measurement step is further included, and the pre-measurement step includes

Taking a heat-resistant container and a heat-resistant sample holder, measuring a mass M1 of the heat-resistant container and a volume V1 of the heat-resistant container, measuring a volume V2 of the heat-resistant sample holder, and measuring a mass M3 of the sample to be sintered and a volume V3 of the sample to be sintered.

4. The method for measuring and calculating the high-temperature sintering property of the iron-containing mineral according to claim 3, wherein in the measuring step, after the sample to be sintered is sintered and cooled, a free-flowing portion bonded to the heat-resistant container and a sintering residue portion remaining on the heat-resistant sample holder are obtained, the combination of the free-flowing portion and the heat-resistant container is a first measuring body, and the sintering residue portion and the heat-resistant sample holder are a second measuring body;

separating the heat-resistant sample holder from the heat-resistant container to separate the first measuring body and the second measuring body, measuring a mass M4 of the first measuring body and a volume V4 of the first measuring body, and measuring a volume V5 of the second measuring body.

5. The method for measuring and calculating the high-temperature sintering performance of the iron-containing mineral according to claim 4, wherein the high-temperature sintering performance data comprises lump volume shrinkage Lt, free-flowing liquid phase volume Lfv, free-flowing liquid phase mass Lfm and free-flowing liquid phase proportion Lf, and the calculation formula is as follows:

Lt＝(V2+V3-V5)/V3×100％；

Lfv＝V4-V1；

Lfm＝M4-M1；

Lf＝(M4-M1)/M3×100％。

6. the method for measuring and calculating the high-temperature sintering performance of the iron-containing mineral according to claim 1, wherein in the sintering step, the temperature rise rate in the second stage is as follows: 80-120 ℃/min.

7. The method for measuring and calculating the high-temperature sintering performance of the iron-containing mineral according to claim 3, wherein the method further comprises a pre-baking step before the pre-measuring step, and the pre-baking step comprises

And placing the sample to be tested in an environment of 900-1100 ℃ for pre-roasting for 10-30 min.

8. An iron-containing mineral sintering apparatus for sintering a sample to be sintered according to any one of claims 1 to 7, the iron ore sintering apparatus comprising

The heating device comprises a heating furnace and a heating pipe arranged in the heating furnace;

the gas supply device is communicated with the interior of the heating furnace and is used for conveying sintering gas;

the sample feeding device comprises a push rod, a motor and a temperature sensor, wherein the push rod is electrically connected with the motor, and the temperature sensor is arranged at one end, close to the heating furnace, of the push rod;

and the control device is electrically connected with the heating pipe, the air supply device and the motor.

9. The iron-containing mineral sintering apparatus according to claim 8, wherein an end of the push rod adjacent to the heating furnace is provided with a fixing member for fixing a heat-resistant container.

10. The iron-containing mineral sintering apparatus according to claim 8, further comprising a display device electrically connected to the control device, the display device being capable of displaying a temperature within the heating furnace.

Technical Field

The application relates to the field, in particular to a method for measuring iron ore liquid phase generation proportion data and iron ore sintering equipment.

Background

The development of the steel production industry in China is rapid, the steel yield exceeds 10 hundred million tons per year, more than 70 percent of the blast furnace ironmaking raw materials are provided by a sintering process at present, and stable and high-quality sinter provides guarantee for smooth operation of the blast furnace and improvement of the ironmaking efficiency. However, the fluctuation of the raw materials makes the sintering production difficult to run smoothly, and the optimization of the ore blending scheme is an effective means for solving the fluctuation of the raw materials.

Nowadays, optimization ore blending research changes the conventional mode of evaluating the sintering performance of the iron ore only by referring to the normal-temperature characteristics such as chemical components, granularity composition, granulation performance and the like, and more considers the sintering behavior characteristics of the iron ore at high temperature. In order to realize scientific and reasonable ore blending research, the basic sintering characteristics of iron-containing minerals need to be researched.

Disclosure of Invention

The embodiment of the application provides a method for measuring and calculating the high-temperature sintering performance of an iron-containing mineral, which can more accurately measure and calculate the sintering performance of the iron-containing mineral under the high-temperature condition and provides a basis for optimizing a subsequent ore blending scheme.

