49results about How to "Reduce over crushing" patented technology

The invention belongs to a coal washing method and discloses a gravity separation middling coal separation technology. Gravity separation middling coal is fed into rough grinding equipment. Products obtained after rough grinding is fed into screening equipment for primary classifying, and primary plus-sieve products and primary minus-sieve products are obtained. The primary plus-sieve products are fed into a dense medium cyclone for separation. The primary minus-sieve products are fed into separation equipment for secondary classification, and secondary plus-sieve products and secondary minus-sieve products are obtained. The secondary plus-sieve products are fed into fine grinding equipment for fine grinding. Products obtained after fine grinding and the secondary minus-sieve products are fed into size mixing equipment together for completing flotation. Two-time ore grinding, gravity separation and floatation combination and classifying separation are combined to separate gravity separation middling coal, under the premise that the middling coal dissociation degree is improved, the phenomena of over crushing are reduced, equipment separation efficiency is obviously improved, clean coal in the middling coal is recycled to the maximum degree, the coal preparation plant clean coal productivity is increased, and enterprise economical benefit is improved.

The invention provides a fluorite lean ore color sorting upgrading-tailing pre-sorting method. The method comprises the following steps that (1) fluorite lean ore is crushed through two sections of closed circuits, and crushed products are -15 mm; (2) the crushed products are screened to obtain oversize products and undersize products, wherein the size of sieve pores is 5 mm, and the oversize products enter a first section color sorter for fluorite upgrading and sorting to obtain lump ore concentrates; (3) tailings sorted through the first section of color sorter enter into a second-section color sorter for tailing discarding sorting to obtain lump ore tailings and lump ore middlings; and (4) the undersize products in the step (2) and the lump ore middlings in the step (3) are mixed and ground, and then flotation is conducted. According to the method, the raw ore amount entering a ball mill is greatly reduced by pre-upgrading and sorting and pre-tailings-discarding of a large quantityof hard minerals, so that the beneficiation feed grade is improved, over-crushing of the hard minerals to the fluorite in the ore grinding process is reduced, so that the production cost is reduced, and the sorting quality is improved.

The invention relates to classifying equipment, in particular to a centrifugal classifier, which comprises a body, a feed pipe opening, a discharge pipe, a sand discharge port, a discharger, an impeller, an air inlet, a cover, a motor, an end cover and a rotation shaft. The centrifugal classifier is characterized in that the upper part of the body is sealed by the end cover, a separating cover is fixedly arranged on the upper end of a hollow cavity body in the body and connected with one end of the discharge pipe, the other end of the discharge pipe extends outside the body, and a feed pipe is fixedly arranged on the side of the body; the motor is fixedly arranged on the upper part of the body and is in driving connection with the impeller through the rotation shaft which extends into the body and is coaxial with the body; the impeller is arranged on the lower end of the separating cover, a sleeve is sheathed outside the rotation shaft, and the air inlet is formed in the side wall of the sleeve, which is positioned in the separating cover; and the discharger is connected to the bottom of the body, and the lower end of the discharger is connected with the sand discharge port. The centrifugal classifier has the advantages of high classifying efficiency, certain classifying particle size, stable classifying effect, energy saving and wear resistance, and the classifying particle size can be regulated.

A process for industrially preparing superfine powder or powder slurry includes such steps as breaking raw material to become particles equal to or less than 3 mm, multi-stage pulverizing to become superfine powder, and directly mixing it with water to become powder slurry. Its multifunctional superfine pulverizing system is also disclosed.

The invention discloses an ore grinding process for lowering energy consumption of ore grinding and reducing over-crushing. The ore grinding process comprises the steps that firstly, crushed materialsare classified in advance through a first-stage linear vibrating screen, oversize materials enter a high-pressure roller mill to be milled, high-pressure roller milled products are inspected and graded through a second-stage linear vibrating screen, undersize materials of the first-stage linear vibrating screen and oversize materials of the second-stage linear vibrating screen are merged and thenfed into a first-stage ball mill, first-stage ball mill discharged ore and undersize materials of the second-stage linear vibrating screen jointly enter a hydrocyclone set to be subjected to in-advance inspection and classification, classified overflow is fed into a high-frequency vibrating fine screen to be inspected, controlled and classified, oversize materials of the high-frequency vibratingfine screen and hydrocyclone settled sand are fed into a second-stage ball mill to form a closed loop. According to the ore grinding process, the high-pressure roller mill and the sieving link is additionally arranged, the qualified particle grade is separated in time, the ore grinding amount entering the ball mill is decreased, and the purposes of lowering the energy consumption of ore grinding and reducing over-crushing are achieved; and the mode of combination of the hydrocyclone set and the high-frequency vibrating fine screen is adopted in second-stage ore grinding classification, and therationality of the feed particle size is ensured.

