80results about How to "Reduce the amount of ore" patented technology

The invention relates to a coarse grain pre-selection and magnetic-floating separation process for mixed ores with embedded micro-fine particles. The coarse grain pre-selection and magnetic-floating separation process is characterized in that a 'half-self-grinding, wet-type pre-selection, continuous ore grinding, weak magnetic-strong magnetic fine screening and re-grinding and strong magnetic reverse flotation' operating system is adopted to sort the mixed ores with embedded micro-fine particles, and iron ore concentrates with grade of 65%-65.5% and yield of 35%-40% are obtained. The coarse grain pre-selection and magnetic-floating separation process has the advantages that 15%-20% large-particle qualified tailings are obtained from the ores through the wet-type pre-selection, the magnetic ores with yield of 15%-20% and grade of higher than 65% can be separated in advance through magnetic-floating separation, the ore feeding amount of separation operation is reduced, the number of flotation machines is decreased, agent using amount is decreased, and ore separation cost is reduced.

The invention relates to a micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process. The micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process is characterized by separating micro-fine disseminated mixed ores through an operating system with semi-autogenous grinding, wet preconcentration, continuous ore grinding, low-intensity and high-intensity magnetic separation, under-size sieve grinding and high-intensity magnetic fine gravitational separation to obtain 65.5-66% of iron ore concentrate at a yield rate of 35-40%. The micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process has the advantages that, by means of a wet semi-autogenous grinding process, crushing operations can be reduced; preconcentrated rough concentrate, after two sections of continuous grinding, can get rid of large-grain gangue and lean locked particles; then by performing separation through a low-intensity magnetic fine sieve regrinding method, qualified-grade concentrate can be obtained and meanwhile feeding capacity of gravitational separation operations can be reduced by 30%. Meanwhile, the micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process is short in process, simple in equipment, easy to operate, free from environmental pollution and capable of saving energy.

The invention discloses an iron improvement and silicon reduction beneficiation method of high ferrosilite and lean magnet iron ore, the method comprises the following processes of crushing-screening,fine crushing, dry-type preconcentration tailings discardinghigh-pressure roller milling, coarse particle magnetic separation, and coarse particle magnetic separation concentrate rough grinding-low intensity magnetic separation, wherein coarse crushing is arranged underground, medium and fine crushing are arranged on the ground, the placement is reasonable and orderly, reducing of occupied spaceis facilitated, and transporting and lifting of ore from the downhole is convenient. The dry-type preconcentration tailings discarding is carried out on sieve residue and through product after intermediate crushing and fine crushing, mixed barren rock is thrown out, throwing out is carried out and rough gangue and block gangue used as building products are recovered in advance, the iron grade of follow-up separating operations is recovered and improved, the ore content given to the follow-up operations is greatly reduced, " receiving early and losing early" is realized. The feeding grain sizeof high-pressure roller milling is up to 30mm, a precedent is broken, characteristics of low energy consumption and high processing capacity of a high-pressure roller milling machine is fully played,a product stock heap is not arranged in design, and occupied space and dust pollution are reduced.

The invention relates to a rare earth ore beneficiation method which is characterized in that grading is carried out after ore grinding is carried out on raw ore; reselection is carried out on coarse fractions to obtain gravity concentrates and tailings; magnetic separation is carried out on fine fractions to obtain strong-magnetic separation concentrates and tailings; reselection is respectively carried out on gravity concentrates and strong-magnetic separation concentrates which are different in fraction through a table to obtain table concentrates, table middlings and table tailings; the table concentrates and the table middlings which are different in fraction are mixed, and wet-type high-gradient magnetic separation is carried out to obtain magnetic separation rare earth ore concentrates and magnetic separation middlings; the magnetic separation middlings and the table tailings are mixed, closed-loop flotation including primary rough concentration, secondary scavenging and secondary fine selection is carried out after ore regrinding is carried out, the middlings are returned in proper sequence, and flotation rare earth ore concentrates and flotation tailings are obtained. The magnetic separation rare earth ore concentrates and the flotation rare earth ore concentrates are total rare earth ore concentrates, the REO grade is higher than 65%, and the total recovery rate ranges from 80% to 87%. The rare earth ore beneficiation method is high in grading efficiency, small in occupied area, continuous in production and low in cost, full-wet dust-free operation is achieved, and industrialization is easy to achieve. The rare earth ore beneficiation method is suitable for beneficiation of light rare earth ore existing in the bastnaesite or parisite mode.

