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    BAUXITE TREATMENT
    1.
    发明公开
    BAUXITE TREATMENT 失效
    处理铝土矿

    公开(公告)号：EP0880468A4

    公开(公告)日：1999-05-12

    申请号：EP97902108

    申请日：1997-02-11

    Applicant: QUEENSLAND ALUMINA LIMITED ,  UNIV WESTERN AUSTRALIA

    Inventor： PICARO TONY ,  MCCORMICK PAUL GERARD

    IPC: C01F7/06

    CPC classification number: C01F7/0613

    Abstract: Prior to the digestion of bauxite (which contains silica) in a digestion solution such as caustic soda for the production of aluminium oxide, the bauxite is mechanically activated to induce a mechanochemical reaction in the presence of a reagent such as lime. At least a portion of the silica is rendered insoluble and unreactive to the formation of sodium-aluminium-silicate desilication product (DSP) during subsequent digestion of the bauxite in the digestion solution.

    PROCESS FOR THE PRODUCTION OF ULTRAFINE PARTICLES
    5.
    发明专利
    PROCESS FOR THE PRODUCTION OF ULTRAFINE PARTICLES 未知

    公开(公告)号：CA2230443A1

    公开(公告)日：1997-03-06

    申请号：CA2230443

    申请日：1996-08-28

    Applicant: UNIV WESTERN AUSTRALIA

    Inventor： MIAO WIE-FANG ,  MCCORMICK PAUL GERARD ,  STREET ROBERT ,  DING JUN

    IPC: B22F1/00 ,  B22F9/00 ,  B22F9/04 ,  B22F9/16 ,  B22F9/20 ,  C01F7/02 ,  C01F17/00 ,  C01G9/08 ,  C01G25/02 ,  C01G49/06 ,  C04B35/10 ,  C04B35/48 ,  C04B35/50 ,  C04B35/622 ,  C04B35/626 ,  C22B5/02 ,  C22B5/04 ,  C22B15/00 ,  C22B23/02 ,  C22B61/00 ,  C22C1/04 ,  C22C33/02 ,  C22C38/08 ,  C22C1/00

    Abstract: A new, cost effective process for the production of ultrafine particles which is based on mechanically activated chemical reaction of a metal compound with a suitable reagent. The process involves subjecting a mixture of a metal compound and a suitable reagent to mechanical activation to increase the chemical reactivity of the reactants and/or reaction kinetics such that a chemical reaction can occur which produces a solid nano-phase substance. Concomitantly, a by-product phase is also formed. This by-product phase is removed so that the solid nano-phase substance is left behind in the form of ultrafine particles. During mechanical activation a composite structure is formed which consists of an intimate mixture of nano-sized grains of the nanophase substance and the reaction by-product phase. The step of removing the byproduct phase, following mechanical activation, may involve subjecting the composite structure to a suitable solvent which dissolves the by-product phase, while not reacting with the solid nano-phase substance. The process according to the invention may be used to form ultrafine metal powders as well as ultrafine ceramic powders. Advantages of the process include a significant degree of control over the size and size distribution of the ultrafine particles, and over the nature of interfaces created between the solid nanophase substance and the reaction by-product phase.

    9.
    发明专利
    未知

    公开(公告)号：BR9307665A

    公开(公告)日：1999-08-31

    申请号：BR9307665

    申请日：1993-12-17

    Applicant: UNIV WESTERN AUSTRALIA

    Inventor： DONECKER PETER ,  MCCORMICK PAUL GERARD ,  STREET ROBERT ,  ROWLANDS SALLY-ANNE

    IPC: A62D3/00 ,  A62D3/30 ,  A62D3/36 ,  A62D3/37 ,  A62D3/38 ,  A62D101/02 ,  A62D101/20 ,  A62D101/22 ,  A62D101/26 ,  A62D101/28 ,  B01D53/70 ,  B09B3/00

    Abstract: PCT No. PCT/AU93/00660 Sec. 371 Date Aug. 16, 1995 Sec. 102(e) Date Aug. 16, 1995 PCT Filed Dec. 17, 1993 PCT Pub. No. WO94/14503 PCT Pub. Date Jul. 7, 1994A process for the treatment of toxic materials, for example, inorganic compounds, halogenated organic compounds such as polychlorinated biphenyls (PCBs), dioxin and dichlorodiphenyl trichloroethane (DDT) and chemical weapons such as Sarin and mustard. The process is based on the discovery that mechanical activation can induce chemical reactions which break down the molecular structure of toxic materials and form products which are simple, non-toxic compounds. The process involves subjecting a mixture of a toxic material and a suitable reagent to mechanical activation to produce a non-toxic end product or products. Mechanical activation is typically performed inside a mechanical mill, for example, a ball mill. Ball milling of various toxic materials with appropriate reagents was found to result in virtual total destruction of the toxic starting material.

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