The invention relates to a compound classification method and equipment for a ground ore product, belonging to the technical field of ore processing. The compound classification method is characterized by combining vibration screening with spiral classification methods and comprising the following steps of: firstly carrying out vibration screening on the ground ore product with a double-layer chute vibrating screen to obtain a plus sieve material and a minus sieve material, then directly conveying the plus sieve material to a spiral classifier for classification, returning the coarse material to an ore grinding machine for grinding again, overflowing and discharging the fine material from both sides of the classifier, mixing with the minus sieve material and conveying to subsequent sorting operation, wherein the chute vibrating screen is arranged beside the spiral classifier, the end of the ore discharge chute of the chute vibrating screen is directly connected with the ore feeding port on the tank body of the spiral classifier, and the classification region tank body of the spiral classifier is higher than conventional tank body. The compound classification method and equipment have the advantages of significantly reducing the derichment of fine-grained heavy ore in settled sand and returned sand, low closed-circuit ore grinding over-grinding and inclusion in settled sand, high classification efficiency, achieving direct closed-circuit with the ore grinding machine and the like, and can be used for transforming existing ground ore classification equipment and manufacturing novel screening-spiral compound classifiers supporting the use of the ore grinding machine.

The invention concretely relates to a micro-fine particle grade horizontal grinding device. The grinding device is composed of a grinding chamber and a drive mechanism; the barrel installation center line of the grinding chamber is horizontal and the horizontal length in the barrel is 1.5-2.5 times of the inner circle diameter of the barrel and the inner surface of the barrel is abrasion resistance material and the grinding medium (18) is filled into the barrel; the 5-8 agitating vanes (8) are vertically mounted on the main axle (6) coincident with the barrel center line and a material discharging device is set at the right downside of the left end of the barrel and a material feeding port (7) is set on the right upside of the right end of the barrel; the left end of the main axle (6) is mounted in a bearing liner (13) and the bearing linear (13) is fixed on the center of the left end cover (12) of the barrel and the right end of the main axle (6) passes through a bearing (2) and is connected with the motor by a shaft coupling (1); an accessory impeller (5) is mounted on the main axle (6) of the right side of the barrel. The material pulp of the device is brushed under the high-speed mobile grinding medium colliding, grinding action with features of simple start, large medium energy density and high grinding efficiency.

An inner classified ball mill includes a ball grinding cylinder, which is driven by a transmission device to rotate. One side of the ball grinding cylinder is open. The opening position is equipped with a stator disc, which is fixed on a sliding seat. The stator disc and the ball grinding cylinder form a ball grinding cavity. The sliding seat is installed on a rail seat. A classifier, an adjustable air inlet pipe and a feed screw conveyer are fixed on the stator disc. An impeller of the classifier is arranged in the ball grinding cavity. The present invention can realize the classification of fines in the ball grinding cavity. The over grinding of the materials is reduced. The condition that superfine powder hinders the grinding of crude materials can be avoided. The grinding efficiency is greatly improved. The equipment energy loss is lowered. And the mill has the advantages of simple structure and less occupied area and can be used for the grinding of heat-sensitive materials.

The invention discloses a method for forming blade material particles special for wire-electrode cutting of a semiconductor material and an ultra-hard material, which comprises the steps of: 1, selecting a 6H-SiC silicon carbide or silicon carbide compound diamond ultra-hard material as a raw material; 2, feeding the raw material into a grinding machine to be ground; 3, carrying out primary grading on ground powder by an air inducing device, selecting fine particles with 16 micrometers for carrying out secondary grading, returning rough particles with 16 micrometers to the grinding machine to be continuously ground; 4, feeding finished particles of 16-5 micrometers through secondary grading to a packaging bin for packaging; and 5, feeding the fine particles with micrometer grade as a secondary product to a cyclone device for collecting. The particle forming method can meet the requirement for particle forming of free multiple wire-electrode cutting of the semiconductor material at present on a particle blade product, also satisfies the requirement for the preparation formation of blade particles special for a solidification jigsaw, lays the technical foundation for the free multiple wire-electrode cutting of the semiconductor material, and becomes the low-consumption and pollution-free processing manner.