The invention is a method for strengthening the mining of deep opencast pit, and its characteristic: it adopts strip mining method to make strip side expansion from inside to outside, where each strip is 20-60 m wide, retains the rest undigged, adopts a mode of combining vertical digging from top to bottom with horizontal digging, adopts a 2-4 stage combining mode as mining, reduces the number of steps, and increases side slope angle. By adopting strip mining method, it can advance the time of side expansion so as to use the side expansion to remedy the deficiency in the ore productivity in the stope bottom, thus making stable output transition on the deep opencast pit without reducing the output, able to enlarge the size of the stope bottom, creating the conditions of deepening the bottom stope for mine engineering, and reducing stocked ore.

The invention discloses a method for recovering tin by centrifugal concentration, belonging to the technical field of metal ore concentration. The method comprises the following steps of: recovering and enriching a tin resource from a tin-containing ore by using a high-speed centrifugal concentrator together with a shaking table; performing pretreatment or not performing treatment according to the milling characteristic of a tin ore; entering the high-speed centrifugal concentrator for rough gravity concentration; enriching to obtain a tin rough ore concentrate; removing tailings; and selecting the tin rough ore concentrate by using the shaking table to obtain a tin ore concentrate. The method has the advantages of high process specificity, high resource efficiency, remarkable economic benefit, small investment, small floor area and the like.

The invention discloses a mineral separation method for recycling wolframite from a tailing. The mineral separation method comprises the following steps that (1) gravity separation of a centrifugal machine is conducted for tailing discarding and preenrichment; (2) sulphide ore flotation is conducted; (3) magnetic separation is conducted and magnetic impurities are removed; (4) high-gradient magnetic separation is conducted for wolframite enrichment; (5) tabling gravity separation is conducted to obtain coarse grained wolframite; and (6) flotation is conducted to obtain fine grained wolframite. By means of centrifugation gravity separation preenrichment, the separation grade of the wolframite is improved, the ore feeding quantity and the mud content of wolframite separation are reduced, and flotation reagent dosage is saved. By means of the sulphide ore flotation and magnetic separation iron removal, the disturbance of sulphide minerals and magnetic minerals on wolframite separation is reduced. According to the mineral separation characteristics of the wolframite, the separation index of the wolframite is improved by adopting the high-gradient magnetic separation and the coarse grained and fine grained wolframite grading and separation process. Efficient recycling of the wolframite in low-grade wolframite tailing resources is achieved, and the mineral separation method is environmentally friendly, efficient and energy saving, and suitable for application and popularization.

The invention discloses a dense medium beneficiation method for barites. According to the dense medium beneficiation method, dense medium suspension liquid with proper density is prepared according todifferent densities of minerals and is utilized for separating usable minerals and gangue minerals, and two minerals with the density difference equal to or more than 0.2g / cm<3> can be effectively separated. The dense medium beneficiation method has the beneficial effects that low-grade resources can be processed, and the total reserves of the minerals can be increased; and universal and standardauxiliary equipment is adopted in the whole separation process, is low in investment, small in occupied area, easy to operate, low in operation cost and applicable to complete automatic control, so that the economic benefit of mines can be greatly increased.

The invention relates to a method for selecting limonite, which comprises that a, using ball grinder, screw grading machine and high-frequency vibration screen to grind mineral, b, reselecting, roughly selecting, fine selecting, and secondary selecting, c, reversely floating selecting to obtain high-level limonite. The invention utilizes reselection and reverse floating selection, with low cost to be used in the mineral selection industry whose yield is 100000t. And the invention adds a high-frequency vibration screen into traditional ball grinder and screw grading machine to improve the grading efficiency as 30% and adds secondary fine selection to reduce the mud content under 5%, and improve 2-3 degrees of the levels of mineral. And the invention removes mud before reverse floating selection to reduce agent consumption.

