24results about How to "Less slag" patented technology

The recovery method of the laterite-nickel ore leaching residues comprises the following steps that S1, in the presence of a first reducing agent, the laterite-nickel ore leaching residues are roasted, and roasted sand and sulfur-containing tail gas are obtained; s2, in the presence of a second reducing agent, smelting the roasted product obtained in the step S1 to obtain molten iron, smelting slag and coal gas; the laterite-nickel ore leaching residues are in a dry state; the smelting slag is a MgO-Al2O3-SiO2-FeO slag system, and the smelting slag is a MgO-Al2O3-SiO2 The ratio of the total mass of fixed carbon in the first reducing agent to the total mass of sulfur in the laterite-nickel ore leaching residues is 0.35-0.50. According to the recycling method, iron and sulfur in the laterite-nickel ore leaching residues can be comprehensively recycled under the condition that extra flux is not needed, resource utilization of the laterite-nickel ore high-pressure leaching residues is achieved under the condition that the overall process cost is low, and large-scale industrial use is facilitated.

The invention relates to a slagging-off device for a copper alloy smelting furnace, a slagging-off spoon is controlled through a rotating and lifting device, the slagging-off device is provided with an air blowing pipeline, and the air blowing pipeline is integrated in a box body and specifically comprises an air tank, an air blowing pipe and a purging pipe. The purging pipe is communicated with the atmosphere and the air blowing pipe and sequentially comprises a purging valve, a single chip microcomputer, a vacuum pump, an air storage cylinder inlet, an air storage cylinder, an air storage cylinder outlet and an exhaust valve along an atmosphere circulation path. Nitrogen gas is continuously conveyed to the surface of the melt through the gas blowing pipeline, the oxygen concentration at the furnace opening can be reduced, slag generation is reduced, melt splashing is avoided, potential safety hazards can be reduced, and repeated slag generation is avoided.

The invention discloses a method for treating copper anode slime through combination of reduction smelting, vacuum distillation and oxidation refining. The method comprises the following steps: firstly, adding a reducing agent and a slagging constituent into tellurium slag obtained by removing copper, selenium and tellurium from copper anode slime by a conventional method, and uniformly mixing to obtain a mixed material; the obtained mixed material is added into a converter to be subjected to a heating reduction smelting reaction, and reducing slag and high-gold precious lead are generated in the converter; the method comprises the following steps: putting high-gold precious lead into a vacuum furnace for vacuum distillation, cooling after distillation, filling nitrogen for protection after cooling, and opening the vacuum furnace to discharge lead-bismuth alloy and residues when the pressure reaches the standard atmospheric pressure; and the obtained residues are placed in a refining furnace to be subjected to oxidation refining, and lead bismuth slag, tellurium slag, alloy slag and an alloy plate are generated. By means of the technical scheme, the direct recovery rate of precious metal is high, the field environment is good, the production cost is low, the additional value of by-products is high, and the technical problems existing in an existing copper anode slime treatment process can be effectively solved.

The invention discloses a method for reducing slag entrapment of a tundish in the steel ladle exchange process. The technical problem of slag entrapment in the steel ladle exchange process in the prior art is solved. The method comprises the steps that a first steel ladle stops pouring and ascends; the second steel ladle is placed above the tundish and gradually descends, and meanwhile air is blown to a long nozzle of the second steel ladle till the long nozzle of the second steel ladle is inserted into the position, below 280 mm-320 mm, of the liquid level in the tundish; the long nozzle of the second steel ladle is connected with a skimmer, the skimmer comprises a connecting section and a skimming section which are connected with each other, the connecting section is connected to the long nozzle, and the outer diameter of the skimming section is sequentially reduced from top to bottom; the sliding plate of the second steel ladle is opened, so that molten steel in the second steel ladle flows into the tundish through the long nozzle, and steel ladle exchange is completed; the air blowing amount under the condition that the insertion depth H of the long nozzle is not greater than 150mm is greater than that under the condition that the insertion depth H of the long nozzle is greater than 150mm, so that slag entrapment is reduced. According to the method, the slag entrapment amount of the molten steel can be reduced, the cleanliness of the molten steel is improved, and the stamping cracking rate of finished products is reduced.

