Method for recovering gold from gold-containing ash and silicon carbide abrasives

Gray cast raw materials from gold gold pen nib grinding plant generated; gold plant offal scrap; jewelry factory because the polishing dust, and other open-chain process produces hammering; textile machinery such as abrasive nylon spinneret. Such waste can be recovered by fire smelting or by wet separation.
      1. Fire smelting After collecting the gold-containing dust and screening the impurities, the following ingredients are used: 100 grams of dust, 1.5 grams of lead oxide, 30 grams of sodium carbonate, 20 grams of saltpetre, and mix it evenly into the crucible. , and then a thin cap layer borax, into the melting furnace to give Jingui containing lead, gold can be obtained after the crude lead cupellation expensive. If the crude gold has platinum or rhodium , it can be further separated from platinum and rhodium by melting with aqua regia.
      2. Wet separation The gold ash in the gold pen factory often contains precious metals such as gold, bismuth and platinum. The ruthenium is insoluble in aqua regia, and the ruthenium is first separated, then the platinum is separated from the aqueous solution of the king, and finally the gold is recovered.
      3. Recycling of gold in scrap diamond grinding Generally, the method of recovering gold is carried out by using hydrochloric acid soaking, aqua regia dissolution and reduction precipitation.

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