116results about How to "Improve iron grade" patented technology

The invention provides a metallurgical composite pelletizing prepared through a twice pelletizing method, as well as a preparation method and an application thereof. The pelletizing is provided with a pelletizing shell formed by a central pelletizing core and a pellet material coating the outside of the pelletizing core. The internal pelletizing core of the formed pelletizing is in a reducing atmosphere, the outside of the formed pelletizing is in an oxidizing atmosphere, and the metallurgical composite pelletizing undergoing twice pelletizing satisfies the metallurgical requirements. The pelletizing core takes an iron-containing material and reducing coal dust or coke powder as raw materials in which adhesive and waste fly dust are added, and is obtained by means of disk pelletization or pressure pelletization. The pelletizing shell takes the iron-containing material and the pelletizing core as raw materials in which the adhesive is added, and is obtained by means of disk pelletization and taking the pelletizing core as the center of the sphere. Various metallurgical performance indexes of the composite pelletizing are highly better than normal pellets. The composite pelletizing not only realizes the harmlessness and the recycling of the waste fly ash, but also can greatly improve the technical and economic indexes of iron making blast furnaces. In addition, the composite pelletizing not only achieves such social benefits as energy conservation, emission reduction, environment protection and environment pollution treatment, but also can create considerable economic benefits.

The invention relates to a processing method of stainless steel cold rolling pickling wastewater. The pickling wastewater enters a hexavalent chrome secondary reduction pool after the actions of micro-electrolysis and hexavalent chrome preliminary reduction of a scrap iron filtering pool; the reduced wastewater enters a front-segment precipitation tank after neutralization and aeration, heavy metal sludge is concentrated and dehydrated, and the heavy metal sludge and scrap iron after the use of the scrap iron filtering pool are recycled and used as stainless steel smelting raw materials; middle-segment precipitation is carried out after a primary supernatant acts with a precipitant, and dehydrated and dried fluoride sludge is recycled and used as a metallurgical adjuvant material; final-segment precipitation is carried out after a secondary supernatant continues to act with a flocculating agent to obtain calcium salt which can be used as a building material raw material; and after the three segments of precipitation of acidic wastewater, the final third level supernatant reaches a standard and is discharged through water quality regulation and sand filtering. The invention has the advantages of less investment, low wastewater processing cost, convenient maintenance and the like, and not only can effectively utilize discarded scrap iron of a stainless steel enterprise, but also can greatly lower the subsequent wastewater processing cost and the operating load.

A process for extracting iron from comprehensive tailings of refractory iron ores comprises the following main steps: after drying and scattering the comprehensive tailings of the refractory iron ores, magnetically separating the comprehensive tailings of the refractory iron ores by using a dry type low-intensity magnetic separation machine to obtain magnetic tailings and non-magnetic tailings; and carrying out size grading on the magnetic tailings to remove the magnetic tailings with low coarse fraction grade and high SiO2 content; carrying out three-stage low-intensity magnetic separation and desilicification to increase iron grade so as to obtain qualified iron ore concentrates; granulating and drying the non-magnetic tailings at first, and then mixing the non-magnetic tailings with a pulverized coal reducing agent; loading in a rotary kiln in a mixed manner and magnetically roasting, wherein roasting temperature is 700-850 DEG C and high-temperature roasting time is 30-50 min; after roasting is finished, cooling to the temperature below 100 DEG C by using an indirect water-cooling mode; and then carrying one-stage grinding and two-stage magnetic separation to obtain qualified iron core concentrates finally. Compared with the traditional tailings treatment method, the process is purposeful, the comprehensive tailings are classified according to different properties of the comprehensive tailings, the tailings treatment efficiency can be improved, so that useful resources are extracted to a maximum extent, and the tailings of the refractory iron ores are utilized comprehensively.

