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Method for pretreating indium-containing zinc oxide acid supernatant

A zinc oxide and pretreatment technology, applied in the direction of improving process efficiency, can solve the problems of inability to carry out extraction and high impurity content, and achieve the effects of simplifying indium recovery process, improving indium recovery rate, and reducing consumption

Active Publication Date: 2013-04-17
ZHUZHOU SMELTER GRP
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  • Description
  • Claims
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Problems solved by technology

[0005] The invention solves the technical problem that the high impurity content in the direct extraction of the indium-containing zinc oxide supernatant in the prior art leads to the inability to carry out the extraction, and provides a pretreatment method for the indium-containing zinc oxide supernatant

Method used

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  • Method for pretreating indium-containing zinc oxide acid supernatant

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Embodiment 1

[0044] The composition of the indium-containing zinc oxide supernatant of the present invention is: In 3+ 0.92g / L, Bi 3+ 0.12g / L, Sn 2+ 0.11g / L, SiO 2 0.36g / L, Fe 2+ 20.83g / L, Fe 3+ 23.71g / L, Cu 2+ 0.73g / L, Zn 2+ 87.36g / L, As 3+ 1.59g / L, Cl - 0.89g / L,H 2 SO 4 71.53g / L.

[0045] Step 1: Reduction: Add the zinc sulfide concentrate after ball milling to the constantly stirring indium-containing zinc oxide supernatant, and the addition amount of the zinc sulfide concentrate is Fe 3+ All reduced to Fe 2+ The theoretical dosage is 1.0 times, the reduction temperature is 95°C, and the time is 2 hours. After filtration, the reduction solution and reduction slag are obtained, and the reduction slag returns to the zinc system to recover zinc. The main components of the reducing solution are: In 3+ 0.91g / L, Fe 2+ 40.15g / L, Fe 3+ 4.78g / L, Zn 2+ 98.35g / L, Bi 3+ 0.13g / L, Sn 2+ 0.11g / L, SiO 2 0.34g / L, Cu 2+ 0.78g / L, As 3+ 1.51g / L, Cl - 0.93g / L,H 2 SO ...

Embodiment 2

[0051] The composition of the supernatant containing indium zinc oxide acid of the present embodiment is: In 3+ 0.92g / L, Bi 3+ 0.12g / L, Sn 2+ 0.11g / L, SiO 2 0.36g / L, Fe 2+ 20.83g / L, Fe 3+ 23.71g / L, Cu 2+ 0.73g / L, Zn 2+ 87.36g / L, As 3+ 1.59g / L, Cl - 0.89g / L,H 2 SO 4 71.53g / L.

[0052] Step 1: Reduction: Add the zinc sulfide concentrate after ball milling to the constantly stirring indium-containing zinc oxide supernatant, and the addition amount of the zinc sulfide concentrate is Fe 3+ All reduced to Fe 2+ The theoretical dosage is 1.2 times, the reduction temperature is 85°C, and the time is 3.5 hours. After filtration, the reduction solution and reduction residue are obtained, and the reduction residue zinc return system recovers zinc. The main components of the reducing solution are: In 3+ 0.91g / L, Fe 2+ 41.08g / L, Fe 3+ 3.92g / L, Zn 2+ 99.15g / L, Bi 3+ 0.13g / L, Sn 2+ 0.12g / L, SiO 2 0.38g / L, Cu 2+ 0.81g / L, As 3+ 1.65g / L, Cl - 0.97g / L,H ...

Embodiment 3

[0058] The composition of the supernatant containing indium zinc oxide acid of the present embodiment is: In 3+ 0.92g / L, Bi 3+ 0.12g / L, Sn 2+ 0.11g / L, SiO 2 0.36g / L, Fe 2+ 20.83g / L, Fe 3+ 23.71g / L, Cu 2+ 0.73g / L, Zn 2+ 87.36g / L, As 3+ 1.59g / L, Cl - 0.89g / L,H 2 SO 4 71.53g / L.

[0059] Step 1: Reduction: Add the zinc sulfide concentrate after ball milling to the constantly stirring indium-containing zinc oxide supernatant, and the addition amount of the zinc sulfide concentrate is Fe 3+ All reduced to Fe 2+ The theoretical dosage is 1.3 times, the reduction temperature is 75°C, and the time is 5 hours. After filtration, the reduction solution and reduction slag are obtained, and the reduction slag returns to the zinc system to recover zinc. The main components of the reducing solution are: In 3+ 0.90g / L,Fe 2+ 41.54g / L, Fe 3+ 3.16g / L, Zn 2+ 99.83g / L, Bi 3+ 0.14g / L, Sn 2+ 0.13g / L, SiO 2 0.41g / L, Cu 2+ 0.91g / L, As 3+ 1.64g / L, Cl - 0.98g / L,H ...

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Abstract

The invention provides a method for pretreating indium-containing zinc oxide acid supernatant. The method comprises the following steps of: A, reducing, to be specific, adding ball-milled zinc sulfide concentrate into the indium-containing zinc oxide acid supernatant, reacting and then filtering to obtain a reducing solution; B, purifying, to be specific, adding iron powder in the reducing solution, qualitatively detecting until the content of Fe<3+> in the reducing solution is qualified, thus obtaining a purifying solution; C, carrying out desilicication, to be specific, adding bone glue in the purifying solution to obtain a desilicication solution; D, deoiling, to be specific, adding a deoiling agent into the desilicication solution to obtain a deoiling solution; and E, regulating acidicity and the zinc ion concentration and filtering, to be specific, adding sulfuric acid and water in the deoiling solution until the system acidicity and the zinc ion concentration reach the extraction requirements, then filtering to obtain a pretreating solution and pretreating slag. According to the method for pretreating the indium-containing zinc oxide acid supernatant, impurities in the indium-containing zinc oxide acid supernatant, which influence the indium extraction, can be removed so that a pre-extraction feed liquid suitable for direct extraction of indium is obtained; and meanwhile, valuable metals such as bismuth, copper and tin are enriched.

Description

technical field [0001] The invention relates to a method for comprehensively recovering indium from zinc oxide in a zinc hydrometallurgy process, in particular to a pretreatment method for the supernatant of zinc oxide containing indium. Background technique [0002] Generally speaking, in the existing zinc hydrometallurgy process, there are two main processes for recovering indium from zinc oxide by wet method: one is to directly leaching zinc oxide with low-acid to enrich indium from the low-acid leaching solution, Generate enriched slag, and then use alkali boiling→acid dissolution→replacement→melting and casting to obtain crude indium, and electrolysis of crude indium to obtain refined indium. This process has the disadvantages of long process, high labor intensity, high unit production cost and low indium recovery rate. The other method is neutral leaching of indium-containing zinc oxide (neutral leaching means that the pH value of the leaching end point is around 5.0, ...

Claims

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Application Information

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IPC IPC(8): C22B3/24C22B3/44C22B19/00C22B58/00
CPCY02P10/20
Inventor 刘一宁廖贻鹏刘敏窦传龙周正军王文录王荣辉
Owner ZHUZHOU SMELTER GRP
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