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Method for extracting and separating indium and tin from indium-containing leaching residues

A technology of leaching slag and extraction, which is applied in the field of comprehensive metal recycling and smelting, can solve the problems of low recovery rate, high processing cost, and impact on environmental protection, and achieve the effect of high metal recovery, wide source of raw materials, and low cost

Inactive Publication Date: 2015-08-12
郴州雄风环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the purpose of not only obtaining electrolytic zinc but also recovering indium, germanium and gallium in the leaching slag of this process, and recovering indium tin at the same time, if the sulfuric acid method is used to extract indium: 1, the impurity components of the leachate are complex, and the treatment cost is high; 2. The raffinate is difficult Disposal affects environmental protection; 3. Low recovery rate; 4. Indium and tin are difficult to separate

Method used

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  • Method for extracting and separating indium and tin from indium-containing leaching residues

Examples

Experimental program
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Effect test

Embodiment 1

[0019] use NH 4 Re-extraction of Sn from P204 Supported Indium Tin with F+HCl

[0020] With 1.5mol / L NH 4 F+1mol / L HCl, according to O / A=3 / 1 back extraction 3 times. 3 times of stripping combined analysis of Sn 14.4g / L, In no color (no In). DescriptionNH 4 F+HCl only back-extracts tin, not indium. The organic phase after anti-tin was treated with 1mol / L H 2 S0 4 Washing, after thoroughly washing away the entrainment of the anti-tin solution in the negative indium organic phase, then use 6mol / L HCl to back-extract the indium, according to the ratio O / A=2 / 1 back-extraction 3 times, the 3-time stripping solution is combined and sampled Analysis: In0.51 g / L, Sn is colorimetric at 100ppm, no color (no Sn). Due to the 6-fold dilution of the stripping solution, the In concentration was very low. Moreover, when P204 extracts low-concentration In from a high-concentration Sn solution, much more Sn is extracted than In, but the effect of complete separation of indium and tin is ...

Embodiment 2

[0022] use NH 4 F+H 2 SO 4 Back extraction of tin from P204 loaded indium tin

[0023] With 2mol / L NH 4 F+0.5mol / L H 2 SO 4 Back-extract the tin in P204 loaded indium tin, according to the ratio O / A=2 / l, first strip for 5 minutes, clarify for 5 minutes to release the water phase pH2.5, analysis contains Sn 19.57 g / L, indium is not detected out. The second back-extraction was performed for 5 minutes, separated for 2 minutes, and the released water phase was analyzed to contain Sn6.25 g / L, and indium could not be detected. The third back-extraction was performed for 5 minutes, separated for 2 minutes, and the released aqueous phase was analyzed to contain Sn1.63 g / L, and indium could not be detected. For the fourth time, use 0.5mo 1 / L H 2 SO 4 Wash the organic phase according to the ratio O / A=2 / 1, the washing water contains Sn400ppm, and then use 6mol / L HCl to reverse the indium twice in the negative indium organic phase after pickling according to the ratio O / A=2 / 1, ...

Embodiment 3

[0025] Back-extraction of tin from P204 loaded indium tin with NaF

[0026] With 1.33mol / L NaF+0. 5mol / L H 2 SO 4 According to the comparison O / A=2 / 1 back extraction tin. The first stripping was carried out for 5 minutes, followed by clarification and phase separation in 1 minute, and the aqueous phase released in 5 minutes contained 10.87 g / L of Sn and no In was detected. The second stripping was carried out for 5 minutes, followed by clarification and phase separation in 1 minute, and the aqueous phase released in 5 minutes contained 9.5 g / L of Sn, and In was not detected.

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Abstract

The invention relates to a method for extracting and separating indium and tin from indium-containing leaching residues. The method comprises the following steps: leaching a complex middle-low grade zinc oxide material containing Cu, Pb, Zn and Ag by using a concentrated NH4Cl solution as a leaching agent to make zinc form a zinc ammonia complex solution; allowing all Fe, As, In and Sn elements in ores to enter residues; adding iron powder to the above obtained leached solution to remove bismuth, lead and iron; filtering to obtain a hydrochloric acid system solution containing indium and tin; and simultaneously extracting indium and tin by adopting P2O4, carrying out complexing stripping on tin by adopting fluoride, and stripping indium by adopting hydrochloric acid. The method has the advantages of one-time thorough separation of indium and tin, short flow, low cost, wide raw material source, high recovery rate of various metals, and no environmental protection problem, and allows the zinc recovery rate in the whole flow to reach above 95%.

Description

technical field [0001] The invention relates to metal comprehensive recovery and smelting technology, in particular to a method for extracting and separating indium tin from leaching slag containing indium. Background technique [0002] With the development and utilization of zinc ore resources at home and abroad, high-grade zinc sulfide ore resources are increasingly exhausted, and the development and processing of complex zinc sulfide ore and zinc oxide ore or low-grade zinc oxide ore has become inevitable. For high-grade zinc oxide ore, sulfuric acid leaching method is generally used at home and abroad to obtain leachate, and then conventional methods are used to obtain electrolytic zinc and appropriate recovery of rare and precious metals. For medium-low grade or complex zinc oxide ores, the smelter of Siskopion Zinc Mine of ZincOx abroad adopts solvent extraction-electrowinning (SX-EW) process to directly extract metallic zinc. In order to achieve the purpose of not on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B25/06C22B58/00
CPCY02P10/20
Inventor 雷日华谭雄玉刘小方张二军
Owner 郴州雄风环保科技有限公司
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