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Method for comprehensively recycling silver, selenium, tellurium and copper from telluride copper slag

A technology of copper telluride and copper tellurium, which is applied in the fields of selenium/tellurium compounds, chemical instruments and methods, inorganic chemistry, etc., and can solve the problems of comprehensive recovery with few considerations and single considerations

Active Publication Date: 2015-09-23
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are mainly two methods for extracting tellurium from the copper telluride slag obtained by replacement, oxidative acid leaching and oxidative alkali leaching, as well as leaching methods such as neutral oxidation leaching and acidic oxidation complex leaching, but these methods only consider the leaching of tellurium. recovery, but less consideration is given to the comprehensive recovery of valuable metals such as silver, selenium, and copper, which are relatively high in copper telluride slag

Method used

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  • Method for comprehensively recycling silver, selenium, tellurium and copper from telluride copper slag
  • Method for comprehensively recycling silver, selenium, tellurium and copper from telluride copper slag
  • Method for comprehensively recycling silver, selenium, tellurium and copper from telluride copper slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Copper removal experiment by oxidative acid leaching of copper telluride slag

[0043] The copper telluride slag used in the experiment is the copper telluride slag wet material produced by the comprehensive workshop of the Copper Company of Baiyin Nonferrous Metals Group Co., Ltd., and its water content is 36-38%. In a 2000ml beaker, add 500g of wet telluride copper slag ( According to the drying capacity of 64%, the solid is 320g), add 800ml of water (the liquid-solid ratio is 3:1), and stir to form a slurry; then add 40ml of 93% industrial sulfuric acid and 32g of copper sulfate pentahydrate successively under stirring; heat When the temperature is above 90°C, air is continuously introduced into the reaction slurry and stirred, and the composite oxidant SC solution formed by dissolving 55g of oxidant, 25g of salt, and 250g of water is added dropwise within 2 hours, and then reacted for 1-1.5h after the drop is completed; while it is hot Filtrate, wash the ...

Embodiment 3

[0051] Example 3: Preparation of TeO by wet purification 2 product experiment

[0052] Put all the 2560ml alkali immersion solution obtained by the above reaction into a 3000ml beaker, and under stirring at room temperature, add 0.1g of EDTA solution, 5g of anhydrous calcium chloride powder, and 5g of sodium sulfide powder successively, continue to stir and react for 2h, and let it stand overnight. Let the sediment grow up and fully settle. The next day, all the impurity-removed solution was filtered to obtain 2570 ml of light yellow transparent solution. The filtered slag is impurity-removed slag, which is dried to obtain 17.3g, which can be returned to the high-pressure leaching process of the KALDO furnace for secondary recovery of copper and tellurium.

[0053] Put all the clarified liquid obtained after impurity removal and filtration into a 3000ml beaker, install a stirring device, heat to above 60°C, and slowly add 1+3 dilute sulfuric acid (1 part of 98% reagent grade...

Embodiment 4

[0059] Example 4: Tellurium electrowinning experiment

[0060] The tellurium electrowinning test is carried out in the laboratory, and the TeO used in the test 2 The product is the pilot test TeO obtained from the pilot test of the tellurium slag project 2 The product, its tellurium grade is 69.49%, two electrowinning experiments share wet TeO 2 Product 15kg (solid content 22-23%). The electrolytic cell used in the test is self-made with plexiglass plate, the volume of the electrowinning cell = length 28cm × width 12cm × depth 15cm = 5.0L, and the actual electrolyte solution is 4-4.5L. The anode plate for electrowinning is made of iron, and the cathode plate is made of stainless steel. The electrowinning area of ​​a single cathode plate is 0.096m×0.100m×2≈0.02m 2 ; Power is provided by SDD-1250 electrolytic plating power supply.

[0061] Use an 8L stainless steel container as the reaction device, add 4.0L of the residual solution after the first electrodeposition, add wate...

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Abstract

The invention discloses a method for comprehensively recycling silver, selenium, tellurium and copper from telluride copper slag. The method comprises the following steps of (1), oxidizing acid leaching, wherein the telluride copper slag is added into a sulfuric acid solution containing an oxidizing agent to be heated and stirred so as to be leached, after filtering, copper sulfate leaching liquid and acidic leaching residues are obtained, and the leaching liquid is conveyed to a furnace for copper recycling; and (2) alkali leaching separation, wherein the acidic leaching residues are added into sodium hydroxide solutions to be leached, sodium tellurite solutions and basic leached residues are obtained, the basic leached residues are sent to the KALDO furnace for smelting, so that the silver and the selenium are recycled, and after purification, tellurium deposition, forging and electrolysis of the alkali leaching liquid, refined tellurium is obtained. According to the method, the recycling rate of the silver, the selenium, the tellurium and the copper is high, the silver, the selenium, the tellurium and the copper are not lost, the concentration ratio is high, the silver, the selenium, the tellurium and the copper can be separated from other impurities well, the pollution to the environment is small, the technology is simple, and needed equipment cost is low.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy engineering, and in particular relates to a method for comprehensively recovering silver, selenium, tellurium and copper from telluride copper slag. Background technique [0002] Copper anode slime contains a certain amount of tellurium. In the KALDO furnace treatment process, the copper anode slime is added to the normal pressure prepreg tank, supplemented with sulfuric acid, tellurium-precipitated liquid and process water, heated to 80°C by steam, stirred and leached with air or oxygen, so that part of the copper is transferred from the solid phase to the In the liquid phase, the supernatant is sent to the clean liquid workshop to process and recover copper; the precipitated slurry is sent to the autoclave, and the temperature is raised to 120°C by steam, and stirred and leached by oxygen under acidic conditions, so that the impurities are transformed from slag phase After the reaction ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B15/00C22B11/00C01B19/00C25B1/00
CPCY02P10/20
Inventor 王永斌汪友元马进余江鸿吴斌黄建芬周涛吉鸿安王进龙张析栗威
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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