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Comprehensive recovery method of ferrous metallurgical solid wastes

A solid waste, iron and steel metallurgy technology, applied in the direction of improving process efficiency, can solve the problems of waste of resources, ineffective utilization of iron and steel metallurgy solid waste, environmental pollution, etc., and achieve good economic and social benefits.

Inactive Publication Date: 2014-08-06
XINGTAI POLYTECHNIC COLLEGE
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for comprehensive recycling of iron and steel metallurgical solid waste to solve the problems of resource waste and environmental pollution caused by the ineffective utilization of iron and steel metallurgical solid waste

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  • Comprehensive recovery method of ferrous metallurgical solid wastes

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Embodiment 1

[0029] Table 1 shows the composition of iron and steel metallurgical solid waste such as blast furnace gas ash, sinter dust removal ash, and ironmaking furnace dust after mixing (the content is in mass percentage).

[0030] Table 1

[0031] TF K Na Pb Zn C Cl- 38.32 5.51 0.78 0.38 10.52 10.14 6.58

[0032] as attached figure 1 As shown, the method of comprehensive recycling of iron and steel metallurgical solid waste is as follows:

[0033] (1) Grind iron and steel metallurgical solid waste into 100% powder, leaching in water at 70-80°C, the liquid-solid ratio (solid-liquid mass ratio) is controlled at 2-4:1, and the stirring speed is 100-500 r / min , Stirring time 10-30min, making KCl immerse into the solution.

[0034] (2) Add Na to the leaching solution of KCl 2 S and K 2 SO 4 , to remove impurities in the leaching solution, and then carry out evaporation concentration and crystallization to extract KCl at a temperature of 95°C.

[003...

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Abstract

The invention relates to a comprehensive recovery method of ferrous metallurgical solid wastes. The method adopts the technical scheme that the following steps are included: firstly, the ferrous metallurgical solid wastes are washed with water to immerse KCI in the leaching solution; KCI is extracted through crystallization and purification; high-intensity magnetic separation and low-intensity magnetic separation are performed on the washing residue to obtain powered iron; the mixture of mineral tailings of magnetic separation and a reducing agent are roasted, so that zinc in the solid wastes is reduced and volatilized, and the reduced and volatilized zinc enters into fume; metallic zinc is obtained through leaching, refinement, electro-deposition of the fume containing zinc; the direct reduced iron is obtained through the low-intensity magnetic separation of the roasting residue. With the adoption of the comprehensive recovery method of the ferrous metallurgical solid wastes, elements such as Fe, C and the like in the solid wastes can be effectively recycled and reutilized, and non-ferrous metals like K and Zn in the solid wastes can be extracted, so that the comprehensive utilization of the metallurgical solid wastes is facilitated.

Description

technical field [0001] The invention relates to the technical field of comprehensive recycling of metallurgical waste, in particular to a method for comprehensive recycling of iron and steel metallurgical solid waste. Background technique [0002] With the rapid development of China's iron and steel industry, its by-products, such as blast furnace gas ash, sintering electrostatic precipitator ash, ironmaking furnace dust, steelmaking sludge and other metallurgical solid wastes, are also increasing year by year. However, these solid wastes are difficult to utilize due to their complex composition, fine particle size, and large fluctuations in moisture content. In addition, these zinc-containing iron and steel metallurgical solid wastes are classified as "toxic solid wastes", requiring recycling or passivation treatment of zinc, etc., otherwise they must be sealed and stacked. Therefore, for iron and steel enterprises, how to truly make economical, reasonable, efficient and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B7/00
CPCY02P10/20
Inventor 何红升
Owner XINGTAI POLYTECHNIC COLLEGE
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