188results about How to "Reduce sintering" patented technology

Systems and processes for producing synthesis gas. A carbonaceous feedstock can be combined with one or more low-oxygen carrier fluids having a high heating value. The feedstock and carrier fluid, in the presence of one or more oxidants, can be gasified to provide a synthesis gas. In one or more embodiments, at least a portion of the synthesis gas can be recycled for use as the carrier fluid.

A number of unique processes are disclosed for manufacture of sintered high-purity quartz glass products in which a shaped silica body or preform is made from an aqueous slurry of micronized silica particles by gel casting, slip casting or electrophoretic deposition. The silica particles may comprise a major portion by weight of crystalline silica. In one embodiment of the invention the sintered quartz glass is transparent, substantially bubble-free and suitable for scientific or optical uses. In another embodiment the porous silica preform is fired in steam to increase the hydroxyl content and then nitrided in a nitrogen-hydrogen reducing atmosphere. A minute amount of chemically-combined nitrogen in the high-purity quartz glass is sufficient to provide a tremendous improvement in physical properties and an incredible increase in the resistance to devitrification.

The invention provides an efficient separation method for low-grade and complex iron ores. The method is characterized in that the complex iron ores of different grades and species are classified, so as to obtain lump ores and mineral powder which are balled, dried and preheated; reduction roasting, cooling, ball milling, magnetic separation, ball milling and magnetic separation or reverse flotation are performed in turn, so as to obtain iron ore concentrate or reduced iron powder; classification treatment is to crush and screen the iron ores with iron-containing grade between 50 and 56 percent and then dry and preheat obtained ores; fine-grained mineral powder is ground, washed, ground, deslimed and separated so as to obtain the iron ore concentrate and slime containing 58 to 60 percent of iron; the slime which is washed, deslimed, and separated is dewatered and dried and is added to and well mixed additives, so as to be balled then; the iron ores with the iron-containing grade between 40 and 50 percent are crushed and screened so as to obtain the lump ores which are directly dried and preheated, while the fine-grained mineral powder is obtained through dry-type grinding and then is added to and well mixed the additives so as to be balled then; and the iron ores with the iron-containing grade between 25 and 40 percent are crushed and screened so as to obtain the lump ores which are dried and preheated, while the fine-grained mineral powder is subjected to grinding, gravity separation or high-gradient magnetic separation and reverse flotation, so as to obtain coarse iron concentrate powder which is added to and well mixed with the additives and then is balled.

The invention relates to a method for preparing a high-nickel long-cycle single-crystal nickel-cobalt-manganese (NCM) lithium ion battery positive-pole material. The preparation method comprises the following steps: (1) mixing a soluble nickel salt, a cobalt salt, a manganese salt, an alkali metal hydroxide and ammonia water, and enabling the mixture to flow into a reaction kettle for constant-temperature coprecipitation to obtain a high-nickel NCM ternary precursor material; (2) uniformly mixing the high-nickel NCM ternary precursor, lithium hydroxide and an additive A in a wet high-speed mixing mode, carrying out drying, then carrying out primary sintering in an oxygen-enriched atmosphere to obtain a spherical high-nickel NCM ternary positive-pole material; (3) carrying out crushing, smashing and sieving to obtain a high-nickel NCM ternary positive-pole material; and (4) carrying out wet mixing and drying on the high-nickel NCM ternary positive-pole material with a coating agent B, carrying out secondary sintering in an oxygen-enriched atmosphere, and carrying out crushing, smashing and sieving to obtain the high-nickel single-crystal NCM lithium ion battery positive-pole material. The positive-pole material prepared by the method has the advantages of high capacity, good cycle performance, high compaction density and the like.

A process of manufacturing a membrane electrode assembly comprises the steps of preparing an electrode-forming catalyst ink comprising porous aerogel supported catalyst and an electrolyte; depositing the prepared catalyst ink on a polymer film to form one or more catalyst layers; hot-pressing the one or more catalyst layers deposited on the polymer film at a temperature that is higher than a glass transition temperature of the electrolyte; decreasing the temperature of the hot-pressed catalyst layer and the polymer film; and removing the polymer film from the one or more catalyst layers.

