Extraction and enrichment of platinum group ore

Extraction and enrichment of platinum group ore: sand sand containing gold or platinum mines platinum group metal enriched by gravity separation available concentrate, platinum or osmium, iridium content can be 70% to 90%, can be directly refined .

The resources of gab mines are decreasing day by day, and due to the development of modern non-ferrous metal industry, platinum group metals have been mainly extracted from copper- nickel sulfide co-existing ore in the 1950s, and a small part has been extracted from copper-smelting by-products. In the case of pyrometallurgy, more than 90% of the platinum group metals contained in the concentrate can be enriched in copper-nickel ice-copper (锍). After being converted into high-ice nickel by converter, it is slowly cooled, ground, suspended and magnetically separated to obtain a copper-nickel alloy containing a platinum group metal. The alloy is vulcanized and smelted, and finely ground magnetically separated to separate copper and nickel to produce a copper-nickel alloy rich in platinum group metals. The alloy is cast into an anode, and when electrolysis is performed, the platinum group metal enters the anode slime. After the anode mud is acid treated, a platinum group metal concentrate can be obtained. When nickel is produced from a nickel concentrate or a copper-nickel alloy by a carbonyl method, the platinum group remains in the carbonylation residue, and a platinum group concentrate can be obtained by sulfuric acid treatment or pressure leaching (see leaching) of other metals. China Jinchuan Nonferrous Metals Co., Ltd. will re-vulcanize smelting and fine-graining and magnetically selecting a platinum-rich copper-nickel alloy, leaching nickel with hydrochloric acid, separating copper by controlled potential chlorination, and then extracting platinum group. metal.

High-nickel nickel with high platinum group content (such as raw materials in South Africa) is now directly leached with sulfuric acid under oxygen pressure, or metallurgical separation of other metals to obtain platinum group concentrate. The platinum group concentrate can be directly dissolved, separated, purified, or the ruthenium and osmium oxides are firstly oxidized and separated, and then the other platinum group metals are separated and purified.

In pyrometallurgical processes, and electrolytic refining of copper, the platinum group metal anode slime went into silver and gold. Dolsil silver (crude silver containing a small amount of gold) is refined from the anode mud, and the platinum group metal is concentrated in the Dol silver. The platinum group metal enters the crude lead during the pyrometallurgical lead- smelting process, and the lead-free silver can be removed by the ash blowing method, and the platinum group is enriched therein; if the crude lead plus zinc is desilvered, the platinum group metal is enriched in the silver-zinc shell, Then dezincification is more silver. In Dole silver electrolytic refining, in order to avoid palladium loss in electrolytic silver, the gold content of the silver anode is often controlled to be less than 4.5%, while controlling the gold-palladium ratio to be equal to or greater than 10. If part of the palladium and a small amount of platinum enter the silver nitrate electrolyte, it can be adsorbed by activated carbon or recovered by selective precipitation with "xanthine". Usually, in the case of electrolytic silver, the platinum group metal is concentrated in the silver anode mud. If the platinum group metal content is high, the anode mud can be dissolved first with aqua regia and then separately recovered; if the content is low, the sulfuric acid is dissolved in silver, the residue is cast into a gold electrode, and then gold is electrolyzed; platinum and palladium are concentrated in In the electrolysis mother liquor, gold is precipitated with oxalic acid, and then platinum and palladium are precipitated by sodium formate to be recovered; and other platinum group metals enriched in the gold anode slime can be further separated.

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