Metho of recovering valuable metal in gold silver smelting furance waste lining brick

A technology of valuable metals and smelting furnaces, applied in the field of recycling various valuable metals, can solve problems such as difficult purification, long time required for carbonate conversion, complicated process, etc., and achieve the effect of reducing pollution

Inactive Publication Date: 2007-04-18

LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY +1

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AI-Extracted Technical Summary

Problems solved by technology

Another major problem is that although 96% of the precious metals have been enriched through re-election and flotation, 4% of the precious metals remain in the flotation tailings. Compared with ordinary precious metal mines, the flotation tailings Gold and ...

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Abstract

A method to recover valuable metal from abandoned bricks by lines of gold and silver smelting, whose craft steps are as follows: de-magging from extraction of sulfuric acid, deprivation of lead sulfate etching by alkali, silver etching by nitric acid and gold etching by aqua regia. The process of de-magging from extraction of sulfuric acid is that: 200kg bricks powder of abandoned magnesia-chrome from lines of gold and silver smelting is stirred with 1350kg dilute sulfuric acid. The mixture reacts for 2 to 3 hours, and discharges clear MgSO4 strong solution. 100kg water is filled into extraction slot. Based on stirring, 25ppm flocculant is added and stewed for 10 minutes. After discharging MgSO4 solution, 1000kg is filled into extraction slot and filtrated to get MgSO4 wet materials. Then, it is neutralized with light-burned magnesia to achieve magnesium sulphate. Valuable metals including magnesium, lead, silver, gold and copper etc. can be recovered from abandoned bricks by lines of gold and silver smelting. Deposits including Cr(OH)3, Fe(OH)3, Cu(OH)2 and Al(OH)3 can be gathered for producing refractory materials, which realizes salvaging and reduces environmental pollution.

Application Domain

Process efficiency improvement

Technology Topic

EtchingHeavy metals +13

Examples

Experimental program(1)

Example Embodiment

[0023] Example one

[0024] At 4.5m 3 Prepare 1350 kilograms of 26% sulfuric acid aqueous solution in the leaching tank, slowly add 200 kilograms of ground waste brick powder under vigorous stirring, and complete the addition within 0.5h to 1.0h. Continue the reaction for 2h to 3h, exothermic reaction, the temperature remains constant Maintain 80℃~100℃, then stop stirring, let stand and settle for 8h~12h, use siphon with float to discharge clear MgSO 4 Concentrated solution. Add 1000 kg of clean water to the leaching tank pulp to dilute, add 25ppm of polyacrylamide flocculant under stirring conditions, and then let it settle for 10min~20min, siphon out the clarified MgSO 4 Solution. Then add 1000 kg of clean water to the leaching tank slurry, filter and wash after stirring, to obtain 74 kg of wet material with 47% water content;

[0025] Combine the above-mentioned magnesium sulfate solutions and neutralize with light-burned magnesium oxide powder to adjust the pH to 6-7. At this time, Cr(OH) 3 Completely precipitated out, a trace amount of Fe(OH) 3 , Cu(OH) 2 And Al(OH) 3It also completely settled out. These precipitates were filtered out, and MgSO was removed by distillation under reduced pressure at 60°C. 4 The solution was concentrated to a density of 1.38g/mL, cooled and crystallized to obtain magnesium sulfate heptahydrate with a purity of 98.5%, and the remaining MgSO 4 Apply the solution to the next leaching solution;

[0026] At 1.5m 3 Prepare 350 kilograms of 20% sodium hydroxide aqueous solution in the leaching tank, slowly add 74 kilograms of sulfuric acid demagnesium wet material under strong stirring, control the temperature at 60℃~80℃, stir for 2h~3h, stand for 4h, siphon Drain the supernatant. Add 500 kg of clean water to the leaching tank slurry for dilution, and siphon out the supernatant after settling. Filter and wash to obtain 52 kg of wet material with 45% water content. Combine the above filtrate and supernatant and adjust to neutral, PbSO 4 Precipitate, separate and dry to obtain PbSO with a purity of 98.5% 4 Product 21.5 kg;

[0027] Add the above 52 kg of wet material after de-lead into 1.0m 3 In the leaching tank, add 100 kg of 30% nitric acid, stirring intermittently, leaching at room temperature for 10 hours, adding 500 kg of clear water to the leaching tank for dilution, and siphoning out the supernatant after settling. Filter and wash the leaching residue with 500 kg of water four times to obtain 19 kg of nitric acid leaching residue. Combine the supernatant and the filtrate, add 6 kg of NaCl to obtain 12.46 kg of silver chloride, containing 9.377 kg of silver, add reduced iron powder to the silver immersion liquid to replace the copper, and the direct yield of copper is 75%;

[0028] Add 30 kg of aqua regia with a volume ratio of 1:1 to the above 19 kg of nitric acid leaching residue, stirring intermittently, leaching at room temperature for 10 hours, and adding 100 kg of clear water to the leaching tank for dilution. Filter, wash the leaching residue with 100 kg of water four times, combine the filtrates, adjust the pH to 1-2, and reduce with sodium sulfite to obtain 22 g of gold powder with a grade of 99.8%.

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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Reduce pollution

Metho of recovering valuable metal in gold silver smelting furance waste lining brick

A technology of valuable metals and smelting furnaces, applied in the field of recycling various valuable metals, can solve problems such as difficult purification, long time required for carbonate conversion, complicated process, etc., and achieve the effect of reducing pollution

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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