Preparation method of sponge platinum

A technology of sponge platinum and ammonium chloroplatinate, which is applied in the field of preparation of sponge platinum, can solve the problems of large reagent consumption, high energy consumption, and long dissolution process time, and achieve the effect of short process cycle and easy promotion

Inactive Publication Date: 2020-04-07
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the traditional platinum refining process, aqua regia is used as the solvent, which makes the dissolution pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] The embodiment of the present invention provides a method for preparing sponge platinum, which is specifically implemented according to the following steps:

[0027] Step 1. Slurry crude ammonium chloroplatinate with pure water in a volume ratio of 5-10:1, heat it to 80-90°C, add hydrochloric acid and sodium chlorate, and stir to obtain a mixed solution;

[0028] Wherein, the amount of hydrochloric acid added is 10%-20% of the solution volume after slurrying, the amount of sodium chlorate added is 5%-10% of the mass of crude ammonium chloroplatinate, and the stirring time is 1-2h;

[0029] Step 2. Boil the mixed solution of step 1 and keep it for 2-4 hours, then add ammonium chloride, and filter the mixed solution after cooling to obtain high-purity ammonium chloroplatinate; wherein the amount of ammonium chloride added is crude 50%-100% of the mass of ammonium chloroplatinate;

[0030] Step 3. Slurry the high-purity ammonium chloroplatinate, adjust the pH to 8-9 and heat to 60...

Example Embodiment

[0034] Example 1

[0035] Embodiment 1 of the present invention provides a method for preparing sponge platinum, which is specifically implemented according to the following steps:

[0036] Add 1kg of crude ammonium chloroplatinate to 10L of water for slurrying, add 1.2L of industrial hydrochloric acid and 70g of sodium chlorate to 85°C, keep the temperature and stir for 1h, boil the solution for 2h to remove chlorine, add 800g of ammonium chloride to the solution, After the solution is cooled, it is filtered to obtain high-purity ammonium chloroplatinate. The high-purity ammonium chloroplatinate is slurried by adding 7L of water, adding flake caustic so as to adjust the pH to 8, and heating to 65°C, adding an appropriate amount of hydrazine hydrate to obtain platinum;

[0037] Wash the platinum element with pure water and filter out the platinum black, then add hydrochloric acid, and then add hydrogen peroxide until the platinum black is completely dissolved. After dissolution, heat...

Example Embodiment

[0038] Example 2

[0039] Embodiment 2 of the present invention provides a method for preparing sponge platinum, which is specifically implemented according to the following steps:

[0040] Add 1kg of crude ammonium chloroplatinate to 8L of water for slurrying, add 1.5L of industrial hydrochloric acid and 60g of sodium chlorate to 88°C, and keep the temperature and stir for 1.5h. The solution was boiled for 3h to drive off chlorine. Add 900g of ammonium chloride to the solution. After the solution is cooled, it is filtered to obtain high-purity ammonium chloroplatinate. The high-purity ammonium chloroplatinate is slurried by adding 8L of water, and the pH value is adjusted to 8 by adding flake caustic soda. Proper amount of hydrazine hydrate to obtain platinum element;

[0041] Wash the platinum element with pure water and filter out the platinum black, then add hydrochloric acid, and then add hydrogen peroxide until the platinum black is completely dissolved. After dissolution, he...

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PUM

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Abstract

The invention discloses a preparation method of sponge platinum. The preparation method comprises the following specific steps that step 1, slurrying is carried out on crude chloroplatinate, heating is carried out, hydrochloric acid and sodium chlorate are added, and a mixed solution is obtained after stirring; step 2, the mixed solution is boiled and kept for the fixed time, ammonium chloride isadded, after the mixed solution is cooled, filtering is carried out, and high-purity ammonium chloroplatinate is obtained; and step 3, slurrying is carried out the high-purity ammonium chloroplatinate, the pH value is adjusted to 8-9, heating is carried out, hydrazine hydrate is added for reduction, and a platinum element is obtained; step 4, the platinum element in the step 3 is dissolved by using hydrogen peroxide, and a dissolved solution containing the platinum element is obtained; and step 5, precipitation is carried out on the dissolved solution in the step 4 by adopting an ammonium chloride step-by-step precipitation method, ammonium chloroplatinate is obtained, and then the ammonium chloroplatinate obtained through precipitation in the step 1 is calcined, and the sponge platinum isobtained. According to the method, impurity elements in the crude chloroplatinic acid ammonium are removed by adopting an aqueous solution chlorination method, and a hydrazine hydrate reduction-hydrochloric acid hydrogen peroxide dissolving-ammonium chloride step-by-step precipitation method is adopted to refine ammonium chloroplatinate to obtain the sponge platinum, and the whole process periodis short.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal smelting, and in particular relates to a method for preparing platinum sponge. Background technique [0002] The traditional platinum refining process usually uses a solvent (commonly known as aqua regia) prepared by one volume of nitric acid and three volumes of hydrochloric acid to dissolve impure crude ammonium chloroplatinate under heating and boiling conditions. [0003] In order to realize the complete dissolution of ammonium chloroplatinate, it is necessary to add aqua regia more than 5-6 times, and the aqua regia must be prepared on the spot. The nitrate in the solution must be evaporated completely until it is nearly dry, and then add dilute hydrochloric acid for more than three times as thick as syrup. Finally, add dilute hydrochloric acid to the solution without nitrate and heat to boil to obtain a platinum solution. After cooling , after filtration, ammonium chloride is added...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/44C22B3/22
CPCC22B3/22C22B3/44C22B11/04Y02P10/20
Inventor 许开华余顺文苏陶贵郑宏伟张云河易庆平
Owner JINGMEN GEM NEW MATERIAL
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