121 results about "Magnesium peroxide" patented technology

A wellbore fluid including a peroxide degradable polymer and an encapsulated peroxide source. The peroxide degradable polymer may be a polysaccharide. The peroxide source may include an inorganic peroxide, including zinc and alkaline earth metal peroxides, such as magnesium peroxide. The encapsulating material may be a polymer, including enteric polymers. The release of peroxide, from peroxide sources generally, can be controlled by means of pH such that peroxide source can be activated, and peroxide released, by a change in pH. In a wellbore, this pH change can be effected by using produced fluids to lower the pH of a more basic wellbore fluid.

Dental bleaching compositions, for example in the form of liquids, gels, creams, pastes and ointments, comprising a peroxide releasing compound and from 1% to 35% by weight of a potassium-containing compound such as potassium nitrate, wherein the potassium nitrate is present in a safe and effective amount to prevent tooth hypersensitivity in the patient during the bleaching process. The potassium nitrate contemplated by the invention is compatible with peroxide yielding bleaching compounds such as peroxide, carbamide peroxide, calcium peroxide, zinc peroxide, magnesium peroxide and sodium perborate. Potassium nitrate is complimentary and synergistic with the peroxide bleaching agents contemplated by the invention and enhances the release of oxygen to the tooth enamel. Also contemplated are methods of bleaching teeth comprising application of the dental bleaching compositions of the invention.

The invention discloses a novel oxygen fertilizer and preparation and application methods of the oxygen fertilizer. Mixtures of one or more of calcium peroxide, sodium peroxide and magnesium peroxide act as a core; nano chitosan doped with sodium alginate as the binding agent serves as a wrapping membrane; and the outer layer of the wrapping membrane is further wrapped by paraffin as a conditioner, so that a slow-release oxygen fertilizer is prepared. The oxygen fertilizer contains 70-75% of the core by weight, 20-25% of the wrapping membrane by weight, and 3-10% of the conditioner by weight and the particle diameter of the oxygen fertilizer particles is 3-10mm. The novel oxygen fertilizer prepared by the preparation method disclosed by the invention can supply oxygen to waterlogged plants for a long time and is convenient and simple to apply, simple in production process and environment-friendly, and saves time and labor and can be used widely.

The present invention belongs to a process for extracting and separating thorium from sulfo-phosphoric mixed acid and extracting rare earth chloride. Said process adopts primary amine added mixed alcohol as extracting agent, and makes direct fractionation of rare earth slurry to extract thorium, and the thorium content in the separated rare earth slurry is ThO2/REO is less than or equal to 5X10 to the minus sixth. Said invention utilizes the thorium being in organic phase and adopts countercurrent reextraction process by means of nitric acid to obtain thorium nitrate product, its purity is 99%, and thorium recovery is up to 99%. Said invention adopts magnesium oxide precipitation method to remove the iron and phosphorus in the rare earth reffinate, uses ammoniated P507-kerosene to extract organic phase.

The invention discloses a gas phase oxidization-liquid phase oxidization-absorption three-section type dry-wet-process flue gas denitration process. According to the process, ozone is used as a gas-phase oxidant to oxidize one part of nitric oxide in flue gas into high-valence-state nitric oxide capable of being absorbed by slurry; any one or a mixture solution of more of hydrogen peroxide, sodium hypochlorite, sodium chlorite, sodium chlorate, sodium persulfate, potassium chlorate, potassium hypermanganate and potassium dichromate is sprayed to be used as a liquid-phase oxidant to oxidize the residual high-valence-state nitric oxide in the flue gas into the high-valence-state nitric oxide; and the flue gas enters an absorption tower and a magnesium hydroxide solution is sprayed to absorb the high-valence-state nitric oxide. Compared with the prior art, the process firstly adopts two times of oxidization of a gas phase and a liquid phase and a magnesium oxide wet process is used for absorbing so that a target of efficiently removing the nitric oxide is realized; and by virtue of the technical scheme, the use amount of the ozone is reduced, the equipment cost and operation cost are reduced and the denitration efficiency is improved and can reach more than or equal to 93%.

A well treating fluid useful in slickwater fracturing processes contains polyacrylamide friction reducer and a viscosity breaker capable of reducing the viscosity of the well treating fluid to about the viscosity of water at ambient temperatures of typical underground formations. The viscosity breaker is selected from the group consisting of hydrogen peroxide, calcium peroxide, magnesium peroxide, and zinc peroxide and is present in an amount above about 0.002% by weight.

