449 results about "Magnetite" patented technology

The invention relates to the technical field of data analysis, in particular to a multi-source data-based concealed vanadium titano-magnetite bed target area delineation method and system, which comprehensively considers various factors possibly influencing drilling, such as geological condition complexity and drill bit wear risk, and has relatively low potential risks in various aspects of trajectory selection. The probability of unexpected conditions such as drill bit damage and borehole wall collapse in the drilling process can be effectively reduced, smooth drilling work is guaranteed, the drilling effect abnormity prediction result and the difficulty abnormity reflect the advantages and disadvantages of the drilling track from different angles, and the drilling efficiency is improved. The drilling effect anomaly prediction considers the influence of various abnormal conditions possibly occurring in the drilling process on the final drilling result, the difficulty anomaly focuses on the drilling difficulty of the trajectory, the two are fused and analyzed, the feasibility and the risk degree of each trajectory are evaluated more comprehensively and accurately, and the prediction accuracy is improved. And the influence degree of the track drilling process on ore deposit target area detection is reduced.

The invention belongs to the technical field of magnetite beneficiation, and particularly relates to a method for removing iron impurities in minerals through manual and automatic three-stage combination in magnet beneficiation, a three-stage iron removal system is arranged, the iron impurities and ferromanganese are detected step by step according to the size of the iron impurities and the property of magnets or ferromanganese, and a detected magnetic field is cooperatively calibrated step by step; and iron impurities in the ores are removed in a classified manner. Compared with the prior art, the system has the beneficial effects that a manual and automatic three-stage combined iron removal solution is adopted, large magnetic iron impurities, small magnetic iron impurities and ferromanganese impurities in the process are efficiently classified and removed in a targeted manner, damage of the iron impurities to equipment such as an ore crusher and a belt conveyor is avoided, the operation efficiency of the process is improved, and the production cost is reduced. And the problem of removing iron impurities in magnet beneficiation is solved.

The invention relates to the technical field of jigging magnetic flotation columns, and discloses a jigging magnetic flotation column which comprises an inner cylinder, a magnet exciting coil is fixedly connected to the periphery of the inner cylinder, and an outer cylinder is arranged on the periphery of the magnet exciting coil; a conical concentrator is fixedly connected to the bottom of the inner cylinder, and a pulsation mechanism is arranged on one side of the conical concentrator; and the inner cylinder is connected with a feeding mechanism. The technical problems that a large amount of washing water needs to be used for elutriating the magnetic separator, and the concentration of reagents is affected by adding water into a flotation column are solved, the magnetic separation method for magnetite by applying magnetic levitation is possible, the magnetic separation magnetic field intensity is synchronously and reversely adjusted, and the problems of overflow tailing black running and magnetic ore concentrate magnetic inclusion caused by jigging pulsation are solved; the accidents that the ore pulp of the flotation column runs out of the groove and overflows and the elutriation magnetic separator runs out of the groove and overflows are prevented, and the product recovery rate and the concentrate index are also improved.

The invention provides a method for enriching vanadium and titanium slag through hydrogen-based shaft furnace hydrogen-rich gas reduction-electric furnace melt separation regulation and control of vanadium titano-magnetite. According to the method, the metallization rate of metallized pellets is larger than or equal to 90% and the residual carbon content is 1t through H2-rich reduction (high H2 concentration and staged temperature control); 0.5%; caO and MgO are added in the melting and grading stage to regulate and control slag phase composition, and high-grade vanadium-titanium slag with TiO2 larger than or equal to 45% and V2O5 larger than or equal to 2.3% and low-carbon molten iron are obtained. The high-efficiency separation and carbon footprint of iron, vanadium and titanium in the vanadium titano-magnetite is reduced by more than 50% compared with a traditional process, high-quality raw materials are provided for titanium dioxide and vanadium extraction, and the method has the advantages of high efficiency, cleanness and low consumption.

The invention discloses a preparation method for separating iron, vanadium and titanium in vanadium titano-magnetite by a wet method, belongs to the technical field of chemical metallurgy, and particularly adopts the technologies of hydrochloric acid ore dissolution, solid-liquid separation, iron powder reduction, freezing crystallization, extraction and the like to gradually separate and obtain titanium, iron and titanium products. By means of the method, the ore dissolving efficiency can be effectively improved, the technological process is shortened, traditional vanadium precipitation wastewater and treatment cost are avoided, titanium, iron and vanadium can be effectively separated and recycled, and value maximization of the South African vanadium titano-magnetite is effectively achieved.