The invention discloses a method for preparing steel smelting furnace materials from a phosphorus-containing globulitic hematite. The method comprises the following steps: adding adhesives with certain proportion into a globulitic hematite which is broken and grinded to the granularity smaller than 0.074mm and has the mass percentage of 50% to 60%, mixing evenly, then, agglomerating, reducing and sintering dried blocks with coal as reducing agent with the sintering temperature of 1000 to 1050DEGC and with the time of 2 to 1.5h, breaking and grinding cooled reduced blocks to smaller than 0.074mm with the mass percentage of 80% to 90%, magnetically selecting and separating the blocks with the magnetic field intensity of 0.1 to 0.12T, and obtaining the metal iron powder, wherein the adhesive is mixed by sodium sulfate powder, solubor, natrium humate and sodium xanthonate, the mass percentage of sodium sulfate powder in the hematite is 5% to 8%, the mass percentage of solubor in the globulitic hematite is 1% to 2%, the mass percentage of natrium humate in the globulitic hematite is 0.5 % to 1%, and the mass percentage of sodium xanthonate in the globulitic hematite is 0.5 % to 1%. The method has high utilization efficiency, excellent dephosphorization effect, excellent product quality, high iron recovery rate, low cost and low environment pollution.

The invention belongs to the technical field of mineral machining and particularly relates to a novel method for producing iron concentrates through complex refractory iron ore. The novel method includes the steps that firstly, the complex refractory iron ore is subjected to ore grinding classifying treatment; classified overflow products are subjected to magnetic separation preconcentration, and powdery preconcentrated concentrates are obtained; the powdery preconcentrated concentrates are fed into a suspension roaster to obtain suspension roasted ore; water is added to the suspension roasted ore, and ore pulp is manufactured, preconcentration is conducted, and obtained magnetic concentrates serve as rough concentrates; and an electromagnetic separator is used for conducting concentration on the rough concentrates, the obtained concentrated concentrates are filtered, moisture is removed, concentrate products with the iron grade ranging from 60% to 68% are obtained, the recovery rate of iron ranges from 80%-90%, the concentrate products with the iron grade ranging from 60%-68% are subjected to reverse floatation desilicication, and concentrate products with the iron grade ranging from 61% to 69% are further obtained. The iron concentrate products with the iron grade larger than 60% are obtained, the recovery rate of iron is larger than 80%, product indexes are stable, the economical efficiency is good, and complex refractory iron ore resources can be efficiently utilized.

The invention relates to a high-efficiency economic secondary treatment process for steel slag. The process comprises the following steps: step 1, allowing steel slag processed in an enclosed steel slag heating workshop to enter a first overturning grate for screening and carrying out magnetic separation on materials on the grate by using an electromagnetic chuck; step 2, allowing materials below the grate to enter a first belt magnet separator for magnetic separation and allowing non-magnetic steel slag to enter a hydraulic jaw crusher for crushing; step 3, allowing the material processed by the hydraulic jaw crusher to enter a second vibrating screen for screening and allowing materials below the second vibrating screen to enter a second belt magnet separator for magnetic separation so as to obtain magnetic separation powder and tailing powder; and step 4, allowing materials on the second vibrating screen to enter a rod mill for rod milling, allowing materials having undergone rod milling to enter a third vibrating screen for screening and allowing materials below the third vibrating screen to enter the second belt magnet separator for magnetic separation so as to obtain magnetic separation powder and tailing powder. The process provided by the invention can maximumly recover steel slag, has a high slag steel recovery rate and a high tailing utilization rate and is simple and easily practicable.

The invention discloses a method for producing oxidized pellets by completely substituting organic binder for bentonite. Aiming at different types of iron concentrate, the method introduces two types of organic binder carriers, namely an iron-containing raw material and limestone or dolomite. The two types of carriers both have pre-dispersing function and the characteristic of leading in no acid gangue, and can strengthen the strength of the pellets. The method comprises the following steps of adding the organic binder into the carriers, stirring and well mixing the binder and the carriers, so as to prepare carrier-type organic binder with the mass percent of the organic binder between 2 and 10 percent. 1.0 to 2.5 percent of the carrier-type organic binder is added into the iron concentrate, and can completely replace the bentonite. The method overcomes the disadvantage that acid gangue is led in after the bentonite is added into the pellets, and simultaneously breaks through the limitation that the organic binder can not be completely substituted for the bentonite under the conditions of the prior art.