The invention relates to the technical field of combustion agents and preparation processes thereof, in particular to a high-reaction-pressure silicon-based pyrotechnic composition and a preparation process thereof.The high-reaction-pressure silicon-based pyrotechnic composition is prepared from metal powder, metal fluoride, a gas generating agent and a binder; porous silicon powder is adopted as the metal powder, one or more of ferric fluoride and copper fluoride is adopted as the metal fluoride, ammonium perchlorate is adopted as the gas generating agent, and one or more of epoxy resin and polyether amine is adopted as the binder. When the high-reaction-pressure silicon-based pyrotechnic composition is prepared, silicon is used for replacing aluminum to serve as combustible metal, fluoride is used for replacing oxide, the boiling point of a reaction product is remarkably reduced and is far lower than that of aluminum oxide, and due to the fact that the boiling point of the reaction product is reduced, slag of the product is remarkably reduced.

The present invention discloses a metal flux-cored welding wire for laser cladding and a preparation method and application thereof, belonging to the field of additive manufacturing technology. The metal flux-cored welding wire for laser cladding is mainly used for preparing a coating on the surface of a hydraulic support that is resistant to chloride ion corrosion and coal particle wear. The metal wire for laser cladding of the present invention is a flux-cored welding wire, which belongs to a martensitic rust steel type material. By adding alloy elements that improve strength and toughness, the material has good corrosion resistance while having high hardness and plastic toughness, so that it can be prepared into a metal wire by drawing, and the prepared cladding layer can meet the requirements of the hydraulic support for the service environment.

The application discloses a method for preparing arsenic-cadmium alloy by using arsenic-cadmium acid waste liquid, and belongs to the technical field of wastewater treatment. The application realizes the selective precipitation of arsenic and cadmium in the form of Cd5H2(AsO4)4.4H2O with high purity and complete crystal form by precisely controlling the molar ratio of cadmium to arsenic in the waste liquid to be 1.2-1.6 and adjusting the pH of the precipitation to be 4-6, thereby realizing the deep removal of the two toxic elements of arsenic and cadmium, and the removal rate of arsenic can reach more than 96.70%, and the process flow is greatly reduced. The Cd5H2(AsO4)4.4H2O-based precipitation slag is converted into high-purity arsenic-cadmium alloy by carbon thermal reduction, the amount of slag is greatly compressed, and the storage and landfill of waste materials are significantly reduced. The alloy can be further used to prepare downstream products such as semiconductor materials as a high-value-added product, realizes the high-value conversion from harmful waste to high-end raw materials, and has remarkable green disposal and resource utilization benefits.

The utility model relates to a filtering device for preventing ash from transferring into a smelting furnace in the molten aluminum ladle process, which comprises a device body arranged at a ladle outlet, the device body is in a circular truncated cone shape and is hollow inside, and the bottom diameter of the device body is smaller than the upper diameter of the device body. An edge grille composed of a plurality of round bars is arranged between the bottom and the upper portion, the upper portion of the device body is open, a bottom grille composed of a plurality of round bars is laid at the bottom, and fixing lugs are arranged at the two ends of the upper portion of the device body. The device is placed in the two-man ladle, the fixing lug is flush with the bayonet of the two-man ladle cover, the stainless steel rod is inserted to lock the device, most impurities in the two-man ladle are isolated in the two-man ladle, the impurities are prevented from entering a smelting furnace along with molten aluminum, the content of the impurities in the smelting furnace is reduced, and the service life of the smelting furnace is prolonged. And secondary pollution to the molten aluminum caused by the fact that impurities in the molten aluminum are impacted by the molten aluminum to enter the melt in the transfer injection process is also reduced. The device is simple in structure, obvious in effect and convenient to use.

