201results about "Phosphorus oxides" patented technology

A system and method for providing intermediate reactive species to a reaction chamber are disclosed. The system includes an intermediate reactive species formation chamber fluidly coupled to the reaction chamber to provide intermediate reactive species to the reaction chamber. A pressure control device can be used to control an operating pressure of the intermediate reactive species formation chamber, and a heater can be used to heat the intermediate reactive species formation chamber to a desired temperature.

An equipment for recovering and utilizing the heat energy generated by burning yellow phosphorus and a system for preparing phosphoric acid by the hot method are disclosed. It is composed of steam manifold and burning tower with heat energy recovering function. The burning tower consists of ring-shaped membrane heat exchanger with fins, heat-insulaitng enclosed casing, P2O5 gas outlet tube, connecting tube of phosphorus sprayer, etc.. Its advantages include low consumption of coal, water and energy, low cost and reduced environmental pollution.

An optoelectronic device that includes a material having enhanced electronic transitions. The electronic transitions are enhanced by mixing electronic states at an interface. The interface may be formed by a nano-well, a nano-dot, or a nano-wire.

The invention relates to a process for producing a unique phosphation reagent and to a simple, single-stage process utilizing is reagent to produce alkyl phosphate esters having high monoalkyl phosphate content in combination with low dialkyl phosphate, trialkyl phosphate, phosphoric acid and residual alcohol.

Methods of producing fibrous solid carbon forests include reacting carbon oxides with gaseous reducing agents in the presence of a catalyst having a predetermined grain size to cause growth of fibrous solid carbon forests upon a surface of the metal. The fibrous solid carbon forests are substantially perpendicular to the surface of the metal thus creating the “forests”. A bi-modal forest composition of matter is described in which a primary distribution of fibrous solid carbon comprises the forest and a secondary distribution of fibrous solid carbon is entangled with the primary distribution. A reactor includes a catalyst, a means for facilitating the reduction of a carbon oxide to form solid carbon forests on a surface of the catalyst, and a means for removing the solid carbon forest from the surface of the metal catalyst.

Methods for purifying one or more value materials are provided. The method can include contacting an aqueous mixture comprising a value material and a contaminant with a dispersant and a depressant to produce a treated mixture. A weight ratio of the dispersant to the depressant can be from about 1:1 to about 30:1. The method can also include recovering a purified product comprising the value material from the treated mixture. The purified product can have a reduced concentration of the contaminant relative to the aqueous slurry.

Provided is a method for production of nanocrystalline hydroxyapatite particles, and nanocrystalline hydroxyapatite particles produced according to the method. The nanocrystalline hydroxyapatite particles exhibit substantially superior cell transformation abilities as compared to known and commercially-available calcium phosphate kits. The nanocrystalline hydroxyapatite particles also find use in tissue engineering applications, for example bone and tooth engineering and repair applications.

This invention is related to magnetic nanoparticles of hydroxyapatite for biomedical applications and the preparation method thereof. The magnetic particles of hydroxyapatite are prepared by a wet chemical co-precipitation method at lower temperature, wherein the calcium ions originally existing in hydroxyapatite are replaced with divalent or trivalent metal ions, for example, Fe+2 ion, to form magnetic nanoparticles of hydroxyapatite.

The present invention provides a method for advantageously producing an iron oxyhydroxide exhibiting excellent capability of adsorbing harmful substances, such as a phosphrous components and endocrine disrupting chemicals, which are contained in industrial wastewater, exhaust gases, etc., and an adsorbent material comprising the iron oxyhydroxide produced by the method as a main component. Specifically, the present invention provides an adsorbent material produced by a method comprising the steps of:

• • (a) adding a base to an aqueous iron ion-containing solution, adjusting the pH of the resultant mixture to 9 or less, to form a precipitate that contains an iron oxyhydroxide;
  • (b) drying the precipitate at a temperature of 100° C. or lower to obtain an iron oxyhydroxide;
  • (c) contacting the resultant iron oxyhydroxide with water; and
  • (d) subjecting the resultant iron oxyhydroxide to a heat treatment under a gas atmosphere having an inert gas concentration of 80% or greater at a temperature of 100 to 280° C.

