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Valuable metal extraction process suitable for electroplating sludge

A technology for valuable metals and electroplating sludge, which is applied in the direction of improving process efficiency, can solve the problems of unsatisfactory leaching rate of valuable metals, increased energy consumption, and difficulty in practical use, achieving cyclic enrichment, reducing dangerous properties, The effect of improving the leaching rate

Pending Publication Date: 2021-11-02
苏州镕鑫城环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leaching time is shortened to 6 days with the application of moderate thermophilic heterotrophic bacteria, but the high temperature of 65°C leads to a significant increase in energy consumption, making it difficult to be practical, and the leaching rate of valuable metals is not ideal

Method used

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  • Valuable metal extraction process suitable for electroplating sludge
  • Valuable metal extraction process suitable for electroplating sludge
  • Valuable metal extraction process suitable for electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add sulfur and pyrite to the bioleaching regeneration tank, and add sulfur / iron oxidizing compound flora to obtain an active leachate, the pH of the active leachate is 0.8, the concentration of Fe3+ is 1000mg / L, and the concentration of Fe2+ is 500mg / , the solid-to-liquid ratio of the active leachate is 8%, the active leachate is pumped into the bioleaching extraction tank through a peristaltic pump, and the active leachate enters the bioleaching extraction tank through the membrane module In the process, the supernatant in the bioleaching regeneration tank can be pumped directly into the bioleaching extraction tank for extraction reaction, so as to improve the preparation reaction efficiency of the overall equipment, adding solid waste to the bioleaching extraction tank The material undergoes leaching reaction to complete the bioleaching of valuable metals. After the leaching reaction is completed, the mud-water mixture is introduced into a solid-liquid separation dev...

Embodiment 2

[0043] like figure 1 , the comparison of rubidium soot expensive metal rubidium bioleaching-cycle enrichment and sulfuric acid leaching-cycle enrichment performance is as follows:

[0044] The new technology of MBR bioleaching-circular enrichment can quickly extract-enrich the expensive metal rubidium in iron and steel smelting dust collection dust under the condition of 15% high solid-liquid ratio. Aqueous solution leaching-enrichment efficiency is compared, the results are shown in figure 1 . The new MBR bioleaching-circular enrichment process can realize the complete extraction of expensive metal rubidium in the soot, that is, the leaching rate is 100%, and the bioleaching efficiency (ie, the leaching rate) does not decay during the 5 cycles; the initial sulfuric acid leaching The efficiency is obviously lower than that of bioleaching, the leaching rate is about 80%, and the efficiency of sulfuric acid leaching continues to decline during the 5 cycles, the initial water l...

Embodiment 3

[0046] The performance comparison of oxide electroplating sludge bioleaching-circulation enrichment and sulfuric acid extraction-circulation enrichment is as follows:

[0047] The new MBR bioleaching-circulation enrichment process rapidly extracts-highly enriches the valuable metals in the oxide electroplating sludge under the condition of 10% high solid-liquid ratio, and performs the same acidity as the sulfuric acid solution leaching-enrichment performance. compare, see figure 2 and image 3 . The research shows that the new MBR bioleaching-circulation enrichment process can realize the complete dissolution of four valuable metals copper, nickel, zinc, and chromium in oxide electroplating sludge, and the bioleaching efficiency does not decay during the five cycle processes; The initial sulfuric acid leaching efficiency was significantly lower than that of bioleaching, and the sulfuric acid leaching efficiency continued to decline during the five cycles, which made it diff...

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Abstract

The invention discloses a valuable metal extraction process suitable for electroplating sludge. The valuable metal extraction process comprises the steps that an inorganic energy substrate is added into a bioleaching regeneration tank, a catalytic strain is added to obtain an active leaching solution, the active leaching solution is introduced into a bioleaching extraction tank, and a solid waste material is added into the bioleaching extraction tank to carry out an extraction reaction; after the extraction reaction is finished, a sludge-water mixture is introduced into a solid-liquid separation device for solid-liquid separation, an invalid leaching solution dissolved with valuable metal and detoxified residues are obtained, the invalid leaching solution dissolved with the valuable metal is recycled into the bioleaching regeneration tank, the extraction reaction is carried out again under the catalytic action of the catalytic strain, and the operation is repeated multiple times; and meanwhile, the detoxified residues are washed to remove the valuable metal in residual reaction so as to ensure that the product reaches the standard and is uncapped. MBR is applied to the bioleaching process, and the flora density can be improved by one order of magnitude through the interception effect of a membrane assembly, so that the extraction time is greatly shortened, and the extraction efficiency of the valuable metal is effectively improved.

Description

technical field [0001] The invention relates to the technical field of electroplating sludge treatment, in particular to a valuable metal extraction process suitable for electroplating sludge. Background technique [0002] Electroplating is the most commonly used surface treatment method for metal-based industrial devices / products, with the purpose of anti-corrosion, anti-oxidation, strong electrical conductivity, promoting smoothness, and improving appearance. my country is the largest manufacturing country in the world, and the output of more than 200 bulk industrial products accounts for more than 50% of the world. As an important supporting basic process of industrial manufacturing, the electroplating industry has developed rapidly and is accelerating in recent years. At present, there are about 15,000 electroplating enterprises in my country, which are distributed in machinery manufacturing, electronics industry, aerospace industry, instrumentation industry and light in...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/18
CPCC22B7/006C22B3/18Y02P10/20
Inventor 辛宝平
Owner 苏州镕鑫城环保科技有限公司
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