Application method for adding waste slag ore in vanadium-titanium pellet production

Abstract

An application method for adding waste slag ore in vanadium-titanium pellet production relates to the technical field of environmental protection, and is characterized in that a first test refers to research on influence of waste slag ore adding on pellet quality in a sintering cup laboratory, and a second test refers to an industrial test for adding waste slag ore in a shaft furnace. According to the application method for adding the waste slag ore in the vanadium-titanium pellet production, 1% of the waste slag ore is added in the shaft furnace finally, the waste slag ore contains 1.5% of vanadium, the vanadium input is increased, and the metallurgical performance of the pellets is improved by adding the waste slag ore (the return rate of the pellets is reduced by 0.03%; the reduction performance is improved by 13.45%, the expansion index is reduced by 2.8%, the softening and melting interval is increased by 18.5 DEG C, and the dripping temperature is increased by 9 DEG C), the improvement of the reduction performance, the reduction of the expansion index and the increase of the dripping temperature are all beneficial to the metallurgical performance of the pellets, meanwhile, the waste slag ore is increased in the shaft furnace, the vanadium input is increased, the pig iron raw material cost is reduced, and the molten iron cost is reduced by 0.54 yuan / ton.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to an application method of adding waste slag ore in the production of vanadium-titanium pellets. Background Art

[0002] Vanadium-titanium slag is the solid waste left after extracting vanadium and titanium from some vanadium- and titanium-containing minerals such as vanadium-titanium magnetite and ferro-titanium ore. In addition to being rich in titanium dioxide and vanadium dioxide, these slags also contain other impurity elements. The treatment of vanadium-titanium slag has become an important issue in the vanadium-titanium industry. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an application method for adding abandoned slag ore in vanadium-titanium pellet production, which aims to optimize ore blending, increase vanadium-titanium resource input, improve pellet quality, increase vanadium product output, reduce raw material costs and improve efficiency. The effects of increasing the vanadium-titanium content in pellet production quality and metallurgical properties, and the effects of different raw material particle size compositions on shaft furnace production are studied. At the same time, the effects of increased titanium load on blast furnace production are studied. A series of experimental studies and process improvements are carried out in combination with the status of recoverable resources and the level of existing process equipment.

[0004] Abandoned slag is clinker with coarse particle size, small specific surface area, poor adhesion and overall poor balling performance. By studying the influence of different particle size compositions on vertical furnace production and balling process experiments, it is planned to use abandoned slag to replace Chengde iron powder for experimental research and production application, and explore the balling roasting technology of abandoned slag.

[0005] In order to solve the problems existing in the background technology, the present invention adopts the following technical scheme: including two research tests, the first test is a sintering cup laboratory study on the effect of adding waste slag on the quality of pellets, and the second test is an industrial test of adding waste slag in a vertical furnace; the two test steps are as follows: Experiment 1: Sintering cup laboratory studies the effect of waste slag addition on pellet quality: (1) The effects and rules of increasing the proportion of waste slag from 0% to 0.5-1.5% on the drop strength, compressive strength, compressive strength and high-temperature metallurgical properties (reducibility, reduction expansion and soft-melt dripping properties) of green balls were studied by using a pelletizing plate and roasting furnace in the laboratory. (2) In the experiment, we explored and adjusted the angle and rotation speed of the pelletizing disk, the roasting temperature and roasting time of the roasting furnace, so as to obtain pellets that meet the needs of the blast furnace and provide a basis for industrial production.

[0006] Test 2: Industrial test of vertical furnace with waste slag: (1) Increase the amount of steel balls put into the grinding machine during industrial production, increase the grinding operation current to more than 50A, and adjust the ball plate angle to 40 to 50 degrees; (2) Use hot water pelletizing and ceramic scraper related measures, add 1% waste slag ore, achieve the test objectives, and determine the control range of vertical furnace production process parameters: combustion chamber temperature 1030 ~ 1080 ° C, drying bed temperature 450 ~ 550 ° C; (3) The pellet return rate is reduced by 0.02-0.04%, the reducibility is increased by 12-14%, the expansion index is reduced by 2-3%, the soft melting range is increased by 17-20°C, and the dripping temperature is increased by 7-10°C. The improvement of reducibility, the reduction of expansion index and the increase of dripping temperature are all beneficial to the metallurgical properties of pellets. (4) Abandoned slag is added during vertical furnace production.

