122results about How to "Wide particle size range" patented technology

A filter element having multiple formed layers of filtration media is disclosed. The media are layered so as to form a pore size gradient. The filter element is capable of removing both solid and liquid particulates from a moving fluid stream. The filter element has high strength and compressibility. The layers can be supported on a porous or perforate support to provide mechanical stability during filtering operations. The filtration media layers can be formed into various filter element forms such as panels, cartridges, inserts, and the like.

A high-density pressurized fluid bed coal gasification device and a method relate to a gasification device and a method which are especially suitable for the efficient treatment of the high-sulfur, high-ash and high ash fusion point coal with high reserve volume in China and have the advantages of broad coal type adaptability, high carbon transformation ratio in the gasification process, high heat value of coal gas, low investment and excellent environment-friendly performance. A gasification reactor (1) is arranged in a pressure shell (2) and is divided into a dense-phase turbulent flow fluidizing section (9), a high-density core-annulus flow section (10) and a density rapid flow section (11) from bottom to top, and according to the gasification character of the goal with high sulfur, high ash and high ash fusion point, flow states with different features are adopted for pressurizing and sectionalized gasification from bottom to top and the pressure for gasification is 1.0-2.5MPa.

The invention provides a device for improving the quality of the coal by pyrolysis, comprising a rotary drier, a pyrolyzer and a heating rotary kiln. The rotary drier is used for receiving and drying raw coal with granularity being less than and equal to 30mm, and is provided with a sleeve structure to directly change heat between the raw coal and the hot flue gas and indirectly change heat between the raw coal and hot semicoke; the pyrolyzer receives mixture of the dried raw coal and the high-temperature semicoke by a feed line of solid material, directly changes heat between the raw coal and the hot semicoke, pyrolyzes the mixture, and is further provided with a heat clamping sleeve accompanied with high-temperature flue gas; and the heating rotary kiln is used for receiving the hot semicoke from the pyrolyzer and processing the hot semicoke by the means of heating. The device for improving the quality of the coal by pyrolysis has flexible operation, good quality of the generated semicoke and the generated tar, high cascade utilization of energy and high system thermal efficiency, properly solving the technical problems such as dust and tar blocking, high dust content in the tar, etc.

The invention discloses a plasma preparation method of spherical titanium powder for 3D printing. Titanium powder in an irregular shape is selected as the raw material; argon carries titanium powder particles to be sprayed into a plasma torch through a feeding gun; the titanium powder particles are rapidly heated and fused, and the fused particles form liquid drops with a high degree of sphericity under the action of surface tension; and crushing gas is introduced to crush the fused liquid drops again, the fused liquid drops are rapidly cooled and solidified to form spherical titanium powder particles under the two different progressively increasing temperature gradients, powder is separated from plasma gas due to the efficient filtering gas, and the spherical powder is collected through a powder collection device. The titanium powder prepared by the method is controllable in component, particle size and degree of sphericity; the prepared spherical titanium powder is high in degree of sphericity, good in mobility, uniform in size distribution, little in impurity, high in compactness, high in quality and used for 3D printing; the preparation process is rapid and easy, and one-time molding is achieved.

The invention discloses a gravity-magnetic composite dry separator, which comprises an upper roller, a lower roller, a belt, a magnetic system, a guiding cover and a high-pressure gas injection atomization device, wherein the belt is arranged between the upper roller and the lower roller and is driven by the upper roller and the lower roller; the magnetic system is arranged between the upper roller and the lower roller and comprises a plurality of magnetic field areas of which the magnetic field intensity is gradually decreased from bottom to top, and thus the surface of the belt forms a magnetic field gradient; a material conveying space is formed between the guiding cover and the belt; the high-pressure gas injection atomization device is used for atomizing materials entering the guiding cover. The invention also discloses a method utilizing the gravity-magnetic composite dry separator for mineral separation.

