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Method for recycling rhenium from copper smelting waste acid

A technology for copper smelting and waste acid, applied in the direction of improving process efficiency, can solve problems such as complex conditions, waste, pollution of environmental resources, etc., and achieve the effect of obvious economic value and high recovery rate

Active Publication Date: 2013-12-04
YANGGU XIANGGUANG COPPER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conditions of this method are complicated, it must be a polyol solvent, and the acidic substance of the reaction is perchloric acid or hydrochloric acid, which is different from the sulfuric acid system of copper smelting waste acid. This method is not adaptable and feasible for copper smelting waste acid
[0005] Due to the complex composition of waste acid, the output is large (annual output of 400,000 tons of mineral cathode copper enterprise waste acid output is 500-700Nm 3 / d), there are certain technical difficulties in extracting rhenium from waste acid, and there are problems in industrial application. Most smelters discard it, which not only pollutes the environment but also causes waste of resources

Method used

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  • Method for recycling rhenium from copper smelting waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Direct extraction of rhenium from waste acid: take 1 liter of waste acid from copper smelting, waste acid components: Cu 0.1g / L, As0.9g / L, Re 0.018g / L, H 2 SO 4 100g / L. Put 1 liter of waste acid in a container, turn on the stirrer, heat the waste acid to 70°C, add 5 g of sodium thiosulfate to 1 liter of waste acid, react for 1 hour, filter, and separate solid and liquid to obtain rhenium-rich concentrate.

[0042] The filtrate is copper removal tail liquid, tail liquid composition: Cu 0.005g / L, As 0.8g / L, Re0.0005g / L, H 2 SO 4 100g / L. The filter cake contains 14.6% copper and 3.1% rhenium. Calculated according to the composition of waste acid stock solution and rhenium extraction tail liquid, the recovery rate of rhenium is 97%.

Embodiment 2

[0044](1) Pre-decoppering of waste acid: take 1 liter of waste acid from copper smelting, components of waste acid: Cu 0.5g / L, As0.8g / L, Re 0.015g / L, H 2 SO 4 150g / L. Put 1 liter of waste acid in a container, turn on the stirrer, heat the waste acid to 65°C, add a corresponding amount of sodium thiosulfate according to 1.7 times the amount of copper in the waste acid, react for 1 hour, filter, solid-liquid After separation, the copper-removing tail liquid enters the rhenium extraction process, and the filter residue can be returned to the copper smelting system.

[0045] The filtrate is copper removal tail liquid, tail liquid composition: Cu 0.05g / L, As 0.8g / L, Re0.015g / L, H 2 SO 4 150g / L. The filter cake contains 55.14% copper and 0.008% rhenium. Calculated according to the components of waste acid stock solution and decopper tail liquid, the copper recovery rate is 90%, the rhenium recovery rate is 100%, and arsenic does not precipitate during the copper removal proce...

Embodiment 3

[0050] (1) Pre-decoppering of waste acid: take 1 liter of waste acid from copper smelting, the composition of waste acid: Cu 1.5g / L, As1.09g / L, Re 0.022g / L, H 2 SO 4 300g / L. Put 1 liter of waste acid in a container, turn on the stirrer, heat the waste acid to 80°C, add the corresponding amount of sodium thiosulfate according to twice the amount of copper in the waste acid, react for 1 hour, filter, and separate the solid and liquid , the decopper tail liquid enters the rhenium extraction process, and the filter residue can be returned to the copper smelting system.

[0051] The filtrate is copper removal tail liquid, tail liquid composition: Cu 0.038g / L, As 1.09g / L, Re0.021g / L, H 2 SO 4 300g / L. The filter cake contains 57.23% copper and 0.005% rhenium. Calculated according to the components of waste acid stock solution and decopper tail liquid, the copper recovery rate is 97.46%, the rhenium recovery rate is 95.4%, and arsenic does not precipitate during the copper remo...

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Abstract

The invention provides a method for recycling rhenium from copper smelting waste acid. The method comprises the following steps of: adding thiosulfate into the copper smelting waste acid, filtering after a reaction is finished, and taking the filter residues as rhenium-rich concentrates. According to the method for recycling rhenium, provided by the invention, the rhenium is recycled from the waste acid by using thiosulfate, so that the recycling rate is high, and the economic value is obvious. An optimized implementation manner is as follows: under a high copper condition (copper concentration is 0.2-50 g / L), the characteristic of a strong binding capacity between the thiosulfate and copper ions is used, and the operations of removing copper and extracting rhenium are carried out step by step; copper removal pretreatment is carried out on the waste acid, so that the copper is recycled; the rhenium is precipitated in the liquid after copper removal, so that the rhenium-rich concentrates are generated, therefore the purpose of comprehensively recycling copper and rhenium is achieved, the recycling rate is high, the economic value is obvious, and other heavy metals are rarely separated out or slightly separated out in the whole treatment process; and especially, the separate-out quantity of arsenic is very low, so that the subsequent treatment of the waste acid is not affected.

Description

technical field [0001] The invention relates to the field of metal refining, in particular to a method for recovering rhenium from copper smelting waste acid. Background technique [0002] As a precious rare metal, rhenium is mainly used in petroleum cracking catalysts, high-temperature instrument materials, and aerospace materials. Rhenium exists in the form of rhenium sulfide in nature. The content of rhenium in the earth's crust is extremely low, and there is no separate deposit itself. It is mainly associated with molybdenite, and a small amount is associated with copper sulfide ore. During copper smelting, rhenium sulfide is oxidized at high temperature to generate volatile Re 2 o 7 Enter the flue gas, and finally exist in the flue gas washing liquid in the form of perrhenic acid, that is, the waste acid of copper smelting. [0003] Copper smelting waste acid uses sulfuric acid as the acidic medium, and contains a wide variety of heavy metals, including copper, arsen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B61/00C22B7/00
CPCY02P10/20
Inventor 周松林陈一恒
Owner YANGGU XIANGGUANG COPPER
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