Lsss, Ml Preparation Of Gold Dissolution System Research

On the basis of the comparative study of leaching gold by those sulfur-bearingreagents, this paper mainly deals with the preparation of LSSS and ML(Modified Lime-Sulfur-synthetic-Solution) and their leaching gold systems. The experiment results showthe optimal ratio in synthesizing LSSS is Ca(OH)₂: S: H₂O=1: 3: 50, by which caneffectively use the raw materials. Solid LSSS was quickly synthetic by using of highlyeffective additives. When Solid LSSS was dissolved and properly oxidized, ML wasobtained, which is a kind of white soluble crystal. Through comparing different methodsof preparing ML,it can be seen that the initial concentration of LSSS influenced,etc theoxidation process .Volumetric analysis is the first choice of LSSS system for itsadvantages of easy operation, high accuracy and precision and which fully meets thedemands of practice. Na₂SO₃ acted as stabilizer of LSSS system, it can effectivelyprevent the oxidation of S₂O₃^2- and Sx^2-,when SO₃^2- reacted with S^2- and element S inthe LSSS leaching gold system,S₂O₃^2- or S_x-1^2- will be obtained, which is be beneficial togold leaching components.Also,S₂O₃^2- is helpful for dissolving of CuS and Cu₂S. In thestudy of reagent consumption,S₂O₃^2- was absorbed by about 8 percent, on the conditionof without air and SO₃^2-, the oxidation consumption of S₂O₃^2- by copper ammonia ion is32 percent, at the same time the oxidation of S^2- makes the quantity of S₂O₃^2- increaseby 20 percent, which compensated the oxidation consumption of S₂O₃^2-. In the conditionswithout air and SO₃^2-, the concentration of S₂O₃^2- in LSSS increased by 8 percent,while the reaction of SO₃^2- with Sx^2- consummated almost 67 percent of S₂O₃^2-. In thecondition of venting air and adding SO₃^2-, the consumption of SO₃^2- is about 40 percent,while the concentration of S₂O₃^2- increased by 76 percent, which compensated the loss ofS₂O₃^2- and make the gold leaching system more stable. The consumption of Sx^2- is causedby the decomposition of Sx^2- to S, S^2-, which then reacted with SO₃^2- and resulted inS₂O₃^2-. Appearance of blue crystal Na·[Ca(NH)₃(S₂O₃)₂]·4H₂O in LSSS system caused 8percent of Copper consumption. In ammonia media and the Cu₂S and CuS obtainedduring leaching process will be dissolvable. All these studies play an important role inwinns the tectwoaror isssanu Mibetwsolu.