The invention relates to a magnetic-gravity-magnetic combined separation process for treating lean magnetite. The process comprises the following step of feeding the magnetite with a grade of 24%-30% to be sequentially subjected to first-section closed circuit grinding and first-section weak magnetic separation to obtain first-section weak magnetic separation concentrate; and the process is characterized in that the first-section weak magnetic separation concentrate is sequentially subjected to subsequent gravity and weak magnetic separation combined operation, secondary grinding grading operation and third-section weak magnetic separation operation to obtain final concentrate and final tailings; the gravity and weak magnetic separation combined operation is performed through a spiral chute, a fine screen and a two-section weak magnetic separation machine, wherein a gravity separation process performed through the spiral chute is a gravity separation process of once coarse separation, once fine separation and once sweeping, the two-section weak magnetic separation machine is used for treating sweeping snail tailings, the fine screen is used for treating fine snail concentrate, and gravity separation concentrate is obtained; and secondary grinding grading operation and three-section weak magnetic separation operation are performed on the ores during the gravity and weak magnetic separation combined operation to obtain weak magnetic separation concentrate. The process has the advantages that the process is simplified, coarse grains are fined, over-grinding is reduced, energy is conserved, consumption is reduced and capability of a ball mill is released.

The invention discloses a steel-ball-free ore grinding method. The steel-ball-free ore grinding method comprises the following steps: ore with the grinding particle size P80 of 2.5-3.0 mm is fed into an ore grinding machine, and first-stage ore grinding is carried out; an ore grinding medium of a mixed ceramic section is loaded into the ore grinding machine, and the mixed ceramic section comprises cylindrical ceramic sections with different lengths and different diameters; the P80 of an overflow product of a classifier is controlled to be 0.5-0.3 mm, and if the ore dressing granularity requirement is met, only first-stage ore grinding is carried out; and if the ore dressing granularity requirement is not met, second-stage ore grinding is carried out, and during second-stage ore grinding, an ore grinding medium mixed with ceramic balls is loaded into the ore grinding machine. According to the steel-ball-free ore grinding method, the mixed ceramic section is used as the ore grinding medium, crushing is carried out mainly by line contact and supplemented by surface contact, efficient grinding can be carried out in the ore grinding process, and the over-crushing generation rate of ore grinding products can be reduced; and besides, an ore grinding section can be a one-section ore grinding process or a multi-section ore grinding process, and the ore grinding machine mainly adopts a horizontal ball mill, so that the ore grinding requirements of different ores and different metal disseminated particle sizes can be met.

The invention discloses a beneficiation method capable of recycling valuable metal from tin magnetic pyrite. The method comprises graded ore grinding work, magnetic separation work, thick flotation work and reselection work. The method has the beneficial effects that a bar grinding machine is adopted to grade ground ore in advance, over pulverizing of tin stone can be reduced, the single separation degree of the tin stone can be increased, and the precondition is provided for effective recycling of the tin stone; secondly, magnetic separation is adopted to remove the magnetic pyrite with the large proportion and the higher iron containing rate, floatation is adopted to remove the magnetic pyrite with the large proportion and the higher sulphur containing rate, disturbance of heavy mineral is reduced, and the advantage is created for subsequent reselection and separation of tin stone; thirdly, the middling re-grinding and reselection flow is adopted, energy consumption of ore grinding can be reduced, over pulverizing of the tin stone is reduced, the single separation degree of tin stone can be improved, the cost is low, and industrial production is easily achieved; fourthly, secondary pollutions in the production process are not needed, and the method is friendly to the environment.

The invention discloses a grinding medium adopting a shape of a dual-spherical hexagonal prism, belongs to the grinding medium, and mainly relates to the shape, material components, a processing technology and a metallographic structure of the medium. According to the grinding medium, the problem that over-crushing is serious, that is, the particle size is smaller than or equal to 10 mu m, in the grinding process of the spherical grinding medium is solved; the grinding medium adopts the shape of the dual-spherical hexagonal prism and mainly adopts surface contact, line contact, point contact and mixing contact in the grinding process. The material components are used for guaranteeing the wear resistance of the grinding medium, and the processing technology mainly aims to improve the hardness of the grinding medium. The grinding medium adopting the shape of the dual-spherical hexagonal prism is mainly applied to a metallic mineral grinding process and preparation of other materials with narrow and fine fraction.