The invention discloses an automatic medium adding method for a medium library of a coal preparation plant, a storage medium and electronic equipment, and the method comprises the steps: obtaining the medium library information of the medium library, and calculating the volume of a to-be-added concentrated medium, the mass of to-be-added magnetite powder and the volume of to-be-added clear water according to the medium library information; inputting the medium library information into a preset medium library digital twin model to obtain key information of the medium library; according to the coordinates of the highest point of the medium pile, a model prediction control algorithm is adopted to generate an optimal traveling track, and the traveling crane is controlled according to the real-time coordinates of the traveling crane, the traveling speed and the optimal traveling track; according to the mass of the magnetite powder to be added, the coordinates of the grab bucket, the opening and closing state of the grab bucket and the mass cumulant of the grabbed materials, direct medium discharging and / or differential medium discharging are / is executed; and if the medium placing in-place signal is received, a clean water pump and a blower device are controlled according to the volume of the clean water to be added. According to the invention, automatic medium adding of the coal preparation plant is realized, and control precision and efficiency are improved.

The system is formed by combining and connecting a coarse crusher (1), an ore washing sieve (2), a large dry magnetic separator (3), a wet magnetic separation preselector (4), a fine crusher (5), a dry magnetic separation scavenging machine (6), an aggregate screening machine (7), a preselected concentrate dewatering sieve (8), a preselected tailing dewatering sieve (9), a preselected concentrate concentration magnetic separator (10) and a preselected concentrate filter (11). An ore discharge port of the coarse crusher (1) is connected with a feeding end at the upper part of the ore washing sieve (2), an oversize discharge port of the ore washing sieve (2) is connected with a feeding belt of the large dry magnetic separator (3), and an undersize discharge port of the ore washing sieve (2) is connected with an ore feed port of the wet magnetic preselector (4). Slurry on the surface of high-silt-content raw ore is washed off through screening and ore washing operation, and the ore blocking condition is reduced; dry separation and wet separation processes are combined, a large number of tailings are thrown out in advance, meanwhile, various building material products are produced, and the resource utilization rate is increased.

The invention relates to the technical field of ore particle screening, and discloses high-recovery-rate micro-fine-particle magnetite ore dressing equipment which comprises a mounting frame, a protective shell is fixedly mounted on the mounting frame, a screening assembly is arranged on the protective shell, and the screening assembly comprises a three-way pipe. In order to enable the high-recovery-rate micro-fine-particle magnetic iron ore preparation equipment to be suitable for efficient separation of high-added-value micro-fine-particle iron ore, the screening assembly is arranged, the screening assembly is matched with a power motor to drive a large belt wheel through a small belt wheel and a transmission belt, an output shaft drives an auger rod to push ore in a three-way pipe, feeding blockage is avoided, and the high-recovery-rate micro-fine-particle magnetic iron ore preparation equipment is suitable for efficient separation of high-added-value micro-fine-particle iron ore. And meanwhile, a centrifugal motor drives a trilateral frame to drive a centrifugal screen drum to rotate at a high speed, fine particles fall into a discharging hopper through screen holes by utilizing centrifugal force, and coarse particles are discharged from a first discharging pipe through a mounting drum. And the stirring paddle rotates synchronously to prevent the fine particles from accumulating in the funnel.

The invention provides a copper slag self-pulverization iron extraction method and application thereof.The copper slag self-pulverization iron extraction method comprises the steps that copper slag and a calcium oxide-based additive are mixed to obtain mixed copper slag, the calcium oxide-based additive comprises calcium oxide and / or a calcium oxide raw material, the calcium oxide raw material can generate calcium oxide through heating, and the calcium oxide raw material can generate calcium oxide through heating; the adding amount of the calcium oxide-based additive meets the condition that the total mass of the primary calcium oxide and / or the generated calcium oxide is 29%-47% of the mass of fayalite in the copper slag; after the mixed copper slag is heated to 1250-1700 DEG C, heat preservation is conducted for 30-120 min, and modified copper slag is obtained; slowly cooling the modified copper slag at a cooling rate of 0.25-1 DEG C / min to obtain self-pulverization copper slag; and magnetic separation is performed on the self-pulverization copper slag, magnetite is recycled, and the technical problems of tedious production line and high energy consumption caused by the fact that procedures such as crushing and ore grinding cannot be avoided in the common technology are ingeniously solved.

