Because niobium minerals are easily soluble in alkaline cyanide solutions, niobium minerals can seriously affect the cyanide leaching of gold . There are several common methods for separating gold and antimony minerals: Car Parts,Plastic Injection Molding Parts,Custom Injection Plastic Parts,Injection Molding Parts Boat Lever Ningbo Zongchi Machinery Technology Co., LTD , https://www.nbdiecastservice.com
1.8 to 10% sodium sulfide solution is a good solvent for stibnite and some cerium oxide minerals. Usually, at 80 to 90 ° C, when the slurry concentration is not less than 33%, the gold and strontium in the ore can be separated by leaching with the above solution for 1 to 2 hours. After the residue was washed with water, gold was recovered by cyanidation.
2. The gold-bismuth concentrate can be calcined by evaporating the antimony trioxide. Usually, the calcination is carried out in two stages, the first stage is calcined at 500 to 600 ° C for 1 hour, and the second stage is calcined at 1000 ° C for 2 to 3 hours. The antimony trioxide is recovered by a dust collector, and after the calcination is leached with dilute sulfuric acid, the gold is recovered by cyanidation.
3. The hot leaching in the medium of oxygen and ammonia solution can recover gold from the gold-bismuth concentrate. When the concentration of ammonia hydroxide in the solution is 33 to 35%, the temperature is 170 to 175 ° C, and the oxygen pressure is 15 to 16 atm, the leaching time is 24 to 30 hours, and 99% of gold can be recovered in the gold-rich concentrate.
4. Gold is leached from the gold-rhenium concentrate using an acidic thiourea [CS(NH 2 ) 2 ] solution with an oxidizing agent. When the concentration of thiourea in the solution is 0.1 to 1%, the concentration of sulfuric acid is 0.1 to 0.5%, and the concentration of oxidizing agent is 0.001 to 0.1%, the leaching rate of gold can reach 60 to 70%.