Method and apparatus for recovering PGM and ferro-chrome from PGM bearing chromite ore

A chromite and alloy technology, applied in lighting and heating equipment, furnace types, furnaces, etc., can solve problems such as discarding chromium, and achieve the effect of energy saving and easy beneficiation

Inactive Publication Date: 2015-12-16
OUTOTEC FINDLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the method of US6699302B1 enables the use of raw materials with high chromium content, the chromium is ultimately discarded by the method
Also, the method is only designed for use with sulfide feedstocks

Method used

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  • Method and apparatus for recovering PGM and ferro-chrome from PGM bearing chromite ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The chromite containing PGM is finely ground to release the PGM particles. The already finely ground ore is beneficiated in a concentrator 10 where the goal is to remove the gangue while leaving iron, chromium, base metals and PGM in the concentrate. This method is simpler than beneficiation methods currently used in PGM recovery because there is no need to separate chromium and iron from the base metal and PGM.

[0031] The concentrate is thermally treated in the heating unit 12 , wherein it is dried (when required) and possibly preheated before being fed to the furnace 14 . The heating unit 12 can be, for example, a fluidized bed reactor, a rotary kiln or a drying tower. When the raw material contains large amounts of sulfides and / or volatiles, roasting can be performed in the heating unit 12 in order to oxidize the metal sulfides. The CO gas produced in the subsequent melting and slag furnaces 14 , 16 can be used as a heat source in the heating unit 12 .

[0032] ...

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Abstract

In a method for recovering PGMs and ferrochrome from platinum group metals bearing chromite ore, a concentrate is prepared that contains most of PGMs and chromite of the ore and the concentrate is subjected to a heating step to dry and/or preheat the concentrate, after which the preheated concentrate is smelted under reducing conditions in a DC smelting furnace (14) to produce molten metal alloy containing the PGMs of the feed and molten slag containing the chromium of the feed. The molten slag is tapped from the smelting furnace (14) into an AC slag furnace (16), where iron and chromium are reduced to produce a ferrochrome alloy. PGMs are recovered from the metal alloy tapped from the smelting furnace (14) utilizing hydro-metallurgical processes.

Description

technical field [0001] The present invention relates to a method and a device for recovering platinum group metals and iron-chromium alloys from PGM-containing chromite ore. Background technique [0002] Most of the world's known platinum reserves are located in South Africa, which produces most of the world's platinum. South Africa is also the world's largest single producer of ferrochrome. Platinum group metals or PGMs include platinum, rhodium, palladium, ruthenium, iridium, osmium. PGM often occurs with chromite. As a raw material, the platinum industry in South Africa is increasingly changing from the traditional Merensky vein to the UG2 vein. The UG2 vein contains the majority of the world's known PGM reserves and it also has a high chromite content. [0003] Current PGM recovery methods have several challenges when using UG2-based feedstocks. One difficulty is that ordinary furnaces cannot use concentrates containing more than 2.5% Cr. When the chromium content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/02C22B34/32
CPCC22B11/02C22B34/32F27B19/04C22C33/04C22C38/18B22F9/082Y02P10/20C22B1/00C22B5/02C22B7/04C22B9/00
Inventor L·内尔希
Owner OUTOTEC FINDLAND OY
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