The invention provides a method for extracting iron through copper slag sedimentation and application thereof.The method for extracting iron through copper slag sedimentation comprises the steps that copper slag and a calcium oxide-based additive are mixed to obtain mixed copper slag, the calcium oxide-based additive comprises calcium oxide and / or a calcium oxide raw material, the calcium oxide raw material can generate calcium oxide through heating, and the calcium oxide-based additive is added into the mixed copper slag; the adding amount of the calcium oxide-based additive meets the condition that the total mass of the primary calcium oxide and / or the generated calcium oxide is 29%-47% of the mass of the fayalite phase in the copper slag; the mixed copper slag is heated to 1200-1800 DEG C for ore phase reconstruction, and modified copper slag is obtained; and after the modified copper slag is crystallized and settled for 10-20 hours under the condition of heat preservation, mother liquor is collected, and an iron concentrated solution is obtained. According to the method, magnetite in the copper slag can be purified and recycled through devitrification and sedimentation, the process is simplified, and energy consumption and mineral separation pollution in the crushing and ore grinding process in the common technology are effectively avoided.

The invention discloses an iron ore cold-bonded pellet, a raw material for the pellet and a preparation method of the pellet, and belongs to the technical field of cold-bonded pellet preparation. According to the iron ore cold-bonded pellet, pellet raw materials comprise mineral components, Na2O.nSiO2 and CaCl2, the mineral components comprise, by mass, 45-65 parts of sintering return mine and 35-55 parts of magnetite concentrate, and the addition amount of Na2O.nSiO2 and the addition amount of CaCl2 account for (4-5)% and (4-5)% of the total amount of the mineral components respectively. According to the preparation method, the magnetite concentrate and the sintering return mine are compounded, and Na2O.nSiO2 is used as an adhesive, so that the strength of the obtained cold-bonded pellets can be effectively improved; meanwhile, by adding CaCl2, sodium ions of Na2O.nSiO2 can be replaced, and the situation that the content of alkali metal in the pellets is too high is prevented.

The invention discloses a magnetic suspension combined beneficiation method for micro-fine particle low-grade refractory magnetite, which comprises the following steps: first-stage ore grinding, first-stage grading and low-intensity magnetic separation are carried out, the obtained first-stage low-intensity magnetic separation concentrate is subjected to second-stage pre-grading, second-stage ore grinding, low-intensity magnetic separation and magnetic separation column I separation, and the obtained magnetic separation column I concentrate is subjected to reverse flotation operation; one-time roughing, one-time scavenging and three-time concentration are adopted in reverse flotation operation, products in a groove after third-time concentration are final iron ore concentrate, tailings of a magnetic separation column I and flotation scavenging tailings are fed into a magnetic separation column II to be subjected to three-section pre-classification, three-section ore grinding, low-intensity magnetic separation and separation, and the tailings of the third-section low-intensity magnetic separation, the tailings of the first-section low-intensity magnetic separation and the tailings of the second-section low-intensity magnetic separation are mixed to be final tailings. The final tailings are used as an iron correcting agent for producing the iron-containing Portland cement. The method has the advantages of being high in iron ore concentrate grade, small in flotation feeding amount, high in flotation feeding grade, stable in index, easy and convenient to produce and maintain, high in adaptability and the like.

The invention discloses a method, a system and equipment for calculating a three-dimensional form of an iron ore body. The method comprises the following steps: acquiring magnetic anomaly data and a magnetic anomaly region of a known hidden magnetite body in a target region; the first top surface burial depth of the magnetite body is calculated or obtained through drilling data based on the magnetic anomaly area, and magnetization intensity three-dimensional distribution of the magnetic anomaly area is obtained; delineating a magnetic body range smaller than preset magnetization intensity according to the first top surface burial depth of the magnetite body and the magnetization intensity three-dimensional distribution; calculating the second top surface depth of the iron ore body according to the preset magnetization intensity, and counting the minimum value of the difference between the second top surface depth and the first top surface burial depth; and extracting a magnetization intensity distribution range which is greater than the inversion of the minimum value of the depth difference in the magnetization intensity inversion result, and calculating the form numerical value of the iron ore body according to the magnetization intensity distribution range.