In a first aspect, an embodiment of the present application provides a method for measuring and calculating high-temperature sintering performance of an iron-containing mineral, including a preprocessing step, in which mineral powder to be measured and a flux are mixed into a mixture, and the mixture is pressed into a block shape to obtain a sample to be sintered; sintering, introducing CO with the volume content of 20-24 percent₂And N in an amount of 75 to 80% by volume₂Simulating a sintering combustion atmosphere, and sintering a sample to be sintered in two stages in sequence, wherein the first stage comprises the following steps: sintering temperature is 1000-1200 ℃, sintering time is 3-8 minutes, and the second stage is as follows: adjusting the temperature rising speed according to the temperature rising curve, rising the temperature to 1300-1500 ℃, sintering for 3-5 minutes, and rapidly cooling to room temperature after completion; measuring the mass and volume change quantity and the mass and volume change proportion of a sample to be sintered before and after sintering; and a calculating step, calculating high-temperature sintering performance data in the mineral sintering process according to the mass of the sample to be sintered before and after high-temperature sintering, the volume variation and the volume-mass variation ratio.

According to one aspect of the embodiment of the application, the pretreatment step specifically comprises screening the mineral powder to be detected to obtain micro mineral powder with the particle size of 0-0.5 mm; taking a flux, and uniformly mixing the micro mineral powder and the flux to obtain a mixture; adding 7-10% of water by mass into the mixture, and maintaining the pressure for 1-5 min under the pressure of 5-30 MPa for forming to obtain a sample to be measured.

According to an aspect of an embodiment of the present application, before the sintering step, a pre-measurement step is further included, the pre-measurement step including taking the heat-resistant container and the heat-resistant sample holder, measuring a mass M1 of the heat-resistant container and a volume V1 of the heat-resistant container, measuring a volume V2 of the heat-resistant sample holder, and measuring a mass M3 of the sample to be sintered and a volume V3 of the sample to be sintered.

According to an aspect of the embodiments of the present application, in the measuring step, after the sintering of the sintered sample is completed and cooled, a free-flowing portion bonded to the heat-resistant container and a sintering remainder remaining on the heat-resistant sample holder are obtained, a combination of the free-flowing portion and the heat-resistant container is a first measuring body, and the sintering remainder and the heat-resistant sample holder are a second measuring body; the heat-resistant sample holder was separated from the heat-resistant container to separate the first measuring body and the second measuring body, and the mass M4 of the first measuring body and the volume V4 of the first measuring body were measured, and the volume V5 of the second measuring body was measured.

According to an aspect of an embodiment of the present application, the high temperature sintering performance data includes a lump volume shrinkage Lt, a free-flowing liquid phase volume Lfv, a free-flowing liquid phase mass Lfm, and a free-flowing liquid phase ratio Lf, and the calculation formula is as follows:

Lt＝(V2+V3-V5)/V3×100％；

Lfv＝V4-V1；

Lfm＝M4-M1；

Lf＝(M4-M1)/M3×100％。

according to an aspect of the embodiment of the present application, in the sintering step, the temperature increase rate in the second stage is: 80-120 ℃/min.

According to one aspect of the embodiment of the application, before the pre-measuring step, a pre-roasting step is further included, wherein the pre-roasting step comprises the step of placing the sample to be tested in an environment with the temperature of 900-1100 ℃ for pre-roasting for 10-30 min.

In a second aspect, an embodiment of the present application provides an iron-containing mineral sintering apparatus for sintering a sample to be sintered, where the iron-containing mineral sintering apparatus includes a heating device, including a heating furnace and a heating pipe disposed in the heating furnace; the gas supply device is communicated with the interior of the heating furnace and is used for conveying sintering gas; the sample feeding device comprises a push rod, a motor and a temperature sensor, wherein the push rod is electrically connected with the motor, and the temperature sensor is arranged at one end of the push rod close to the heating furnace; and the control device is electrically connected with the heating pipe, the air supply device and the motor.

According to an aspect of the embodiment of the present application, the end of the push rod near the heating furnace is provided with a fixing member for fixing the heat-resistant container.

According to an aspect of the embodiment of the application, the heating furnace further comprises a display device, the display device is electrically connected with the control device, and the display device can display the temperature in the heating furnace.

