11results about How to "Reduce overgrinding" patented technology

The invention discloses a grading magnetic-flotation combined beneficiation method for sulfur-oxygen mixed copper ore. The grading magnetic-flotation combined beneficiation method comprises the steps of ore grinding and screening, magnetic separation, grading, copper sulfide flotation, copper oxide roughing and copper oxide enhanced scavenging. According to the method, strong magnetic separation is adopted in the mill grading system to recover part of coarse-grain copper oxide, excessive grinding of copper oxide minerals in the ore grinding process is reduced, early recovery can be achieved, the comprehensive recovery rate of copper oxide is increased, meanwhile, release of copper ions in the ore grinding process is reduced, and the adverse effect on follow-up copper sulfide flotation is relieved. The efficient copper oxide vulcanizing agent is composed of sodium sulfide and sodium pyrosulfite, the stability of a film in the vulcanizing process is enhanced, meanwhile, the inhibition effect on pyrite is enhanced, and the flotation separation efficiency of copper oxide is improved. In addition, by adopting an efficient reagent and precise regulation and control, copper oxide concentrate is directly obtained through open circuit of copper oxide roughing and enhanced scavenging concentrate, and the copper metal falling loss caused by closed cycle is reduced.

The invention discloses an anti-over-grinding crushing and grinding process for easy-to-argillization ore, which mainly comprises the following steps of: crushing raw ore and transferring the crushed raw ore into a surge bin; ore in the surge bin is transferred to a first double-layer vibrating screen for wet type pre-screening, oversize and intermediate products enter the semi-autogenous mill, and undersize products are pumped to the ore discharge end of the semi-autogenous mill. Ore discharged by the semi-autogenous mill and undersize products enter a second double-layer vibrating screen to be classified, oversize products are subjected to hard rock crushing and then return to an ore feeding belt of the semi-autogenous mill, intermediate products enter a lattice type ball mill, and ore grinding products and undersize products of the second double-layer vibrating screen are combined and pumped into a cyclone to be classified. And underflow of the cyclone is classified by a high-frequency sieve, oversize return to a ball mill for regrinding, and overflow and undersize products of the high-frequency sieve are combined into finished ore pulp to be fed into a sorting process. The process flow is simple, one-stage crushing and ore washing and screening before grinding are adopted, and forced discharging equipment such as a semi-autogenous mill is matched, so that over-grinding can be effectively prevented, and the ore grinding energy consumption is reduced.

The invention discloses a low-carbon ore grinding process for improving the yield of a particle fraction of-325 + 400 meshes, and belongs to the technical field of ore grinding. The method comprises the steps that feeding mineral materials are screened; selecting an optimal ratio of the steel balls to the ceramic balls; optimizing the initial loading system and the filling rate of the porcelain balls; selecting the optimal ore grinding concentration; adding a proper amount of steel balls to reduce the under-abrasive fraction; and a steel ball and ceramic ball mixed grinding scheme is determined. According to the invention, the problems of over-grinding phenomenon, low yield of newly generated-0.045 + 0.038 mm and more under-grinding particle size of the existing tower mill taking a steel ball as a medium are solved. According to the method, the ore grinding medium steel balls are replaced by the nano composite ceramic balls, and the nano composite ceramic balls are matched with the steel balls with a certain volume ratio, so that the content of ore grinding products with the size of-0.045 mm is increased, the ore grinding efficiency, the concentrate grade and the recovery rate of the tower mill are improved, energy is saved, consumption is reduced, and meanwhile, the comprehensive benefits of a dressing plant are increased.

The invention discloses a dissociation method of high-roughness quartz sand. The dissociation method comprises the following steps: grading quartz sand samples according to particle sizes; preparing the graded samples into ore pulp, adding a conditioning agent and a dispersing agent, stirring, ultrasonically scrubbing to be neutral, filtering and drying to obtain materials of various particle sizes; screening the material with the particle size of-2mm + 0.6 mm to obtain quartz sand with the particle size of + 0.6 mm, and grinding the quartz sand to the required particle size to obtain a first quartz sand sample; and screening the material with the particle size of-0.6 mm + 0.1 mm, and screening out quartz sand with the particle size of + 0.1 mm to obtain a second quartz sand sample. The first quartz sand sample and the second quartz sand sample are quartz sand after monomer dissociation. According to the method, the pretreatment process of crushing, grading scrubbing and ore grinding is adopted, clay minerals and iron oxide films are separated from the surface of quartz through grading high-concentration scrubbing and mechanical force, and therefore the yield of qualified-grade quartz sand and the ore dressing efficiency are improved.

The embodiment of the present application discloses a kind of flotation column including column, distributor, bubble generator and mixer, during use, slurry is supplied into column by feed inlet, then bubble generator is opened, bubble is output via distributor, open mixer, mixer can form gas-liquid mixed medium, then mixed medium is output via distributor, bubble is contacted with mineral in slurry, hydrophobic mineral in slurry can be captured by bubble and discharged via concentrate outlet, and hydrophilic mineral will not be captured by bubble and discharged via tailings outlet, and based on this, the separation of useful mineral and gangue mineral can be completed.The flotation column provided by the embodiment of the present application, the distributor includes a base and a plurality of nozzles, one end of the plurality of nozzles is connected to the base, and the plurality of nozzles are inclinedly arranged in the height and width directions relative to the base, which can improve the flotation efficiency, the rotating flow field can pre-removal coarse gangue, reduce the phenomenon of gangue overgrinding, reduce energy consumption and reduce the problem of concentrate pollution.

