Method and device for recovering precious metals from precious metal electronic scraps

一种电子废料、贵金属的技术，应用在塑料回收、机械材料回收、回收利用技术等方向，能够解决不利贵金属分离、成分复杂等问题

Active Publication Date: 2012-05-09
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More importantly, the use of this utility model is to mix waste materials and other microwave-absorbing substances together to absorb microwaves to directly heat ores and metals, which in itself makes the original simple waste materials more complicated, which is not conducive to the separation of precious metals

Method used

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  • Method and device for recovering precious metals from precious metal electronic scraps
  • Method and device for recovering precious metals from precious metal electronic scraps
  • Method and device for recovering precious metals from precious metal electronic scraps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment one (the process flow diagram A of the present embodiment is as figure 2 shown)

[0066] Raw materials: waste computer boards (1 ton)

[0067] plastic

copper

iron

lead

tin

nickel

Antimony

silver

gold

platinum

Palladium

content / kg)

272

130

41

29

20

18

10

9

0.45

0.05

0.02

Melting point / ℃

500

1083

/

327

231.9

1455

630.5

960

1063

1772

1552

[0068] process:

[0069] step 1)

[0070] After the discarded circuit boards are manually disassembled, harmful electrical components such as batteries, transformers, etc. Go to the secondary crusher to crush the material to less than 5mm.

[0071] step (2)

[0072] The above materials were put into electrostatic separation equipment for electrostatic separation, and 280 kg of metal-enriched bodies and 720 kg of pl...

Embodiment 2

[0087] Embodiment two (the process flow diagram B of this embodiment is as image 3 shown)

[0088] Raw material components and steps (1)~(6) are the same as embodiment one, difference is that the pyrolysis temperature T of this embodiment two 1 =600°C, melting temperature T 2 =900°C, melting temperature T 3 =1020°C, the vacuum pressure during all the vacuum filtration processes is 0.5 atmospheres, and the melting time is 10 minutes.

[0089] Step (7): using acid-soluble filtration method and electrolysis, extraction and other methods

[0090] Inject sulfuric acid (10%) into the feed port to submerge the filter residue, dissolve metal copper and its oxides, chlorides, etc. in the acid solution and filter through a filter screen. After 30 minutes, close the vacuum pump and the discharge port valve, open the lower pipeline valve, vacuum filter, and the base metal salt solution automatically flows into the vacuum chamber. Open the outlet valve and take out the base metal sal...

Embodiment 3

[0092] Embodiment three: (the process flow diagram C of the present embodiment is as Figure 4 shown)

[0093] Raw material components and steps (1)~(6) are the same as embodiment one, the difference is that the pyrolysis temperature T of this implementation three 1 =500°C, melting temperature T 2 =800°C, melting temperature T 3 =1000°C, the vacuum pressure in all vacuum filtration processes can be 0.2 to 0.5 atmospheres, and the melting time can be 5 to 30 minutes.

[0094] Step (7): using acid-soluble filtration method and microwave melting method

[0095] Sulfuric acid (10%) is injected into the material inlet to submerge the filter residue, and metal copper and its oxides, chlorides, etc. are all dissolved in the acid solution and filtered. After 30 minutes, close the vacuum pump and the discharge port valve, open the lower pipeline valve, vacuum filter, and the base metal salt solution automatically flows into the vacuum chamber. Open the outlet valve and take out th...

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Abstract

The invention provides a method for recovering precious metals from precious metal electronic scraps, which includes the following steps: precious metal electronic scraps are mechanically ground, electrostatically separated and magnetically separated in advance, residual rubber and plastic materials are removed by microwave pyrolysis, microwaves are utilized to indirectly heat precious metal electronic scrap powder, so that the precious metal electronic scrap powder is quickly melted, and thereby precious metals can be sequentially separated and recovered from the lowest melting point of precious metal to the highest melting point of precious metal. The method has the advantages of uniform heating, high speed, energy saving, high efficiency, no pollution and low production cost, and is easy to control. The method also can be used for separating and recovering other ordinary metals with highly different melting temperatures, and is not limited by whether heated materials absorb microwaves or not. The invention also provides a corresponding device, the structure design of the device is reasonable, and the device can help to increase the reaction speed and separate solid from melt in the process of melting precious metals, and is convenient to automatically operate. The invention can recover precious metals in precious metal electronic scraps, so that the resources in scraps can be utilized to the max, and therefore the invention can bring great social and economic benefits.

Description

technical field [0001] The invention relates to the treatment of industrial waste, in particular to a method and equipment for recovering precious metal from precious metal electronic waste. Background technique [0002] Precious metal waste refers to waste parts, waste slag and waste water containing gold, silver, platinum, palladium, rhodium, ruthenium, iridium and other precious metals. Its sources of raw materials are very extensive, mainly concentrated in mining, smelting, electronic appliances, electroplating, chemical and other industries. Due to the characteristics of rare, difficult to extract and high value of precious metals, recycling precious metals from precious metal scraps has huge economic and social benefits. [0003] Precious metal electronic scraps from electronic appliances mainly include: waste circuit boards (including printed circuit boards, integrated circuit boards), etc. Commonly used processing technologies include mechanical crushing, hydrometal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCF27D11/12C22B7/005B03B9/061C22B11/025F27D2099/0028C22B7/004Y02P10/20Y02W30/52Y02W30/62C22B7/00C22B11/00C22B59/00B09B3/00C22B4/04C22B4/08Y02W30/50
Inventor 许开华
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE
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