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Gypsum Precipitation Process Mining

acid mine drainage: case study of one of the largest,operation of the two-stage membrane process with and without pre-softening. additional tests on the reverse osmosis brine were successfully conducted to post-precipitation the super-saturated gypsum and further reduce the concentration of sulphate. introduction mining operations are often a.sulphate removal from mine water with chemical, biological,if sulphate concentration of feed solution is high, as in this study, gypsum precipitation should be carried out before ettringite precipitation in order to decrease operational costs of the process. the first step of the ettringite precipitation process (figure 4(b)) is gypsum precipitation. the solution containing 1.8 g/l sulphate is further precipitated using lime and sodium aluminate at ph 12 as.ettringite precipitation – mine closure,in addition, some of the known processes apply initial precipitation of some of the sulphate as gypsum and precipitation of metals as hydroxides in a gypsum matrix before the actual ettringite precipitation. (bowell 2004) calcium sulphate has a solubility of approximately 2,000 mg/l as sulphate..outotec sulfate removal process,for reuse. the process consists of a sulfate precipitation stage at ph 11-13 using lime milk and aluminum, followed by a final neutralization stage using carbon dioxide. gypsum precipitation can be included before the sulfate removal stage, when required. our process is easy and flexible with simple and under-standable chemistry..

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