391 results about "Calcium carbide" patented technology

The invention relates to the technical field of solid waste treatment, in particular to a cementing material as well as a preparation method and application thereof. The invention provides a preparation method of a cementing material, which comprises the following steps: S1, adding water into waste incineration fly ash, electrolytic manganese residue and carbide slag, and carrying out mechanical activation to obtain mixed slurry; s2, after the mixed slurry is subjected to pouring forming, curing is conducted, and a cementing material is obtained; the doping amount of the carbide slag accounts for 5-10 wt% of the total mass of the waste incineration fly ash, the electrolytic manganese slag and the carbide slag solid. According to the method, the waste incineration fly ash, the electrolytic manganese residues and the carbide slag are subjected to mechanical activation and synergistic treatment, self-cementation solidification is achieved in an alkaline environment provided by the carbide slag by utilizing the complementary effect of potential gelation activity of aluminosilicate in the electrolytic manganese residues and calcium-rich substances in the waste incineration fly ash, traditional excitants such as cement and lime do not need to be additionally added, and the cost is reduced. The dependence on additional raw materials is obviously reduced, and an effective solution is provided for recycling of a large amount of solid wastes.

The invention discloses a carbide slag fly ash concrete aerated block and a preparation method thereof, and belongs to the technical field of resource utilization of building materials and solid waste. The aerated block comprises the following raw materials: carbide slag, fly ash, gypsum, Portland cement, aluminum powder paste, a nano core-shell structure calcium-aluminum-silicon polymer and a zwitterionic foam-stabilizing polymer, the raw materials have a specific weight part range. Wherein the nano core-shell structure calcium-aluminum-silicon polymer is prepared by dispersing fly ash in water to form slurry, reacting the slurry with sodium silicate and a sodium metaaluminate solution in sequence, then adding calcium nitrate and a zinc sulfate solution for continuous reaction, and carrying out separation, washing, drying and grinding; the zwitterionic foam-stabilizing polymer is prepared by polymerizing a monomer in a solvent, precipitating and separating out, quaternizing, activating carboxyl crosslinking, dialyzing and purifying, and freeze-drying. All the steps relate to process parameters such as dry mixing time, stirring time, curing temperature, pressure and time, and the performance of the aerated block is improved through component optimization and preparation process improvement.

The invention belongs to the field of industrial waste treatment and comprehensive utilization, and provides a method and a process for preparing a heavy metal polluted acidic wastewater purifying agent by coupling red mud with carbide slag, and the process comprises the following steps: S1, raw material pretreatment: respectively drying original red mud and carbide slag at 105 + / -5 DEG C to constant weight, crushing, and sieving with a 100-mesh sieve; s2, mixing: uniformly premixing the red mud and the carbide slag powder in proportion, mixing the mixture with a binder in proportion, and uniformly stirring; s3, activating: slowly spraying a proper amount of water into the uniformly mixed dry powder, and stirring while adding until the material forms a wet block mass with certain plasticity; s4, granulation: feeding the wet material into a granulator with the granulation particle size of 2-5 mm, and aging the raw material particles at room temperature for 12-24 hours; and S5, drying and activating: drying the aged particles at 105-120 DEG C until the weight is constant, cooling to room temperature, and sieving to obtain the purifying agent product. The method has the effects of being high in heavy metal removal rate, stable, safe and efficient.

The present application relates to a kind of small square billet sulfur titanium-containing welding wire steel and its preparation method, belong to the technical field of steelmaking.The converter smelting process, refining process and continuous casting process, specifically are as follows:in the converter smelting process, tapping is carried out using aluminum block, ferrosilicon, silicon manganese deoxidation alloying, pre-slagging is carried out by adding lime, after tapping is finished, the total mass content of FeO and MnO in slag is controlled≤2.5%;In the refining process, lime, calcium carbide and aluminum particles are added for slagging and diffusion deoxidation, after slagging is finished, the slag basicity is controlled to be 2.5~3.0, the total mass content of FeO and MnO in slag is≤0.5%, the total oxygen content of molten steel is≤10ppm, sulfur wire and titanium wire are accurately fed;In the continuous casting process, the inclusion is controlled to gather in the stopper head and the water gap bowl by stopper shaking method, and the basicity of protective slag is controlled to be 0.85~0.95.The sulfur titanium-containing welding wire steel prepared by the above method.The present application solves the problems of small square billet sulfur titanium-containing welding wire steel surface slag inclusion, intermediate crack and water gap nodule.