The invention relates to a method for separating and recovering arsenic and iron from biological leachate containing arsenic and iron, which comprises the following specific steps: adding an adsorbent into the biological leachate containing arsenic and iron, uniformly mixing, reacting, and separating solid and liquid after adsorption is completed to obtain an arsenic-iron solution without bacterial residues; adding a reducing agent into the obtained arsenic-iron solution, detecting that arsenic and iron are respectively converted into trivalent and bivalent, and completing the reaction to obtain a solution containing low-valent arsenic and low-valent iron; an extracting agent is added into the reduced arsenic-iron solution, an arsenic-containing organic phase and an iron-containing raffinate are obtained, the iron-containing raffinate is used for returning for biological leaching, the organic phase is subjected to reverse extraction, an arsenic-containing reverse extraction solution is obtained, and the organic phase obtained after reverse extraction is used for arsenic extraction again; and adding sodium hydroxide into the arsenic-containing strip liquor, uniformly mixing, adding benzyl chloride, stirring for reaction, standing for layering, adjusting acidity for crystallization, and washing and drying the crystal to obtain the benzyl arsonic acid product. The method overcomes the defects of large slag amount, difficulty in product purification, complex process, low arsenic and iron recovery rate and the like in the existing neutralization process, fully recycles arsenic and iron resources in the bioleaching liquid, and has the advantages of high recovery rate, large product additional value, no secondary pollution in the process, low investment and the like.

The invention discloses a method for improving blast furnace high-aluminum smelting slagging, relates to a metallurgical technology, and provides a scheme aiming at the problem that the amount of magnesian flux added into sintered ore in the prior art is limited. And adding a certain proportion of light-burned dolomite powder and injection coal powder, mixing, feeding into a mill for milling, and injecting into a blast furnace from a tuyere through a coal gun, wherein the powder with the granularity of-200 is 80-82%. The method has the advantage that the continuous high MgO requirement of the slag is easily realized by adjusting the injection mass ratio of the light-burned dolomite powder to 2-3%. The grade of the sintered ore is improved; slagging at the upper part of a blast furnace is improved; the bosh slag amount is reduced; and the air permeability of a material column is improved. And thirdly, the acid slag in the tuyere convolute area is quickly adjusted and balanced, the slag desulfurization effect in the continuous high-aluminum smelting process is met, and the molten iron components are favorably improved and stabilized.

The application discloses a kind of waste lithium ion battery powder leaching methods, it is related to battery recycling technical field.Adopting ferrous sulfate as leaching agent can leach the main metal and impurity except copper in battery powder under mild conditions;Utilize nickel-cobalt slag to reduce ferric iron, while improving the main metal concentration in feed liquid without introducing new impurities;Aluminum is removed by bicarbonate to obtain aluminum slag, there is still a small amount of ferric ion in the process of removing aluminum, under the synergistic effect of a small amount of ferric ion, the aluminum slag obtained in the aluminum removal process is regular round, the aluminum content in the slag is high, the slag amount is small, the solid-liquid separation speed is fast, and the metal loss rate is low;After positive electrode powder is oxidized by ferrous ion, iron is removed to obtain purified liquid.The process of the application is simple, low in cost and highly practical, and can efficiently leach valuable metals under mild leaching conditions, and the leaching agent can be recycled.

The invention discloses a smelting multi-pollutant wastewater treatment process, wherein the smelting wastewater is subjected to a process combination of sulfidation treatment, gypsum process, weight removal treatment, and defluorination treatment, wherein a sulfiding agent is added in the sulfidation treatment, lime is added in the gypsum process, lime, thallium removal agent, and defluorination and heavy metal removal multi-nuclear agent are added in the weight removal treatment, and defluorination and heavy metal removal multi-nuclear agent is added in the defluorination treatment, and a denitrification agent is added in two steps in the process, so as to achieve the simultaneous removal of heavy metals and non-metallic oxides in the smelting multi-pollutant wastewater. The smelting multi-pollutant wastewater treatment process is simple, has a good effect of simultaneous removal of multiple pollutants, and has considerable comprehensive benefits.

