Method for enriching noble metals from high-sulfur material

A technology for precious metals and materials, which is applied in the enrichment of low-grade precious metals and the enrichment of precious metals from high-sulfur materials. It can solve the problems of increasing the complexity of the enrichment process and achieve high recovery rate of precious metals, high enrichment ratio and easy investment. The effect of industrialization

Inactive Publication Date: 2014-05-14
云龙县铂翠贵金属科技有限公司
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Problems solved by technology

The reduction-grinding method is a common treatment technology that can process a wide variety of secondary resource materials with large differences in grade and properties, but the reduction process needs to be isolated from the air to prevent oxidation, which increases the complexity of the enrichment process
[0009] At present, there are many methods for enriching precious metals from high-sulfur materials, but there is no report tha

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  • Method for enriching noble metals from high-sulfur material

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Embodiment 1

[0027] Example 1, refer to the accompanying drawings, weigh 10kg of high-sulfur materials (containing Ni12.01%, Cu2.27%, S52.1%, Au60.87g / t, Ag120.11g / t, Pt101.23g / t, Pd92 .78g / t), add sodium carbonate as 20% by weight of high-sulfur material, lime as 10% by weight of high-sulfur material, mix and grind in a ball mill for 1 hour, after mixing, put it in a rotary kiln for oxidative roasting to fix sulfur, The roasting time is 3 hours, the roasting temperature is 700°C; after the roasting, hydrochloric acid is used for leaching, the concentration of hydrochloric acid is 25%, the volume is 50L, the leaching time is 4 hours, and the leaching temperature is 70°C; sodium salt and lime are added to the leaching solution, and the weight is 12kg. After filtering and washing, the precious metal enrichment is obtained, the precious metal enrichment ratio reaches 15.21 times, the precious metal content in the leach solution is less than 0.0004g / L, the precious metal yield is greater than 9...

Embodiment 2

[0028] Example 2, refer to the accompanying drawings, weigh 15kg of high-sulfur materials (containing Ni12.01%, Cu2.27%, S52.1%, Au60.87g / t, Ag120.11g / t, Pt101.23g / t, Pd92 .78g / t), add sodium hydroxide to the weight ratio of high-sulfur material 25%, calcium sulfate to the weight ratio of high-sulfur material 20%, mix and grind in a ball mill for 2 hours, after mixing, put it in a rotary kiln for oxidation roasting and solidification Sulfur, roasting time 6h, roasting temperature 800°C; leaching with hydrochloric acid after roasting, hydrochloric acid concentration 30%, leaching time 4h, leaching temperature 85°C, liquid-solid ratio 6:1; add sodium salt and lime to the leached liquid , the weight is 15kg, after filtering and washing, the precious metal enrichment is obtained, the precious metal enrichment multiple reaches 15.87 times, the precious metal content in the leach solution is <0.0005g / L, the precious metal yield is greater than 99.3%, and the precious metal is not dis...

Embodiment 3

[0029] Example 3, referring to the accompanying drawings, weighed 25kg of high-sulfur materials (containing Ni12.01%, Cu2.27%, S52.1%, Au60.87g / t, Ag120.11g / t, Pt101.23g / t, Pd92 .78g / t), add sodium sulfate to the weight ratio of high-sulfur material 24%, calcium hydroxide to the weight ratio of high-sulfur material 15%, mix and grind in the ball mill for 3 hours, after mixing, put it in the rotary kiln for oxidative roasting and solidification Sulfur, roasting time 5h, roasting temperature 750°C; leaching with hydrochloric acid after roasting, hydrochloric acid concentration 15%, leaching time 5h, leaching temperature 75°C, liquid-solid ratio 7:1; add sodium salt and lime to the leached liquid , the weight is 18kg, after filtering and washing, the precious metal enrichment is obtained, the precious metal enrichment multiple reaches 16.01 times, the precious metal content in the leach solution is <0.0005g / L, the precious metal yield is greater than 99.2%, and the precious metal ...

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Abstract

The invention discloses a method for enriching noble metals from a high-sulfur material. The noble metals are enriched through extracting base metals such as sulfur, nickel and copper from the high-sulfur material. Specifically the method comprises the following steps: fully grinding and uniformly mixing the high-sulfur material containing the noble metals, sodium salt, calcium salt, sodium hydroxide and lime in a ball mill; filling air in a rotary kiln to perform oxidation roasting on a mixture; adding hydrochloric acid into a roasted material to selectively leach out the base metals in the roasted material; adding the sodium salt and the lime into a leaching liquid, filtering and washing to obtain noble metal enrichment, wherein the enrichment factor is 14-20 times and the noble metals are not dispersed. The method has the advantages of simplicity, high enrichment factor, low cost, environment friendliness, high noble metal yield and the like, and has a better industrialization prospect.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy, and relates to a method for enriching low-grade precious metals, in particular to a method for enriching precious metals from high-sulfur materials. Background technique [0002] At present, there are many studies on the enrichment of precious metals from high-sulfur materials, mainly wet method and fire method. [0003] Wang Huoyin disclosed the experimental research on the wet enrichment of precious metals from lead matte in "Hydrometallurgy" Volume 33, Issue 1, 2014, and the full wet enrichment of copper removal by pressure acid leaching and carbonization conversion-nitric acid leaching of lead Precious metal process, process parameters: carbonization temperature 50°C, ammonium bicarbonate dosage 1.2 times the theoretical calculation, carbonization time 1.5h, liquid-solid ratio 4:1, nitric acid dosage 1.1 times the theoretical calculation. In the experimental range, the conversion rate o...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B11/00
Inventor 蹇祝明
Owner 云龙县铂翠贵金属科技有限公司
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