A method for collecting platinum group metals in spent catalysts by pickling sludge

A technology of spent catalysts and platinum group metals, applied in the direction of improving process efficiency, etc., can solve the problems of serious secondary pollution, large waste water output, heavy metal pollution, etc., and achieve the effect of reducing raw material costs, high recovery rate, and low energy consumption recovery

Active Publication Date: 2021-01-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because matte contains copper, lead, arsenic and other heavy metals, heavy metal pollution is serious
[0006] It can be seen that the existing process for recovering platinum group metals from spent catalysts has problems such as high material consumption and energy consumption, large waste water output, and serious secondary pollution. Therefore, it is urgent to develop green and efficient recovery of platinum group metals in spent catalysts. method

Method used

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  • A method for collecting platinum group metals in spent catalysts by pickling sludge

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Effect test

Embodiment 1

[0028] The pickling sludge was dehydrated at 120°C for 40 minutes, and then deoiled at 250°C for 60 minutes to obtain ferroalloy powder. 20wt% ferroalloy powder is mixed with 50wt% spent automobile catalyst scrap and 30wt% slagging agent to obtain a mixture, wherein the slagging agent consists of 25wt% CaO, 2wt% Na 2 CO 3 , 2wt% CaF 2 , 1wt% borax composition. The mixture was heated to 1450°C for 60 minutes, and the slag phase and iron phase were separated to obtain iron alloy rich in platinum group metals and waste slag. The capture rate of platinum group metals was 98.8%, and the grade of platinum group metals in the slag phase was 2.8g / t .

Embodiment 2

[0030] The pickling sludge was dehydrated at 119°C for 10 minutes, and then deoiled at 180°C for 120 minutes to obtain ferroalloy powder. 20wt% ferroalloy powder was mixed with 50wt% spent petroleum catalyst scrap and 30wt% slagging agent to obtain a mixture, wherein the slagging agent consisted of 30wt% CaO. The mixture was heated to 1300°C for smelting for 180 minutes, and the slag phase and iron phase were separated to obtain iron alloy rich in platinum group metals and waste slag. The capture rate of platinum group metals was 90%, and the grade of platinum group metals in the slag phase was 5g / t.

Embodiment 3

[0032]The pickling sludge was dehydrated at 118°C for 15 minutes, and then deoiled at 200°C for 115 minutes to obtain ferroalloy powder. 15wt% ferroalloy powder mixed with 65wt% expired chemical catalyst scraps and 20wt% slagging agent to obtain a mixture, wherein the slagging agent consists of 17wt% CaO and 3wt% Na 2 CO 3 composition. The mixture was heated to 1350°C for smelting for 170 minutes, and the slag phase and iron phase were separated to obtain iron alloy rich in platinum group metals and waste slag. The capture rate of platinum group metals was 90.8%, and the grade of platinum group metals in the slag phase was 4.8g / t .

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Abstract

The invention discloses a method for collecting platinum group metal in a spent catalyst by using acid pickling sludge, and belongs to the field of regenerated platinum group metal. After acid pickling sludge is pretreated and mixed with the spent catalyst and a slag forming agent, the mixture is melt and the platinum group metal in the spent catalyst is comprehensively recycled. According to themethod, the acid pickling sludge is used as a platinum group metal collector after being pretreated, the economic benefits are high, the environmental pollution is reduced, the harmless disposal and high-value utilization of secondary resources are achieved, and the platinum group metal in the spent catalyst can be efficiently recycled.

Description

technical field [0001] The invention belongs to the technical field of regeneration of platinum group, and in particular relates to a method for collecting platinum group metals in spent catalysts by pickling sludge. Background technique [0002] Platinum group metals have the characteristics of high melting point, high boiling point, low vapor pressure, good oxidation resistance and corrosion resistance, and high catalytic activity. They are widely used in catalysts and high-temperature corrosion alloys, etc., and their consumption is increasing year by year. However, due to the extremely low abundance of platinum group metals and the extremely uneven distribution of mineral resources, my country's platinum group metal resources account for only 2.14% of the world. Therefore, it is imperative to recover platinum group metals from secondary resources containing platinum group metals . [0003] Spent catalyst is an important secondary resource containing platinum group metals...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/02C22B1/00
CPCC22B1/005C22B7/001C22B11/026Y02P10/20
Inventor 张深根张俊杰刘波
Owner UNIV OF SCI & TECH BEIJING
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