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Method for treating arsenic-containing waste copper slag

A technology for copper slag and black copper slag is applied in the field of processing black copper slag and arsenic-containing waste copper slag. Effect

Inactive Publication Date: 2012-08-15
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The roasting method produces flue gas containing toxic arsenic oxides, polluting the environment
The acid leaching method is to oxidize and leach black copper slag in an acidic medium, recover the copper in the form of copper sulfate, and recover most of the arsenic in the form of arsenic trioxide; however, arsenic trioxide is a highly toxic arsenic compound. The pressure on safety and environmental protection is very high; the arsenic recovery efficiency of ordinary alkaline leaching method is low, the alkali consumption is high, and it is difficult to comprehensively recover valuable metals such as silver, antimony, and bismuth
Therefore, when processing black copper slag, the harmful substance arsenic is distributed in every process of the process, causing serious pollution to the environment around the site

Method used

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  • Method for treating arsenic-containing waste copper slag
  • Method for treating arsenic-containing waste copper slag
  • Method for treating arsenic-containing waste copper slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The composition of black copper slag produced by an electrolytic copper factory is Ni0.87%, Co0.0052%, Cu56.72%, Fe0.23%, Pb0.056%, Zn0.0034%, Mn0.022%, As5.18 %, Sb0.37%, Bi0.56%, S4.23%, Ag538.75 (g / t), SiO 2 1.0%. The black copper slag is fully mixed with sodium hydroxide, the alkali coefficient of the used sodium hydroxide is 2.0, and the ore is ground by a ball mill; the product after grinding is placed in a roasting kiln in a micro-oxidizing atmosphere and roasted at a temperature of 550 ° C for 2 hours. Roasted slag is obtained; the roasted slag is subjected to water leaching to remove arsenic, and the liquid-solid ratio during water leaching for arsenic removal is 5 1. The water immersion temperature is 60°C, and the water immersion time is 60 minutes; all the arsenic in the roasted slag is transferred into the leaching solution to obtain a water leaching pulp; during the water immersion process, the copper, antimony, bismuth, etc. in the roasted slag do not en...

Embodiment 2

[0055] The composition of black copper slag produced by an electrolytic copper factory is: Ni1.36%, Co0.015%, Cu41.48%, Fe0.066%, Pb0.064%, Zn0.0038%, Mn0.0041%, As4. 05%, Sb0.69%, Bi0.60%, S8.02%, Ag 666.25 (g / t). Fully mix the black copper slag with sodium carbonate, the alkali coefficient of all sodium carbonate is 1.5, grind the ore in a ball mill; place the ground product in a roasting kiln for 1.5 hours at 600°C in a slightly oxidizing atmosphere to obtain the roasted slag; the roasted slag is subjected to water leaching to remove arsenic, and the liquid-solid ratio during water leaching to remove arsenic is 6 1. The water immersion temperature is 65°C, and the water immersion time is 40 minutes, so that all the arsenic in the roasted slag is transferred into the leaching solution to obtain a water leaching pulp; during the water immersion process, the copper, antimony, bismuth, etc. in the roasted slag do not enter the water Leach ore pulp; screen and classify the wat...

Embodiment 3

[0067] Fully mix the black copper slag and calcium hydroxide, the alkali coefficient of the calcium hydroxide used is 1.75, grind the ore in a ball mill; place the ground product in a roasting kiln for 2.5 hours at 500°C in a micro-oxidizing atmosphere to obtain roasted After slag; the roasted slag is subjected to water leaching to remove arsenic, and the liquid-solid ratio during water leaching to remove arsenic is 5.5 1. The water immersion temperature is 62.5°C, and the water immersion time is 50 minutes, so that all the arsenic in the roasted slag is transferred into the leaching solution to obtain a water leaching pulp; during the water immersion process, the copper, antimony, bismuth, etc. in the roasted slag do not enter the water Leach slurry; sieve and classify the water leaching slurry to obtain coarse-grained slurry with a particle size greater than 0.2mm and fine-grade slurry with a particle size less than 0.2mm; the coarse-grained material is returned to the coppe...

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Abstract

The invention provides a method for treating arsenic-containing waste copper slag. The method comprises the following steps of: adding alkali and arsenic fixation roasting on the arsenic-containing waste copper slag from a copper electrolysis purification procedure to convert the arsenic into low-toxicity, water-soluble and nonvolatile arsenate, leaching the roasting slag into water to remove the arsenic, recovering copper and enriching antimony bismuth silver by virtue of acid leaching, and embedding calcium arsenate sediment converted from the arsenic in the water leaching solution; and comprehensively recovering valued metals such as copper, silver, antimony and bismuth in the black copper slag. The method is a safe and effective wet smelting method for recovering the valued metals in the black copper slag, and the arsenic and the copper are leached separately; the recovery rate of the copper in the black copper slag reaches 99.6 percent, and the removal rate of the arsenic reaches over 98 percent; over 95 percent of antimony and over 98 percent of bismuth enter the slag, and over 98 percent of silver also enters the acid leaching slag by adding trace chlorine radicals during acid leaching, so that the antimony, the bismuth and the silver are comprehensively recovered; and the method has the advantages of low equipment investment, short flow, low running cost and safe and reliable operating environment.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal wet smelting, and relates to a method for processing black copper slag, in particular to a method for processing waste copper slag containing arsenic. Background technique [0002] During the purification process of the electrolyte in the copper refining system, arsenic, antimony, bismuth and copper are precipitated on the cathode together, and black copper slag with complex components and high arsenic content is produced. The amount of black copper slag is usually 1.0-1.5% of the amount of electric copper, and its chemical composition is copper content 50%-60%, arsenic content 5-10%, antimony content 0.4-0.7%, bismuth content 0.5-0.6%, silver Content 500~800g / t. The treatment of black copper slag has always been a difficult problem in nonferrous metallurgy. Various enterprises have made long-term efforts, but there has been a lack of an economical and environmentally friendly treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C22B11/00C22B30/02C22B30/06A62D3/00
CPCY02P10/20
Inventor 张晗陈彩霞赵秀丽张彦儒
Owner JINCHUAN GROUP LIMITED
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