The invention relates to a preparation method of a multi-layer composite pellet and the pellet. The preparation method comprises the following steps: mixing hematite powder, pellet return ore powder, boric sludge powder and dolomite powder to prepare pretreated hematite powder; uniformly mixing magnetite powder and bentonite to obtain a mixture; pelletizing the mixed material; spraying atomized water and conveying the pretreated hematite powder into the pelletizer to prepare green pellets; and the green pellets are dried, preheated and roasted to produce finished pellets, and screened unqualified products are made into pellet return ore powder to return to participate in batching again. According to the method, the purpose of producing the high-quality pellets with the hematite as the main raw material is achieved, the problem that in the pellet production process, due to the fact that the proportion of the hematite is too high, the pellet index becomes poor is solved, the pellet melting dripping performance is greatly improved, and the technical problem that magnetite concentrate is mainly used for pellet production is solved; and secondary resources such as pellet return charge and boric sludge are fully utilized, so that the production cost of the pellets is reduced.

The invention belongs to the field of metallurgy, and particularly relates to a method for comprehensively recovering iron, vanadium, titanium, scandium and gallium through cooperation of vanadium titano-magnetite and red mud, which comprises the following steps: a) mixing vanadium titano-magnetite concentrate powder and red mud powder, roasting, leaching in water, and carrying out solid-liquid separation to obtain leached residues and leached liquid; b) mixing the leachate with a precipitant to precipitate vanadium, and carrying out solid-liquid separation to obtain vanadium-rich slag and vanadium-precipitated clear liquid; dissolving the vanadium-rich slag in a sulfuric acid solution, mixing the vanadium-rich slag with ammonium salt to react, carrying out solid-liquid separation, and roasting the obtained solid product ammonium polyvanadate to obtain V2O5; resin is used for adsorbing and desorbing gallium ions in the vanadium precipitation clear liquid, the pH of desorption liquid is adjusted to be alkaline, then electrolysis is conducted, and crude gallium is obtained; c) washing and drying the leaching residues to prepare pellets; after the pellets are pre-reduced, a carbonaceous reducing agent is mixed, melt separation treatment is carried out, and scandium-containing high-titanium slag and molten iron are obtained; and Ti and Sc in the scandium-containing high titanium slag are recycled. The method has the advantages of simple process, cleanness, high efficiency and the like.

The invention belongs to the technical field of ultra-lean magnetite crushing and beneficiation, and particularly provides an ultra-lean magnetite final powdering process combining a high-pressure roller mill with two-stage dry separation, which comprises the following specific steps: ultra-fine crushing, screening, first-stage dry magnetic separation and second-stage dry magnetic separation, and the ores return to the high-pressure roller mill to be crushed, the first to fourth steps are repeated, and the waste rocks are directly thrown out. According to the process, the secondary dry type magnetic separation process is added in the follow-up process of the screening process, oversize ore is subjected to secondary dry type magnetic separation and then returns to the high-pressure roller mill, the treatment principle that throwing can be carried out early, throwing can be carried out early, and collecting can be carried out early is achieved, waste rock and part of ore reaching the monomer dissociation degree are separated in advance, and the treatment capacity of the high-pressure roller mill is reduced; therefore, the problem that the treatment effect of the high-pressure roller mill final powder process on the ultra-lean magnetite is poor due to the fact that the disseminated particle size of the magnetite is not uniform is solved.

A method for comprehensive treatment of high-iron and low-silicon red mud through alkali magnetization roasting belongs to the technical field of metallurgy and comprises the following steps: (1) mixing the high-iron and low-silicon red mud, liquid caustic soda and a solid reducing agent, and granulating to obtain raw material pellets; (2) the raw material pellets are dried through kiln tail gas to remove adsorbed water and part of crystal water, and dried pellets are obtained; (3) the dried pellets are subjected to reduction roasting in an inert protective gas atmosphere in a dry roasting mode, and clinker pellets are obtained; and (4) the clinker pellets and a dilute alkali solution are subjected to wet grinding leaching and the like. According to the method, the high-iron and low-silicon red mud is supplemented with liquid caustic soda and solid reducing agents such as coal or sawdust organic matter and roasted, directional regulation and control of a red mud mineral phase are achieved, iron and aluminum resources are recycled in the form of magnetite and sodium aluminate, and the using amount of the reducing agents and the reaction temperature are remarkably reduced.

