52results about How to "High value for industrial use" patented technology

The invention provides a hard-particle powder for sintered body, which contains, by mass %, 2% to 3.5% of Si, 6% to 10% of Cr, 20% to 35% of Mo, 0.01% to 0.5% of REM, and the remainder being Co and unavoidable impurities. The invention further provides a sintered body obtained through a mixing step of mixing the above-mentioned hard-particle powder for sintered body with a pure iron powder and a graphite powder to obtain a powder mixture, a forming step of compacting the powder mixture to obtain a compact, and a sintering step of sintering the compact. The hard-particle powder according to the invention has the effect of giving a sintered body having improved wear resistance without substantially impairing powder characteristics and sintering characteristics. Additionally, the sintered body according to the invention has the effect of having excellent wear resistance.

Disclosed is a process for the production of ketomalonic acid compounds or hydrates thereof by reacting a malonic acid compound with one or more chlorous acid compounds selected from among chlorous acid and chlorites and thus oxidizing the methylene group of the malonic acid compound. The process does not necessitate highly toxic reagents, lowly safe reagents, special reactants, special reaction equipment, expensive reagents, expensive catalysts, or transition metals such as noble metals, and permits the selection of mild reaction conditions and simple operation, thus enabling efficient and easy production of ketomalonic acid compounds such as ketomalonic diesters under simple and easy conditions suitable for industrialization.

To provide a method for reducing a wiring width in the formation of a copper wiring by the semi-additive method of a printed circuit board, etc., suppressing an undercut and further forming a uniform wiring width in a plane. The method for manufacturing the printed circuit board having the fine wiring of a line/space of 50 [mu]m/50 [mu]m or less using the semi-additive method includes a step of processing with an etchant liquid in which an etching speed of non-electrolytic copper plating of a seed layer is twice as fast as the etching speed of the electrolytic copper plating, and non-electrolytic copper plating removing time in space of the fine wiring having the line/space of 50 [mu]m/50 [mu]m or less is larger than 50 [mu]m or less is three times as fast as the non-electrolytic copper plating removing time in the space larger than 50 [mu]m, and manufacturing of the printed circuit board.

The purpose of the present invention is to provide: a production intermediate suitable for the industrial-scale production of a compound represented by general formula (4) and having a harmful-organism control activity; and a method for producing the same. A compound represented by general formula (4) (In the formula, R1-R4 are as stated below) is produced by causing a reaction between the following, while in the presence of a a compound represented by general formula (b) R4-Y (In the formula, R4 represents a C1-C4 haloalkyl group, and Y is a halogen atom or the like.); and a compound represented by general formula (3) (In the formula, R1 and R2 each independently represent a halogen atom or a C1-C4 alkyl group.), which is obtained by oxidizing a mercaptophenol derivative, and next, while in the presence of a base, causing a reaction with a compound represented by general formula (a) R3-X (In the formula, R3 represents a C1-C4 haloalkyl thio C2-C10 alkyl group, and X is a halogen atom or the like.).

The invention discloses a preparation method of a loaded metal catalyst based on metal-organic framework UIO-66. The catalyst is prepared by: adding a carrier precursor metal salt into water, adding an organic ligand into N, N-dimethylformamide, after full dissolution of the two substances, mixing the two solutions evenly, adding an active component precursor, and performing one-pot synthesis to obtain a catalyst precursor, and carrying out high temperature roasting and reduction to obtain the metal catalyst. The high stability metal catalyst M@BO2@C prepared by one-pot synthesis method, the method prepares the loaded metal catalyst based on UIO-66 structure, the preparation method is simple, provides a new synthesis method for preparation of nano-scale catalyst, and has high industrial utilization value. The catalyst prepared according to the invention is subjected to high temperature calcination and reduction, has good thermal stability and potential application space, moreover, thecatalyst still maintains the shape of UIO-66 after high temperature calcination.

The invention discloses a method for separating and recovering scandium in stable zirconia ceramic wastes containing scandium and rare earth. The method comprises the following steps: crushing ceramic wastes firstly, sieving by virtue of a 200-mesh sieve, then dissolving the crushed powder by acid; after heating and concentrating a filtrate, adding potassium chloride, carrying out crystallization to obtain potassium fluozirconate, and separating zirconium from a solution; and washing filter residues, carrying out conversion treatment by using 5-20 percent sodium hydroxide, washing the residues again after treatment, dissolving with acid, extracting scandium by using an extractant so as to realize the separation of scandium and the rare earth, neutralizing an extraction raffinate with alkali, recovering the rare earth from precipitates, and searing to obtain rare earth oxide; and carrying out washing and back extraction on an organic phase for extracting the scandium, precipitating the scandium by oxalic acid, and searing to obtain scandium oxide. According to the method disclosed by the invention, the purity of Sc2O3 is larger than 99 percent, the recovery rate is larger than 90 percent, the recovery rate of the rare earth is larger than 90 percent, and the recovery rate of Zr is larger than 95 percent.

