239results about How to "Reduce grinding energy consumption" patented technology

The invention discloses a silicate cement grinding aid and a preparation method thereof. The silicate cement grinding aid is prepared from the following main raw materials by weight: 3-6 parts of sodium hexametaphosphate, 2-5 parts of aluminum sulfate, 5-8 parts of tetra sodium salt of amino trimethylene phosphonic acid (ATMP.Na4), 4-6 parts of ethylene diamine tetra (methylene phosphonic acid) sodium, 38-45 parts of polymeric alkylol amine, 34-42 parts of triisopropanolamine, 8-12 parts of waste engine oil, 2-5 parts of sodium alpha-olefin sulfonate, 10-16 parts of sorbitol, 15-20 parts of diethylene glycol, 8-13 parts of polypropylene wax, 6-10 parts of oxidized polyethlene wax, 4-8 parts of lignite wax, 20-30 parts of odium thiosulfate, 12-18 parts of sodium thiosulfate and 15-20 parts of quicklime powder. The prepared silicate cement grinding aid has the advantages that the quality is stable, the effect is remarkable, the adding amount is small, the use is simple, and the adding is more convenient and reliable to control.

The invention discloses a beneficiation method of rare earth ore. The beneficiation method comprises the steps that crude ore is subjected to crushing and ore grinding till the crude ore with the fineness being -0.076 mm accounting for 50% or above, low intensity magnetic separation is carried out to remove strongly magnetic minerals, then superconducting magnetic separation rougher flotation is carried out to obtain rare earth rough concentrates, the rare earth rough concentrates are ground till the rare earth rough concentrates with the fineness being -0.076 mm accounting for 80% or above, conventional flotation work is carried out, and final rare earth ore concentrates are obtained; conventional flotation work includes the processes of one-section rougher flotation, two-section concentration and two-section scavenging; according to low intensity magnetic separation, the magnetic field intensity ranges from 0.1 T to 0.5 T, and the magnetic field force is (3-15)*10<5>kA<2>/m<2>; and according to superconducting magnetic separation, the magnetic field intensity is larger than 0.5 T, and the magnetic field force is larger than 3*10<7>kA<2>/m<2>. According to the method, the high-grade rare earth rough concentrates can be obtained through superconducting magnetic separation, a large quantity of tailings can be thrown out, the grading efficiency is high, the two-section ball grinding ore feeding quantity is greatly reduced, grinding and selecting energy consumption is reduced, the rare earth grade of the obtained rare earth ore concentrates is improved, and the recovery rate is high.

The invention relates to a method for refining iron and removing phosphorus from complex refractory high-phosphorus iron ore, in particular to a method for sorting high-phosphorus iron ore by combining microwave reduction roasting and low intensity magnetic separation, and belongs to the technical field of mineral processing, particularly iron ore beneficiation. The method comprises the following steps: crushing refractory high-phosphorus iron ore used as raw material into granules with granularity of less than 2mm; mixing the crushed raw ore with a fluxing agent and a reducing agent in a certain proportion; transferring the obtained mixed material into a microwave reaction furnace for reduction roasting; and carrying out water-quenching, cooling, ball-milling and wet-magnetic-separating on the obtained roasted ore to finally obtain iron ore concentrate. In the method, the ore is reduced by utilizing a microwave roasting technology, wherein microwave reduction roasting time is short, and the temperature of the ore is raised quickly; and meanwhile the fluxing agent is added so as to promote gangue softening and improve refractory ore structure together with microwave roasting reaction. By utilizing the method for sorting the high-phosphorus iron ore, the iron ore concentrate with grade of more than 58.39% can be obtained, and phosphorus removal rate reaches over 70.44%, thus a new technique is provided for sorting the high-phosphorus iron ore.

The invention provides high-bending-strength supersulfate cement and a preparation method thereof and relates to the field of building materials. The high-bending-strength supersulfate cement comprises granulated blast-furnace slag, gypsum and high-belite sulfate aluminum cement clinker. By utilizing the high-bending-strength supersulfate cement, the problem that existing supersulfate cement is low in hydration and hardening speed and early strength and prone to sand shedding caused by the fact that excitants cannot fully excite granulation blast-furnace slag activity in the prior art is solved, and bending strength of the cement is improved greatly; the high-bending-strength supersulfate cement has the advantages of high early-later strength and is ultrahigh in bending strength especially.

The invention relates to a flotation method, in particular to a flotation method for improving the flotation recovery rate of a target mineral in a complex ore. The method comprises the following steps: grinding a target mineral in a raw ore until the target mineral is basically dissociated; producing a concentrate 1 and a tailing 1 through roughing one or twice, cleaning twice or three times, as well as scavenging three to ten times; combining a bottom product of the concentrate 1 and all scavenged foam products to form a middling; concentrating and grinding; returning the grinded ore pulp to a flotation process through an independent sequence to obtain a concentrate 2 and a tailing 2; and combining the concentrate 1 and the concentrate 2 to obtain a final concentrate. According to the flotation method in the invention, the grinding energy consumption can be effectively reduced, partial target mineral with low floating speed is recovered, and the flotation recovery rate of the target mineral is improved by 5 to 20 percent.