In the method for measuring and calculating the high-temperature sintering performance of the iron-containing mineral, an actual sintering environment is simulated in the sintering step, the actual sintering environment comprises the sintering temperature, the sintering atmosphere and the sintering temperature heating rate, the actual sintering condition is better fitted, and the measuring and calculating accuracy of the high-temperature sintering performance of the iron-containing mineral can be improved.

Drawings

Other features, objects, and advantages of the present application will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.

FIG. 1 is a block flow diagram of a method for measuring and calculating high-temperature sintering performance of an iron-containing mineral according to an embodiment of the present application;

FIG. 2 is a schematic sectional view showing a heat-resistant container and a heat-resistant sample column in an example of the present application;

FIG. 3 is a schematic structural diagram of a free-flowing portion formed after sintering of a sample to be sintered in an embodiment of the present application;

FIG. 4 is a schematic structural view of an iron-containing mineral sintering apparatus according to an embodiment of the present application;

FIG. 5 is a graph showing the theoretical calculation results of the formation of free-flowing liquid phase at different temperatures for two iron-containing minerals in the examples of the present application.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present invention more clear, the present invention is described in detail with reference to specific embodiments below. It should be understood that the embodiments described in this specification are only for the purpose of explaining the present invention and are not intended to limit the present invention.

For the sake of brevity, only some numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form ranges not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and similarly any upper limit may be combined with any other upper limit to form a range not explicitly recited. Also, although not explicitly recited, each point or individual value between endpoints of a range is encompassed within the range. Thus, each point or individual value can form a range not explicitly recited as its own lower or upper limit in combination with any other point or individual value or in combination with other lower or upper limits.

In the description herein, it is to be noted that, unless otherwise specified, "above" and "below" are inclusive, and "one or more" of "plural" means two or more.

The above summary of the present invention is not intended to describe each disclosed embodiment or every implementation of the present invention. The following description more particularly exemplifies illustrative embodiments. At various points throughout this application, guidance is provided through a list of embodiments that can be used in various combinations. In various embodiments, the lists are provided as representative groups and should not be construed as exhaustive.

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

At present, the following methods are mainly used for testing the sintering performance of iron-containing minerals:

the prior method comprises the following steps: grinding the mineral powder, adding a flux according to chemical components of the mineral powder to enable the basicity of the agglomerate to reach 2.0, uniformly mixing, pressing into a cylinder with the diameter of 3mm and the height of 3mm, pushing the cylinder into a tube furnace by using a sample frame, and roasting at the temperature rise speed of 10 ℃/min in the air atmosphere; and recording and measuring the height variation of the sample by using a camera to obtain the relation between the shrinkage of the sample and the temperature and the liquid phase generation characteristic temperature. However, the method does not consider the equal chance that each material contacts the flux in the sintering process, but adopts the method of constant alkalinity for proportioning, which does not consider the influence of atmosphere and iron ore granularity on the generation of liquid phase, and the temperature rise speed is too slow, which is not in accordance with the sintering practice, and has limited guiding significance for the actual sintering proportioning.

The prior method II comprises the following steps: the method comprises the steps of finely grinding iron ore to 0-200 meshes, mixing the iron ore with a certain proportion of slaked lime, pressing the mixture into a triangular cone, roasting the mixture in a tube furnace at a heating rate of 10 +/-2 ℃/min in an air atmosphere, recording and measuring the change condition of the triangular cone shape in the heating process by a camera to obtain the liquid phase generation characteristic of the iron ore, and obtaining the liquid phase starting generation temperature, the liquid phase complete generation temperature, the liquid phase free flowing temperature and the liquid phase generation amount at 12801300 ℃. The method does not consider the influence of atmosphere and iron ore granularity on liquid phase generation, the temperature rise speed is too slow and is not consistent with actual sintering, and the test result has little significance for guiding actual sintering ore blending.

