Method for recovering precious metal platinum in car dead catalyst through pyrogenic process

A waste catalyst and precious metal technology, applied in the field of metallurgy, can solve the problems of increasing the extraction cycle, prolonging the extraction cycle, insufficient platinum capture, etc., and achieve the effect of reducing processing costs, reducing smelting costs, and easy industrialization

Inactive Publication Date: 2018-08-24
NORTHEASTERN UNIV +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] The main problem with the method of using Cu as the collector is: the process of reprocessing the Pt-Cu alloy in the later stage of smelting to obtain platinum metal. Generally, there are two methods to obtain platinum metal, oxidative blowing and electrolysis of anode copper, but these two methods It has the disadvantages of increasing the cost of extracting platinum metal, increasing the entire extraction cycle, and the subsequent waste residue and waste liquid are not easy to handle.
However, the use of Fe as the collector mainly has the following disadvantages: (1) most of the existing methods use metallic iron as the collector, and the density of metallic iron is relatively high, and most of the platinum in the spent catalyst is a platinum-containing compound. The compound needs to be reduced to metal platinum by a reducing agent to form an alloy with the collector. In the preparation process of the existing method, due to the high density of iron, when the platinum compound has not been transformed into me

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  • Method for recovering precious metal platinum in car dead catalyst through pyrogenic process

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Experimental program
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Effect test

Embodiment 1

[0031] See attached figure 1 , first carry out pretreatment to waste automobile catalyst, then weigh 10kg through pretreated automobile waste catalyst (wherein SiO 2 60%, Al 2 o 3 12%, Pt700g / t) and 4.31kg of dried slagging agent (including 3.1kg of CaO, Al 2 o 3 0.81kg, MgO 0.4kg) and Fe 3 o 4 0.35kg and 0.2kg of metallurgical coke (with a fixed carbon content of 80%) were mixed evenly, and made into blocks, and then put into a DC electric arc furnace after physical crushing, and smelted in a DC electric arc furnace at a high temperature of 1600°C for 2 hours. After the slagging process, the slag automatically floats on the upper layer of the melt due to its low density, and the platinum-containing alloy sinks to the bottom of the melt due to its high density, so that the entire melt is divided into two parts, the upper layer is slag liquid, and the lower layer For platinum-containing alloys. After the smelting is completed, the upper slag liquid in the graphite cr...

Embodiment 2

[0033] See attached figure 1 , first carry out drying treatment to waste automobile catalyst, drying temperature is 150 ℃, drying time is 14h, then weigh 5kg through drying treatment waste catalyst (wherein SiO 2 60%, Al 2 o 3 12%, Pt700g / t) and 2.22kg of dried slagging agent (including 1.61kg of CaO, Al 2 o 3 0.41kg, MgO 0.2kg) and Fe 3 o 4 0.18kg and 0.15kg of metallurgical coke (with a fixed carbon content of 80%) were mixed evenly, and made into blocks, and then put into a DC electric arc furnace after physical crushing, and smelted in a DC electric arc furnace at a high temperature of 2000°C for 2 hours. After the slagging process, the slag automatically floats on the upper layer of the melt due to its low density, and the platinum-containing alloy sinks to the bottom of the melt due to its high density, so that the entire melt is divided into two parts, the upper layer is slag liquid, and the lower layer For platinum-containing alloys. After the smelting is co...

Embodiment 3

[0035] See attached figure 1 , first carry out drying treatment to waste automobile catalyst, drying temperature is 150 ℃, drying time is 16h, then weigh 7kg through drying treatment waste catalyst (wherein SiO 2 60%, Al 2 o 3 12%, Pt700g / t) and 3.05kg of dried slagging agent (including 2.2kg of CaO, Al 2 o 3 0.57kg, MgO 0.28kg) and Fe 3 o 4 0.25kg and 0.18kg of metallurgical coke (with a fixed carbon content of 80%) were mixed evenly, and made into blocks, and then put into a DC electric arc furnace after physical crushing, and smelted in a DC electric arc furnace at a high temperature of 1800°C for 2 hours. After the slagging process, the slag automatically floats on the upper layer of the melt due to its low density, and the platinum-containing alloy sinks to the bottom of the melt due to its high density, so that the entire melt is divided into two parts, the upper layer is slag liquid, and the lower layer For platinum-containing alloys. After the smelting is co...

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Abstract

The invention discloses a method for recovering precious metal platinum in a car dead catalyst through a pyrogenic process. The method comprises the steps that (1) the car dead catalyst is pretreated,and then the car dead catalyst is sealed for standby application; (2) the car dead catalyst obtained in the step (1) is evenly mixed with a carbon reducing agent, a trapping agent and a slagging material according to a certain percentage to prepare blocky mixtures; (3) the mixtures obtained in the step (2) are broken to be placed into a direct current electric arc furnace for high-temperature smelting to obtain melted liquid; and (4) upper-layer slag liquid of the melted liquid obtained in the step (3) is poured out to prepare glassy state or wee glass balls, and a lower-layer precious metalplatinum containing alloy is naturally cooled at room temperature. The method is suitable for high-grade materials, can be used for recovering precious metal platinum from low-grade materials, the process is simple, and the period is short.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering precious metal platinum in waste automobile catalysts by means of pyrolysis. Background technique [0002] Due to its excellent physical and chemical properties, precious metal platinum is widely used in agriculture, petroleum industry, military industry, high-tech and other industries. Especially with the rapid development of science and technology in recent years, the demand for precious metal platinum in various industries is increasing day by day. At this stage, the main sources of precious metal platinum are mineral resources and secondary resources. However, the mineral resources of the precious metal platinum are extremely limited. In addition, the grade of platinum in the raw ore is low and most of them are paragenetic ores. As a result, it has become unsustainable to use mineral resources to extract precious metal platinum to meet ...

Claims

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Application Information

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IPC IPC(8): C22B11/02C22B7/00
CPCC22B7/001C22B11/028Y02P10/20
Inventor 孙树臣夏军刘川涂赣峰朱小平黄小晓卢帅丹李波索永喜于瑞赵来运李孝腾
Owner NORTHEASTERN UNIV
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