100 results about "Limonite" patented technology

The invention discloses a beneficiation method of refractory iron ore with symbiotic hematite, limonite and siderite, which comprises the following steps of: crushing weakly magnetic refractory iron ore to below 100mm in a closed circuit, then sequentially carrying out three times of dry screening to obtain four particle fractions of 0-6mm, 6-15mm, 15-40mm and 40-100mm, pre-selecting the particle fractions of 6-15mm by adopting a dry high-intensity magnetic separator, pre-selecting the particle fractions of 15-40mm by adopting a chunk jigger, pre-selecting the particle fractions of 40-100mm by adopting a photoelectric intelligent separator, and pre-selecting the particle fractions of 40-100mm by adopting a high-intensity magnetic separator; photoelectric intelligent pre-selected concentrate is crushed to 0-40 mm through a fine crushing closed circuit, then jigging pre-selected concentrate is combined, then the photoelectric intelligent pre-selected concentrate is crushed to 0-6 mm through an ultra-fine crushing closed circuit, an ultra-fine crushing product is combined with the 0-6 mm fraction, then wet type strong magnetic pre-selection is conducted through a coarse grain wet type strong magnetic separator, the pre-selected concentrate is subjected to ore grinding-fine grain wet type strong magnetic one-coarse one-scavenging one-coarse one-scavenging one-fine one-scavenging reverse flotation, and the final concentrate is obtained. And final concentrate is obtained. The invention has the advantages of large raw ore selection granularity, large tailing discarding amount, low energy consumption, good separation effect and the like.

The invention provides a combined beneficiation method for laterite-nickel ore, which comprises the following steps: separating chromite in the laterite-nickel ore through a combined process of one-stage cyclone separation, spiral chute, multi-stage table classification, multiple low-intensity magnetic separation and multiple spiral classification to obtain first chromium concentrate, chromium middling, low-intensity magnetic separation middling and mixed light mineral aggregate; the chromium in the limonite and the chromite subjected to leakage treatment in the mixed light mineral aggregate, the low-intensity magnetic separation middling and the high-intensity magnetic separation magnetic substance is further enriched and separated by combining a combined process of subsequent multiple ball milling, two-stage rotational flow, low-intensity magnetic separation and high-intensity magnetic separation, so that more second chromium concentrate is screened out, the content of the chromium in the subsequent high-pressure leaching stock solution is reduced, and the yield of the high-pressure leaching stock solution is improved. The comprehensive utilization of the chromium element is realized.

The invention provides a gold ore phase analysis method, and belongs to the field of mineral analys.The gold ore phase analysis method comprises the steps that a gold ore sample is prepared into ore pulp, the pH value is adjusted to 10-11, ultrasonic cavitation treatment is conducted after polyethylene glycol is added, and limonite turbid liquid and sedimentation bottom mud are obtained through separation; the turbid liquid is subjected to flocculation precipitation, drying, roasting, acid dissolution and impurity removal, and the limonite gold-loaded grade is obtained through the mass difference before and after dissolution and gold concentration determination; separating metal sulfide ore heavy minerals and gangue minerals from the settled bottom mud through artificial heavy elutriation, performing acid dissolution and impurity removal on the metal sulfide heavy minerals, and calculating the gold loading grade of the metal sulfide heavy minerals through mass difference and gold concentration determination; after gangue minerals are subjected to oxidizing roasting, the gold content is measured after concentrated acid dissolution; and calculating the distribution rate of gold based on the result. The gold loading grade and distribution of the limonite phase, the metal sulfide ore phase and the gangue mineral phase are measured in a split-phase mode, the method is highly matched with the gold ore development process, operation is easy and convenient, the result is reliable, and beneficiation and metallurgy technological process formulation and technical index pre-judgment can be effectively served.

