阅读说明：本技术 一种含碳有机物材料用于铁矿石烧结的方法 (Method for sintering iron ore by using carbon-containing organic material ) 是由 张建良 刘征建 王桂林 王耀祖 于 2021-08-31 设计创作，主要内容包括：本发明公开一种含碳有机物材料用于铁矿石烧结的方法,属于钢铁冶炼的技术领域。所述方法包括如下步骤：S1：将含碳有机物材料处理成颗粒材料或炭黑材料；S2：将步骤S1中的颗粒材料或炭黑材料与原料、熔剂及辅助燃料进行搅拌混合和强化制粒,获得烧结混合料；S3：将烧结混合料进行烧结,获得炼铁用烧结矿。本发明的方法能够实现烧结经济技术指标的大幅度改善和烧结固体燃耗的有效降低,同时实现烧结矿的质量大幅度提升,所生产烧结矿的还原性、低温还原粉化性能和软熔性能均符合高炉入炉要求；具有非常好的经济效益和环境效益,利于工业大规模生产和推广。(The invention discloses a method for sintering iron ore by using a carbon-containing organic material, belonging to the technical field of iron and steel smelting. The method comprises the following steps: s1: processing the carbon-containing organic material into a granular material or a carbon black material; s2: stirring and mixing the granular material or the carbon black material obtained in the step S1 with the raw material, the flux and the auxiliary fuel, and performing reinforced granulation to obtain a sintering mixture; s3: sintering the sintering mixture to obtain the sinter for ironmaking. The method can greatly improve the sintering economic and technical indexes and effectively reduce the sintering solid fuel consumption, and simultaneously greatly improve the quality of the sintered ore, and the reducibility, the low-temperature reduction degradation performance and the soft melting performance of the produced sintered ore all meet the requirement of charging the blast furnace; has good economic benefit and environmental benefit, and is beneficial to industrial large-scale production and popularization.)

1. A method of using a carbonaceous organic material for iron ore sintering, the method comprising the steps of:

s1: processing the carbon-containing organic material into a granular material or a carbon black material;

s2: stirring and mixing the granular material or the carbon black material obtained in the step S1 with the raw material, the flux and the auxiliary fuel, and performing reinforced granulation to obtain a sintering mixture;

s3: sintering the sintering mixture to obtain the sinter for ironmaking.

2. The method of using carbonaceous organic material for iron ore sintering according to claim 1,

in step S2, the method specifically includes the following steps: weighing the granular material or the carbon black material in the step S1, conveying the granular material or the carbon black material into a sintering-mixing roller, and stirring and mixing the granular material or the carbon black material with the raw material, the flux and the auxiliary fuel to obtain a mixture I; conveying the formed mixture I to a sintering and mixing roller II for reinforced granulation to obtain a mixture II;

in step S3, the method specifically includes the following steps:

s31: conveying the mixture II in the step S2 to a mixing bin, and paving the mixture II on a sintering trolley;

s32: and igniting the upper layer of the mixture II paved in the sintering trolley in the step S31, controlling the negative pressure at the bottom of the sintering trolley, and adjusting and controlling parameters such as sintering air quantity, machine speed, sintering end point and the like to obtain the sinter for blast furnace iron making.

3. The method for iron ore sintering of carbonaceous organic material according to claim 2, wherein the particle size of the particulate material in step S1 is less than 3 mm.

4. The method for iron ore sintering of carbonaceous organic material according to claim 2, wherein the processing of the carbonaceous organic material into particulate material in step S1 includes two of:

the first method comprises the following steps: compressing the collected carbon-containing organic material to form a cake, and then adding the cake to a cutting process to form;

and the second method comprises the following steps: and directly cutting the collected carbon-containing organic material to form the carbon-containing organic material.

5. The method for iron ore sintering of carbon-containing organic material as claimed in claim 2, wherein the carbon black material in step S1 is high calorific value carbon black material formed by charging the particulate material into a carbonization apparatus at 100-900 ℃.

6. The method for iron ore sintering of carbonaceous organic material according to claim 2, wherein the carbonaceous organic material in step S1 comprises at least two of crops, crop wastes, wood wastes, animal wastes, various plastics, tires, and snake skin bags.

7. The method for iron ore sintering of carbonaceous organic material according to claim 2, wherein the raw material in the step S2 is iron ore, the flux is quicklime, limestone or dolomite, and the auxiliary fuel is coke powder or coal powder.

8. The method for iron ore sintering of carbon-containing organic material as claimed in claim 2, wherein the thickness of the layer laid by the two-material mixture material in step S31 is 600-1000 mm.