The invention belongs to the technical field of metallurgical industry analysis and discloses a method for determining germanium content of a cobalt-nickel slag by atomic fluorescence spectrometry. The method comprises the following steps: preparing a germanium standard solution, a zinc standard solution and a thiourea-ascorbic acid mixed solution, and drawing a germanium standard solution curve; weighing a cobalt-nickel slag sample to prepare a sample solution; determining the fluorescence intensity of germanium in the sample by using an atomic fluorescence spectrometer; and comparing with the germanium standard solution curve and analyzing the content of the germanium in the sample solution. According to the method, after the approximate equal amount of zinc is added into the germanium standard solution, the germanium standard curve is drawn to eliminate the inferences to a detection result by the base body zinc. The method disclosed by the invention has the characteristics of low detection limit, wide linear range, low maintenance cost, rapidness in measurement, simplicity in operation, good accuracy, high precision, capability of simultaneously and rapidly determining elements to be detected and the like; furthermore, the method has the characteristics of few needed reagents, low cost and high automation degree, is suitable for analyzing a large batch of samples and has a very good industrial utilization value.

Combustion method and apparatus for NOx reduction are capable of easily achieving NOx reduction to an exhaust NOx value of 30 ppm or under. The combustion method is to perform in combination a first NOx reduction step for suppressing generated NOx value to 60 ppm or under (at 0% O2 in exhaust gas, dry basis) by a low NOx burner, a second NOx reduction step for recirculating exhaust gas of the low NOx burner to a burning reaction zone formed by the low NOx burner, and a third NOx reduction step for adding water or steam to the burning reaction zone.

The invention belongs to the technical field of deep corn machining, and in particular relates to a method for preparing a regenerated cellulose fiber from fine corn fibers in the corn starch milk production process. The method for preparing the regenerated cellulose fiber from the fine corn fiber in the corn starch milk production process comprises the following steps of S1. preparing fine corn fiber pulp; S2. preparing a cellulose spinning solution; and S3. preparing recycled cellulose fibers. The recycled cellulose fibers prepared by using the method provided by the invention is good in spinning mechanical property which is superior to that of ordinary viscose; and moreover due to adoption of the method, the complex preparation steps in the ordinary preparation method are avoided, the recycled cellulose fiber which can be woven can be prepared at one time, and the industrial utilization values of the fine corn fibers are improved.

The purpose of the present invention to provide a method for producing a nitrobenzene compound represented by general formula (1), which is economically preferable, and suitable for industrialization.The present invention pertains to a method for producing a nitrobenzene compound represented by general formula (1) (in the formula, R1 represents a halogen atom; R2, R3, and R4 represent a hydrogenatom or the like; R5 represents a halogen atom or an alkoxycarbonyl group), comprising: (i) a step for reacting an aniline compound represented by general formula (2) (in the formula, R1, R2, R3, R4,and R5 are as defined above) with a metal salt of nitrous acid in the presence of nitric acid; and (ii) a step for reacting the product of step (i) with a metal salt of nitrous acid in the presence ofa copper compound.

The invention discloses a composite modified montmorillonite adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a cetyltrimethyl ammonium bromide column agent from cetyl trimethyl ammonium bromide and water; preparing a dextrin column agent from dextrin, a sulfuric acid solution and water; mixing montmorillonite and water into montmorillonite suspension liquid, and adding the two column agents into the montmorillonite suspension liquid to prepare the composite modified montmorillonite adsorbent. The invention alsoprovides application of the composite modified montmorillonite adsorbent in Cr (VI)-containing wastewater treatment. In the application process of the composite modified montmorillonite adsorbent, the Cr (VI) in wastewater can be effectively removed; compared with a single modified montmorillonite adsorbent, the composite modified montmorillonite adsorbent is better in adsorption effect and higher in adsorption capacity.

The invention relates to an aluminum removal method for shale vanadium extraction pickle liquor. According to the technical scheme, the aluminum removal method comprises the steps that potassium saltis added into the shale vanadium extraction pickle liquor and mixed, and pretreatment liquid is obtained, wherein the mole ratio of Al to K in the pretreatment liquid is 1:(0.8 to 3.0); the pretreatment liquid is placed in an airtight container and stirred under the conditions of 140-280 DEG C and 100-400 r/min for 3.5-6 h, and mixed slurry is obtained; and the mixed slurry is subjected to solid-liquid separation, and aluminum removal purification liquid and alunite slag are obtained. As for the shale vanadium extraction pickle liquor, the aluminum concentration is 4-25 g/L, and the pH is -0.50-2.0. The potassium salt is one or more of potassium sulfate, potassium chloride and potassium bisulfate. The aluminum removal method has the characteristics of easy and convenient operation, environmental friendliness and short technological process, and V and Al can be effectively separated.