22 results about "Limonite" patented technology

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 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 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 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 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.

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 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.

This invention discloses an apparatus and method for grinding sintered limonite powder into pellet concentrate and removing crystal water. The apparatus includes a vertical mill, with a ring of air nozzles around the mill's grinding disc, a classifier above the grinding disc, a hopper below the classifier, and a discharge pipe at the center of the hopper. The vertical mill has a coarse powder outlet and a return material inlet. The hopper is connected to a coarse powder conveying device via the coarse powder outlet, which is connected to the air inlet of a roasting furnace. The air outlet of the roasting furnace is connected to a flue gas inlet, and the discharge outlet of the roasting furnace is connected to a return material inlet via a roasting return material device. The return material inlet is connected to the discharge pipe. This invention grinds coarse-grained limonite sintered powder into pellet concentrate using a vertical mill. While grinding the pellet concentrate, in addition to removing free water from the limonite sintered powder, it can remove some or even all of the crystal water from the limonite with high heat utilization, reducing the adverse effects of crystal water release during the pellet roasting process.

This invention belongs to the field of iron ore sintering technology and discloses a method for strengthening the sintering of high-ratio specular hematite. S1. Raw material pretreatment: Returned ore and dried limonite are sieved using a 0.25mm sieve. Returned ore and limonite with a particle size smaller than 0.25mm are mixed with specular hematite powder and then pretreated by high-pressure roller milling. S2. Mixing and granulation: The mixture is mixed with returned ore and limonite larger than 0.25mm, other iron-containing minerals, flux, and fuel, and then granulated. S3. Pre-oxidation: The granulated mixture is distributed, and after distribution, the material layer is pre-oxidized using hot air. S4. Sintering: The mixture undergoes ignition, sintering, crushing, and cooling sequentially to produce the finished sintered ore. This invention effectively improves the proportion of specular hematite, significantly reduces sintering energy consumption, and increases the strength of the sintered ore.

This invention discloses a method for preparing high-grade sinter based on optimized ingredient proportions, belonging to the field of sinter processing technology. It addresses the technical problem of improving the iron grade of sinter by optimizing the composition of the ingredients. Specifically, it uses three types of raw materials: the first type is magnetite concentrate powder from at least two different origins; the second type is hematite or limonite powder from at least two different origins; and the third type is auxiliary materials such as converter dust, blast furnace ash, and iron-containing steel slag. By constructing a synergistic combination of multi-source magnetite concentrate powder, multi-source hematite powder, and iron-containing solid waste auxiliary materials, and by coordinating auxiliary material premixing, quantitative addition of flux and coke powder, and appropriate granulation and sintering process control, the method improves the iron grade of the sinter while ensuring smooth sintering and metallurgical performance stability, achieving a comprehensive technical effect of increasing iron content without loss of stability. This method has good industrial applicability and promotional value.

