114results about How to "Reduce overgrinding" patented technology

The invention relates to a benefication technology of extra poor hematite, which is characterized by comprising the following steps: feeding a raw ore in a closed circuit grinding system composed of a primary ball mill and a spiral classifying mechanism, feeding in a weak magnetic machine for benefication after primary classification and overflow, feeding the weak magnetic tailing in a strong magnetic machine, feeding a mixed magnetic concentrate composed of a weak magnetic concentrate and a strong magnetic concentrate in a spiral chute, obtaining a selected spiral concentrate as a coarse grain concentrate after the coarse grains are subjected to two-stage spiral chute benefication, performing self-circulation on the middling in the selected spiral chute, forming the middling by a roughly selected spiral tailing and a selected spiral tailing, feeding the middling in an open circuit grinding system composed of secondary classifying and secondary grinding for re-grinding, returning to the weak magnetic machine after re-grinding, feeding the overflow of a swirler after benefication of a centrifuge into a table for benefication, merging a table middling, table slurry and a table tailing into a table tailing, merging the strong magnetic tailing, a centrifugal tailing and a table tailing as a final tailing, and merging the selected spiral chute concentrate and the table concentrate into a final concentrate. The invention can improve the milling grade of follow-up operations of the extra poor hematite, reduce the re-grinding amount of the middlings, and is favor of acquiring better beneficiation indexes.

The present invention is directed to flotation of refractory gold sulfide ores in which the ore is ground, floated, the tailings reground, and refloated to produce gold-bearing concentrates.

The invention discloses a scheelite beneficiation method. The scheelite beneficiation method comprises the steps of: roughly grinding raw mineral with no need of desliming; screening the raw mineral in a sieve with 200-250mu m, roughly grinding the material on the sieve again, carrying out strong magnetic separation and discarding on the mineral under the sieve, wherein mainly magnetic garnets and other magenetic minerals are mainly discarded; carrying out scheelite normal temperature flotation on the nonmagnetic mineral after the nonmagnetic mineral is finely ground; carrying out scheelite warming flotation on concentrate obtained after the rough flotation to obtain scheelite concentrate; and carrying out normal temperature floatation on discarded magnetic concentrate, adding flotation middlings into the nonmagnetic scheelite concentrate to be finely ground. The scheelite beneficiation method aims at the mineral characteristics of the scheelite, the raw mineral contains a large amount of weak magnetism calcium and iron garnet gangue, so the recovery rate can be influenced due to the argillization caused by excessive grinding. The scheelite beneficiation method utilizes a ferromagnetic beneficiation method to effectively separate the magnetic ores, so that the excessive grinding condition is lowered, and the scheelite is preliminarily separated and beneficiated. The scheelite beneficiation method can enhance the mineral grinding efficiency, reduces the mineral grinding energy consumption, enhance the selection grade of the scheelite, reduces the beneficiation amount of the flotation, lowers the dosage of flotation reagents, and enhances the total recovery rate of the scheelite. The scheelite beneficiation method is especially suitable for medium grade and low grade scheelite beneficiation.

The invention discloses a method for producing calcined kaolin with high covering power and belongs to the technical field of calcined kaolin. The invention provides a method for producing calcined kaolin which is high in whiteness, superfine in grain size and centralized in particle size distribution and has the advantages of high oil absorption amount and high covering power. The method for producing calcined kaolin with high covering power provided by the invention comprises the following steps: performing dosing, coarse crushing, milling, pulping, horizontal screwing, disc treatment, filter pressing and spray drying on coal gangue or kaolinite rock, crushing and reducing the aggregated spray, calcining for performing decarbonizing and whitening, crystal water removal and forming a gap structure, and finally, aggregating the depolymerized and calcined materials, thereby obtaining the finished product. The method disclosed by the invention is mainly applied to the aspect of kaolin.

