阅读说明：本技术 一种快速测量冶金球团还原膨胀率的方法 (Method for rapidly measuring reduction expansion rate of metallurgical pellets ) 是由 朱凤湘 胡鹏 唐文博 于秀芳 于 2019-10-08 设计创作，主要内容包括：本发明涉及冶金技术领域,公开了一种快速测量冶金球团还原膨胀率的方法。该方法包括以下步骤：测得18粒球团加入容器后,从容器中溢出细钢砂的质量为M1,然后对18粒球团进行膨胀还原实验,冷却至室温后,接着重复实验,测得从容器中溢出细钢砂的质量为M2,根据公式((M2-M1)/M1)*100计算出球团还原膨胀率。该方法通过细钢砂替代水或油酸钠测量球团体积,使得测量方法步骤简单、操作便捷并且准确度高,同时细钢砂可以重复使用。(The invention relates to the technical field of metallurgy and discloses a method for rapidly measuring the reduction expansion rate of metallurgical pellets. The method comprises the following steps: after the 18 pellets were charged into the vessel, the mass of the fine steel grit overflowing from the vessel was measured to be M1, and then the 18 pellets were subjected to the expansion reduction test, cooled to room temperature, and then the test was repeated to measure the mass of the fine steel grit overflowing from the vessel to be M2, and the reduction expansion ratio of the pellets was calculated according to the formula ((M2-M1)/M1) × 100. According to the method, the fine steel grit replaces water or sodium oleate to measure the volume of the pellets, so that the measuring method is simple in steps, convenient and fast to operate and high in accuracy, and meanwhile, the fine steel grit can be reused.)

1. A method for rapidly measuring the reduction expansion rate of metallurgical pellets is characterized by comprising the following steps:

(1) filling fine steel grit into a first container until the fine steel grit overflows;

(2) scraping off the excessive fine steel sand above the bottle mouth by using a steel plate ruler along the horizontal direction of the bottle mouth of the first container, only reserving the fine steel sand just filled in the first container, and then pouring the fine steel sand in the first container into a second container;

(3) filling the fine steel grit in the second container into the first container, and controlling the height of the fine steel grit to be 1/8-3/8 of the height of the first container;

(4) 6 pellets are filled into the first container, the 6 pellets are controlled not to be contacted with each other and not to be close to the wall of the container, then the fine steel sand in the second container is filled into the first container, so that the fine steel sand completely submerges the pellets, and the submerged thickness is controlled to be 18-22 mm;

(5) 6 pellets are filled into the first container, the 6 pellets are controlled not to be contacted with each other and not to be close to the wall of the container, then the fine steel sand in the second container is filled into the first container, so that the fine steel sand completely submerges the pellets, and the height of the fine steel sand is controlled to be 1/2-2/3 of the height of the first container;

(6) 6 pellets are filled into the first container, the 6 pellets are controlled not to be contacted with each other and not to be close to the wall of the container, and the residual fine steel sand in the second container is completely filled into the first container;

(7) scraping the excessive fine steel sand above the bottle mouth by using a steel plate ruler along the horizontal direction of the bottle mouth of the first container, only reserving the fine steel sand just filled with the first container, collecting the overflowing fine steel sand, weighing, and measuring the mass M1;

(8) taking out 18 pellets in the first container, performing a pellet expansion reduction experiment according to a national standard method, and cooling the pellets to room temperature;

(9) filling the fine steel grit left in the first container in the step (7) and the overflowing fine steel grit into the second container, and performing the experiment in the step (3-7) with the pellets cooled to room temperature in the step (8) to obtain the mass M2 of the overflowing fine steel grit;

(10) calculating the reduction expansion rate of the pellets by a formula of (M2-M1)/M1) 100;

wherein the particle size of the pellets is 10-12.5 mm.

2. The method for rapidly measuring the reduction expansion rate of metallurgical pellets according to claim 1, wherein the grain size of the fine steel grit is less than 0.05 mm.

3. The method for rapidly measuring the reduction expansion rate of metallurgical pellets according to claim 1, wherein in the step (3), the height of the fine steel grit is controlled to 1/4 of the height of the container.

4. The method for rapidly measuring the reduction expansion rate of metallurgical pellets according to claim 1, wherein in the step (4), the thickness of the fine steel grit submerged pellets is controlled to be 19-21 mm.

5. The method for rapidly measuring the reduction expansion rate of metallurgical pellets according to claim 1, wherein in the step (5), the height of the fine steel grit is controlled to 2/3 of the height of the container.

