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Method for recovering metal platinum from industrial waste

A technology for industrial waste and metal platinum, applied in the direction of improving process efficiency, can solve the problems of platinum volatilization loss, violent reaction, high reduction cost, and achieve the effect of improving platinum metal purity, high yield and purity, and low reduction cost

Inactive Publication Date: 2009-10-07
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As we all know, the existing methods for recovering metal platinum from industrial waste include: one is to enrich the platinum in industrial waste and purify it into (NH 4 ) 2 PtCl 6 Slurry with water, heat, stir, and add reducing agent hydrazine hydrate to reduce metal platinum. This method is common, mature, accurate and reliable. The disadvantage is that the reaction is violent during the reduction process, and a large amount of gas is released, which is prone to material liquid overflow and a small amount of platinum. The metal evaporates, the consumption of the reducing agent is large, and the hydrazine is easy to release harmful gas
The second is to enrich the platinum in industrial waste and purify it into (NH 4 ) 2 PtCl 6 After calcination, it is decomposed into metal platinum. This method requires special calcination vessels and equipment. During calcination, a large amount of acid gas and white smoke are discharged, polluting the environment, and platinum has a small amount of volatilization loss. The calcination decomposition time is long and the temperature is high, which is not conducive to precious metals. Platinum management, high cost of recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Will (NH 4 ) 2 PtCl 6 Add 200ml of wet basis into a reactor containing 1200ml of hydrochloric acid acidification aqueous solution, wherein the mass percentage of HCl and water in the HCl acidification aqueous solution is 1:80, heat to 45°C, stir at 1200 rpm, and feed reducing agent H 2 , H 2 The flow rate is 0.08m 3 / h, (NH 4 ) 2 PtCl 6 The reduced metal platinum settles at the bottom of the reactor, the platinum particles are uniform, and the precipitation is very good. After the reaction is completed, the solution is transparent and colorless. The resulting precipitate is filtered, washed until neutral, and drained. Dry at 120°C, pass the quality analysis and test, and put into storage.

Embodiment 2

[0013] Will (NH 4 ) 2 PtCl 6 Add 200ml of wet basis into a reactor containing 1500ml of hydrochloric acid acidification aqueous solution, the mass percentage of HCl and water in the HCl acidification aqueous solution is 1:100, heat to 50°C, stir at 900 rpm, and feed reducing agent H 2 , H 2 The flow rate is 0.1m 3 / h, (NH 4 ) 2 PtCl 6 The reduced metal platinum settles at the bottom of the reactor, the platinum particles are uniform, and the precipitation is very good. After the reaction is completed, the solution is transparent and colorless. The resulting precipitate is filtered, washed until neutral, and drained. Dry at 120°C, pass the quality analysis and test, and put into storage.

Embodiment 3

[0015] Will (NH 4 ) 2 PtCl 6 Add 200ml of wet basis into the reactor filled with 1800ml of hydrochloric acid acidification aqueous solution, the mass percentage of HCl and water in the HCl acidification aqueous solution is 1:120, heat to 65°C, stir at 1500 rpm, and feed reducing agent H 2 , H 2 The flow rate is 0.07m 3 / h, (NH 4 ) 2 PtCl 6 The reduced metal platinum settles at the bottom of the reactor, the platinum particles are uniform, and the precipitation is very good. After the reaction is completed, the solution is transparent and colorless. The resulting precipitate is filtered, washed until neutral, and drained. Dry at 120°C, pass the quality analysis and test, and put into storage.

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Abstract

The invention relates to a method for recovering metal platinum from industrial waste. The method comprises the following steps: metal platinum in industrial waste is purified by accumulation and placed in a reducing reactor with a stirrer in the (NH4)2PtCl6 form, then an HCl acidized solution is added, and after being heated to 30 to 70 DEG C and stirred, H2 is pumped for reducing, and (NH4)2PtCl6 is reduced into metal platinum which sinks onto the bottom of the reducing reactor, wherein the volume ratio of (NH4)2PtCl6 to the HCl acidized solution is 1:5 to 20. The method is simple, the reduction cost is low, the method is safe and reliable without pollution, and the yield rate and degree of purity of the metal platinum are high. The method is characterized in that hydrogen is taken as the reducing agent and (NH4)2PtCl6 after purification is reduced into metal platinum in liquid condition, and a small amount of base metal impurities included in solid (NH4)2PtCl6 is released in the solution, thus further increasing the purity of the metal platinum.

Description

technical field [0001] The invention relates to a method for reducing metal platinum, in particular to a method for recovering metal platinum from industrial waste. Background technique [0002] As we all know, the existing methods for recovering metal platinum from industrial waste include: one is to enrich the platinum in industrial waste and purify it into (NH 4 ) 2 PtCl 6 Slurry with water, heat, stir, and add reducing agent hydrazine hydrate to reduce metal platinum. This method is common, mature, accurate and reliable. The disadvantage is that the reaction is violent during the reduction process, and a large amount of gas is released, which is prone to material liquid overflow and a small amount of platinum. The metal evaporates, the consumption of the reducing agent is large, and the hydrazine is easy to release harmful gas. The second is to enrich the platinum in industrial waste and purify it into (NH 4 ) 2 PtCl 6 After calcination, it is decomposed into metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 沈丽新董庆张之翔曾永康
Owner XIAN CATALYST NEW MATERIALS CO LTD
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