The invention provides a rotary uniparted hyperboloid coring and chambering rock-plug blasting method. The method comprises the steps that laser orientation drilling is conducted along at least one coring hyperboloid which is coaxial with a rock plug, and a levo/dextro linear generatrix of at least one chambering hyperboloid on the underwater or non-underwater rock plug, hyperbolic coring holes and chambered holes with high-precision linear generatrices are obtained, explosives are installed in the hyperbolic coring holes and the chambered holes, and blasting is conducted sequentially from inside to outside; due to the fact that the drilled holes in the waist portion of the coring hyperboloid are distributed densely and serve as a high-temperature and high-pressure center at the moment of blasting, blast crushed stones are cast towards the two ends of the hyperboloid, a bidirectional coring mechanism is achieved, through decoupling charge, over crushing is relieved advantageously, the proportion of casting work is increased, a good pinpoint blasting effect and a good outlining blasting effect are achieved for a cored body, and towering conditions are created for subsequent blasting; and hyperbolic chamber can be qualified to transitional linkage chambering blasting of an annular and tubular rock mass with a thick waist portion and two thin ends after the rock plug is cored and is through. The hyperbolic holes can also be used for rock plug pre-splitting or smooth surface forming blasting.

The invention discloses a process for preparing coking charging coal, and various kinds of coking coal conveyed from coal storing apparatuses are separated; if the fineness of the coal satisfies the requirement, the coal is directly conveyed to a coal blending apparatus for storage through an electro hydraulic reverse turning bed without crushing; if the fineness of the coal does not satisfy the requirement, the kind of coal is turned by the electro hydraulic reverse turning bed and is crushed by an newly established crushing apparatus, and after crushing, the coal is conveyed to the coal blending apparatus for storage; various kinds of coking coals of different finenesses are automatically blended into a mixed coal in the coal blending apparatus according to the coal blending ratio determined by a coal blending test, and after mixing by a coal mixing apparatus, the charging coal which meets the fineness requirement is conveyed to the top of a coal tower for coking production of a coke oven; compared with the prior process for preparing the charging coal in domestic coking enterprises with a first coal blending step and a second crushing step, the process provided by the invention with a first crushing step and a second coal blending step without influencing the production condition contains the following steps: crushing various kinds of coal into different finenesses, blending coals, mixing coals and conveying the coals to the top of the coal tower for coking production in the coke oven. The invention has the advantages of uniform distribution of charging coal particle fractions, improved charging coal pile proportion, obviously reduced over crushing of coking coal and fat coal, thereby improving production capacity of the coke oven as well as stabilizing or improving the quality of the coke.

The invention provides a processing technology of cement clinker. The processing technology comprises a barrel, a feeding bin, a discharging bin, a feeding port, a discharging port, a supporting seat,a large gear, a motor, a speed reducer, a small gear, a lining, a partition plate mechanism and an iron ball. The feeding bin is movably mounted on one side of the barrel, and the discharging bin ismovably mounted on the other side of the barrel. The feeding port and the discharging port are formed in the sides, away from the barrel, of the outer surfaces of the upper ends of the feeding bin andthe discharging bin correspondingly, the supporting seat is fixedly installed at the lower ends of the feeding bin and the discharging bin, and the large gear is connected to the side, close to the discharging bin, of the outer surface of the barrel in a sleeving mode. The motor is movabley installed to the side, close to the discharging bin, of the lower end of the front of the barrel. The speedreducer is movably installed on one side of the motor. According to a processing device of cement clinker, multi-section type ball milling is adopted, a partition plate can be prevented from being blocked by cement, feeding is not likely to be blocked, the ball milling efficiency is high, and the inner wall of the barrel is convenient to clean.

The invention discloses a construction method for converting dangerous rock treatment blasting material into dam filling-level burdening. The construction method comprises the following steps that 1),slope cutting construction is carried out through a deep hole bench blasting method, and sloping is carried out on trailing edge mother rock; 2), blast hole drilling operation is performed by using adrilling machine, and the blast hole drilling angle is the same as the designed slope angle; 3), the blast holes are filled with explosives in an interval charging mode, and detonating is carried outby adopting a single-hole single-sound detonation network; and 4), after layered and sectioned excavation, the blasting slag materials are transferred through a dump truck, and the blasting slag materials are pushed to a material taking platform through a bulldozer. By the adoption of the method, the purpose of changing blasting gradation is achieved by optimizing blasting parameters, the proportion of large-diameter stones after blasting is increased, and when the large-diameter stones are blasted and pushed to the material taking platform, stone sources meeting other construction projects are formed by means of collision of the large-diameter stones, and the purpose of directly applying the blasting slag materials to dam construction can be achieved.