The long homogenization treatment confirms that copper sulfide precipitation is meta stable phase caused micro-segregation by rapid solidification. 2) Technical Research Laboratories, POSCO, 1, Goedong-dong, Namgu, Pohang, Gyeongbuk, 790-300 Korea. Table 3 lists the solubility products for metal sulfides of the type MeS, Me2S, and Me2S3 [15].
Hydroxide Precipitation of Metals. Inthe absence of sulfur, dissolved copper was not pre-cipitatedbytheyeast. One copper smelter in Japan has a sulfide precipitation process to recover heavy metals as sulfides. identification of the black precipitate as copper sulfide included the demonstration with iodine-azidereagent ofH2Sformation bythe yeast from the interaction betweenglucose andsulfur. Iron was not precipitated by the H2S formed by any of the yeasts. The most common used method to remove soluble metal ions from solution is to precipitate the ion as a metal hydroxide. This process comprised oxidative pressure leaching at 155° C and conventional precipitation techniques for cobalt recovery. 2. The copper precipitation by use of iron, scrap or sponge.
lead sulfide and dimethyl sulfide. The carcinogenicity of cupric oxide, cupric sulfide, and cuprous sulfide in 2 to 3 month old Wistar rats /was studied/. Sulfide (British English also sulphide) is an inorganic anion of sulfur with the chemical formula S 2− or a compound containing one or more S 2− ions. A simple and rapid technique for removing copper from solution is to precipitate it with hydrogen sulfide. NASA/ADS. Metal sulfide precipitation occurs if the solubility product is smaller than the product of metal concentration times sulfide ion concentration: The findings have shown that the precipitation of copper … Textbook Solutions Expert Q&A Study Pack Learn. 1. Noranda devised a process for treating a concentrate containing 0.36 pct Cu. Initial precipitation tests were carried out in a 1,000-ml (0.26 gal) glass beaker using synthetic solution. Added as ferric iron, it was able to redissolve copper sulfide formed aerobically by Rhodotorula strain L from 18 but not 180 μg of copper per ml of medium.
Introduction. Cd, Cu, and Zn concentrations in the range of 0.05 to 0.1 mg/1 can be achieved with sulfide precipitation. Electrolytic deposition. Author information: (1)Department of Environmental Science and Engineering, Ewha Womans University, Seoul, Korea. Chegg home. The metal separations and settling rates obtained with conventional hydroxide precipitation (lime) are considerably lower than those obtained with sulfide precipitation. A full-scale sulfide precipitation process (Na2S as sulfide source) with a capacity of 1.0 x 106 gallons per day is operating at Boliden Metall Corporation of Sweden to treat smelter (Cu, Pb, Zn smelting) wastewaters. 1.