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Method for recycling platinum from waste platinum crucibles

A technology of platinum crucible and ammonium chloroplatinate, which is applied in the field of metal recovery and can solve problems such as difficulties in platinum recovery

Inactive Publication Date: 2012-06-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the platinum crucible used for the preparation of glass ceramic materials, due to the erosion of low melting point materials, makes the waste platinum crucible contain lead, niobium, silicon, sodium and other impurities, which brings difficulties to the recovery of platinum.

Method used

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  • Method for recycling platinum from waste platinum crucibles
  • Method for recycling platinum from waste platinum crucibles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The steps of the inventive method are:

[0025] (1) Put 105 g of spent platinum crucible in a 4000 mL beaker, add excess aqua regia (V hydrochloric acid: V nitric acid = 3:1) and place it on an electric furnace to heat and dissolve. After the platinum waste is completely dissolved, continue heating, concentrate the volume to 500mL, add hydrochloric acid to catch the nitrate until there is no yellow smoke. After diluting with deionized water, heat the dissolved salt.

[0026] (2) Dilute the platinum-containing solution obtained in (1) with water to 2000 mL, add 10 mL of concentrated sulfuric acid under stirring, continue stirring and let stand overnight. Filter with a Buchner funnel and rinse the funnel with deionized water. The filter residue is impurities such as insoluble matter and lead sulfate.

[0027] (3) Dilute the filtrate obtained in (2) with water to 2500 mL, heat to boil, add 950 mL of 25% ammonium chloride solution to precipitate platinum. Stand still, s...

Embodiment 2

[0031] The process of the inventive method is:

[0032] 105g waste platinum crucible is placed in 4000mL beaker, the 10mL vitriol oil in embodiment 1 is changed into 25g anhydrous sodium sulfate, all the other conditions are all the same, get sponge platinum 103.91g, productive rate 98.96%, sampling analysis, platinum content ≮99.99%.

Embodiment 3

[0034] The process of the inventive method is:

[0035] Put 105g of waste platinum crucible in a 4000mL beaker, change 10mL of concentrated sulfuric acid in Example 1 to 31g of potassium sulfate, and keep the rest of the conditions unchanged to obtain 72.15g of platinum sponge, with a yield of 68.71%. Sampling and analysis showed that the platinum content≮99.99 %.

[0036] Compared with the existing technology, for platinum recovery from waste platinum crucible containing impurities such as lead, niobium, silicon, sodium, etc., after being dissolved in aqua regia, concentrated sulfuric acid or water-soluble sulfate is used to pre-remove lead to reduce chlorination. The repeated times of ammonium platinum precipitation can not only shorten the refining cycle of platinum, reduce the amount of reagents, reduce the cost of purification, but also improve the purity of platinum sponge.

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Abstract

The invention relates to a method for recycling platinum from waste platinum crucibles. The method comprises 5 steps that: waste platinum crucibles are dissolved by using aqua regia; lead is removed by using a lead removing agent; platinum is precipitated by using ammonium chloride; platinum is refined; and platinum is calcined. According to the invention, waste platinum crucibles containing impurities such as lead, niobium, silicon and sodium are recycled as a platinum raw material; the raw material is dissolved by using aqua regia; concentrated sulfuric acid or water-soluble sulfate is added to the material, such that lead is pre-removed, and the frequency of repeated platinum precipitation by using ammonium chloride is reduced. Therefore, a platinum refining period is shortened, an agent dosage is reduced, a purification cost is reduced, and the purity of platinum sponge can be improved.

Description

technical field [0001] The invention relates to a method for recovering platinum from waste platinum crucibles, belonging to the technical field of metal recovery. The method recovers sponge platinum from waste platinum crucibles containing impurities such as lead, niobium, silicon and sodium. Background technique [0002] In the mid-1950s, the famous glass chemist and inventor S.D.Stookey first made glass-ceramics. In the 1970s, the research on glass-ceramics made further progress, and is currently praised by experts as a new type of ceramic material in the 21st century. Glass-ceramics is a composite material containing both crystal phase and glass phase obtained by controlling the crystallization of a matrix glass with an appropriate composition. It has the advantages of both glass and ceramics. It is often superior to metal and organic polymer materials. [0003] Due to their excellent compositional and microstructural tunability, glass-ceramics have greater potential fo...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/00
CPCY02P10/20
Inventor 王锦鹏滕乐金宋洪松
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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