The invention provides a mining method for an outdoor quarry. Ore extraction is carried out by adopting a multi-layered explosion manner, so that most of caved ores are successfully thrown to a mucking platform on the lowest layer, few cores are retained on a drilling platform, the disadvantage that secondary transferring of the retained cores is needed in a layered explosion manner is overcome, and the production cost of a mine is greatly reduced; and after explosion, a new multi-layer layered drilling platform is formed synchronously, the safety of subsequent drilling operation and shovel mucking operation is guaranteed, and the potential safety hazards of rolling stones and falling caused by high and steep slopes are also eliminated. Experimental result indicates that after explosion by adopting the mining method for the outdoor quarry provided by the invention, the quantity of cores retained on the drilling platform is reduced by more than 90%.

The invention provides a dressing-metallurgy combination recycling method for solid inclusion copper oxide ore. According to the purpose, strong magnetic separating is adopted for copper oxide ore wrapped by weak magnetic minerals to obtain a magnetic product wrapped by copper oxide, and the magnetic product is filtered, wherein the copper oxide ore is hard to recycle through floatation, and the direct acid leaching rate is low; and microwave drying and heating, heating selectivity of microwaves on different minerals in a solid inclusion is utilized, the temperature rise of the minerals is different, volume expansion is different, so that cracks are generated, ,a diffusion channel is provided for subsequent sulfuric acid leaching, the leaching rate speed and the leaching rate are increased, and copper ore resources hard to treat are efficiently recycled. By means of the dressing-metallurgy combination recycling method for solid inclusion copper oxide ore, dressing and metallurgy methods are in mutual promotion and are in collaboration, and the technical problem about machining and utilizing of solid inclusion copper oxide ore resources is economically and effectively solved.

The invention discloses an efficient environment-friendly type beneficiation method for low-grade magnetic mirror iron ores. The efficient environment-friendly type beneficiation method is characterized in that iron ore concentrate which meets smelting requirements is obtained by adopting processes such as raw material three-stage crushing, large particle medium-magnetism and SLon strong-magnetismpre-selection, one-stage ore grinding and grading, one-stage weak magnetic-selecting and one-stage SLon strong magnetic-selecting, pre-grading and two-stage ore grinding and grading, two-stage weak magnetic-selecting and two-stage SLon strong magnetic-selecting and SL centrifugal machine selecting operation for the magnetic mirror iron ores. The efficient environment-friendly type beneficiation method can throw 21% of coarse-particle barren rocks through high-pressure roller-grinding, large-particle medium-magnetism pre-selecting and SLon strong-magnetism pre-selecting, and meets the beneficiation principle of preferably crushing instead of grinding and throwing as early as possible. A selecting process of roughing, cleaning and scavenging of a centrifugal machine is adopted, so that re-selecting operation completely replaces reverse flotation operation, and therefore, the efficient environment-friendly type beneficiation method is a pollution-free beneficiation method, is high in degree of automation, is great in processing amount, is liable to realize field operation and implementation, and greatly reduces manual operation.

The invention discloses a mineral processing process for oolitic hematite. The mineral processing process comprises the following steps: crushing raw ores into ores with a grain size smaller than 5mm in a crusher, and then, roasting the ores for at least one hour in a fuel gas rotary kiln with a temperature being 500-550 DEG C; grinding the ores until the content of the ores with the grain size smaller than 0.074mm is 34%, and carrying out low intensity magnetic separation on the ores by use of a wet magnetic separator to magnetically separate iron rough concentrate 1 and tailings 1; introducing the iron rough concentrate 1 into a vibrating sieve to sieve, wherein qualified iron concentrate 1 is over the vibrating sieve, and magnetic separation column concentration is firstly carried out under the vibrating sieve; concentrating iron rough concentrate 2 and tailings 2; grinding the iron rough concentrate 2 until the content of the iron rough concentrate 2 with grain size smaller than 0.074mm is 75%, and carrying out secondary magnetic separation column concentration to concentrate iron rough concentrate 3 and middlings 1; and carrying out tertiary magnetic separation column concentration on the iron rough concentrate 3 to concentrate the iron rough concentrate 2 and the tailings 2. The mineral processing process is simple and is low in cost, is environmentally-friendly and is high in return water utilization rate as no chemical is needed to be added.

