Method for removing iron and enriching platinum group metals from smelted iron trapping material

A technology for platinum group metals and materials, which is applied in the field of iron removal and enrichment of platinum group metals in smelting iron capture materials, can solve the problems of high energy consumption, high cost and high temperature

Inactive Publication Date: 2013-07-03
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology helps recover valuable materials like gold or silver that were lost during production processes such as metal purification process. It involves reacting an alkaline mixture containing strong acids (sulfuric acid) on molten steel at high temperatures for several hours before it becomes solidified into pure fine particles called slag. By separating these tiny soluble components from other impurity elements found inside them, they can be recovered more efficiently compared to traditional methods involving burning away their original mineral deposits after dissolution.

Problems solved by technology

Technological Problem addressed in this patents relates to developing methods for effectively separating valuable metals like gold and silver from these alloys without causing excessive corrosion on devices during precipitation processes due to strong acids generated during decomposition. Existing techniques require expensive treatments involving heat melting and electrolysis, while others have issues associated with generating significant amounts of hazardous wastes and producing environmentally harmful effluences.

Method used

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  • Method for removing iron and enriching platinum group metals from smelted iron trapping material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1, referring to the figure, weigh 50g of finely ground pyrometallurgical iron capture material (-100mm), add it to a 2% ammonium chloride solution with a solid-liquid ratio of 1:3, press 5m 3 ·Min -1 ·M -3 Air was introduced into the slurry at a flow rate of 50°C and stirred for 4 hours at a temperature of 50°C. After the reaction was completed, the slurry was separated using a shaker to obtain platinum group metal concentrate and iron oxide. The iron removal rate reaches more than 80%, and the platinum group metal is enriched by about 4 times; the obtained iron oxide iron grade is greater than 65%, which can be returned to the trapping agent for the pyrometallurgical iron trapping process.

Embodiment 2

[0012] Example 2, referring to the attached drawings, weigh 50g of finely ground pyrometallurgical iron capture material (-100mm), add hydrochloric acid with a mass concentration of 2% and a concentration of 1.6% ammonium chloride according to a liquid-solid ratio of 1:4 In the mixed solution, press 10m 3 ·Min -1 ·M -3 Air was introduced into the slurry at a flow rate of, and the reaction was stirred at a temperature of 60°C for 6 hours. After the reaction, the slurry was separated using a shaker to obtain platinum group metal concentrates and iron oxides. The iron removal rate reaches more than 84%, and the platinum group metal is enriched by about 4.5 times; the obtained iron oxide iron grade is greater than 65%, which can be returned to the trapping agent used in the pyrometallurgical iron trapping process.

Embodiment 3

[0013] Example 3, referring to the attached drawings, weigh 50g of finely ground pyrometallurgical iron capture material (-100mm), and add it to 4% hydrochloric acid and 2% ammonium chloride at a liquid-solid ratio of 1:5 In the mixed solution, press 10m 3 ·Min -1 ·M -3 Inject industrial oxygen into the slurry at a flow rate of 70°C and stir the reaction for 6 hours. After the reaction, the slurry is separated by a shaker to obtain platinum group metal concentrate and iron oxides. The iron removal rate reaches 86 The concentration of platinum group metals is about 4.5 times; the iron grade of the obtained iron oxide is greater than 65%, which can be returned to the trapping agent used in the pyrometallurgical iron trapping process.

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Abstract

The invention discloses a method for removing iron and enriching platinum group metals from smelted iron trapping material. The method is characterized by comprising the following steps: the fine grinded smelting iron trapping material is added into the mixed solution medium which is composed of dilute acid and ammonium salt with a solid-to-liquid ratio ranging from 1:3 to 1:5; air is inflated into the medium with a flow rate of 5-10 m <3>*min<-1>*m<-3>; the mixed solution is stirred and reacted for 2 to 6 hours at the temperature of 40-70 degrees; iron in the material is subjected to corrosion reaction to form iron oxide; the iron oxide and platinum group metal are separated by using a gravity separation method after the reaction is finished; the iron is removed in the form of oxide and the removal ratio is above 85 percent; and the platinum group metal enriches by 4 to 5 times. The method can remove the iron and enrich the platinum group metal from the iron trapping platinum group metal material obtained by a fire smelting process, the process of the method is simple, free from contamination and low in cost, the waste liquor can be recycled, and the obtained iron oxide can be used as a trapping agent in the fire smelting process of platinum group metal.

Description

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Claims

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Application Information

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Owner KUNMING INST OF PRECIOUS METALS
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