The invention relates to a separation process for magnetic red mixed ore based on iron material disseminated particle size treatment. The process comprises the operation of feeding the mixed ore withthe grade of 27%-29% and with magnetite as a main raw material into first-section closed circuit ore grinding operation to obtain a primary grading overflow product, and is characterized by further comprising first-section weak magnetic and strong magnetic operation, fine screening operation, first-section magnetic separation and first-section washing magnetic separation operation, second-sectionclosed circuits ore grinding operation, second-section weak magnetic strong magnetic operation, second-section magnetic separation and washing magnetic separation operation, third-section closed circuit ore grinding, third-section weak magnetic strong magnetic operation and reverse flotation operation. The final concentrate with the grade of 66%-66.5% is obtained through the operation. Compared with the prior art, the separation process has the advantages that 1) an efficient separation process which is characterized in that the concentrate can be obtained once dissociation is achieved and segmented ore grinding, segmented concentrate taking and segmented tailings discharging are achieved is provided for the magnetic red mixed ore with the non-uniform iron material disseminated particle sizes, so that overgrinding is reduced, and energy conservation and consumption reduction are achieved; 2) magnetic separation equipment is adopted for upgrading, and three sections of ore grinding is carried out by adopting vertical mills; and 3) the process is simple in structure, free of middling circulation, easy to implement on site and easy to produce and manage.

The invention provides a cement grinding aid. The cement grinding aid comprises raw materials as follows: triethanolamine, polyether polyol, sodium hydroxide, sodium thiosulfate and a biochemical waste liquid, wherein the biochemical waste liquid is one of or a mixture of a waste liquid produced during production of industrial sodium gluconate and a waste liquid produced during production of an industrial itaconic acid product. The cement grinding aid can optimize the cement grain composition, activate the early strength of cement, improve the powder grinding efficiency of the cement and reduce energy consumption.

The invention relates to a technological method for improving the quality of vanadium-titanium iron concentrates. Various techniques are integrated. The technological method includes preliminary classification, fine screening classification, three-section ore grinding, concentration magnetic separation and stair magnetic separation. In preliminary classification, a qualified fraction part good indissociation in rough iron concentrates can be effectively classified out, the treatment capability of a mill is improved, and energy consumption of the product is lowered. In fine screening classification, a fine screening closed loop is adopted for cyclic ore grinding, compared with common rotational flow classification, classification is conducted strictly according to the particle size, meanwhile, the classification efficiency reaches up to 70% or higher, the qualified fraction is better classified out in time, excessive grinding is reduced, and cyclic loads are reduced. In concentration magnetic separation, concentration magnetic section is adopted before ore grinding, part of weak magnetic titanium ore and gangue can be removed out, excessive grinding of the titanium ore is reduced,and the titanium iron ore recycling rate is increased; and meanwhile, the ground ore grade is improved, the yield is increased, and the product cost is reduced. In stair magnetic separation, iron andtitanium separation is well achieved, and the iron concentrate grade is improved step by step.

The invention discloses an efficient mineral processing technology achieved through cooperation of a high-pressure grinding roller and a magnetic field screening machine. The efficient mineral processing technology is scientific and simple in technological process and low in operating cost. The high-pressure grinding roller is high in reduction ration and small in product particle size, and therefore the iron mineral monomer separation degree is effectively improved during crushing operation, and the processing capacity of the grinding roller is greatly improved. For high-pressure roller fine fraction products, part of qualified iron core concentration where monomer separation is conducted is selected through the magnetic field screening machine, and therefore the excessive grinding amount and the grinding and separating operation ore quantity are effectively decreased, energy conservation and consumption reduction are achieved, and economic benefits are obvious.

The invention relates to the field of cement production, in particular to a method for preparing a cement grinding aid; (1) raw material preparation: weigh the raw materials according to the parts by mass: 10-15 parts of propylene glycol, 3-5 parts of unsaturated polyester resin, 6-12 parts of sodium thiosulfate, 2-8 parts of calcium formate, 0.6-0.8 parts of Tween-80, 6-12 parts of alkyl polyglycosides, 10-30 parts of maleic anhydride, 2-6 parts of nano silicon dioxide , 2.4-5.6 parts of sodium hexametaphosphate, 2-6 parts of allyl polyoxyethylene ether, 1.8-4.8 parts of water-retaining cellulose; (2) preparation of modified triethanolamine; (3) preparation of grinding aid: step Take 5-25 parts of modified triethanolamine prepared in (2) and add it to the stirrer, then add the raw materials except calcium formate and sodium thiosulfate, mix and stir evenly, carry out a polymerization reaction at 75°C for 5h, add calcium formate, sulfur Substitute sodium sulfate, after stirring evenly, drying to obtain the grinding aid; the method of the invention is simple and the production cost is low; the prepared cement grinding aid has the advantages of good water retention, and can improve the specific surface area and appearance of cement.