The invention discloses a high-aluminum limonite and specularite ore blending and sintering method which comprises the following steps: 1) preparing primary pre-blending powder: pre-blending high-aluminum limonite, specularite concentrate powder, iron oxide scale, limestone powder and anthracite powder to prepare the primary pre-blending powder with the water content of 6.5-7%; (2) preparing a uniformly mixed material: blending the primary pre-blended material powder obtained in the step (1) with high-silicon iron ore powder and hematite and limonite powder to prepare the uniformly mixed material; 3) sintering and burdening: burdening the uniformly mixed material obtained in the step 2) with limestone, dolomite powder, quicklime, solid fuel and return mine, and 4) controlling the components of the sintered ore as follows: 2.3-2.5% of Al2O3, 5.7-6.5% of SiO2, 8-8.5% of FeO and 1.85-2.5% of MgO. According to the invention, while 20-30% of the proportion of the discount ore silk road powder in the total uniformly mixed material is increased, the sintering cost is reduced by 20-42 yuan / ton, the drum strength of the sintered ore is greater than or equal to 78.5%, the return mine rate is less than or equal to 27%, and the RDI + 3.15 mm is greater than or equal to 63%.

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 preparation method of high-silicon high-hematite limonite pellets, and belongs to the field of blast furnace burden, and the preparation method specifically comprises the following steps: step A, carrying out primary batching, drying and wet grinding on concentrate powder, Kara concentrate powder, Brazil concentrate powder, laterite-nickel ore, red mud iron powder and boron-magnesium concentrate powder in proportion; step B, proportionally adding bentonite into the wet-ground material in the step A, and carrying out secondary batching; step C, conveying the materials in the step B into a vertical mixer for strong mixing; step D, conveying the mixed material to a pelletizing chamber for pelletizing; and E, the green pellets are conveyed to a roasting cooling system to be prepared into finished pellets. According to the pellet prepared through the method, the adding amount of bentonite is reduced, the cost is reduced, the compressive strength of the finished pellet can reach 2500N / P or above, the green pellet drop strength, the compressive strength and the dry pellet compressive strength are far higher than those of on-site pellets, and the production requirement can be met.

The invention discloses a dry grinding, automatic grading and thermochemical activation method for coarse ore powder, which comprises the following steps: 1) mixing limonite and specularite according to a ratio of 7: 3, and carrying out dry grinding to form embedded novel fine grinding iron ore powder; 2) dynamically drying for more than 28 seconds through a thermal medium at 450-550 DEG C to remove 1.5-6.5% of crystal water from materials entering a mill, promoting conversion of 10-30% of limonite phase into hematite, reducing the heat sensitivity and burning loss of the hematite, and improving the roasting performance of the pellets; (3) through dynamic drying-vertical roller milling integrated pretreatment, the surface activity and the surface energy of the coarse iron ore powder are improved under the action of a thermal medium and mechanical force; and (4) finished fine ground iron powder collected by the cloth bag powder collector is conveyed to a finished product bin for storage through a closed chute and a bucket elevator, is metered by a sealed belt weigher, is humidified by a humidifier and then enters an M1 belt to participate in pellet batching. According to the method, the adding proportion of specularite and limonite powder in pellet production is greatly increased, the wide caliber of pellet raw materials is achieved, and the raw material production cost of pellet ore is reduced.

The invention discloses a production method for producing low-alkalinity fluxed pellets from whole hematite limonite, which comprises the following steps: taking flue gas treatment by-product desulfurized fly ash and carbon-containing dedusting ash, feeding into a first batching bin, blanking according to a first preset proportion, feeding into a powerful mixer, mixing, and rolling at high pressure to obtain a first mixture; performing dry grinding or wet grinding on the hematite and limonite coarse powder to obtain hematite and limonite fine powder; the first mixture, hematite and limonite fine powder and bentonite are blanked according to a second preset proportion, and a second mixture is obtained; carrying out strong mixing and high-pressure roller milling on the second mixture, and pelletizing to form green pellets; and the green pellets sequentially enter a forced air drying section, an air draft drying section, a preheating section and a roasting section of a belt type roasting machine, and finally the all-hematite limonite low-alkalinity fluxed pellets are obtained. The method has the advantages that the pulverization phenomenon caused by the low bursting temperature of the drying section can be eradicated, the quality of green pellets is improved in the drying section, conditions are provided for liquid phase generation in the preheating and roasting sections, and the compressive strength of pellets is remarkably improved.