The utility model relates to the technical field of wastewater treatment, in particular to a wastewater treatment device, which is characterized in that a wastewater treatment flow is redesigned, alkaline wastewater enters acidic wastewater and is subjected to neutralization reaction in a three-stage treatment tank, so that the acidic wastewater containing Ca < 2 + > is always kept acidic, and the Ca < 2 + > cannot overflow in the form of a slightly soluble substance; and the amount of slag deposited in the clarification tank and the low-tungsten exchange column is naturally and greatly reduced, so that the labor intensity of workers is greatly reduced.

The present application belongs to the field of metallurgy, and discloses a method for removing arsenic, antimony and bismuth from crude copper, comprising the following steps: S1. Melting crude copper raw material to obtain molten copper liquid, and controlling the temperature of the molten copper liquid to be 1150-1250 DEG C; S2. Adding a slagging agent to the molten copper liquid, and introducing oxygen-containing gas to remove impurities from the molten copper liquid; first, maintaining the oxygen volume concentration at 0.1%-0.5%, adding a part of the slagging agent to react; then, increasing the oxygen volume concentration to 1.5%-3.0%, and adding the remaining slagging agent to react; wherein the slagging agent comprises an alkaline carbonate, an oxidizing agent and a crystal nucleus inducer; the oxidizing agent is sodium nitrate or / and potassium nitrate; S3. Allowing the molten copper liquid to be separated from the slag phase, and removing the slag to obtain refined copper liquid. The method can deeply remove arsenic, antimony and bismuth, and can reduce the amount of slag, and the slag system has good fluidity and is easy to separate, so that the copper purity is improved while the recovery rate is ensured.

The invention provides a method for synergistically smelting nickel-chromium stainless steel mother liquor. The method comprises the following steps of burdening, uniform mixing, ball pressing / drying, pre-reduction and reduction melt separation. According to the method, three original production lines of ferronickel and ferrochrome alloy production and stainless steel mother liquor preparation through mixing and remelting are combined into one process, laterite-nickel ore and chromite are directly utilized for collaborative agglomeration, and the high-chromium nickel-chromium stainless steel mother liquor is prepared in a low-carbon mode through an integrated pre-reduction-electric furnace smelting technical route. According to the method, MgO / SiO2 and Al2O3 / SiO2 in the ferrochrome smelting slag are reduced by adding the silicon-magnesium type laterite-nickel ore, and the smelting slag amount of the high-carbon ferrochrome is reduced by adding the limonite type laterite-nickel ore. By means of the method, the stainless steel production process can be simplified, smelting energy consumption is reduced, addition of auxiliary materials is reduced through the synergistic effect of the raw material end, the slag amount is reduced, economic benefits are improved, and market competitiveness is enhanced.

This invention relates to a method for separating and recovering arsenic and iron from arsenic- and iron-containing bioleaches. The specific steps are as follows: An adsorbent is added to the arsenic- and iron-containing bioleach, mixed thoroughly, and reacted. After adsorption is complete, the solid and liquid phases are separated to obtain an arsenic-iron solution free of bacterial residues. A reducing agent is added to the obtained arsenic-iron solution. After detection, all arsenic and iron are converted to trivalent and divalent valences, respectively, and the reaction is complete, yielding a solution containing low-valent arsenic and low-valent iron. An extractant is added to the reduced arsenic-iron solution to obtain an arsenic-containing organic phase and an iron-containing raffinate. The iron-containing raffinate is returned to the bioleaching process, and the organic phase is back-extracted to obtain an arsenic-containing back-extract. The back-extracted organic phase is reused to extract arsenic. Sodium hydroxide is added to the arsenic-containing back-extract, mixed thoroughly, and then benzyl chloride is added. After stirring and reacting, the mixture is allowed to stand for layering and the acidity is adjusted for crystallization. The crystals are washed and dried to obtain benzylarsine product. This invention solves the shortcomings of existing neutralization processes, such as large slag volume, difficulty in product purification, complex processes, and low arsenic and iron recovery rates. It fully utilizes the arsenic and iron resources in the bioleaching solution and has the advantages of high recovery rate, high product added value, no secondary pollution generated in the process, and low investment.