The present invention provides a method and apparatus for producing iron from an iron ore, together with an option for the onward conversion of that iron into steel. The iron may come from an iron ore in which the iron is present as at least one of the mineral and mineraloid forms of iron oxide and iron oxyhydroxide, such as hematite and limonite, as well as from red bauxite. The invention may also be used to produce elemental iron from other sources of iron oxide, such as from mill scale, whereby sources of waste iron oxide may be recycled. The method comprises comminuting the iron ore into fines, dehydrating the iron ore and dehydroxylating hydroxylated compounds in the ore. The ore thus treated is then reacted with an amount of liquid sodium in excess of the stoichiometric amount thereof required for a redox reaction between the liquid sodium and iron oxide(s) from the ore. This precipitates out from the liquid sodium both elemental iron and other insoluble products at least comprising sodium oxide. The redox reaction is conducted in an inert atmosphere and its temperature is controlled to remain below about 450 °Celsius to inhibit the production of ternary oxides like Na4FeO3. The method then comprises separating the iron from the other insoluble products, for example using magnetic and / or density-based separation, and separating the iron and the other insoluble products as a solid phase from the liquid sodium, in any order. Thus iron can be extracted from iron ore without producing any greenhouse gas emissions, and sodium oxide, which has a high affinity for carbon dioxide, is produced as a co-product. Since the iron is produced as a finely divided particulate, it may subsequently be converted into steel using a powder metallurgical technique with a considerable energy saving over prior art steelmaking techniques. If the sodium oxide is used to mineralize captured carbon dioxide, the invention can have a negative carbon footprint overall. If the iron ore comprises red bauxite, the other insoluble products may also be processed to extract alumina from them without creating environmentally hazardous red mud. In some embodiments, the other insoluble products may be used to produce an alkaline activator for an alkaline activated or geopolymer cement. The corresponding apparatus (3a) comprises a comminution device (2) (such as a rock crusher or grinder), a dryer (4) for dehydrating and dehydroxylating the iron ore, a gas-tight reaction vessel (130) for reacting the treated ore with the liquid sodium, a solid-species separator (180a) for separating the iron from the other insoluble products and a solid-liquid sodium phase separator (190a, 190b).

This invention relates to a coal-based reduction method for iron ore magnetization roasting in a vertical shaft furnace. Addressing the limitation that existing iron ore magnetization roasting vertical shaft furnaces can only use gaseous reducing agents, this invention enables iron ore magnetization roasting in the vertical shaft furnace without the use of gaseous reducing agents. The process and apparatus are as follows: A pulverized coal injection device is added outside the existing vertical shaft furnace reduction zone. Part of the flue gas discharged from the vertical shaft furnace is used as the injection gas. High-volatile pulverized coal is injected into the reduction zone of the vertical shaft furnace using the pulverized coal injection device. After the pulverized coal is heated in the furnace, it undergoes high-temperature pyrolysis. Simultaneously, the residual carbon produced after pyrolysis reacts with CO2 in the flue gas to generate a reducing gas containing H2 and CO. After the iron ore is added from the top of the vertical shaft furnace, it passes through the drying preheating zone and the heating zone in sequence, raising the temperature to over 500°C. The hematite and limonite contained in the iron ore come into contact with the reducing gas, achieving iron ore magnetization roasting in the vertical shaft furnace without the use of reducing gas.

The invention relates to a sodium manganese oxide hybrid positive electrode material based on natural limonite and a preparation method thereof, and the preparation method comprises the following steps: crushing the natural limonite to a first particle size to obtain mineral powder; immersing the mineral powder into an acid etching solution, and carrying out first stirring treatment so as to expand the interlayer spacing of the mineral powder to obtain an acid-etched mineral; and adding the acid-etched mineral into molten salt, and carrying out ion exchange treatment to obtain the sodium manganese oxide hybrid positive electrode material. The problem that natural limonite is low in conductivity and low in cycle capacity retention rate when being used as an electrode material in the prior art can be solved.

The invention discloses a method for preparing high-quality pellets by matching ultrahigh-silicon low-FeO concentrate with fluorine-containing iron concentrate. The high-quality pellets comprise the following raw materials in percentage by weight: 25-29% of Bayan Obo iron concentrate I, 25-29% of Bayan Obo iron concentrate II, 35-45% of outsourced mixed magnetite concentrate, 4-6% of finely ground high-aluminum limonite and 2.4-2.6% of externally matched bentonite. The method comprises the following steps: proportioning a single iron material according to a set ratio, and conveying a mixture to a pelletizing disc for pelletizing; drying the green pellets in a drying box; preheating the dry balls through a muffle furnace; the preheated balls are roasted through a roasting furnace, and the roasting conditions of the roasting furnace are that the roasting temperature is controlled to be 1220-1240 DEG C, and the roasting time is 8-12 min. According to the method, under the background of high-proportion Bayan Obo iron ore concentrate, the compressive strength of the pellets is improved, and the reduction expansion rate is reduced.

