摘要:
PCT No. PCT/AU93/00489 Sec. 371 Date May 1, 1995 Sec. 102(e) Date May 1, 1995 PCT Filed Sep. 21, 1993 PCT Pub. No. WO94/06575 PCT Pub. Date Mar. 31, 1995Methods 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 DEG C. and then calcined in air between 15 minutes to several hours at 1000 DEG C. to 500 DEG 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 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.
摘要:
The present invention relates to a method of making a mercury based compound, to a mercury based compound and to methods of using the mercury based compound and to uses of the mercury based compound.
摘要:
An approach is provided for generating mercury (II) sulfide from elemental mercury. Elemental mercury is injected into a reaction vessel containing vaporized sulfur. The elemental mercury reacts with at least a portion of the vaporized sulfur to form the mercury (II) sulfide.
摘要:
Dargestellt und beschrieben ist ein Verfahren zur Herstellung von Quecksilbersulfid zur anschließenden Entsorgung, wobei sich das Quecksilbersulfid während eines Reaktionsvorgangs in einem Reaktor (2) aus einer Reaktion von elementarem Quecksilber mit einem elementaren Schwefel und/oder eine Schwefelverbindung enthaltenden Zugabematerial ergibt. Erfindungsgemäß ist vorgesehen, daß der Reaktor (2) kontinuierlich mit dem Quecksilber und dem Zugabematerial beschickt wird, wobei das Quecksilber und das Zugabematerial im Reaktor (2) erwärmt und in einen gasförmigen Zustand überführt werden und wobei die Reaktion zwischen dem Quecksilber und dem Zugabematerial in der Gasphase erfolgt.
摘要:
A superconducting composition comprising an oxide complex of the formula [L1-xMx]aAbOy wherein L is lanthanum, lutetium, yttrium or scandium; A is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, or vanadium; M is baryum, strontium, calcium, magnesium or mercury; and ''a'' is 1 to 2; ''b'' is 1; ''x'' is a number in the range of 0.01 to 1.0; and ''y'' is about 2 to about 4. The oxide complexes of the invention are prepared by a solid-state reaction procedure which produce oxide complexes having enhanced superconducting transition temperatures compared to an oxide complex of like empirical composition prepared by a coprecipitation - high temperature decomposition procedure. With a solid-state reaction prepared oxide complex of the invention a transition temperature as high as 100 DEG K has been observed even under atmospheric pressure.