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    • 8. 发明申请
    • COMPOSITIONS AND METHODS FOR WASTE TREATMENT
    • 用于废物处理的组合物和方法
    • WO1994006575A1
    • 1994-03-31
    • PCT/AU1993000489
    • 1993-09-21
    • KYLE, James, HamiltonWHITE, Timothy, JohnEATON, Gregory, Francis
    • B09B03/00
    • C04B18/0463A62D3/33A62D3/38A62D2101/04A62D2101/40A62D2101/43A62D2101/45A62D2101/47A62D2203/02B09B3/0041C01B25/37C01B25/455C01G1/02C01G1/06C01G28/023C01P2006/60C04B2111/00784Y02W30/91C04B20/023C04B20/04
    • Methods for waste treatment and compositions of stabilized waste elements are provided, typically for the disposal of arsenical wastes. Arsenic trioxide waste produced as a by-product of metal extraction is slurried in water for from 6 to 24 hours with finely divided quicklime to produce nonvolatile calcium arsenate (III). An excess of CaO stoichiometry with As is used to consume secondary waste species such as sulphate, silicate and iron oxides. The precipitated arsenate is oven dried at 120 C and then calcined in air between 15 minutes to several hours at 1000 C to 500 C respectively to oxidize arsenate (III) to arsenate (V) as Ca5(AsO4)3(OH) (an apatite) as the major arsenic immobilization phase, with minor arsenic incorporated in Ca3(AsO4)2. Calcium sulphate anhydrate (sulphate immobilization) and calcium iron oxide (iron immobilization) are also produced. Tertiary immobilization is achieved milling or fracturing and incorporating the apatite an encapsulant consisting of ordinary portland cement and flyash. After curing for one month in steel drums in a water saturated atmosphere, the waste form is ready to be transported either to a repository or to be used as landfill. Further security may be achieved at the back end of the process by lining the repository with ferric clays that will strongly absorb and adsorb heavy metal species which may escape.
    • 提供废物处理方法和稳定废物元素的组成,通常用于处理砷废物。 作为金属提取副产物产生的三氧化二砷废水在水中制成6至24小时,并分散生石灰,生成不挥发性砷酸钙(III)。 过量的CaO化学计量与As一起用于消耗次生废物物质,如硫酸盐,硅酸盐和氧化铁。 将沉淀的砷酸盐在120℃下烘箱干燥,然后在空气中在1000℃至500℃下在15分钟至数小时之间煅烧,以将Ca(AsO 4)3(OH)(磷灰石)氧化成砷酸盐(III) )作为主要砷固定相,其中少量的砷掺入Ca3(AsO4)2中。 也产生硫酸钙无水物(硫酸盐固定)和氧化铁(铁固定化)。 三次固定实现了铣削或压裂,并将磷灰石作为由普通波特兰水泥和飞灰组成的密封剂。 在水饱和气氛中在钢桶中固化一个月后,废物形式准备运送到储存库或用作填埋场。 通过用强力吸收和吸附可能逸出的重金属物质的铁粘土衬里储存库,可以在该方法的后端实现进一步的安全性。