Method for enriching precious metal by dissolving multi-metal alloy material through nitric acid

A multi-metal and precious metal technology, which is applied in the direction of improving process efficiency to achieve the effects of low production cost, simple process operation and easy industrialization

Active Publication Date: 2016-08-24
KUNMING BOREN PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In summary, the method of using nitric acid leaching—concentrating to remove nitric acid—dilution—filtering to separate the main metals

Method used

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  • Method for enriching precious metal by dissolving multi-metal alloy material through nitric acid

Examples

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Example Embodiment

[0024] Example 1

[0025] See attached figure 1 , Conditions: 1000 grams of polymetallic alloy materials, the amount of nitric acid added is 3 times the weight ratio of the raw materials, slowly heated to 85 ℃, stirring speed of 250 rpm, leaching time 5h, when the sampling and analysis of lead and copper leaching is complete, continue to heat and concentrate until sticky Thick, add water to dilute, the amount of water added is 4 times of the material weight ratio, after stirring evenly, filtering and washing, the leaching solution and leaching residue are obtained respectively. The leaching solution mainly contains lead and copper, and the leaching residue contains antimony, tin, gold, and silver. , Platinum, palladium and other metals; the leaching residue is leached by pressurized alkali, the amount of alkali is 40% of the weight of the slag, the temperature is 140℃, the time is 3h, the oxygen pressure is 1.0MPa, after the leaching is completed, it is filtered and washed to obt...

Example Embodiment

[0026] Example 2

[0027] See attached figure 1 , Conditions: 3000 grams of multi-metal alloy materials, the amount of nitric acid added is 4 times the weight ratio of the raw materials, slowly heated to 85 ℃, stirring speed of 250 rpm, leaching time 4h, when sampling and analysis of lead and copper leaching is complete, continue to heat and concentrate until sticky Thick, add water to dilute, the amount of water added is 3 times of the material weight ratio, after stirring evenly, filtering and washing, the leaching solution and leaching residue are obtained respectively. The leaching solution mainly contains lead and copper, and the leaching residue contains antimony, tin, gold, and silver. , Platinum, palladium and other metals; the leaching residue is leached with pressurized alkali, the alkali dosage is 20% of the weight of the slag, the temperature is 160℃, the time is 3h, and the oxygen pressure is 1.2MPa. After the leaching is completed, it is filtered and washed to obtai...

Example Embodiment

[0028] Example 3

[0029] See attached figure 1 , Conditions: 2000 grams of polymetallic alloy materials, the amount of nitric acid added is 2 times the weight ratio of the raw materials, slowly heated to 85°C, stirring speed of 250rpm, leaching time 2h, when the sampling and analysis of lead and copper leaching is complete, continue to heat and concentrate until sticky Thick, diluted by adding 4% low-concentration alkali, the added amount is 2 times the material weight ratio, after stirring, filtering and washing, the leaching liquid and the leaching residue are obtained respectively. The leaching solution mainly contains lead and copper, etc. The leaching residue contains antimony and tin , Gold, silver, platinum, palladium and other metals; the leaching residue is leached with pressurized alkali, the amount of alkali is 30% of the slag weight, the temperature is 150℃, the time is 5h, and the oxygen pressure is 1.3MPa. After the leaching is completed, filter and wash to obtain ...

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Abstract

The invention discloses a method for enriching precious metal by dissolving multi-metal alloy material through nitric acid. The method comprises the steps that the multi-metal alloy material is mixed with the nitric acid, placed in a titanium reaction kettle to be leached, heated to 85 DEG C-95 DEG C and kept for a period of time, when the multi-metal alloy material is concentrated to be in a sticky state, heating is stopped, water with the weight ratio being two to six times of that of the multi-metal alloy material is added at the same time so as to reduce the acidity, and the pH value of an end point is increased by one to three times or so, so that filtrating and separating are conveniently conducted between main metal lead, nickel, copper and the like and the precious metal; after filtering and washing are conducted, leaching liquid and leaching residue are obtained, the leaching liquid contains the lead, the copper and the like and serves as a raw material for recycling the lead and the copper, and the leaching residue contains bismuth, antimony, gold, silver, platinum, palladium and the like; and the antimony is removed through pressurizing and alkali leaching, alkali leaching liquid and alkali leaching residue are obtained after filtering and washing are conducted, and the precious metal enters the alkali leaching residue and effectively enriched. The method for enriching the precious metal by dissolving the multi-metal alloy material through the nitric acid is simple in process, easy to operate, mature in involved production equipment, easy to industrialize, environmentally friendly, low in production cost, high in precious metal enrichment ratio and good in industrialized application prospect.

Description

technical field [0001] The invention belongs to the field of metallurgy of rare and precious metals, and relates to a method for dissolving multi-metal alloy materials and collecting precious metals with nitric acid. Background technique [0002] Multi-metal alloy materials are precious metal secondary resources that are difficult to handle, mainly containing lead, copper, nickel, antimony, bismuth, tin, gold, silver, platinum, palladium, etc., and it is difficult to remove lead, copper, nickel by pyrooxidative blowing , antimony, bismuth, tin and other metals, precious metals will enter the smoke and dust, resulting in serious dispersion, the traditional wet treatment is difficult to remove metals other than precious metals in one step to enrich precious metals, and chlorination leaching will cause precious metals such as gold to disperse, which is not conducive to Precious metal enrichment and recovery. The current method of handling this material is as follows: [0003]...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 范兴祥余宇楠杨建中
Owner KUNMING BOREN PRECIOUS METALS
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