Method for resource utilization of various metals in electroplating sludge

An electroplating sludge and multi-metal technology, applied in the extraction and separation of chromium, zinc, and high-value utilization, nickel, copper fields, can solve the problem of not realizing the resource utilization of valuable metals, and achieve high-value utilization of resources , The process is simple to operate and the effect of environmental friendliness

Inactive Publication Date: 2015-05-06
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology involves taking an electrically plated waste from various sources like industrial plants or manufacturing facilities into small pieces that could then use them effectively through different methods depending on their type of metal being deposited during processing. These techniques involve extracting valuable metals (such as gold) by dissolving it with acids while releasing other substances called impurities). By separating these components separately they make more efficient uses of this resource than traditional ways.

Problems solved by technology

Technological Problem addressed in this patented text relates to improving the efficiency and effectiveness of removing specific elements (such as Fe) from electrically conductive plasmat steel platelets during manufacturing or post processing operations without causing environmental concerns like disposal issues associated with these methods.

Method used

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  • Method for resource utilization of various metals in electroplating sludge

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Effect test

Embodiment 1

[0036] The dry basis of electroplating sludge raw material contains 9.0% chromium, 7.3% copper, 5.0% iron, 4.0% zinc, and 7.1% nickel. Take 1000g of electroplating sludge, slurry liquid-solid ratio of 8 / 1 (mL / g), add concentrated sulfuric acid 150g, stirring and self-heating leaching time of 2h, copper, nickel, zinc, and chromium were basically completely leached, and the iron leaching rate was 68%. The electroplating sludge sulfuric acid leaching solution uses LIX984N as the extractant and kerosene as the diluent. After four-stage extraction of copper (15% (v / v) Lix984N + kerosene, compared with O / A=1, stirring time at room temperature is 10min), the first-stage washing ( The concentration of sulfuric acid is 15 g / L, compared with O / A=2, and the stirring time at room temperature is 10min), after the first-stage stripping (the concentration of sulfuric acid is 250 g / L, compared with O / A=1, and the stirring time at room temperature is 10min), copper extraction The rate of coppe...

Embodiment 2

[0038] The dry base of electroplating sludge raw material contains chromium 18.3%, copper 7.7%, iron 7.2%, zinc 1.2%, nickel 9.9%, take electroplating sludge 1000g, slurry liquid-solid ratio 10 / 1 (mL / g), add concentrated sulfuric acid 250g, stirring and self-heating leaching time of 3h, copper, nickel, zinc, and chromium were basically completely leached, and the iron leaching rate was 73%. The electroplating sludge sulfuric acid leaching solution uses LIX984N as the extractant and kerosene as the diluent. After two-stage extraction of copper (30% (v / v) Lix984N + kerosene, compared to O / A=1, stirring time at room temperature for 10min), three-stage washing ( Sulfuric acid concentration 10 g / L, compared to O / A=2, stirring time at room temperature 10min), three-stage back extraction (sulfuric acid concentration 150 g / L, compared to O / A=1, stirring time at room temperature 10min), copper extraction The rate of copper extraction was 99.6%, and the copper extraction process did not...

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Abstract

The invention discloses a method for resource utilization of various metals in electroplating sludge, relates to recycling utilization of sludge containing various metals, and particularly discloses a method of extraction separation and high-value utilization of chromium, copper, nickel and zinc in chromium-containing electroplating sludge. The method is characterized by performing chromium precipitation in raffinate to obtain a chromium precipitation material of chromium phosphate after extracting copper from leachate of the electroplating sludge, removing phosphate radicals by using NaOH alkali liquor, then, re-dissolving chromic hydroxide obtained by filtering and separating, performing evaporative crystallization, preparing chromium sulfate basic, and recycling the alkali liquor, wherein copper, nickel and zinc are separated and recycled stepwise in the process. An environment-friendly electroplating sludge high-value utilization hydrometallurgy technology with simple processes and short flows is provided.

Description

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Claims

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Application Information

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Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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