The invention discloses a method of using a vertical mill for drying calcium carbide. Wet-discharged calcium carbide slag with a pre-drying water content of 12 percent and 18 percent is used as a raw material and is mixed with auxiliary raw materials, such as sandstone, sulfate slag and the like after calculation to be sent into a vertical mill. After entering the vertical mill and being rolled by mill rollers, the materials are rolled and splashed to the part of an air ring on the edge of a millstone and is carried up by the currents of the air ring of kiln tail waste gas, and the air ring has a high speed of 70 mm to 90 mm per second. Wet materials and the kiln tail waste gas have heat exchange, the powdery material after the heat exchange rises together with the currents to pass through the upper shell of the mill to enter the stage separation area of a separator, wherein the coarse powder falls back to the millstone and is milled again with the new-fed material, and the qualified fine powder after stage separation is together discharged out from the vertical mill with the currents to be collected as a finished product by a collector. The method provided by the invention can integrate the homogenization, the drying, the milling and the stage separation of the material into a whole, reinforces the homogenizing and drying functions, solves the problems that the calcium carbide has a high water content and fine granularity and can not be easily dried and milled, and has simple and compact technical procedures, high heat efficiency and low electric consumption.

The invention relates to a process for removing impurities from bauxite, in particular to an ore grinding flotation silicon-removing method of bauxite, which comprises the steps of: carrying out primary floatation on the bauxite after rough grinding, wherein the floated foam is used as a concentrate product; carrying out secondary ore grinding on floating underflow; and carrying out secondary floatation after secondary ore grinding, wherein the floated foam is used as a concentrate product and the underflow is used as tailings to be discharged. The invention has the characteristics of proper granularity of flotation pulp, reasonable fraction distribution, shortened process flow, reduced mineral dressing cost and improved floatation recycling rate due to the adoption of reasonable configuration of ore grinding and floating and equipment selection.

The invention discloses a two-segment mineral grinding-classification process, it grinds the bauxite and lime in the rod mill, the grinded raw mine pulp is poured into a pump pool. The classified bottom flow after classified by water swirler is grinded in ball grinder, adjusts the best liquid and solid rate with proper alkali liquid, the discharged mine pulp is poured into the same pump pool, and adds in alkali liquid to maintain the solid content at 470-520g/L, and carries on classification to the compound mine pulp in the water swirler, the bottom flow enters the ball grinder to be grinded.

The invention relates to a cylindrical medium proportioning method for fine grinding of collophanite. The method comprises the steps of determining the mechanical property of ores, performing screen analysis on feedstock of a grinding machine, deducting the grinding grade which is not required, converting the composition of the feeding size to be ground, calculating the steel ball diameter required by ore grains in all grades with a Duan's sphere diameter semi-theoretical formula, determining the steel ball ratio of the grinding machine according to the ore grain yield of each group of the feedstock to be ground and the yield of the required steel balls in different diameters, and then determining the ratio of the cylindrical mediums according to the steel ball ratio. The method is utilized to process the collophanite, the content of below 0.074mm grade can be improved, and the content of 0.074-0.038mm, which is in an easily-choosing grade, is improved. The ore grinding products obtained by the method have reasonability in grain fineness distribution, and the grading index in the following grading operation can be effectively improved.

The invention relates to a beneficiation process for treating high-sulfur hematite-magnetic iron ore mixture. In the beneficiation process, treatment of raw ores with an iron grade being 25 -27 percent and a sulfur grade being 0.4-0.percent comprises the following step of obtaining a 58-62 percent primary overflow product with the overflow particle size being -0.074mm. The beneficiation process ischaracterized in that secondary closed circuit grinding is performed on the overflow product to obtain a product with the particle size being -0.3mm, coarse and fine particle classification is performed on the product with the particle size being -0.3mm with a high frequency fine screen II to obtain a coarse product with the particle size being 0.3-0.074mm and a fine product with the particle size being -0.074mm, beneficiation is performed on the coarse product with operation of low-intermediate intensity magnetic separation, gravity separation, low intensity magnetic separation, middling closed circuit regrinding and reverse flotation, beneficiation is performed on the fine product with operation of low-high intensity magnetic separation, middling closed circuit regrinding and reverse flotation, and iron concentrates with an iron grade being 66 percent or above and a sulfur grade being 0.1 percent or below are obtained. The beneficiation process has the advantages that technical indexes are qualified, and the economic benefit is remarkable.