[0007] The beneficial effects of the present invention are as follows: the addition of 1% of the waste slag ore in the vertical furnace is finally achieved, the waste slag ore contains 1.5% vanadium, and the vanadium input is increased; the addition of the waste slag ore improves the metallurgical performance of the pellets (the pellet return rate is reduced by 0.03%; the reducibility is increased by 13.45%, the expansion index is reduced by 2.8%, the soft melting range is increased by 18.5°C, and the dripping temperature is increased by 9°C). The improvement of reducibility, the reduction of the expansion index, and the increase of the dripping temperature are all beneficial to the metallurgical performance of the pellets. At the same time, the increase of the waste slag ore in the vertical furnace increases the vanadium input, reduces the cost of pig iron raw materials, and reduces the cost of molten iron by 0.54 yuan / ton. DETAILED DESCRIPTION

[0008] The present invention specifically adopts the following implementation mode: it includes two research tests, the first test is a sintering cup laboratory study on the effect of adding waste slag ore on the quality of pellets, and the second test is an industrial test of adding waste slag ore to a shaft furnace; the two test steps are respectively as follows: Experiment 1: Sintering cup laboratory studies the effect of waste slag addition on pellet quality: (1) The effects and rules of increasing the proportion of waste slag from 0% to 0.5-1.5% on the drop strength, compressive strength, compressive strength and high-temperature metallurgical properties (reducibility, reduction expansion and soft-melt dripping properties) of green balls were studied by using a pelletizing plate and roasting furnace in the laboratory. (2) In the experiment, we explored and adjusted the angle and rotation speed of the pelletizing disk, the roasting temperature and roasting time of the roasting furnace, so as to obtain pellets that meet the needs of the blast furnace and provide a basis for industrial production.

[0009] Test 2: Industrial test of vertical furnace with waste slag: (1) Increase the amount of steel balls put into the grinding machine during industrial production, increase the grinding operation current to more than 50A, and adjust the ball plate angle to 40 to 50 degrees; (2) Use hot water pelletizing and ceramic scraper related measures, add 1% waste slag ore, achieve the test objectives, and determine the control range of vertical furnace production process parameters: combustion chamber temperature 1030 ~ 1080 ° C, drying bed temperature 450 ~ 550 ° C; (3) The pellet return rate is reduced by 0.02-0.04%, the reducibility is increased by 12-14%, the expansion index is reduced by 2-3%, the soft melting range is increased by 17-20°C, and the dripping temperature is increased by 7-10°C. The improvement of reducibility, the reduction of expansion index and the increase of dripping temperature are all beneficial to the metallurgical properties of pellets. (4) Abandoned slag is added during vertical furnace production.

[0010] Different numerical values ​​are used to carry out the test, which is embodied by the following embodiments: Example

[0011] There are two kinds of research tests. Test 1 is a sintering cup laboratory study on the effect of adding waste slag on the quality of pellets. Test 2 is an industrial test of adding waste slag to a shaft furnace. The steps of the two tests are as follows: Experiment 1: Sintering cup laboratory studies the effect of waste slag addition on pellet quality: (1) The effects of increasing the ratio of waste slag from 0% to 0.5 on the drop strength, compressive strength, compressive strength and high-temperature metallurgical properties (reducibility, reduction expansion and soft-melt dripping properties) of green balls were studied by using a pelletizing plate and roasting furnace in the laboratory. (2) In the experiment, we explored and adjusted the angle and rotation speed of the pelletizing disk, the roasting temperature and roasting time of the roasting furnace, so as to obtain pellets that meet the needs of the blast furnace and provide a basis for industrial production.