The invention discloses a coal gas injection method in a limonite sintering process, which comprises the following steps of: integrally imaging a sintering charge level according to a thermal imager above the charge level of a sintering machine to obtain the predicted temperature of the charge level, and dividing the charge level into a preheating area, a low-temperature reaction area, a medium-temperature reaction area, a high-temperature sintering area and a cooling area according to the predicted temperature of the charge level; blowing coal gas and mist water drops to the preheating area, the low-temperature reaction area, the medium-temperature reaction area, the high-temperature sintering area and the cooling area according to the coal gas injection amount and pressure and the mist water drop injection amount and pressure of the corresponding areas, and sintering; local overheating or supercooling can be avoided, and the sintering quality is powerfully guaranteed; the gas permeability of a material layer can be optimized through partitioned injection of water vapor, gas circulation and reaction development are facilitated, according to different sintering stages, coal gas and fog drop water are injected at a certain flow rate and pressure, various working conditions can be well adapted, solid fuel consumption in the sintering process is reduced, and the sintered ore yield is increased.

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 belongs to the field of seawater desalination, and particularly relates to a seawater desalination water conditioning system and a conditioning method. The desalinated seawater conditioning system comprises carbon dioxide adding equipment and conditioning and filtering equipment. The carbon dioxide adding equipment is used for dissolving carbon dioxide in the seawater desalination water to realize accurate adding of the carbon dioxide, and the conditioning and filtering equipment is used for performing conditioning treatment on the seawater desalination water dissolved with the carbon dioxide and comprises a conditioning filter; the tempering filter sequentially comprises a quartz sand filling layer and a natural mineralized material filling layer from bottom to top. The natural mineralization material comprises zeolite and calcined limonite, and the mass ratio of the zeolite to the limonite is (1: 3)-(1: 5). In the desalinated sea water conditioning system, the conditioning filter equipment has higher impact load resistance, the natural mineralized material filling layer is easy to backwash, the backwash water consumption can be reduced, the conditioning filter equipment has a good conditioning effect, and the desalinated sea water subjected to conditioning treatment can reach the national drinking water standard.

The invention discloses a device and a method for sintering and grinding limonite into pellet fine powder and removing crystal water, the device comprises a vertical mill, tuyere rings are arranged around a millstone of the vertical mill, a powder concentrator is arranged above the millstone, a blanking hopper is arranged on the lower side of the powder concentrator, a blanking pipe is arranged in the center of the blanking hopper, and the vertical mill is provided with a coarse powder outlet and a returned material inlet. The blanking hopper is connected with a coarse powder transfer device through a coarse powder outlet, the coarse powder transfer device is connected with an air inlet of the roasting furnace, an air outlet of the roasting furnace is connected with a flue gas inlet, a discharge port of the roasting furnace is connected with a return material inlet through a roasting return material device, and the return material inlet is connected with a blanking pipe. According to the method, the limonite sintering powder with the large particle size is ground into the pellet fine powder through the vertical grinding machine, free water in the limonite sintering powder is removed while the pellet fine powder is ground, part or even all of crystal water in the limonite can be removed with the high heat utilization rate, and the yield of the pellet fine powder is improved. And the adverse effect caused by crystal water release in the pellet roasting process is reduced.

The present invention discloses a method for strengthening the sintering of limonite-type laterite nickel ore. The sintering raw materials including limonite-type laterite nickel ore, iron concentrate, fuel, flux and return fines are successively mixed, granulated and sintered to obtain limonite-type laterite nickel ore sinter. By adjusting the aluminum content of the sintering mixture within an appropriate range, this method can reduce the liquid phase formation temperature, increase the liquid phase formation amount, improve the ore-forming conditions of the sinter, and enhance the strength of the limonite-type laterite nickel ore sinter. Moreover, this method reduces costs, has simple operation and strong practicability, and has obvious economic benefits.