The invention discloses a method for synthesizing a platinum-based nitrogen-doped graphdiyne catalyst based on an atomic layer deposition technology and application of the platinum-based nitrogen-doped graphdiyne catalyst. Firstly, hexabromobenzene and calcium carbide are subjected to vacuum ball milling, calcination and purification to obtain a graphdiyne carrier, then the graphdiyne carrier and melamine are mixed and calcined to achieve nitrogen doping of the carrier, and then loading of platinum nanoparticles is accurately controlled through an atomic layer deposition technology. According to the method, the characteristics of an atomic layer deposition technology are utilized, deposition parameters and the number of cycles are controlled, uniform distribution and size control of Pt nano-particles on porous graphdiyne are achieved, and a nitrogen-doped graphdiyne carrier and the platinum nano-particles have a synergistic effect. The platinum-based nitrogen-doped graphdiyne catalyst prepared by the invention has the specific surface area of 734.8 m < 2 > g < 1 > and the average pore size of 8.68 nm, and shows excellent electrocatalytic activity and dynamic performance in reaction.

The invention relates to the technical field of comprehensive utilization of solid wastes, and discloses a preparation method of a high-performance cement-based grouting anti-seepage slope-fixing material based on waste slag, which comprises the following steps: obtaining carbide slag and desulfurized gypsum, mixing and grinding to obtain a superfine low-hardness composite activator; independently grinding the granulated blast-furnace slag to obtain hard superfine slag powder; putting the superfine slag powder and the composite exciting agent into high-speed powder modification equipment according to a specific proportion, and driving the composite exciting agent to plastically deform and mechanically embedded into surface defects of the superfine slag powder by utilizing impact kinetic energy provided by linear speed and Mohs hardness difference of the superfine slag powder and the composite exciting agent, so as to form core-shell structure composite particles with mechanical interlocking interfaces; according to the invention, by constructing a mechanical chimeric core-shell structure, space-time decoupling of high rheological property in a slurry construction period and high strength in a hardening period is realized.

The utility model discloses a system for producing sodium carbonate by using carbon dioxide and carbide slag in boiler flue gas, which is characterized in that the boiler flue gas discharged by a coal-fired boiler is purified and then enters a carbonization tower instead of part of lime kiln gas to react with ammoniacal salt water to generate NaHCO3, the NaHCO3 is calcined to generate a final product sodium carbonate, carbon is fixed to the final product, and the emission of CO2 is reduced; and meanwhile, the consumption of CO2 generated by calcining the limestone is reduced, so that the consumption of the limestone and the coke is greatly reduced. Calcium carbide slag generated by a calcium carbide method PVC production device is ground and screened to obtain coarse powder, fine powder and superfine powder, the coarse powder, the fine powder and the superfine powder are mixed in proportion to obtain a calcium carbide slag powder mixture with reasonable grain size distribution, the mixture is used for preparing lime milk, lime milk meeting the ammonia distillation requirement of a sodium carbonate system can be prepared without adding quick lime, the lime milk is used for the ammonia distillation system, and the production cost is reduced. Lime milk notches caused by reduction of lime yield are supplemented, and meanwhile, the utilization value of the solid waste carbide slag is improved.