The invention relates to a micro-nano blocking lubricant for a drilling fluid and a preparation method thereof and belongs to the field of oil and gas field drilling and oilfield chemical auxiliary agents. The micro-nano blocking lubricant for the drilling fluid is prepared from the following components in parts by weight: 100-200 parts of a nano emulsion and 100 parts of composite graphite micropowder. The micro-nano blocking lubricant for the drilling fluid also contains a dispersant. The nanoemulsion is prepared from components including paraffin, white oil, a composite emulsifier, a co-emulsifier and water by a phase inversion emulsification method. The micro-nano blocking lubricant for the drilling fluid can resistant the temperature of 150 DEG C, does not have adverse effects to viscosity of the drilling fluid, can reduce the filter loss of the drilling fluid remarkably, improve the quality of mud cakes remarkably, reduce the frictional resistance of a drilling tool and improve the mechanical drilling speed, and can bridge and block micro-cracks of shale quickly by means of a small size effect to prevent solid particles and a filtrate from invading the stratum to achieve a good blocking effect, so that the micro-nano blocking lubricant for the drilling fluid is particularly suitable for blocking fine throats which are 0.05-50[mu]m.

Provided is a compact thermal spray powder suitable for forming a ceramic thermal spray coating which is compact and excels in durability. The thermal spray powder disclosed herein includes ceramic particles formed of a ceramic material with a melting point equal to or lower than 2000° C. The thermal spray powder is configured such that the peak top of a main peak is in a range of 10 μm or less in a log differential pore volume distribution obtained by a mercury porosimetry, and when the peak top of a second peak is at a fine pore size less than that of the peak top of the main peak, the ratio (H2/H1) of the height H2 of the second peak to the height H1 of the main peak is 0.05 or less.

The invention discloses artificial colour sand and belongs to the field of building coating. The artificial colour sand comprises stone sand and base slurry, wherein stone sand comprises at least one of silica sand, basalt and calcite, the grain size of the stone sand is 30-120 meshes, the base slurry is prepared from the following raw materials in parts by weight: 40-50 parts of fluorocarbon resin, 25-35 parts of base solvent, 0.5-0.9 part of dispersing agent, 0.1-0.3 part of wetting agent, 10-20 parts of colour powder, 18.8-20 parts of cosolvent, 0.1-0.5 part of accelerant, 5-10 parts of coupling agent and 0.5-0.8 part of thickening agent, and the weight ratio of stone sand to base slurry in the artificial colour sand is 19:1. The invention also provides a preparation method of the artificial colour sand. The artificial colour sand is uniform in colour, good in weather resistance, economical and environment-friendly, the problem that natural colour sand is scare is solved, and requirements of building decoration are met.

The invention provides a non-crystal alloy powder, which comprises compounds which contain at least one or a plurality of the non-crystal alloy powder as Zr group, Cu group, Ti group, Ni group and Re group which contain rare-earth elements. Average particle diameters of powder are 50 micrometers-2000 micrometers. The invention also provides a process for preparing the non-crystal alloy powder, which comprises firstly, smelting the non-crystal alloy raw materials as Zr group, Cu group, Ti group, Ni group and Re group under protecting environment or a vacuum condition, and secondly, spraying melted metal into mist under the protecting environment and producing the non-crystal alloy powder with flash cold-settings, wherein the rare-earth elements are added in the first step to be smelted with the non-crystal alloy raw materials. The non-crystal alloy powder which is obtained through the invention has wide grain-size range, and the powder which is prepared can be used for addition agent of antifriction materials. The process for preparation has low requirements for preparing environment and pureness of raw materials, and is applied to productions with commercial scales.

The invention aims to provide a refractory iron ore fines grading combined processing method which is simple, high-efficiency, low in grading cost and high in comprehensive metal recovery rate. A mechanical vibration screen and a spiral classifier are combined for size grading, a method of combining strong magnetic separation and magnetic roasting-low intensity magnetic separation is adopted for processing refractory iron ore with the particle size of 0-15mm, the difficult problems of difficulty in grading particle sizes of a fine-grained iron-containing material and rotary kiln accretion are solved, the particle size range for magnetic roasting of the refractory iron ore is widened, and the resource utilization rate of the refractory iron ore is improved.

The invention discloses a median type tailing damming method utilizing mold bags. The median type tailing damming method has the advantages that the grouted mold bags 7 are piled up to build a downstream dam body 2, the downstream dam body 2 is kept clean and smooth by the sand consolidation effect of the mold bags 7, and the environmental problems such as dust flying, gullying and coarse sand loss are solved well; tailing pulp with the content of tailing particles, smaller than 0.05mm in size, not larger than 40% (by weight) is taken as mold bag filling pulp for the mold bags 7, so that the particle size range of tailing sand available for damming is widened, sand quantity available for the median type tailing damming method is increased, water drainage of the mold bags 7 can be accelerated, solidification can be speeded up, and grouting efficiency of the mold bags 7 is improved; in addition, the action of gravity is fully utilized for grouting, and the mold bags 7 can be grouted by multiple branch ore drawing pipes 92 at the same time, so that cost and energy consumption are reduced, and damming efficiency is improved.

