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A method for leaching germanium from germanium chloride distillation calcium slag

A technology of chlorinated distillation and calcium slag, applied in the field of hydrometallurgy, can solve the problems of waste of resources, corrosion of volatilization furnace, high cost, and achieve the effect of avoiding the generation of silica gel, reducing consumption and efficient recovery

Active Publication Date: 2021-01-05
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of using the rotary kiln to volatilize has problems such as low germanium recovery rate and serious corrosion to the volatilization furnace; the use of wet multiple alkali leaching-tannin precipitation method for recovery has problems such as high alkali consumption, high cost, and low germanium recovery rate.
Therefore, germanium smelting enterprises usually stockpile the chlorinated distillation slag, causing environmental pollution and waste of resources

Method used

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  • A method for leaching germanium from germanium chloride distillation calcium slag

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The main components of the germanium chloride distillation calcium slag used in this embodiment are Ca: 15.20%, Si: 24.30%, Pb: 6.83%, S: 8.65%, and Ge: 0.85% in mass percentage. Industrial grade sulfuric acid, where H 2 SO 4 ≥98%; industrial grade sodium carbonate, of which Na 2 CO 3 ≥98%.

[0053] This embodiment provides a method for leaching germanium from germanium chloride distillation calcium slag, which includes:

[0054] S1: Weigh 400g of calcium slag from germanium chloride distillation and 200g of sodium carbonate, mix it evenly, put it into the furnace, roast it at 800°C for 3 hours, and get 484.0g of calcined sand and 31.2g of dust after cooling;

[0055] S2: immerse 484.0 g of calcined sand obtained after roasting in water, control liquid-solid ratio to 8 mL / g, temperature at 40°C, leaching time for 3 hours, stirring speed at 500 rpm, and filter to obtain 242.0 g of water-leaching residue after leaching;

[0056] S3: Leach 242.0g water leaching residu...

experiment example 1

[0058] The Ge content in the sulfuric acid leaching slag provided by Analysis Example 1 was 0.30%, and the Ge leaching rate was 92.2%.

Embodiment 2

[0060] The main components of the germanium chloride distillation calcium slag used in this embodiment are Ca: 9.20%, Si: 16.80%, Pb: 8.93%, S: 5.45%, and Ge: 0.74% in mass percentage. Industrial grade sulfuric acid, where H 2 SO 4 ≥98%; industrial grade sodium carbonate, of which Na 2 CO 3 ≥98%.

[0061] This embodiment provides a method for leaching germanium from germanium chloride distillation calcium slag, which includes:

[0062] S1: Weigh 600g of calcium slag from germanium chloride distillation and mix it evenly with 300g of sodium carbonate, put it into the furnace, roast it at 900°C for 2 hours, and get 748.5g of calcined sand and 59.4g of soot after cooling.

[0063] S2: Soak 748.5g of calcined sand obtained after calcination in water, control liquid-solid ratio to 6mL / g, temperature at 50°C, leaching time for 2h, stirring speed at 400rpm, filter after leaching to obtain 331.3g of water-leaching residue.

[0064] S3: Leach 313.3g water leaching residue and 59.4...

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Abstract

The invention discloses a method for leaching out germanium from germanium chlorination distilled calcium slag and relates to the technical field of wet metallurgy. According to the method, at first,the germanium chlorination distilled calcium slag and sodium carbonate are mixed and then roasted at certain temperature, calcium sulfate, silicon dioxide and silicon germinate in the germanium chlorination distilled calcium slag are converted into calcium carbonate, sodium silicate and sodium germinate correspondingly; wrapping of calcium sulfate and silicon dioxide to germanium is opened, and follow-up leaching out of germanium is benefitted; secondly, water is adopted for leaching out a roasted product, sodium sulfate, sodium silicate and sodium germinate enter a water solution, and the situation that silica gel is formed in the follow-up sulfuric acid leaching out process is avoided; and finally, under the condition of low sulfuric acid concentration, efficient leaching out of germanium is achieved, efficient recovery of valuable resources can be achieved, meanwhile, consumption of sulfuric acid is reduced, and generation of silica gel in the leaching out process is avoided.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, and in particular to a method for leaching germanium from calcium slag of germanium chloride distillation. Background technique [0002] Germanium is an important rare metal, which has very important applications in the fields of semiconductor materials, infrared optics, PET chemical catalysts, new energy, and daily health care products. [0003] Germanium is mainly distributed in minerals composed of other elements in a dispersed state in nature, and is usually regarded as an associated component of polymetallic deposits, and the probability of forming independent minerals is very low. Germanium mainly comes from two types of deposits as a by-product; some sulfide-rich Pb, Zn, Cu, Ag, Au deposits and some coal mines; both exist as associated components. Therefore, the raw materials for extracting germanium are mainly by-products produced in the production process of non-ferrous and ferr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B41/00
CPCY02P10/20
Inventor 饶帅王东兴周庆段丽娟曹洪杨刘志强郭秋松
Owner GUANGDONG INST OF RARE METALS
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