Knowledge Management System Of Institute of process engineering,CAS
|Place of Conferral||北京|
|Keyword||氰化尾渣 氯化挥发 挥发率 吸收率|
Recently, fluosolids roasting processing has been used to oxidize refractory gold ore all over the world. However, cyaniding tailing of pretreated gold ore still contains considerable content of gold. Part of cyaniding tailing contains more than 5 g/t of gold. Other valuable elements are also contained in cyaniding tailing. The cyaniding tailing was pelletized, dried and roasted in rotary kiln. Exhaust gas flew through retention tower, turbulent ball tower, electrostatic mist precipitator, et al. Gold and silver were recovered in the filter residue from cyaniding tailing at last. The aims of high-efficiency recovery of gold and silver as well as comprehensive recovery of associated valuable elements were achieved. Main contents of the article are as follows.(1) Effects of bentonite dosage, water content , pelletizing time and other factors on the strength of pellets were studied.(2) Effects of various parameters of heating procedure such as temperatures of different parts of rotary kiln and holding time on the volatilization rate were analyzed.(3) Effects of HCl concentration and temperature of absorption liquid in retention tower and turbulent ball tower on the recovery of valuable metals from exhausted gas were studied to obtain full recovery of valuable metals and treatment of absorption liquid.Gold in the cyaniding tailing were mixed with chloride, roasted and absorbed from exhausted gas in the chloridizing-volatilization process. Cyanogen ion in the tailing was removed in the process. Volatilization rate of gold, silver, copper, lead and zinc are 95.6%, 82.5%, 73.1%, 93.9%, 75.2% separately. Roasted pellets could be sold as oxidized pellets to steel mill or building materials factory. Exhausted gas was treated by retention tower, turbulent ball tower, electrostatic mist precipitator and et al, and discharged up to standard. Chloride ion in the absorption liquid were recovered as chloride agent. The technology realizes the comprehensive use of gold resources and expands the source of gold concentrates, realize the cleaner production and comprehensive use in gold industry.
|刘洪晓. 金矿氰化尾渣氯化焙烧的技术研究[D]. 北京. 中国科学院研究生院,2016.|
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