The invention provides a method for producing alkaline magnesian pellets and the alkaline magnesian pellets. The method comprises the steps that S1, limonite powder and dolomite powder are continuously blended according to a preset proportion to form a pre-blended mixture, and the pre-blended mixture is continuously fed into a dry method vertical roller mill; s2, extruding, shearing and grinding the pre-prepared mixture in a dry-method vertical roller mill, and meanwhile, introducing high-temperature separation flue gas to perform winnowing on the ground material to obtain single mixed powder; s3, directly adding water into the single mixed powder, mixing and pelletizing to obtain green pellets; and S4, the green pellets are fed into a chain grate-rotary kiln system to be roasted, and the alkaline magnesian pellets are obtained. The problems that in the production process of producing the alkaline magnesium pellets from the limonite powder and the dolomite powder, the number of raw material processing procedures is large, energy consumption is high, and mixing is insufficient are effectively solved. And the effects of improving the pellet quality, saving energy, reducing consumption and reducing carbon emission are achieved.

The invention discloses a sintering agglomeration method of limonite. The sintering agglomeration method comprises the following steps: adding the limonite which accounts for 50-65% of an iron-containing material; the addition amount of the solid fuel is 5.2-8.7% of that of the sintered material; the solid fuel is divided into two parts, one part is used during batching, and the other part is used during granulation; during sintering, the thickness of a material layer is 850-1100 mm; the ignition temperature is 1000 to 1100 DEG C; the negative pressure is 3-7 kpa; the ignition time is 2-5 minutes; the air draft negative pressure is 14 to 18 kpa; according to the method, the solid fuels with different granularities are added in the burdening and pelletizing processes respectively, and the content of the limonite is increased by controlling the water content of the sintered material, the ore return amount, the alkalinity and the component content of the sintered ore, the thickness of the sintered material layer and the ignition process parameters and the air draft negative pressure in the sintering process.

The present application belongs to the technical field of sinter production, and particularly relates to a production method of ultra-high basicity sinter for improving converter slagging, dephosphorization and reducing in-furnace spattering, which comprises the following steps: mixing 65% limonite powder, 20% magnetite powder and 15% blast furnace return fines, proportionally mixing 64% sintered mixture, 30% flux, 6% coke powder and 10% sintered internal return to prepare sintered mixed material, mixing and granulating under mist water according to a ratio of 7:3, and sintering under the condition that the thickness of the material layer is controlled to be 850 mm. The composition of the obtained ultra-high basicity sinter is as follows: CaO: 20% to 25%; SiO2: 5.5% to 6.6%; TFe: greater than or equal to 45%; basicity: 3.2 to 3.5; and drum strength: greater than or equal to 68. The micro-phase composition of the ultra-high basicity sinter is as follows: calcium ferrite: greater than or equal to 35%; dicalcium ferrite: 15% to 20%; dicalcium silicate: 10% to 20%; and iron oxide: less than or equal to 25%.

The invention belongs to the field of refractory materials, and provides a light heat-insulating refractory brick and a preparation method thereof. The light heat-insulating refractory brick comprises particles, mixed powder and an additional binding agent, the particles comprise, by weight, 10-15 parts of expanded vermiculite and 30-45 parts of closed cell perlite, and the mixed powder comprises, by weight, 15-25 parts of spherical quartz powder and 5-15 parts of perlite dust collecting powder. The raw materials comprise, by weight, 5-10 parts of waste silica brick powder, 5-10 parts of siliceous pyrophyllite powder, 10-15 parts of Jiaozhou white clay, 5-15 parts of sodium montmorillonite powder and 5-15 parts of limonite powder; the additional binding agent comprises the following raw materials in parts by weight: 3-5 parts of binding slurry and 3-5 parts of pre-gelatinized starch. The refractory brick disclosed by the invention is a light heat-insulating refractory brick which is small in volume density, small in heat conductivity coefficient and capable of meeting the requirement of heat insulation in a high-temperature kiln at 900-1000 DEG C in normal-temperature compressive strength.

