| 摘要 |
<p>This invention relates, in a general sense, to the recovery of Mg(OH) 2 from barren liquors, formed by base metal precipitation, that normally accumulate in a tailings dam. The invention provides a method of recovering Mg(OH) 2 from a liquor formed in a base metal precipitation circuit, which includes the steps of: a) using Mg(OH) 2 to precipitate base metal from a liquor which contains a base metal-sulphate, thereby producing a solution which contains Mg2+; (b) precipitating Mg2+ by the addition of lime to the solution, thereby producing a stream which contains Mg(OH) 2 and gypsum; and (c) separating Mg(OH) 2from gypsum in the stream. BM-SULPHATE2 BM PRECIPITATION 14 WITH Mg(OH) 2 BM-OH AND MgSO4 18 Mg(OH) 2 RICH SOLID/LIQUID SEPARATION STEP 20 PRECIPITATE >1INTERMEDIATE PRODUCT GYPSUM Mg2. CONTAINING 22 40 SEPARATION OF CT 24 GYPSUM & Mg(OH) 2 PRECIPITATION WITH ------- ------- EXCESS WATER GP28 30 34 32 STREAM CONTAINING TIKNRWET SOLIDS (GYPSUM GYPSUM & Mg(OH)2 TIKNR& Mg(OH)2</p> |
