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Method of recovering valuable metal from selenium-containing acid mud

A technology of valuable metals and selenate mud, which is applied in chemical instruments and methods, arsenic oxide/arsenic hydroxide/oxyacid arsenic, element selenium/tellurium, etc., can solve the problems of difficult recovery and achieve the goal of saving leaching rate The effect of cost, short process flow and easy operation

Inactive Publication Date: 2018-12-21
CHENZHOU FENGYUE ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for recovering valuable metals from selenate-containing mud, which solves the problem of difficult recovery of valuable metals and arsenic from high-arsenic mercury-containing selenate mud in the prior art, and makes mercury, arsenic These dangerous substances are properly disposed of, the cost per unit consumption is low, the recycling process is environmentally friendly, and the operation is simple, suitable for large-scale industrial applications

Method used

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  • Method of recovering valuable metal from selenium-containing acid mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Low-temperature roasting: Take 500g of selenium-containing mud (Pb 38%, Cu5.76%, As8.5%, Se3.6%, Hg0.55%) and roast in a crucible at a roasting temperature of 360°C for 6 hours. After roasting, The mercury removal rate is 99%, and there is almost no loss of selenium, copper and lead.

[0031] Acid leaching: Take 200g of the above-mentioned roasted sample, add sulfuric acid solution or acid secondary immersion solution, the liquid-solid ratio is 5:1, react for 2 hours at a water bath temperature of 80°C, control the acidity at the end point to 50g / L, filter and sample for testing, the liquid composition For: H + 51.27g / L, As 14.45g / L, Cu 10.05g / L, Se 4.67g / L, the solution has no mercury ions.

[0032] Acid two leaching: add sulfuric acid solution to the above-mentioned acid one leaching residue at a liquid-solid ratio (L / kg) of 5:1, control the acidity at the end point to 80g / L, react at a water bath temperature of 80°C for 2 hours, then filter, and sample the component...

Embodiment 2

[0037] Low-temperature roasting: take 500g of selenium-containing mud (Pb47%, Cu 3.76%, As 6.5%, Se 4.6%, Hg 1.77%) and roast in a crucible. The roasting temperature is 400°C, and the heat preservation is 5h. The mercury removal rate after roasting is 99%. %, almost no loss of selenium, copper and lead.

[0038] Acid leaching: Take 200g of the above-mentioned roasted sample, add sulfuric acid solution or acid second immersion solution, the liquid-solid ratio is 4:1, and react for 2 hours at a water bath temperature of 80°C, add sulfuric acid to control the end-point acidity to 60g / L, filter and sample for testing, The liquid composition is: H + 60.27g / L, As15.05g / L, Cu 7.33g / L, Se 10.08g / L, no mercury ion in solution assay.

[0039]Acid two leaching: add sulfuric acid solution to the above acid one leaching residue at a liquid-solid ratio of 4:1, then add concentrated sulfuric acid to adjust the acidity to 95g / L, react at a water bath temperature of 80°C for 2 hours and filte...

Embodiment 3

[0044] Low-temperature roasting: Take 500g of selenium-containing mud (Pb 53%, Cu 4.76%, As 7.5%, Se 5.3%, Hg3.04%) and roast in a crucible at a roasting temperature of 500°C, keep it warm for 4 hours, and remove mercury after roasting The rate is 99%, and there is almost no loss of selenium, copper and lead.

[0045] Acid leaching: Take 200g of the above-mentioned roasted sample, add sulfuric acid solution or acid second immersion solution, the liquid-solid ratio is 4:1, react for 2 hours at a water bath temperature of 80°C, add sulfuric acid to control the end-point acidity to 80g / L, filter and sample for testing, The liquid composition is: H + 79.27g / L, As16.11g / L, Cu 8.43g / L, Se 10.66g / L solutions were assayed without mercury ions.

[0046] Acid two leaching: Add sulfuric acid solution to the above-mentioned acid one leaching residue at a liquid-solid ratio of 4:1, then add concentrated sulfuric acid to adjust the acidity to 120g / L, react at a water bath temperature of 80...

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Abstract

The invention belongs to the field of comprehensive recovery and utilization of metallurgical waste slags, and discloses a method of recovering valuable metal from selenium-containing acid mud. The method comprises the following steps that A, low-temperature roasting is carried out, the low-temperature roasting is carried out on the selenium-containing acid mud, a mercury removal rate of the roasted selenium-containing acid mud is roasted to 99% or above, and high-mercury smoke dust and high-selenium roasted sand slag is obtained; B, first acid leaching is carried out on the roasted slag; C, second acid leaching is carried out on the roasted slag, the first acid leaching is conducted on second acid leaching solution, and the slag is recycled to a lead system; D, selenium reduction is carried out, a reducing agent is added into the first leaching solution obtained in the step C to carry out reduction on selenium to prepare crude selenium; E, copper replacement is carried out, iron powder is added into the reduced post-liquid obtained in the step D to carried out displacement and reduction on copper, and high-grade copper slag is obtained; and F, the post-liquid obtained in the stepE is reduced, evaporated, concentrated, cooled, crystallized to recycle arsenic, and the wastewater is sent to a wastewater station for treatment. The method of recovering valuable metal from the selenium-containing acid mud has the remarkable characteristics of simple process operation, no environmental pollution, high recovery value, low operation cost and high economic benefit.

Description

technical field [0001] The invention belongs to the field of comprehensive recovery and utilization of waste residues, and in particular relates to a method for recovering valuable metals from selenium-containing mud. technical background [0002] The content of selenium in the earth's crust is 0.05×10 -6 , usually extremely difficult to form industrial enrichment. The occurrence state of selenium can be roughly divided into three categories: one exists in the form of independent minerals, the second exists in the form of isomorphism, and the third exists in the form of clay mineral adsorption. The main raw material (90%) for industrial selenium extraction is anode slime produced by copper electrolytic refining, and the rest comes from calcine produced by refining lead, cobalt and nickel, and residual sludge produced by sulfuric acid. The selenium-containing mud described in this patent has high valuable metal content and high selenium-containing taste. It is undoubtedly a...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B7/00C22B13/02C22B13/00C22B15/00C01B19/02C01G28/00
CPCC01B19/02C01G28/005C22B1/02C22B7/006C22B7/007C22B13/025C22B13/045C22B15/0006C22B15/0071C22B15/0091Y02P10/20
Inventor 段良洪陈露萍刘伟高海明王敏杰曹文法
Owner CHENZHOU FENGYUE ENVIRONMENTAL PROTECTION TECH
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