9. The method for iron ore sintering of carbon-containing organic materials as claimed in claim 2, wherein a layer of sintered return ores with a grain size of 10-25mm is laid at the bottom of the sintering trolley in the step S31 as a bedding material, and a second mixture is laid at the upper layer.

10. The method for iron ore sintering of carbon-containing organic material according to claim 2, wherein the ignition process parameters in step S32 are: the ignition time is 58-62s, the ignition vacuum degree is 4-6kpa, and the ignition depth is 10-20 mm.

Technical Field

The invention belongs to the technical field of iron and steel smelting, and relates to a method for sintering iron ore by using a carbon-containing organic material.

Background

Sintered ore is used as a main raw material of a blast furnace,the average charging proportion is about 75 percent, and the method is an important component of the steel smelting industry in China. The yield of the sintered ore in China is huge every year, the sintering process consumes coke and coal resources greatly, and in the face of the current 'double-carbon' strategy, the sintering production process reduces the consumption of solid fuel, reduces the utilization of the coal resources and promotes SO₂、NOx、CO₂The emission reduction is significant.

The carbon-containing organic material is used as an important component of renewable energy, the value of the carbon-containing organic material is efficiently developed and utilized, the carbon-containing organic material plays a very positive role in solving the problems of energy, ecological environment and the like, and China is used as a big agricultural country to generate a large amount of agricultural byproducts, such as corn stalks, cotton stalks, rice husks and the like, every year, wherein the rice husk is rich in resources, the annual output is about 4000 ten thousand tons, and the rice husk accounts for about 20 percent of the mass of rice. Because of low nutritive value, most of the rice hulls are incinerated, which not only causes air pollution, but also greatly wastes resources and is not beneficial to sustainable development. For the carbon-containing organic material, the fixed carbon can be collected by modes such as carbonization and the like, and the carbon-containing organic material can be used as a fuel for sintering iron ore, so that the dependence and consumption on coal resources are reduced.

Patent CN 102839280 a discloses a fuel selective distribution granulation method for strengthening the sintering of biomass energy iron ore, which distributes biomass fuel in the core of the mixture before sintering through two-stage granulation to properly reduce the combustion speed of the biomass fuel and improve the combustion degree of the biomass fuel, thereby achieving the purpose of strengthening the sintering of biomass energy. The granulation method is complex in granulation mode, the granulation structure and the combustion speed need to be controlled specially, the operation difficulty is high, and the method is not beneficial to industrial large-scale production and popularization.

Patent CN 109135861 a discloses a method for preparing biomass charcoal coated fuel for iron ore sintering, which needs to measure intrinsic reaction kinetic parameters of combustion reaction between biomass charcoal and coke and oxygen respectively, then divide the biomass charcoal into a plurality of particle size groups according to the measured intrinsic reaction kinetic parameters, and calculate structural parameters of a coating layer formed around the biomass charcoal of each particle size group. Not only the calculated amount is large, but also the calculated result and the coating result have deviation, and the structure control difficulty is large.

In summary, the selection of replacing the traditional fuel in the sintered ore at the present stage is realized by preparing coke and a coal coating layer on the surface of the biomass charcoal, and the granulation preparation operation of the fuel with the core-shell structure is complex, the structure control difficulty is large, and the industrial large-scale production and popularization are not facilitated, so that a process method which is simple in process, can effectively improve the yield, can effectively utilize the carbon-containing organic material, and can greatly reduce the fuel consumption of the traditional fuel in the preparation process of the iron ore sintered ore is urgently needed.

Disclosure of Invention

The invention solves the technical problems that the operation difficulty of replacing the traditional fuel in the sinter in the prior stage and putting the traditional fuel into the granulation preparation is high, the structure of the prepared fuel is difficult to control, the mode of using the fuel in the iron ore sinter cannot fully utilize the performance of the fuel, the replacement rate is low, and the industrial large-scale production and popularization are not facilitated.

In order to solve the technical problems, the invention provides the following technical scheme:

a method of using a carbonaceous organic material for iron ore sintering, the method comprising the steps of:

s1: processing the carbon-containing organic material into a granular material or a carbon black material;

s2: stirring and mixing the granular material or the carbon black material obtained in the step S1 with the raw material, the flux and the auxiliary fuel, and performing reinforced granulation to obtain a sintering mixture;

s3: sintering the sintering mixture to obtain the sinter for ironmaking.

