A method for preparing nanometer zinc and iron concentrate from electric furnace dust

A technology of nano-zinc and iron concentrate, applied in the direction of improving process efficiency, etc., can solve the problems of low iron metallization rate and inability to obtain crystalline nano-zinc, and achieve good crystallinity, increase added value, and fully reduce and separate Effect

Active Publication Date: 2020-03-27
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the metallization rate of iron in the reduction product obtained under the conditions of this patent is still low, and it is impossible to obtain nano-zinc with good crystallinity
[0006] In addition, the current electric furnace dust is only limited to the treatment of medium and high zinc dust, and there is no treatment for low zinc dust

Method used

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  • A method for preparing nanometer zinc and iron concentrate from electric furnace dust
  • A method for preparing nanometer zinc and iron concentrate from electric furnace dust
  • A method for preparing nanometer zinc and iron concentrate from electric furnace dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Mix the biochar crushed to <74 μm with the electric furnace dust <74 μm and add water to obtain a mixture. In the mixture, the water content is 10wt%, and the carbon-iron ratio is 0.25. The obtained mixture was molded under the condition of 50MPa, and dried to obtain pellets with a compressive strength of 69.87N.

[0064] (2) Put the dried 20g pellets into a glass crucible, place them at the bottom of the quartz glass tube, and send the pellets into a vertical microwave oven ( figure 1 ), under the condition of feeding nitrogen, the microwave frequency is 2450MHz, heated to 1050°C at a heating rate of 25°C / min, reduced and roasted for 15min, and the flow rate of nitrogen is 2L / min; during the roasting process, the volatile things. After the biochar / electric furnace dust composite system undergoes microwave enhanced reduction, the reduction indicators are shown in Table 1. It can be seen from Table 1 that the metallization rate of iron reaches 96.20%, the volatiliza...

Embodiment 2

[0073] (1) Mix the biochar crushed to <74 μm with the electric furnace dust <74 μm and add water to obtain a mixture. In the mixture, the water content is 6wt%, and the carbon-iron ratio is 0.25. The resulting mixture was molded under the condition of 50MPa, and dried to obtain pellets with a compressive strength of 60.76N.

[0074] (2) 20g pellets after drying are put into a glass crucible, placed at the bottom of the quartz glass tube, and the pellets are sent into a vertical microwave oven. Under the environment of feeding nitrogen, the frequency of the microwave is under the condition of 2450MHz. Heating to 1020°C at a heating rate of 10°C / min, reduction roasting for 20min, nitrogen flow rate of 3L / min; volatiles were collected by cooling during the roasting process. Biochar / electric furnace dust composite system after microwave enhanced reduction. The metallization rate of iron reaches 95.38%, the volatilization rate of zinc is 97.49%, and the content of zinc in the resi...

Embodiment 3

[0077] (1) Mix the biochar crushed to <74 μm with the electric furnace dust <74 μm and add water to obtain a mixture. In the mixture, the water content is 12wt%, and the carbon-iron ratio is 0.27. The obtained mixture was molded under the condition of 70MPa and dried to obtain pellets with a compressive strength of 65.61N.

[0078] (2) Put the dried 30g pellets into a glass crucible, place them at the bottom of the quartz glass tube, and send the pellets into a vertical microwave oven ( figure 1 ), under the condition of feeding nitrogen, the frequency of microwave is 2450MHz, heating to 1050℃ at a heating rate of 20℃ / min, reducing and roasting for 25min, and the flow rate of nitrogen is 1L / min; during the roasting process, the volatile things. Biochar / electric furnace dust composite system after microwave enhanced reduction. The iron metallization rate reaches 95.86%, the zinc volatilization rate is as high as 97.72%, and the zinc content in the residue is only 0.042%. The...

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Abstract

The invention discloses a method for preparing nano zinc and iron concentrates from electric stove dust. The method comprises the following steps: mixing the electric stove dust, biochar and water toobtain a mixture; carrying out compression moulding on the mixture and drying the mixture to obtain pellets; carrying out reducing roasting on the pellets under microwave heating at the temperature of950-1100 DEG C to obtain volatile matters and reduction products; cooling and collecting the volatile matters to obtain nano zinc with complete crystal lattices; and carrying out magnetic separatingon the reduction products to obtain the magnetic iron concentrates. By cooperative treatment of a forming technology and a microwave heating treatment process, the reduction thermal efficiency is improved, and the product nano zinc with high additional value is obtained effectively. By clean energy microwave and 'carbon neutral' ( CO2 in the atmosphere cannot be increased additionally) biochar strengthened reduction process, clean and efficient enrichment and recovery of zinc and iron elements in the electric stove dust are implemented with the aid of a wet type magnetic separating process, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to a method for preparing nanometer zinc and iron concentrate from electric furnace dust, belonging to the field of solid waste recycling and utilization. Background technique [0002] With the rapid development of the steelmaking industry, the global crude steel output reached 1.623 billion tons in 2015, and China's crude steel output reached 803.83 million tons. The huge output of crude steel is accompanied by the generation and discharge of a large amount of waste water, dust, waste gas and other pollutants, which brings heavy pressure to the environment. Among them, iron and steel plant dust is a by-product of the entire iron and steel industry, and its production volume is about 10% of crude steel production. In 2015 alone, the world's steel plant dust production amounted to 162.3 million tons. Electric furnace dust is a typical iron and steel plant dust, mainly produced in the electric arc furnace steelmaking process. Gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B1/02C22B1/24C22B19/30C22B19/20
CPCC22B1/02C22B1/2406C22B7/001C22B7/02C22B19/20C22B19/30Y02P10/20
Inventor 彭志伟李光辉姜涛林小龙叶青张元波饶明军古佛全颜加兴李志忠彭建辉唐慧敏叶雷李骞徐斌杨凌志易凌云
Owner CENT SOUTH UNIV
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