Disclosed is a smashing device for ore processing and with a function of continuous shaking blanking. The smashing device comprises a shell, a smashing box, a feeding hopper and a hydraulic cylinder. The smashing box is fixedly arranged on the top of the shell, the feeding hopper is communicated to the top of the smashing box, and two smashing rollers which conduct extrusion meshing with each other are installed in the smashing box. A plurality of springs are fixedly arranged on the lower side of the left end of a supporting plate, and a mesh screen is embedded into the corresponding portion, located exactly below a blanking opening, of the supporting plate. A movable extrusion block is arranged on the left side of the top of the supporting plate, a plurality of horizontal upper protrusions are arranged on the lower surface of the movable extrusion block, and a plurality of lower protrusions are arranged on the upper surface of the supporting plate. The movable extrusion block moves under the action of the hydraulic cylinder, the distance between the movable extrusion block and the supporting plate is changed through alternate contact between the protrusions at the bottom, the supporting plate can be shaken, small ore on the mesh screen can be shaken off, only large-particle ore is left, and therefore the quantity of extruded ore is reduced, the equipment load is reduced, and the energy consumption is reduced.

The invention belongs to the technical field of mineral processing engineering and relates to a step-by-step desiliconizing and upgrading method for high-aluminum and high-silicon bauxite. The method comprises the steps that firstly, the high-aluminum and high-silicon bauxite is subjected to rough grinding, slurry mixing is conducted, a spiral chute is adopted to conduct the first step of desiliconizing, and coarse grain bauxite concentrate ores are obtained through roughing and concentrating; secondly, middlings in the first step are combined and reground, slurry mixing is conducted, the second step of desiliconizing is conducted through a hydraulic cyclone and the spiral chute in sequence, specifically, desliming is conducted through the hydraulic cyclone firstly, settled sand of slime is subjected to roughing and concentrating through the spiral chute, and medium grain bauxite concentrate ores are obtained; and thirdly, the middlings and tailings obtained in the first and second steps are combined and subjected to floatation desiliconizing, fine grain bauxite concentrate ores are obtained through a closed floatation process. By means of the step-by-step desiliconizing and upgrading method that the coarse grain ores are enriched in the spiral chute after rough grinding, after the middlings are reground, the medium grain ores are enriched in the hydraulic cyclone united with the spiral chute, and tailing fine slime flotation is conducted to enrich the fine grain ores, the bauxite concentrate ores of different grain grades are obtained by stages, so that the step-by-step desiliconizing and upgrading method has the advantages that drug consumption is low, the recovery rate is high, and desiliconizing is thorough.

The invention discloses a beneficiation method applied to superconduction magnetic separation of a rare earth ore, and aims to solve the technical problems of higher economical loss and resource wastecaused by lower recovery rate of a rare earth resource in a traditional rare earth beneficiation process. The substantial process of the beneficiation method is as follows: firstly, a raw ore of therare earth ore is crushed and grinded; the tailing discarding is performed on the rare earth ore in advance by centrifugal reselection; then, a reselected concentrate is grinded, and a superconductionmagnetic separator is used for superconduction weak magnetic separation to remove high-magnetism mineral impurities; then, superconduction strong magnetic separation is performed to obtain a rare earth rough concentrate; and finally, flotation is performed on the rare earth rough concentrate to obtain a high-grade rare earth concentrate. The beneficiation method greatly improves the sorting precision and efficiency, and reduces consumption of a total flotation medicament and consumption of a water resource through a breakthrough-developed reselection-superconduction magnetic separation-flotation process, so that the energy consumption and the operation cost are reduced, efficient sorting and utilization of the rare earth resource are implemented, and the grade and recovery rate of the rare earth ore are greatly improved.

The invention discloses a micro-fine grained magnetic-hematite mixed iron ore mineral processing method. The micro-fine grained magnetic-hematite mixed iron ore is crushed for primary grinding, the primary grinding product is fed into primary medium magnetic separation-primary high magnetic separation operation, and the primary high magnetic separation tailings T1 are discarded as qualified tailings; the primary medium magnetic separation coarse concentrate and the primary high magnetic separation coarse concentrate are combined for regrinding, the regrinding product is fed into secondary medium magnetic separation-secondary high magnetic separation operation, and the secondary high magnetic separation tailings T2 are discarded as qualified tailings; and the secondary medium magnetic concentrate and secondary high magnetic concentrate are combined and fed into anion reverse flotation operation, and the primary reverse flotation roughing, primary reverse flotation fining and tertiary reverse flotation sweeping are used, and the reagent system is that the sodium hydroxide is used as pH adjuster, the corn starch is used as iron ore depressant, the lime is used as activator, and RA-915is used as a collector. The method has the advantages of low loss of micro-fine grained iron ore, high iron recovery rate, high iron grade and cleanness and environmental protection.

