179 results about "Barium peroxide" patented technology

A single-layered three-way catalytic converter containing palladium as the only catalytically active noble metal, with high activity and heat resistance. The catalyst contains, in addition to finely divided, stabilized aluminum oxide, at least one finely divided cerium/zirconium mixed oxide and optionally finely divided nickel oxide as well as highly dispersed amounts of cerium oxide, zirconium oxide and barium oxide. The palladium is distributed largely uniformly throughout the entire catalyst.

In the production process of lithium hydroxide monohydrate, lithium sulfate solution and caustic soda are made to produce metathetic reaction to form mixture solution of sodium sulfate and lithium hydroxide, and sodium sulfate and lithium hydroxide monohydrate are then separated by means of the obvious difference in low temperature solubility. The production process includes the following steps: adding sodium hydroxide into lithium sulfate solution obtained through serial production steps to obtain mixture solution of sodium sulfate and lithium hydroxide; cooling to minus 10 deg.c to 5 deg.c for the crystallization and separation of sodium sulfate; heating to concentrate the separated clear liquid; crystallization and separation to obtain coarse lithium hydroxide monohydrate product; water dissolving coarse lithium hydroxide monohydrate, adding barium hydroxide to form insoluble barium sulfate, filtering, concentrating filtrate, crystallizing to separate wet lithium hydroxide monohydrate; and drying.

The invention discloses a manufacturing technology of barium metaphosphate, which comprises the following steps: putting barium hydroxide in the container; adding the deionized water and active carbon to stir and heat with 1.05-1.10 specific gravity until the barium hydroxide is dissolved completely; stewing; filtering; obtaining fine barium hydroxide with iron, bronze, nickel, manganese and cobalt less than 0.0003 percent; putting the barium hydroxide in another container to stir and add high-quality phosphate; adjusting the pH value at 9-11 to obtain the deposition of barium hydrophosphate; adding the deionized water to dilute; obtaining the mixing paste of barium hydrophosphate; drying and condensing into barium metaphosphate by centrifugal spray. The technology is easy to adjust and control, whose production impurity content is low and recovery rate is high.

A process for preparing lead-free glass powder used for electronic paste, which comprises: firstly uniformly mixing silicon dioxide or sodium silicate, barium oxide or barium carbonate, boron oxide or boric acid, bismuth oxide or bismuth sulfate, aluminum oxide, aluminum sulfate or aluminum silicate, zinc oxide or zinc carbonate, sodium oxide, sodium carbonate or sodium bicarbonate, potassium oxide or potassium carbonate and titanium dioxide, then heating the mixed raw materials to melt, cooling the melted mixture, then grinding into power by a ball grinder, sieving by a sieve of 100-400 eye and lastly drying glass powder to obtain the lead-free glass powder. Because the glass power of the invention does not contain lead oxide (PbO) or compounds of lead oxide (PbO), the invention is harmless in the manufacture process of paste, simultaneously is beneficial for environmental protection, and is convenient for recycling and reusing electronic product modules containing the electronic paste.

The invention relates to a precious-metal recovery method, specifically relates to a method of recovering platinum/rhodium from insoluble residue of dualistic royal water for solving problems of the existing platinum/rhodium recovering method that the process flow is lengthy and complicated, operational process is dangerous, the isolation effect is bad, and the like. The method comprises steps of preprocessing the insoluble residue of royal water by using barium superoxide, oxidizing the platinum and rhodium thereof, dissolving the oxidized platinum and rhodium in hydrochloric acid; using ammonium chloride to deposit platinum after being converted to a sodium type, adding hydrazine hydrate for recovering the spongy platinum, complexing by adding sodium nitrite into the filter liquor after platinum deposition, depositing rhodium by using ammonium chloride, adding hydrochloric acid for dissolving and sodium type conversion, eliminating base metal in the liquid by using ion exchange resin, finally using hydrazine hydrate and hydrogen gas flame for recovering rhodium powder. The method is a precious-metal-resource secondary recovery utilization and purification method, and has advantages of simple technique, short purification period, convenient operations, high coefficient of recovery, little discharging of waste gas and waste matter, and environment protection, and the like.

