Joint preparation method of potassium chloroplatinite and potassium chloroplatinate

Abstract

The invention relates to a joint preparation method of potassium chloroplatinite and potassium chloroplatinate. The joint preparation method comprises the steps of: completely dissolving metal platinum which is taken as a raw material by aqua regia, and adding hydrochloric acid to remove nitrogen compound to obtain chloroplatinic acid solution; neutralizing the chloroplatinic acid solution by using potassium hydroxide solution until the pH value is 5.5-7.5; adding potassium oxalate for reducing to obtain the potassium chloroplatinite; and separating out crystal, and adding hydrogen peroxide into the rest mother liquor to obtain the potassium chloroplatinate. The joint preparation method can be used for preparing two products by charging for once, is simple in technology and short in process flow, does not generate platinum-containing mother liquor, and is high in platinum utilization rate and good in product quality. The potassium chloroplatinite and the potassium chloroplatinate prepared by the invention are mainly used for manufacturing catalysts, chemically analyzing, preparing platinum-containing complexes and platinum-containing metallorganic compounds and the like, and are widely applied to industries such as military industry, electronic industry, medical industry, etc.

Description

technical field [0001] The invention belongs to the field of production of fine chemical products, in particular to a combined preparation method of potassium chloroplatinite and potassium chloroplatinate. Background technique [0002] Potassium chloroplatinite (K 2 PtCl 4 ) is potassium chloroplatinate (K 2 PtCl 6 ) as the starting material, which is prepared by reducing tetravalent platinum to divalent platinum with hydrazine hydrochloride or sulfur dioxide as the reducing agent. The process is complicated to operate and requires strict requirements. The amount of reducing agent is controlled, and platinum black will be generated if the reducing agent is slightly excessive. Potassium chloroplatinite (K 2 PtCl 4 ) has a small solubility, and the mother liquor after crystallization contains a large amount of platinum, which is generally reduced to metal platinum for recycling. [0003] Potassium chloroplatinate (K 2 PtCl 6 ) is chloroplatinic acid (H 2 PtCl 6 ·6H ...

AI Technical Summary

Problems solved by technology

The process is complicated to operate and requires strict requirements. The amount of reducing agent is controlled, and platinum black will be generated if the reducing agent is slightly excessive.