The application discloses a method for recovering nickel and copper from leaching residue of a copper nickel sulfide ore dressing concentrate, and belongs to the technical field of nickel copper sulfide ore metallurgy, and comprises the following steps: S1, heating and stirring; S2, adding water and stirring; S3, adding chemicals and stirring; S4, flotation; and S5, concentration and filtration. The method adopts segmented stirring, one segment adopts high-concentration heating and stirring, and the second segment adopts new water dilution and stirring, so that the stirring time is prolonged and the stirring is strengthened, the dissolution of water-soluble nickel and copper compounds is promoted, the nickel and copper enter water, and the nickel and copper in water return to the leaching process with the filtering backwater, so that the recovery is realized, the residue amount of the leaching residue is effectively reduced, and the nickel and copper content in the tailings is reduced. Because the leaching residue slurry is acidic, the commonly used xanthate and black medicine type flotation collectors are easy to decompose and lose effectiveness under the condition of an acidic medium, the acid-resistant collector and the foaming agent are used, the nickel and copper sulfides can be floated in the low-pH slurry system, and the nickel and copper content in the tailings is reduced. When the tailings are filtered, the colloid material is less, the filtering process is accelerated, and the turnover rate of the filter press is improved.

The invention belongs to the technical field of converter steelmaking, and particularly relates to a converter phosphorus-retaining smelting process. According to the method, the binary alkalinity R of the slag is always controlled to be 2.0-2.5, and the oxygen flow is large and 22000 m < 3 > / h in the whole process; and the gun position is controlled to be 1200-1400 mm, and the early-stage gun position is 1200 mm, so that early-stage temperature rise is accelerated, a decarburization stage is quickly entered, dephosphorization is inhibited, the loss of molten steel is reduced, the steel tapping amount is increased, the consumption of steel and iron materials is reduced, and meanwhile, the smelting cost is reduced. The phosphorus retention rate in the molten iron reaches 33-55% under the condition that phosphorus-containing alloy is not added, the requirements of various phosphorus-containing steel types are met, and the method is suitable for large and medium-sized converter phosphorus-retaining smelting methods.

The invention provides a method for opening a new furnace by using high-silicon molten iron in a 120-ton dry dedusting converter, belongs to the technical field of steel smelting, and solves the problem that the difficulty of opening the new furnace by using the high-silicon molten iron in the existing dry dedusting converter is large. The method comprises the following steps: converter loading: loading molten iron and scrap steel into a 120-ton top-bottom combined blown converter; oxygen supply by the converter: igniting and supplying oxygen after the converter is loaded; the auxiliary materials are added for the first time after ignition, the auxiliary materials are added for the second time, the active lime is added in batches, and then the limestone and the active lime are added in batches; and converter end point control. According to the method, the converter quantity, the scrap steel quantity and the molten iron quantity are reasonably controlled, the complexity and uncertainty in the production process can be reduced, the stable molten pool depth of the converter in the smelting process can be ensured by accurately controlling the charging quantity, and therefore the production efficiency and the product quality are improved, the production cost is reduced, energy consumption is optimized, and the economic benefit is increased. Unnecessary energy consumption and waste generation are reduced, and environmental protection and sustainable development are facilitated.

The utility model relates to the technical field of food processing, in particular to an oil separation vehicle, which is used for refiltering oil separated by solid-liquid separation equipment and comprises a separation vehicle body, the top of the separation vehicle body is open, the separation vehicle body is provided with a feed accommodating cavity and a discharge accommodating cavity, a first filter screen is arranged on the feed accommodating cavity, and a second filter screen is arranged on the discharge accommodating cavity. The feeding containing cavity is communicated with a liquid inlet pipe, the discharging containing cavity is communicated with a liquid outlet pipe, the feeding containing cavity and the discharging containing cavity are communicated through a second filter screen, the first filter screen is located above the second filter screen, the first filter screen forms a downward recess towards the interior of the feeding containing cavity, and oil separated by the solid-liquid separation equipment is aligned with the first filter screen. The scheme is used for solving the problem that in existing hotpot condiment production, oil in solid-liquid separation equipment is not thoroughly filtered, so that a pipeline is easily blocked.