The invention relates to a method for removing chloro-olefin in water through strengthening activating calcium peroxide, for removing the chloro-olefin contaminant existed in the underground water by using the oxidation of the calcium peroxide (CaO2), and belongs to the technical field of environmental management. In the treating process, in the existence of the calcium peroxide, the ferric ion is added for activating the oxidizing agent, the citric acid is added for reinforcing the activation effect and then the chloro-olefin contaminant is oxidized. The method has the advantages that the calcium peroxide is used as a novel green oxidizing agent and has the characteristics of strong oxidizing ability, high stability and long oxidizing effect; by adopting the ferric ion and the citric acid, the calcium peroxide can be continuously and effectively activated and the timeliness of the oxidation can be increased; the pollution of the underground water caused by the chloro-olefin can be effectively green repaired and treated without intermediate product accumulation or secondary pollution.

The invention discloses a white zirconia ceramic material composition. The composition includes: by weight, aluminium oxide 0.01-35%, magnesium oxide 0-20%, calcium oxide 0-20%, strontium oxide 0-20%, barium oxide 0-20%, yttrium oxide 1.5-8%, and balance zirconium oxide containing hafnium oxide. The white zirconia ceramic material composition has small powder granularity and uniform dispersion, and the white zirconia ceramic containing the composition has high whiteness and light-proofness, and low transmissivity. Moreover, the invention also discloses white zirconia ceramic prepared from the white zirconia ceramic material composition and a preparation method of the white zirconia ceramic.

A refractory with high high-temp and heat shock resistance and high solidifying speed is prepared from barium aluminate cement, aluminium oxide powder, silicon oxide powder and mullite powder.

The present invention discloses a nanometer barium titanate powder preparation method based on ball milling. According to the method, barium oxide, titanium oxide, zirconium oxide grinding ball, and deionized water are added to a ball mill to carry out a chemical reaction under a ball milling condition, and the mixture obtained from the reaction is sequentially subjected to filtration separation, drying, and grinding crushing to obtain the tetragonal phase nanometer barium titanate powder. According to the present invention, the tetragonal phase nanometer barium titanate powder prepared through the method has characteristics of high purity, small particle size, uniform particle, and good dispersion, wherein the average particle size of the powder is within 60-80 nm; and the preparation process does not require the addition of any other chemical solvents, has advantages of no requirement of calcining, simple process, inexpensive equipment, easy operation, low energy consumption, and the like, and provides good industrial prospects in the field of electronic ceramic material preparation.

The invention relates to a lead and cadmium free glass glaze, which is characterized in that the glass glaze consists of the following raw materials: zinc oxide, barium oxide, silicon dioxide, titanium dioxide, potassium nitrate, lithium carbonate, stannic oxide, boric acid, alumina, and zirconium dioxide. The preparation method includes: all the raw materials are put in a mixer to stir, then the uniformly stirred powder is added to a converter to be heated and melt until the powder is completely fused; the fused melt is poured into a normal-temperature pool to be cooled and condensed to half-boiled crystals; then the crystals are put into a ball mill to be milled; the milled half-boiled glass powder is poured into a dryer to be dried and then obtains glass glaze after breaking and filtering. The glass glaze is lead and cadmium free and beneficial to environment protection.

Thermal insulation comprises sol-gel formed fibres comprising 10 to 99mol% of a refractory base composition, and 1 to 90mol% of a component selected from alkaline earth metal oxides, alkali metal oxides, and mixtures thereof, and wherein said alkaline earth metal oxides if present comprise one or more of calcium oxide, strontium oxide, barium oxide or a mixture thereof. The refractory base comprises SiO2 and A12O3.

The invention belongs to the technical field of organic polluted soil remediation and discloses a method for remediating phthalic acid esters (PAEs) polluted soil by using microwave enhanced calcium peroxide. The method comprises the steps of preparing a slurry soil mixed solution from the PAEs polluted soil according to a certain liquid-solid ratio; adding a certain quantity of citric acid, ferrous sulfate and calcium peroxide into the solution; and carrying out microwave treatment and standing to enable the degradation rate of PAEs in the soil to reach more than 80%. The method has the advantages of simple process condition, low operation requirement, high treatment efficiency, low oxidizing agent waste and the like and is suitable for remediating the PAEs polluted soil.

