Potassium borohydride-ammonium chloride reduction recovery method for platinum in laboratory waste precious metal materials

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

Active Publication Date: 2022-04-29
河南省岩石矿物测试中心
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  • Description
  • Claims
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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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  • Potassium borohydride-ammonium chloride reduction recovery method for platinum in laboratory waste precious metal materials
  • Potassium borohydride-ammonium chloride reduction recovery method for platinum in laboratory waste precious metal materials
  • Potassium borohydride-ammonium chloride reduction recovery method for platinum in laboratory waste precious metal materials

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Embodiment 1

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

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

[0021] Weigh 20.0 grams of experimental raw materials, put them 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 no bubbles appear in the solution, then continue to add about 50 ml in excess, and Control the total volume to about 200 milliliters, heat and dissolve to remove metals such as copper, lead, and aluminum that are soluble in nitric acid in the raw material, remove and cool, place for clarification, and pour off the supernatant. Add about 100 ml of aqua regia to the residue, place on a hot plate at 120°C to slightly boil to dissolve, and continuously add aqua regia until the platinum is fully dissolved. Continue to boil and heat the solution to a small volume, ad...

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Abstract

The invention discloses a potassium borohydride-ammonium chloride reduction recovery method for platinum in laboratory waste precious metal materials. Using laboratory platinum-containing waste consumables as raw materials, a potassium borohydride reduction-ammonium chloride precipitation method is established to recover platinum. Methods. Nitric acid is used to separate impurity elements, aqua regia dissolves platinum, and hydrochloric acid is used repeatedly to drive away nitrogen oxides, so that platinum is fully converted into chloroplatinic acid. At 40°C, 5% ( V / V ) in hydrochloric acid medium with potassium borohydride to reduce chloroplatinic acid to platinum black, then dissolve platinum black with aqua regia and completely convert it into chloroplatinic acid, and form yellow ammonium chloroplatinate precipitate with excess ammonium chloride, aging overnight. Select the step-by-step slow heating method to dry and decompose ammonium chloroplatinate, so as to obtain pure loose platinum powder or dense metallic platinum. The method is low in cost and easy to operate, and the residual platinum ions in the two precipitation solutions are all less than 20 ug / mL. The purity of 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 in particular relates to a potassium borohydride-ammonium chloride reduction recovery method for platinum in laboratory waste precious metal materials. Background technique [0002] Platinum crucibles, platinum yellow crucibles, platinum electrodes, platinum-rhodium thermocouples and other experimental equipment are commonly used in laboratories, as well as raw materials such as catalysts, electronic components, thermal instruments and chemical reagents containing platinum, all of which contain varying amounts. Platinum and other precious metals, especially platinum-based crucibles contain high platinum content. After using for a certain period of time, due to pollution, melting, deformation, denaturation and other reasons, the original function or part of the failure will be caused, and the use value will be lost. Long-term shelving or discarding causes great waste, therefor...

Claims

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Application Information

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Patent Type & Authority Patents(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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