The invention relates to the technical field of calcium carbide furnaces, and discloses an intelligent regulation and control system for a closed arc smelting furnace of an industrial silicon electric furnace. By integrating multiple types of sensors including electrical parameters, sound pressure frequency spectrum, infrared thermal image, feed opening vision and the like and adopting a data fusion algorithm, the application can analyze the condition in the furnace from multiple angles, especially through voiceprint recognition and thermal image analysis; state changes, which cannot be quickly sensed, of traditional electrical parameters such as a'micro-open arc ', a'local sintering' and a'material collapse precursor 'can be sensitively captured in an early stage, a data basis is provided for subsequent regulation and control, and timely regulation and control can be further facilitated. The control of each mechanism is performed based on the same intelligent decision, and the decision of the operator is recorded and fed back to the knowledge base under the situation of combined use with the man-machine collaborative intervention interface, so that the dependence on the original single fixed operation experience is gradually reduced, and the user experience is improved. And a cooperative control scheme for a plurality of control terminals is gradually improved and converted.

The utility model relates to gas purification technical field especially is a calcium carbide method acetylene gas purification device, including washing tower, circulating pump, cooler and collector, the one side lower extreme of washing tower is installed for the acetylene pipe of air inlet, the top of washing tower is installed for the first connecting pipe of air outlet, the other end of first connecting pipe is connected in the one side lower extreme of cooler, and the other side of cooler is installed for the heat exchange pipe of cooling use, the top of cooler is installed with second connecting pipe, and the other end of second connecting pipe is installed with collector, and the top of collector is installed with the air pipe, in the utility model, integrated acetylene gas purification process, after entering washing tower, acetylene gas is fully washed through the multistage shower nozzle structure of inside back type setting, can effectively remove the alkali liquor and small impurities of entrainment, improve gas quality, and the cooler of cooperation setting can further reduce gas temperature and moisture content, improve the stability of subsequent reaction.

The invention relates to an extraction agent and an extraction method, and relates to the technical field of wet extraction of industrial solid waste, and the extraction agent comprises the following components in parts by mass: an extraction main agent, an anti-impurity stabilizer and an extraction aid; the extraction main agent comprises di (2-ethylhexyl) phosphate and mono (2-ethylhexyl) phosphate, the impurity-resistant stabilizer comprises an imidazoline derivative, a triazine derivative and dimethyl methylphosphonate, and the extraction assistant comprises isooctyl alcohol; the extraction method comprises the steps of ash ball preparation, impurity removal, extraction and the like. According to the extraction agent and the extraction method, interference impurities such as trace heavy metal ions, sulfides and cyanides generated due to component fluctuation in the purified ash of the calcium carbide furnace are selectively chelated, the impurities are prevented from being combined with the extraction main agent, and then the anti-interference stability of the extraction agent under the condition that the impurity content of the purified ash of the calcium carbide furnace fluctuates is improved; and the control difficulty in the production process is reduced.

A smelting wire (11) comprising a metal sheath (12) enclosing a core (14) containing a refining material (14), the refining material (14) comprising calcium carbide, the calcium carbide being located at or near the center of the core along at least a portion of the length of the core.

The application relates to an aerated concrete prepared from granite waste rock powder and a preparation method thereof. The aerated concrete of the application takes granite waste rock powder (skeleton effect), calcium carbide slag (calcic material), clay (sintering promotion), red mud (gel filling) and coal gangue (siliceous material) as core raw materials, replaces traditional natural sandstone and lime, realizes industrial solid waste resource utilization, conforms to the development direction of green building materials, and significantly reduces the dependence on natural resources.

The application discloses a quaternary solid waste-based soil stabilizer (GSCP) for a base layer, which is composed of slag (GGBFS), steel slag (SSA), calcium carbide slag (CS) and phosphogypsum (PG) and has a weight ratio of GGBFS:SSA:CS:PG=56:24:12:8. The stabilizer forms C-S-H colloid and ettringite (AFt) through alkaline activation and sulfate activation, does not need to add cement or chemical activator, is used for stabilizing silty clay and steel slag mixed soil, and significantly improves the unconfined compressive strength, splitting tensile strength, water stability and freeze-thaw resistance. Compared with a traditional cement-based stabilizer, the application reduces carbon emission by 82% and cost by 31.25%, provides a low-carbon and economical solution for road engineering, and is suitable for the base layer and the subbase layer of a secondary road or above.