The application discloses a method and system for improving the quality of low-rank coal. The method comprises the following steps: drying to remove water in lignite which is crushed into a preset degree; sorting the dried lignite to remove pulverized coal; conducting destructive distillation on the sorted lignite at a low temperature. According to the application, the adjustability of the whole process is enhanced, and the energy distribution of the system is optimized, so that the adverse impact of pulverized lignite on low-temperature destructive distillation is reduced to the maximum extent, the quality of tar is improved, and the granularity range of quality-improving feed coal is broadened; as severe screening of the feed coal is not required, equipment investment is reduced, and potential accidents of dust pollution and spontaneous combustion are reduced.

The invention discloses a dry magnetic separator with introduced wind power and a mineral magnetic separation method. The dry magnetic separator comprises an outer shell, a feeding device, a ventilation roller barrel, an unloading roller, a concentrate hopper and a tailings hopper, wherein ventilation roller barrel is arranged in the outer shell in a horizontal rotation manner; a low-frequency alternating magnetic field is arranged at the surface of the ventilation roller barrel; a plurality of through holes are uniformly formed in the surface of the ventilation roller barrel; ventilation materials are embedded into the through holes; the ventilation roller barrel is provided with a closed inner cavity; pressure air is introduced into the inner cavity; the feeding device corresponding to the ventilation roller barrel is arranged at the top of the outer shell; the unloading roller is arranged at the right side of the ventilation roller barrel; the concentrate hopper is correspondingly arranged below the unloading roller; the tailings hopper is correspondingly arranged below the ventilation roller barrel. According to the device and the method, the wind power is introduced into the separation and sorting processes of magnetic materials, so that the wind power, gravity and centrifugal force together directly take part in completion with magnetic force, and further the recovery rate of magnetic mineral can be obviously increased, and the concentrate grade is obviously promoted.

The invention discloses a belt-type multi-stage multi-gradient magnetic separator which comprises a magnetic separating device, a multi-stage material conveying device and a tailing conveying device, wherein the magnetic separating device comprises a belt-type conveyer and a magnetic system arranged inside the belt-type conveyer; the multi-stage material conveying device comprises a plurality of belt-type conveyers which are arranged on one same horizontal height and are arranged at intervals; the tailing conveying device is used for receiving and conveying tailings from the multi-stage material conveying device; the magnetic system comprises a plurality of magnetic field areas of which the magnetic field strength is gradually weakened along the material conveying direction; non-magnetic areas are arranged between every two adjacent magnetic field areas; the magnetic field areas cover the gaps between adjacent belt-type conveyers of the multi-stage material conveying device. The invention further discloses a method for mineral separation by using the belt-type multi-stage multi-gradient magnetic separator.

The invention provides a cermet composite material and a coating preparation method thereof, belongs to the field of thermal spraying in composite materials and surface engineering, and particularly relates to a preparation method for metal-based composite powder with low thermal conductivity and a coating thereof by atmospheric plasma spraying. The method comprises the following steps that iron-based amorphous powder prepared by the high pressure nitrogen gas atomization method is mixed with zirconia powder prepared by the agglomeration sintering method according to a certain mass ratio, andfinally the composite powder with a better sphericity and a particle size of 25-75 [mu]m is obtained. The iron-based-ceramic composite coating is prepared by adopting the atmospheric plasma spraying mode, and the composite coating prepared has relatively low thermal conductivity, and can be used for insulation protection for hot end parts of a diesel engine.

The invention relates to non-steam autoclaved PHC tubular pile concrete, and belongs to the technical field of concrete materials. The non-steam autoclaved PHC tubular pile concrete is composed of a gelling main material, gelling auxiliary materials, a fine aggregate, a coarse aggregate, an admixture, expansion agents, an adhesive, a water reducing agent and a water storage agent, in particular, triethanolamine, lithium sulfate, nitrite, phosphoric acid, copper monoxide powder, aluminum hydroxide are used as the gelling auxiliary materials, tartaric acid, sodium silicate, calcium sulphoaluminate, magnesium oxide, calcium oxide and anhydrite are used as the expansion agents, and hydroxypropyl methylcellulose is used as the water storage agent. PHC tubular piles produced by the concrete havethe good working performance under the normal-temperature non-steam autoclaved condition, the gas content of the concrete is greatly decreased, the contraction amplitude can be lowered, and cracks are avoided; the early strong progress is advanced, the later compressive strength is increased, and the speed is high; the durability and relative dynamic elasticity modulus are also greatly improved,the anti-freezing and anti-cracking properties are high, and any micro-crack is avoided after a large number of subcycles of freeze thawing; and the cost can further be lowered, and the environmentalpollution is reduced.

