Method for recovering noble metal platinum

Abstract

The invention provides a high-recovery-rate method for recovering noble metal platinum with low impurity element content and high purity, which comprises the following steps: 1) putting a noble metal platinum sample into a container, firing and cooling; 2) preparing a dissolution agent by using 36-38 wt% hydrochloric acid and 66-68 wt% nitric acid in a volume ratio of (1-4):1 a dissolution reagent; 3) adding the prepared dissolution reagent into the cooled container, and heating until the metal platinum is completely dissolved; 4) evaporating the solution by heating to the nearly dry state, adding hydrochloric acid, and evaporating the solution by heating to the nearly dry state; 5) dropwisely adding an ammonium chloride solution into the container, and filtering to obtain an ammonium chloroplatinate precipitate; and 6) putting the ammonium chloroplatinate precipitate into the container, firing and cooling. The metal platinum recovered from the noble metal platinum sample has the advantages of low impurity element content and high purity; and the method provided by the invention enhances the recovery rate of platinum, has the advantages of simple technical process, low cost and high recovery value, and is beneficial to energy saving, emission reduction and environmental protection.

Description

technical field [0001] The invention relates to a regeneration recovery technology, in particular to a regeneration recovery technology of precious metal platinum. Background technique [0002] The reserve of precious metal platinum on the earth is 0.002ppm, its content is rare, the output is limited, and the price is expensive; the remaining precious metal platinum sample after analysis and testing in the laboratory is high-purity sponge platinum and spectrally pure carbon powder in a ratio of 4:1 Mixed composition, if the precious metal platinum in the sample is effectively regenerated and recovered, high-purity platinum can be obtained with high recovery value. [0003] In the past, the laboratory usually adopted the method of regeneration and recovery of precious metal platinum: using aqua regia as a dissolving reagent, using the chemical characteristics that carbon powder is not easily dissolved by aqua regia, and platinum is soluble in aqua regia, after separating plat...

AI Technical Summary

Problems solved by technology

The disadvantages of using this method are: the recycling cycle of platinum is long, the consumption of dissolving reagents is large, the viscosity of the solution is high, platinum cannot be completely dissolved by aqua regia, and platinum and carbon powder will also produce overflow during the dissolution process. It is easy to overflow the container, which will increase the loss of precious metal platinum and reduce the regeneration recovery rate of platinum; in addition, other impurity elements will be brought in due to the splashing of liquid, which reduces the purity of platinum

Using this method to regenerate and recover platinum, the operation process is cumbersome and complicated, and the dissolving reagent aqua regia is used more, which is not conducive to environmental protection and the health of operators, the regeneration recovery rate is low, and the content of impurity elements in the recycled platinum is relatively high, and the purity is low. The recycling effect is not ideal

Therefore, this method is not conducive to the regeneration and recovery of rare and high-value precious metal platinum.