[0012] Test 2: Industrial test of vertical furnace with waste slag: (1) Increase the amount of steel balls put into the grinding machine during industrial production, increase the grinding operation current to more than 50A, and adjust the ball plate angle to 40 degrees; (2) Using hot water pelletizing and ceramic scraper related measures, and adding 1% of waste slag, the test objectives were achieved and the control range of the vertical furnace production process parameters was determined: the combustion chamber temperature was 1030°C and the drying bed temperature was 450°C; (3) The pellet return rate decreased by 0.0%, the reducibility increased by 12%, the expansion index decreased by 2%, the soft melting range increased by 17°C, and the dripping temperature increased by 7°C. The improvement of reducibility, the reduction of expansion index and the increase of dripping temperature are all beneficial to the metallurgical properties of pellets. (4) Abandoned slag is added during vertical furnace production. Example

[0013] There are two kinds of research tests. Test 1 is a sintering cup laboratory study on the effect of adding waste slag on the quality of pellets. Test 2 is an industrial test of adding waste slag to a shaft furnace. The steps of the two tests are as follows: Experiment 1: Sintering cup laboratory studies the effect of waste slag addition on pellet quality: (1) The effects of increasing the waste slag ratio from 0% to 1.5% on the drop strength, compressive strength, compressive strength and high-temperature metallurgical properties (reducibility, reduction expansion and soft-melt dripping properties) of green balls were studied by using a pelletizing plate and roasting furnace in the laboratory. (2) In the experiment, we explored and adjusted the angle and rotation speed of the pelletizing disk, the roasting temperature and roasting time of the roasting furnace, so as to obtain pellets that meet the needs of the blast furnace and provide a basis for industrial production.

[0014] Test 2: Industrial test of vertical furnace with waste slag: (1) Increase the amount of steel balls put into the grinding machine during industrial production, increase the grinding operation current to more than 50A, and adjust the ball plate angle by 50 degrees; (2) Using hot water pelletizing and ceramic scraper related measures, and adding 1% of waste slag, the test objectives were achieved and the control range of the vertical furnace production process parameters was determined: the combustion chamber temperature was 1080°C and the drying bed temperature was 550°C; (3) The pellet return rate is reduced by 0.04%, the reducibility is increased by 14%, the expansion index is reduced by 3%, the soft melting range is increased by 20°C, and the dripping temperature is increased by 10°C. The improvement of reducibility, the reduction of expansion index and the increase of dripping temperature are all beneficial to the metallurgical properties of pellets. (4) Abandoned slag is added during vertical furnace production. Example

[0015] There are two kinds of research tests. Test 1 is a sintering cup laboratory study on the effect of adding waste slag on the quality of pellets. Test 2 is an industrial test of adding waste slag to a shaft furnace. The steps of the two tests are as follows: Experiment 1: Sintering cup laboratory studies the effect of waste slag addition on pellet quality: (1) The effects and rules of increasing the waste slag ratio from 0% to 1% on the drop strength, compressive strength, compressive strength and high-temperature metallurgical properties (reducibility, reduction expansion and soft-melt dripping properties) of green balls were studied by using a pelletizing plate and roasting furnace in the laboratory. (2) In the experiment, we explored and adjusted the angle and rotation speed of the pelletizing disk, the roasting temperature and roasting time of the roasting furnace, so as to obtain pellets that meet the needs of the blast furnace and provide a basis for industrial production.

[0016] Test 2: Industrial test of vertical furnace with waste slag: (1) Increase the amount of steel balls put into the grinding machine during industrial production, increase the grinding operation current to more than 50A, and adjust the ball plate angle to 47.5 degrees; (2) Using hot water pelletizing and ceramic scraper related measures, and adding 1% of waste slag, the test objectives were achieved and the control range of the vertical furnace production process parameters was determined: the combustion chamber temperature was 1050°C and the drying bed temperature was 500°C; (3) The pellet return rate decreased by 0.03%, the reducibility increased by 13.45%, the expansion index decreased by 2.8%, the soft melting range increased by 18.5°C, and the dripping temperature increased by 9°C. The improvement of reducibility, the reduction of expansion index, and the increase of dripping temperature are all beneficial to the metallurgical properties of pellets. (4) Abandoned slag is added during vertical furnace production.

