【Introduction】: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 whole, silver concentrate can be 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 be finally get after the last process of electrolytic dissociation. Thus the process characterized by high recovery and economic benefits.
【Application】: Silver flotation process mainly applied for the recovery of silver and associated metallic minerals, silver including two categories: one is silver &gold , the other is copper, lead and zinc associated.
The production line of flotation &cyaniding of Xinhai mainly composed of flotation machine, leaching agitation tank, zinc powder replacement equipment, washing thickener of 2 or 3 layers. The production line characterized by high efficiency and capacity, low energy consumption and reasonable economic costs.
To improve the recovery rate of the silver flotation process, 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 pump as well as the 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 to the silver. Similar to other mineral processing methods, silver flotation process also need 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 use cyaniding to process Hydrogen-containing wastewater and to recover sodium cyanide, which proves to be a good method to solve the wastewater pollute. The alloy gold can adopt electrolyte equipment to dissociate silver, and get gold and silver ingot to improve the economic efficiency.
A silvermine in Inner Mongolia, its beneficiation size can reach 500t/d, the actual production capacity is 750t/d. its main ore is Pyrite, chalcopyrite, gold, silver and other natural . Aimed at the existing problems and combined the production practice, Xinhai improved the technology of the process flow and adopted flotation &cyaniding process which is more convenient to operate.That is, silver concentration can be get from flotation and regrinding to enter the next stage of cyaniding and leaching, countercurrent washing, zinc powder replacement and silver ingot can be finally get after the last process of electrolytic dissociation. Otherwise, xinhai also adjusts the sets of the machines and improves the system of flotation reagents.