The present application belongs to the technical field of sinter production, and particularly relates to a production method of acid sinter with high proportion of limonite and super-thick layer. 75% limonite powder, 5% magnetite powder and 20% blast furnace return fines are mixed, and the sintering flux proportion, solid fuel proportion and sintering return fines proportion are adjusted according to the sinter composition control standards to prepare sintered mixed and uniform material. The mixed and uniform material is mixed and granulated under steam pressurized water, and ignition sintering is performed under high temperature conditions. The present application can solve the problems of poor sinter strength, poor reducibility and high solid fuel consumption during the production of acid sinter with high proportion of limonite. Through the production process control of thick layer, low moisture and slow machine speed, the super-thick layer sintering of acid sinter with high proportion of limonite can be realized. In the mode of ensuring low cost of acid sinter production, the strength of acid sinter is comprehensively improved, which provides support for stable operation of blast furnace and cost reduction.

The application discloses a beneficiation process of a magnetic and hematite mixed iron ore. The magnetic and hematite mixed iron ore is first crushed into ore powder with a particle size of less than or equal to 2 mm, then the ore powder is treated by water immersion and microwave treatment to obtain pretreated ore powder; then the pretreated ore powder is subjected to ball milling treatment under the action of a grinding aid, weak magnetic separation, strong magnetic separation, to obtain a strong magnetic separation concentrate, positive flotation, to obtain a positive flotation concentrate, and reverse flotation, to obtain an iron concentrate. The beneficiation process is simple, the beneficiation cost is low, and the beneficiation process has very good beneficiation effect on the magnetic and hematite mixed iron ore with high magnetic iron content and fine embedded particle size, and has a good application prospect.

A device and method for selective reduction and stepwise smelting of limonite laterite nickel ore to produce nickel-cobalt alloy and molten iron belong to the field of mineral processing and metallurgical technology. The device includes a silo, a screw feeder, a multi-stage cyclone preheating and drying system, a flue gas dust removal system, a fluidized bed roasting main furnace heating system, a first cyclone separator, a fluidized bed reduction reactor, a second cyclone separator, a first electric furnace smelting reactor, and a second electric furnace smelting reactor. The method steps are as follows: limonite laterite nickel ore is placed in the silo; it is fed into the multi-stage cyclone preheating and drying system, preheated, and then enters the roasting main furnace for heating, dehydration, and decomposition to form dried material; after gas-solid separation, the solid material enters the reduction reactor, and the high-temperature flue gas is returned to the system for preheating and drying; nitrogen and reducing gas are introduced into the inlet of the reduction reactor respectively, forming reduced material that flows out from the outlet; the solid material after gas-solid separation enters the smelting reactor, and excess gas is burned for heating; the iron-rich slag is melted and reduced, and then discharged after smelting.

The invention discloses a preparation method for producing DR-grade iron ore concentrate from high-iron and high-aluminum hematite and limonite. According to the method, a proper mineral processing technology is determined through tests, the high-iron and high-aluminum type hematite and limonite can be used for producing DR-grade iron ore concentrate, meanwhile, the recovery rate of iron is increased, and high-valued utilization of iron ore is achieved. The resource utilization efficiency can be improved for iron ore mining enterprises, and a raw material guarantee is provided for green transformation of the downstream iron and steel industry.

The present application provides a kind of mineralogy prospecting method of cobalt polymetallic ore in highland arid-semiarid area, comprising the following steps: (1) in the field outcrop of highland arid-semiarid area, look for red-yellow brown iron mineralization, yellow potassium jarosite surface oxidation zone;(2) collect yellow potassium jarosite mineral oxidation zone sample in yellow potassium jarosite mineral oxidation zone;(3) utilize X-ray fluorescence spectrometer to carry out main component analysis to iron oxide, yellow potassium jarosite mineral oxidation zone sample;(4) the sample is screened, and X-ray powder diffraction analysis is carried out, and whether sodium jarosite diffraction peak is analyzed.The method provided by the present application takes simple and direct mineralogical species and component structure characteristics as the prospecting mark of highland arid-semiarid area hot water jet deposition type cobalt mine, realizes to reduce prospecting cost, reduce target area range, improve prospecting efficiency, also provides a new path for re-evaluation of traditional sulfide deposit associated cobalt resource potential.