A wide-temperature, high-frequency and low-loss manganese-zinc soft magnetic ferrite material comprises a main component, an auxiliary component A and an auxiliary component B, wherein, according to weight percentage, the main component comprises Fe2O3, MnO and ZnO; based on the weight of the main component, the auxiliary component A comprises at least two of CaCO3, V2O5, TiO2 and Co3O4, and the auxiliary component B comprises at least three of CaCO3, Nb2O5, TiO2, Co3O4, CuO, MoO and SiO2; the SiO2 amount in the auxiliary component B is determined according to the total amount of SiO2 impurities in the main component so as to ensure that in the whole material, the SiO2 amount is 0.025-0.035% of the total weight of the main component. A preparation method of the wide-temperature, high-frequency and low-loss manganese-zinc soft magnetic ferrite material sequentially comprises the following steps: performing component analysis on the main component, primarily dosing, primarily sanding, presintering, secondarily dosing, moulding and sintering. The wide-temperature, high-frequency and low-loss manganese-zinc soft magnetic ferrite material has excellent working performance under the conditions of 500KHz and 50mT and within the temperature range from -20 DEG C to 120 DEG C, has relatively low loss, saves more energy than the conventional material, and has lower standby loss at low temperature and room temperature.

The invention discloses high-strength aluminum oxide ceramic metalized paste and a preparation method thereof. The metalized paste disclosed by the invention is prepared from the following substances by weight percent: 70-85% of molybdenum powder, 5-15% of manganese powder, 5-15% of Al2O3 powder; 5-10% of silica powder, 0.2-1.2% of calcium oxide, 0.2-1.5% of magnesium oxide, 0.2-1.5% of zirconium oxide powder, and 0.2-1.0% of titanium dioxide powder. The preparation method comprises the steps of respectively putting the substances into an oven according to the ratio; baking for 1-2 hours at the temperature of 100-110 DEG C; putting the molybdenum powder into a ball grinder; adding absolute ethyl alcohol to grind for 24-48 hours; baking at 100-110 DEG C; and putting the manganese powder, the Al2O3 powder, the silica powder, the calcium oxide, the magnesium oxide, the zirconium oxide powder and the titanium dioxide powder into the ball grinder to grind for 4-6 hours; adding the grinded molybdenum powder to grind for 36-48 hours, so as to obtain the mixed powder of the materials; and adding a binder to the mixed powder to grind for 24-48 hours, so as to obtain the metalized paste.

The invention discloses BCTZ-based perovskite system multi-component lead-free piezoelectric ceramic and a preparation method thereof. Raw material components in molar percent are represented by (1-y)[(1-x)Ba(Zr0.2Ti0.8)O3-x(Ca0.7Ca0.3)O3]-y[(Na0.52K0.44Li0.04)(Nb0.88-Sb0.08Ta0.04)O3], wherein x is 0.40 to 0.50; and y is 0.001 to 0.05. A principal crystalline phase of the material has a perovskite structure, the piezoelectric constant d33 is up to 464pC/N, the electromechanical coupling factor kp is up to 0.5, the performance of the traditional lead-containing piezoelectric ceramic is reached, and the preparation process is stable and repeatable; and the existence of Na, K and Li ions can reduce sintering and calcining temperature, and the piezoelectric ceramic has a good application prospect.

A coating system for Si-containing materials, particularly Si-based composites used to produce articles exposed to high temperatures. The coating system is a compositionally-graded thermal/environmental barrier coating (T/EBC) system that includes an intermediate layer containing yttria-stabilized hafnia (YSHf) and mullite, alumina and/or an aluminosilicate, which is used in combination with an inner layer between a Si-containing substrate and the intermediate layer and a thermal-insulating top coat overlying the intermediate layer. The intermediate layer provides environmental protection to the silicon-containing substrate, and has a coefficient of thermal expansion between that of the top coat and that of the inner layer so as to serve as a transition layer therebetween. The intermediate layer is particular well suited for use in combination with an inner layer of an alkaline earth metal aluminosilicate (such as BSAS) and a top coat formed of YSZ or YSHf.

The invention relates to a direct reduction method for treating industrial waste slag in a rotary hearth furnace, belonging to a new direct reduction ironmaking process in the metallurgical industry. The main process is: ingredients - mixing - pellets - drying - preheating - reduction - metallized pellets. Metallized pellets with a metallization rate of over 80% can be obtained after reduction in a rotary hearth furnace. The present invention comprehensively recycles and utilizes valuable elements in iron-containing industrial waste residues, economically obtains reducing agent resources, and solves the problem of low falling strength of cold solidified carbon-containing pellets prepared in the process of comprehensive recycling of industrial waste residues It has the advantages of high metallization rate, simple operation, easy control of process conditions, less equipment investment, low production cost, easy to meet raw material conditions, etc., and the overall process is more energy-saving than the furnace smelting process. It is also more environmentally friendly, and more importantly, the method can comprehensively recycle industrial waste, reduce its pollution to the environment, and save energy and protect the environment.