The invention discloses a compound high-temperature environment-friendly biomass fuel and a preparation method thereof. The compound high-temperature environment-friendly biomass fuel is composed of the following components in parts by weight: 25-35 parts of forestry and agricultural residues, 15-25 parts of household refuse, 15-25 parts of sludge, 15-25 parts of excrement, 15-25 parts of coal powder, 15-25 parts of scrap tire colloidal particle, and 2-10 parts of combustion improver; and the combustion improver is composed of dolomite dust, urea, red mud, calcium peroxide, manganese oxide, strontium peroxide, magnesium peroxide, cerium oxide, and boric sludge. The compound high-temperature environment-friendly biomass fuel is suitable for storing for a long time without foreign smell. The burning temperature of the compound high-temperature environment-friendly biomass fuel is high and is up to 1320-1380 DEG C, and the burning efficiency is improved by about 35% compared with that of the common biomass fuel; the calorific value is 4800-5200 kilocalorie/kg and per ton of the compound high-temperature environment-friendly biomass fuel is 0.7 ton of the standard coal; and the combustion gas is in accordance with the national related provisions, the sulphur removal rate is 98% and the nitrate removal rate is 95%.

The invention discloses an environment-friendly high-energy composite biomass fuel and a preparation method thereof. The environment-friendly high-energy composite biomass fuel contains the ingredients in parts by dry weight: 25-35 parts of agriculture and forestry wastes, 15-25 parts of domestic garbage, 15-25 parts of sludge, 15-25 parts of manure, 15-25 parts of coal powder, 15-25 parts of waste tire rubber particles and 2-10 parts of combustion improver, wherein the combustion improver is prepared from dolomite powder, black shale powder, serpentine powder, urea, potassium nitrate, red mud, calcium peroxide, manganese oxide, strontium peroxide, magnesium peroxide, cerium oxide and boric sludge. The environment-friendly high-energy composite biomass fuel disclosed by the invention is suitable for long-term storage and is free from odor generation. According to the environment-friendly high-energy composite biomass fuel disclosed by the invention, the combustion temperature is high and can reach 1,350-1,400 DEG C, and the combustion efficiency is increased by about 35% compared with that of ordinary biomass fuels; the calorific value can reach 4,900-5,300 kilo-calories per kilogram, and the environment-friendly high-energy composite biomass fuel per ton is equivalent to 0.7 ton of standard coal; combustion exhaust gases all meet relevant national provisions , the desulfurization ratio can reach 98%, and the denitrification ratio can reach 95%.

The invention discloses an acid reduction and humidity regulation method for the red upland soilred-soil dryland. The red upland soilred-soil dryland is covered by straws. The acid reduction and humidity regulation method for the red upland soilred-soil dryland is characterized in that alkaline acid reduction and humidity regulation composite modifying agent is applied to the red upland soilred-soil dryland before the red upland soilred-soil dryland is covered by straws; the alkaline acid reduction and humidity regulation composite modifying agent is one of calcium peroxide and magnesium peroxide; and 5.8-8.0kg of alkaline acid reduction and humidity regulation composite modifying agent is applied to each unit of area. According to the acid reduction and humidity regulation method for the red upland soilred-soil dryland, the alkaline acid reduction and humidity regulation composite modifying agent reacts with water in soil so as to provide OH<->, neutralize parts of H<+>, generate alkaline inorganic matter and oxygen and release heat; in the slow oxygen releasing process, the soil acidity is lowered, the soil redox potential is changed, the water and air ratio of the soil is regulated, the acid reduction and humidity regulation effects isare simultaneously generated to the red upland soilred-soil dryland, and the acidity, the temperature and the moisture of the red upland soilred-soil dryland covered by the spring straw can be obviously improved so as to accelerate agricultural synergy and farmer income increment; and in addition, calcium or magnesium nutrition can be provided for the crop growth and development, thereby being favorable for improving the resource use ratio.

The invention provides a method for preparing magnesium peroxide by a non-emulsion process. The method comprises the following steps: taking organic phosphonic acid and salts thereof or inorganic phosphonic acid and salts thereof as a stabilizer, taking soluble magnesium salts, hydrogen peroxide solution and base as raw materials, and reacting in an aqueous solution system for 2-10h with the system temperature controlled at 10-30 DEG C; filtering, washing and drying the reaction products to obtain white magnesium peroxide powder. The method is characterized by taking soluble magnesium salts as raw materials for preparing magnesium peroxide, which avoids high cost and low utilization ratio of hydrogen peroxide due to taking magnesia as raw materials; the magnesium peroxide content of the obtained product is more than 40%, the production process is simple, energy consumption is low, and the method is applicable to large-scale industrial production.

The present invention relates to an improved preparation process of magnesium peroxide. The process is characterized by that dilute hydrogen peroxide solution, magnesia, powder as raw material and organic phosphonic acid and its salt as stabilizer are added to produce wet magnesium peroxide, which is dried to obtain white magnesium peroxide powder. The added amount of phosphonic acid and its saltby weight of P2O5 is 0.01-1.5 wt% of magnesia. By the process stability of magnesium peroxide is raised during reaction to produce magnesium peroxide product with magnesium peroxide content over 30%.In addition, the process is simple, low in power consumption and high in yield and is suitable for large scale production.

