The silver flotation process of Xinhai includes three kinds of methods: flotation, flotation & gravity separation, flotation & cyaniding. While the flotation & cyaniding method is the most important process among the three. The silver concentrate can get in the process of flotation, then regrinding to the next process including cyaniding and leaching, countercurrent washing, zinc powder replacement, and silver ingot can finally get after the last process of electrolytic dissociation. Thus the process is characterized by high recovery and economic benefits.
The production line of flotation &cyaniding of Xinhai is mainly composed of the flotation machine, leaching agitation tank, zinc powder replacement equipment, washing thickener of 2 or 3 layers. The production line is characterized by high efficiency and capacity, low energy consumption, and reasonable economic costs.
To improve the recovery rate of the silver flotation process, the xinhai developed the mineral processing in three methods. Firstly, due to the thickness features of the silver particles to dissociate silver totally to improve the recovery rate. Secondly, use neutral or weak alkalinity pumps as well as sodium carbonate as regulators to improve the floatability of silver. Thirdly, sodium n-butyl xanthate and sodium butyl aerofloat are mix-used to enhance the collecting ability of the silver. Similar to other mineral processing methods, the silver flotation process also needs to prepare materials bef separation. That is to say, the ore should be grinded and classified to suit the flotation fineness. Xinhai also adopts the multi-layer thickener to dewater in three stages, and exchange the cyaniding process of one leaching and one dewatering into two of each, which highly improving the recovery rate of the silver. Xinhai also uses cyaniding to process Hydrogen-containing wastewater and to recover sodium cyanide, which proves to be a good method to solve wastewater pollution. The alloy gold can adopt electrolyte equipment to dissociate silver and get gold and silver ingot to improve economic efficiency.
Taking a silver mine in Inner Mongolia as an example, the beneficiation scale is 500t/d, and the actual production capacity is 750t/d. The main metal minerals in the ore are pyrite, chalcopyrite, silver-gold ore and natural ore. In view of the problems existing in the original production, Xinhai has carried out technical transformation of the silver ore beneficiation process based on the actual production. The silver beneficiation process adopts the combined process of flotation and cyanidation. Silver concentrate is obtained by flotation, and after regrinding, the concentrate is subjected to cyanidation leaching, countercurrent washing, and electrolytic separation to finally obtain silver ingots. The process is smooth and easy to operate. In addition, the number of beneficiation equipment for some silver ore and the system of flotation reagents are improved.
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