Method for collecting platinum group metal through microwave heating fusion

A platinum group metal, microwave heating technology, applied in the field of precious metal recovery, can solve the problems of high platinum group metal content, high melting temperature, long melting time, etc., to achieve the effect of reducing melting time, low melting point, and reducing reaction activation energy

Active Publication Date: 2018-01-09
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the high smelting temperature, long smelting time, and the presence of platinum group metals in the slag in the recovery of platinum group metals in raw materials (such as spent catalysts) in the existing pyrotechnics and wet processes. The shortcomings of high conte

Method used

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  • Method for collecting platinum group metal through microwave heating fusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] See attached figure 1 , respectively weighed cordierite ceramic carrier automobile waste catalyst (wherein SiO 2 Around 31.6%, Al 2 o 3 About 39.1%%, about MgO4.6%, Pt 245g / t, Pd 1480g / t, Rh 185.2g / t) 200g, collector 200g (nickel matte, containing Ni 3 S 2 85.78%, NiO 5.89%, Cu 3.22%, Fe 2.5%), sodium carbonate 20g, borax 115g, and crushed until the particle size does not exceed 200 mesh, mixed with water and pressed into a 40mm×40mm×31mm agglomerate, dried and placed In the crucible, the crucible is placed in a microwave vertical melting furnace, the microwave heating frequency is 2450MHz, N2 is introduced as a protective atmosphere during the melting process, the microwave melting temperature is 1100°C, and the melting time is 2 hours. The content of platinum, palladium, and rhodium in the nickel matte obtained after smelting is 0.0486g, 0.2941g, and 0.0361g respectively, and the recovery rates of platinum, palladium, and rhodium calculated from this are 99.18%, ...

Embodiment 2

[0058] See attached figure 1 , respectively weighed cordierite ceramic carrier automobile waste catalyst (wherein SiO 2 Around 31.6%, Al 2 o 3 About 39.1%, MgO about 4.6%, Pt 245g / t, Pd 1480g / t, Rh 185.2g / t) 200g, collector 200g (nickel matte, containing Ni 3 S 2 85.78%, NiO 5.89%, Cu 3.22%, Fe 2.5%), sodium carbonate 0g, borax 115g, and crushed to a particle size of no more than 200 mesh, mixed with water and pressed into a 40mm×40mm×31mm agglomerate, dried and placed In the crucible, the crucible is placed in a microwave vertical melting furnace, the microwave heating frequency is 2450MHz, N2 is introduced as a protective atmosphere during the melting process, the microwave melting temperature is 1100°C, and the melting time is 1.5h. In the nickel matte, and separated from the slag, the contents of platinum, palladium and rhodium in the nickel matte obtained after smelting are 0.0443g, 0.253g, and 0.033g respectively, and the recovery rates of platinum group metals cal...

Embodiment 3

[0060] See attached figure 1 , respectively weighed cordierite ceramic carrier automobile waste catalyst (wherein SiO 2 Around 31.6%, Al 2 o 3 About 39.1%, MgO about 4.6%, Pt 245g / t, Pd 1480g / t, Rh 185.2g / t) 200g, collector 300g (nickel matte, containing Ni 3 S 2 85.78%, NiO 5.89%, Cu3.22%, Fe2.5%), sodium carbonate 10g, borax 80g, and crushed until the particle size does not exceed 200 mesh, mixed with water and pressed into a 40mm×40mm×31mm agglomerate, dried Then put it in the crucible, the crucible is placed in the microwave vertical melting furnace, the microwave heating frequency is 2450MHz, N2 is passed into the protective atmosphere during the melting process, the microwave melting temperature is 1050°C, the melting is 2h, and the platinum group metals are enriched after melting In the nickel matte, and separated from the slag, the contents of platinum, palladium and rhodium in the nickel matte obtained after smelting are 0.0466g, 0.2833g and 0.036g respectively, ...

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Abstract

The invention discloses a method for collecting platinum group metal through microwave heating fusion. The method comprises the following steps that firstly, the temperature of a mixture containing aplatinum group metal raw material, a collector and additives is raised to 1,050 DEG C-1,200 DEG C under microwaves, the mixture is fused, and after fusing is completed, slag-liquid separation is carried out, and a slag phase and metal matte are obtained; wherein the collector comprises Ni3S2, and the additives are at least one of borax, sodium carbonate, sodium bicarbonate, sodium hydroxide, sodium peroxide and methylcellulose; and secondly, the metal matte is cooled and subjected to acid leaching treatment, and pickle liquor and platinum-containing leaching slag are obtained. According to themethod, efficient recovering of the platinum group metal in a waste catalyst containing the platinum group metal can be achieved at the relatively low fusing temperature, the content of the platinumgroup metal in the slag can be reduced through slag flotation, the collector is recovered in lixivium, and resources are saved.

Description

technical field [0001] The invention relates to a method for collecting platinum group metals in waste catalysts by microwave heating and melting, and belongs to the technical field of precious metal recovery. Background technique [0002] my country's platinum group metal mineral resources are very poor, and the prospective reserves are less than 350 tons. my country's annual output of platinum group metal mineral resources from platinum group metal mineral resources is only about 3 tons. At present, my country is in a period of rapid economic development, and the consumption of platinum group metals is increasing year by year. It has become the largest consumer of platinum group metals in the world. The annual demand for platinum group metals in my country has reached more than 150 tons. Relying on mineral resources is far from meeting the needs of industrial development. The contradiction between supply and demand is very prominent. my country's automobile, petrochemical,...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B23/00
CPCY02P10/20
Inventor 彭志伟李光辉姜涛李志忠张元波饶明军林小龙颜加兴古佛全范晓慧郭宇峰杨永斌李骞徐斌杨凌志易凌云
Owner CENT SOUTH UNIV
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