The invention relates to a preparation method for nano magnesium peroxide. Using magnesium oxide, ammonium chloride, and oxydol with mass percentage of 30% according to the mass ratio of 1:(1.5-2.5):(30-40); dissolving the magnesium oxide into deionized water and grinding into magnesium oxide size mixture with the mass percentage of 3-4%; dissolving the ammonium chloride into the oxydol, and stirring and slowly adding into the ground magnesium oxide size mixture; keeping the reaction under the continuous stirring at 500 r/min for 3-4 h to obtain white precipitate mixed solution; filtering the white precipitate mixed solution to obtain a wet filter cake; performing freezing vacuum drying at -80 DEG C to obtain a target product of nano magnesium peroxide powder with particle size of 20 nm, good dispersity, and purity higher than 50%. The method is simple to operate and is suitable for large-scaled industrialized production.

A wellbore fluid including a peroxide degradable polymer and an encapsulated peroxide source. The peroxide degradable polymer may be a polysaccharide. The peroxide source may include an inorganic peroxide, including zinc and alkaline earth metal peroxides, such as magnesium peroxide. The encapsulating material may be a polymer, including a metal crosslinked acrylic polymer. The release of peroxide, from peroxide sources generally, can be controlled by means of pH such that peroxide source can be activated, and peroxide released, by a change in pH. In a wellbore, this pH change can be effected by using produced fluids to lower the pH of a more basic wellbore fluid.

An oxidative breaker system for use in reducing the viscosity of a polysaccharide-based or derivatized polysaccharide-based suspension includes a silicone carrier fluid, an oxidizer, and a suspension aid. The suspension aid is preferably fumed silica. The oxidizer may be selected from the group consisting of alkali metal peroxide, transition metal peroxide, persulfate compound, bromide compound, and bromate compound. In highly preferred embodiments, the oxidizer is magnesium peroxide or calcium peroxide. Alternative carrier fluids and suspension agents are also included in the art. Also disclosed is a method for breaking a polysaccharide-based suspension with the inventive oxidative breaker system.

Dental bleaching compositions, for example in the form of liquids, gels, creams, pastes and ointments, comprising a peroxide releasing compound and from 1% to 35% by weight of a potassium-containing compound such as potassium nitrate, wherein the potassium nitrate is present in a safe and effective amount to prevent tooth hypersensitivity in the patient during the bleaching process. The potassium nitrate contemplated by the invention is compatible with peroxide yielding bleaching compounds such as peroxide, carbamide peroxide, calcium peroxide, zinc peroxide, magnesium peroxide and sodium perborate. Potassium nitrate is complimentary and synergistic with the peroxide bleaching agents contemplated by the invention and enhances the release of oxygen to the tooth enamel. Also contemplated are methods of bleaching teeth comprising application of the dental bleaching compositions of the invention.

A dissolved oxygen releasing blend is disclosed utilizing magnesium peroxide blended with powdered Bentonite and/or vegetable oil. The Bentonite (or other clay material) reduces the hydraulic conductivity of magnesium peroxide, thereby reducing the rate of magnesium peroxide disassociation.

The invention discloses a chlorine salt acid system prior complexing-selective iron precipitation chromium-iron separation method. Sodium formate and the like are used as a complexing agent; and the proper complexing agent is selected to perform prior complexing for iron in hydrochloric acid solution to change the ion existence form so as to prevent quick mass hydrolytic precipitation of iron in the precipitating phase and the caused chromium inclusion loss. The method improves the iron ion complexing effect through adjusting the complexing agent and the use level thereof, the original solution pH, the complexing temperature and the complexing time, and adjusts the solution pH value through such alkali mediums as magnesium oxide to realize prior iron hydrolytic precipitation and effective chromium separation. The chromium solution after solid-liquid separation can be directly used for preparing different chromium salts. Compared with other traditional technologies, the method is simple in operation process, needs no special complex equipment, and is a new method with economy, effectiveness and operation easiness.

The invention provides a decomposition method for rare earth ore concentrate. The method comprises the following process steps: (1) mixing mixed rare earth ore concentrate with concentrated sulfuric acid according to mass ratio in an electric heating decomposer; (2) heating the material with resistance heat generated by current flowing through the material after energization of the electric heating decomposer; (3) leaching output roasted ore by water; and neutralizing the solution with magnesium oxide to obtain iron phosphate, thorium phosphate precipitate and phosphorus phosphate precipitate; (4) removing sulfuric acid mist and dust in roasting tail gas; then spraying with liquid caustic soda to absorb fluorine, so as to precipitate sodium acid fluoride; and emptying the gas with acid and fluoride removed; and (5) cleaning and discharging the leached slag. The method provided by the invention employs electric heating to substitute fuel burning heating to lower processing capacity of waste gas and wastewater to 5% of that of an original process, so as to save energy, investment and operation cost; waste gas and waste residue reach discharge standards, and waste water can be recycled; and recovery rate of rare earth, thorium and fluorine is improved, so as to solve the problem of reuse of thorium and fluoride.