The invention provides a separation method of high-silicon low-grade oxidized iron ore. Raw ore is crushed and sieved, lump ore and powdery ore are obtained, and the lump ore is divided into two sizes of particles; the powdery ore and the lump ore with the two sizes of particles are pre-separated respectively, and powdery ore pre-separated concentrate and full-particle-size lump ore pre-separated concentrate are obtained; the powdery ore pre-separated concentrate is ground by a ball mill and then subjected to high-intensity magnetic separation including one-time roughing separation and two-time scavenging, and high-intensity magnetic concentrate is obtained; the full-particle-size lump ore pre-separated concentrate is subjected to three-section ore grinding and three-section low-intensity magnetic separation after sintering, and low-intensity magnetic concentrate is obtained; the low-intensity magnetic concentrate is subjected to reverse flotation, and flotation concentrate is obtained; the high-intensity magnetic concentrate and the flotation concentrate are mixed in the ratio being 1:1, and comprehensive concentrate is obtained. Different particle sizes of iron ore are deeply pre-separated through different processes, tailings are discarded in a grading manner, ore inclusions are avoided, waste stone is discarded to the greatest extent, and the follow-up ore separation load is reduced. Different means are adopted for purification in different links, the whole technology has high adaptability, finally, the iron grade is up to 53.58%, the content of SiO2 is reduced to 12%, and the metal recovery rate of the whole process is up to 70.9%.

The invention provides a chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore. The process mainly comprises the following steps: (1) particle size grading of the iron ore: a step of selecting iron ore respectively with particle sizes of 5 to 15 mm, 3 to 5 mm, 1 to 3 mm and 0 to 1 mm from iron ore with particle sizes of 0 to 15 mm; (2) heating and oxidizing in a chain grate: a step of drying, preheating and oxidizing the iron ore with particle sizes of 5 to 15 mm in the chain grate; (3) roasting in a primary magnetizing rotary kiln: a step of subjecting the oxidized iron ore discharged from the chain grate, the iron ore with particle sizes of 3 to 5 mm and the iron ore with particle sizes of 1 to 3 mm to magnetic roasting in the primary rotary kiln; (4) roasting in a secondary magnetizing rotary kiln: a step of allowing the premagnetized iron ore discharged from the primary rotary kiln and the iron ore with particle sizes of 0 to 1 mm to undergo a reduction reaction with reductive carbon in the secondary rotary kiln in virtue of waste heat of the iron ore; and (5) grinding and magnetic separation of the roasted ore.

The invention provides a method for recycling iron, indium and tine in zinc volatilizing kiln slag. The method comprises the following steps: uniformly mixing zinc volatilizing kiln slag and a reducing agent, subsequently feeding the mixture into a rotary furnace to carry out reduction roasting, and at the same time capturing fume generated in the process; furthermore feeding oxidation gas into the rotary furnace, carrying out magnetic roasting and capturing the fume generated in the process at the same time; carrying out air-cooling on remaining materials inside the rotary furnace, grinding ore, and subsequently carrying out low intensity magnetic separation so as to obtain magnetite concentrate. The effective recycling of iron in the kiln slag is realized through the steps, and tail slag contains copper. The recycling rates of the iron, the indium and the zinc can be respectively 75-85%, 85-93% and 86-95%; through low intensity magnetic separation, the iron grade of the iron concentrate is improved while ensuring the recycling rate of the iron, the effective recycling of an iron resource is achieved, and the iron grade of the iron concentrate is improved to be 70-75% finally; the process is short, the operation is simple and feasible, economic cost is low and metal comprehensive recycling rate is high, a conventional process order of separation-first and smelting-later is broken, and the comprehensive utilization rate of a secondary resource is improved.

