134results about How to "Reduce the amount of impurities" patented technology

This invention involves the inner lining of a molten-steel handling furnace and its maintenance and repair. This invention is aimed to putting forward an inner lining that can satisfy the working conditions of ladle casting materials. In this invention the inner lining of the molten-steel handling furnace is cast from fire-resisting casting materials such as the high-purity corundum-magnesium oxide-spinel system. The raw material system comprises fused spinel, fused magnesite, fused white corundum, fused brown corundum, plate corundum, extra-grade alumina, alumina sponel or a combination of them. The repair of the inner lining comprises the steps of: a. cleaning the damaged inner lining to remove the molten slag layer; b. using a casting material whose purity is the same with that of the previous material to repair the damaged positions, so that the previously designed structure of the inner lining is recovered; c. natural drying of the repaired inner lining for 24-72h; d. baking. The surface activity of the microscale or finer additives can strengthen the agglomeration of the casting materials, thus making the agglomerated inner lining more compact and the repaired layer thinner.

The semiconductor memory device which can suppress that the characteristics variation of a transistor increases in connection with microfabrication is offered. In the memory cell of the present invention, channel width of an access transistor is made larger than the channel width of a driver transistor about the relation of the channel width of an access transistor and a driver transistor. That is, since the access transistor can make channel area increase from the driver transistor designed with the minimum designed size, it becomes possible to suppress the increase in the characteristics variation of an access transistor.

The invention relates to the beneficiation of mineral deposits and can be used for beneficiating wollastonite ores. The method for the dry beneficiation of a wollastonite ore involves the primary and secondary crushing of the ore, the material drying between said crushing stages, the X-ray fluorescent separation of the crushed material after the secondary crushing stage, the classification of the material according to grain-size categories immediately after the X-ray fluorescent separation by sequentially carrying out impact grinding, magnetic separation on a belt conveyor, and air sizing. Then, the method involves the magnetic separation on a roll-type separator for removing impurities from the different size wollastonite concentrate and the extraction of material flour particles at the primary and secondary crushing stages and during the impact grinding of the ore. All the extracted flour particles are delivered to one of the rolls of the roll-type separator, the wollastonite concentrate of one or more grain-sizes is dried and, then, the dried concentrate is exposed to electrostatic separation for removing impurities therefrom. Subsequently, the air sizing of the product received after electrostatic separation is carried out in order to divide said product into fractions having different grain-size. One or more product fractions are additionally crushed and electrostatic charge is removed. The proposed invention makes it possible to improve the product quality and to reduce wollastonite waste.

The invention discloses a method for producing ammonium polyphosphate by using a stepwise reaction and polymerization, relates to a method for producing ammonium polyphosphateproducts with different polymerization degrees in the same set of device, in particular to a production method of ammonium polyphosphate with high purity, high polymerization degree and the average polymerization degree larger than 1000. The method comprises the following steps in sequence: a. adding a polycondensation agent into polyphosphoric acid as a raw material in the weight ratio of 1:1 and mixing evenly; b. adding the material obtained by the step a into a continuous synthetic reactor for reacting; and c. further polymerizing products obtained in the step b for 30-300 minutes at the pressure of 0.00MPa-0.6MPa and the temperature of 120DEG C-500DEG C to obtain the high-purity ammonium polyphosphate products with the polymerization degree of 10-1,800. The invention has the advantages of convenient production and control, high yield, low energy consumption and benefit for large-scale continuous industrial production.

The invention belongs to the technical field of comprehensive utilization of waste resources, and particularly relates to an ultrafine NdFeB powder recovery method. The method comprises the following steps: conducting anti-oxidation protection on the ultrafine NdFeB powder, and then transferring the ultrafine NdFeB powder subjected to the anti-oxidation protection to a high-temperature-resistant sintering box; carrying out stage-type heating sintering treatment to achieve 1000-1100 DEG C, and carrying out heat preservation for 1-2 h; and carrying out vacuum self-cooling to achieve material temperature of 880-920 DEG C, and then carrying out inflation air-cooling to reduce the material temperature to 50 DEG C or below, thereby obtaining an ultrafine NdFeB powder alloy. The method provided by the invention is low in cost, simple in technological process, easy to operate and high in recovery rate; microelements are effectively utilized and the resource waste problem is effectively solved; and the ultrafine NdFeB powder alloy recovered according to the method is low in impurity level and reasonable in composition.

