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Pretreatment method before enriching and recycling precious of metal in plasma smelting

A precious metal and pretreatment technology, applied in the direction of improving process efficiency, can solve the problems of long precious metal recovery cycle and long process flow, etc.

Active Publication Date: 2014-10-01
GUIYAN RESOURCE YIMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is too long and the recovery cycle of precious metals is long, so it has not yet achieved industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Taking the noble metal enrichment material obtained by plasma smelting as an example with a noble metal content of 4.72%, the unpretreated noble metal enrichment material and the pretreated noble metal enrichment material are dissolved and enriched with HCl at a concentration of 4 mol / L. The data analysis is as follows:

[0049] Material type Weight (g) HCl dosage (mL) Dissolving time (h) Filtration time (h) Weight after dissolution (g) Dissolution rate (%) Precious metal enrichment multiple Unpretreated precious metal enrichment material 200 800 2 40 185.26 7.37 1.08 Pretreated precious metal enrichment material 200 800 1 2 19.18 90.41 10.43

[0050] Take 200 grams of the noble metal enrichment material after plasma smelting, put it into a 300ml zirconia crucible, put the zirconia crucible into an 8000Hz high-frequency furnace, and raise the temperature to 1650°C to melt the material. Use a quartz glass tube to connec...

Embodiment 2

[0053] Taking the noble metal enrichment material obtained by plasma smelting as an example with a noble metal content of 4.72%, the concentration of 3 mol / L H 2 SO 4 The unpretreated precious metal enrichment material and the pretreated precious metal enrichment material were respectively dissolved and enriched, and the data analysis was as follows:

[0054] Material type Weight (g) h 2 SO 4 Dosage (mL) Dissolving time (h) Filtration time (h) Weight after dissolution (g) Dissolution rate (%) Precious metal enrichment multiple Unpretreated precious metal enrichment material 200 1000 2 40 182.04 8.98 1.10 Pretreated precious metal enrichment material 200 1000 1 2 18.22 90.89 10.98

[0055] Take 200 grams of the noble metal enrichment material after plasma smelting and put it into a 300ml zirconia crucible, put the zirconia crucible into a 10000Hz high-frequency furnace, and heat up to 1600°C to melt the material. Use a qua...

Embodiment 3

[0058] Taking the noble metal enrichment material obtained by plasma smelting as an example with a noble metal content of 4.72%, the current concentration of 2 mol / L HCl + 2 mol / L concentration H 2 SO 4 The unpretreated precious metal enrichment material and the pretreated precious metal enrichment material were respectively dissolved and enriched, and the data analysis was as follows:

[0059] Material type Weight (g) HCl+H 2 SO 4 Dosage (mL) Dissolving time (h) Filtration time (h) Weight after dissolution (g) Dissolution rate (%) Precious metal enrichment multiple Unpretreated precious metal enrichment material 200 1000 2 40 179.46 10.27 1.11 Pretreated precious metal enrichment material 200 1000 1 2 17.98 91.01 11.12

[0060] Take 200 grams of the noble metal enrichment material after plasma smelting and put it into a 300ml zirconia crucible, put the zirconia crucible into a 9000Hz high-frequency furnace, and raise the ...

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PUM

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Abstract

The invention discloses a pretreatment method before enriching and recycling precious of metal in plasma smelting. A precious metal enriched material obtained from invalid automobile catalysts after being treated by using a plasma smelting technique is pretreated before the precious metal is recycled according to the following steps: (1) putting a pretreatment object into a zirconium oxide crucible, further putting the zirconium oxide crucible into a high-frequency furnace of 8000-10000KHz, and heating to be 1600-1800 DEG C so as to melt the material; (2) connecting a quartz glass tube with oxygen, wherein the mouth of the tube is 15-25mm away from a liquid level formed by the molten material, the flow of oxygen is 150-200L / hour, and blowing oxygen for 60-120 minutes; and (3) casting the material obtained in the step (2), cooling for 30-60 minutes till the material is divided into two upper and lower layers, and removing an upper slag layer to obtain a lower metal phase layer. The material obtained from pretreatment can be easily dissolved in acid, no viscous substance is generated in the dissolving process, the solid-liquid separation can be conveniently performed, and the precious metal can be conveniently recycled.

Description

technical field [0001] The invention relates to the field of secondary resource recovery of waste precious metals, in particular to the treatment of cordierite (2MgO·2Al 2 o 3 ·5SiO2 2 ) is a pretreatment method before recovering precious metals from precious metal-containing ferroalloys obtained after enrichment of carrier honeycomb-like spent autocatalysts. Background technique [0002] Due to the unique purification ability of platinum, palladium and rhodium in precious metals on automobile exhaust, more than 60% of platinum, palladium and rhodium are used in the production of automobile catalysts every year. In 2011, the global consumption of platinum in auto catalysts reached 96.6 tons, 187.6 tons of palladium, and 22.1 tons of rhodium, and 38.1 tons of platinum, 51.5 tons of palladium, and 8.7 tons of rhodium were recovered from spent auto catalysts. Although many institutions are researching new catalysts to replace or reduce the use of precious metals, the demand ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B7/00C22B11/00
CPCY02P10/20
Inventor 贺小塘赵雨王欢吴喜龙李勇韩守礼郭俊梅谭文进李锟肖雄刘伟李子璇陈晓
Owner GUIYAN RESOURCE YIMEN
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