The existing method is three: crushing iron ore particles of 0-0.5 mm to 0-200 meshes, adding 15% of CaO pure reagent, pressing into cylindrical briquettes of 8mm in diameter under the pressure of 15MPa, performing rapid heating roasting by adopting an infrared rapid heating furnace to simulate sintering temperature rise speed, and controlling the atmosphere to be air atmosphere below 600 ℃ and nitrogen atmosphere above 600 ℃; the melt flow index is defined as the area over which the resulting liquid phase spreads after cooling is measured. The simulation of the test method on the sintering environment is very practical, but the influence of the mineral powder granularity on the generation of a liquid phase is not considered; in addition, the spreading area of the liquid phase is influenced by the high-temperature viscosity of the liquid phase melt besides the relation with the liquid phase quantity, and the melt flow index is actually a comprehensive parameter comprising the liquid phase generation quantity and the liquid phase viscosity, so that the comprehensive parameter increases the complexity of the sintering ore matching research.

At present, related research methods have certain defects, particularly, many methods are separated from the actual sintering process, and the measuring result and the evaluation system thereof have controversial significance for the guidance of the actual sintering. Therefore, a brand-new and scientific method which is more suitable for the liquid phase generation capacity of the iron ore sintering process in the actual sintering process has very important significance.

The embodiment of the application provides a method for measuring and calculating the high-temperature sintering performance of iron-containing minerals. The method for measuring and calculating the high-temperature sintering performance of the iron-containing mineral according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

FIG. 1 shows the high temperature of iron-containing minerals in the examples of the present applicationAs shown in fig. 1, the method for measuring and calculating the high-temperature sintering performance of an iron-containing mineral according to an embodiment of the present application includes the following steps, a preprocessing step, a sintering step, a measuring step, and a calculating step. The pretreatment step comprises the steps of mixing mineral powder to be tested and a flux into a mixture, and pressing the mixture into blocks to obtain a sample to be sintered; sintering, introducing CO with the volume content of 20-24 percent₂And N in an amount of 75 to 80% by volume₂Simulating a sintering combustion atmosphere, and sintering a sample to be sintered in two stages in sequence, wherein the first stage comprises the following steps: sintering temperature is 1000-1200 ℃, sintering time is 3-8 minutes, and the second stage is as follows: adjusting the temperature rising speed according to the temperature rising curve, rising the temperature to 1300-1500 ℃, sintering for 3-5 minutes, and rapidly cooling to room temperature after completion; the measuring step comprises measuring the mass and volume change quantity and the mass and volume change proportion of the sample to be sintered before and after sintering; the calculating step comprises calculating high-temperature sintering performance data in the mineral sintering process according to the mass of the sample to be sintered before and after high-temperature sintering, the volume variation and the volume-mass variation ratio.

In the method for measuring and calculating the high-temperature sintering performance of the iron-containing mineral, an actual sintering environment is simulated in the sintering step, the actual sintering environment comprises the sintering temperature, the sintering atmosphere and the sintering temperature heating rate, the actual sintering condition is better fitted, and the measuring and calculating accuracy of the high-temperature sintering performance of the iron-containing mineral can be improved.

In some embodiments of the application, the pretreatment step specifically includes screening the mineral powder to be detected to obtain micro mineral powder with a particle size of 0-0.5 mm; taking a flux, and uniformly mixing the micro mineral powder and the flux to obtain a mixture; adding 7-10% of water by mass into the mixture, and maintaining the pressure for 1-5 min under the pressure of 5-30 MPa for forming to obtain a sample to be measured. In the embodiment of the application, according to the sintering quasi-particle model, the sintering liquid phase is mainly generated by adhering powder materials of-0.5 mm, the particle size of the mineral powder to be measured is screened, the tailing powder of which the particle size is smaller than 0.5mm is selected, the reaction efficiency of particles is improved, and the accuracy of the measurement result is higher.

In some embodiments of the present application, a pre-measurement step is further included prior to the sintering step, the pre-measurement step including taking the heat-resistant container 1 and the heat-resistant sample holder 2. Fig. 2 is a schematic sectional view of the heat-resistant container 1 and the heat-resistant sample column 2 in the embodiment of the present application. The mass M1 of the heat-resistant container and the volume V1 of the heat-resistant container were measured, the volume V2 of the heat-resistant sample holder was measured, and the mass M3 of the sample to be sintered and the volume V3 of the sample to be sintered were measured.

