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Comprehensive recovery method for flotation of silver concentrate from zinc hydrometallurgy acid leaching residues

A technology of acid leaching and wet zinc smelting, which is applied in the direction of chemical instruments and methods, iron compounds, process efficiency improvement, etc., can solve the unseen problems of preparing iron phosphate, etc., reduce outsourcing, less investment, and improve comprehensive Effects of Recycling and Recycling

Active Publication Date: 2021-02-26
ZHUZHOU SMELTER GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above documents and patents on the preparation of iron phosphate and iron oxide, iron oxide, ferric chloride, iron nitrate, iron sulfate and other iron salts and phosphates are basically used, or ferrous sulfate, a by-product of titanium dioxide, is used as raw materials to produce iron oxide. Or ferric phosphate, so far, no relevant literature and patents have been seen on the use of zinc hydrometallurgy acidic leaching slag flotation silver concentrate to prepare ferric phosphate

Method used

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  • Comprehensive recovery method for flotation of silver concentrate from zinc hydrometallurgy acid leaching residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A. Activation-reduction dezincification: mix the silver concentrate slurry obtained by flotation of acidic leaching slag from wet smelting zinc and zinc electrolysis waste liquid in the leaching tank at a volume ratio of 1:1.2, and pour it to the plate with pinholes at the bottom of the leaching tank. The flue gas after the zinc concentrate fluidized furnace roasting and dust collection treatment is slowly passed into the pipe, the dezincification temperature is 90°C, the dezincification time is 12 hours, and the amount of sulfur dioxide introduced is 0.8×10 - 2 mol / g, Mn in zinc electrolysis waste solution 2+ The content is 12g / L, and the terminal acidity is 10g / L.

[0043] B. Goethite method for iron precipitation: the leaching solution obtained in step A is used for iron precipitation by goethite method, the oxidant is oxygen, pH=2.5, Fe in the solution after iron precipitation 全 =3g / L, end point of iron sinking Fe 2+ It is 1.0g / L, the iron precipitation temperatu...

Embodiment 2

[0048] A. Activation reduction dezincification: mix the silver concentrate slurry obtained by flotation of acidic leaching slag from wet smelting zinc and zinc electrolysis waste liquid in the leaching tank at a volume ratio of 1:1.8, and pour it into the plate with pinholes at the bottom of the leaching tank. The flue gas after the zinc concentrate fluidized furnace roasting and dust collection treatment is slowly introduced into the pipe, the dezincification temperature is 75°C, the dezincification time is 3 hours, and the amount of sulfur dioxide introduced is 2.5×10 - 2 mol / g, Mn in zinc electrolysis waste solution 2+ The content is 4g / L, and the terminal acidity is controlled at 25g / L.

[0049] B. Goethite method for iron precipitation: use the leach solution obtained in step A to use goethite method for iron precipitation, the oxidant is air, pH=2.8, Fe in the solution after iron precipitation 全 =5g / L, end point of iron sinking Fe 2+ It is 2.4g / L, the iron precipitati...

Embodiment 3

[0054] A. Activation reduction dezincification: mix the silver concentrate slurry obtained by flotation of acid leaching slag from wet smelting zinc electrolysis and zinc electrolysis waste liquid in the leaching tank at a volume ratio of 1:1.5, and pour it to the plate with pinholes at the bottom of the leaching tank. The flue gas after the zinc concentrate fluidized furnace roasting and dust collection treatment is slowly passed into the pipe, the dezincification temperature is 80°C, the dezincification time is 6 hours, and the sulfur dioxide feed rate is 1.5×10 - 2 mol / g, Mn in zinc electrolysis waste solution 2+ The content is 8g / L, and the terminal acidity is controlled at 15g / L.

[0055] B. Goethite method for iron precipitation: use the leach solution obtained in step A to use the goethite method for iron precipitation, the oxidant is 7 air, pH=2.7, Fe in the solution after iron precipitation 全 =4g / L, end point of iron sinking Fe 2+ It is 1.4g / L, the iron precipitati...

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Abstract

The invention discloses a comprehensive recovery method for flotation of silver concentrate from zinc hydrometallurgy acid leaching residues. The method comprises the following steps that A, activation reduction dezincification is conducted, specifically, silver concentrate pulp and zinc electrolysis waste liquid are mixed in a leaching tank, and flue gas obtained after roasting of a zinc concentrate fluidized bed furnace and dust collection treatment is introduced into the bottom of the leaching tank; B, iron precipitation is conducted through a goethite method, specifically, iron precipitation is conducted on the leachate obtained in the step A through the goethite method; C, reduction leaching and purification are conducted, specifically, reduction leaching is conducted on the goethiteslag obtained in the step B, a purifying agent is added at the leaching end point, pH is adjusted, and purified liquid is obtained; and D, purified liquid synthesis is conducted, specifically, phosphate and an oxidizing agent are slowly added into the purified liquid obtained in the step C to obtain iron phosphate. The method has the advantages of reasonable process, low separation cost, no pollution, no toxicity and the like, the obtained liquid after iron precipitation can be used as a raw material for zinc hydrometallurgy, and iron phosphate can be used as a raw material of a lithium ion battery cathode material lithium iron phosphate.

Description

technical field [0001] The invention relates to the technical fields of hydrometallurgy and chemical industry, in particular to a comprehensive recovery method for flotation silver concentrate with acid leaching slag from hydrometallurgy. Background technique [0002] Zinc concentrate containing about 0.015% silver (wt%) is obtained by roasting and two-stage leaching to obtain acid leaching slag. In order to recover silver, silver concentrate is obtained by flotation from zinc hydrometallurgy acid leaching slag. In silver concentrate, silver, The content (wt%) of zinc, iron and copper is 0.28-0.35%, 17-25%, 31-37%, and 0.6-1.2%, respectively, among which zinc mainly exists in the form of zinc ferrite. When the silver concentrate is directly sold to the lead smelter for recycling silver, the silver pricing coefficient is low due to the low silver content in the silver concentrate, and at the same time, valuable metals such as zinc and copper are not priced, causing huge econo...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B3/06C22B11/00C22B15/00C22B19/00C01G49/00
CPCC22B3/44C22B3/06C22B11/04C22B15/0089C22B19/26C01G49/00Y02P10/20
Inventor 廖贻鹏林文军王宏志唐亦秋陈敬阳
Owner ZHUZHOU SMELTER GRP
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