Abstract:
The specification discloses a process for stabilising radionuclides extracted during the upgrading of minerals. The process comprises forming a composition of a radionuclide and a component and roasting the composition so that the component forms a crystalline phase having a structure that binds the radionuclides. Suitable components include a compound of a lanthanide and/or phosphorus and zirconia. Zirconia in its cubic form is useful in stabilising uranium and thorium.
Abstract:
PCT No. PCT/AU94/00366 Sec. 371 Date Jul. 9, 1996 Sec. 102(e) Date Jul. 9, 1996 PCT Filed Jun. 30, 1994 PCT Pub. No. WO95/01313 PCT Pub. Date Jan. 12, 1995A process for producing a zirconia beating opacifier is disclosed. The process comprising the steps of: (I) heat treatment of a zirconia bearing material comprising heating the zirconia bearing material in the presence of an additive to form a heat modified product having one or more phases which, when incorporated in a glaze and the glaze fired, exhibit opacifying characteristics; and (ii) cooling the heat modified product to produce a product which can be used for imparting opacity.
Abstract:
A process for upgrading a titaniferous material by removal of impurities from the titaniferous material is disclosed. The process comprises alternate leaching of the titaniferous material in a caustic leach and a pressure sulphuric acid leach.
Abstract:
The application discloses a process for upgrading a titaniferous material by removal of impurities contained in the material especially radionuclides. The process involves heating the titaniferous material to a temperature of less than 1300 C to form a solid titaniferous phase and a liquid oxide or glassy phase in the presence of a material that promotes the formations of such phases, cooling the product at a rate that maintains the glassy phase in an amorphous state and leaching the solidified material with an acid or an alkali to remove the impurities. Materials that promote the formation of the desired phases include compounds of alkali metals and boron. Examples include borax, caustic soda, soda ash and silica.
Abstract:
A PROCESS FOR PRODUCING A ZIRCONIA BEARING OPACIFIER IS DISCLOSED. THE PROCESS COMPRISES THE STEPS OF: ( I )HEAT TREATMENT OF A ZIRCONIA BEARING MATERIAL COMPRISING HEATING THE ZIRCONIA BEARING MATERIAL IN THE PRESENCE OF ADDITIVE TO FORM A HEAT MODIFIED PRODUCT HAVING ONE OR MORE PHASES WHICH, WHEN INCORPORATED IN A GLAZE AND THE GLAZE AND THE IS FIRED, EXHIBIT OPACIFYINGCHARACTERITICS; AND( II )COOLING THE HEAT MODIFIED PRODUCT TO PRODUCE A PRODUCT WHICH CAN BE USED FOR IMPARTING OPACITY.
Abstract:
PCT No. PCT/AU94/00241 Sec. 371 Date Apr. 1, 1996 Sec. 102(e) Date Apr. 1, 1996 PCT Filed May 9, 1994 PCT Pub. No. WO94/26944 PCT Pub. Date Nov. 24, 1994A process for removing impurities from a titaniferous material that has been subjected to thermal reduction and which includes a titaniferous phase of general formula M3O5. The thermally reduced titaniferous material is subjected to a secondary heat treatment to covert the M3O5 phase to a more readily leachable M2O3 phase. This material is then cooled and leached in an aqueous acid solution containing hydrochloric acid or sulfuric acid, and the leachate is separated from the titaniferous material to form a purified titaniferous material.