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Sulphate precipitation from mine water as ettringite, Ca6Al2(SO4)3(OH)12пїЅ26H2O, is generally indicated to be implemented as a second treatment step, following the heavy metal precipitation or as a third step, after gypsum seeded crystallization. The whole process may be seen as complicated by the operators, which always prefer simpler flow sheets, with fewer steps and with lower investment cost, but this treatment process sequence is justified by sludge management depending on type and by the economic reasons re...