The invention discloses a natural wood porous carbon material and a preparation method thereof. The porous carbon material is prepared by: heating natural wood cut into pieces in air for the purpose of pretreatment, soaking in a strong base solution, drying, and performing high temperature pyrolysis under protective gas; a strong base herein is one of sodium hydroxide, potassium hydroxide, lithiumhydroxide, calcium hydroxide and barium hydroxide. The porous carbon material has large specific surface area, good uniformity of pore distribution and good conductivity, as well as improved chemicalreaction activity; the porous carbon material prepared herein is widely applicable and is suitable for use in energy storage, adsorption, water treatment and other aspects. The porous carbon materialis prepared by means of physical soaking; the preparation method is simple and feasible; the porous carbon material is green; the materials are widely resourceful and low in cost.

The invention discloses a method for measuring an element content in a ferrocolumbium alloy by X-fluorescence. The method comprises the following steps of: (1) hanging on a wall; (2) oxidizing; (3) smelting; (4) measuring fluorescence intensity and drawing a calibration curve; and (5) preparing a glass sample sheet to be sampled, measuring the spectral line intensity of columbium, thallium, silicon and phosphorus in the glass sample sheet to be sampled, and determining the percentage content of the columbium, thallium, silicon and phosphorus in a ferroniobium sample to be tested according to the calibration curve of the step (4). The ferroniobium glass sheet is successfully prepared by hanging lithium tetraborate on the wall and selecting barium peroxide as an oxidant for high-temperature fusion under the condition of no corrosion damage to a platinum crucible and provides a proper sample for measuring by using an X-fluorescence method. After an oxidization process of raising temperature gradually is adopted in particular, a very good oxidization effect can be achieved. The method can effectively improve the analysis speed of the element content in ferroniobium and the accuracy of analysis data and has the characteristics of simple operation and practicability.

The invention discloses a liquid barium/zinc thermal stabilizer. The liquid barium/zinc thermal stabilizer is prepared from the following raw materials in parts by weight: 20-30 parts of barium oxide and/or hydroxide of barium, 15-20 parts of zinc oxide and/or zinc hydroxide, 30-40 parts of acid liquor, 1-2 parts of water carrying agent, 5-20 parts of saturated cyclane solvent and 5-15 parts of heat-resistant assistant, wherein the hydroxide of barium is at least one of anhydrous barium hydroxide, barium monohydrate and barium octahydrate. The invention also discloses a preparation method for the liquid barium/zinc thermal stabilizer and equipment for implementing the method. The liquid barium/zinc thermal stabilizer product disclosed by the invention is stable in property, is free of irritant odors and cannot harm bodies of operating workers; and the preparation method for the liquid barium/zinc thermal stabilizer disclosed by the invention adopts a one-step method, so that the production process is simplified, unsafe factors in a production process are reduced, and the production efficiency and yield rate are increased.

An ignition medicine with chlorate oxygen column and its production are disclosed. The ignition medicine consists of sodium chlorate 30~50% with grain size 60~300 meshes, lithium hyperchlorate or sodium perchlorate 10~30% with grain size 60~300 meshes, barium dioxide 0.1~6% with grain size 80~200 meshes, metal oxide ironic oxide or cuprous oxide 5~9% with grain size 20~200 meshes, metal powders 15~25% with grain size 100~300 meshes and cobalt salt 5~15% with grain size 40~200 meshes. It has shorter gas-take time and higher starting success probability of engine.

The invention provides a fire coal desulfurization and denitrification decoking additive and a preparation process thereof. The fire coal desulfurization and denitrification decoking additive comprises a coal dust additive, which is added to the fire coal, and a catalytic activator, which is added to a slurry tank of a desulfurization system; and the preparation process comprises the following steps of: first, adding sodium carbonate, magnesium oxide, silicon dioxide, zinc oxide, manganese dioxide, copper oxide and barium oxide in sequence and stirring the mixture for 20 minutes; and then adding active calcium oxide and ammonium bicarbonate, and stirring the mixture for 10 minutes; uniformly mixing the mixture to obtain the coal dust additive; first stirring the active calcium oxide, active aluminum oxide and caustic calcined magnesite for 15 minutes; and then adding active carbon and calcium ammonium nitrate, and uniformly stirring the mixture to obtain the catalytic activator. According to the invention, without changing the traditional boiler and desulfurization equipment as well as the process thereof, the user selects corresponding additive and catalytic activator provided by the invention according to physical and chemical indexes of the coal so as to produce coal-saving, desulfurization, denitrification and decoking effects. During using high sulfur coals, the desulfurization efficiency is obviously increased and the SO2 emission reduction reaches the standard.