[0017] The application method of adding abandoned slag ore in the production of vanadium-titanium pellets is used to optimize the ore blending to increase the input of vanadium-titanium resources, improve the quality of pellets, increase the output of vanadium products, reduce the cost of raw materials and improve the benefits. The effects of increasing the output quality and metallurgical properties of pellets with vanadium-titanium content, and the effects of different raw material particle composition on the production of vertical furnaces are studied. At the same time, the effects of increased titanium load on blast furnace production are studied. A series of experimental studies and process improvements are carried out in combination with the status of recoverable resources and the level of existing process equipment.

[0018] Abandoned slag is clinker with coarse particle size, small specific surface area, poor adhesion and overall poor balling performance. By studying the influence of different particle size compositions on vertical furnace production and balling process experiments, it is planned to use abandoned slag to replace Chengde iron powder for experimental research and production application, and explore the balling roasting technology of abandoned slag.

[0019] The key technology for preparing vanadium-titanium pellets from abandoned slag ore was developed to achieve low-cost preparation of high-quality vanadium-titanium furnace materials: In view of the problem that the clinker slag ore has a coarse particle size and a small specific surface area, which makes it difficult to make pellets, the lubrication grinding process and the ball-plate process parameter adjustment technology were strengthened; in view of the problem that the addition of abandoned slag ore is not conducive to the strength of the pellets, an efficient method for drying raw balls was developed; the roasting thermal system was optimized, and the roasting precautions for factors such as high clinker and alkali metal content were explored; at the same time, the low-cost preparation of high-quality vanadium-titanium furnace materials was achieved. .

[0020] In summary, the application method of adding waste slag ore in the production of vanadium-titanium pellets finally achieved the addition of 1% of waste slag ore in the vertical furnace, and the waste slag ore contained 1.5% vanadium, which increased the vanadium input. The addition of waste slag ore improved the metallurgical properties of the pellets (the pellet return rate was reduced by 0.03%; the reducibility was increased by 13.45%, the expansion index was reduced by 2.8%, the soft melting range was increased by 18.5°C, and the dripping temperature was increased by 9°C). The improvement of reducibility, the reduction of expansion index, and the increase of dripping temperature are all beneficial to the metallurgical properties of the pellets. At the same time, the increase of waste slag ore in the vertical furnace increased the vanadium input, reduced the cost of pig iron raw materials, and reduced the cost of molten iron by 0.54 yuan / ton.

Claims

1. A method for adding waste slag ore in the production of vanadium-titanium pellets, characterized in that: There are two kinds of research tests. Test 1 is a sintering cup laboratory study on the effect of adding waste slag on the quality of pellets. Test 2 is an industrial test of adding waste slag to a shaft furnace. The steps of the two tests are as follows: Experiment 1: Sintering cup laboratory studies the effect of waste slag addition on pellet quality: (1) The effects and rules of increasing the proportion of waste slag from 0% to 0.5-1.5% on the drop strength, compressive strength, compressive strength and high-temperature metallurgical properties (reducibility, reduction expansion and soft-melt dripping properties) of green balls were studied by using a pelletizing plate and roasting furnace in the laboratory. (2) In the experiment, the angle and rotation speed of the pelletizing disk, the roasting temperature and roasting time of the roasting furnace were adjusted to obtain pellets that meet the needs of the blast furnace, providing a basis for industrial production; Test 2: Industrial test of vertical furnace with waste slag: (1) Increase the amount of steel balls put into the grinding machine during industrial production, increase the grinding operation current to more than 50A, and adjust the ball plate angle to 40 to 50 degrees; (2) Use hot water pelletizing and ceramic scraper related measures, add 1% waste slag ore, achieve the test objectives, and determine the control range of vertical furnace production process parameters: combustion chamber temperature 1030 ~ 1080 ° C, drying bed temperature 450 ~ 550 ° C; (3) The pellet return rate is reduced by 0.02-0.04%, the reducibility is increased by 12-14%, the expansion index is reduced by 2-3%, the soft melting range is increased by 17-20°C, and the dripping temperature is increased by 7-10°C. The improvement of reducibility, the reduction of expansion index and the increase of dripping temperature are all beneficial to the metallurgical properties of pellets. (4) Abandoned slag is added during vertical furnace production.