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Recycling method of ammonium chloroplatinate reduction waste liquid

An ammonium chloroplatinate and waste liquid recycling technology, applied in the direction of improving process efficiency, can solve the problems of difficult recovery, high treatment cost, low precious metal recovery rate, etc., and achieve the effect of saving wastewater treatment cost and reducing cost.

Inactive Publication Date: 2021-07-02
深圳市金正龙科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This has the following problems: (1) the recovery rate of precious metals is low: because the waste water is weakly alkaline and contains a large amount of ammonium ions, the adsorption efficiency of ordinary resins to precious metals is very poor, which makes it difficult to fully recover; and (2) treatment costs High: The weakly alkaline solution cannot be directly discarded and discharged, it must be discharged after the wastewater treatment reaches the standard, or be handed over to a qualified environmental protection company for paid treatment

Method used

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  • Recycling method of ammonium chloroplatinate reduction waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]According to the ammonium chloroplatinate reduction waste liquid recycling method of the present application, the method comprises the following steps in sequence:

[0038] (1) Add 100g of crude platinum (purity 95.2%) into 400mL of aqua regia, dissolve at 80°C, then raise the temperature of the system to 110°C, add concentrated hydrochloric acid in batches under stirring until there is no reddish-brown gas in the system Escape, obtain chloroplatinic acid solution a, the chloroplatinic acid solution a is heated to boiling, add the ammonium chloride of 42g under agitation to precipitation completely, filter, filter cake is that the weight concentration is 10% ammonium chloride aqueous solution Wash to obtain 217.92g of ammonium chloroplatinate a, after which the ammonium chloroplatinate a is mixed with 110g of basic hydrazine hydrate solution (comprising 20wt% NaOH and 50wt% hydrazine hydrate), stirred and heated at 90°C Heat and reduce for 3.0 hours, filter to obtain 95....

Embodiment 2

[0044] According to the ammonium chloroplatinate reduction waste liquid recycling method of the present application, the method comprises the following steps in sequence:

[0045] (1) Add 100g of crude platinum (purity 98.1%) into 400mL of aqua regia, dissolve at 75°C, then raise the temperature of the system to 115°C, add concentrated hydrochloric acid in batches under stirring until there is no reddish-brown gas in the system Escape, obtain chloroplatinic acid solution a, the chloroplatinic acid solution a is heated to boiling, add the waste water c of embodiment 1 step (3) gained under stirring (adding ammonium chloride to its ammonium chloride total amount 41g) to precipitate completely, filter, and the filter cake is washed with the ammonium chloride aqueous solution of 7% with weight concentration, obtains the ammonium chloroplatinate a of 223.98g, then the basic hydrazine hydrate of described ammonium chloroplatinate a and 100g The solution (comprising 18wt% of NaOH and...

Embodiment 3

[0051] According to the ammonium chloroplatinate reduction waste liquid recycling method of the present application, the method comprises the following steps in sequence:

[0052] (1) Add 100g of crude platinum (purity 98.9%) into 390mL of aqua regia, dissolve at 80°C, then raise the temperature of the system to 115°C, add concentrated hydrochloric acid in batches under stirring until the system has no reddish-brown gas Escape, obtain chloroplatinic acid solution a, the chloroplatinic acid solution a is heated to boiling, add the waste water c of embodiment 2 step (3) gained under stirring (add ammonium chloride to its ammonium chloride total amount 42g) to precipitate completely, filter, and the filter cake is washed with the ammonium chloride aqueous solution of 5% with weight concentration, obtains the ammonium chloroplatinate a of 225.63g, then the basic hydrazine hydrate of described ammonium chloroplatinate a and 130g The solution (comprising 22wt% of NaOH and 45wt% of h...

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Abstract

The invention relates to the technical field of platinum metal purification, and particularly discloses a recycling method of ammonium chloroplatinate reduction waste liquid. The recycling method sequentially comprises the following steps that (1) crude platinum is dissolved with aqua regia to obtain a chloroplatinic acid solution a, precipitating is carried out with ammonium chloride or a solution containing ammonium chloride to obtain ammonium chloroplatinate a, and then reducing is carried out with an alkaline hydrazine hydrate solution to obtain sponge platinum a and wastewater a; (2) sponge platinum a is dissolved with aqua regia to obtain a chloroplatinic acid solution b, precipitating is carried out with wastewater a to obtain ammonium chloroplatinate b, and reducing is carried out with an alkaline hydrazine hydrate solution to obtain sponge platinum b and wastewater b; and (3) the sponge platinum b is dissolved with aqua regia to obtain a chloroplatinic acid solution c, ammonium chloride is used for precipitation to obtain ammonium chloroplatinate c, then an alkaline hydrazine hydrate solution is used for reduction to obtain purified sponge platinum and waste water c, wherein the waste water c can be used as the solution containing ammonium chloride in the step (1) of a next crude platinum purification process. According to the method, a large amount of ammonium chloride contained in the reduction waste liquid is fully utilized, and the wastewater treatment cost is saved.

Description

technical field [0001] The present application relates to the technical field of platinum metal purification, more specifically, it relates to a method for recycling ammonium chloroplatinate reduction waste liquid. Background technique [0002] Platinum (Pt), commonly known as platinum and platinum, is a precious metal chemical element, belonging to the platinum group elements, with an atomic weight of 195.078, a melting point of 1772°C, a boiling point of 3827±100°C, and a density of 21.45g / cm 3 (20°C), soft, with good ductility, thermal conductivity and electrical conductivity. Platinum has good chemical stability and is easy to process and shape. It can be used as jewelry decorations or handicrafts, as well as advanced chemical vessels, platinum crucibles, electrodes or catalysts in chemical reactions. In addition, it can also be used as a catalyst in special materials. An important raw material for the production of high temperature thermocouples. Platinum purification...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/00C22B3/44
CPCC22B11/042C22B7/006C22B3/44Y02P10/20
Inventor 江仲杨林
Owner 深圳市金正龙科技有限公司
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