65results about How to "Good slag" patented technology

The invention relates to a converter steelmaking fluoride-free composite fluxing medium, which belongs to the treatment of molten iron alloy by adopting a finishing agent to remove foreign matters. The invention particularly relates to a quick fluxing medium for converter smelting, which consists of the following ingredients in percentage by weight: aluminum oxide (Al2O3): 25 to 45 percent; ferric oxide (Fe2O3): 15 to 35 percent; boron oxide (B2O3): 3 to 10 percent; magnesium oxide (MgO): 5 to 15 percent; calcium oxide (CaO): 3 to 15 percent; and the balance of foreign matters and caking agent. The fluxing medium presents in granular pellets and are filled into a furnace in two times at the beginning of the converter smelting, and 6 to 8 kg of the fluxing medium is added per ton steel. Compared with the prior art, the converter steelmaking fluoride-free composite fluxing medium has the advantages that: no calcium fluoride (CaF2) is contained, so the pollution of the atmosphere and thewater resource caused by the fluoride-contained gas and the fluoride ion can be avoided; the resource of raw materials is abundant, and price of the raw materials is low; the strength of the pellets is high, and the stability is good; the slagging is fast, and the slagging time is advanced about one minute; the whole-process slagging is good, no slag is splashed, no slag is dried, and no slag is adhered onto a gun; and the consumption of the steel is reduced, the consumption of the fluxing material is reduced, and the economic benefit is remarkable.

The invention discloses a gasification raw material. The gasification raw material comprises a first carbon-containing material, an alkali metal catalyst loaded on the first carbon-containing material, a second carbon-containing material, and an alkaline-earth metal catalyst loaded on the second carbon-containing material, wherein the first carbon-containing material and the second carbon-containing material are same or different. The invention also discloses a preparation method of the gasification raw material and a catalytic gasification method adopting the gasification raw material.

The present invention discloses a special bio-organic fertilizer for citrus and a preparation method for the bio-organic fertilizer, and relates to the technical field of agricultural fertilizer. The bio-organic fertilizer is prepared by mixing and pelletizing the following materials in parts by weight: 40-60 parts of organic matters, 20-40 parts of humic acid, 0.5-1.5 parts of microorganism, 0.5-1.5 parts of microelements, 1-3 parts of urea, 2-6 parts of monoammonium phosphate, 1-3 parts of potassium sulfate, 6-8 parts of calcium, 1-3 parts of talc powder, and 1-3 parts of an enveloped cementing agent. The bio-organic fertilizer has the characteristics of being green and environmental, suitable for being applied to southern citrus, and capable of promoting the high quality and yield of the southern citrus; the bio-organic fertilizer can be taken as ground fertilizer in winter for the southern citrus, as well as vegetables, flowers, fruits, tea leaves, and other fruit trees.

The invention relates to a Zhundong coal additive and provides an additive for improving Zhundong coal combustion and coking characteristics and a use method thereof. The additive comprises, by mass, 20-36% of SiO2, 8-18% of Al2O3, 12-28% of MnO2, 6-23% of Fe2O3, 4-10% of KMnO4, 5-15% of Fe(NO3)3, 1-5% of TiO2 and 2-4% of a waterproof adhesive. The additive of Zhundong coal can be prepared by simple processes, has a low cost, can be transported, stored and used conveniently, can well improve Zhundong coal combustion, coking, slag-bonding and dust deposition characteristics, can effectively improve a blending combustion ratio of Zhundong coal, and has no side effect on fire coal equipment, no damage on the human body and no pollution on the environment.

The invention discloses a bio-briquette and a method for the same. The bio-briquette comprises following components in portion by weight percent: 0 to 20 portions of bituminous coal, 20 to 35 portions of anthracite coal, 30 to 60 portions of low-grade anthracite coal, 0 to 30 portions of biomass, 0 to 4 portions of sulfur-fixing agent and 0 to 10 portions of binding agent; the bio-briquette can also comprises 7 to 15 portions of water-proofing agent. In the bio-briquette of the invention, the addition amount of the biomass can reach a very high value, if materials are reasonably mixed and used, the consumption of the binding agent such as sienna is obviously reduced or the sienna is not used; the bio-briquette is excellent in the sulfur-fixing effect, high in strength and uneasy to loose and drop slag; moreover, while firing, the bio-briquette has bright flames and can be completely fired, and after firing, the slag shape is good, so that the bio-briquette can be applied to boilers or small sized burners for domestic use.

