32results about How to "Reduce the amount of fine powder" patented technology

The invention relates to supported Ziegler-Natta catalyst components based on water-bearing silica gel (water content 0.5-8.0wt percent), which comprises the supported Ziegler-Natta catalyst and catalyst components of the supported Ziegler-Natta catalyst components, and a preparation method of the catalyst. The supported Ziegler-Natta catalyst is applied to homopolymerization of catalytic olefin and copolymerization of two or more than two different olefins. The supported Ziegler-Natta catalyst of the invention has low production cost, stable and easily controllable kinetic curve when being used in homopolymerization and copolymerization of catalytic olefin and stable active release; besides, polymers produced by the invention have low contend of fine powder and oligomer of the polymer and narrow particle size distribution of the polymer.

The invention discloses a flue gas desulfurization and denitration system. The system comprises a bag deduster, a booster fan, a waste heat boiler, an adsorption tower and a regeneration tower, the outlet of the bag deduster is communicated with the flue gas inlet of the waste heat boiler through the booster fan, the flue gas outlet of the waste heat boiler is communicated with the flue gas inletof the adsorption tower, the flue gas outlet of the adsorption tower is communicated with the chimney, a material outlet at the bottom of the adsorption tower is communicated with a material inlet atthe top of the regeneration tower, a material outlet at the bottom of the regeneration tower is communicated with a material inlet of a vibrating screen, and the oversize product outlet of the vibrating screen is communicated with a material inlet at the top of the adsorption tower. The system has the advantages of high long-term running stability, high safety, high desulfurization and denitrationefficiency, and realization of safe and ultralow emission of the flue gas.

The invention discloses a continuous vertical feeding system and method for a fluidized bed reactor. The feeding system comprises a supply system, a vertical discharging section, a horizontal conveying section, a gas conveying system and a pressure adjusting assembly which are connected in sequence. The other end of the horizontal conveying section is connected with a fluidized bed reactor, and the pressure adjusting assembly is connected with the supply system and the gas conveying system. The self-weight of a solid particle reaction material and the effect of an input gas are used to make particle materials uniformly fluidized and transferred to the vertical discharging section from the supply system, then transferred to the horizontal conveying section and continuously uniformly conveyed into a fluidized bed reactor, so the particle material abrasion caused by mechanical feeding is avoided, the fine powder amount is reduced, the entrainment loss of gas-solid reaction is further reduced, the gas amount introduced by pneumatic feeding is greatly reduced, and great benefits are brought to chlorination production.

The preparation process of the solid component of olefin polymerizing catalyst includes first reaction of C2-C8 alcohol and magnesium powder in the molar ratio of 2.0-4.0 in the presence of methane halide to form homogeneous magnesium ligand solution; subsequent addition of electron donor compound to form homogeneous solution and the reaction between the solution with titanium compound to form Mg-Ti ligand solution; the contact reaction between the solution with inorganic oxide carrier to prepare solid catalyst precursor; and final activation of the precursor with alkyl aluminum chloride to obtain the solid catalyst. The solid component of catalyst of the present invention is matched with alkyl aluminum for the polymerization of ethylene and has high catalytic activity and polymer prepared with very small amount of fine powder.

The invention belongs to the technical field of polyacrylamide, and particularly relates to a synthesis method of anti-degradation cationic polyacrylamide, which comprises the following steps: adding an inorganic salt auxiliary agent, acrylamide and acryloyloxyethyl trimethyl ammonium chloride into deionized water according to the mass percent of dry substances, dissolving and mixing to obtain a material solution with a certain mass concentration; and pumping the solution into a polymerization kettle, introducing nitrogen for 40 minutes; then adding a composite initiator, continuing introducing nitrogen for 3 minutes, thickening the feed liquid; then carrying out pressure building polymerization for 3 hours, and carrying out granulation, drying, grinding and other processes on the colloid to obtain a particle product, namely the anti-degradation cationic polyacrylamide. A composite initiation system and free radical aqueous solution polymerization are adopted, so that the viscosity and charge binding force of the product are improved, and the degradation resistance of the product is improved; the product yield is improved, the yield and the quality are improved, the production cost and the use cost are reduced, and the cost performance is higher.

