Systematic Study On Adsorption Performance Of Activated Carbon In Whole Mud Cyanidation And Heap Leaching

Our country has introduced the method of CIP process in the 1980s.The process has been solved the gold bearing oxidized gold ore extraction technical problems, and make our country gold technology with the advanced world level, Also makes our country’s gold reserves continue to increase at a high speed. However, this technology still has some problem need to be solved in the process. Therefore, this experiment conducted studies of coconut shell activated carbon adsorption performance.In this dissertation, we mainly focus on the research and realization the activated carbon in two methods of cyanide leaching gold. By national standard LY/T 1125—93. We determined the basic physicochemical properties of new coconut shell activated carbon. Including wear resistance strength, specific surface area, iodine value, loss on drying, Filling specific, apparent density, particle size, ash content and screen underflow. We also study the new polishing pretreatment method of active carbon. Compared the dry polishing, add SiC wet polishing and several diameter ratios dry polishing. Get the conclusion that dry polishing solution showed coarse particle breakage; add SiC wet polishing will reduce in the actual production of activated carbon adsorption quantity of gold and silver; several diameter ratios wet polishing has a better result on various aspects of the aspect, and also had no effect on the activity of activated carbon adsorption. Study found that Rushton impeller had better polishing effect than other ways. When diameter ratio is 2:1, polished activated carbon had least wear (0.74%) in the simulation of pulp. We also determined adsorption capacity and adsorption rate of new activated carbon and gold-loaded carbon. In the CIP leaching adsorption process, each tank of activated carbon adsorption rate, adsorption capacity and wear resistance has been studied. We found the adsorption rate and adsorption capacity gradually decreases in accordance with string order of first tank to last tank. The adsorption rate of activated carbon in last tank is 20.50%, adsorption capacity is 2208g/t. This means the activity of carbon recovery effect after desorption is poor. We research the condition of thermal regeneration method of activated carbon and optimized it. Water vapor is the most appropriate regeneration gas, control the steam consumption for 100g activated carbon is 3.5g/min, control the temperature about 650 degrees centigrade, regeneration time about 20 minutes.Thermal regeneration technique index:the abrasion strength is 95.56%; the iodine value is 1243 mg/g; the adsorption rate is 45.2%.