The invention discloses a treatment method of nickel-containing eluvial ores. The treatment method comprises the following steps: (1) dividing the nickel-containing eluvial ores into magnesian ores and iron ores; (2) carrying out leaching treatment on the iron ores by utilizing sulfuric acid to obtain a leaching solution containing ferric sulfate, wherein the content of free acid in the leaching solution containing the ferric sulfate is 40-45g/l; (3) carrying out first neutralization treatment on the leaching solution containing ferric sulfate by utilizing the magnesian ores to enable the content of the free acid in the leaching solution to be lowered to 5g/l, and obtaining a solution after neutralization and leaching residues containing silicon dioxide; (4) carrying out second neutralization treatment on the solution after neutralization obtained in the third step by utilizing magnesium hydrate, and maintaining the pH value to be 1.0-1.5 to obtain precipitated iron concentrate and a solution after iron removal; and (5) carrying out third neutralization treatment on the solution after iron removal obtained in the fourth step by utilizing the magnesium hydrate to enable the pH value of the solution after iron removal to remain between 7.0-7.5, and obtaining nickel-cobalt hydroxide precipitates and a magnesium sulfate solution.

The invention relates to a double-flow oxygen gun and a use method thereof, and belongs to the technical field of converter steelmaking. The double-flow oxygen gun has the advantages that a novel structure is used, and the converter steelmaking heat efficiency is improved, so that the converter cold material ratio, the slag melting effect and the terminal temperature hit rate are improved. Oxygen gun main holes and sub holes are formed in the spray head. The number of main holes and the number of sub holes at an oxygen inlet in the oxygen inlet direction of the spray head are identical; in the oxygen outlet direction of the spray head, the number of the main holes is unchanged, and the number of the sub holes at the outlet can be 1 to 3 times of the number of the sub holes at the inlet. The number of the main holes at the outlet of the spray head is 3 to 6, and the number of the sub holes is 6 to 15. The flow rate of the main holes accounts for more than 85 percent of the total flow rate; the flow rate of the sub holes accounts for less than 15 percent of the total oxygen supply. The outlet direction of the sub holes is not limited by the inlet direction of the sub holes, can be in various directions, and can be downward, horizontal and upward, so that the secondary combustion rate of a converter is sufficiently improved. During the oxygen gun operation, the blowing gun position is 100 to 200 mm higher than a conventional gun position; the slag sputtering gun position is 50 to 100mm higher than the conventional oxygen gun position.

The invention discloses a comprehensive recovery method for zinc hydrometallurgy net liquid slag. The method comprises the steps of low-acid leaching, neutralization and removal of iron and arsenic, recovery of cobalt and recovery of cadmium in sequence; zinc-enriched leaching liquid is returned to a zinc smelting system after removal of copper, iron, arsenic, cobalt and cadmium; the step of recovery of cobalt is to heat iron and arsenic removal leaching liquid to 90-95 DEG C; sodium carbonate is fed to adjust the pH value within 4.5-5.0; ammonium persulfate or sodium persulfate is fed for chemical reaction, and is fed according to a ratio that the molar weight of S2O32+ is 4-6 times of the molar weight sum of Fe2+, Mn2+ and Co2+; the reaction time is 1-2 hours; and cobalt slag and cobaltremoval leaching liquid are obtained through solid-liquid separation.

The invention discloses a method for smelting ultra-low carbon steel with carbon lower than or equal to 20 PPm. The method comprises the steps that molten iron desulphurization is conducted through pure magnesium and slaked lime, smelting in another furnace is conducted, high carbon ferromanganese is added according to high oxygen content; argon blowing is conducted; vacuum treatment is carried out inside a RH furnace; vacuum decarburization is conducted, a low-carbon refining agent is added to carry out desulfuration and slugging, and when the vacuum treatment is conducted for 15 min, aluminum balls are added; after recycling is conducted for 3 min, silicon iron, ferromanganese, a low-carbon desulfurizing agent are added immediately, and after the recycling is conducted for 5 min, the vacuum treatment is finished; the aluminum balls are sprinkled on the surface of steel slag, and after the total content of iron oxide and MnO in the slag is lower than 5.5 wt%, a later procedure is conducted. On the premise that the mechanical property of the ultra-low carbon steel is guaranteed, the carbon can be lower than or equal to 20 PPm, parts of low-carbon ferromanganese is replaced with parts of the high carbon ferromanganese, the carbon content is lower than 0.15 wt%, parts of slugging materials and parts of a deoxidizing agent are replaced with the low-carbon refining agent and the low-carbon desulfurizing agent, the cost can be lowered by at least 30 yuan per ton of steel, the smelting process is stable, and slagging is good in the refining process.