In the embodiment of the application, the mass M1 of the heat container and the mass M3 of the sample to be sintered can be measured by using an electronic balance, and the volume V1 of the heat-resistant container and the volume V2 of the heat-resistant sample seat can be measured by using an Archimedes drainage method, so that the measurement accuracy is improved. The sample to be sintered is in a block shape, such as a cubic block or a cylindrical block, so that the volume V2 of the sample to be sintered can be calculated by measuring the side length or the diameter of the sample to be sintered, and an accurate volume value V3 can be obtained.

In some embodiments of the present application, the heat-resistant sample holder 2 comprises a base 201 and a sample holder 202. The base 201 is detachably connected to the sample holder 202. The base 201 is disposed in the heat-resistant container 1, and the sample holder 202 is disposed on the base 201. The sample 3 to be sintered is placed on the sample holder 202. According to the above-described embodiment, the free-flowing portion of the sample 3 to be sintered, which is generated during the high-temperature sintering, flows into the heat-resistant container 1 along the sample holder 202, the base 201, and adheres to the inner wall of the heat-resistant container 1. Fig. 3 is a schematic structural diagram of a free-flowing portion formed after sintering of a sample to be sintered in the embodiment of the present application. As shown in fig. 3, the free-flow portion 301 is integrated with the heat-resistant container 1. The sintering residue 302 remains on the heat-resistant sample holder 2.

In some embodiments of the present application, in the measuring step, after the sintering of the sintered sample is completed and cooled, a free-flowing portion bonded to the heat-resistant container 1 and a sintering remainder remaining on the heat-resistant sample holder 2 are obtained, the combination of the free-flowing portion and the heat-resistant container being the first measuring body 4, and the combination of the sintering remainder and the heat-resistant sample holder being the second measuring body 5; the heat-resistant sample holder was separated from the heat-resistant container to separate the first measuring body and the second measuring body, and the mass M4 of the first measuring body and the volume V4 of the first measuring body were measured, and the volume V5 of the second measuring body was measured.

In the high-temperature sintering process of the iron-containing minerals, liquid phase generated by sintering is in a flowing state at a high temperature. The sample to be measured is placed on the heat-resistant sample holder 2, and the flowing portion flows along the heat-resistant sample holder 2 into the heat-resistant container to be separated from other residual substances. The heat-resistant sample holder 2 is arranged in the heat-resistant container 1 and can be separated from the heat-resistant container 1, so that the part flowing into the heat-resistant container 1 is conveniently separated from the sintering residual part, the measurement accuracy of the flowing liquid phase part is improved, the operation is convenient, and the measurement efficiency is effectively improved.

In some embodiments of the present application, the base 201 is removably coupled to the sample holder 202. After sintering is completed, the sample holder 202 is detached from the base 201, and the free-flowing portion 301 and the sintering residue 302 are completely separated. The above structure can effectively improve the accuracy and efficiency of measuring the mass and volume of the free-flow portion 301.

In some embodiments of the present application, the high temperature sintering performance data includes the mass volumetric shrinkage Lt, the free-flowing liquid phase volume Lfv, the free-flowing liquid phase mass Lfm, and the free-flowing liquid phase fraction Lf, calculated as follows:

Lt＝(V2+V3-V5)/V3×100％；

Lfv＝V4-V1；

Lfm＝M4-M1；

Lf＝(M4-M1)/M3×100％。

according to the embodiment of the application, the volume shrinkage Lt of the briquette is calculated, and the change ratio of the volume of the sample to be sintered before and after sintering is calculated, so that the total volume of the iron-containing oxide and the flux participating in the reaction in the high-temperature sintering process is reflected. The volume Lfv of the free flowing liquid phase, the volume change of the sintered sample, the mass Lfm of the free flowing liquid phase and the mass change of the sintered sample are calculated, and the two data can reflect the generation amount of the free flowing liquid phase in the high-temperature sintering process. And the free flowing liquid phase proportion Lf calculates the ratio of the mass of the free flowing part to the total mass of the sample to be detected, and reflects the proportion of the free flowing phase which can be generated after the sample to be detected is sintered at high temperature. According to the high-temperature sintering data of the iron-containing minerals, detailed and accurate basic data can be provided for subsequent optimized ore blending.

In some embodiments of the present application, in the sintering step, the temperature rise rate of the second stage is: 80-120 ℃/min. The temperature is controlled according to the temperature rise curve, so that the sintering temperature can be ensured to be more fit with the actual condition in the high-temperature sintering process, and the accuracy of the measuring and calculating result is improved.