The invention discloses a method for preparing oxidized pellets through optimized ore blending of laterite-nickel ore, which comprises the following steps: S1, pretreatment: drying laterite-nickel ore, and then carrying out crushing and high-pressure roller grinding pretreatment to obtain pretreated laterite-nickel ore; the laterite-nickel ore is one or more of limonite type laterite-nickel ore iron, transition type laterite-nickel ore iron and humus soil type laterite-nickel ore iron; s2, uniform mixing: fully and uniformly mixing the pretreated laterite-nickel ore obtained in the step S1 with a calcium-based flux to obtain a mixture; s3, pelletizing: pelletizing the mixture prepared in the step S2 to prepare green pellets; s4, oxidizing roasting, wherein the green pellets obtained in the step S3 are dried, preheated and roasted, and oxidized pellets are prepared; and S5, pellet smelting is conducted, specifically, the oxidized pellets obtained in the step S4 and the laterite-nickel ore sintered ore are subjected to ore blending and used for blast furnace smelting of ferronickel stainless steel mother liquor. In order to solve the technical problems of high coke ratio, large carbon emission and the like caused by single structure (sintered ore) and poor air permeability of a laterite-nickel ore blast furnace smelting furnace charge, a novel furnace charge structure of nickel-chromium-iron multi-element sintered ore matched pellet ore is designed, the current laterite-nickel ore single sintered ore blast furnace smelting technology is innovated, the blast furnace molten iron yield is increased, and the coke ratio is reduced.

The present application belongs to the technical field of metallurgical engineering, and discloses a utilization method of iron-containing dust slurry, which comprises the following steps: 1) proportioning sintering raw materials according to the following mass percentage: 25-30% of iron-containing dust slurry, 12-15% of iron concentrate, 15-18% of limonite, 25-30% of return fines, 3-3.5% of anthracite, 3-3.5% of quicklime, 5-6% of limestone, and 2-3% of dolomite; 2) mixing the sintering raw materials uniformly, and then mixing with water to obtain sintering mixture; and 3) granulating the sintering mixture, and then sintering to obtain sinter. In the present application, the iron-containing dust slurry is used as the sintering raw material, so that the recycling of the iron-containing dust slurry is realized, and the solid fuel consumption is reduced, thereby reducing the sintering cost.

The utility model relates to a mineral separation system for comprehensively recovering gold, silver and iron from limonite type gold oxide ore, which comprises a ball mill, a discharge port of the ball mill is connected to a feed port of a cyclone A through an ore pulp tank A and a slurry pump, and an overflow port of the cyclone A is sequentially connected to a stirring barrel A, a weak magnetic roughing machine I, a weak magnetic roughing machine II and a weak magnetic classificator; a concentrate outlet of the weak magnetic classificator is connected to the thickener A, an underflow port of the thickener A is connected to the ore pulp tank B, the ore pulp tank B is connected to a feed port of the cyclone B through the slurry pump, a sand settling port of the cyclone B is connected to a feed port of the vertical mill A, a discharge port of the vertical mill A is connected to the ore pulp tank B, and an overflow port of the cyclone B is connected to the stirring barrel B; and a discharge hole of the stirring barrel B is connected to the leaching barrel A. The device achieves comprehensive and efficient recovery of gold, silver and iron, is excellent in silver and iron recovery effect, has great significance in efficient enrichment of limonite type gold oxide ore difficult to separate and utilize, and is worthy of industrial popularization and application.