The invention discloses a thermal error compensation method for a numerical control grinding machine. The thermal error compensation method comprises the following steps that S1, the abrasion loss LSM of a grinding wheel is calculated; s2, the thermal deformation LS of the grinding wheel is calculated; s3, calculating the thermal deformation LG of the workpiece; and S4, calculating a thermal error compensation value delta L: delta L = LSM-LS-LG. By compensating the radial thermal expansion of the grinding wheel and the workpiece, over-grinding caused by the radial thermal expansion of the grinding wheel and the workpiece can be reduced, and the machining precision of the numerical control grinding machine is improved; deformation caused by centrifugal force in the running process of the grinding wheel is introduced into compensation of thermal errors, the accuracy of the grinding position of the grinding wheel is improved, and the machining precision of the numerical control grinding machine is further improved.

The invention discloses a soil grinding device, and relates to the technical field of grinding equipment, the soil grinding device comprises a ball mill main body of a cylindrical cavity structure, and one side of the ball mill main body is fixedly connected with a grinding cylinder used for loading a grinding medium and a material; the outer wall of the side, close to the milling cylinder, of the ball mill body is fixedly connected with a transmission device used for driving a cylinder body of the ball mill body to rotate, and the outer walls of the two ends of the milling cylinder are provided with feeding devices used for evenly feeding materials into the ball mill body; the inner wall of the grinding cylinder is fixedly connected with an inner lining plate used for protecting the grinding cylinder from being abraded by grinding media and materials, a circulating oscillation mechanism is arranged in the side, close to the transmission device, of the grinding cylinder, and a track turning mechanism is arranged on the outer wall of the side, close to the grinding cylinder, of the inner lining plate. The circulating oscillation mechanism enables materials to flow and be distributed periodically in the cylinder body through periodic oscillation movement, so that the materials are ground more uniformly.

The invention discloses a machine-column combined copper-nickel rough concentrate regrinding and sorting method for copper-nickel sulfide ore. The method comprises the following steps that S1, first-stage ore grinding is conducted, specifically, raw ore is subjected to first-stage ore grinding and grading; s2, first-stage roughing, wherein water is added into a raw ore product obtained after first-stage grinding and grading in a stirring tank for size mixing; s3, rough concentrate regrinding is conducted, specifically, concentrate obtained after first-stage roughing is conveyed to a regrinding ball mill grading cyclone to be graded; s4, finely selecting the first four tanks in one section once; s5, performing one-section and one-time fine selection for six grooves; s6, first-stage secondary fine selection; s7, one-stage and one-time fine scavenging; s8, second-stage ore grinding; s9, second-stage roughing is conducted; s10, first four tanks are finely selected for the first time in the second section; s11, carrying out second-section primary fine selection on the rear 6 tanks; s12, carrying out second-stage secondary fine selection; s13, second-stage primary fine scavenging is carried out; s14, second-section primary flotation column fine selection is carried out; s15, two-stage primary scavenging is carried out; s16, second-stage secondary scavenging is carried out; and S17, second-section secondary flotation column fine selection is carried out.

The present application relates to a kind of tailings classification scanning device, belong to mineral separation technical field.The device includes: tailings separation unit, with the separation cylinder upper end of mineral separation equipment is connected or with separation cylinder, including tailings overflow weir, configured to discharge tailings in the separation cylinder from the tailings overflow weir;Tailings classification unit is arranged in the periphery of the tailings separation unit, including tailings classification overflow weir, configured to discharge the tailings classified processing, to obtain tailings of different levels;The height value of the tailings classification overflow weir is less than the height value of the tailings overflow weir.The present application can realize the multistage separation of tailings, to obtain different grade and the stable component content of tailings, to reduce the waste of mineral resources, improve the component content qualified rate of each grade product.

The invention discloses a burr-free slitting machining device for a high-frequency high-permeability ultrathin metal strip, and relates to the technical field of strip machining. The device comprises a device body, a mounting plate is fixed to the top of the device body, a slitting knife roller and a slitting groove roller are sequentially and rotationally mounted in the device body from top to bottom, and a driving gear box used for driving the slitting knife roller and the slitting groove roller to rotate is fixed to one side of the device body; a double-guide-roller frame is fixed to the front side of the device body, a single-guide-roller frame is fixed to the rear side of the device body, and two burr removing devices are arranged on the front side of the double-guide-roller frame. Through the arrangement of the burr removing device, the telescopic grinding plate can grind the edge of the slit high-magnetic-conductivity metal strip, burrs on the edge of the high-magnetic-conductivity metal strip can be effectively removed through the telescopic grinding plate, the influence of irregular edges on follow-up machining is reduced, and the uniformity of products is improved.

The invention discloses a beneficiation method for high-magnesium low-grade copper-nickel sulfide ore, which adopts three-stage grinding, reduces the crushing stage, and the grinding particle size is relatively concentrated, which can fine-grind fine-grained materials while reducing over-grinding, so that fine-grained nickel-copper sulfide can be effectively dissociated, and the problem that the coarse particle size is too coarse to fully dissociate useful minerals and the fine particle size is seriously over-grinded in the traditional ball milling is solved, and the recovery rate of nickel-copper metal and the nickel-copper grade of the concentrate are improved. At the same time, a hydrocyclone is used to classify the grinding discharge for multiple times, and the composite force field of gravity and centrifugal force is used to separate fine mud and sediment products, and flotation is performed separately, which reduces the adsorption cover of fine mud materials in the ore pulp on useful metal minerals, increases the contact area between metal minerals and flotation reagents, and thus improves the recovery rate of nickel-copper sulfide.