In some embodiments of the present application, before the pre-measuring step, a pre-baking step is further included, and the pre-baking step includes pre-baking the sample to be measured in an environment at 900-1100 ℃ for 10-30 min. The roasting atmosphere is set as a sintering waste gas component, no liquid phase is generated at the temperature of 900-1100 ℃, the decomposition and solid phase reaction of crystal water and carbonate occur at the moment, and the solid phase reaction is slow, so the influence of the heating time and the temperature rise rate on the solid phase reaction is small, the pre-roasting can remove the burning loss of materials and preliminarily form the strength, and the measurement work is convenient.

The embodiment of the application also provides an iron-containing mineral sintering device, which is used for sintering the sample 3 to be sintered.

Fig. 4 is a schematic structural diagram of an iron-containing mineral sintering apparatus according to an embodiment of the present application. The iron ore sintering equipment comprises a heating device 6, a gas supply device 7, a sample injection device 8 and a control device 9. The heating device 6 includes a heating furnace 601 and a heating pipe 602 disposed in the heating furnace 601. The gas supply device 7 communicates with the inside of the heating furnace 601 and is used for supplying sintering gas. The gas supply device 7 communicates with the heating furnace 601 through a pipe 701, and introduces a simulated sintering atmosphere into the heating furnace 601. The sample injection device 8 comprises a push rod 801, a motor 802 and a temperature sensor 803. The push rod 801 is electrically connected to the motor 802, and the temperature sensor 803 is provided on the push rod 801. The heat-resistant container 1 is provided on the push rod 801.

The control device 9 is electrically connected to the heating pipe 602, the gas supply device 7, and the motor 802. The control device 9 can notify the movement of the motor 802 to control the heat-resistant container 1 to enter and exit the heating furnace 601. The control device 9 is connected to the heating pipe 602 for controlling the heating rate and time of the heating pipe 602. While the control device 9 may be connected to the temperature sensor 803 to obtain the real-time temperature of the heat-resistant container 1. The control device 9 is also connected to an in-furnace temperature sensor 901, and the in-furnace temperature sensor 901 is provided in the heating furnace 601 to acquire a real-time temperature condition of the heating furnace 601.

In some embodiments of the present application, the end of the push rod 801 near the heating furnace 601 is provided with a fixing member for fixing the heat-resistant container 1. Fixing the heat-resistant container 1 to one end of the push rod 801 can ensure the stability of the movement of the push rod 801 driving the heat-resistant container 1.

In some embodiments of the present application, a display device 10 is further included, the display device 10 is electrically connected to the control device 9, and the display device 10 can display the real-time temperature condition in the heating furnace 601, so as to facilitate the analysis and recording of the high-temperature sintering condition.

The present invention will be described in detail with reference to specific examples.

Comparative example

Taking a typical magnetite concentrate and a limonite powder ore as examples, the high-temperature sintering performance data of the iron ore at different temperatures are measured. Magnetite a and limonite B were selected for the study. The specific composition of the iron-containing minerals is shown in table 1.

TABLE 1

Mine species	TFe	FeO	SiO2	CaO	MgO	Al2O3	LOI
								Magnetite A	63.99	29.47	5.30	1.79	0.58	0.19	1.61
Limonite B	65.82	1.54	1.40	0.09	0.06	1.30	3.01

The sintering properties of the two iron-containing minerals were tested by the prior art method and the results are shown in table 2.

TABLE 2

Mine species	Test items	Test results
			Magnetite A	Temperature at which liquid phase starts to form	1280.0
	Complete liquid phase formation temperature	1287.5
				Free flow temperature of liquid phase	1349.0
	Liquid phase formation at 1300 deg.C	70.45
			Limonite B	Temperature at which liquid phase starts to form	1254.0
	Complete liquid phase formation temperature	1266.5
				Free flow temperature of liquid phase	1281.0
	Liquid phase formation at 1300 deg.C	77.83

The test result of the comparative example shows that the generation amount and the fluidity of the liquid phase are represented by temperature rather than content, the use is inconvenient, and the addition of a fusing agent and other substances and the temperature control link of high-temperature sintering cannot be effectively guided in the later optimized ore blending scheme.