6. The method for rapidly measuring the reduction expansion rate of metallurgical pellets according to claim 1, wherein in the step (8), the pellet expansion reduction experiment is carried out according to the method of the national standard GB/T13240-1991.

7. The method for rapidly measuring the reduction expansion rate of metallurgical pellets according to claim 7, wherein the volume of the second container is larger than the volume of the first container.

8. The method for rapid measurement of the reduction expansion rate of metallurgical pellets according to claim 1 or 7, wherein the first container is a flat mouth beaker.

9. The method for rapidly measuring the reduction expansion rate of metallurgical pellets according to claim 1, wherein the fine steel grit is uniformly distributed in the container through a glass funnel.

Technical Field

The invention relates to the technical field of metallurgy, in particular to a method for rapidly measuring the reduction expansion rate of metallurgical pellets.

Background

The reduction expansion index of metallurgical pellets is one of important indexes for judging the performance of the pellets, and at present, the detection method of the national standard mainly detects the performance of the pellets by a water immersion method and an oil immersion method. Although the pellet expansion index detected by the water immersion method and the oil immersion method has accurate results and small errors, the detection steps are complicated, the time consumption is long, and the efficiency is low.

Disclosure of Invention

The invention aims to solve the problems of complicated detection steps, long time consumption and low efficiency in the prior art, and provides a method for rapidly measuring the reduction expansion rate of metallurgical pellets.

In order to achieve the above object, the present invention provides a method for rapidly measuring the reduction expansion rate of metallurgical pellets, comprising the steps of:

(1) filling fine steel grit into a first container until the fine steel grit overflows;

(2) scraping off the excessive fine steel sand above the bottle mouth by using a steel plate ruler along the horizontal direction of the bottle mouth of the first container, only reserving the fine steel sand just filled in the first container, and then pouring the fine steel sand in the first container into a second container;

(3) filling the fine steel grit in the second container into the first container, and controlling the height of the fine steel grit to be 1/8-3/8 of the height of the first container;

(4) 6 pellets are filled into the first container, the 6 pellets are controlled not to be contacted with each other and not to be close to the wall of the container, then the fine steel sand in the second container is filled into the first container, so that the fine steel sand completely submerges the pellets, and the submerged thickness is controlled to be 18-22 mm;

(5) 6 pellets are filled into the first container, the 6 pellets are controlled not to be contacted with each other and not to be close to the wall of the container, then the fine steel sand in the second container is filled into the first container, so that the fine steel sand completely submerges the pellets, and the height of the fine steel sand is controlled to be 1/2-2/3 of the height of the first container;

(6) 6 pellets are filled into the first container, the 6 pellets are controlled not to be contacted with each other and not to be close to the wall of the container, and the residual fine steel sand in the second container is completely filled into the first container;

(7) scraping the excessive fine steel sand above the bottle mouth by using a steel plate ruler along the horizontal direction of the bottle mouth of the first container, only reserving the fine steel sand just filled with the first container, collecting the overflowing fine steel sand, weighing, and measuring the mass M1;

(8) taking out 18 pellets in the first container, performing a pellet expansion reduction experiment according to a national standard method, and cooling the pellets to room temperature;

(9) filling the fine steel grit left in the first container in the step (7) and the overflowing fine steel grit into the second container, and performing the experiment in the step (3-7) with the pellets cooled to room temperature in the step (8) to obtain the mass M2 of the overflowing fine steel grit;

(10) calculating the reduction expansion rate of the pellets by a formula of (M2-M1)/M1) 100;

wherein the particle size of the pellets is 10-12.5 mm.

Preferably, the fine steel grit has a particle size of 0.05mm or less.

Preferably, in the step (3), the height of the fine steel grit is controlled to 1/4 of the height of the container.

Preferably, in the step (4), the thickness of the fine steel grit passing through the pellets is controlled to be 19-21 mm.

Preferably, in the step (5), the height of the fine steel grit is controlled to 2/3 of the height of the container.

Preferably, in the step (8), the pellet expansion reduction experiment is carried out according to the method of the national standard GB/T13240-1991.

Preferably, the volume of the second container is greater than the volume of the first container.

Preferably, the first container is a plain-end, spout-less beaker.

Preferably, the fine steel grit is uniformly distributed in the container through a glass funnel.

According to the method for rapidly measuring the reduction expansion rate of the metallurgical pellets, the volume of the pellets is measured by replacing water or sodium oleate with fine steel grit, and the reduction expansion rate of the pellets is calculated, so that the measuring method is simple in step, convenient to operate and high in accuracy, and meanwhile, the fine steel grit can be reused.