The invention discloses an iron oxide ore joint beneficiation process, which comprises the following steps: (1) dry selection and discarding of iron oxide ore to obtain pre-selected coarse-grained ore, pre-selected fine-grained ore and waste rock; (2) high-pressure Roller mill crushing: the pre-selected coarse-grained ore obtained in step (1) is fed into a high-pressure roller mill for crushing; (3) dry grinding: the crushed product in step (2) and the pre-selected fine-grained ore in step (1) Combined for dry closed-circuit grinding; (4) Fluidized reduction roasting: a. Put the ground product obtained in step (3) into the fluidized reduction roaster; b. Preheating; c. Heating; d. Magnetization roasting; e . Cool to below 200°C to obtain roasted ore with a magnetite content greater than 90%; (5) beneficiation of roasted ore to obtain iron concentrate products with a grade of 57%-65%. The present invention can effectively solve the current iron oxide ore beneficiation There are technical problems such as low resource utilization rate, poor concentrate quality and high energy consumption in the process.

The invention relates to a size-fractionated pre-selection tailing discarding process of extremely-poor hematite. The process comprises a step of carrying out semi-autogenous grinding to obtain semi-autogenous grinding discharge ore with a particle size of 14-0mm. The process is characterized by screening; carrying out coarse grain pre-selection I; carrying out coarse grain pre-selection II; carrying out first-section closed-circuit grinding; carrying out coarse grain pre-selection operation III; and carrying out second-section closed-circuit grinding. A three-layer linear vibrating screen isadopted for screening. In four products, the product with a size fraction of-14 mm to 10 mm is returned to semi-autogenous grinding. The coarse grain pre-selection I and the coarse grain pre-selectionII are used for pre-selecting a -10mm-6mm size fraction and a -6mm-2mm size fraction. Coarse-grain tailings are thrown out, coarse-grain concentrates are combined and fed into first-section closed-circuit ore grinding, a first-section closed-circuit ore grinding product and the screened -2 mm size fraction are fed into coarse-grain pre-selection operation III for pre-selection tailing discarding,coarse-grain pre-selection operation III concentrates are fed into second-section closed-circuit ore grinding, and second-section closed-circuit ore grinding overflow is fed into subsequent sorting operation. The process has advantages that discharge ore is divided into narrow grades for respective pre-selection; qualified coarse grain tailings are thrown out; and a problem of stubborn stone accumulation is solved, and a processing capacity of a semi-autogenous mill is improved.

The invention provides a method for treating refractory red iron ore based on staged combined magnetizing roasting. The method comprises the following steps of (1) crushed refractory red iron ore rawore is screened and classified, and the crushed refractory red iron ore raw ore is divided into a powder ore material and a lump ore material; (2) dry powder preparation is carried out on the powder ore material, a fine grain powder ore material is obtained, flash magnetizing roasting of the fine grain powder ore material is carried out, and a powder ore roasting ore is obtained; and magnetizing roasting is carried out on the lump ore material by adopting a vertical furnace or a rotary kiln, and a lump ore roasting ore is obtained; (3) the lump ore roasting ore is carried out pre-selection tailing, so that lump ore tailing rough concentrate ore is obtained, and tailing ore is directly thrown away; and (4), the lump ore tailing rough concentrate ore is carried out a primary grinding and classifying operation, and a primary classifying overflow product is obtained; and the primary classifying overflow product and the lump ore roasting ore are combined to enter a sorting process, a finaliron ore concentrate product is obtained, and the tailing is directly thrown away. The method for treating refractory red iron ore based on staged combined magnetizing roasting has the advantages of being simple in process, stable in control, energy-saving and environment-friendly, high in adaptability, and good in beneficiation product quality.

The invention discloses a high-voltage electric pulse pretreatment method for intensifying the leaching of difficult-to-treat gold ore, and belongs to the technical field of the processing of minerals of gold ore. According to the method, the high-voltage electric pulse crushing pretreatment is realized by utilizing the differences of the dielectric properties of different minerals in ore; a high-voltage electric pulse discharge crushing device is used for carrying out selective crushing on gold-containing ore; gold and a gangue mineral in a gold-containing material are prompted to generate a micro crack and a running crack at an interface; a crystal of a gold-containing mineral is completely dissociated into monomer mineral particles; in this way, the exposed surface area of the gold is increased; therefore, the contact probability of cyanide and a gold grain is increased, so that the sufficient improvement of the leaching rate of the gold is facilitated.