A self-cleaning type efficient electronic air cleaner combining the electrostatic dusting principle with the traditional dusting principle is composed of a flow homogenizing plate for primary filtering, an ionizing region, a dust gathering region with the electrode plates made of the folded metallic mesh and the automatic dust sucking modules in the included angle of each folded metallic mesh, and an automatic dust discharging unit.

The invention relates to a method for improving an underground coal mine negative pressure suction dust removal technology. According to the method, a horn opening, high-pressure water jet pumps and high-pressure gas jet pumps are additionally arranged in front of an air inlet of an axial flow fan, and a water film dust removal barrel is additionally arranged at an air outlet of the axial flow fan; water, dust and fog are fully mixed through the high-pressure water jet pumps, the high-pressure gas jet pumps and the axial flow fan, and then the water, dust and fog are separated out by the water film dust removal barrel. The method for improving the underground coal mine negative pressure suction dust removal technology has the advantages of being small in investment, fast to take effect, obvious in dust removal effect and suitable for coal mine driving face dust removal.

The invention relates to a magnetic separation and deinking method for waste paper, comprising the following steps: (1) adding waste paper and magnetic seeds in a pulper, adding water, sodium silicate and NaOH for repulping, wherein the repulping conditions are as follows: the magnetic seed dosage is 0.05-0.2wt%, the dosage of sodium silicate is 2-10wt%, NaOH is used to regulate the pH value to be 7-10, and the pulp concentration is 10-15wt%; (2) adding water for diluting after water paper repulping until the pulp concentration to be 0.5-4wt%, adding flocculant which accounts for 0.01-0.1wt% of dry paper into the pulp after repulping for magnetic seed flocculation, enabling the deciduous ink particles to be adhered with magnetic seeds, wherein the pH value is 7.0-11.0, the time is 10-30min, and the stirring speed is 200-1000rpm; and (3) separating the flocculated ink particles from the pulp by a deinking device for size after magnetic seed flocculation. The method in the invention can obviously improve pulp whitness and fiber yield of water paper, and can be used for producing deinking pulp with high whiteness and high deinking rate and small amount of paper fiber loss.

The invention discloses a leather waste vaporizing combustion and heat recovery system, and an operation method thereof. The operation method comprises the steps that leather waste is subjected to high-temperature cyclone vaporizing in a section of the vaporizing combustion and heat recovery system; after gas is separated from liquid ash, the gas enters a second section and is supplemented with excessive air, so that the gas is combusted completely; flue gas generated after the gas is combusted completely enters waste heat recovery equipment, so that waste heat is recovered; and finally, the flue gas is discharged after purification and dust removal. The system is simple in structure and high in combustion intensity, can reduce pollutants effectively, and achieves clean recycling of the leather waste.

The invention discloses a production method of high-quality ultrafine light calcium carbonate, belonging to the technical field of calcium carbonate production. A production method of high-quality ultrafine light calcium carbonate is characterized in that it comprises the following steps: (1) using limestone as raw material, putting it into a reaction furnace for heating and calcining to obtain calcium oxide, and sealing it for later use after cooling; Calcium is added to impurity-free water, stirred for 2-4h, and calcium hydroxide slurry is obtained after cooling down; (3) Carbon dioxide gas is introduced into the calcium hydroxide slurry at room temperature for carbonization, and carbonized to the pH of the calcium hydroxide slurry It is 6.5-7.5, obtains calcium carbonate slurry, stops carbonization; (4) puts the calcium carbonate slurry that step (3) obtains into storage tank and leaves standstill 10-12h, makes its pH value stabilize. The object of the present invention is to provide a production method of high-quality ultrafine light calcium carbonate, which is simple in operation, stable in quality, and capable of efficiently preparing high-quality ultrafine light calcium carbonate.