Extraction method of platinum in high-concentration platinum solution

Abstract

The invention relates to an extraction method of platinum in a high-concentration platinum solution. The method comprises the following steps of 1) diluting a high-concentration platinum waste dissolving solution with a hydrochloric acid solution with the concentration being 4mol / L; and 2) preparing the platinum solution on which the first-grade extraction is performed by an extraction agent in a dilution manner by taking normal octane as a diluent and N-normal-butyl valnoctamide as a solute and discharging a raffinate so as to obtain an extract containing the platinum. By utilizing the method, the concentration of the platinum in the material solution can be improved to 20g / L; the first-grade extraction rate E is greater than or equal to 99.5%; the technological process is reduced; and the treatment time is shortened. Thus, the method is efficient.

Description

technical field [0001] The invention relates to the field of platinum metal extraction, in particular to a method for extracting platinum in a high-concentration platinum solution. Background technique [0002] Platinum group metal elements are very rare in the earth's crust, and each ton of solid matter in the earth's crust contains a few tenths of grams to a few tenths of a few grams, the least of which is rhodium, etc., and each ton contains about 1×10 -3 grams, platinum content per ton contains about 5×10 -3 gram. Platinum and rhodium belong to the platinum group metals. Because of their high melting point, good electrical conductivity, corrosion resistance and high temperature stability, high temperature strength and high temperature creep ability, they become important materials for modern industry and national defense construction. Widely used in aviation, aerospace, missiles, rockets, atomic energy, microelectric technology, chemical industry, glass industry, gas p...

AI Technical Summary

Problems solved by technology

[0006] At present, in the platinum extraction system prepared by industrial extraction agents, the concentration of platinum waste liquid is generally around 10g / L or even lower. The reason is that if the concentration of platinum waste liquid is increased, the concentration of extraction associates formed during the extraction process will be high. , leading to turbidity of the extraction system, difficulty in phase separation, and serious precipitation, resulting in the inability to extract and separate platinum, and the extraction system (such as 100% TBP, N235 + n-dodecane + octanol) prepared by the above-mentioned extractant is commonly used at present. It usually takes three to four repeated extractions to achieve a cumulative extraction rate of ≥99.5%. The extraction capacity of the extraction system (including factors such as extraction agent, diluent, acid-base type and its concentration) is small, and the extraction capacity at one time is weak. Platinum The overall extraction efficiency is low