80 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 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 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 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 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.

The invention discloses a purification method of quartz sand tailings, and relates to the technical field of quartz sand production. According to the method, firstly, the quartz sand tailings are pretreated, iron ore in the tailings is made to generate gaseous ferric chloride and titanium chloride by adding sodium chloride to be removed, and under the action of microwaves, cracks are generated and cracked on interfaces between minerals, so that fine impurities in the tailings are exposed, and then the acid etching effect is enhanced; the ultrasonic action can enhance the reaction of mineral substances with acid and chlorine and can further crush fine particles, then through ball milling, quartz sand is in a mineral monomer dissociation state, then through high temperature, an iron phase existing in the form of limonite in tailings is converted into a magnetic iron phase, then the iron phase is separated from a quartz phase, and the iron phase is separated from the quartz phase. The method comprises the following steps of: firstly, performing high-temperature calcination on a cross section, then roasting under reducing gas to complete enrichment of iron, and simultaneously performing high-temperature calcination to expose aluminum atoms on the cross section, and further performing accurate impurity removal on the aluminum atoms through microorganisms to obtain high-purity quartz.

The invention relates to pyrogenic extraction of metallic nickel from laterite-nickel ore, in particular to preparation of nickel-containing molten iron by smelting reduction of high-aluminum limonite type laterite-nickel ore, and belongs to the technical field of metallurgy. The method comprises the following steps: firstly, crushing raw ore of high-aluminum limonite type laterite-nickel ore and raw ore of saprolite type laterite-nickel ore, and taking 50-70% by mass of high-aluminum limonite type laterite-nickel ore, 12-24% by mass of saprolite type laterite-nickel ore, 8-12% by mass of a carbon-based reducing agent and 10-14% by mass of a flux in a batching section to form a comprehensive material; feeding the comprehensive material into a rotary kiln, uniformly mixing, removing crystal water at 350-450 DEG C, and then gradually heating to 700-850 DEG C for roasting; and hot charging the roasted product into an electric furnace, and smelting and reducing for 1-2 hours at the temperature of 1450-1550 DEG C, so as to obtain nickel-containing molten iron and slag after the reaction is completed. The method is simple in technological process, and the problem that the high-aluminum limonite type laterite-nickel ore cannot be smelted into the nickel-containing molten iron through the blast furnace can be solved.

The utility model relates to a limonite coal-based oxidation-reduction roasting system which comprises an oxidation roasting system, a reduction roasting system, a cooling slurrying system and a hot air circulating system which are connected in sequence, and the oxidation roasting system comprises a constant feeder, a rotary kiln and a combustor; the reduction roasting system comprises a first screw feeder, a reducing agent bin, a reducing agent screw feeder, a reduction reactor, a discharge chute, a second screw feeder and a feeding chute; the cooling pulping system comprises a sealed stirring tank, a slurry pump and a spraying system, and the hot air circulating system comprises a water bath dust remover, an air return fan and an air conveying pipeline. The system has the advantages that the system enables limonite coal-based oxidation and reduction roasting to be performed in sections according to process requirements without mutual interference, the reduction reactor adopts an internal spiral reactor and is easy to seal, a certain pressure in the reactor is ensured, and the reduction efficiency is improved. The spiral rotating speed of the reactor is adjustable, and reduction time can be adjusted according to reaction requirements.