The invention relates to a method for separating boron and iron from ludwigite. The method comprises the steps of dissolving out ludwigite by using a sodium hydroxide solution in an autoclave, after carrying out solid-liquid separation, enabling sodium metaborate to enter a dissolution fluid, and cooling a crystal after concentrating to obtain sodium metaborate, wherein sodium metaborate is used for preparing sodium perborate, borax and boric acid; and cleaning first filter residues, and carrying out magnetic separation to obtain a high-grade iron ore concentrate and realize boron and iron separation. According to the method for separating boron and iron from ludwigite, the ludwigite is not needed to be subjected to high-temperature activated roasting treatment, the operation condition for dissolution reaction is relatively mild, and the dissolution rate of boron oxide can reach 88-93% and above; the method can be used for reducing energy consumption and high-temperature roasting equipment investment and is easy to control in operation; the iron grade of the obtained iron ore concentrate is increased by 7-15% or above, so that the steelmaking and ironmaking requirements are met; and sodium metaborate obtained by separation is used for further preparing sodium perborate, borax, boric acid and the like which have high added values, so that the utilization value of boron is increased.

The invention discloses a method for producing fine iron powder by sulfate slag, which is simple and high in iron recovery rate. According to the method, part of impurities in sulfate slag is removed first by acid wash and then alkaline wash, so that the grade of iron is improved to prepare fine iron powder. The sulfate slag based on weight contains 46-60% of iron. As the acid liquor is reacted with iron in the sulfate slag, technical personnel in the field are hard to imagine that the acid liquor can be used to improve the grade of iron. By means of different reaction activities of impurities in the sulfate slag and acid, an appropriate amount of acid is added to remove impurities which are easier to react with acid, and the impurities which are easy to react with alkali are removed by means of alkali wash, so that the grade of iron can be greatly improved based on simpleness and practicality. The iron recovery rate is high, and unexpected technical effects are obtained.

The invention relates to a beneficiation process for treating high-sulfur hematite-magnetic iron ore mixture. In the beneficiation process, treatment of raw ores with an iron grade being 25 -27 percent and a sulfur grade being 0.4-0.percent comprises the following step of obtaining a 58-62 percent primary overflow product with the overflow particle size being -0.074mm. The beneficiation process ischaracterized in that secondary closed circuit grinding is performed on the overflow product to obtain a product with the particle size being -0.3mm, coarse and fine particle classification is performed on the product with the particle size being -0.3mm with a high frequency fine screen II to obtain a coarse product with the particle size being 0.3-0.074mm and a fine product with the particle size being -0.074mm, beneficiation is performed on the coarse product with operation of low-intermediate intensity magnetic separation, gravity separation, low intensity magnetic separation, middling closed circuit regrinding and reverse flotation, beneficiation is performed on the fine product with operation of low-high intensity magnetic separation, middling closed circuit regrinding and reverse flotation, and iron concentrates with an iron grade being 66 percent or above and a sulfur grade being 0.1 percent or below are obtained. The beneficiation process has the advantages that technical indexes are qualified, and the economic benefit is remarkable.

The invention discloses a bentonite cellulose ether iron ore pellet additive, and a preparation method and application thereof, and belongs to the field of metallurgy. The pellet additive is prepared from the following raw materials: cellulose ether, iron powder, starch ether and sodium bentonite; and the preparation method comprises the following steps of: grinding the cellulose ether and the iron powder to obtain a component 1; grinding the starch ether and the sodium bentonite to obtain a component 2; and mixing the component 1 and the component 2, and continuously grinding to obtain the pellet additive. The bentonite cellulose ether iron ore pellet additive has excellent adhesive property and wrapping property, can effectively improve the physical properties and metallurgical properties of finished pellets, comprehensively improve the total iron grade, quality and yield of the finished pellets and also can effectively reduce production cost and energy consumption, and is suitable for large-scale industrial production.