The invention relates to a functionally graded material shape (1) where a first material (M1) is fused with a second material (M2) through sintering and a method of production of said functionally graded material shape (1). Said first material (M1) has a first coefficient of thermal expansion (α1) and said second material (M2) has a second coefficient of thermal expansion (α2), differing from the first coefficient of thermal expansion (α1). The invention is characterized in that the shape (1) further comprises a third material (M3) adapted to, together with M1 and M2, create an intermediate composite material phase intermixed between the first and the second materials (M1, M2). Said third material (M3) has a coefficient of thermal expansion (α3) intermediate between the first coefficient of thermal expansion (α1) of the first material (M1) and the second coefficient of thermal expansion (α2) of the second material (M2).

The invention provides a method for producing molten iron with high-phosphorus and low-iron refractory iron ore, comprising the following steps: taking high-phosphorus and low-iron refractory iron oreas raw material; taking wood coal as reducing agent; oxidizing roasting; directly reducing; magnetically separating and separating; melting and separating; dephosphorizing molten iron; and obtainingthe low-phosphorus molten iron. The method can process the extremely refractory iron ore with high P content, high S content, high SiO2 content and low iron level, has high ore iron recovery rate, completely solves the difficulties of the high-phosphorus and low-iron refractory iron ore such as ore selecting and smelting, removing coke, and eliminating high-energy consumption and high-pollution technical process such as ore selecting, sintering, palletizing, coking, etc. Phosphorus-containing slag can realize resource comprehensive utilization. A great number of experiments and semi-industrialproduction demonstrate that the technical economic effect of the method is remarkable and effectively solves the current problem of ore resources supply-demand contradiction in China.

Ferrous (II) phosphate (Fe₃(PO₄)₂) powders, lithium iron phosphate (LiFePO₄) powders for a Li-ion battery and methods for manufacturing the same are provided. The lithium iron phosphate powders are represented by the following formula (II):

LiFe_(1-a)M_aPO₄  (II)

wherein, M, and a are defined in the specification, the lithium iron phosphate powders are composed of plural flake powders, the length of each of the flake powders is 0.1-10 μm, and a ratio of the length and the thickness of each of the flake powder is in a range from 11 to 400.

Ferrous (II) phosphate (Fe₃(PO₄)₂) powders, lithium iron phosphate (LiFePO₄) powders for a Li-ion battery and methods for manufacturing the same are provided. The lithium iron phosphate powders are represented by the following formula (II):

LiFe_(1-a)M_aPO₄   (II)

wherein, M, and a are defined in the specification, the lithium iron phosphate powders are composed of plural flake powders, the length of each of the flake powders is 0.1-10 μm, and a ratio of the length and the thickness of each of the flake powder is in a range from 11 to 400.

The invention relates to an anti-erosion iron runner castable for a large blast furnace. The material comprises, according to weight percentage, 58-64 parts of compact brown fused alumina particles, 2-5 parts of white corundum particles, 16-23 parts of silicon carbide, 5-7 parts of aluminum oxide micro-powder, 2-3 parts of pure calcium aluminate cement, 2-3 parts of silicon dioxide micro-powder, 1.5-2.5 parts of spherical asphalt particles, 0.5-1.2 parts of carbon black powder, 1.5-3.5 parts of metal silicon powder, 0.2-0.6 part of boron carbide, 0.1-0.2 part of metal aluminum powder, 0.15-0.2part of a water reducing agent, 0.6-1 part of an anti-erosion agent and 0.05-0.08 part of explosion-proof fibers. According to the castable, the service life of a primary runner of a main runner is prolonged, and the stability of safe operation of an iron runner is improved. It is verified that the requirements for rapid baking without cracking, erosion resistance, oxidation resistance, slag adhesion resistance and iron flux can be met, the iron flux can reach 180000 tons or above without repairing, and good application prospects are achieved.