The invention relates to a process for extracting vanadium from stone coal and smelting to prepare vanadium pentoxide, in particular to an impurity removal and vanadium precipitation process for an alkaline desorption solution. According to the method, the special impurity removal agent is adopted, according to the technological requirements, the quantitative special impurity removal agent is added into the alkaline desorption solution, sectional type impurity removal is adopted, and compared with an existing technology, the whole impurity removal and vanadium precipitation process is more thorough in impurity removal, better in vanadium precipitation effect and lower in vanadium content of vanadium precipitation tail water by controlling technological parameters such as the PH value and the temperature of the impurity removal and vanadium precipitation technology; the method has the advantages that the impurity removal slag amount is small, the vanadium content in the slag is low, the finished vanadium pentoxide product has few impurities and good quality, and 99.50% high-purity vanadium pentoxide can be directly prepared without secondary vanadium precipitation.

This disclosure relates to a comprehensive utilization method for laterite nickel ore, comprising the following steps: (1) beneficiating laterite nickel ore to obtain chromium concentrate, low-nickel low-magnesium ore and high-nickel high-magnesium ore; (2) pulping low-nickel low-magnesium ore to obtain slurry, leaching the slurry, neutralizing, continuously countercurrent washing, solid-liquid separation to obtain filtrate and filter residue, neutralizing and removing impurities from the filtrate to obtain iron-aluminum slag and a solution containing nickel and cobalt, precipitating nickel and cobalt to obtain nickel-cobalt hydroxide; (3) crushing, screening, drying, calcining, adding gypsum, smelting to obtain low-grade nickel matte, and then oxidizing and blowing to obtain high-grade nickel matte; (4) adding the filter residue and iron-aluminum slag obtained in step (2) into a sulfuric acid solution, filtering to obtain filtrate and filter residue, evaporating and concentrating the obtained filtrate to obtain a water treatment coagulant, separating gypsum from the obtained filter residue and reusing it in the smelting process of step (3).

The present invention specifically relates to a multi-dimensional evaluation of the quality of lime for steelmaking and a method for adding and using the lime. Six indicator data values ​​of lime (CaO content, SiO2 content, S content, ignition loss, activity, and particle size) are obtained from the inspection and testing index library, and the influence values ​​of the above six indicators on the effective oxide content are given. A 4-index stability coefficient W is proposed, and its influence value on the effective oxide content of lime is given as 0.15-0.2, and the effective oxide content of lime 5 is calculated. The adjusted price of lime is calculated according to the constraints (the content of the index agreed in the contract and the change of the price gradient), and the effective oxide tonnage value of lime 8 is calculated with the effective oxide of lime. The method has a clear mechanism, clear logic, and strong applicability. The concept of effective oxide of lime is proposed, which changes the shortcomings of the previous method of evaluating the quality of lime only by the effective CaO content.

The present invention relates to a natural gas additive and a preparation method thereof, and belongs to the technical field of fuel gain agents, the natural gas additive comprises, by weight, 70-80% of n-pentane, 4-6% of thiophane, 3-5% of 2, 3-dimethyl butane, 6-10% of methanol, 2-3% of isopropanol, 1-2% of methyl tert-butyl ether, 3-5% of xylene, 0.012-0.018% of cerium stearate, 0.004-0.006% of lanthanum citrate, and 0.38-0.58% of ferrocene. When the natural gas additive is added into natural gas, the cutting efficiency can be improved, gas combustion chemical reaction in unit time and unit space can be accelerated, released energy is increased dramatically, and complete combustion of gas is promoted, so that the flame temperature is greatly increased, and slag is reduced.