The method of high chloride high salinity system for recovering gold from gold-bearing wastewater of low concentration

The present invention relates to a method in a high-salinity perchlorate system for recovering gold from gold-bearing wastewater of low concentration by sodium dithionite (of Na2S2O4) even containing compound, poor chemical stability, strong reduction of sulfur bond structure, the water medium easily hydrolyzed by action of dissolved oxygen or disproportionation reaction, like the principle of generating a series of corrosive products, to achieve an effective recovery of gold concentration less than 0.2mg / L of gold in gold-containing waste, significantly reduces the gold drain.