The invention relates to a silica ore dressing method which comprises the following steps: step 1, crushing raw ore of silica ore, step 2, grinding the crushed silica ore by adopting a ball mill, step 3, carrying out graded desliming treatment on the ground silica ore by using a hydrocyclone, step 4, carrying out weak magnetic separation on the deslimed silica ore, and step 5, carrying out magnetic separation on the deslimed silica ore. And 5, the non-magnetic material subjected to weak magnetic separation is subjected to strong magnetic separation, and silica concentrate is obtained. Before the ore is subjected to strong magnetic separation, strong magnetic minerals are removed through weak magnetic pre-separation, the strong magnetic separator is effectively prevented from being blocked, the operation stability and the production continuity of equipment are improved, various magnetic impurity minerals including intergrowth particles can be removed to the maximum extent through the whole technological process, and the production efficiency is improved. Such as hematite, limonite, biotite, ilmenite, pyrite and garnet.

The present invention provides a combined beneficiation method for laterite nickel ore. The method comprises the following steps: a first cyclone separation, a spiral chute, a multi-stage shaking table classification, a plurality of weak magnetic separations and a plurality of spiral classifications, so as to separate chromite from the laterite nickel ore, thereby obtaining a first chromium concentrate, a chromium middling, a weak magnetic separation middling and a mixed light ore; and a subsequent combined process of multiple ball millings, a second cyclone, a weak magnetic separation and a strong magnetic separation is used to further enrich and separate chromium from the mixed light ore, the weak magnetic separation middling and the limonite and chromite that have been missed in the strong magnetic separation magnetic material, thereby screening out more second chromium concentrate, facilitating a reduction in the chromium content in a subsequent high-pressure leaching stock solution, thereby achieving comprehensive utilization of the chromium element.

The invention provides a system and method for reducing filtered moisture of fine-ground hematite and limonite, and the system sequentially comprises a ball mill used for carrying out wet type fine grinding on raw hematite and limonite; the classification cyclone and the ball mill form a closed-loop ore grinding loop and are used for controlling the overflow granularity; the thickener is used for receiving overflow of the grading cyclone and is used for increasing the ore pulp concentration; the disc vacuum filter is connected with the thickener underflow and is used for carrying out vacuum filtration on the concentrated ore pulp; the water ring type vacuum pump is used for providing a filtering vacuum degree for the disc vacuum filter; wherein a cationic polyacrylamide flocculating agent is added into the thickener. According to the system, on the premise that a filter aid is not used and a filter press is not replaced, through four-parameter coupling of'granularity-concentration-flocculation-vacuum ', the filtering driving force is upgraded from'single vacuum degree' to a new mechanism of'controllable capillary channel structure and accurate vacuum degree matching ', and the water content of a filter cake is smaller than or equal to the pelletizing requirement.

The invention provides super-permeable nanoscale small-molecular-group water, and relates to the field of small-molecular-group water. The ultra-permeable nano-scale small molecular group water comprises the following raw materials in percentage by weight: 30%-40% of tourmaline, 30%-40% of medical stone, 20%-30% of limonite and purified water, the purified water adopts distilled water and accounts for 10-20 times of the total amount of the materials, the tourmaline adopts high-purity tourmaline powder, the granularity of the tourmaline is larger than or equal to 100 meshes, and the ultra-permeable nano-scale small molecular group water is prepared from the following raw materials in percentage by weight: 30%-40% of tourmaline, 30%-40% of medical stone and 20%-30% of limonite. The medical stone is used for releasing negative ions and far infrared rays in the heating process, the medical stone is treated medical stone powder with the particle size being larger than or equal to 100 meshes, and the limonite powder obtained after screening is conducted on the limonite with the particle size being larger than or equal to 100 meshes. Through the synergistic effect of the tourmaline, the medical stone and the Muyu stone, water molecular groups are effectively cracked to form small molecular group water, and through the application of technologies such as heating stirring, ultrasonic treatment and filtering purification, high quality and multifunctionality of water are ensured.

