49results about How to "Improve smelting efficiency" patented technology

The invention relates to the technical field of gas supply, and discloses a steel ladle bottom blowing slow-release gas supply structure and method. The control module is arranged on the steel ladle main body and is used for being responsible for automatic control including sensor data monitoring and valve opening adjusting; the sensor module is arranged on the steel ladle body and used for monitoring temperature, pressure and gas flow parameters in real time and feeding data back to the control module; the gas supply module is used for conveying through high-pressure air or other inert gases and providing a stable gas source for the bottom blowing device of the steel ladle main body; and the slow release device is arranged at the bottom of the steel ladle main body and is used for slowly releasing the supplied gas so as to ensure the uniform distribution of the supplied gas. According to the steel ladle bottom blowing slow-release gas supply structure and method, the efficiency and safety in the smelting process are improved, the product quality is improved, resource saving and intelligent management are achieved, and important support is provided for development of the modern steel and iron manufacturing industry.

The utility model discloses integrated furnace eye opening and blocking equipment suitable for industrial silicon smelting, which comprises a track walking platform, a three-dimensional lifting platform capable of rotating, lifting and translating is arranged on the track walking platform, and the three-dimensional lifting platform is fixedly connected with a furnace eye opening and blocking mechanism; by arranging the furnace hole opening and blocking mechanism, the furnace opening mechanism and the furnace blocking mechanism are integrated on one device, the technical problem that furnace hole opening equipment and furnace hole blocking equipment must be used in the discharging process of an existing high-temperature submerged arc furnace is solved, and the industrial silicon smelting efficiency is improved; by arranging the three-dimensional lifting platform, translation or rotation of the furnace hole opening and blocking mechanism in the X direction, the Y direction and the Z direction is achieved; by arranging the track walking platform, the furnace hole opening and blocking mechanism can freely move on the track outside the furnace body.

The invention provides a multivariable control method for the carbon content of a ferrosilicon furnace, and is applied to the technical field of ferrosilicon-manganese alloy smelting. The method comprises the following steps: acquiring multivariable parameters for the carbon addition amount of the silicon iron furnace; the multiple parameters comprise an electrode current, a power factor, an artificial iron control parameter, an electrode pressure release amount, an electrode position, a furnace gas size, a weight of fly ash, hole opening time, a molten iron temperature and a hole opening flow rate; setting a judgment quantity, wherein the judgment quantity has an initial value; for each parameter in the multivariable parameters, adding different numerical values to the judgment quantity according to different conditions of parameter values to obtain a final accumulated value of the judgment quantity; when the accumulated value of the final judgment quantity is larger than a first threshold value, the silicon iron furnace is judged to be high in carbon intensity, and the carbon adding quantity is reduced by a first preset quantity; and when the accumulated value of the final judgment quantity is smaller than a second threshold value, the silicon iron furnace is judged to be carbon-deficient, and the carbon addition quantity is increased by a first preset quantity. According to the method, the carbon addition amount can be adjusted in time, and the purposes of stabilizing the furnace condition, reducing the unit consumption and improving the yield are achieved.

The invention provides a smelting electric arc furnace and system, and relates to the technical field of smelting equipment, the smelting electric arc furnace comprises a furnace body, an electrode assembly, a furnace door and a pressing mechanism, and the furnace body is provided with a feeding port, a smoke outlet, a bottom blowing port, a slag outlet and a steel outlet; the electrode assembly comprises at least one first electrode; the furnace door is arranged on the furnace body in an openable manner; the pressing mechanism comprises a pushing head and a connecting piece connected with the pushing head, when the furnace door is located at the opening position, the connecting piece can drive the pushing head to stretch into the furnace body through the furnace door, and the pushing head can be used for pressing raw materials floating on a molten pool in the furnace body into the molten pool. Compared with the prior art, the direct reduction iron (DRI) raw material floating on the molten pool can be pressed into molten steel, the number of the direct reduction iron (DRI) raw material floating on the molten pool is reduced, the metal recovery rate of the direct reduction iron (DRI) is further increased, the air sealing structure can play an air sealing role on the furnace body in the smelting process, and therefore production of low-nitrogen steel is achieved.

