Method for recovering platinum from laboratory waste noble metal material through potassium borohydride-ammonium chloride reduction

A technology of potassium borohydride and ammonium chloride, which is applied in the field of precious metal recovery, can solve problems such as difficult operation, high risk, and difficult storage, and achieve the effects of avoiding waste and loss, simple operation, and low cost

Active Publication Date: 2020-07-28
河南省岩石矿物测试中心
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is usually stored in liquid form, and it is easy to decompose in water to produce hydrogen gas, which is dangerous and difficult to store.
The reduction recovery rate of hydrazine and active metals is low, it is not easy to operate, and the recovery effect is not ideal

Method used

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  • Method for recovering platinum from laboratory waste noble metal material through potassium borohydride-ammonium chloride reduction
  • Method for recovering platinum from laboratory waste noble metal material through potassium borohydride-ammonium chloride reduction
  • Method for recovering platinum from laboratory waste noble metal material through potassium borohydride-ammonium chloride reduction

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Embodiment 1

[0019] The method of potassium borohydride-ammonium chloride reduction and recovery of platinum in waste precious metal materials in the laboratory of this embodiment is as follows:

[0020] (1) Dissolution of platinum in the sample

[0021] Weigh 20.0 g of experimental raw materials, put it into a 500 ml beaker, add 100 ml of distilled water, slowly add nitric acid with a volume ratio of 1:1, and keep stirring until there are no more bubbles in the solution, then continue to over-add about 50 ml, and The total volume is controlled to be about 200 milliliters. Heat to dissolve and remove metals such as copper, lead, and aluminum that are soluble in nitric acid from the raw materials. Take them off and cool them, place them for clarification, and discard the upper clear liquid. Add about 100 ml of aqua regia to the residue, place it on an electric heating plate at 120°C, and dissolve it in a slight boiling, and continue to add aqua regia until the platinum is fully dissolved. Conti...

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Abstract

The invention discloses a method for recovering platinum from a laboratory waste noble metal material through potassium borohydride-ammonium chloride reduction. The method for recovering the platinumthrough a potassium borohydride reduction-ammonium chloride precipitation method by taking a laboratory platinum-containing waste consumable as a raw material is researched and established. Nitric acid is adopted to separate impurity elements, the platinum is dissolved in aqua regia, nitric oxide is repeatedly expelled with hydrochloric acid, and the platinum is fully converted into chloroplatinicacid. The method comprises the following steps of reducing the chloroplatinic acid into platinum black by using potassium borohydride in a 40 DEG C and 5% (V/V) hydrochloric acid medium, then dissolving the platinum black by using the aqua regia, completely converting the platinum black into chloroplatinic acid, forming yellow ammonium chloroplatinate precipitate by using the chloroplatinic acidand excessive ammonium chloride, and performing aging and overnighting; and performing drying by using a segmented slow heating firing method, and decomposing the ammonium chloroplatinate to obtain pure loose platinum powder or dense metal platinum. The method is low in cost and easy and convenient to operate, and residual platinum ions in the two precipitation solutions are smaller than 20 ug/mL,the purity of the recovered platinum is not less than 99.5%, and the recovery rate is greater than 99%.

Description

Technical field [0001] The invention belongs to the technical field of precious metal recovery, and specifically relates to a method for reducing and recovering platinum from waste precious metal materials in laboratories with potassium borohydride-ammonium chloride. Background technique [0002] Labs commonly use platinum crucibles, platinum yellow crucibles, platinum electrodes, platinum-rhodium thermocouples and other experimental equipment, as well as various raw materials such as catalysts, electronic components, thermal instruments, and platinum-containing chemical reagents, all of which contain varying amounts. Such precious metals as platinum, especially platinum crucibles, have a higher platinum content. After a certain period of use, due to pollution, melting, deformation, denaturation, etc., the original functions or partial failures are caused, and the use value is lost. Long-term shelving or discarding causes great waste. Therefore, it is particularly necessary to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/007C22B11/04Y02P10/20
Inventor 王琳来佳仪程相恩张金矿陈冲科刘军胡家祯张明炜唐艺秋唐璟
Owner 河南省岩石矿物测试中心
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