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Method for biological desulfurization by catalytic oxidation of pyrite residue and associated non-ferrous metal leach

A technology of biocatalysis and non-ferrous metals, which is applied in the fields of biocatalytic oxidation desulfurization of sulfuric acid slag and leaching of associated non-ferrous metals. It can solve problems affecting practical applications, large equipment investment, and high energy consumption, and achieve high comprehensive utilization of resources. Investment and operation Low cost, good economic and environmental benefits

Inactive Publication Date: 2005-03-16
徐晓军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The beneficiation method is to use traditional methods such as gravity separation, magnetic separation, and flotation to process sulfuric acid slag; the roasting method is to roast the sulfuric acid slag first, and then use magnetic separation to recover iron; chlorination and roasting under the same conditions, and then reclaim iron and non-ferrous metals; the above methods all have large equipment investment, high energy consumption, or environmental pollution problems, which affect the practical application of these methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1 When the sulfuric acid slag is desulfurized by heap leaching, the sulfuric acid slag is crushed to a particle size of less than 50mm, and the height of the pile is 20m. 3+ The composite bacterial liquid is used for leaching, and the amount of sprayed bacterial liquid is less than 30L / m 2 .h. The bacterial content of the bacterial liquid is less than 40%; the compound bacterial liquid is cultivated with acid waste liquid, and the compound bacterial liquid contains Thiobacillus ferrooxidans, moderately thermophilic iron-oxidizing bacteria, and sericinous bacteria. During the leaching process, oxygen is intermittently filled. The temperature is controlled at less than 40°C, and the pH value is less than 3; finally, non-ferrous metals are recovered through hydrometallurgy.

Embodiment 2

[0009] Example 2: During sulfuric acid slag column leaching for desulfurization, the sulfuric acid slag is crushed to less than 10 mm and then loaded into the leaching column, and continuously and evenly sprayed with Fe-containing slag with a bacterial content of less than 50%. 3+ The compound bacterial solution is used for leaching; the amount of bacterial solution sprayed during the leaching process is less than 30L / m 2 .h, continuously filled with oxygen, the compound bacterial liquid is cultivated with acidic wastewater nutrient solution, the compound bacterial liquid contains moderately thermophilic sulfur-oxidizing bacteria, sulfidosporidium, and thermoacidic archaea, the leaching temperature is less than 50°C, and the pH value Control it to be less than 2, and finally recover non-ferrous metals after enrichment by chemical extraction.

Embodiment 3

[0010] Example 3 When the sulfuric acid slag is stirred and leached for desulfurization, the sulfuric acid slag is crushed and ground to less than 0.1mm, and Fe with a bacterial content of less than 40% is added to the mixing tank. 3+ The composite bacterial liquid is mechanically stirred and leached, and the pulp concentration is 60%; its Fe 3+ The compound bacteria solution is cultivated with acidic industrial wastewater nutrient solution. The bacteria in the compound bacteria solution are composed of moderately thermophilic iron-oxidizing bacteria and Sulfolobus. The stirring and leaching process is not filled with oxygen. The temperature of stirring and leaching is 50°C, and the pH value is 3. Finally, non-ferrous metals are recovered after enrichment by ion exchange method.

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Abstract

This invention has publicized one kind of sulfur acid residue biologically catalyzed oxidation desulphurization and the associated non-ferrous metal leaching method, it uses Fe # + [3+] containing bacterium for spray-wet method desulfurization of burnt ore of non- immerse type, the immerse type, the pile-soaking type, the shallow layer pile-soaking type, stir- soaking type, the granularity of which is the 25-50mm,at same time leaching non-ferrous metal. when leaching, it may be aerated or not aerated. The inventive method uses the hydrometallurgy, chemical extract, chemical precipitation, the electrolysis, the ion floats washes, ionic exchange and so on for recycling non-ferrous metals, the leaching temperature is 10 DEG C- 70 DEG C, and the pH value is 1.0-8.5. Burnt ore comprehensive utilization has provided a quick method for desulfurization and associated non-ferrous metal leaching method , in which investment is low, the energy consumption is low, the environmental pollution is little.

Description

technical field [0001] The invention relates to a technology for comprehensive utilization of solid waste resources in environmental protection, chemical industry and mining and metallurgy industries, in particular to a method for biocatalytic oxidation desulfurization of sulfuric acid slag and leaching of associated nonferrous metals. Background technique [0002] The treatment methods of industrial sulfuric acid waste residue mainly include ore dressing method, roasting method-magnetic separation combined method, high temperature chlorination method, etc. The beneficiation method is to use traditional methods such as gravity separation, magnetic separation, and flotation to process sulfuric acid slag; the roasting method is to roast the sulfuric acid slag first, and then use magnetic separation to recover iron; Carry out chlorination roasting, then reclaim the method for iron and non-ferrous metals; The above methods all have large equipment investment, high energy consump...

Claims

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Application Information

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IPC IPC(8): B09B3/00C22B3/18
CPCY02P10/20
Inventor 徐晓军宫磊杨虹宁平查湘义
Owner 徐晓军
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