The invention discloses a method for recovering Te minerals from complex Te ore, and belongs to the technical field of mineral process engineering. The reselection-flotation combined method which is low in cost and stable and mature in process is put forward so that the Te minerals can be recovered from the complex Te ore. According to the technical scheme, the method is characterized in that the classification-separation process includes the steps of ore grinding, classification, reselection and flotation; firstly, broken raw ore is ground so that the product with the fineness of -0.074 mm can account for 90% to 92%; after classification is conducted through a water separating machine device, reselecting and tailing are conducted on the part with the fineness of -0.039 mm, and the process of rough flotation, sweeping and triple refined flotation is conducted on the part with the fineness of +0.039 mm. The method is suitable for processing the low-grade and extremely-low-grade complex Te ore with 0.08% to 0.12% of Te so that high-quality Te concentrates with the Te grade of 3.30% to 4.20% and the recovery rate of 85% or higher can be obtained. The method absorbs the advantages of the reselecting and tailing process and the advantages of the flotation process, is simple in process, reasonable in procedure structure, high in adaptability to raw materials, good in separation effect, stable in index and easy to implement industrially.

The invention discloses a beneficiation method for tin-copper paragenetic sulphide ore rich in pyrrhotite. According to the method, the tin-copper paragenetic sulphide ore is subjected to the procedures, namely magnetic separation for impurity removal of the first time, bulk flotation, ore grinding, copper-sulphur separating flotation, sulphur removal separating flotation, magnetic separation for impurity removal of the second time and full cassiterite re-separation, so that high-iron-content sulfur concentrate, copper concentrate, sulfur concentrate and tin rough concentrate are produced and obtained. The tin-copper sulphide ore, high in pyrrhotite content, in raw ore can be comprehensively utilized; impurity interference of main separation metal grading is reduced; grading conditions are improved; the main separation metal recovery rate is increased; a pyrrhotite-high-iron-content sulfur concentrate product high in additional value is obtained; and the beneficiation method is simple, easy to implement and low in production cost.

The invention relates to the technical field of beneficiation, and provides a pre-separation and waste-discarding beneficiation method for low-grade copper sulphide ores. According to the method, low-grade copper sulfide ores are screened into -60+10 mm, -10+6 mm, -6+2 mm, -2+0.15 mm and -0.15 mm ores through crushing and repeated screening, the -0.15 mm ores are regarded as primary slime and aredirectly used as qualified ores, the -2+0.15 mm, -6+2 mm and -10+6 mm ores are subjected to pre-separation and waste discarding through jigging, and the -60+10 mm ores are subjected to pre-separationand waste discarding through intelligent ray ore separation, and the copper grade of the finally obtained qualified ores is 0.27% or above. According to the provided method, pre-separation of the copper sulphide ore and a large amount of barren rock is realized, the copper grade of the selected ores is improved, the amount of ores entering a concentrating mill for grinding and separation is reduced, operation is stable, the cost is low and industrial production is realized easy.

The invention discloses a beneficiation method for strengthened recycling of fine-particle chromite. The beneficiation method comprises the following steps that firstly, magnetic separation is conducted, raw ore is subjected to strong magnetic separation, and strong magnetic separation rough concentrates and strong magnetic separation tailings are obtained; secondly, reselection is conducted, thestrong magnetic separation rough concentrates obtained in the first step are subjected to reselection, and reselection concentrates and reselection tailings are obtained; and thirdly, flotation is conducted, the ore pulp mass concentration of the reselection tailings in the second step is adjusted, a collecting agent and a foaming agent are sequentially added, one-time rough fine selection is conducted, then, the flotation closed-loop process including at least three times of fine selection, at least two times of scavenging and middling sequential return is conducted, and flotation concentrates and flotation tailings are obtained. The magnetic-reselection-flotation combined technology is adopted in the beneficiation method, the fine-fraction chromite can be effectively recycled, comprehensive concentrate reselection is conducted, the final chromite concentrate Cr2O3 grade is 42% or above, the recycling rate is 80%-90%, the chromite resource is effectively recycled, the integral cost islow, and the high technology index can be reached.