The invention provides a method for recovering P2O5 in phosphorus ore dressing mill tailings, which relates to a method for utilizing mill tailings. The method uses a hydraulic cyclone for pre-treating and dividing the mill tailings into two parts (mill tailings smaller than 56 mum and mill tailings larger than 56 mum) by aiming at the mill tailings with the P2O5 content higher than 5 percent produced in the carbonate type phosphorite phosphorus ore dressing process, wherein the part of mill tailings smaller than 56 mum with a large amount of residual ore dressing agents directly enters the ore dressing step, and the part of mill tailings larger than 56 mum is milled again by a ball mill to present the size smaller than 56 mum for entering the ore dressing step. The method comprises the following steps: firstly, separating the mill tailings according to the coarse grain grade and the fine grain grade; and carrying out secondary milling by the coarse grain grade part. The invention solves the problem of ore monomer dissociation, the fine grain grade part does not participate in the ore milling, and the over-pulverization and the argillization of the ore are reduced. Through grading the mill tailings with a large amount of residual ore dressing agents, the ore dressing agents can be regenerated and reutilized through being separated with the fine grains from the coarse grains, and few collecting agents or no collecting agent can be added for secondary ore dressing of the mill tailings. The method improves the phosphorus ore recovery rate, reduces the discharge amount of the mill tailings, conforms to the requirements of circulation and economy, and is suitable for ore dressing enterprises.

A phosphorous pentoxide producing method includes forming a kiln bed using feed agglomerates with a calcium-to-silica mole ratio of from 0.5 to 1.0 and maintaining a bed temperature at or above 1260° C. along a portion of the bed length without exceeding 1380° C. along the entire bed length. Less than 10% of the agglomerates' phosphate input to the kiln remains in the kiln residue as phosphate. Another method includes maintaining a bed temperature at or above 1180° C. along a portion of the bed length and establishing a bed surface-to-volume ratio multiplied by a time for bed heat up to 1180° C. of less than 50 minutes-ft²/ft³.

The invention discloses a production method of phosphorus pentoxide by directly using phosphorus ore. Phosphorus ore and silica are mixed pro rata, delivered to a heating furnace to be heated and molten, after the molten mass flows into a reaction furnace, carbon is directly added into the high temperature molten mass, the carbon is kept to be excess, the temperature of the molten mass is controlled above 1200 DEG C, thereby leading the molten mass to generate reducing reaction, high temperature and high speed oxygen is sprayed downward into the molten mass through an upper spray gun, thereby providing oxygen for the oxidation of phosphorus vapor and carbon monoxide generated in the reducing zone, and a dished high temperature zone can be formed on the surface of the center of the molten mass, therefore, the heat transfer rate of the mass transfer in the reduction oxidation zone is greatly intensified, the finished quality is ensured, the percent reduction of the phosphorus ore is improved, and the continuous phosphorus pentoxide and phosphonic acid production can be realized. The invention has the advantages that the flow is simplified, the cost is reduced, the finished quality is improved, the percent reduction of the phosphor reaches 98 percent, the energy and resource are saved, the three wastes are basically eliminated, therefore, the invention provides the epoch-making revolution for the phosphor chemical engineering industry.

The invention is directed to a method of synthesizing silicoaluminophosphate molecular sieves using synthesis templates that contain at least one dimethylamino moiety, selected from one or more of N,N-dimethylethanolamine, N,N-dimethylpropanolamine, N,N-dimethylbutanolamine, N,N-dimethylheptanolamine, N,N-dimethylhexanolamine, N,N-dimethylethylenediamine, N,N-dimethylbutylenediamine, N,N-dimethylheptylenediamine, N,N-dimethylhexylenediamine 1-dimethylamino-2-propanol, N,N-dimethylethylamine, N,N-dimethylpropylamine, N,N-dimethylpentylamine, N,N-dimethylhexylamine and N,N-dimethylheptylamine. The use of dimethylamino moiety containing templates results in good quality SAPO molecular sieves of CHA framework type.