The invention provides a method for gathering platinum and palladium in a solution, and relates to separation and recycling of rare and precious metals in wet metallurgy. The method comprises the following steps of taking a solution containing platinum and palladium as a stock solution; carrying out selective reduction by controlling electric potential; and converting the platinum and the palladium in the solution into simple substances and precipitating to obtain concentrate which is rich in platinum and palladium. The method is characterized in that a substance which does not contain heavy metal elements is used as a reducing agent, electric potential of reaction liquid is controlled, the platinum and the palladium in the solution are selectively reduced and precipitated to be below 1 mg/L, and therefore, the platinum and palladium gathering effect is achieved. Compared with a traditional reactive metal substitution method, the method is low in cost and easy to operate, and has good adaptability on stock solutions with different components, and the obtained concentrate containing the platinum and the palladium has little slag, and is high in platinum and palladium gathering degree.

A preparing method of rutile vanadium dioxide nanometer particles is disclosed. The method includes 1) preheating purified water or deionized water until the water is boiling, adding a vanadium compound, stirring to obtain a vanadium compound suspension A, cooling to room temperature, adding ammonia water, sealing a container, and stirring for 0.5-3 h until a transparent solution B is prepared, 2) adding a hydrazine compound into the transparent solution B, stirring to obtain black suspension C, transferring the suspension C to a hydrothermal reactor, heating and reacting to obtain a black brown suspension D, 3) transferring the black brown suspension D into a transparent container, adding ethanol, allowing the mixture to stand so that the mixture is layered naturally after the solution is stationary, removing the supernatant liquid, adding ethanol again, stirring, allowing the mixture to stand, naturally layering, and removing the supernatant liquid again to obtain wet powder E, and 4) drying and oxidizing the wet powder E in a drying oven, firing in an atmosphere furnace containing a protective atmosphere, and treating to obtain the rutile vanadium dioxide nanometer particles. Raw materials of the method are cheap. The method greatly reduces emission of 'three wastes' or secondary environment pollution.

The invention discloses a preparation method of an aging-enhanced copper-chromium alloy. The preparation method comprises the following steps that 1, vacuum induction melting is carried out by adopting nitrogen as a protective gas; 2, powder is prepared through atomization by using a ring hole limiting type atomizer; 3, screening is carried out on the atomized alloy powder according to different particle sizes; and 4, hot pressed sintering and aging treatment are carried out in the alloy powder with a certain particle size to obtain the copper-chromium alloy. According to the preparation method of the copper-chromium alloy, the solid solubility of chromium in copper is improved; compared with an alloy prepared through a mechanical ball milling method, the alloy is better in component uniformity; the copper-chromium alloy prepared through gas atomization has fine grain structures and relatively high degree of supersaturation of chromium, and the obtained alloy sample has high conductivity and strength; and phases precipitated from the alloy powder obtained after sintering are small in size and large in number, and the alloy powder can be used for materials of high-energy electric conduction elastic devices and electrical contacts in the aerospace field.

The invention provides a method for preparing extracts rich in vitexin rhamnoside and vitexin glucoside, and relates to the field of herbal extracting. The method comprises the following steps: a water solution of Chinese hawthorn crude extract is used for being passed through macroporous adsorption resin columns or polyamide columns, and water, solvents, solvents A containing sodium bicarbonate or potassium bicarbonate are used to elute target composition, and eluting liquid is collected. The potential of hydrogen (pH) is adjusted to be between 6 and 7.5, organic solvents are removed, eluting liquid free of the organic solvents is obtained, normal butanol or isobutyl alcohol is used for extracting the target composition, and the solvents are recovered to dry. Or the water solution of the Chinese hawthorn crude extract is used for being passed through the macroporous adsorption resin columns or the polyamide columns, salt is eluted by the water, and then solvents B are used to elute the target composition, the eluting liquid is recovered, and the extracts rich in the vitexin rhamnoside and the vitexin glucoside are obtained after the eluting liquid is dried. According to the method, the vitexin rhamnoside is 30%-55% of the extracts, and the vitexin glucoside is 10%-35% of the extracts.