The invention provides a complex multi-metal rare earth ore beneficiation separation and enrichment method. The method comprises the following steps of firstly, finely crushing ore, realizing pre-tailing discarding in a spiral mode, and discarding 50% or more of gangue minerals; performing ore grinding flotation on gravity separation rough concentrate to recover rare earth and niobium minerals, and applying strong magnetism to flotation tailings to further recover rare earth and niobium mineral; and finally recovering zirconium concentrate from magnetic separation tailings through gravity separation, wherein the grade of zirconium is 55.025%, and the recovery rate is 51.55%. According to the method, the cost can be saved on, the recovery rates of the rare earth and niobium are increased, the contents of rare earth and niobium in subsequent zirconium concentrate are reduced, and the quality of the zirconium concentrate is improved.

Disclosed is a heavy liquid tailings discarding technics for the lead-zinc concentrator to improve the processing capacity, comprising the steps as follows: 1) according to the density of all kinds of minerals, in particular to the difference between the valuable metals and the waste rock, select the heavy liquid with a specific density between the light mineral and the heavy mineral; 2) crush the processed ores and make the particle size between 0 and 16mm; 3) put the processing ores in the heavy liquid with different specific density; 4) in an experiment of some specific density, take out the ores floated on the surface of the heavy liquid, and filter out the heavy liquid; take out the ores sunk to the bottom of the heavy liquid, and filter out the heavy liquid; 5) analyze the weight of the ores that the density is less and more than the specific density of the heavy liquid and the content of the valuable metals; 6) discard tailings by using the best specific density selected according to the fifth step as the heavy liquid. The invention has the advantages that the quantity of the ores enters the grinding mill is reduced, the cost of the ore grinding is saved, the processed ores quantity of the subsequent separating operation is also reduced, and the heavy liquid can be repeatedly used without environmental pollution.

The invention discloses a spodumene particle-size double-dense-medium-flotation benefication method, and belongs to the technical field of mineral machining. The method adopts two sections of crushingflow; through screening (or classification) treatment, high-density dense medium separation and low-density dense medium separation, thick-particle spodumene concentrate products and fine-particle spodumene concentrate products are obtained; cyclone overflowing products are concentrated for ore grinding; a cyclone is used for mud removal; and sunk sand enters the flotation operation to obtain fine-particle spodumene concentrate products. The method has the advantages of high adaptability, low production cost, capability of obtaining the concentrate products with different particle sizes and reduction of the crushing and ore grinding energy consumption and the medicament use level.

The invention relates to a magnetism-weight-flotation combined technology for separating hematite iron ore containing iron carbonate. The magnetism-weight-flotation combined technology comprises the step that iron ore with the hematite distribution ratio being higher than 40% is fed in to be subjected to first-stage closed circuit grinding operation. The magnetism-weight-flotation combined technology is characterized in that the magnetism-weight-flotation combined technology further comprises the steps of first-stage weak magnet and strong magnet operation, thickness grading operation, gravityseparation operation, secondary staged ore grinding operation, second-stage weak magnet and strong magnet operation and reverse floatation operation; the first-stage weak magnet and strong magnet operation treats a primary grading overflow product and a middling ore re-grinding product; the thickness grading operation treats first-stage weak magnet and strong magnet mixed concentrate; the gravityseparation operation treats a coarse particle product after the thickness grading operation; the secondary staged ore grinding operation treats gravity separation operation tailings; the second-stageweak magnet and strong magnet operation treats a fine grain product after the thickness grading operation; the reverse floatation operation treats second-stage weak magnet and strong magnet mixed concentrate; and centrifuge separation operation treats middling ore after the reverse floatation operation. The magnetism-weight-flotation combined technology has the advantages that the middling circulation volume is reduced, a process flow is simplifies, and the manufacturing cost is reduced.

The invention belongs to the mixed ore screening technology field and especially relates to a franklinite screening process, and the process comprises a zinc ore concentrate screening process and an iron ore concentrate screening process, screening sequences of two useful minerals are that the zinc ore concentrate is firstly screened and the iron ore concentrate is magnetically screened. Through the screening process, the qualified zinc ore concentrate and the qualified iron ore concentrate are effectively recycled, the useful mineral is high in recycling ratio, energy is saved and the production cost is reduced.