The invention provides a preparation method and application of a sub-nanometer zero-valent composite mineral-based three-dimensional organic framework material for deeply treating silicon and fluorine in photovoltaic wastewater, and belongs to the technical field of deep treatment of fluorine and silicon in photovoltaic wastewater. The preparation method comprises the following steps: respectively crushing lapis lazuli, aluminum-rich pyrophyllite, limonite, phoenix stone, barite and dolomite, sieving, mixing, reducing and roasting in a hydrogen atmosphere to obtain a nano zero-valent complex mineral, adding the nano zero-valent complex mineral into a nano sand mill, adding grinding balls, an organic ligand, an organic solution and a grinding aid, and carrying out multi-element wet-type ball milling to obtain the nano zero-valent complex mineral. The preparation method comprises the following steps: preparing a sub-nano zero-valent complex mineral, performing water bath ultrasonic treatment on the sub-nano zero-valent complex mineral by adopting a 3D printing technology to obtain a 3D-sub-nano zero-valent complex mineral, and finally performing hydrothermal reaction to obtain the sub-nano zero-valent complex mineral-based three-dimensional organic framework material which has high adsorption performance and high activity and can realize efficient removal of silicon-containing and fluorine-containing wastewater. The invention aims to overcome the defects that the existing commercially available adsorbent has low removal rate on silicon and fluorine and is easily interfered by other ions.

The invention belongs to the technical field of metal smelting, and provides a method for preparing high matte nickel from low-grade limonite type laterite-nickel ore. Comprising the steps that the low-grade limonite type laterite-nickel ore and a reducing agent are mixed and heated to 900-1150 DEG C, smelting is conducted for 0.5-1 h, and a reduced material is obtained; adding lime into the reduced material, introducing continuous carbon dioxide, smelting for 2-4 hours, heating to 1400-1700 DEG C, and discharging slag; silica is added, after sulfur is sprayed into the bottom of the molten liquid, air is continuously introduced, and slag is discharged after smelting is conducted for 0.5-1 h; and silica is added, air is continuously introduced, molten metal is discharged after smelting is conducted for 5-7 h, and the high matte nickel is obtained. Firstly, a reducing agent is used for reducing most of iron and nickel into simple substances from oxides, then carbon dioxide, sulfur and air are used for converting the iron simple substances into oxides, sulfides and ferrous oxide in sequence, slagging removal is carried out along with silica, and the remaining matte phase becomes high matte nickel.

The invention belongs to the technical field of mineral processing, and aims to solve the problem that flotation of high-carbon high-iron high-mud lead-zinc ore is difficult due to coexistence of carbonaceous substances, iron minerals and mud substances. The invention discloses a lead separation process for high-carbon, high-iron and high-mud lead-zinc ore difficult to separate, and aims to solve the problem that flotation is difficult due to coexistence of carbonaceous substances (such as organic carbon, graphite and the like), iron minerals (such as hematite and limonite) and muddy substances (such as phyllite, biotite and clay) of the high-carbon, high-iron and high-mud lead-zinc ore. The use amount of an inhibitor is reduced through mixing of carbon and iron mud and coarse scavenging, step-by-step inhibition of inhibition mechanisms of calcium hypochlorite, carboxymethyl cellulose and corn starch is combined, and efficient recovery of lead minerals is achieved through a different-speed concentration and multiple purification technology. According to the technology, the lead concentrate grade reaches 45% or above, and the zinc inclusion rate is 1t; the comprehensive recovery rate is increased by more than 10%, and the method has remarkable economic benefits and environmental benefits.

The invention discloses a double-effect synergistic combined reagent for strengthening flotation desilicication of limonite / siderite and application of the double-effect synergistic combined reagent, and belongs to the field of flotation development and utilization of refractory iron ore resources. The double-effect synergistic combined medicament consists of citric acid and polyacrylic acid, and is used as a dispersing agent and an inhibitor at the same time; in the citric acid-polyacrylic acid combined reagent, the content of citric acid is 70%-95% and the content of polyacrylic acid is 5%-30% according to the total mass percent of citric acid and polyacrylic acid being 100%. The method is applied to flotation of refractory limonite or siderite, flotation is carried out on an ore sample prepared through size fraction by adopting a flotation process of roughing, concentration and scavenging, and a citric acid-polyacrylic acid combined reagent is added in the roughing and concentration processes. Citric acid and polyacrylic acid adopted in the invention have dual effects of an inhibitor and a dispersant, can be mixed and dissolved with water, are non-toxic and pollution-free, have chemical stability, are small in dosage, and have the advantages of cheap and easily available raw materials, low cost, excellent flotation indexes and the like.

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.