Preparation method of high-purity sponge palladium

• Main Authors: XING SHIYU, YI XINHUI, CAO YICHEN, SUN ZHE, WANG XUEHONG, LIU LI
• Format: Patent
• Language: Chinese; English
• Published: 24.03.2020
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a preparation method of high-purity sponge palladium. The preparation method comprises the following steps that a palladium-containing material with the palladium content of greater than or equal to 35% is used as a raw material, the raw material is dissolved by using aqua regia at normal temperature, and filtration is carried out; the filtrate is heated, HCL is added to the heated filtrate for denitration, and filtration is carried out; a precipitant and an oxidizing agent are added in the filtrate, a precipitate is generated after normal temperature reaction, and filtration is carried out; water is added to filter residues for pulping, ammonization is carried out until the pH value is 8-10, and filtration is carried out; hydrochloric acid is added to the filtratefor acidification until the pH value is 0.5-2, and filtration is carried out; water is added to filter residues for pulping, so that the palladium content is 30-120 g/L, ammonization is carried out until the pH value is 8-10,