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Process for improving germanium recovery rate of electro-zinc system

A recovery rate and electro-zinc technology is applied in the technical field of improving germanium recovery rate of electro-zinc system, which can solve the problems of high production cost, low direct yield, large consumption of zinc powder, etc. effect of science

Inactive Publication Date: 2018-10-30
四川四环锌锗科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the tannic acid precipitation process is simple in operation and high in efficiency, the output of tannic acid is limited, the price is high, and the direct recovery rate of germanium is low, about 60%.
If the zinc powder reduction combined extraction method is adopted, the consumption of zinc powder is large, the leaching rate of replacement slag is low, the direct recovery rate of germanium is low, and the production cost is high

Method used

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  • Process for improving germanium recovery rate of electro-zinc system
  • Process for improving germanium recovery rate of electro-zinc system
  • Process for improving germanium recovery rate of electro-zinc system

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Effect test

Embodiment 1

[0029] The present embodiment provides a kind of technique that improves the recovery rate of germanium of electric zinc system, comprises the following steps:

[0030] (1) In the rotary kiln, feed sand coal and zinc leached slag according to the mass ratio of 11:89, and carry out rotary treatment to obtain germanium-containing zinc oxide smoke; (2) control the iron content in the germanium-containing zinc oxide smoke to be 0.5g / L, germanium-containing zinc oxide smoke dust is under the condition of 85 ℃, and the control end point pH is 5.3, carries out neutral leaching 3h, obtains leachate; Add iron powder to the mixture, and filter to obtain high-germanium slag; (4) low-leach high-germanium slag to obtain low-leaching solution; (5) carry out germanium-precipitation with tannic acid at pH 2.4 and 55°C for 30 minutes to obtain Crude tannin germanium; the mass ratio of germanium content to tannic acid in the low leaching solution is 1:25; (6) the crude tannin germanium is wash...

Embodiment 2

[0032] The present embodiment provides a kind of technique that improves the recovery rate of germanium of electric zinc system, comprises the following steps:

[0033] (1) In the rotary kiln, feed sand coal and zinc leached slag according to the mass ratio of 15:85, and carry out rotary treatment to obtain germanium-containing zinc oxide smoke; (2) control the iron content in the germanium-containing zinc oxide smoke to be 0.5g / L, germanium-containing zinc oxide smoke dust is under the condition of 85 ℃, and the control end point pH is 5.3, carries out neutral leaching 3h, obtains leachate; Add iron powder to the mixture, and filter to obtain high-germanium slag; (4) low-leach high-germanium slag to obtain low-leaching solution; (5) carry out germanium-precipitation with tannic acid at pH 2.4 and 55°C for 30 minutes to obtain Crude tannin germanium; the mass ratio of germanium content to tannic acid in the low leaching solution is 1:25; (6) the crude tannin germanium is wash...

Embodiment 3

[0035] The present embodiment provides a kind of technique that improves the recovery rate of germanium of electric zinc system, comprises the following steps:

[0036] (1) Feed coke powder and zinc leached slag into the rotary kiln according to the mass ratio of 13:87, and carry out rotary treatment to obtain germanium-containing zinc oxide smoke; (2) control the iron content in the germanium-containing zinc oxide smoke to be 0.5g / L, germanium-containing zinc oxide smoke dust is under the condition of 85 ℃, and the control end point pH is 5.3, carries out neutral leaching 3h, obtains leachate; Add iron powder to the mixture, and filter to obtain high-germanium slag; (4) low-leach high-germanium slag to obtain low-leaching solution; (5) carry out germanium-precipitation with tannic acid at pH 2.4 and 55°C for 30 minutes to obtain Crude tannin germanium; the mass ratio of germanium content to tannic acid in the low leaching solution is 1:25; (6) the crude tannin germanium is w...

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Abstract

The invention belongs to the technical field of zinc smelting germanium recovery, and provides a process for improving the germanium recovery rate of an electro-zinc system. The process comprises thefollowing steps that (1) a reducing agent and zinc leaching slag are introduced into a rotary kiln, and rotary treatment is carried out to obtain germanium-containing zinc oxide smoke dust; (2) neutral leaching is carried out on the germanium-containing zinc oxide smoke dust to obtain a leaching solution; (3) iron powder is added into the leaching solution, and filtering is carried out to obtain high-germanium slag; (4) low-leaching is carried out on the high-germanium slag to obtain a low-leaching solution; (5) germanium precipitation is carried out on the low-leaching solution and tannic acid so as to obtain crude tannin germanium; and (6) the crude tannin germanium is washed to obtain a washing solution and a refined tannin germanium, the washing solution is fed back to the low-leachingsolution, and desulfurization and decarbonization are carried out on the refined tannin germanium to obtain germanium concentrate. The process is scientific in design, capable of conveniently realizing large-scale industrial production and capable of remarkably improving the recovery rate and the grade of germanium.

Description

technical field [0001] The invention belongs to the technical field of germanium recovery in zinc smelting, and in particular relates to a process for improving the recovery rate of germanium in an electric zinc system. Background technique [0002] In zinc hydrometallurgy, germanium is one of the most harmful impurities, which will seriously affect the current efficiency. Generally speaking, the content of germanium in the solution needs to be reduced to below 0.05mg / L to meet the quality requirements of the new solution in the electrolysis process. . At the same time, germanium is a rare metal element with great recycling value and needs to be recycled. [0003] At present, the enrichment and recovery of germanium in several of the largest germanium production units in China all use zinc oxide fume acid leaching and then precipitation with tannic acid. Although the tannic acid precipitation process is simple in operation and high in efficiency, the output of tannic acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/00C22B3/46C22B3/44C22B41/00
CPCC22B1/005C22B3/44C22B3/46C22B7/001C22B7/007C22B41/00Y02P10/20
Inventor 曾维泉
Owner 四川四环锌锗科技有限公司
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