This invention relates to the field of fire prevention and extinguishing technology in goaf areas, and proposes a fire prevention and extinguishing material and method for goaf areas. The fire prevention and extinguishing material comprises the following raw materials in parts by weight: 60-80 parts water, 50-60 parts fly ash, 15-25 parts calcium carbide sludge, 5-10 parts polyethylene glycol, 10-20 parts polyacrylamide, 15-20 parts flame retardant, and 2-8 parts imidazole ethanol. This technical solution solves the problem of poor flame retardancy and protective properties of existing goaf fire prevention and extinguishing materials.

The utility model relates to a carbide slag dry powder anti-blocking device in the technical field of carbide slag. The carbide slag dry powder anti-blocking device comprises a storage bin, a discharging pipe is arranged at the bottom of the storage bin, a stirring assembly is arranged at the joint of the discharging pipe and the storage bin, and a drying assembly is arranged in the discharging pipe below the stirring assembly. The stirring assembly comprises a horizontal rotating rod, one end of the horizontal rotating rod extends out of the discharging pipe and is connected with a first stepping motor, a plurality of stirring rods are fixed to the horizontal rotating rod, the drying assembly comprises an air distribution ring, the air distribution ring is fixed to the inner wall of the discharging pipe, air spraying holes are evenly distributed in the inner ring face of the air distribution ring, and the air distribution ring is connected with an air inlet pipe. According to the utility model, crushing can be carried out when carbide slag dry powder in the storage bin blocks the discharge pipe, the discharge pipe is prevented from being blocked, and when the discharge pipe is not blocked, the stirring assembly does not work, so that energy is saved; and meanwhile, the dry powder can be dried, blockage caused by caking of the dry powder due to high humidity during pneumatic transportation is avoided, the dry powder transportation efficiency is improved, and subsequent production is facilitated.

The utility model relates to the field of acetylene production, in particular to an acetylene production electric stone feeding device which comprises an external frame, four sets of lifting lugs are fixedly connected to the top end of the outer wall of the external frame, a storage barrel is arranged on the side wall of the inner side of the external frame, a vibration mechanism is arranged on the side wall of the inner side of the external frame, and the vibration mechanism is arranged on the side wall of the outer side of the external frame. A degradation assembly is arranged on the inner wall of the bottom end of the external frame, a support is fixedly connected to the side wall of the inner side of the external frame, a limiting assembly is arranged on the inner wall of the support, a hinge rod is hinged to the outer wall of a protruding block of a sliding block A, and a sliding block B is hinged to the end, away from the sliding block A, of the hinge rod. According to the calcium carbide discharging device, the contact block is driven by the double-shaft motor to rotate, so that the storage barrel moves up and down in a reciprocating manner, calcium carbide is prevented from being blocked at the discharging port, the discharging smoothness is ensured, the production efficiency is improved, meanwhile, the calcium carbide is uniformly discharged under the vibration action, and the production stability is improved.

This invention discloses a method for preparing green heating fuel from fish farming waste, comprising the following steps: (1) mixing papermaking sludge with acidic electroplating solution, sealing the mixture, and then heat-insulating it; after completion, drying and grinding the obtained solid product to obtain modified papermaking sludge powder for later use. (2) draining the water from the fish farming waste filtered out, then mixing the obtained wet material with calcium carbide powder and the modified papermaking sludge powder, stirring the mixture, and collecting the gas generated during the reaction; after the reaction is completed, sealing the obtained solid product and allowing it to stand to obtain a modified fuel matrix for later use. (3) mixing the modified fuel matrix with molasses and pressing it into granules to obtain the green heating fuel. The method of this invention not only converts fish farming waste into high-value biomass fuel, but also significantly reduces the energy consumption caused by the moisture in the dried waste.

The invention relates to a pellet and a preparation method thereof, and relates to the technical field of calcium carbide preparation, the pellet comprises the following components in parts by mass: 5.2-8.3 parts of calcium carbonate crystal, 56.8-59.7 parts of calcium oxide, 32.0-37.5 parts of calcium hydroxide, and 0.6-0.9 part of carboxylation modified lignin; the preparation process comprises the steps of raw material pretreatment, mineralization slurry preparation, mineralization and curing. According to the pellet and the preparation method, the active lime screen underflow serves as a calcium source, a stable structure with high strength and multistage pores is constructed on the molecular scale by adopting the biomimetic mineralization principle, and the pellet cracking risk is effectively reduced; meanwhile, an inert binder does not need to be added, effective calcium content dilution is avoided, the high-temperature smelting working condition of the distribution stone is adapted, and the production cost is remarkably reduced.