The invention discloses a sulfur-containing magnetite beneficiation method which specifically comprises the following steps: S1, raw material preparation: crushing sulfur-containing magnetite to obtain small-particle sulfur-containing magnetite; s2, physicochemical property determination: detecting the particle size of the small-particle sulfur-containing magnetite, the content of magnetite in the small-particle sulfur-containing magnetite and the content of sulfur minerals in the small-particle sulfur-containing magnetite; s3, magnetic separation: according to the physicochemical properties of the small-particle sulfur-containing magnetite detected in the step S2, automatically controlling the magnetic field intensity of a magnetic separation process through a controller, and carrying out magnetic separation to obtain magnetite and sulfur-containing ore; the magnetic field intensity of the magnetic separation process is dynamically adjusted according to the iron ore particle size of the sulfur-containing magnetite, the magnetite content in the sulfur-containing magnetite and the sulfur mineral content, the trends of iron minerals and sulfur minerals are accurately controlled, optimal adjustment of the element trends is achieved, and the recovery rate of iron and sulfur is increased.

According to the method, blast furnace return ore and limonite type laterite-nickel ore are used for stirring, important parts such as a trough front grid plate and a small ore trough grid plate are densified, hematite and magnetite are used in cooperation in low-alkalinity sintered ore production, and sintering and blast furnace positive coping adjustment operation modes and other modes are adopted, so that the defects of limonite type laterite-nickel ore sintered ore are overcome; on the basis of not influencing the quality and the yield of the sintered ore, the limonite type laterite-nickel ore is applied to the production of the sintered ore, and the monovalent advantage of the laterite-nickel ore and the benefits of the Ni element to part of steel types are fully utilized.

The invention discloses a method for enhancing biological leaching of copper in a waste circuit board by utilizing magnetite. The method comprises the following steps: adding the pre-crushed waste circuit board and magnetite into a 9K culture medium with the pH value of 1.8-2.0 according to a certain mass ratio, inoculating Acidithiobacillus ferrooxidans as a leaching strain, and carrying out a leaching reaction under a constant-temperature oscillation condition. The magnetite is added, so that the leaching of copper in the circuit board is remarkably enhanced, the leaching rate is remarkably improved, and the leaching period is shortened. And compared with the microbiological leaching result without magnetite, the copper leaching rate is improved by 12-32%. By utilizing the difference between the circuit board and the magnetite in particle size, the magnetite can be recycled from the leaching residues through a physical separation means for a new round of leaching. The method is simple in process, the strain is easy to culture, and the method has good environmental friendliness and is suitable for green and efficient recovery of copper in the waste circuit board.

The invention discloses a Mars soil simulant performance evaluation method based on spectrum-mechanics combined characterization, which comprises the following steps: acquiring surface soil chemical components and physical and mechanical reference data of a target Mars area, taking basalt, magnetite and hematite as raw materials, solving the optimal mass ratio by adopting an optimization algorithm, and preparing a sample. Then, systematic spectrum characterization is carried out on the sample, and components and spectrum characteristic data of the sample are obtained; and meanwhile, carrying out physical and mechanical property test on the sample to obtain mechanical property data. Further, spectrum and component data serve as independent variables, mechanical data serve as dependent variables, an associated data set is constructed, the influence weight is analyzed, and a component-structure-performance quantitative relation is established. And finally, based on all the data and the internal association thereof, calculating the comprehensive similarity between the simulant and the real Mars soil, and generating a comprehensive performance evaluation report. According to the method, multi-dimensional and standardized quantitative evaluation of chemical, mineral and mechanical properties of the Mars soil simulants is realized.

The invention relates to the technical field of ferrous metallurgy, in particular to an evaluation method of a process for deep reduction smelting of vanadium titano-magnetite metallized pellets in an electric furnace, the slag iron quality and the process are graded through the recovery rate of valuable elements, meanwhile, the economic score of the process is calculated through the components and temperature of molten iron, the calculation is simple, and the method is easy to implement. The evaluation indexes are simple and rapid, the quality level of melt separation slag and vanadium-containing molten iron obtained after deep reduction of the vanadium titano-magnetite metallized pellet electric furnace, the technical level of the deep reduction technology and the economical efficiency level of the technology can be clearly and objectively evaluated, and a user can comprehensively evaluate the technical level and the economical efficiency of the technology. And a certain item can be evaluated independently, and the method can be used flexibly according to actual conditions. The evaluation method comprehensively considers the influence of factors such as carbon, sulfur, phosphorus, vanadium and temperature of the molten iron, can more comprehensively and objectively evaluate the deep reduction melt vanadium-containing molten iron, and has good innovativeness and practicability.