Preferably, the step S2 specifically includes the following steps: weighing the granular material or the carbon black material in the step S1, conveying the granular material or the carbon black material into a sintering-mixing roller, and stirring and mixing the granular material or the carbon black material with the raw material, the flux and the auxiliary fuel to obtain a mixture I; conveying the formed mixture I to a sintering and mixing roller II for reinforced granulation to obtain a mixture II;

in step S3, the method specifically includes the following steps:

s31: conveying the mixture II in the step S2 to a mixing bin, and paving the mixture II on a sintering trolley;

s32: and igniting the upper layer of the mixture II paved in the sintering trolley in the step S31, controlling the negative pressure at the bottom of the sintering trolley, and adjusting and controlling parameters such as sintering air quantity, machine speed, sintering end point and the like to obtain the sinter for blast furnace iron making.

Preferably, the particle size of the particulate material in said step S1 is less than 3 mm.

Preferably, the processing of the carbon-containing organic material into the particulate material in the step S1 includes the following two types:

the first method comprises the following steps: compressing the collected carbon-containing organic material to form a cake, and then adding the cake to a cutting process to form;

and the second method comprises the following steps: and directly cutting the collected carbon-containing organic material to form the carbon-containing organic material.

Preferably, the carbon black material in step S1 is a high-calorific-value carbon black material formed by adding the particulate material into a carbonization device at 100-900 ℃ for carbonization.

Preferably, the carbon-containing organic material in step S1 includes at least two of crops, crop wastes, wood wastes, animal wastes, various plastics, tires, and snake skin bags.

Preferably, the raw material in the step S2 is iron ore, the flux is quicklime, limestone or dolomite, and the auxiliary fuel is coke powder or coal powder.

Preferably, the thickness of the material layer for laying the mixture two cloth in the step S31 is 600-1000 mm.

Preferably, in the step S31, a layer of sintered return ores with the grain size of 10-25mm is paved at the bottom in the trolley of the sintering trolley as a bedding material, and a second mixture is paved at the upper layer.

Preferably, the ignition process parameters in step S32 are: the ignition time is 58-62s, the ignition vacuum degree is 4-6kpa, and the ignition depth is 10-20 mm.

The technical scheme provided by the embodiment of the invention at least has the following beneficial effects:

in the scheme, the method for sintering the iron ore by using the carbon-containing organic material takes the carbon-containing organic materials such as crops or wood and the like as main fuel, the iron ore as raw material, coke powder or coal powder as auxiliary fuel, quicklime, limestone or dolomite and the like as fusing agent, thereby realizing the sintering of the iron ore in the field of iron making.

The method can greatly improve the sintering economic and technical indexes and effectively reduce the sintering solid fuel consumption, and simultaneously greatly improve the quality of the sintered ore, and the reducibility, the low-temperature reduction degradation performance and the soft melting performance of the produced sintered ore all meet the requirement of charging the blast furnace; has good economic benefit and environmental benefit, and is beneficial to industrial large-scale production and popularization.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a process flow diagram of a method of using a carbonaceous organic material for iron ore sintering according to the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in figure 1, the carbon-containing organic material is prepared from corn stalks, cotton stalks and rice stalks, wherein the corn stalks account for 40 wt%, the cotton stalks account for 30 wt% and the rice stalks account for 30 wt%, by directly pulverizing to less than 3mm, and then carbonizing at 800 deg.C for 0.5h to form the carbon black material.

The carbon black material is used as fuel, PB powder, Newman mineral powder, golden buba mineral powder and iron concentrate powder are used as iron ore, wherein the proportion of the carbon black material is 7 wt%, the proportion of the PB mineral powder is 15 wt%, the proportion of the Newman powder is 8 wt%, the proportion of the golden buba mineral powder is 8 wt%, the proportion of the iron concentrate powder is 3 wt%, and the balance of other iron-containing raw materials, fuel and flux are used.

Conveying the carbon black material to a sintering first mixing roller by wind power for mixing for 3min, conveying the rest materials to the sintering first mixing roller by a belt, adding 7.5 wt% of water, stirring and mixing to obtain a first mixture, conveying the first mixture to a sintering second mixing roller for reinforced granulation to obtain a second mixture, and mixing for 5 min. And then the mixture two is conveyed to a mixture bin through a belt.

Paving a layer of sintered return ores with the granularity of 10-25mm at the bottom of the sintering trolley as a bottom material, paving a second mixture on the upper layer to enable the thickness of the sintered layer to be 700mm, igniting the surface of the second mixture layer on the trolley, wherein the ignition time is usually 58 seconds, the ignition vacuum degree is 4-6kpa, and the ignition depth is 10-20 mm. The sintering air quantity is accurately controlled to be about 3300m per ton of sintering ore air quantity³The machine speed is controlled to be 1.5-4m/min, and finally, the sintered ore with the reducibility, the low-temperature reduction degradation performance and the soft melting performance meeting the requirement of the blast furnace is produced.