The invention belongs to the technical field of mineral processing, in particular to a method for preparing iron concentrate by reducing the coercive force of refractory iron ore magnetized roasted ore. The method of the present invention is aimed at the reductive magnetization roasting product of refractory iron ore, cooling to a certain temperature under the condition of reducing atmosphere or neutral oxygen-free atmosphere, controlling the flow rate of air in the cooler, and reducing the coercivity under the condition of ensuring mineral magnetism Grinding-Magnetic Separation-Concentration, to obtain iron concentrate products with high iron grade and high recovery rate, which successfully reduces the coercive force of roasted ore, solves the problem of magnetic agglomeration in the process of magnetic separation, and improves the Sorting index, stable product quality and good economy.

A dressing method for the Linjiang iron-manganese ore includes such steps as crushing by 2-100 mm, calcining with gas or coal as reducing agent, natural cooling, pulverizing, two-stage magnetic separation by weak magnetic field and electromagnetic fine separation.

The invention provides a method for removing phosphorus and leaching iron from high-phosphorus oolitic hematite through cross flow. The method comprises the following steps: the high-phosphorus oolitic hematite is grinded to be less than 0.147 mm; the grinded high-phosphorus oolitic hematite reacts with a hydrochloric acid leaching agent with a certain concentration; a certain amount of the leaching agent is taken out and added with the high-phosphorus oolitic hematite with a certain mass for reaction; the solid obtained through separation after reaction is used as an ironmaking raw material; the filtrate is continuously used for treating the high-phosphorus oolitic hematite, the mass of which is equal to that of the filtrate; the above steps are repeatedly until phosphorus content in the solid obtained through separation is higher than 0.2%, so that the iron is leached out and the phosphorus is removed through multi-stage cross-flow. According to the method, a multi-stage cross-flow method is adopted, the filtrate obtained after leaching for each time is in contact with new high-phosphorus oolitic hematite, so that acid in the filtrate is used fully, the whole process forms a closed cycle, multiple high-phosphorus iron ores are treated, the water consumption is less, compared with a one-step acid leaching method and a two-step acid leaching method, the method can efficiently remove phosphorus from the high-phosphorus oolitic hematite, the phosphorus removal rate can reach 90-99%, the iron content in the filtrate is reduced, the loss of iron is reduced greatly, and the grade of total iron is improved by 6-12%.

The invention discloses a process for comprehensive recovery of copper-cobalt-containing sulfuric acid slag. The process comprises the following steps that (1) the copper-cobalt-containing sulfuric acid slag is subjected to bioleaching, a vaccinal bacterium is Sulfobacillus thermosulfiooxidans 6Y-1, the leaching pH value is maintained within 1.8-2.5, the reaction period is 1.5-3 h, and the temperature is 60-80 DEG C; (2) bioleaching liquid is subjected to extraction through a copper extractant, an extraction phase enters electrodeposition after reverse extraction through sulfuric acid, and finally cathode copper is obtained; (3) copper extraction residual liquid is precipitated through limestone, iron is removed, cobalt extraction is conducted on a solution after iron removing through a mixed extractant of P507 and Cyanax272, the extraction phase is subjected to reverse extraction through sulfuric acid and concentrated, and a cobalt product is obtained; and (4) bioleaching slag obtained from the step (1) and iron slag obtained after precipitating and iron removing from the step (3) are combined and subjected to reduction roasting, and a metallization pellet is obtained. Valuable metal in the sulfuric acid slag is recycled through bioleaching firstly, meanwhile, the iron grade of the leaching slag is improved, the sulphur grade in the leaching slag is reduced, the quality of a subsequent metallization pellet is further improved, and finally comprehensive recovery of copper-cobalt iron is realized.

The invention relates to a method for recovering iron from zinc hydrometallurgy rotary kiln slag. The method comprises the steps of: primary ore grinding, weak magnetic rough separation, weak magnetic scavenging, secondary ore grinding and weak magnetic selection. The method is simple in process steps, can extract iron concentrates with the grade of higher than 58% from the rotary kiln slag, changes wastes into valuable materials, and realizes the resource regeneration.