The utility model discloses a winnowing separator for ore processing, which relates to the technical field of ore processing and comprises a case, and a feeding hopper for feeding ore is arranged at the top of the case; the screen surface is arranged in the machine box and used for screening and separating ores, the screen surface is obliquely arranged in the machine box, light materials are discharged from the low end of the screen surface, and heavy materials are discharged from the high end of the screen surface; the reciprocating driving mechanism is arranged in the case and is used for enabling the screen surface to move back and forth in the case to throw ores; the wind power mechanism is arranged in the machine box, located below the screen face and used for blowing the thrown ore, and therefore the ore materials (hematite, limonite, coal mine and the like) can be rapidly subjected to isovolumetric screening.

The application discloses a method for determining the gold-carrying amount of brown iron ore in heavy floatation tailings, which comprises the following steps: mixing the tailing sample with a composite reducing agent composed of flour, activated carbon, anhydrous sodium carbonate and ammonium sulfate; performing closed reduction roasting by subsection heating, constructing a loose porous structure and converting the gangue phase by the pore-forming effect of the ammonium sulfate and the fluxing modification of the sodium carbonate; obtaining the magnetic product by grinding and ultrasonic-assisted magnetic separation, and then performing oxidation roasting and acid dissolution treatment, removing the modified gangue by mass difference subtraction, calculating the net mass of the brown iron ore, and combining with the liquid phase gold content determination to obtain the gold-carrying amount; and the application effectively solves the problems of serious micro-fine particle brown iron ore wrapping, easy roasting and large gangue interference, and realizes the accurate determination of the gold-carrying amount.

This invention discloses a method for producing hematite concentrate from rich limonite powder. The rich limonite raw material has a moisture content of 9% or less. The raw material enters a dry grinding mill through a vibrating feeder at a controlled flow rate. The mineral particles produced by grinding are heated and sorted using circulating high-temperature flue gas and then captured by a gravity dust collector and dust collector to produce the hematite concentrate. This method reduces the production costs of sintered ore and pelletized ore, improves productivity, and reduces overall energy consumption.

The present invention relates to the field of iron and steel metallurgy, and in particular to a method for improving the quality of sintered ore in the sintering production of large-proportion limonite. The method screens raw coal based on tar yield, carbon-oxygen ratio, oxygen-hydrogen ratio, thermal stability index, calorific value and mechanical strength as indicators; the screened raw coal is sent into a dry distillation furnace to be isolated from air and heated to cause a pyrolysis reaction of the coal, and the remaining solid produced during the dry distillation process is lignite; the obtained lignite is used as a raw material to sinter large-proportion limonite. The present invention comprehensively solves the problem of poor sintered ore quality in the existing large-proportion limonite sintering through innovative lignite directional control steps, as well as in-depth analysis and effective application of the heat transfer-reaction-mass transfer multi-process coupled sintering mechanism of lignite in the sintering process.

This invention discloses a method for the comprehensive utilization of high-silicon hematite reverse flotation tailings. Hematite reverse flotation tailings with a TFe grade between 11.0% and 15.0%, SiO2 content >78.0%, and hematite comprising more than 95% of the total iron minerals are processed through a first-stage high-intensity magnetic separation, a first-stage grinding-second-stage high-intensity magnetic separation, and a cationic reverse flotation. The resulting products are: a first-stage high-intensity magnetic scavenging concentrate with a TFe grade >25.0%, suitable for use as an iron correcting agent in cement production; a first-stage high-intensity magnetic scavenging tailings with a SiO2 purity >96.0%, suitable for use as raw material for high-purity quartz sand production; and grinding tailings suitable for use as iron and silicon correcting agents in cement production. This method achieves comprehensive utilization of high-silicon hematite reverse flotation tailings. The method has advantages such as a short process flow, low energy consumption, and high resource utilization rate, and is particularly suitable for the efficient treatment and comprehensive utilization of high-silicon hematite reverse flotation tailings.

