摘要:
A structure directing agent is removed from a microporous solid at a temperature below the temperature that would cause the structure directing agent to decompose by cleaving the structure directing agent within the pores of the microporous solid, at a temperature below the temperature that would cause the structure directing agent to decompose, into two or more fragments and removing the fragments from the pores of the microporous solid at a temperature below the temperature that would cause the structure directing agent or its fragments to decompose.
摘要:
The present invention relates general to a method for making an alkali metal hydrogen phosphate of the general formula AxH3nullxPO4, wherein A is an alkali metal and 0nullxnull3, prepared by admixing an alkali metal-containing compound, a phosphate-supplying compound, and water, where water is present in the mixture at a level of from about 5% to 25% by weight
摘要翻译:本发明涉及一种制备通式AxH3-xPO4的碱金属磷酸氢盐的方法,其中A为碱金属,0 <= x <= 3,其通过将含碱金属的化合物,磷酸盐 其中水以混合物中的约5重量%至25重量%的水平存在于水中
摘要:
The invention describes a method of preparing alpha- or beta-tricalcium phosphate, brushite (CaHPO4.2H2O), calcium pyrophosphate (Ca2P2O7) or hydroxyapatite (Ca5(PO4)3(OH)) or mixtures thereof in the form of morsels or granules via gelatin processing. These morsels or granules can be used as bone or tooth fillers or bone substitutes in applications, especially when higher rates of resorption or taking part in the bone remodelling processes of the implanted material are desired.
摘要:
A method of manufacturing a phosphate-bonded refractory product entirely during the mixing cycle by reacting phosphoric acid and alumina derived from one or more sources of finely divided reactive alumina, for example null-alumina and/or alumina hydroxide to form a proto aluminum orthophosphate gel or paste binder in the pan of a high-intensity mixer at ambient temperatures.
摘要:
A process for utilizing the material of ammonium-containing effluent which contains further soluble constituents and, possible additional solids, comprising: a) optionally separating off the solids, b) concentrating the substantially solids-free ammonium-containing effluent to give an aqueous concentrate having an increased content of ammonium and additional soluble constituents, with simultaneous recovery of substantially ammonium-free pure water, c) precipitating ammonium as magnesium ammonium phosphate from the ammonium-containing aqueous concentrate, and d) separating off precipitated magnesium ammonium phosphate with recovery of substantially ammonium-free residual concentrate which at least partially contains the further soluble constituents.
摘要:
Fluorapatite mineral deposits in middle Tennessee were formerly beneficiated by washing out most of the clay, but some of the clay remained in the beneficiated ore. The ore was agglomerated by heating to temperatures high enough to melt clay remaining in the ore thereby obtaining a fluid phase for agglomeration in rotary kilns. The agglomerated phosphatic material was mixed with silica rock and metallurgical coke and the mixture was smelted in electric furnaces to produce elemental phosphorus. The feedstock had a percent P O in the phosphate-plus-silica of about 25.7. Phosphate ore deposits amenable tp beneficiation by washing were used up. Furthermore, mud ponds containing the washed-out clay polluted ground water and water courses. An endeavor was made to smelt feedstock prepared from raw phosphate ore but the percent P O in the feedstock was too low for smelting. The present invention is a process for upgrading feedstock prepared from raw phosphate ore. Phosphorus sludge is burned to produce impure phosphoric acid and the acid is combined with beneficiated phosphate ore to prepare anhydrous monocalcium phosphate. Feedstock prepared from raw phosphate ore is blended with anhydrous monocalcium phosphate to upgrade the feedstock.
摘要:
The invention describes a wet-chemical process for the preparation of alpha- and beta-tricalcium phosphate (TCP) powders. The procedure simply comprises immediate addition of di-ammonium hydrogen phosphate to an aqueous solution of calcium nitrate tetrahydrate, or vice versa. Calcination of the recovered precursor powders at 800null C. in air produces beta-TCP, whereas the calcination of the same at 1200null C., followed by rapid cooling to room temperature yields submicron-particulated alpha-TCP powders. These powders can be the raw materials for bioceramics, such as artificial bones, artificial joints, artificial tooth roots, and calcium phosphate-based self-setting, self-hardening cements.
摘要:
Nanoscale and submicron particles have been produced with polyatomic anions. The particles can be crystalline or amorphous. The particles are synthesized in a flowing reactor, preferably with an intense light beam driving the reaction. In preferred embodiments, the particles are highly uniform. Batteries can be formed from submicron and nanoscale lithium metal phosphates. Coatings also can be formed from the particles.
摘要:
The invention is directed to a method of synthesising silicoaluminophosphate and aluminophosphate molecular sieves using synthesis templates that contain at least one template of general formula R1R2NnullR3, wherein R1 and R2 are independently selected from the group consisting of alkyl groups having from 1 to 3 carbon atoms and hydroxyalkyl groups having from 1 to 3 carbon atoms; R3 is selected from the group consisting of 4- to 8-membered cycloalkyl groups, optionally substituted by 1 to 3 alkyl groups having from 1 to 3 carbon atoms, and 4- to 8-membered heterocyclic groups having from 1 to 3 heteroatoms, said heterocyclic groups being optionally substituted by 1 to 3 alkyl groups having from 1 to 3 carbon atoms and the heteroatoms in said heterocyclic groups being selected from the group consisting of O, N, and S. In particular, the present invention relates to the synthesis of silicoaluminophosphate molecular sieves of the CHA framework type having a low silicon to aluminium atomic ratio.
摘要翻译:本发明涉及使用含有至少一个通式R 1 R 2 NR 3的模板的合成模板来合成硅铝磷酸盐和磷酸铝分子筛的方法,其中R 1和R 2是 独立地选自具有1至3个碳原子的烷基和具有1至3个碳原子的羟烷基; R 3选自任选被1至3个具有1至3个碳原子的烷基取代的4至8元环烷基和具有1至3个的4-至8-元杂环基 杂原子,所述杂环基团任选被1至3个具有1至3个碳原子的烷基取代,所述杂环基中的杂原子选自O,N和S.特别地,本发明涉及 合成具有低硅铝原子比的CHA骨架类型的硅铝磷酸盐分子筛。
摘要:
A mixture of two or more calcium phosphate compositions are combined with an aqueous solution and are useful as bone fillers on bone cements such as orthopedic and dental cements and remineralizers. The mixtures self-harden to substantially form hydroxyapatite, the mineral phase of bone and tooth enamel. The at least one or more of precursors is prepared in a manner resulting in its having an extremely low moisture level. The use of low moisture components results in an improved shelf life to the mixture.