Example one

In this embodiment, the method for measuring and calculating the high-temperature sintering performance of the iron-containing mineral disclosed by the present application is used to measure and calculate the sintering performance of the iron-containing mineral.

This example was also studied using magnetite A and limonite B, the specific compositions of which are given in Table 1.

First, the thermodynamic calculation software factsage7.0 was used to calculate the two free-flowing liquid phase formations at different temperatures for the two ores, and the results are shown in fig. 5. Theoretical calculations give the amount of free flowing liquid phase formed and figure 5 shows that the higher the temperature, the better the liquid phase fluidity.

The following is a data on the sintering properties of the iron-containing minerals performed according to the method in the examples of the present application. Firstly, carrying out a pretreatment step, and screening magnetite A to be detected, limonite B and a flux to obtain micro mineral powder with the particle size of 0-0.5 mm; taking a flux, and uniformly mixing the micro mineral powder and the flux to obtain a mixture; adding 7-10% of water by mass into the mixture, and maintaining the pressure for 1-5 min under the pressure of 5-30 MPa for forming to obtain a sample to be measured. And then carrying out a pre-roasting step, wherein the pre-roasting step comprises the step of placing the sample to be tested in an environment of 900-1100 ℃ for pre-roasting for 10-30 min. The firing atmosphere is set to be a sintering exhaust gas component.

Then, a pre-measurement step was performed, which included taking the heat-resistant container 1 and the heat-resistant sample holder 2, and measuring the mass M1 of the heat-resistant container and the volume V1 of the heat-resistant container, measuring the volume V2 of the heat-resistant sample holder, and measuring the mass M3 of the sample to be sintered and the volume V3 of the sample to be sintered.

Then sintering step is carried out, and CO with the volume content of 20-24 percent is introduced₂And 75-80% by volumeN₂Simulating a sintering combustion atmosphere, and sintering a sample to be sintered in two stages in sequence, wherein the first stage comprises the following steps: sintering temperature is 1000-1200 ℃, sintering time is 3-8 minutes, and the second stage is as follows: adjusting the temperature rising speed according to the temperature rising curve, rising the temperature to 1300-1500 ℃, sintering for 3-5 minutes, and rapidly cooling to room temperature after completion; wherein the temperature rise rate in the second stage is as follows: 80-120 ℃/min.

Then, a measuring step, namely obtaining a free flowing part bonded with the heat-resistant container and a sintering residual part remained on the heat-resistant sample seat after the sintering of the sintered sample is finished and cooled, wherein the combination of the free flowing part and the heat-resistant container is a first measuring body 4, and the sintering residual part and the heat-resistant sample seat are a second measuring body 5; the heat-resistant sample holder was separated from the heat-resistant container to separate the first measuring body and the second measuring body, and the mass M4 of the first measuring body and the volume V4 of the first measuring body were measured, and the volume V5 of the second measuring body was measured.

And a calculating step, calculating high-temperature sintering performance data in the mineral sintering process according to the mass of the sample to be sintered before and after high-temperature sintering, the volume variation and the volume-mass variation ratio.

Specifically, the high-temperature sintering performance data comprises the volume shrinkage Lt of the agglomerates and the free-flowing liquid phase ratio Lf, and the calculation formula is as follows:

Lt＝(V2+V3-V5)/V3×100％；

Lf＝(M4-M1)/M3×100％。

the two iron-containing minerals are measured and calculated by the method for measuring and calculating the high-temperature sintering performance of the iron-containing minerals, and the results are shown in table 2. As can be seen from table 2, as the temperature increases, the total liquid phase generation ratio Lt increases, and the free-flowing liquid phase ratio Lf also increases, which is consistent with the above theoretical calculation results, and indicates that the test method in the present application is accurate and effective.

Comparing the two different ores, it can be seen that limonite B has better liquid phase forming ability than magnetite a.

TABLE 2

The testing method is closer to theoretical calculation results and actual production results, and the influence of the heating rate, the heating temperature and the combustion atmosphere on the sintering performance is considered.

In accordance with the embodiments of the present application as described above, these embodiments are not exhaustive and do not limit the application to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and its practical application, to thereby enable others skilled in the art to best utilize the application and its various modifications as are suited to the particular use contemplated. The application is limited only by the claims and their full scope and equivalents.