The invention discloses a high-efficiency clean pulverized coal combustion industrial boiler device in the field of combustion devices with combustors. The high-efficiency clean pulverized coal combustion industrial boiler device comprises a hearth, a cyclone pulverized coal burner, a high-temperature vortex burnout device, a transition chamber, a convection flue and a tail flue, wherein the high-temperature vortex burnout device is arranged at an upper outlet of the hearth; the cyclone pulverized coal burner is arranged on the front and rear walls or the left and right walls on the lower part of the hearth in a hedge mode; the transition chamber is arranged on the rear part of the high-temperature vortex burnout device; the inlet of the convection flue is connected with the rear part of the transition chamber; the outlet of the convection flue is connected with the tail flue. According to the device, the defect that the organizing combustion effect in a short and small space of an industrial boiler is not ideal is overcome.

The invention discloses a method for converter steelmaking by using a small-particle grade high-basicity sintered ore. The method comprises the steps of adding waste steel and molten iron into a converter; blowing gas into the converter, and after the success of blowing ignition, adding lime, light burned dolomite, magnesite balls and a high-basicity sintered ore of which the particle size is 3-5mm and the basicity is 2-3 into the converter sequentially by using an overhead bunker; stopping blowing when end-point components and temperature of molten steel meet requirements; turning down the converter to ensure that the molten steel flows into a ladle, and adding a deoxidizing agent; casting the molten steel. The high-basicity sintered ore has a trend of increasing oxygen, can be used as a latent solvent, can cool a molten pool after being heated and reduced and is tiny and lightweight, so that the sintered ore can float in slag easily, can increase the content of ferric oxide in the slag and improve blowing slag melting conditions, and is favorable for slag melting; the method can improve the recovery rate of metals and reduce the consumption of oxygen, the consumption of steel and iron materials of a steel plant and the production cost. The basicity and the MgO content of a sinter returned ore are higher than those of an iron ore, so that a furnace liner can be better protected, and the furnace age of the converter can be effectively prolonged.

The invention relates to a stove used stalk shaped charcoal which uses stalk charcoal as main material and adds clogging extraction charcoal agent and is formed by mechanism agent pressing. It is a stalk charcoal which is made by stalk as main material in the field of renewable sources of energy.

The invention provides a surging molten iron slag-off method. Two air injection guns are perpendicularly inserted into molten iron from the top of a molten iron tank. The interval between the two guns is 1/2 of the radius of a tank opening, the insertion positions are located at the points 1/2 of the radius of the tank opening, and the insertion depth ranges from 0.5 m to 2.5 m; the air supply intensity is controlled to be larger than or equal to 2 NL/(min t) and the pressure is larger than 0.7 MPa; the air supply intensity of the air injection gun A is controlled to be 2 NL/(min t), the air supply intensity of the air injection gun B is gradually increased till the molten iron boiling exposed face makes contact with the wall of the molten iron tank, the air supply intensity of the air injection gun A is adjusted to be the same as that of the air injection gun B till the area of the molten iron boiling exposed face is larger than 1/2 of the tank opening of the molten iron tank, and therefore slag-off operation is started; after slag-off operation is finished, the air injection guns are pulled out of the molten iron and inject air continuously for over 30 s; and hoist cranes are used for lifting the air injection guns, so that locating pins are away from locating holes from 190 mm to 210 mm, the hoist cranes are transversely moved till the interval between the two guns reaches the length of the radius of the tank opening and then the hoist cranes fall, and the locating pins fall into new locating holes. By the adoption of the surging molten iron slag-off method, slag-off time can be shortened and iron loss and the converter resulfurization amount generated in the desulfuration slag-off process can be effectively reduced.

The invention discloses a blending method for power station pulverized coal boiler safe burning ramsbottom coke. The blending method for the power station pulverized coal boiler safe burning ramsbottom coke comprises the following steps that 1, ash softening temperature ST of the ramsbottom coke and a coal sample is measured; 2, erosion wear index Ke of the ramsbottom coke and the coal sample is measured; 3, with the total weight of coal used for burning as a benchmark, the ramsbottom coke and the coal sample are blended by the weight percentage to obtain the premixed coal after being blended; 4, grading is performed on the wear property of the premixed coal according to the erosion wear index Ke; 5, on the basis of the step 3, according to the erosion wear index Ke value obtained by measuring in the step 2, the erosion wear index Ke of the premixed coal after the ramsbottom coke and the coal sample are blended is converted, the final ramsbottom coke blending proportion is determined by combining with the grade of the wear property of the premixed coal, and finally, the mixed coal with determined blending proportion is fed into a boiler for burning. According to the blending method for the power station pulverized coal boiler safe burning ramsbottom coke, the power station pulverized coal boiler safe burning ramsbottom coke is achieved through the blending of the coal sample and the ramsbottom coke of different slagging properties and erosion wear properties.