Example 2

As shown in figure 1, the carbon-containing organic material is prepared from walnut shells, waste plastic bags and waste tires, wherein the proportion of the walnut shells is 25 wt%, the proportion of the waste plastic bags is 30 wt% and the proportion of the waste tires is 45 wt%, the walnut shells, the waste plastic bags and the waste tires are compressed into cakes, the cakes are crushed to be less than 3mm, and the cakes are carbonized at 500 ℃ for 1.0 hour to form the carbon black material.

The carbon black material is used as fuel, coal powder, Brazilian Calomelas, PB powder, iron concentrate powder and the like are used as iron ore, wherein the proportion of the carbon black material is 4.8 wt%, the proportion of the coal powder is 1.3 wt%, the proportion of the Brazilian Calomelas is 30 wt%, the proportion of the PB powder is 10 wt%, the proportion of the iron concentrate powder is 8 wt%, and the balance is other iron-containing raw materials, fuel and flux.

Conveying the raw fuel to a sintering-mixing roller through a belt, and spraying 9.0 wt% of water for mixing and stirring to obtain a first mixture; and then conveying the first mixture to a second sintering mixing roller for mixing to obtain a second mixture, wherein the mixing time in the first sintering mixing roller is 3min, and the mixing time in the second sintering mixing roller is 3 min. And then the mixture two is conveyed to a mixture bin through a belt.

Paving a layer of sintered return ores with the granularity of 10-25mm at the bottom of the sintering trolley as a bedding material, paving a second mixture on the upper layer to ensure that the thickness of a material layer of the second mixture is 980mm, igniting the surface of the material layer of the second mixture on the trolley, wherein the ignition time is usually 60 seconds, the ignition vacuum degree is 4-6kpa, and the ignition depth is 10-20 mm. The sintering air quantity is accurately controlled to be about 3200m per ton of sintering ore air quantity³The machine speed is controlled to be 1.5-4m/min, and finally, the sintered ore with the reducibility, the low-temperature reduction degradation performance and the soft melting performance meeting the requirement of the blast furnace is produced.

Example 3

As shown in figure 1, the carbon-containing organic material is prepared from wheat straw 50 wt% and fallen dried branches 50 wt%, by compressing into cake, and pulverizing to powder of 2mm or less.

The crushed carbon-containing organic material is selected as fuel, and super-fine mineral powder, Mike powder, iron concentrate powder and the like are selected as iron ore, wherein the proportion of the carbon-containing organic material is 12 wt%, the proportion of the super-fine mineral powder is 14 wt%, the proportion of the Mike powder is 10 wt%, the proportion of the iron concentrate powder is 10 wt%, and the rest proportion is other iron-containing raw materials, fuel and flux.

Conveying the raw fuel to a sintering-mixing roller through a belt, and spraying 9.0 wt% of 73 ℃ hot water for mixing and stirring to obtain a first mixture; and then conveying the first mixture to a second sintering mixing roller for mixing to obtain a second mixture, wherein the mixing time in the first sintering mixing roller is 3min, and the mixing time in the second sintering mixing roller is 3 min. And then the mixture two is conveyed to a mixture bin through a belt.

Paving a layer of sintered return ores with the granularity of 10-25mm at the bottom of the sintering trolley as a bedding material, paving a second mixture on the upper layer to ensure that the thickness of a material layer of the second mixture is 800mm, igniting the surface of the material layer of the second mixture on the trolley, wherein the ignition time is usually 62 seconds, the ignition vacuum degree is 4-6kpa, and the ignition depth is 10-20 mm. The accurate control of the sintering air quantity is approximately 3100m for the air quantity required by each ton of sintering ore³The machine speed is controlled to be 1.5-4m/min, and the final output reducibility, low-temperature reduction pulverization performance and reflow performance all meet the requirement of charging into the blast furnaceAnd obtaining the sintered ore.

In the scheme, the method for sintering the iron ore by using the carbon-containing organic material takes the carbon-containing organic materials such as crops or wood and the like as main fuel, the iron ore as raw material, coke powder or coal powder as auxiliary fuel, quicklime, limestone or dolomite and the like as fusing agent, thereby realizing the sintering of the iron ore in the field of iron making.

The method can greatly improve the sintering economic and technical indexes and effectively reduce the sintering solid fuel consumption, and simultaneously greatly improve the quality of the sintered ore, and the reducibility, the low-temperature reduction degradation performance and the soft melting performance of the produced sintered ore all meet the requirement of charging the blast furnace; has good economic benefit and environmental benefit, and is beneficial to industrial large-scale production and popularization.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.