A method for removing silicon and phosphorus from iron-silicon-phosphorus alloys containing platinum group metals

A technology of platinum group metals and iron-phosphorus alloys, applied in the direction of improvement of process efficiency, etc., can solve the problems of low recovery rate of platinum group metals, difficulty in separation work, impact, etc., and achieve the effects of low pollution, simple process operation, and environmental friendliness

Active Publication Date: 2022-06-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively high reaction temperature of plasma furnace reduction smelting, generally higher than 1700 ° C, it is very likely that the silicon in the catalyst carrier will also be reduced into the iron-based alloy, and Ca may also be brought into the iron-captured iron alloy. , Mg, Al, P and other impurities; in the follow-up acid-dissolving work, because silicon impurities are insoluble in aqua regia, the obtained iron-based alloy containing platinum group metals will produce a large amount of insolubles, resulting in difficulties in separation work, platinum group metals In addition, the phosphorus impurities contained in the ferroalloy will generate a large number of bubbles in the acid dissolution process, which will affect the process of wet separation of precious metals and base metals.

Method used

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  • A method for removing silicon and phosphorus from iron-silicon-phosphorus alloys containing platinum group metals
  • A method for removing silicon and phosphorus from iron-silicon-phosphorus alloys containing platinum group metals
  • A method for removing silicon and phosphorus from iron-silicon-phosphorus alloys containing platinum group metals

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: The content of main elements in the iron-silicon-phosphorus alloy containing platinum group metals in this embodiment is shown in Table 1,

[0025] Table 1 Contents of main elements in iron-silicon-phosphorus alloys containing platinum group metals

[0026]

[0027] A method for removing silicon and phosphorus from an iron-silicon-phosphorus alloy containing platinum group metals, the specific steps are as follows:

[0028] (1) Combine slag-forming agent and iron oxide (Fe 2 O 3 ) are respectively dried and mixed to obtain a mixture; wherein the slag-forming agent is composed of CaO, SiO 2 and Al 2 O 3 Composition, based on the mass of the iron-silicon-phosphorus alloy containing platinum group metals as 100%, in the slag-forming agent CaO 35%, SiO 2 15%, Al 2 O 3 15%, iron oxide (Fe 2 O 3 )35%;

[0029] (2) The mixture and the iron-silicon-phosphorus alloy containing platinum group metals are subjected to slag refining, wherein the smelting ...

Embodiment 2

[0033] Example 2: The iron-silicon-phosphorus alloy containing platinum group metals in this example is the same as Example 1;

[0034] A method for removing silicon and phosphorus from an iron-silicon-phosphorus alloy containing platinum group metals, the specific steps are as follows:

[0035] (1) Combine slag-forming agent and iron oxide (Fe 2 O 3 ) are respectively dried and mixed to obtain a mixture; wherein the slag-forming agent is composed of CaO and Al 2 O 3 Composition, based on the mass of the iron-silicon-phosphorus alloy containing platinum group metals as 100%, in the slag-forming agent CaO 38.5%, Al 2 O 3 26.5%, iron oxide (Fe 2 O 3 )35%;

[0036] (2) The mixture and the iron-silicon-phosphorus alloy containing platinum group metals are subjected to slag refining, wherein the smelting temperature is 1843K, and the smelting time is 3h, and the slag gold is separated to obtain the iron-phosphorus alloy containing platinum group metals and silicon-containin...

Embodiment 3

[0040] Example 3: The iron-silicon-phosphorus alloy containing platinum group metals in this example is the same as Example 1;

[0041] A method for removing silicon and phosphorus from an iron-silicon-phosphorus alloy containing platinum group metals, the specific steps are as follows:

[0042] (1) Combine slag-forming agent and iron oxide (Fe 2 O 3 ) are respectively dried and mixed to obtain a mixture; wherein the slag-forming agent is composed of CaO and Al 2 O 3 The composition is based on the mass of the iron-silicon-phosphorus alloy containing platinum group metals as 100%, and in the slag-forming agent, CaO 40%, Al 2 O 3 10%, iron oxide (Fe2 O 3 )50%;

[0043] (2) The mixture and the iron-silicon-phosphorus alloy containing platinum group metals are subjected to slag refining, wherein the smelting temperature is 1843K, and the smelting time is 5h, and the slag gold is separated to obtain the iron-phosphorus alloy containing platinum group metals and silicon-conta...

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Abstract

The invention relates to a method for removing silicon and phosphorus from an iron-silicon-phosphorus alloy containing platinum group metals, and belongs to the technical field of comprehensive utilization of secondary resources. In the present invention, the slagging agent and the iron oxide are dried separately and mixed uniformly to obtain a mixture; the mixture is slag-forming and refined with the iron-silicon-phosphorus alloy containing platinum group metals, and the slag and gold are separated to obtain the iron-phosphorus alloy containing platinum group metals and silicon-containing waste slag ; At a temperature higher than the melting point of the iron-phosphorus alloy containing platinum group metals, the iron-phosphorus alloy containing platinum group metals is dephosphorized by vacuum refining to obtain the iron-phosphorus alloy containing platinum group metals. The present invention purifies the platinum-group metal-containing iron-silicon-phosphorus alloy obtained from the iron-capturing invalid catalyst through the method of combining slag-making refining and vacuum refining, and realizes the difficult-to-remove silicon and phosphorus in the platinum-group metal-containing iron-silicon-phosphorus alloy. The deep removal of impurities is beneficial to the subsequent separation of platinum group metals and base metal collector iron by pickling, and to obtain high-purity platinum group metals.

Description

technical field [0001] The invention relates to a method for removing silicon and phosphorus from an iron-silicon-phosphorus alloy containing platinum group metals, and belongs to the technical field of comprehensive utilization of secondary resources. Background technique [0002] With the increase of CO, HC, NO in automobile exhaust x The emission of harmful gases such as these has become increasingly strict, and automobile exhaust purification catalysts have become popular. The active ingredients that play a key role in auto catalysts are platinum, palladium, and rhodium—platinum group metals. The physical and chemical properties of platinum group metals are unique and superior, especially in the field of catalysis. Among them, platinum, palladium and rhodium are used in more than 60% of automobile exhaust gas purification catalysts every year. PGM ore is scarce and difficult to extract, so it is more economical and environmentally beneficial to recover PGM from spent a...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C33/04C21C7/10C21C7/064C22B7/00C22B11/02C22C38/00
CPCC22C33/04C22B7/001C22B11/026C21C7/10C21C7/064C22C38/002Y02P10/20
Inventor雷云杨清源杨东方马文会张陈康健李鹏
OwnerKUNMING UNIV OF SCI & TECH