公开(公告)号：AU710739B2

公开(公告)日：1999-09-30

申请号：AU6727696

申请日：1996-08-28

Applicant: UNIV WESTERN AUSTRALIA

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

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

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 nano-phase substance and the reaction by-product phase. The step of removing the by-product 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 nano-phase substance and the reaction by-product phase.

公开(公告)号：CA2246612A1

公开(公告)日：1997-08-21

申请号：CA2246612

申请日：1997-02-11

Applicant: QUEENSLAND ALUMINA LTD ,  UNIV WESTERN AUSTRALIA

Inventor： PICARO TONY ,  MCCORMICK PAUL GERARD

IPC: C01F7/06

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.

公开(公告)号：AU1585497A

公开(公告)日：1997-09-02

申请号：AU1585497

申请日：1997-02-11

Applicant: QUEENSLAND ALUMINA LIMITED ,  UNIV WESTERN AUSTRALIA

Inventor： PICARO TONY ,  MCCORMICK PAUL GERARD

IPC: C01F7/06

公开(公告)号：CA2152081A1

公开(公告)日：1994-07-07

申请号：CA2152081

申请日：1993-12-17

Applicant: TECH RESOURCES PTY LTD ,  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: A process for the treatment of toxic materials, for example, inorganic compounds, halogenated organic compounds such as polychlorinated biphenyl (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.

公开(公告)号：NZ231941A

公开(公告)日：1993-02-25

申请号：NZ23194189

申请日：1989-12-21

Applicant: UNIV WESTERN AUSTRALIA

Inventor： MCCORMICK PAUL GERARD ,  SCHAFFER GRAHAM BARRY

IPC: C01G3/00 ,  B22F1/00 ,  B22F9/04 ,  B22F9/18 ,  B22F9/20 ,  C01G1/00 ,  C04B20060101 ,  C04B35/00 ,  C04B35/45 ,  C04B35/65 ,  C22B20060101 ,  C22B5/00 ,  C22B5/04 ,  C22B5/12 ,  C22C20060101 ,  C22C1/00 ,  C22C1/04 ,  C22C1/05 ,  C22C1/10 ,  H01L39/24 ,  C22C1/06 ,  C22B5/02

Abstract: PCT No. PCT/AU89/00550 Sec. 371 Date Aug. 19, 1991 Sec. 102(e) Date Aug. 19, 1991 PCT Filed Dec. 21, 1989 PCT Pub. No. WO90/07012 PCT Pub. Date Jun. 28, 1990.A process for the production of a metal product which comprises subjecting a mixture of at least one reducible metal compound and at least one reducing agent to mechanical activation to produce a metal or alloy. Preferably, the mechanical activation is performed in an inert or reducing atmosphere. More than one reducing agent may be used. A ceramic material may be produced by including a nonmetal, or a compound which provides the nonmetal, into the starting materials. At least one other metal or a metalloid may be included in the starting materials for incorporation into the final product.