Detailed Description

The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

The invention provides a method for rapidly measuring the reduction expansion rate of metallurgical pellets, which comprises the following steps:

(1) filling fine steel grit into a first container until the fine steel grit overflows;

(2) scraping off the excessive fine steel sand above the bottle mouth by using a steel plate ruler along the horizontal direction of the bottle mouth of the first container, only reserving the fine steel sand just filled in the first container, and then pouring the fine steel sand in the first container into a second container;

(3) filling the fine steel grit in the second container into the first container, and controlling the height of the fine steel grit to be 1/8-3/8 of the height of the first container;

(4) 6 pellets are filled into the first container, the 6 pellets are controlled not to be contacted with each other and not to be close to the wall of the container, then the fine steel sand in the second container is filled into the first container, so that the fine steel sand completely submerges the pellets, and the submerged thickness is controlled to be 18-22 mm;

(5) 6 pellets are filled into the first container, the 6 pellets are controlled not to be contacted with each other and not to be close to the wall of the container, then the fine steel sand in the second container is filled into the first container, so that the fine steel sand completely submerges the pellets, and the height of the fine steel sand is controlled to be 1/2-2/3 of the height of the first container;

(6) 6 pellets are filled into the first container, the 6 pellets are controlled not to be contacted with each other and not to be close to the wall of the container, and the residual fine steel sand in the second container is completely filled into the first container;

(7) scraping the excessive fine steel sand above the bottle mouth by using a steel plate ruler along the horizontal direction of the bottle mouth of the first container, only reserving the fine steel sand just filled with the first container, collecting the overflowing fine steel sand, weighing, and measuring the mass M1;

(8) taking out 18 pellets in the first container, performing a pellet expansion reduction experiment according to a national standard method, and cooling the pellets to room temperature;

(9) filling the fine steel grit left in the first container in the step (7) and the overflowing fine steel grit into the second container, and performing the experiment in the step (3-7) with the pellets cooled to room temperature in the step (8) to obtain the mass M2 of the overflowing fine steel grit;

(10) calculating the reduction expansion rate of the pellets by a formula of (M2-M1)/M1) 100;

wherein the particle size of the pellets is 10-12.5 mm.

In the method of the present invention, in the step (9), the fine steel grit left in the first container in the step (7) and the overflowing fine steel grit are filled into the second container, and the experiment of the step (3-7) is performed on the pellets cooled to room temperature in the step (8), which means that the total mass of the fine steel grit in the second container is the same when the experiment of the step (3-7) is performed twice.

Preferably, the fine steel grit has a particle size of 0.05mm or less. The fine steel grit with good fluidity is selected, so that the steel grit can fully fill gaps among the pellets during measurement, the steel grit is not adsorbed on the pellets, and the volume of the pellets can be accurately measured.

Preferably, the pellet size is selected according to the method described in national standard GB/T13240-1991.

Preferably, in the step (3), the height of the fine steel grit is controlled to 1/4 of the height of the container.

Preferably, in the step (4), the thickness of the fine steel grit passing through the pellets is controlled to be 19-21 mm. Specifically, it may be, for example, 19mm, 20mm or 21 mm.

Preferably, in the step (5), the height of the fine steel grit is controlled to 2/3 of the height of the container.

Preferably, in step (8), the pellet swelling reduction test is carried out according to the method described in the national standard GB/T13240-1991.

Preferably, the volume of the second container is greater than the volume of the first container. In a specific embodiment, the first container has a volume of 150mL and the second container has a volume of 200 mL.

In the method of the present invention, the choice of the second container is not particularly limited and may be a conventional choice in the art. In a specific embodiment, the second container is a beaker.

Preferably, the first container is a plain-end, spout-less beaker.

Preferably, the fine steel grit is uniformly distributed in the container through a glass funnel.

In the method of the present invention, there is no particular limitation on the means for weighing the mass of the overflowing fine steel grit, and it may be a conventional choice in the art. In a specific embodiment, the weighing is performed using a high precision electronic balance.

According to the method for rapidly measuring the reduction expansion rate of the metallurgical pellets, the volume of the pellets is measured by replacing water or sodium oleate with fine steel grit, and the reduction expansion rate of the pellets is calculated, so that the measuring method is simple in step, convenient to operate and high in accuracy, and meanwhile, the fine steel grit can be reused.

The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.

The following examples 1-3 and reference examples 1-3 used three different metallurgical pellets, namely a first metallurgical pellet, a second metallurgical pellet and a third metallurgical pellet, which were screened by the method described in the national standard GB/T13240-1991, and the particle size of the screened pellets was 10-12.5 mm.