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 discloses an active excitatory grinding aid for ferronickel slag and a preparation method for the active excitatory grinding aid. The grinding aid is composed of polymeric glycol, cocoanut fatty acid diethanolamide, sodium pyrophosphate, ethyl acetate, an excitant and water, wherein the excitant is composed of calcined alunite, water glass and sodium abietate. The additive amount of the grinding aid in the ferronickel slag is 0.02-0.10% by mass of the ferronickel slag. The active excitatory grinding aid disclosed by the invention is sufficient in raw materials, simple to process and prepare, low in doping amount, stable in performance and high in cost performance. As the ferronickel slag which is ground is added, the problem that the ferronickel slag is poor in grindability can be solved. Under the condition that the grinding time is equal, the specific surface area of the ferronickel slag micropowder can be improved by 4.5-9%, the mill output is increased by over 15%, the energy consumption is remarkably reduced, and moreover, the active index of the ferronickel slag can be further improved by 10-35%.

The invention discloses a method for producing calcium fluoraluminate clinker through aluminum cell carbon waste. The method comprises the following steps of 1, securing treatment, wherein crushing is performed, a detoxicating agent solution is sprayed in an atomization mode to obtain a granulated detoxicating material; 2, fuel treatment, wherein a catalytic oxidant is added, and homogenizing modification is performed to obtain fluorine-containing fuel; or the catalytic oxidant, lime and water are added to be stirred or rolled and mixed or pulverized through a wet process or filtered or filtered and washed to obtain dealkalized fluorine-carbon residue fluorine-containing fuel; 3, manufacturing a raw material, wherein waste alumina, calcium raw materials and waste gypsum are prepared, grinding and homogenizing are performed, and plastifying molding is performed; 4, manufacturing the clinker, wherein the material is fed into a tunnel kiln or a vertical kiln to be calcinated and quenched to obtain the clinker. The clinker obtained through the method can be supplied to dual high early strength cement production, and has the good economical efficiency and good performance; the method can utilize a large quantity of aluminum silicon and calcium containing waste; the method is safe, simple, large in handling capacity, low in energy consumption, low in cost, free of secondary pollution and suitable for industrial production.

The invention relates to a cement outer-circulating semi-finish grinding system of a vertical mill. The cement outer-circulating semi-finish grinding system comprises a belt conveyor, a magnetic separator, a metal detector, a three-way valve, the vertical mill, a bucket elevator, a powder concentrator, a dust collector, an air blower, a tube grinder and a chute, wherein the vertical mill is an outer-circulating vertical mill, and no powder concentrator is arranged in the outer-circulating vertical mill; the powder concentrator is formed by connecting a coarse powder V-shaped powder concentrator and a fine powder concentrator in series, and fine powder obtained from the coarse powder V-shaped powder concentrator enters the fine powder concentrator for concentration again; the fine powder obtained from the fine powder concentrator is served as a cement product A and collected through the dust collector and the air blower, and separated coarse powder is divided into two ways, wherein one way enters the tube grinder, and one way returns to the vertical mill for circulating grinding; and the powder which enters the tube grinder is ground into a cement product B by the tube grinder. The cement outer-circulating semi-finish grinding system disclosed by the invention achieves relatively high grinding efficiency by sufficiently exerting the high-efficiency crushing and grinding functions of the vertical mill and the high-efficiency grinding function of the tube grinder on the fine powder, thereby reducing the grinding energy consumption.

The invention relates to a direct and reverse flotation technique for high-magnesium low-grade phosphorus ore coarse grains. The technique comprises the following steps: crushing and grinding high-magnesium low-grade phosphorus ores; transferring into a flotation machine stirring tank and adding water for mixing slurry; keeping the temperature of the ore slurry at 10-30 DEG C, and then respectively adding regulator sodium silicate and inorganic base into the ore slurry; adding a direct flotation collecting agent for mixing the slurry; adding water for performing direct flotation system operation; transferring a direct flotation foam product into a reverse flotation stirring tank, respectively adding the regulator sodium silicate and reverse flotation mixing collecting agent into the reverse flotation stirring tank, and mixing the slurry without adding fresh water; adding fresh water and performing the reverse flotation system operation; discharging and stacking the foam products which are reverse flotation tailings, wherein the products in the tank are low-magnesium phosphorus ore concentrates; concentrating, filtering and drying, thereby acquiring the end products of concentrates. According to the technique, the last magnesium content of the concentrates is reduced and the quality of the concentrates is increased; the process is simple; the energy consumption for ore grinding is low; the dosage of agents is less; the separation effect is good; the discharging rate of magnesium is high; the water quality of concentrate and tailing is improved.