The invention discloses an engine cleaning lubricant and a preparation method thereof. The engine cleaning lubricant is prepared through combining high-base-number sulfurized alkylphenol calcium, polyacrylate, polyisobutylene, polyisobutylene succinimide, organic molybdenum and cleaning oil, is used for cleaning an engine, can decompose quickly and is used for removing various colloids, stubborn scales, carbon deposits and attachments, such as metal powder and the like generated through metal friction from the interior of the engine, so that good lubricating property is guaranteed, the frictional resistance is reduced, the power of an automobile is increased, the elasticity of various sealing gaskets and cushions inside the engine is recovered, and the sealing performance is enhanced; and a layer of protective film is formed inside the engine, so that the rust preventing and wear resisting functions of the engine are improved, the oil consumption and engine wear are reduced, and the service lives of engine oil and the engine are prolonged.

The invention relates to a method for preparing low-oxygen high-pure metal hafnium powder; the low-oxygen high-pure metal hafnium powder has the purity of greater than 99.5wt% and the oxygen content being smaller than 0.15 wt%. The preparation method comprises the following steps: a. filling metal hafnium powder, a deoxidizing agent and a molten salt into a crucible; b, putting the crucible into a reaction tank, sealing the equipment, vacuumizing and inflating argon gas to wash the crucible, heating and deoxidizing, then performing constant-temperature and thermal-insulating deoxidization, cooling and discharging at the end of the deoxidization; c, pickling the discharged product, then washing with de-ionized water, sieving and drying the obtained product, namely, the product of the low-oxygen high-pure metal hafnium powder. The molten salt system is capable of effectively removing impurities in the metal hafnium powder, in particular, remarkably reducing the oxygen content in the hafnium powder; and the prepared low-oxygen high-pure metal hafnium powder satisfies the material requirement of high-end products.

The invention relates to a sintering prevention vanadium-containing stone coal microwave roasting method. According to the technical scheme, the method includes: crushing vanadium-containing stone coal into coarse-grained vanadium-containing stone coal with the grain size less than 6mm and greater than 1mm and fine-grained vanadium-containing stone coal with the grain size less than 1mm; adding water to the fine-grained vanadium-containing stone coal to be mixed according to the mass ratio of the fine-grained vanadium-containing stone coal to the water of 1:0.06-0.09 to produce small balls 3-8mm in grain size and drying the small balls; placing the dried small balls in an industrial microwave roasting device as bedding materials, placing the coarse-grained vanadium-containing stone coal on the bedding materials prior to microwave roasting, and cooling to indoor temperature to obtain vanadium-containing stone coal roasting materials, wherein the microwave roasting is characterized in that the temperature rate ranging from 25 DEG C/min to 55 DEG C/min is increased rapidly to the temperature rate ranging from 750 DEG C to 850 DEG C, 25-40 min constant-temperature microwave roasting is performed, and the industrial microwave roasting device is 2400 to 2500 MHz (megahertz) in frequency. With the method, sintering during microwave roasting of the vanadium-containing stone coal is obviously reduced, and the effect of microwave roasting is good.

Disclosed is a novel method of making a structuring agent for edible dispersions such as margarines or spreads. Fat, or another structuring component, is subjected to a process involving mixing it with liquefied gas or supercritical gas, and expanding the mixture through an orifice. In the invention, water is added to the mixture prior to expansion, so as to provide a spray liquid in the form of a fat and water emulsion.

The invention discloses a method for preparing a silver carbonized Raney copper catalyst, a catalyst and an application. The method comprises the steps: (1) uniformly mixing Raney alloy particles witha curing system of carbonizable organic matters, and carrying out curing, so as to obtain a catalyst precursor; (2) carbonizing the obtained catalyst precursor at a high temperature under the protection of inert gas, and then, carrying out activation, so as to obtain a carbonized Raney copper catalyst; (3) preparing a mixed solution from soluble organic amine and water, and then, dissolving a soluble silver salt and soluble salts of other auxiliaries, so as to prepare a silver source solution; and (4) adding the carbonized Raney copper catalyst into deionized water, carrying out stirring to form a suspension solution, dropwise adding the silver source solution obtained in the step (3) into the carbonized Raney copper catalyst solution, and carrying out a reaction and washing, thereby preparing the silver carbonized Raney copper catalyst. According to the catalyst disclosed by the invention, alkyne in liquid-phase C4 distillate can be removed until the concentration is 30ppm or less, and the loss rate of 1,3-butadiene is controlled to be 3% or less.