The invention discloses a xanthophyll soft capsule. The soft capsule consists of two parts of liquid medicine and a capsule shell. The soft capsule is characterized in that the liquid medicine consists of 5-30mg of xanthophyll, 10-40mg of Chinese wolfberry extracts, 1-10mg of vitamin E and 100-400mg of linseed oil, wherein the liquid medicine of each soft capsule contains 5-40mg of xanthophyll and Chinese wolfberry extracts in parts by weight. According to the invention, high-purity xanthophyll crystal powder is used as a raw material to be made into the soft capsule, the absorption is better, the action is more prominent, and the effect is more significant. Research results show that whether the soft capsule is placed at a room temperature or the soft capsule is in a high-temperature high-moisture accelerated test, the phenomena that the outer shells of the capsule are deformed and cracked and contents overflow are avoided; besides, effective components are all stable when the soft capsule is in a disintegration test, qualitative identification and content measurement, which indicates that the stability of the xanthophyll composite soft capsule preparation disclosed by the invention is good.

The invention relates to the field of metallurgy and particularly relates to an iron ore cooled agglomerated pellet binder comprising calcium oxide, silicon dioxide, pottery clay and water glass. The binder disclosed by the invention is economic and practical and has high commercial values; and the binder is applied to the field of metallurgy and has the benefits that raw materials are saved and enterprise benefit is increased.

The present invention relates to a single-crystalline aluminum nitride wherein a carbon concentration is 1×10¹⁴ atoms/cm³ or more and less than 3×10¹⁷ atoms/cm³, a chlorine concentration is 1×10¹⁴ to 1×10¹⁷ atoms/cm³, and an absorption coefficient at 265 nm wavelength is 40 cm⁻¹ or less.

The invention discloses a method and a device for purifying bromine-extracting waste liquid. Waste salt sludge generated in the process of refining saline through a chemical process is selected and used for adjusting pH value of the bromine-extracting waste liquid, and turbidity of the bromine-extracting waste liquid is lowered through secondary coagulation process and air flotation process; the method and the device can be used for purifying high-acidity high-salinity bromine-extracting waste liquid, acid corrosiveness of the waste liquid is lowered remarkably, up-to-standard emission is realized, and no acidic pollution is caused to surrounding environment; various suspended matters can be removed effectively, the bromine-extracting waste liquid after being purified is quite clear, the turbidity is lowered remarkably, and 90% of ingredients like silicon and iron in the bromine-extracting waste liquid can be removed without changing original active composition in the same; through purifying treatment, quality of the bromine-extracting waste liquid is improved greatly, the method and the device can be directly used for salt drying in the sun, vacuum salt making and other process using saline, are low in purifying cost and simple in raw material obtaining way, realize treatment of waste by waste and have remarkable environment protection benefit.

The invention discloses ziprasidone hydrochloride solid dispersible tablets and a hot melt extrusion method thereof. Based on ziprasidone hydrochloride as a main component, one or two of mixed carriers of copolyvidone S630 or HPMCAS-HF (hydroxypropyl methylcellulose acetate succinate) as a base, a coating material is added, and the glass transition temperature of an extruded mixture can also be reduced; then, a surfactant is added. The ziprasidone hydrochloride solid dispersible tablets are prepared through steps as follows: the raw and auxiliary materials are evenly mixed by a three-dimensional mixing machine, extruded by a hot melt extruder at a high temperature and ground into powder with proper size; the powder is then mixed with a fixed quantity of filler, disintegrant and lubricant sufficiently and uniformly, and direct tableting is preformed, and the ziprasidone hydrochloride solid dispersible tablets are prepared. The prepared ziprasidone hydrochloride solid dispersible tabletshave the advantages that the problem of poor in-vitro dissolution of ziprasidone hydrochloride is solved, bioavailability of ziprasidone hydrochloride under the condition of empty stomach is improved, and the treatment effect of the tablets is improved finally.

The invention relates to the field of food processing, in particular to a processing technology of a leisure beef food with primary taste. The processing technology comprises the steps of selecting materials, dicing, cooking with clean water, dehydration, cutting into slices, subpackaging, sterilization and the like. The invention aims to provide the processing technology of the leisure beef food with primary taste. Under the condition that no artificially synthesized seasoning (essence ) or preservative is added, the leisure beef food which has the primary taste of beef, has a certain shelf life and is safe is produced.

