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Method for extracting rhenium from copper smelting flue gas wet dust collecting liquid

A technology of wet dust collection and copper smelting, applied in the direction of improving process efficiency, etc., can solve the problems of high secondary disposal costs, high operating costs, and large investment, and achieve the effects of easy implementation, low production costs, and high concentration

Inactive Publication Date: 2016-01-27
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are that the primary enrichment of rhenium by ion exchange method requires the construction of huge ion exchange equipment, large investment and high operating costs, and the amount of regeneration waste generated during regeneration of the ion exchange column is almost equal to the amount of waste acid treated. The secondary disposal cost of liquid is also very high

Method used

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  • Method for extracting rhenium from copper smelting flue gas wet dust collecting liquid
  • Method for extracting rhenium from copper smelting flue gas wet dust collecting liquid
  • Method for extracting rhenium from copper smelting flue gas wet dust collecting liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The composition of the wet dust collection liquid produced by a certain process of a copper production enterprise is shown in Table 1. The wet dust collection liquid from copper smelting flue gas is placed in a stirring tank, and a 20% sodium thiosulfate solution is added. To precipitate rhenate ions, the amount of sodium thiosulfate solution added is 100 times the theoretical amount of rhenium in the dust collection liquid. The precipitation reaction time is 3.0 hours, and the reaction temperature is 40°C. After the precipitation reaction, filter to obtain precipitated rhenium slag and precipitated rhenium After liquid, the liquid after sinking rhenium is returned to the waste acid water treatment system, and the rhenium sinking slag is selectively leached rhenium in two stages at normal pressure. The composition of the sinking rhenium slag produced is shown in Table 2.

[0021] Table 1 Composition of wet dust collection fluid / g / L

[0022]

[0023] Table 2 Typical c...

Embodiment 2

[0032] The composition of the wet dust collection liquid produced by a certain process of a copper production enterprise is shown in Table 5. The wet dust collection liquid from copper smelting flue gas is placed in a stirring tank, and a sodium thiosulfate solution with a mass concentration of 32% is added. To precipitate rhenate ions, the amount of sodium thiosulfate solution added is 150 times the theoretical amount of rhenium in the dust collection liquid. The precipitation reaction time is 4.0 h, and the reaction temperature is 30°C. The composition of the precipitated rhenium slag is shown in Table 6.

[0033] Table 5 Composition of wet dust collection fluid / g / L

[0034]

[0035] Table 6 Typical composition (%) of precipitated rhenium slag

[0036]

[0037] Weigh 500g of the sinking rhenium slag in Table 6, first adopt one stage of normal pressure leaching, the liquid before leaching is the second stage of normal pressure leaching liquid, the leaching process is pa...

Embodiment 3

[0044] The composition of the wet dust collection liquid produced by a certain process of a copper production enterprise is shown in Table 9. The wet dust collection liquid from copper smelting flue gas is placed in a stirring tank, and a 40% sodium thiosulfate solution is added. To precipitate rhenate ions, the amount of sodium thiosulfate solution added is 255 times the theoretical amount of rhenium in the dust collection solution. The precipitation reaction time is 4.0 h, and the reaction temperature is 50°C. The composition of the precipitated rhenium slag is shown in Table 10.

[0045] Table 9 Composition of wet dust collection fluid / g / L

[0046]

[0047] Table 10 Typical composition of rhenium slag (%)

[0048]

[0049]Weigh 500g of the sinking rhenium slag in Table 10, first adopt one stage of normal pressure leaching, the liquid before leaching is the second stage of normal pressure leaching liquid, the leaching process is passed through compressed air, the venti...

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Abstract

The invention provides a method for extracting rhenium from a copper smelting flue gas wet dust collecting liquid and relates to a method for selectively leaching rhenium by selectively enriching rhenium-rhenium precipitation slag from the copper smelting flue gas wet dust collecting liquid. The method comprises the following processing steps: firstly, the wet dust collecting waste liquid is put into a stirring tank, and a sodium thiosulfate solution is added to precipitate rhenate ions, wherein in the precipitation process, the generation of hydrogen sulfide can be effectively avoided, and the copper and the rhenium are selectively precipitated, while arsenic is less precipitated; secondly, the rhenium precipitation slag obtained through filtration after the precipitation reaction is subject to two-stage normal-pressure selective rhenium leaching, and the produced leachate is rich in rhenium and relatively low in impurity content; an amine extracting agent can be adopted for direct extraction to separate rhenium and for back extraction to obtain an ammonium rhenate solution high in concentration and purity. The method for extracting the rhenium from the wet dust collecting liquid is good in operating environment, simple in process and low in cost.

Description

technical field [0001] The invention belongs to the technical field of processing copper smelting flue gas, and in particular relates to a method for enriching and selectively leaching rhenium from copper smelting flue gas wet dust collection liquid. Background technique [0002] Rhenium is an extremely scarce and dispersed metal element with high value. Minerals containing rhenium are rare in nature, and most of them are associated with copper and molybdenum minerals in trace amounts. Domestic copper smelting enterprises mostly use wet methods produced from the smelting process. Rhenium is recovered and extracted from the dust collecting solution (also known as leaching waste acid). [0003] The rhenium content in the wet dust collection liquid is 1.5mg / L-80mg / L, and the sulfuric acid content is as high as 50-180g / L. Sodium sulfide is added to enrich the rhenium sulfide precipitate in the slag. The obtained rhenium sulfide slag mainly contains copper, arsenic, bismuth, rhe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B61/00
CPCY02P10/20
Inventor 杨志强刘玉强张晗李娟欧晓健张鹏樊昱王书友杨粉娟张素超刘广龙
Owner JINCHUAN GROUP LIMITED
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