This invention discloses a method for reducing the arsenic and tin content in nickel-based alloy materials. Specifically, in the electroslag remelting process during the preparation of nickel-based alloy materials, a pre-melted slag with the following composition is used: CaF2: 38%–45%, CaO: 20%–25%, Al2O3: 20%–30%, ZrO2: 3%–5%, BaF2: 3%–5%, MgO: 1%–3%, SiO2: 1%–3%, with the remainder being unavoidable impurities; the CaO / Al2O3 ratio in the pre-melted slag is 0.8–1; the pre-melted slag also contains 1–1.5% calcium carbide powder in total slag. Using this method, the arsenic and tin removal rate in nickel-based alloy materials can reach over 46%, effectively solving the problem of difficult arsenic and tin removal in nickel-based alloys. This avoids the impact of As and Sn accumulation on product quality during recycling, creating conditions for the reuse of nickel-based alloy recycled materials.

The application discloses a desulfurization system and method for preparing a saline-alkali soil modifier from calcium carbide slag desulfurization slurry, and relates to the technical field of desulfurization systems. The desulfurization system comprises a desulfurization tower, a slurry circulating pool is arranged at the bottom of the tower body, an acidification air inlet and an acidification air outlet are arranged on an inlet flue, a suspension separation box is arranged, the box body is internally provided with a liquid discharge port at the bottom and an air outlet at the top, the liquid discharge port is connected with the slurry circulating pool through a slurry discharge pump, the air outlet is connected with the acidification air outlet on the inlet flue through an acidification air blower, a stirrer, an acidification air pipe network and a slurry injection pipe network are sequentially arranged in the box body from bottom to top, and a gypsum box is arranged and internally provided with a stirrer; process water and solid gypsum particles in the gypsum box form countercurrent contact. The application can effectively remove high-concentration chlorine ions, heavy metals, silicon oxides, aluminum oxides and other special impurities in the calcium carbide slag desulfurization slurry, and the prepared desulfurization gypsum can be used for saline-alkali soil improvement.

The utility model provides a calcium carbide gas generation amount measuring device which comprises a gas generation tank, a feeding part, a gas inflation part and a detection part, a sealing cavity is formed in the gas generation tank, the feeding part, the gas inflation part and the detection part are connected with the gas generation tank, the feeding part is used for adding reaction raw materials into the sealing cavity, the gas inflation part is used for introducing flame-retardant gas into the sealing cavity, and the detection part is used for detecting the gas generation amount of calcium carbide. The detection part is used for acquiring environmental parameter information in the sealing cavity; the reaction raw materials comprise calcium carbide and reaction liquid, and the environmental parameter information comprises pressure information and temperature information. By arranging the feeding part, reaction raw materials can be fed into the sealing cavity. By arranging the detection part, the environmental parameters in the sealing cavity can be obtained, a reliable data basis is provided for calculating the gas evolution amount of calcium carbide, and the gas evolution amount of calcium carbide can be obtained more accurately and safely. The flame-retardant gas is introduced into the sealing cavity through the inflating part, so that air in the sealing cavity is replaced, acetylene is prevented from being mixed with the air, the explosion risk is reduced, and the operation safety is guaranteed.

This invention discloses a method for potassium resource recovery from purified ash residue in calcium carbide production, comprising the following steps: crushing the purified ash residue from calcium carbide production, adding a certain amount of solvent to dissolve potassium ions and adjusting the alkalinity of the solution to retain high-valence calcium and magnesium ions in the ash residue; conducting a leaching reaction on the calcium carbide production ash residue through countercurrent circulation to significantly increase the potassium concentration in the leaching solution; adjusting the alkalinity of the potassium-rich solution and adding a functional extractant to perform ion exchange with potassium ions; loading the potassium extractant and separating it through an acidification reaction to obtain a potassium salt solution, which is then obtained by evaporation and crystallization to obtain solid potassium salt. The method of this invention can not only effectively extract potassium from purified ash residue from calcium carbide production, but also obtain potassium salts that meet industrial-grade standards. Furthermore, the method is simple, easy to operate, and readily scalable for industrial production.