The invention relates to the technical field of cement additives, particularly a retarding-type cement grinding aid. The retarding-type cement grinding aid is prepared from the following raw materials in parts by weight: 18-28 parts of triethanolamine, 12-24 parts of diethanolisopropanolamine, 2-8 parts of sodium tartrate, 5-17 parts of coco fatty acid diethanol amide, 8-16 parts of sodium gluconate, 6-14 parts of polyaspartic acid and 50-70 parts of water. The retarding-type cement grinding aid has favorable retarding effect, can enhance the early strength and later strength of cement, and is beneficial to enhancing the impermeability and freeze-thaw resistance of hardened concrete.

The invention relates to a washing and direct flotation method of low-grade refractory argillaceous phosphorite, which is characterized by comprising the following steps: a. phosphorite closed coarse crushing, fine crushing, screening, water washing and fine ore closed wet grinding grading; and b. phosphorite rough separation, twice concentrating, once scavenging direct flotation, thickening and pressure filtration direct flotation. The step a is performed to prepare the phosphorus concentrate for yellow phosphorus production, of which the mass percent of P2O5 is greater than or equal to 25% and the particle size is less than or equal to 25mm, and prepare the phosphorite slurry for phosphoric acid production, extraction and slurry preparation without flotation, of which the content of particles with the particle size of 100 meshes is greater than 85% and the mass percent of P2O5 is 28.5%. By adopting the more-crushing/less grinding-closed screening-washing technique, the method can lower the grinding energy consumption by 10kw.h/t, and has the advantages of obvious separating effect between the phosphorite and gangue mineral and favorable separation indexes. Compared with the traditional technique, the phosphorus concentrate recovery rate is enhanced by 10% or so, and the tailing remaining phosphorus is lowered by 2-3%.

The invention relates to a modified cement grinding aid, belonging to the technical field of cement assistants. The modified cement grinding aid is prepared from the following substances in parts by weight: 20-30 parts of polymerized polyalcohol, 10-30 parts of lignin-based alkylol amine, 2-10 parts of sodium soap, 5-10 parts of polytetrafluoroethylene powder, 1-5 parts of solid aluminum dihydrogen phosphate, 1-4 parts of gelatin and 2-6 parts of sucrose. The particle size of the solid aluminum dihydrogen phosphate is 50-80nm. The modified cement grinding aid is beneficial to highly fine milling and superfine grinding, is beneficial to enhancing the yield of the grinder, and enhances the yield of the ball grinder by 25%. The modified cement grinding aid is beneficial to lowering the grinding energy consumption, enhancing the clinker utilization ratio and saving the cost. The clinker powder in the cement can basically complete the hydration reaction within 20 days, thereby completely displaying the strength action. The modified cement grinding aid is beneficial to improving the production of special cement, and is beneficial to energy saving and emission reduction in cement industry.

The invention discloses a beneficiation method for producing blast furnace lump ore by hematite at a medium-high grade. The method comprises the following steps of: crushing the hematite with the iron grade being greater than or equal to 39%, and grading the hematite into materials with two size fractions of 40mm-10mm and -10mm; carrying out dry-type strong magnetic roughing, primary dry-type strong magnetic scavenging and secondary dry-type strong magnetic scavenging on the materials with the size fraction of 4mm-10mm to respectively obtain dry-type strong magnetic roughing ore concentrate, primary dry-type strong magnetic scavenging ore concentrate, secondary dry-type strong magnetic scavenging ore concentrate and lump ore tails, and combining and feeding the dry-type strong magnetic scavenging ore concentrate, the primary dry-type strong magnetic scavenging ore concentrate and the secondary dry-type strong magnetic scavenging ore concentrate to a jigging reselection operation to obtain the blast furnace lump ore; and combining tails in the jigging reselection with the materials with the grade of -10mm into middlings, and feeding the middlings to subsequent grinding and selecting operations for grading. By adopting the method, part qualified blast furnace lump ore can be obtained in advance, the lump tails can be ejected, the goal ore grinding amount (namely the amount of the middlings) can be greatly reduced, and thus the energy consumption for grinding and selection can be greatly reduced.

The invention discloses a method for producing a belite-gypsum material by using sludge and waste gypsum through a dry-process rotary kiln. The method comprises the following steps of (1) melting a sludge ridge grain seed crystal with high water content into modified sludge residues; (2) proportioning raw materials of the modified sludge residues, the waste gypsum and a correcting material according to a certain ratio, and grinding the raw materials by using a vertical mill to form raw material powder; (3) delivering the raw material powder obtained in the step (2) into a dry-process rotary kiln system, and calcining the raw material powder to form clinker; and (4) grinding the obtained clinker to obtain powder with the fineness of 0.08mm and the screen residue content of less than 20%. The method disclosed by the invention is simple, low in investment and cost, free of other secondary pollution and capable of absorbing the sludge and the waste gypsum on a large scale and in a recycling way, greatly reducing the energy consumption and relieving the environment pollution.