The invention provides an oblique coil electromagnetic classificator for separating weak magnetic impurities from strong magnetic concentrate, which comprises a separation cylinder, an ore feeding device and a flushing device, an ore feeding pipe of the ore feeding device extends into the separation cylinder from the top end of the separation cylinder, the flushing device is arranged below the ore feeding pipe, and an oblique coil is arranged on the outer side of the separation cylinder, so that the weak magnetic impurities can be separated from the strong magnetic concentrate. Magnetic lines of force are obliquely distributed, magnetic linkages formed by magnetic particles are oblique, the whole magnetic linkages can be efficiently impacted in cooperation with vertical component force Fz of water flow of the flushing device, and scattering of magnetic aggregates is facilitated; the tail control flat coil and the concentrate gathering flat coil at the upper end and the lower end effectively control tailings and concentrates respectively, so that the separation efficiency of strong magnetic concentrates and weak magnetic impurities is improved, for example, in the iron-titanium separation operation of vanadium titano-magnetite ore dressing, ilmenite mixed into iron ore concentrates can be reduced, the grade of the iron ore concentrates can be improved, and titanium metal resources can be fully recycled.

The invention belongs to the technical field of drying, separating and upgrading of coal particles, and particularly relates to a drying, separating and upgrading system for viscous and wet fine coal. Comprising the following steps: vibrating a gas-solid separation fluidized bed, and setting a pulse airflow process of the vibrating gas-solid separation fluidized bed according to physical property parameters of viscous and wet fine coal by taking hot-state magnetite powder as a separation medium; the vibration gas-solid separation fluidized bed is connected with a parameter real-time control system, a pressure sensor monitors density fluctuation of gas-solid suspensions in the vibration gas-solid separation fluidized bed and collision acting force of particles in a bed layer, and the magnetite powder medium bed layer forms a uniform fluidization state under the synergistic effect of pulse airflow and periodic simple harmonic vibration. The drying dehydration and the separation de-ashing of the viscous and wet fine coal in the separation medium are realized, and the quality improvement of the viscous and wet fine coal is realized. The hot magnetite powder is adopted as a separation medium, a suspension fluidization environment suitable for fine coal separation is formed under the action of vibration and pulsating airflow, and drying, separation and quality improvement of the viscous and wet fine coal are achieved.

The invention discloses a method for comprehensively recovering valuable metals in high-iron bonded copper oxide ore, and belongs to the technical field of resource recovery. According to the method, the high-iron bonded copper oxide ore is subjected to precise ore phase conversion, so that limonite in the high-iron bonded copper oxide ore is converted into magnetite. In the ore phase conversion process, pores and cracks are generated on the surface of the high-iron bonded copper oxide mineral, and grain boundary dislocation occurs between iron minerals and copper minerals, so that release of the bonded copper minerals is promoted; the ore phase conversion product is subjected to mechanical activation, selective enhanced leaching and solid-liquid separation, and iron-rich leaching residues and copper-rich leaching liquid are prepared; and the iron-rich leaching residues are further subjected to low-intensity magnetic separation, and efficient recovery of iron ore concentrate is easily achieved. According to the method, the iron ore concentrate and the copper-rich leachate are finally obtained, and efficient comprehensive recovery of iron and copper valuable metals in the high-iron combined copper oxide ore is achieved.

The invention discloses a technical method of a lean magnetite dry-discarded tailing recleaning recovery process, and relates to the technical field of iron ore recovery. The technical method of the lean magnetite dry-discarded tailing recleaning and recycling process is characterized by comprising the following specific operations: S1, stacking coarse tailings at one place; s2, adding the coarse tailings obtained in the step S1 into a vertical shaft crusher; s3, the materials obtained in the step S2 are added into a double-layer efficient fine powder sieve, then the materials with the particle size being 0-6 mm serve as stone powder to be subjected to the step S4, the materials with the particle size being 6-16 mm serve as melon seed slices to be subjected to the step S5, the materials with the particle size being larger than 30 mm serve as medium four stones to be subjected to the step S6, and if other materials exist, the materials with the particle size being larger than 30 mm serve as medium four stones to be subjected to the step S6. According to the lean magnetite dry-discarded tailing recleaning and recycling process technical method, existing coarse tailing (0-30 mm) building material products are subdivided, and the standard of mainstream building material products in the market is met; and fine-fraction (0-6 mm) fine ore resources in the coarse tailings are subjected to re-separation and recovery, so that the metal loss is reduced, and the metal recovery rate is increased.

