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Method for recycling indium and germanium from alkali slag

A slag and alkaline technology, applied in the field of metallurgy and chemical industry, can solve the problems of uneconomical, complex process operation, and the recovery rate cannot meet the requirements, and achieve the effect of reducing production costs.

Active Publication Date: 2013-07-10
YANGZHOU NINGDA NOBLE METAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly aimed at materials with relatively high indium and germanium such as indium germanium dust, indium germanium precipitate, zinc oxide ash, lead scum, etc. The treatment of alkaline sludge has the following disadvantages: (1) because the sludge is alkaline, acid High consumption; (2) Due to the low content of indium and germanium, the content of indium and germanium in the leaching solution is low, and the extraction cost is high
(3) Due to the high and complex content of impurities, it is difficult to purify the leachate, and it is easy to cause the emulsification of the extractant and the appearance of the third phase
(4) Due to the long process, the recovery rate of indium and germanium is low
Judging from the above methods of enriching indium or germanium, they are all configured as a follow-up to the pyrometallurgy process to increase the recovery rate of the main metal and to recover indium and germanium. Disadvantages such as failure to meet requirements, high cost and uneconomical, large equipment investment, complicated process operation, etc.

Method used

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Embodiment Construction

[0030] Operation steps: neutralization washing, drying, dough making, high temperature reduction volatilization, oxidation, dust collection.

[0031] 1. Neutralization and washing: The alkaline residue is neutralized to pH 7.0 with germanium distillation waste acid under stirring conditions, and the filter cake after pressure filtration is washed twice with the cooling water of the volatilization furnace as washing water. Wherein, the liquid-solid volume ratio of washing is 3:1, and the temperature of washing water is 60-80°C.

[0032] 2. Drying: the air inlet temperature is 200-250°C, and the moisture content in the germanium material after drying is 20-30%.

[0033] 3. Grouping: Mix the dried germanium material with white coal powder and wood chips evenly, and then press it into cakes. The mass ratio of germanium material to white coal powder and sawdust is 100:40:1, and the cake contains 0.5-1.0% zinc.

[0034]4. High-temperature reduction and volatilization: divided into...

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Abstract

The invention pertaining to the field of metallurgy and chemical industry technology provides a method of recovering indium and germanium from alkalescence smudgy slags.The method comprises processes of neutralizing, scouring, drying, briquetting, high-temperature reducing and volatilizing, oxidizing, dust collecting and the like. The method has advantages of simple technological operation, smallequipment investment, no-generation of secondary pollution and the like.

Description

technical field [0001] The invention relates to a method for simultaneously recovering indium and germanium from alkaline sludge. It belongs to the technical field of metallurgy and chemical industry. Background technique [0002] Alkaline sludge is filter residue after alkali neutralization treatment of mixed wastewater in the production process of germanium and indium. Its characteristics are: (1) strong alkalinity (free alkali content greater than 1%); (2) complex composition: high water content (greater than 70%), but low indium germanium content (indium germanium less than 1000g / t), At the same time, it contains tin, antimony, bismuth, lead, zinc, arsenic, magnesium, aluminum, silicon and other impurities. Therefore, it is technically difficult and uneconomical to recover indium germanium by conventional methods. [0003] The typical method for comprehensive recovery of indium and germanium from waste residue is leaching—extracting indium—extracting germanium, that i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B5/00C22B1/14C22B41/00C22B58/00
CPCY02P10/20
Inventor 樊红杰
Owner YANGZHOU NINGDA NOBLE METAL CO LTD
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