Papers by Author: Wan Zhong Yin

Abstract: In this paper, Mg (HCO₃)₂ solution, was obtained by the carbonate reaction of Mg (OH)₂ solution , using magnesite as raw materials. Mg ion concentration was measured by ICP-AES method. The effect of carbonization temperature, carbonization time, flux of CO₂ and agitation speed on the concentration of Mg ion in Mg (HCO₃)₂ solution was investigated. Results showed that Mg ion concentration reduced with increasing temperature, but increased a little as time went on and flux of CO₂ improved. With increasing the agitation speed, Mg ion concentration increased firstly, then decreased, finally remained unchanged. XRD analysis shows that the purity of obtained Mg (HCO₃)₂ solution is very high.

Abstract: In alkaline condition, experiments were taken to investigate the influence of different regulators on the flotation behaviors of brucite and serpentine when sodium oleate was the collector. The regulators used in experiments included sodium silicate, tannin and calcium lignosulphonate. The results showed that sodium silicate had a great effect on the flotation. When the regulator was the sodium silicate, serpentine recovery rate was less than 10% and brucite recovery was about 90% in the pH of 10. After analysis, brucite and serpentine may be separated effectively by sodium silicate. At last, the function mechanism of sodium silicate was probed. The electrostatic adhesion between serpentine and sodium silicate accured, and the surface of serpentine was negative so that it was difficult to be collected by sodium oleate; Instead, the impact of sodium silicate on brucite was weak, and the surface of brucite was still positive so that it could be collected easily.

Abstract: This paper summarizes the result of experiment that was fourced on investigation of oxidation pretreatment on sulfide mineral for leaching of refractory gold concentrate by hydrogen peroxide in sulfuric acid. For a viable option, extraction rate of Fe, Cu was low, but extraction rate of arsenic reached nearly 100%. As the result of oxidation, elemental sulfur was not produced.