A kind of preparation method of olefin polymerization catalyst solid component, comprises in the presence of halide methane, make C 2 -C 8 Alcohol and magnesium powder react at 20-200°C at a molar ratio of 2.0-4.0:1 to form a uniform magnesium complex solution, then add an electron donor compound to form a uniform solution, and then contact this solution with a titanium compound to form The Mg-Ti complex solution is used to fully contact and react with the inorganic oxide carrier to obtain a solid catalyst precursor, and then the precursor is activated with an alkylaluminum halide to obtain a solid catalyst. The solid component of the catalyst prepared by the method of the invention is used in the polymerization of ethylene in combination with the alkylaluminum, has high catalytic activity, and the amount of fine polymer powder produced is very small.

The invention discloses a method for preparing a spherical magnesium chloride carrier. The method comprises the following steps of: performing alcohol combination reaction on magnesium chloride and fatty alcohol (ROH), dispersing, quenching, solidifying and drying to obtain a carrier precursor, performing primary alcohol removal on the carrier precursor in inert airflow at the temperature of between 30 and 40 DEG C, heating to the temperature of between 41 and 55 EG C, performing secondary alcohol removal, and thus obtaining the spherical magnesium chloride and alcohol carrier. An olefin polymerization catalyst prepared from the carrier obtained after alcohol removal by the method has high catalytic activity, the granular size of the olefin polymerization catalyst is increased, and the fine powder quantity of the olefin polymerization catalyst is reduced.

The invention relates to a wind ring structure of a vertical roller mill. The wind ring structure comprises a wing ring outer ring, a wind ring inner ring and wind guide bodies; and multiple wind guide bodies are fixed between the wind ring outer ring and the wind ring inner ring. The wind ring structure is characterized in that the wind guide bodies consist of horizontal cover plates, first wind guide plates and second wind guide plates; and the horizontal cover plates, the first wind guide plates and the second wind guide plates are connected end to end in sequence to form the air guide bodies with triangular cross sections. The wind ring can perform two times of impact dispersion for materials to improve the material layer stability and the powder milling efficiency, reduces the wind ring design wind speed requirements, improves the powder selection efficiency, reduces the quantity of fine powder returned to a grinding disc, improves the material layer stability, and improves the powder milling efficiency.

The invention belongs to the field of metallurgy and relates to a method for preparing sigma-phase FeV50. The technical problem to the solved of the invention is to provide a method for preparing the sigma-phase FeV50 which has good apparent mass and is easy to break. In the adopted technical scheme, the sigma-phase FeV50 is obtained by uniformly mixing vanadium oxide, aluminum, iron and lime serving as raw materials, feeding the mixture into a furnace and smelting the mixture in an electric arc furnace by an electro-aluminothermic process. The method comprises the following steps of: a, adding excess aluminum into the raw materials while proportioning so as to reduce the vanadium oxide, melting a furnace charge down, depleting slag until vanadium content is low and removing lean slag; and b, adding an appropriate amount of vanadium oxide into alloy liquor from which the slag is removed to remove the excess aluminum, discharging and casting when the temperature and aluminum content ofthe alloy liquor meet requirements and cooling so as to obtain a product, namely, the sigma-phase FeV50. The crush strength of the sigma-phase FeV50 produced by the process is less than 510 MPa and convenience can be brought to vanadium iron manufacturers and customers in the crushing, sampling and using processes of vanadium iron.

A solid catalyst component for preparing alpha-olefin homopolymer or copolymer with high catalytic activity is prepared through reacting between C2-C4 alcohol and Mg powder under existance of halomethane to obtain Mg matches solution, reacting on inorganic carrier, drying to obtain Mg carrier, and reacting on Ti(OR)nCl4-n in inertial hydrocarbon solvent, where R is C2-C8 alkyl and n=0-4.

The invention discloses a light-weight anion foamed ceramic. The light-weight anion foamed ceramic with a double-layer structure is formed by using basic foaming powder and anion foaming powder; correspondingly, the invention also discloses a kind of the above-mentioned A method for preparing lightweight negative ion foamed ceramics; the invention effectively improves the utilization efficiency of negative ion materials and reduces the usage amount of negative ion materials by setting layered design and adding negative ion materials only in the surface layer. At the same time, through the combination of formula structure and preparation process, a foamed ceramic with fine and uniform pore size and high strength is prepared.

The invention discloses a low-temperature dry distillation method of coal, relates to the technical field of full and reasonable utilization of coal resources and particularly relates to a dry distillation method of coal. The method disclosed by the invention can be used for solving the technical problem that the energy consumption is high and the treatment difficulty is great as existing coal ash cannot be dry-distilled until being compressed and moulded. According to the low-temperature dry distillation method of coal, a coal preparation unit, a dry distillation unit, a dry distillation tail gas recovery unit and a dry distillation heat source generating unit are adopted. The coal gas generated by dry distillation is heated by adopting a heat storage type heating furnace as a dry distillation heat source, so that the heat value of the dry distillation coal gas is improved to the maximum extent. A dry distillation grading system is arranged, so that the amount of fine powder entering into a dry distillation furnace is reduced while improving the dry distillation efficiency, and thus the load of oil-sludge separation by a tail gas treatment system is reduced.

