High-purity gold powder clean production method

A production method and clean production technology, applied in the direction of metal processing equipment, process efficiency improvement, electrolysis process, etc., can solve the problems of inability to meet quality requirements, discharge waste water and waste gas, and high treatment costs, and save investment in environmental protection facilities and three waste treatment. The effect of cost, simple process and fast melting speed

Active Publication Date: 2020-07-24
厦门金玺燕贵金属科技有限公司
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Problems solved by technology

The patent with publication number CN104789794A proposes to prepare high-purity gold by secondary chlorination and secondary reduction. The whole process takes more than 30 hours, and SO2, HCl, and Cl will be emitted during the preparation process. 2 Waiting for waste gas, waste hydrochloric acid with a concentration of 12%-18% will also be discharged, the investment in environmental protection facilities is large, the cost of treatment is high, and it is impossible to realize clean production in the true sense
The patent with the publication number CN101985691A proposes a scheme for preparing high-purity gold by DBC extraction. The purity of high-purity gold prepared by this method can only reach 99.995%, which cannot meet the quality requirements of GB25933-2010, and this method also has the problem of discharging waste water and waste gas. question

Method used

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  • High-purity gold powder clean production method
  • High-purity gold powder clean production method
  • High-purity gold powder clean production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Milling: take 3N gold as raw material to produce 60 mesh gold powder with milling equipment.

[0046] (2) Dissolving gold: put 10kg60 mesh gold powder into a plastic reaction kettle, add 95L ion-exchanged water, 35kg potassium iodide, 23kg iodine and 3kg potassium iodate, stir and dissolve at 40°C for 30min, the gold is completely dissolved, and obtain a gold-containing solution, potassium iodide iodide and The purity of potassium iodate was analytically pure.

[0047] (3) Adjust the pH value of the gold-containing solution to 9.5 with high-grade pure potassium hydroxide, filter through a precision filter, retain the filter residue to recover silver and copper, and send the filtrate to a centrifugal extractor for extraction.

[0048] (4) Extraction: extract gold with 30% N235+70% sulfonated kerosene, compared to O / A=1:1, the order is 3, the gold extraction rate is ≥99.92%, platinum and palladium are almost not extracted, and the organic phase is separated and sent t...

Embodiment 2

[0060] Other conditions are the same as in Example 1, except that the ratio of low-purity gold powder, ion-exchanged water, potassium iodide, iodine and potassium iodate is changed to 10kg: 95L: 40kg: 25kg: 5kg, and the dissolution temperature is changed to 50°C in step 2. The dissolution time was changed to 35min.

[0061] The purity of the obtained high-purity gold powder was tested, and the results showed that the purity of the high-purity gold powder could reach the 5N level, meeting the requirements of GB / T25933-2010.

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Abstract

The invention relates to the technical field of high-purity gold preparing, and provides a high-purity gold powder clean production method. Iodine, potassium iodide and potassium iodate are utilized for assisting gold powder dissolving, gold enters a solution in the form of auric potassium iodide, silver, copper and other metal impurities in the gold containing solution are removed through pH value adjusting and filtering, iodine gold acid radicals are extracted into an organic phase through extraction, gold is deposited in a simple substance form through reverse extraction, and accordingly high-purity gold powder is obtained. According to the provided method, the gold dissolving speed is high, the process is simple, the purity of the obtained high-purity gold powder can reach the 5N level, and the GB25933-2010 quality requirement is met. Furthermore, raffinate and reverse extraction liquid can be used for recycling iodine through electrolysis. An extraction agent can be cyclically used after being regenerated, and therefore the provided method is free of waste water emission, energy saving and emission reducing are conducted to the maximum degree, and accordingly a large amount ofenvironment protection facility investment and three-waste treatment cost is saved.

Description

technical field [0001] The invention relates to the technical field of high-purity gold preparation, in particular to a clean production method of high-purity gold powder. Background technique [0002] High-purity gold is an important raw material for the electronics industry, and its usage is increasing year by year. my country took the lead in proposing the quality standard GB / T25933-2010 for high-purity gold products in 2010. In 2011, the analytical method standard GB / T25934-(1, 2, 3)-2011 was proposed. [0003] At present, foreign high-purity gold is mainly prepared by DBC extraction method and electrolysis method. The patent with the publication number CN101122032A proposes a method for preparing high-purity gold by electrolysis. This method has a long process, and there is a lot of gold accumulated in the process, and the electrolysis time is long, requiring electrolysis for 48 to 60 hours. The impurities in the electrolyte accumulate quickly and must be frequently pu...

Claims

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Application Information

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IPC IPC(8): B22F1/00C22B3/28C22B11/00C25B1/24
CPCC22B11/00C25B1/24C22B3/282B22F1/145Y02P10/20
Inventor 许良秋洪金铃梁昊天许仪方马晓红
Owner 厦门金玺燕贵金属科技有限公司
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