The invention discloses a mineral processing process for improving the quality and reducing silicon of iron ore concentrate. The process comprises the following steps: finely grinding raw ores to obtain ore powder or ore pulp of which the ore powder or ore pulp with the granularity of 325 meshes accounts for 80%, performing magnetic separation by using a 800-1000T magnetic separator to obtain a section of inferior fine magnetite concentrate and a section of inferior magnetic tailing, performing magnetic separation on the section of inferior magnetic tailing by using a 10000-14000T magnetic separator to obtain a section of high fine magnetic concentrate and a section of high magnetic tailing, performing magnetic separation on the section of inferior fine magnetite concentrate by using a 800-1200T magnetic separator to obtain two sections of inferior fine magnetite concentrate and two sections of inferior magnetic tailing, feeding back the two sections of inferior magnetic tailing to an ore grinding procedure for fine grinding, and performing magnetic separation on the section of high fine magnetic concentrate by using a 6000-10000T magnetic separator to obtain two sections of high fine magnetite concentrate and two sections of high magnetic tailing; and combing the two sections of inferior fine magnetite concentrate and the two sections of high fine magnetite concentrate to obtain total fine concentrate, and combining the section of high magnetic tailing and the two sections of high magnetic tailing to obtain total tailing. By adoption of the process, the grade of the iron ore concentrate can be increased by about 8.5%, the grade of a silicon product can be reduced by about 6.5%, the fineness of the iron ore concentrate can be improved, the abrasion of a conveying pipeline can be reduced, and the process is short in process procedure, low in operation cost and applicable to industrial popularization and application.

The invention provides an organic binder, and belongs to the technical field of pellet binders. The organic binder comprises the following components in percentage by mass: 15%-16% of carbon black, 27.5%-28.5% of dolomite, 0.5%-1.5% of glycerol, 37%-38% of polyethylene, 1%-2% of polyether, and 16%-17% of water. According to the invention, by controlling the components and the use amount of the organic binder, the organic binder can be guaranteed to still play a good binding effect under the condition that the use amount is extremely low (0.003 wt% to 0.005 wt%), the organic binder is fully dispersed and combusted in a pelletizing process, and the grade of pellets is not reduced. Results of the embodiment show that green pellets and finished pellets obtained under the condition that the use amount of the organic binder is 0.003 wt% to 0.005 wt% of iron ore concentrate are high in strength and quality.

The invention provides a method for removing harmful components in iron-containing solid waste, and belongs to the technical field of solid waste treatment. The method for removing the harmful components in the iron-containing solid waste comprises the following steps: drying the iron-containing solid waste to obtain dried solid waste; and leaching the dried solid waste by using a leaching solution, and then carrying out solid-liquid separation, wherein an obtained solid component is the solid waste from which the harmful components are removed, and the leaching solution comprises water, acidliquor or alkali liquor. According to the method, water, acid liquor or alkali liquor is used for leaching, so that the content of harmful components of sodium and chlorine in the solid waste can be reduced to a lower level, the iron grade is improved, the pretreated solid waste can be subjected to roasting, reduction and iron recycling, and part of the pretreated solid waste can also be directlyused as fine iron powder. Moreover, the method provided by the invention is simple and convenient in process and low in treatment cost, and the leaching agent can be recycled without secondary pollution.

The invention relates to an organic adhesive and an ironmaking pellet prepared from the organic adhesive. The organic adhesive is prepared by the following steps: mixing one or composition of rice, chaff, glutinous rice and corn in a ratio of 2:3:1:4, bulking with a bulking machine at 250-280 DEG C under the pressure of 1.1-1.2 MPa, and pulverizing to obtain the powder with the particle size of 150-200 mu m. The ironmaking pellet is prepared by pelletizing 0.1-0.5% of organic adhesive, 1-1.5% of calcium bentonite and the balance of iron concentrate powder. The organic adhesive is safe and reliable, and is convenient for transportation. The preparation technique is easy to operate, has the advantages of low cost, accessible raw materials and the like, and can enhance the physicochemical properties of the pellets in the pellet production. When the organic adhesive is used in the process of producing steelmaking slag, pipeline ash pellets, fluorite pellets and the like, the produced industrial finished product has favorable physicochemical properties, and the organic adhesive can solve the trouble and problems caused by other adhesives.