The invention belongs to the technical field of mineral separation, and particularly discloses a dolomite-barite type lead zinc ore separation flotation method. The method comprises the steps: crushing dolomite-barite type lead zinc ore to screen out ore with the particle size being-20 + 2 mm, then feeding oversize fraction minerals after ore washing into a dense medium cyclone to be separated to obtain heavy products and light products; respectively draining the medium from the heavy product and the light product to obtain oversize products which are heavy minerals and light minerals; and carrying out coarse grinding and flotation on the heavy minerals to obtain sulphide ore flotation concentrate and non-sulphide ore, wherein the sulphide ore flotation concentrate is the mineral containing galena, sphalerite and pyrite, and the non-sulphide ore is the mineral containing barite. The method provided by the invention can realize separation of coarse-grained dolomite and sulphide ore, and fundamentally solves the problems that the dolomite is easy to be over-ground and argillized to cause foam stickiness, lead and zinc indexes are influenced and the like; and separation of sulfide ore and barite can be realized under the condition of relatively coarse granularity, so that a basis is provided for subsequent reselection and recovery of the barite.

The invention relates to a crushing, screening and washing process of high-mud and high-water surface mixed hematite. The crushing, screening and washing process comprises the steps of performing three crushing processes including coarse crushing, intermediate crushing and fine crushing on mixed hematite of which the iron grade is 30% to 35%, the slime content is 20% to 40% and the granularity is0 to 750 mm in a raw ore stock bin, wherein in the coarse crushing process, a roller type screening machine and a double-geared roller crusher are adopted to screen to deslime and crush, and then a rotary drum washer and a drum screen are adopted to wash to deslime and perform dry and wet separation; in the intermediate crushing process, an intermediate crushing cone crusher and a dry double-layervibrating screen closed loop are adopted to treat oversize products of the drum screen, and undersize products of the drum screen are treated by a two-stage wet single-layer vibrating screen, a cyclone unit and a dewatering screen so as to obtain selected pulp; and in the fine crushing process, a fine cone crusher and a linear vibrating screen are adopted to obtain feed raw materials. According to the crushing, screening and washing process, the problems of adhesion and blockage of minerals are effectively solved, and the energy consumption is greatly reduced.

The invention discloses a process for recovering black mica and white mica from iron ore dressing tailings, and relates to the technical field of ore processing. The process comprises the following steps that low-intensity magnetic separation tailings after ore grinding are sorted by using a vertical ring magnetic separator, and mica-containing tailings are separated from iron minerals; the mica-containing tailings are pumped into a hydrocyclone to be graded, fine silt is obtained, then the fine silt is fed into the hydrocyclone for overflowing removal, and hydrocyclone settled sand is obtained; the hydrocyclone settled sand is fed into a spiral chute, and spiral chute tailings and spiral chute concentrates are obtained; the spiral chute concentrates are fed into an ore feeding box and flow into a desliming hopper from the ore feeding box, overflow of the desliming hopper enter total tailings, and underflow of the desliming hopper enter a stirring tank before flotation; a pH regulator, an inhibitor and a trapping agent are added into the stirring tank, the pH value of the material in the stirring tank is detected in real time until the pH value in the stirring tank reaches 11, and then, primary roughing is conducted on the material in the stirring tank. The process has the advantages that better flotation indexes can be obtained, and the flotation effect is improved.

The invention relates to a mineral separation method for an alkaline rock type rare earth mineral, which is characterized in that the mineral separation method comprises the following steps of: carrying out mineral grinding and magnetic separation to obtain magnetic separation roughing concentrates and magnetic separation roughing tailings; carrying out magnetic separation scavenging on the magnetic separation roughing tailings by using a high-gradient wet process to obtain magnetic separation scavenging concentrates and magnetic separation scavenging tailings; and combining the magnetic separation roughing concentrates with the magnetic separation scavenging concentrates, carrying out closed-route flotation of rough concentration for one time, scavenging for three times and fine concentration for three times after mineral grinding and sequentially returning middlings. Finally, flotation fluorine carbon cerium concentrates and flotation tailings are obtained. The mineral separation method has the advantages of simple and short process, small equipment floor area, no dust operation, normal temperature operation and high sorting index. The mineral separation method is suitable for the mineral separation of a light rare earth mineral existing in a bastnaesite form.