The invention discloses an all-component comprehensive utilization method for limonite type laterite-nickel ore, and belongs to the technical field of mineral processing and metallurgy. According to the method, multi-stage preheating and selective reduction are combined, accurate regulation and control of ore phase conversion are achieved by optimizing temperature and atmosphere conditions, metallic nickel and cobalt generated through reduction form a stable complex in the ammonia leaching process, and magnetite serves as an indissolvable magnetic phase to be left in slag. The reaction temperature is effectively reduced, the energy consumption is reduced, and the gas-solid mass transfer efficiency and the heat transfer efficiency are remarkably improved. The mineral structure is regulated and controlled through selective reduction, the adverse effects of excessive reduction, sintering, follow-up leaching difficulty and the like of iron oxide in the high-temperature roasting process of a traditional rotary kiln are avoided, and efficient selective leaching of nickel and cobalt and recovery and enrichment of magnetic iron ore are achieved. And meanwhile, the nickel and cobalt leaching efficiency is remarkably improved, interference of iron impurities on a leaching solution is reduced, and an economical and feasible new technical path is provided for resource comprehensive utilization and green metallurgy development of the limonite type laterite-nickel ore.

The utility model discloses a pair of inclined nose pliers convenient for collecting scrap iron, which comprises a pliers body, a lantern ring is fixedly connected to the outer side of the pliers body, a pin shaft is rotatably connected to the inner side of the lantern ring, and a pliers handle is fixedly connected to one side, far away from the pliers body, of the lantern ring. According to the device, by arranging the collecting assembly, when the hands of an operator are relaxed, under the elastic action of an extension spring, a connecting block drives a fixing sleeve to reset through a movable rod, so that the pincer body is kept in an open state, the operator can conveniently keep the pincer body open without additional force after completing one-time shearing, and preparation work of next-time shearing operation is conveniently conducted; and when the magnet is close to an area where the scrap iron is generated. The iron scraps can be attracted to the outer cover on the outer side of the magnet under the magnetic effect of the magnet, the containing groove is formed in the wall of the outer cover, and when the outer cover retracts into the hollow rod, the iron scraps can be conveyed into the containing groove, so that the iron scraps can be better gathered on the outer side of the outer cover.

To improve reducibility of an iron ore raw material to be used in an operation of a blast furnace and to further reduce a ratio of reducing materials in the blast furnace.SOLUTION: The present invention relates to a method for determining a charging area of iron ore raw material when charging the iron ore raw material and coke into the furnace. A relation between two different temperatures, Tlow and Thigh (where Thigh>Tlow) as a reduction temperature to magnetite when the iron ore raw material is reduced to magnetite and the time required for the magnetite in the iron ore raw material to reach a predetermined reduction rate due to a reduction rate when the magnetite in the iron ore raw material is reduced to metallic iron, is determined in advance; and a charging area for the iron ore raw material in the furnace is determined using the relation.SELECTED DRAWING: Figure 2

The invention discloses a sefstromite grinding and selecting method which comprises the following steps: performing coarse grinding and selecting on a sefstromite raw material to separate out fine-grained ilmenite and coarse grinding and selecting weak magnetic concentrate; carrying out spiral-flow type grading on the coarse grinding and separation weak magnetic concentrate, carrying out fine grinding on a sand setting product obtained by spiral-flow type grading, and carrying out spiral-flow type grading on an obtained ore discharging product again; an overflow product obtained through spiral-flow type grading is graded through a high-frequency screen, and an oversize product of the high-frequency screen is subjected to superfine grinding; mixing the ore grinding product obtained by superfine grinding with the undersize product of the high-frequency sieve, and performing primary separation to obtain primary separation section weak magnetic concentrate and primary separation section weak magnetic tailings; and elutriating the weak magnetic concentrate in the primary separation section to obtain the vanadium-titanium-iron concentrate. According to the vanadium-titanium-iron ore grinding separation method, the cost of the vanadium-titanium-iron ore concentrate purification process can be reduced, the product quality of the vanadium-titanium-iron ore concentrate is improved, and efficient recovery of the vanadium-titanium-iron ore concentrate is achieved.