Method for harmlessly treating arsenic-containing waste slag and comprehensively recycling valuable metals in arsenic-containing waste slag

A valuable metal and waste slag technology, applied in chemical instruments and methods, arsenic compounds, inorganic chemistry, etc., can solve the problems of low direct recovery rate of valuable metals, arsenic pollution, low comprehensive recycling rate, etc., to solve arsenic pollution Problems, adaptation to a wide range of effects

Active Publication Date: 2015-07-22
郴州雄风环保科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for harmless disposal of arsenic-containing waste residue and comprehensive recovery of

Method used

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  • Method for harmlessly treating arsenic-containing waste slag and comprehensively recycling valuable metals in arsenic-containing waste slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0014] Take 5 tons of raw material and grind it finely, which contains 6.89% arsenic, 7.68% bismuth and 35.32% lead;

[0015] (1) Roasting for arsenic removal: at a temperature of 600-650°C, add 200kg of oxidant manganese dioxide, and roast in a rotary kiln for 6 hours. 1132kg of arsenic-containing dust and 4035.8kg of arsenic-removed slag were obtained. Among them, the arsenic-containing dust contains 28.58% arsenic, 7.28% bismuth, and 33.67% lead; the arsenic-removed slag contains 0.52% arsenic, 7.47% bismuth, and 34.32% lead. The removal rate of arsenic is 93.91%;

[0016] (2) Water leaching of arsenic-containing soot: put the arsenic-containing soot obtained in the previous step at a temperature of 85-95°C for 3-4 hours, add 25t of water, leaching and filtering to obtain an arsenic-containing solution of 21.18m 3 It contains 15.07g / L of arsenic and 700.5kg of arsenic leaching slag, which contains 0.61% of arsenic, 53.86% of lead and 11.64% of bismuth;

[0017] (3) Purif...

Embodiment approach 2

[0020] Take 1 ton of raw material and grind it finely, which contains 19.8% arsenic, 15.2% bismuth, 16.3% copper, and 15.8% lead;

[0021] (1) Roasting for arsenic removal: at a temperature of 600-650°C, add 4kg of oxidant manganese dioxide, and roast in a reverberatory furnace for 6 hours. 352.12kg of arsenic-containing dust and 685.38kg of arsenic-removed slag were obtained. Among them, the arsenic-containing dust contains 54.94% arsenic, 7.91% bismuth, 9.56% lead, and 4.22% copper; the arsenic removal slag contains 0.66% arsenic, 18.11% bismuth, 18.14% lead, and 21.61% copper. The removal rate of arsenic is 97.72%;

[0022] (2) Water leaching of arsenic-containing soot: put the arsenic-containing soot obtained in the previous step at a temperature of 85-95°C for 3-4 hours, add 7t of water, leaching and filtering to obtain 6830L of arsenic-containing solution, which contains 28.19g / L of arsenic and 112.53kg of arsenic leaching residue, containing 0.81% arsenic, 29.61% lead...

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Abstract

The invention relates to a method for harmlessly treating arsenic-containing waste slag and comprehensively recycling valuable metals in arsenic-containing waste slag, and belongs to the field of comprehensive recycling of non-ferrous metals. The method comprises the following steps: adding an oxidant into the arsenic-containing waste slag, roasting at the medium temperature in a rotary kiln or a reverberatory furnace, after arsenic in the arsenic-containing waste slag completely volatilizes, cooling through a section of U-shaped tube, and retaining the recycled arsenic-containing fume in a cloth bag in a fume manner; directly extracting the valuable metals in the arsenic-removed waste slag by using an ordinary pyrogenic process or a wet process; performing water-leaching on the arsenic-containing fume, thereby obtaining arsenic-containing liquid and arsenic-leached slag, and further extracting high-purity indium through ordinary indium-leaching-extraction; performing a pyrogenic smelting process on the indium-leached slag so as to recycle valuable metals such as lead and bismuth; purifying the arsenic-containing liquid, and performing cooling crystallization, thereby obtaining arsenic trioxide. Due to the adoption of the method, the problems of low comprehensive recycling rate, low valuable metal direct yield, arsenic pollution and the like can be simultaneously solved.

Description

technical field [0001] The invention belongs to the field of comprehensive recovery of nonferrous metals. It specifically relates to a method for harmlessly disposing of arsenic-containing waste residue and comprehensively recovering valuable metals therein. Background technique [0002] The arsenic-containing waste slag in the prior art is mixed with arsenic-free materials to reduce the arsenic content and then smelted in a blast furnace or a reverberatory furnace. Such repeated closed-circuit circulation will only increase the amount of arsenic in the system, seriously pollute the environment and make the production and working environment worse and worse, which is extremely harmful to the health of operators, and its direct recovery rate is low (less than 80%) . Others use high-pressure oxygen leaching (acid leaching), which requires high production costs and strict operating conditions. A little carelessness may cause highly toxic gases such as arsine to emerge, causin...

Claims

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Application Information

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IPC IPC(8): C22B7/04C01G28/00
CPCY02P10/20
Inventor 张二军谭雄玉
Owner 郴州雄风环保科技有限公司
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