The invention discloses a limonite type laterite-nickel ore sintering method which comprises the following steps: step 1, taking limonite type laterite-nickel ore, drying the limonite type laterite-nickel ore, dividing the dried limonite type laterite-nickel ore into two parts, namely a material part A and a material part B, and modifying the limonite type laterite-nickel ore in the material part A to obtain modified laterite; 2, the modified laterite, the limonite-type laterite-nickel ore of the material B, fuel, flux and return mine are subjected to burdening and uniform mixing to obtain a mixture, and the mixture is granulated and sintered to obtain limonite-type laterite-nickel ore sintered ore; wherein the modified laterite is oxidized laterite and / or magnetized laterite. The modified laterite ore is prepared from part of the limonite type laterite-nickel ore, the adding proportion of different modified laterite ore can be adjusted according to requirements, other minerals are not introduced, and the sintered ore of the limonite type laterite-nickel ore can serve as high-quality furnace charge of a blast furnace, is high in product yield and drum strength and meets the requirements of the furnace charge of the blast furnace.

The present application relates to the technical field of goethite, and provides a goethite, a preparation method and application, the preparation method comprises the following steps: S1, coarse crushing of limonite, sieving, to obtain a coarse crushing sample; S2, fine crushing and grading sieving, to obtain a plurality of batches of fine sieving samples; S3, heating and heat preservation of the fine sieving samples; S4, magnetic separation of the fine sieving samples, and weakly magnetic hematite and strongly magnetic substances are extracted together; S5, repeating steps S3 and S4 until the content of the remaining magnetic substances is within a set threshold; S6, cooling the fine sieving samples to below the Neel temperature of goethite, and then performing magnetic separation again to separate goethite. The present application has the advantages of large processing capacity, high processing efficiency, continuous production, and significantly reduced difficulty in obtaining goethite. In addition, compared with the traditional hydrothermal synthesis method, the present application removes the use of chemical products, effectively reducing the environmental problems in the production process of goethite.

The utility model discloses a system for producing iron ore concentrate and co-producing sulfuric acid through limonite flue gas desulfurization, which comprises a desulfurization tower, a desulfurization liquid circulating pump, a silicon slag filter, a concentration crystallizer, a centrifugal machine, a rotary kiln, a sulfuric acid absorption tower and a sulfuric acid absorption circulating pump, by adopting the system disclosed by the utility model, the process of producing iron ore concentrate and co-producing sulfuric acid through limonite flue gas desulfurization is realized, the iron oxide of the limonite is used for replacing the traditional limestone flue gas desulfurization, the production cost is reduced, the production efficiency is improved, and the production cost is reduced. Meanwhile, sulfur dioxide in the flue gas is used for producing sulfuric acid, and iron oxide in the limonite is enriched for producing iron ore concentrate.

The invention relates to a comprehensive smelting method of low-grade tungsten-containing limonite, and belongs to the technical field of metallurgy and chemical engineering. The method comprises the steps that S1, mixed acid synergistic leaching is conducted, specifically, after mineral powder is pretreated and activated through concentrated sulfuric acid, phosphoric acid is used for leaching, tungsten and iron are efficiently dissolved out and enter a leaching solution, and silicon, aluminum and calcium impurities are inhibited in leaching residues; s2, synergistic extraction separation: adopting an N235-TBP composite extraction system to extract tungsten from the leaching solution with the high iron ion background at high selectivity, and performing reverse extraction on the tungsten-containing extraction solution to extract tungsten, so as to realize deep separation of tungsten and iron; and S3, resource recycling: after the iron-containing raffinate is subjected to graded impurity removal, battery-grade iron phosphate is prepared through oxidation precipitation and crystallization roasting, and an ammonium sulfate byproduct is recycled. According to the method, efficient, clean and comprehensive recovery of tungsten and iron in the low-grade tungsten iron ore under the normal pressure is achieved, the leaching rate is high, the separation effect is good, iron is converted into a high-added-value product iron phosphate, efficient utilization of resources is achieved, and the method is environmentally friendly.