The invention relates to a purification method of phosphoric acid, which belongs to the technical field of phosphorous chemical industry. The technical problem to be solved by the invention is to improve the purity of the phosphoric acid, effectively remove impurities of anions and cations and obtain high-purity acid for preparing industrial-grade or food-grade phosphoric acid. The technical scheme of the invention is as follows: the purification method of the phosphoric acid adopts the three-chamber electrodialysis method and comprises the following steps: adding phosphoric acid solution to be purified in an anode chamber, adding acid solution in a cathode chamber, and adding ultrapure water or diluted phosphoric acid in an intermediate chamber; and carrying out electrodialysis under the action of a direct current electric field, leading phosphate radicals in the anode chamber to pass through an anion exchange membrane and enter into the intermediate chamber, leading hydrogen ions in the cathode chamber to pass through a cation exchange membrane and enter into the intermediate chamber, and finally obtaining the purified phosphoric acid in the intermediate chamber. The method can separate the phosphoric acid from impurities through the action of the attraction force of the electric field, the concentration difference diffusion and the selective permeability of the anions and the cations and obtain the purified phosphoric acid in the intermediate chamber, the process is simple, and the obtained product has good quality, thereby providing the new process for purifying the phosphoric acid.

The invention discloses a treatment method of carbonate-containing wastewater. The carbonate-containing wastewater passes through a regulating reservoir, a multi-medium filter, an ultrafiltration system, a reverse osmosis system, a primary resin softening system, a concentrated water reverse osmosis system, an advanced oxidation system, a tubular microfiltration system, a secondary resin softening system, a high-pressure reverse osmosis system, a sludge filter pressing system, an evaporation freezing crystallization system, an evaporation crystallization system, a wastewater treatment system, a recycling water tank and the like for process treatment to obtain sodium carbonate decahydrate product salt and by-products sodium sulfate and sodium chloride product salt. The treatment method has the advantages of strong anti-pollution capability, high concentration multiple, high recovery rate, high crystallized salt quality, high automation degree, low investment and low operation cost.

The disclosed detection method for Chlorphenamine Maleate content in preparation comprises: with HPLC, using mixed solvent with alcohol and weak-polar organic solution as extraction solution, octadecylsilicane chemically bonded silica as filler, and the mobile phase with brine, aminoethane and acetonitrile. This invention is simple and has well detection effect.

The invention relates to a resveratrol and spirulina composition and preparations and a preparation method thereof. The composition comprises spirulina and high-purity resveratrol with the purity higher than 80%; the composition further comprises an astragalus root extract, a tartary buckwheat extract and vitamin C; and a solid preparation is prepared from the composition and adjuvants, wherein the adjuvants comprise hydroxymethyl cellulose, microcrystalline cellulose and beta-cyclodextrin, and the beta-cyclodextrin can be used for improving the solubility and stability of the composition and improving the bioavailability of the solid preparation. The solid preparation disclosed by the invention can be used for promoting the recovery of islet cells, improving glucose tolerance, lowering blood viscosity and the brittleness of capillaries, promoting blood circulation, lowering blood sugar and blood fat and protecting the liver, and has a very good treatment effect on the prevention or treatment of diabetes, complications of diabetes and cardio-cerebral vascular diseases.

The invention discloses a reducing method for lead dioxide in waste lead plaster, and belongs to the recycling field of the lead dioxide in a waste lead storage battery. The waste lead plaster contains about 30% of PbO2, and during recycling, the PbO2 is required to be converted into bivalent lead (lead oxide or lead sulfate) for being recycled. According to the reducing method, sodium hydrogen sulfite is adopted as a reducing agent for PbO2 in the lead plaster, and sulfuric acid is used as an assistant for converting the PbO2 into lead surface and converting the sodium hydrogen sulfite into sodium sulfate. The sodium sulfate is regenerated into the sodium hydrogen sulfite by use of calcium hydrogen sulfite for being recycled for reducing reaction of PbO2 in the lead plaster, and an obtained byproduct calcium sulfate can be further comprehensively utilized. The calcium hydrogen sulfite for regenerating can be prepared from calcium hydroxide or sulfur dioxide in calcium carbonate absorbing smoke gas. The method has the advantages of being high in lead conversion rate and low in cost.