Provided is a roller for a mung bean huller capable of evenly stirring, shovelling and screening materials in real time. The roller comprises a roller body, one end of the roller body is arranged on a rack bearing pedestal, the other end of the roller body is arranged on a rack mounting seat, the roller body can rotate around the axial center of the roller body, a mesh screen is arranged on the surface of the roller body, the inner wall of the roller body stretches out of a shovelling plate, and a hulling grinding wheel is arranged in the axial center of the roller body. The roller is characterized in that round holes or long round holes are formed in the mesh screen of the surface of the roller body, the shovelling plate on the inner wall of the roller body is divided into a plurality of sets in the circumferential direction at intervals, and three pieces form one set and are evenly distributed on the inner wall of the circumferential roller body at intervals. The round holes or the long round holes are adopted as mesh screen holes of the roller, completely-hulled whole mung beans or half mung beans can be screened conveniently, the built-in shovelling plate bodies are evenly distributed on the circumference of the roller, the materials are stirred and shoveled in the work process, relative displacement can be generated between the materials and the roller, and small-size materials are easier to screen. The whole device guarantees the milled rice rate and improves equipment production efficiency.

The invention discloses a full-automatic chain saw sharpener comprising a chain sharpening device and a chain feeder for feeding a chain. The chain feeder feeds the chain in such a manner: a cutting edge of a blade, to be sharpened, of the chain is fed to a sharpening position from front to back with the blade edges of the chain as references. The full-automatic chain saw sharpener further comprises a controller; the controller is used for coordinately controlling powers and sharpening settings required by actions of the chain sharping device and the chain feeder. The invention further discloses an auto-feed chain saw sharpening method; with the blade edges of the chain as references, the chain is fed from front to rear. The existing rear-to-front chain feeding manner is replaced with the front-to-rear chain feeding manner, thus chances of over-sharpening or failure of sharpening in the chain saw sharpening process are greatly slimmed; meanwhile, the actions are provided with distributed powers and a control board, and the sharpening process is precise and stable.

The invention relates to the field of beneficiation, and particularly provides a spodumene ore flotation collecting agent, a preparation method thereof and a beneficiation process of clay mineralizedspodumene ore. The spodumene ore flotation collecting agent comprises sodium oleate, gallic acid, tartaric acid, oxalic acid and lignin of specific content. The beneficiation process of the clay mineralized spodumene ore is mainly used for solving the problems of serious argillization and poor floatability caused by clay mineral materialization of spodumene ore, the spodumene ore flotation collecting agent is selected, a full-open-circuit process of independent scrubbing, regrinding and reconcentration of middlings is adopted for beneficiation, excessive accumulation of secondary mud caused bya conventional closed-loop process can be effectively avoided, adverse effects like overlarge agent dosage, high pulp viscosity and poor agent selectivity are alleviated, meanwhile, middling grindingand washing operation can be enhanced, and the defect that coarse grains are difficult to float is overcome, so that the grade of concentrate Li2O is improved, and lithium-containing minerals are fully recycled.

A processing and utilizing method for extracting carbon and iron from blast furnace metallurgy dust and sludge belongs to the technical field of mineral processing. The method is characterized by including the steps that metallurgy dust and sludge containing polyacrylamide flocculant is processed, the metallurgy dust and sludge is graded through a hydrocyclone, coarse fraction products are ground and returned to grading operation, fine fraction products are subjected to once roughing and once fine selection through a horizontal centrifugal separator, and iron ore concentrate for metallurgy is obtained through filtering and dehydration operation. Ore pulp of tailing products of the horizontal centrifugal separator is processed through ultrasonic wave and dispersed by adding sodium hexametaphosphate, selective flocculant caustic starch is added, carbon is selected in a floatation mode under the effect of diesel and an n-amyl alcohol compound collecting agent, and carbon concentrate can be obtained through operation of once roughing, twice fine selection and once scavenging. The tailing products selected in the floatation mode are used as the final tailing products. The processing method for utilizing secondary resources of the blast furnace metallurgy dust and sludge containing the flocculant efficiently is provided and has important practical significance on cleaner production, recycling economy and energy saving and emission reduction in iron and steel industry.