Platinum purification method and reaction kettle

Abstract

The invention relates to a platinum purification method and a reaction kettle. The problem that in an existing platinum purification technology, the recovery rate of platinum and the purity of spongyplatinum are not easily balanced is solved. The platinum purification method comprises the following steps that a platinum ingot and base metal are mixed together, molten to form liquid gold and processed to form gold grains; the gold grains and aqua regia are added to a dissolution reaction kettle, stirred and heated to enable the gold grains to be dissolved, and dissolved platinum liquid is obtained; the dissolved platinum liquid is added to a separation reaction kettle, ammonium chloride is added, and stirring operation and heating operation are conducted so that platinum ions in a solutioncan be deposited to form ammonium chloroplatinate; residual liquid in the separation reaction kettle is filtered away, the deposited ammonium chloroplatinate is washed and filtered by an ammonium chloride solution; and a reducing agent and the washed deposited ammonium chloroplatinate are added to the separation reaction kettle, ammonium chloroplatinate is reduced, and the pure spongy platinum isobtained, specifically, the weight ratio of the content of platinum in the platinum ingot to ammonium chloride is 1:(1-1.7). The platinum purification method has the advantages of saving the cost andbeing high in platinum primary recovery rate and high in purity of the spongy platinum.

Description

technical field [0001] The application relates to the field of platinum purification, in particular to a platinum purification method and a reaction kettle. Background technique [0002] Platinum (Pt) is a naturally occurring white precious metal with superior chemical stability. It can be used as jewelry decorations or handicrafts, as well as high-grade chemical vessels, platinum crucibles, electrodes or catalysts in chemical reactions. In addition, in the field of special materials, platinum can be used as an important raw material for the production of high-temperature thermocouples. Platinum purification is an important process in platinum processing, and the purity of platinum has a direct impact on the quality and service life of processed products. [0003] The classic method of platinum purification is "ammonium chloride repeated precipitation method". A certain amount of ammonium chloride is added to the solution (mixed solution of chloroplatinic acid and hydrochlo...

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Problems solved by technology

[0005] However, in the platinum separation and purification stage, if the recovery rate of platinum is to be increased and the platinum precipitation is complete, some impurity ions may be precipitated together, resulting in a lower purity of the sponge platinum after reduction. If the purity of the sponge platinum is to be improved, it is necessary to ensure The impurity content is very small, which will cause part of the platinum to not form precipitation, and the platinum needs to be recovered from the wastewater again, which increases additional production costs. The recovery rate of platinum and the purity of platinum sponge have always been a problem that is difficult to balance

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