A room temperature stable, substantially phase pure α-C₃P product is provided, which may be included in a reactive composition suitable for preparation of calcium phosphate cements. The α-C₃P product may be obtained by heating a tricalcium phosphate source to a temperature sufficient to convert substantially all of the tricalcium phosphate source to a substantially phase pure α-C₃P product. The temperature of the resultant product is rapidly cooled to a temperature below about 700°C, resulting in the room temperature stable, α-C₃P product. The resultant α-C₃P product may be milled to provide a composition suitable for use in cement production.

A calcium phosphate cement suitable for use in dental and bone prosthesis is disclosed, which include calcium phosphate particles having a diameter of 0.05 to 100 microns, wherein said calcium phosphate particles on their surfaces have whiskers or fine crystals having a width ranging from 1 to 100 nm and a length ranging from 1 to 1000 nm..

The present invention provides a calcium phosphate cement capable of forming a high-strength hardened material, and is formulated by mixing the product of a hydration reaction between dibasic calcium phosphate and α-tribasic calcium phosphate in an amount of 2 to 10 mass%, tetrabasic calcium phosphate in an amount of 10 to 25 mass%, and dibasic calcium phosphate in an amount of 3 to 10 mass%, with the remainder comprising α-tribasic calcium phosphate.

An inorganic binder system for foundry compositions including a silicate and added phosphate. The composition produces a binder having the advantageous strength properties of a silicate binder system with the dispersibility properties of a phosphate binder system. Methods of making and using the binder systems and the resulting products are of particular interest to the foundry art.

improved magnesium phosphate fast-setting cements can be prepared by treating ammonium phosphate fertilizer solution with an effective amount of an acidic phosphate additive. This additive can include polyphosphoric acid, orthophosphoric acid, monoammonium phosphate, monomagnesium phosphate and mixtures thereof. The fertilizer solution is treated with sufficient additive to reduce the pyrophosphate content of the fertilizer below 8 weight percent expressed as

P₂0₅. The treated ammonium phosphate fertilizer solution is capable of forming a fast-setting cement at ambient temperatures when mixed with a magnesium-containing compound and an optional aggregate.

A solid phosphorus pentoxide containing material suitable for use in fast-setting cements can be produced by a process which comprises mixing a porous material with a liquid, phosphorus pentoxide containing material and heating the mixture until a dry solid is produced.

The solid phosphorus pentoxide containing material thus formed can then be dry blended with a solid component comprising magnesium oxide, magnesium hydroxide, magnesium carbonate or mixtures thereof. An aggregate can optionally be added into this dry blend.

The components of the resulting dry blend react in the presence of an aqueous component to form a monolithic solid.

A self setting composition comprises a basic component e.g. magnesia and an acidic component which, according to the invention, comprises a dihydrogen phosphate, a trivalent salt of phosphoric acid and a polyphosphate and/or an alkyl acid phosphate.

Provided is a ternary inorganic compound crystal having a molecular formula of Ca₈Al₁₂P₂O₃₁, and a preparation method thereof comprising the following steps: weighing calcium salts, aluminum salts and phosphate respectively according to the molar ratio of calcium, aluminum and phosphorus in the molecular formula Ca₈Al₁₂P₂O₃₁; calcining at 1550∼1570°C, cooling, and grinding to obtain the ternary inorganic compound crystal. Also provided is an application of the ternary inorganic compound in gelling materials and molecular sieves, nonlinear optical crystals, and photochromic materials.

The invention provides systems, processes and methods for converting heterogeneous coal-fired power plants to cogenerate a sustainable, consistent, and economic cement. Such cogeneration enables a simultaneous production of both electric power and cement and thus provides significant economic and environmental efficiencies and benefits and eliminates a major source of greenhouse gas emissions and thereby mitigates a major contributor to climate change.