Gold concentrate cyanide gold extraction process classification
On the status and the type of rock gold mining deposits in the domestic mine production using this technology point of view, flotation - concentrate typical of cyanidation process is mainly used for simple gold minerals gold-bearing quartz vein type gold-bearing sulfide ores and erosion Variable rock type ore. These two types of ore represent the vast majority of the gold industry. The typical representatives are the Linglong and Xincheng gold mines. The chemical element composition of the gold concentrate is shown in Table 1 and Table 2, respectively. Table 1 Chemical element content of flotation concentrate in Linglong gold mine element Au(g/t) Ag(g/t) Cu Pb Zn content(%) 90.0 53.0 0.83 0.29 0.31 element Fe S As P Hg content(%) 27.80 31.60 0.02 0.03 <0.001 element Au(g/t) Ag(g/t) Cu Pb Zn S Fe content(%) 82.50 121.0 0.37 0.90 0.21 43.72 43.15 Also. Xiaoqinling area of gold mines such as Henan WENYU Qinling, Dongchuang like gold, containing multi-metal mining quartz vein-type deposits, gold, silver flotation concentrate rich in sulfur and other elements Fe Zn Pb, difficult to directly cyanide, The copper and lead must be recovered after calcination to remove copper and then cyanide to extract gold and silver. However, with social development and technological progress, the number of hundreds of tons of metal content of arsenic deposits, with the diversification and pre-engineering technology, but also production of gold flotation concentrate, since the late 1990s have After the birth of the bacterial oxidation of intellectual property in China - the cyanide carbon slurry process gold demonstration plant, this kind of gold concentrate has become a sought-after raw material. Data 2 describes the classification of pretreatment methods for refractory gold ore and gold concentrates. See Table 3. Table 3 Refractory gold ore and gold concentrate pretreatment method Pretreatment method Scope of application Bake and enrich Calcination oxidation Pressurized oxidation Biological oxidation Carbon immersion Ultrafine grinding Gold concentrate Sulfide-coated gold or carbon gold ore, gold concentrate Sulfide, antimony compounds wrapped gold ore, gold ore, this method can not be oxidized ores organic carbon The raw ore and gold concentrate of sulphide-coated gold can be stirred or heap leached. Can overcome medium carbon gold Finely wrapped gold ore and gold concentrate In kidney disease, blood levels of Phosphate may rise (called hyperphosphatemia) leading to bone problems. Calcium Acetate binds phosphate in the diet to lower blood phosphate levels. Calcium Acetate,Calcium Acetate Food Ingredient C4H6CaO4,Calcium Acetic Acid Salt 62-54-4,E263 Calcium Acetate Food Additive Jiangsu Kolod Food Ingredients Co., Ltd. , https://www.kolodchem.com
Table 2 Multi-element analysis results of cyanide ore from Xincheng Gold Mine
Some flotation gold concentrate containing high copper mine, or (as Inner clear water, Guangdong Gaoyao Hetai Gold, etc.), or with a higher silver (such as Zhejiang Suichang gold), or with a high lead ( For example, the Sanshandao Gold Mine in Shandong Province, although the cyanidation technology used in it is also a conventional cyanidation, it is necessary to adopt some special techniques or add some kind of passivating agent to make the process smooth and the index improved.
Calcium acetate is used as a food additive, as a stabilizer, buffer and sequestrant, mainly in candy products under the number E263.
Tofu is traditionally obtained by coagulating soy milk with calcium Sulfate. Calcium acetate has been found to be a better alternative; being soluble, it requires less skill and a smaller amount.
Calcium acetate was once a common starting material for the synthesis of acetone before the development.
A saturated solution of calcium acetate in alcohol forms a semisolid, flammable gel that is much like "canned heat" products such as Sterno.