The invention discloses calcium peroxide oxygenating agent particles. The calcium peroxide oxygenating agent particles comprise the following components in percentage by mass: 60-77 percent of calcium peroxide mixture, 15-25 percent of bentonite, 5-8 percent of polyvinylpolypyrrolidone, 2-5 percent of dry starch and 1-2 percent of benzalkonium bromide, wherein the calcium peroxide mixture contains calcium peroxide and calcium hydroxide, and the percentage composition of calcium peroxide is 65-75 percent. A manufacturing method comprises the following steps: uniformly mixing the calcium peroxide mixture powder, bentonite, polyvinylpolypyrrolidone and the dry starch to obtain an oxygenating agent mixture; adding water and benzalkonium bromide into the oxygenating agent mixture to obtain an oxygenating agent mixed wet material; granulating and polishing the oxygenating agent mixed wet material to obtain the calcium peroxide oxygenating agent particles. The calcium peroxide oxygenating agent particles can quickly sink to the bottom of a pool and can be quickly disintegrated to form calcium peroxide suspension, and then oxygen is gradually released and is absorbed by the water. The manufacturing method has the characteristics of simple process, low production cost and the like.

The invention discloses a sustained-release oxidizing agent taking calcium peroxide as the matrix and ethyl cellulose as the coating and a preparation method thereof. The oxidizing agent is prepared from calcium peroxide (60%), a binding agent, attapulgite, and ethyl cellulose according to a certain ratio. The preparation method comprises the following steps: step A, evenly mixing calcium peroxide (60%), a binding agent, and attapulgite, and granulating the mixture to obtain particles with a size of 3 to 5 mm; step B, according to the weight of particles obtained in the step A, supplying enough ethyl cellulose, coating particles by ethyl cellulose, and drying to obtain the sustained-release oxidizing agent. The formula is reasonable, the method is feasible, and the operation is simple. The problem that calcium peroxide releases oxygen in gleying paddy fields in a short period is solved, the growth environment for paddy rice in gleying paddy fields is improved; after calcium peroxide is coated by ethyl cellulose, the oxygen release time is prolonged to 100 days or more, and, compared with that of calcium peroxide powder, the oxygen release time is prolonged by 58 days or more, in other words 1.4 times or more. The oxidizing agent has a great popularization and application value in the middle and lower reaches, which have many glyeing paddy fields, of Changjiang River.

The invention relates to a production method for high-purity electronic-grade barium carbonate. The production method comprises the following steps: adding barium hydroxide into deionized water, heating the barium hydroxide in the stirring process and preparing into a barium hydroxide solution; adding polyacrylamide into the barium hydroxide solution and introducing carbon dioxide into the barium hydroxide solution by using a disc type microporous aerator; heating the barium hydroxide solution until the barium hydroxide solution is boiled; cooling and filtering the precipitate to obtain the barium carbonate precipitate; and drying the barium carbonate precipitate in a microwave dryer to obtain the high-purity electronic-grade barium carbonate. The polyacrylamide serves as a dispersing agent and has a good dispersing effect, so the production cost is reduced. The carbon dioxide is introduced by the disc type microporous aerator and is mixed with the barium hydroxide completely and uniformly, so the specific area of the produced barium carbonate is large, the production time is shortened, and the production efficiency is improved.

The invention discloses a new application of calcium peroxide and a fire coal combustion-supporting solid sulfide additive. The calcium peroxide is taken as a fire coal combustion-supporting catalyzer which is added to the fire coals to be subject to even physical mixing together with the fire coals, thereby being used for improving combustion performance and combustion efficiency of the fire coals. The fire coal combustion-supporting solid sulfide additive is composed of the calcium peroxide and sulfur fixing agent, wherein the calcium peroxide accounts for 4.8%-9.1% and the sulphur fixing agent accounts for 90.9%-95.2%. In the invention, application fields and utilization occasions of the calcium peroxide are broadened and the calcium peroxide and the obtained combustion-supporting solid sulfide additive are added with a small additive amount, thus being capable of reducing addition cost. The invention can be applied to various coals and equipment, is in no need of special equipment and has wide applicable range. The physical mixing is adopted for the addition, thereby having simple technology and generating no secondary pollution. The calcium peroxide is used flexibly, not only being capable of being used independently, but also assisting other sulphur fixing agents to improve solid sulfur effect.