A comprehensive recovery method for flotation of silver concentrate with zinc hydrometallurgy acid leaching slag

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 problems such as the preparation of iron phosphate that has not been seen, and achieve the reduction of outsourcing, simple and easy process, The effect of reducing production costs

Active Publication Date: 2022-06-07
ZHUZHOU SMELTER GRP
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  • Summary
  • 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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  • A comprehensive recovery method for flotation of silver concentrate with zinc hydrometallurgy acid leaching slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A. Activated reduction dezincification: mix the silver concentrate pulp obtained by flotation of the acid leaching residue of hydrometallurgy zinc and the zinc electrolysis waste liquid in the leaching tank at a volume ratio of 1:1.2, and place the plate with pinholes at the bottom of the leaching tank. The flue gas after roasting in the boiling furnace of zinc concentrate and after dust collection treatment is slowly introduced 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 end point acidity is 10g / L.

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

Embodiment 2

[0048] A. Activated reduction dezincification: Mix the silver concentrate slurry obtained by flotation of the acid leaching residue of hydrometallurgy zinc and the zinc electrolysis waste liquid in the leaching tank at a volume ratio of 1:1.8, and place the plate with pinholes at the bottom of the leaching tank. The flue gas after roasting in the boiling furnace of zinc concentrate and after dust collection is slowly passed into the pipe, the dezincification temperature is 75℃, 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 endpoint acidity is controlled at 25g / L.

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

Embodiment 3

[0054] A. Activated reduction dezincification: Mix the silver concentrate pulp obtained by the flotation of the acid leaching residue of hydrometallurgy zinc and the zinc electrolysis waste liquid in the leaching tank in a volume ratio of 1:1.5, and place a plate with pinholes at the bottom of the leaching tank. The flue gas after roasting in the boiling furnace of zinc concentrate and after dust collection treatment is slowly passed into the pipe, the dezincification temperature is 80 °C, the dezincification time is 6 hours, and the amount of sulfur dioxide introduced is 1.5 × 10 -2 mol / g, Mn in zinc electrolysis waste solution 2+ The content is 8g / L, and the end point acidity is controlled at 15g / L.

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

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Abstract

A method for comprehensive recovery of silver concentrate by hydrometallurgy acid leaching slag flotation, comprising the following steps: A. Activation reduction dezincification: mixing the silver concentrate slurry and zinc electrolysis waste liquid in the leaching tank, and pouring to the bottom of the leaching tank Feed into the flue gas after roasting in the zinc concentrate fluidized bed furnace and after dust collection; B, goethite method for iron precipitation: use the leachate obtained in step A to use the goethite method for iron precipitation; C, reduction leaching and purification: for step The goethite slag obtained in B is reductively leached, and at the end of the leaching, a purifying agent is added and the pH is adjusted to obtain a purifying solution. D. Purification solution synthesis: Slowly add phosphate and oxidant to the purification solution obtained in step C to obtain iron phosphate. The method of the invention has the advantages of reasonable process, low separation cost, no pollution, no toxicity, etc. The obtained iron-precipitated liquid can be used as a raw material for wet zinc smelting, and the iron phosphate can be used as a raw material for lithium iron phosphate, a positive electrode material of a lithium ion battery.

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 of silver concentrate from acid leaching slag of hydrometallurgy zinc. Background technique [0002] The zinc concentrate containing about 0.015% silver (wt%) is obtained by roasting and two-stage leaching to obtain acid leaching slag. The contents (wt%) of zinc, iron and copper are respectively 0.28-0.35%, 17-25%, 31-37% and 0.6-1.2%, wherein zinc mainly exists in the form of zinc ferrite. When the silver concentrate is directly sold to lead smelters to recover silver, because the silver content in the silver concentrate is low, the silver pricing coefficient is low, and valuable metals such as zinc and copper are not priced, causing huge economic losses to the company; In the smelting process, due to the high zinc content, it is difficult to separate the matte from the slag in the smelting process, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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