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    • 6. 发明申请
    • LIQUID AND SOLID EFFLUENT TREATMENT PROCESS
    • 液体和固体废物处理过程
    • WO2009089613A1
    • 2009-07-23
    • PCT/CA2009000001
    • 2009-01-15
    • VALE INCO LTDEVELIN SALOMAO SOLINOSILVA ROBERTO MATTIOLI
    • EVELIN SALOMAO SOLINOSILVA ROBERTO MATTIOLI
    • C22B3/20C02F1/26C02F1/52C02F1/58C22B3/04C22B3/22C22B3/46C22B23/00C22B26/22
    • C01B17/20C01C1/24C01F5/08C01F11/46C02F1/441C02F1/444C02F1/5236C02F1/5254C02F1/72C02F9/00C02F2101/20C02F2103/16C22B3/44C22B3/46C22B7/006C22B23/043C22B23/0453C22B23/0461Y02P10/234
    • A process for recovering metals such as Ni, Co, Mn, Cu, Zn, among others, through precipitation as sulphides, enabling recovery of magnesium in the form of hydroxide, carbonate and oxide and providing recovery of sulphate as gypsum and ammonium sulphate. Liquid phase, after full treatment, comprises recovered water with a quality proper for total reuse in Industrial process. This process of liquid and solid effluent treatment is provided with flexibility to process several types of effluents presenting wide variations in their chemical composition. The main steps of this process are (1) equalization of liquid effluent, (2) precipitation of metals as sulphides, (3) oxidation of metallic sulphides and crystallization as metallic sulphates, (4) precipitation of magnesium as hydroxide and calcination thereof into magnesium oxide (5) recovery of ammonia, (6) preconcentration of the remaining saline solution, (7) evaporation/crystallization of ammonium sulphate, (8) storage of recovered water, (9) partial or total precipitation of sulphate contained m the effluent with quicklime, (10) segregated storage of gypsum and gypsum-magnesium mixture, (11) softening of the remaining solution and (12) storage of softening water
    • 一种通过沉淀为硫化物回收金属如Ni,Co,Mn,Cu,Zn等的方法,能够回收氢氧化物,碳酸盐和氧化物形式的镁,并提供回收硫酸盐如石膏和硫酸铵。 液相经充分处理后,含有回收水,其质量适合工业过程中的全部再利用。 这种液体和固体废水处理过程具有灵活性,以处理几种类型的流出物,其化学组成有很大的变化。 这个过程的主要步骤是:(1)液体流出物的平衡,(2)金属沉淀为硫化物,(3)金属硫化物的氧化和结晶为金属硫酸盐,(4)氢氧化镁沉淀镁并将其煅烧成镁 (5)氨的回收,(6)剩余盐溶液的预浓缩,(7)硫酸铵的蒸发/结晶,(8)回收水的存储,(9)流出物中含有的硫酸盐的部分或全部沉淀, 生石灰,(10)石膏和石膏 - 镁混合物的分离储存,(11)剩余溶液的软化和(12)软化水的储存