The invention especially relates to a crystallization method for large-particle dicumyl peroxide, belonging to the technical field of crystallization of dicumyl peroxide. The crystallization method comprises the following steps: 1) uniformly mixing dicumyl peroxide liquid with an alcoholic solvent so as to obtain a mixed solution; and 2) adding a dicumyl peroxide seed crystal and fine dicumyl peroxide powder into the mixed solution obtained in the step 1), and carrying out cooling crystallization to obtain large-particle dicumyl peroxide. According to the preparation method, the addition of the dicumyl peroxide seed crystal and the fine dicumyl peroxide powder is beneficial for crystal growth and effective inhibition of the generation of fine powder; and the yield of large-particle dicumylperoxide in a prepared dicumyl peroxide product is as high as 95% or above.

The invention relates to the technical field of crystallization of dicumyl peroxide, in particular to a crystallization method of large particle dicumyl peroxide. The crystallization method comprises the following steps: 1) uniformly mixing dicumyl peroxide liquid and alcohol solvent to obtain a mixed solution; 2) adding water and dicumyl peroxide seed crystals to the mixed solution obtained in step 1) and dicumyl peroxide fine powder, crystallized by cooling to obtain the large particle dicumyl peroxide. The preparation method of the present invention adds water, dicumyl peroxide seed crystals and dicumyl peroxide fine powder, which is beneficial to crystal growth and effectively inhibits the generation of fine powder, and large particles in the prepared dicumyl peroxide product The yield of dicumyl peroxide is high, and the yield in industrial production can reach more than 85%.

The invention discloses a method for manufacturing a moisture-free granular flavoring, which comprises the following steps of suspension preparation, mixing, granulation, drying, cooling and screening. The method overcomes the defects of the prior granular flavoring manufacturing method by improving the mixing process of the granular flavoring, and can produce the granular flavoring with good moisture resistance and avoid the problem that the granular flavoring absorbs moisture during use in a kitchen.

The present invention relates to a multi-zone reactor suitable for the continuous fluidized bed polymerization of one or more alpha-olefin monomers, at least one of which is ethylene or propylene, which multi-zone reactor can be used in Operating in condensation mode, the multi-section reactor includes a first section, a second section, a third section, a fourth section and a distribution plate, wherein the first section and the second section separated by the distribution plate, wherein the multi-zone reactor extends vertically, wherein the second zone of the multi-zone reactor is located above the first zone, and wherein the said third section of said multi-zone reactor is located above said second section, and wherein said fourth section of said multi-zone reactor is located above said third section, wherein The second section comprises an inner wall, wherein at least a portion of the inner wall of the second section is in the form of a progressively increasing inner diameter or a continuously open cone, wherein the diameter or the opening is directed towards the A vertically increasing top of a multi-zone reactor, wherein the third zone comprises an inner wall, wherein at least a portion of the inner wall of the third zone is in the form of a progressively increasing inner diameter or a continuous open cone body, wherein said diameter or said opening increases vertically towards the top of said multi-zone reactor, wherein said inner wall of said third zone has a maximum diameter greater than that of said second zone The maximum diameter of the inner wall.

The invention relates to a resin binding product high temperature high temperature granulator and a high temperature granulation method, the method comprises the following steps: heating a rotating cylinder to the temperature of 40-120 DEG C, adding a granulation raw material in the rotating cylinder for mixing, wherein the rotating speed of the rotating cylinder is 5-30rpm, performing high speed intense agitation through a high speed stirring rotor (the speed is 1000-2000rpm) over the rotating cylinder for stirring for 10-60 minutes, finally discharging, and cooling to the room temperature to prepare the finished product mud material. The mud material has stable grain composition and low fine powder quantity, so that the product appears very excellent porosity, volume density and stable strength property, is directly and rapidly dried at anaphase of granulation, and the drying equipment is not required for being added. The technology appears flexible, and the land occupation is small. The technology is not influenced by harsh environment, and has little influence by change of environment, even has no influence by change of environment. According to the high temperature granulation technology, the production cost appears very excellent, compared with a traditional normal temperature granulation technology, the comprehensive cost can be saved by more than 50%.