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Manufacturing method of high-purity gold

A technology of pure gold and gold trichloride, applied in the field of inorganic compound preparation, can solve the problems of high impurity content, low purity of gold products, unable to meet the needs of the electronics industry, etc., and achieve the effect of low impurity content and high purity

Inactive Publication Date: 2013-02-13
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] High-purity gold is used in diffusion doping process and gold plating in the electronics industry, and is widely used. The previous preparation method is to dissolve 99.95% gold with aqua regia, and use sulfur dioxide or ferrous sulfate as a reducing agent to reduce gold trichloride. To gold, the obtained gold products have low purity and high impurity content, which cannot meet the needs of the electronics industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method of high-purity gold, the steps are as follows:

[0018] ⑴ Reduction to produce high-purity gold

[0019] Put 400g of 99.95% gold flakes in a 2000ml beaker, and add aqua regia (nitric acid: hydrochloric acid ratio 1:3) to heat and dissolve at a temperature of 150°C. During the heating process, add aqua regia continuously until the gold flakes are completely dissolved Finally, stop adding aqua regia, lower the temperature of the electric furnace to 220°C, continue to add hydrochloric acid into the gold trichloride solution beaker, and drive out nitrogen dioxide (NO 2 ), until white gas appears in the smog of gold trichloride solution evaporation, stop adding hydrochloric acid, (to drive away free nitric acid), continue to heat and concentrate the small volume to 200 milliliters, and cool the concentrated small volume gold trichloride solution to At room temperature, transfer it to a separatory funnel, add 200 ml of high-purity ether at a volume ratio...

Embodiment 2

[0023] A preparation method of high-purity gold, the steps are as follows:

[0024] ⑴Dissolve gold flakes, purify and extract

[0025] Put 500g of 99.95% gold flakes in a 2000ml beaker, and add aqua regia (nitric acid: hydrochloric acid ratio 1:3) to heat and dissolve at a temperature of 180°C. During the heating process, add aqua regia continuously until the gold flakes are completely dissolved Finally, stop adding aqua regia, lower the temperature of the electric furnace to 250°C, continue to add hydrochloric acid into the gold trichloride solution beaker, and drive out nitrogen dioxide (NO 2 ), until white gas appears in the smog of gold trichloride solution evaporation, stop adding hydrochloric acid, (to drive away free nitric acid), continue to heat and concentrate the small volume to 300 milliliters, the gold trichloride solution of concentrated small volume is cooled to At room temperature, transfer it into a separatory funnel, add 300 ml of high-purity ether at a volu...

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Abstract

The invention relates to a manufacturing method of high-purity gold. The manufacturing method includes the following steps: (1) gold sheets are dissolved, and concentration, purification and extraction are performed to obtain a gold chloride solution; and (2) high-purity gold is obtained through reduction, oxalic acid is added in the solution obtained in the step (1) under the condition of continuous stirring to perform reduction so as to obtain gold sediment, the gold sediment is washed by distilled water for 5-6 times, the distilled water is pumped, the gold sediment is arranged in a drying oven to be dried at the temperature of 80-100 DEG C, and the high-purity gold is obtained. The gold chloride solution is extracted by using high-purity diethyl ether so as to remove impurities to the optimum effect, and the high-purity oxalic acid is used as a reducing agent for restoring the gold chloride to obtain the high-purity gold. Due to the fact that a by-product of the oxalic acid using as the reducing agent is gas CO2, the step of impurity removal is omitted.

Description

technical field [0001] The invention belongs to the field of preparation methods of inorganic compounds, in particular to a preparation method of high-purity gold. Background technique [0002] High-purity gold is used in diffusion doping process and gold plating in the electronics industry, and is widely used. The previous preparation method is to dissolve 99.95% gold with aqua regia, and use sulfur dioxide or ferrous sulfate as a reducing agent to reduce gold trichloride. To gold, the obtained gold products have low purity and high impurity content, which cannot meet the needs of the electronics industry. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing high-purity gold with low impurity content, high purity, simple process steps and high production efficiency. [0004] The technical scheme that the present invention realizes purpose is as follows: [0005] A prep...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/10C22B3/26C22B11/00
CPCY02P10/20
Inventor 胡建华
Owner TIANJIN CHEM REAGENT RES INST
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