The invention relates to a method for producing iron beads at the low temperature through dust of an iron and steel plant. The method has high adaptability to raw materials, can utilize dust generated during different processes of the iron and steel plant, and carries out matching according to basic physical properties of the raw materials. One or more kinds of dust is evenly mixed with a reduction agent, an adhesive agent and a fluxing agent, then the mixture is pressed into cold solidified pellets, the pellets are subjected to reduction, smelting and slag-iron separation in a rotary hearth furnace, and accordingly iron beads with a low metallization ratio and low-iron slag are obtained. The method mainly includes the two steps that the self-reduced dust pellets are prepared through raw materials such as dust and the fluxing agent, and the dust pellets are smelted by the rotary hearth furnace at the low temperature to produce iron beads. The problem that melt separation is difficult as self-reduced dust pellets are high in melt separation temperature, harmful ingredient content and slag amount is solved.

The invention discloses a high-performance slag collecting agent which is prepared from the following components: clay, modified perlite, straw ash, forsterite powder, pottery clay powder, zeolite powder, sepiolite powder, mullite powder, hollow glass microsphere powder, pyrophillite powder and palygorskite powder. The slag collecting agent provided by the invention resists high temperature, has favorable heat-resistance and thermal-insulation effects, keeps a nodulizing process stable, has high slag removal efficiency and does not affect the components of molten iron; iron slag is fragile after being cooled, so that the iron slag is convenient to recover and the loss of the molten iron is can be reduced; and the slag collecting agent can change the form of desulfurized slag to reduce the slag content of the molten iron entering a converter and the phenomenon of molten iron resulfurization, the loss of iron is reduced by an average of 48%, and on average, the desulfurized molten iron contains about 0.061% of sulfur.

The invention provides a coal ash component prediction method and device and a terminal. The method comprises the following steps: acquiring coal parameters of target coal, wherein the coal parameters comprise coal components, coal shapes and coal quantity; obtaining combustion parameters of the target coal, wherein the combustion parameters comprise the combustion mode, the combustion duration, the primary air volume and the opening degree of a secondary air baffle; inputting the coal parameters and the combustion parameters into a trained component prediction model to obtain coal ash components of coal ash generated after the target coal is combusted under the combustion parameters, wherein the component prediction model is a BP neural network, and the coal ash components comprise mass fractions of various metal oxides in coal ash. According to the method, the coal ash component after coal combustion is predicted through the BP neural network, and the coal ash component can be determined before coal combustion, so that the coal ash component can be changed by adjusting the combustion parameters of coal, and the slagging and coking phenomena of the water cooling wall of the tail flue of the power station boiler are improved.

The invention discloses a preparation method of a biomass granular fuel with a high combustion performance. The preparation method comprises the following steps: loading iron oxide on peat by an in-situ method to form a peat-iron oxide composite material, mixing the peat-iron oxide composite material with rosin emulsion, drying, pulverizing, mixing the obtained peat-iron oxide composite material with a biomass main material and an anti-slagging agent according to a proper ratio, and granulating to obtain the biomass granular fuel with high combustion performance. The biomass granular fuel hasthe advantages of being high in combustion rate, high in heat value, complete in combustion and not prone to slagging, and the combustion performance is remarkably improved.

The invention discloses a composite additive for improving the slagging and ash falling characteristics of Zhundong coal and an application method thereof. The composite additive is composed of an expansion type additive--vermiculite, a silica-alumina type additive--kaolin or silicon powder, and a desulfurizing agent--magnesium oxide. The composite additive comprises the following components by mass: 15%-60% of vermiculite and 30%-60% of kaolin or silicon powder, with the balance being magnesium oxide. In the composite additive of the invention, vermiculite is used as an expansion type additive, has good thermal stability and strong gas adsorbing ability, and exerts certain auxiliary sodium fixation and sulfur fixation effect; through the addition of vermiculite, ash becomes loose and porous and is thus easy to remove, so the vermiculite is an additive with excellent anti-slagging properties; silicon powder and kaolin can increase an ash melting point and fix sodium; and magnesium oxide can play the role of desulfurization.