The invention discloses a double-region device for efficiently recovering yellow phosphorus combustion heat. The device comprises a support, a sufficient combustion region component, a convective heat transfer region component and a steam drum sequentially from bottom to top. One end of a sufficient combustion region down pipe is communicated with the steam drum while the other end of the sufficient combustion region down pipe is communicated with a lower header of the sufficient combustion region component. One end of a sufficient combustion region sufficient combustion region steam guide pipe is communicated with the steam drum while the other end of the sufficient combustion region steam guide pipe is communicated with an upper header of the sufficient combustion region component. One end of a convective heat transfer region down pipe is communicated with the steam drum while the other end of the convective heat transfer region down pipe is communicated with a cooling water inlet pipe of the convective heat transfer region component, one end of a convective heat transfer region steam guide pipe is communicated with the steam drum while the other end of the onvective heat transfer region steam guide pipe is communicated with a steam outlet pipe in the convective heat transfer region component, and a lower head of the sufficient combustion region component is connected with the support. The device is capable of achieving efficient recovery of the yellow phosphorus combustion heat, the theoretical recovery rate can reach more than 75%, energy saving and emission reduction of phosphoric-acid production by a hot method are promoted, and the device has wide application prospect in phosphoric-acid production by a hot method.

A method for controlling the formation of a hydroxyapatite bone filler from dry calcium phosphate precursors in an aqueous solution uses coated sodium phosphate powder. The sodium phosphate powder is coated with a water soluble cellulose. Until the cellulose dissolves in the aqueous solution setting of the calcium phosphate cements proceeds slowly but when the exposed sodium phosphate particles start to solubilize in the aqueous solution the setting rate increases.

Disclosed herein are a particle production method whereby spherical fine particles of a crystalline calcium phosphate-based compound can be efficiently produced at low cost, fine particles (especially, spherical particles) with good flowability produced by the particle production method, and a high-quality sintered body obtained by sintering a molded body of the particles. The particle production method comprises a first step of mixing a first substance containing phosphorus and a second substance containing calcium so that the phosphorus and the calcium are present in a predetermined mole ratio and feeding, into a heated atmosphere, droplets of a slurry containing an amorphous reaction product, obtained by the reaction between the first substance and the second substance, to bring the reaction product into a gaseous state; and a second step of crystallizing the reaction product in the gaseous state to obtain particles mainly composed of a calcium phosphate-based compound containing phosphorus and calcium in the predetermined mole ratio. The heated atmosphere preferably contains plasma produced by ionization of an ambient gas.

A producing method of a high-purity pyrophosphate comprising a calcination of the orthophosphate under the condition of 120° C.-350° C.; and a producing method suitable for manufacturing effectively the high-purity melamine pyrophosphate.

The invention discloses a method for producing phosphorus pentoxide by melting phosphate rock. Phosphate rock and silica are mixed in proportion, sent to a heating furnace for heating and melting, and after flowing into the reaction furnace, carbon is added to the molten material, and the temperature is controlled to 1200°C. As mentioned above, the molten material is reduced in the reduction zone of the reaction furnace to produce a mixed gas of P4 steam and CO and absorb heat. The gas is directly oxidized with the added oxygen in the oxidation zone of the reaction furnace to generate P2O5 and CO2 gas and release heat. The heat supply Heating the molten material and reducing the heat required by the reduction reaction, controlling the way of adding oxygen to the oxidation zone, maintaining the reducing atmosphere on the molten liquid interface of the reaction furnace, so that the reduction and oxidation reactions can be carried out smoothly, and the generated P2O5 gas is cooled and purified to obtain dioxide Phosphorus products. The invention has the advantages of simplifying the process, reducing the cost, improving the product quality, reducing the phosphorus to 98%, saving energy and resources, basically eliminating "three wastes", and bringing epoch-making changes to the phosphorus chemical industry.