The invention discloses a preparation method of an all-solid-waste building material, which comprises the following steps: S1, raw materials of the all-solid-waste building material comprise steel slag, lithium slag, carbide slag and water according to a mass ratio of (11-13): (4-6): 1: (2-4); s2, uniformly mixing and stirring the raw materials in the S1, casting and molding, curing for 2-3 days in an environment with the temperature of 15-25 DEG C and the humidity of 45-55%, and demolding; and S3, after demolding, carrying out carbonization maintenance in an environment with the temperature of 15-25 DEG C and the humidity of 45-55% to obtain the all-solid waste building material. According to the all-solid-waste building material and the preparation method thereof, the steel slag, the lithium slag and the carbide slag are adopted as raw materials, the building material with the strength reaching up to 30 Mpa is prepared, it is guaranteed that the compressive strength is not smaller than 24.3 Mpa, meanwhile, it is guaranteed that the drying shrinkage rate is smaller than 0.29%, the sulfate erosion resistance expansion rate is smaller than 0.07%, and the all-solid-waste building material can replace baking-free bricks to be used in buildings.

The utility model belongs to the technical field of calcium carbide, and relates to an automatic calcium carbide unloading and crushing system which comprises an engineering dumper, a small calcium carbide hopper and an engineering manipulator. A grating plate connected with the inner wall of the small calcium carbide hopper is arranged in the small calcium carbide hopper and located on the cross section of the small calcium carbide hopper. A conical tip is arranged on the grating plate, and the tip end of the conical tip faces upwards; and the engineering dumper and the engineering manipulator are respectively arranged outside the small calcium carbide hopper and are positioned above the grating plate. The utility model provides an automatic calcium carbide unloading and crushing system, which realizes automatic unloading and crushing, improves the field operation environment, ensures the personnel safety and improves the stability and continuity of production operation.

The invention relates to the technical field of calcium carbide furnace gas wastewater treatment, and discloses methanol raw material calcium carbide furnace gas cyanide-containing wastewater treatment equipment and process, and the equipment comprises a water inlet tank, a first pH adjusting tank, a cyanide removal reaction tank, a flocculation tank, a sedimentation tank, a second pH adjusting tank, a water outlet tank and a mud bucket; a water inlet of the first pH adjusting tank is connected with a water outlet of the water inlet tank, the first pH adjusting tank, the cyanogen removal reaction tank and the flocculation tank are sequentially connected in series, a water inlet of the sedimentation tank is connected with a water outlet of the flocculation tank, and a water inlet of the second pH adjusting tank is connected with a water outlet of the sedimentation tank; the mud bucket is detachably connected to the bottom of the sedimentation tank. The ferrous salt is added into the cyanogen removal reaction tank to react with cyanide in the wastewater to generate the floc, the floc is separated from water through a precipitation method so as to reduce the cyanogen content of the wastewater, the pH value of the alkaline wastewater can be adjusted through backflow of the acid wastewater, no additional acid liquor needs to be added, consumption can be reduced, and the wastewater utilization rate can be increased.

This utility model relates to the technical field of calcium carbide furnace equipment and discloses a novel anti-clogging feeding device for calcium carbide furnace hoppers. It includes a support frame, a feeding hopper on the inner side of the support frame, and an anti-clogging mechanism at the bottom of the feeding hopper. The anti-clogging mechanism actively pushes away blocked raw materials. A vibration mechanism is installed inside the feeding hopper to loosen the blocked raw materials. The anti-clogging mechanism includes a discharge channel, the top of which is fixedly connected to the bottom of the feeding hopper, and a fixed base is fixedly connected to the top of the outer side of the discharge channel. In this utility model, an infrared sensor detects material flow. When a blockage is detected, a hydraulic rod extends and retracts, causing a lifting block to move, which in turn moves a push rod within the discharge channel. After clearing the blockage, the hydraulic rod resets, achieving real-time monitoring and active clearing of blockages in the discharge channel. This effectively prevents and resolves blockage problems, avoiding calcium carbide furnace shutdowns due to material shortages.

