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Method for comprehensively recovering rare and dispersed noble metal from refining furnace slag

A technology of rare precious metals and slag, applied in the field of comprehensive recovery of scattered rare precious metals, can solve the problems of low direct recovery rate, large equipment investment, high toxic and harmful content, etc., and achieve the effect of simple process equipment, low energy consumption, and less three wastes

Inactive Publication Date: 2016-12-14
BEIJING GENERAL RES INST OF MINING & METALLURGY
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Problems solved by technology

The treatment of slag ash in the domestic smelting process mainly adopts fire smelting to produce alloys such as lead and bismuth, and then prepares refined bismuth by electrolytic precipitation-fire method-preparation of refined bismuth by acid dissolution to prepare bismuth oxide and other processes. This process is relatively mature, but it is also It has the disadvantages of large investment in equipment, large amount of smelting slag, low direct recovery rate and serious environmental pollution.
However, there are few studies on the domestic wet treatment of the associated rare metals such as bismuth and antimony in anode slime smelting slag, mainly due to the influence of factors such as the complex composition of anode slime smelting slag, difficulty in dissociation of scattered metals, and high toxic and harmful content.

Method used

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  • Method for comprehensively recovering rare and dispersed noble metal from refining furnace slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The chemical composition of typical smelting slag is shown in Table 1.

[0033] Table 1 Chemical composition of typical smelting slag

[0034] element

[0035] Finely grind the smelting slag to 50% less than 0.1mm, use HCl concentration of 1mol / L, FeCl 2 The concentration is 4mol / L, the liquid-solid ratio is 3:1, and the leaching temperature is 60°C for 3h; the leachate is 10g / L Fe(OH) at 20°C 2 Precipitate for 4 hours to obtain tin and antimony enrichment; after removing tin and antimony, replace bismuth with 1 times the theoretical amount of iron powder to obtain crude bismuth; After conversion at a ratio of 6:1, the concentration of nitric acid is 3mol / L, the temperature is 20°C, the time is 3h, and the liquid-solid ratio is 2:1 for leaching, so that lead enters the solution, and rare and precious metals such as gold and silver are further enriched in the slag. After analysis, the enrichment ratio of tin and antimony reached 14 times, and the precipitatio...

Embodiment 2

[0037] Finely grind the smelting slag to 50% less than 0.1mm, use HCl concentration of 1.5mol / L, ZnCl 2 The concentration is 3mol / L, the liquid-solid ratio is 4:1, and the leaching temperature is 100°C for 4 hours; the leachate is 20g / L Zn(OH) at 40°C 2 Precipitate for 3 hours to obtain tin-antimony enrichment; after removing tin and antimony, replace bismuth with 1.2 times the theoretical amount of zinc powder in the liquid to obtain crude bismuth; After conversion with a solid ratio of 2:1, the concentration of nitric acid is 1mol / L, the temperature is 80°C, the time is 0.5h, and the liquid-solid ratio is 6:1 for leaching, so that lead enters the solution, and rare and precious metals such as gold and silver are further enriched in the slag. After analysis, the enrichment ratio of tin and antimony reached 14.2 times, and the precipitation rate reached 99.9%; the leaching rate of bismuth was 99.7%, and the direct recovery rate was 95.3%; the enrichment ratio of gold and silve...

Embodiment 3

[0039] Finely grind the smelting slag until more than 50% is less than 0.1mm, using HCl concentration of 4.0mol / L, ZnCl 2 The concentration is 0.5mol / L, the liquid-solid ratio is 6:1, and the leaching temperature is 90°C for 1h; the leachate is 100g / L Zn(OH) at 20°C 2 Precipitate for 8 hours to obtain tin-antimony enrichment; after removing tin and antimony, replace bismuth with twice the theoretical amount of zinc powder to obtain crude bismuth; After conversion with a solid ratio of 3:1, the concentration of nitric acid is 1.5mol / L, the temperature is 40°C, the time is 1h, and the liquid-solid ratio is 4:1 for leaching, so that lead enters the solution, and rare and precious metals such as gold and silver are further enriched in the slag . After analysis, the enrichment ratio of tin and antimony reached 14 times, and the precipitation rate reached 99.9%; the leaching rate of bismuth was 99.8%, and the direct recovery rate was 95.0%; the enrichment ratio of gold and silver w...

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Abstract

The invention relates to a method for comprehensively recovering rare and dispersed noble metal from refining furnace slag, and belongs to the technical field of comprehensive recovery of rare and dispersed noble metal. Rare and dispersed metal is leached out through a hydrochloric acid-chlorine salt system, tin and antimony in leachate are removed through precipitation by precipitants including ferrous hydroxide, ferrous oxide, zinc hydroxide, zinc oxide and the like, and iron powder or zinc powder is used as a displacer used for precipitating bismuth in liquid obtained after tin and antimony precipitation, so that coarse bismuth is prepared; and lead in hydrochloric acid-chlorine salt leaching cinder is extracted through a conversion-leaching process, and noble metal such as gold and silver is enriched in slag which is returned for smelting. The tin-antimony enrichment ratio reaches 14% or over, and the precipitation rate is 99.9%; the bismuth leaching rate reaches 99.5% or over, and the direct recovery rate reaches 95% or over; and the gold-silver enrichment ratio is three or more times of the original ratio, and the recovery rate reaches 99%. The process and equipment are simple, energy consumption is low, the comprehensive resource recovery rate is high, the environment is protected, and organic connection with production of an existing factory is well achieved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of scattered and rare precious metals, and relates to a method for recovering smelting slag ash rich in scattered and rare precious metals such as bismuth, antimony, gold and silver produced in the smelting process of copper, lead, zinc, etc. . Background technique [0002] Scattered metals such as bismuth and antimony are scarce elements and are the supporting materials of cutting-edge technology industries. They are widely used. The global bismuth reserves available for recycling are about 330,000 tons, and the antimony reserves are 3.9 million tons. At present, bismuth is mainly extracted from bismuth concentrate after tungsten and molybdenum beneficiation, and some enterprises also recover from copper, lead, zinc and other smelting fumes. Copper-lead anode slime smelting slag is rich in a large amount of valuable scattered and rare metals such as bismuth, antimony, gold, silver...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCC22B7/007C22B7/04Y02P10/20
Inventor 蒋伟汪胜东蒋训雄范艳青冯林永张登高刘巍李达靳冉公赵峰
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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