A method for recovering gold, palladium, platinum and silver from waste circuit boards

A technology for recycling used circuit boards and gold, applied in the field of recycling gold, platinum, silver, and palladium, can solve the problems that the recovery rate of recycled metals cannot reach a high level, the waste of resources does not meet the requirements, and the secondary pollution of the environment, etc. The effect of low cost, improving utilization rate and reducing pollution

Active Publication Date: 2011-12-14
荆门格林循环电子废弃物处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of metals in waste circuit boards. If they cannot be recycled effectively, it will cause secondary pollution to the environment. At the same time, the waste of resources does not meet the requirements of building a conservation-oriented society. Therefore, it is necessary to treat waste circuit boards recycling metals, eliminating electronic pollution, and realizing the comprehensive recycling of metal resources
At present, the recovery rate and purity of recovered metals for metal recycling of waste circuit boards still cannot reach a high level, and the recycling cost is relatively high

Method used

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  • A method for recovering gold, palladium, platinum and silver from waste circuit boards

Examples

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Effect test

Embodiment 1

[0021] figure 1 It is the process flow chart of the method for recovering rare and precious metals from waste circuit boards in this embodiment. The "precious metal-enriched powder" refers to the waste circuit board powder after copper, nickel, lead, tin and other metals are extracted.

[0022] (1) Low-temperature roasting. Take the powder after extracting copper, nickel, lead, tin and other metals. It also contains a small amount of other base metals and a small amount of non-metals. It needs to be roasted to remove a small amount of non-metals, volatilize a small amount of other impurities, and oxidize a small amount of base metals. For metals, the firing temperature is about 400°C, and the firing time is 3 hours.

[0023] (2) Sulfuric acid is soluble in acid. Take 10 kg of the above-mentioned roasted material and dissolve it with 6.5L of 150g / L sulfuric acid. The reaction temperature is 85°C and the reaction time is 3 hours. After the reaction, the content of copper, nickel, t...

Embodiment 2

[0027] (1) Low-temperature roasting. Take the powder after extracting copper, nickel, lead, tin and other metals. It also contains a small amount of other base metals and a small amount of non-metals. It needs to be roasted to remove a small amount of non-metals, volatilize a small amount of other impurities, and oxidize a small amount of base metals. For metals, the firing temperature is about 300°C and the firing time is 4 hours.

[0028] (2) Sulfuric acid is soluble in acid. Take 10 kg of the above roasted material, dissolve the roasted material with 100g / L sulfuric acid 9.75L, the reaction temperature is 95℃, the reaction time is 4 hours, the content of copper, nickel, tin, etc. in the remaining filter residue are all lower than 0.1%.

[0029] (3) Separation and recovery of palladium and silver. Use 13L of hot concentrated nitric acid (concentration of 70%) to dissolve palladium and silver. The reaction temperature is 70°C and the reaction time is 4 hours. The generated gas ...

Embodiment 3

[0032] (1) Low-temperature roasting. Take the powder after extracting copper, nickel, lead, tin and other metals. It also contains a small amount of other base metals and a small amount of non-metals. It needs to be roasted to remove a small amount of non-metals, volatilize a small amount of other impurities, and oxidize a small amount of base metals. For metals, the firing temperature is about 500°C, and the firing time is 2 hours.

[0033] (2) Sulfuric acid is soluble in acid. Take 10 kg of the above roasted material, dissolve the roasted material with 4.9L of 200g / L sulfuric acid, the reaction temperature is 95℃, the reaction time is 2 hours, and the content of copper, nickel, tin, etc. in the remaining filter residue is less than 0.1 %.

[0034] (3) Separation and recovery of palladium and silver. Use hot concentrated nitric acid (concentration 60%) to dissolve palladium and silver (the ratio of moles of nitric acid to moles of silver and palladium is 8:1), the reaction temp...

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Abstract

The invention relates to the field of industrial waste recycling and in particular relates to a method of reclaiming gold, palladium, platinum and silver from a waste circuit board. The method comprises the following steps: (1) removing impurities of a waste circuit board which is subjected to extraction of copper, nickel, lead and tin; (2) separating and reclaiming palladium and silver; and (3) separating and reclaiming platinum and gold. Compared with the prior art, the method provided by the invention has the advantages of lower reclaiming cost, higher recycling rate and higher purity of the reclaimed metals.

Description

Technical field [0001] The invention relates to the field of industrial waste regeneration, in particular to a method for recovering gold, palladium, platinum and silver from waste circuit boards. Background technique [0002] With the development of science and technology, the frequency of product updates has accelerated, and various electronic product wastes have increased. There are many kinds of metals in waste circuit boards. If they cannot be effectively recycled, they will cause secondary pollution to the environment. At the same time, the waste of resources does not meet the requirements of building a conservation-oriented society. Therefore, it is necessary to Recycling of metals to eliminate electronic pollution and achieve comprehensive recycling of metal resources. At present, for metal recycling of waste circuit boards, the recycling rate and the purity of the recycled metal still cannot reach a high level, and the recycling cost is relatively high. Summary of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20Y02W30/82
Inventor 王勤吴光源何显达梁小奎苏陶贵
Owner 荆门格林循环电子废弃物处置有限公司
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