The application relates to the technical field of secondary battery material preparation, and discloses a preparation method of a hard carbon composite material, the hard carbon composite material and application. The preparation method of the hard carbon composite material comprises the following steps: S1, heating sodium chloride to melting, adding calcium carbide, metal oxide or sulfide, mixing uniformly, introducing carbon dioxide, and carrying out reaction to obtain a hard carbon precursor material; and S2, transferring the hard carbon precursor material to a container, introducing inert gas, and then introducing natural gas and bromide gas in sequence to modify, so as to obtain the hard carbon composite material. Through the technical scheme, the problem of poor battery performance of the hard carbon material prepared in the prior art is solved.

According to the smelting process, EBT electric arc furnace smelting, LF furnace refining, VD vacuum treatment and continuous casting are adopted, the end point C of an electric arc furnace ranges from 0.08% to 0.25%, and the end point temperature is controlled to range from 1630 DEG C to 1660 DEG C; 5-7 kg / t steel lime and 1.0-2.0 kg / t steel calcium carbide are added into an LF furnace for deoxidation, a staged sulfur adding technology is adopted, the alkalinity of refining slag is controlled to be 2-4, reducing white slag is not produced for desulfurization, the temperature is increased to 1655-1685 DEG C in a submerged arc mode, VOD / VD is converted for vacuum treatment, a vacuum refining technology is adopted in VD, the vacuum degree is smaller than or equal to 67 Pa, the holding time is longer than or equal to 20 min, sulfur line feeding is not conducted after VD, and calcium treatment is not conducted; and when the soft blowing time is greater than or equal to 12 minutes, a continuous casting station is turned, the superheat degree of a continuous casting tundish is controlled to be 20-50 DEG C, and the constant pulling speed is 0.20 + / -0.2 m / The technology is suitable for producing the low-silicon low-aluminum high-sulfur steel through the electric furnace in a short process.

The present application relates to steel and non-ferrous smelting slag comprehensive recovery and iron-making resource utilization comprehensive utilization technical field, disclose a kind of copper slag efficient iron-making method based on magnetic separation pretreatment, comprising: to molten iron-silicate base waste slag input by calcium carbide, sodium fluoride and phosphorus component consisting of conditioning agent, using sodium fluoride to build liquid diffusion field exposure reduction interface, induce calcium carbide and iron silicate in situ reduction to generate metal iron core;Heat treatment promotes iron core polymerization growth;Gradient cooling, using phosphorus component induces silicate matrix crystal transformation to generate expansion stress and break matrix;Grinding powder and weak magnetic separation, extract magnetic enrichment product, the present application breaks iron-oxygen-silicon chemical bond, realizes the conversion of combined state iron to independent metal state, achieves iron and gangue phase decoupling, using endogenous stress induction self-pulverization, reduce grinding energy consumption, output high-grade iron powder and simultaneously remove sulfur zinc impurities.

The utility model belongs to calcium carbide furnace technical field discloses a calcium carbide furnace electrode length measuring device, including round steel, still include: drive assembly, drive assembly is used for driving round steel along with the horizontal plane 30 degree inclination angle and sends into calcium carbide furnace, and make round steel's free end and electrode contact; Voltage induction box, voltage induction box and round steel's other end electric connection, be used for receiving round steel's voltage signal; The scheme through drive assembly will round steel along 30 degree inclination angle and send into calcium carbide furnace, when round steel free end contacts electrode, the voltage signal between electrode and furnace body will be transmitted to voltage induction box through round steel, combine the fixed vertical distance parameter of calibration before firing, utilize the horizontal distance of measurement hole to electrode of trigonometric function calculation, deduce electrode actual length; The utility model solves the problem of measuring electrode length under the condition of not power failure of calcium carbide furnace.