The invention relates to the field of metallurgy, and provides an efficient titanium slag smelting method which comprises the following steps: controlling the total charging quantity of titanium concentrate in a single furnace according to the effective volume and rated power supply power of an electric furnace, blanking according to a fixed feeding speed, and calculating the total charging quantity of a reducing agent in the single furnace based on the total charging quantity of the titanium concentrate in the single furnace, blanking is carried out according to the feeding speed from high to low; the titanium concentrate and a reducing agent are conveyed into a smelting furnace to be subjected to continuous micro-negative-pressure smelting, first-time deslagging operation is carried out, a first part of titanium slag is obtained, and electrification is maintained; and when the total iron content of the first part of titanium slag is reduced to an expected value, electrifying is stopped, secondary slag tapping and iron tapping operation are carried out, and a second part of titanium slag and low-carbon molten iron are obtained. According to the method, on the premise that the unit furnace burden reducing agent adding amount and the unit power supply power are not changed, the furnace feeding system and the corresponding power supply power of the reducing agent are adjusted, so that the high-and-low carbon adding system and the low-and-low power supply system are formed, and the smelting efficiency in the titanium slag smelting process is effectively improved.

The invention relates to the technical field of steelmaking automation, in particular to an intelligent control system and method for a high-purity molten steel smelting converter, and the system comprises a data collection module which is used for collecting operation parameters related to the converter during molten steel smelting, and the operation parameters comprise molten steel temperature, gas components, oxygen amount and blowing time; the curve generation module is used for determining a change curve of the corresponding operation parameters during molten steel smelting according to the obtained operation parameters, and the change curve comprises a change curve corresponding to the molten steel temperature, the gas composition, the oxygen amount and the blowing time; the component display module is used for analyzing and processing the change curve according to the identified change curve of the operating parameters, and determining the occurrence probability of the operating parameters and a target value corresponding to the occurrence probability when the purity of the molten steel meets the requirement; and the production efficiency and the stability in the molten steel smelting process are improved.

The invention provides a blast furnace slag alkalinity prediction method based on big data, and belongs to the technical field of data processing, and the method comprises the following steps: step 1, monitoring and collecting smelting related data of a blast furnace in real time based on preset monitoring equipment, and processing the smelting related data of the blast furnace to obtain a smelting related data set of the blast furnace; 2, analyzing a related data set of blast furnace smelting, and further constructing a final slag alkalinity prediction model; 3, analyzing a related data set of blast furnace smelting, and constructing a theoretical calculation model of the blast furnace slag alkalinity; 4, output results of the theoretical calculation model of the blast furnace slag alkalinity and the final slag alkalinity prediction model are obtained respectively, and then the alkalinity accuracy rate of each model is determined based on the output results; and step 5, determining a final prediction result based on the alkalinity accuracy rates of all the models and pushing the final prediction result to an artificial interaction interface. Accurate prediction and intelligent pushing of the alkalinity of the blast furnace slag are achieved, and the smelting efficiency and the process control level are improved.

The invention discloses an electrolytic manganese crushed manganese recycling process and a system thereof, and aims to recycle crushed manganese in an efficient and environment-friendly manner. The process comprises the following steps: mixing crushed manganese, scrap iron and a desulfurizing agent, adding into a direct-current electric arc furnace, smelting by utilizing direct current, and realizing desulfurization and uniform components by controlling electrode voltage and current intensity. In the smelting process, sampling analysis is conducted regularly, smelting parameters are adjusted according to results, and product quality is ensured. And after smelting is finished, cooling is conducted by controlling the flow speed and temperature of cooling water, and cracks or other defects are avoided. The system comprises a mixing device, a direct-current electric arc furnace, a tapping device and a cooling system, the direct-current electric arc furnace is a four-electrode cycle automatic reversing direct-current electric arc furnace and is provided with a water cooling system and an electrode sealing guide device, and the stability and safety of the smelting process are ensured. In addition, the system further comprises a collecting tank used for recycling dust, and environmental pollution is effectively reduced.

The invention provides a method for improving the niobium yield of niobium-containing austenitic stainless steel, belongs to the technical field of stainless steel smelting, and solves the problem of low yield of a traditional niobium-containing austenitic stainless steel niobium collecting method.The method comprises the following steps that after the niobium-containing austenitic stainless steel smelted in an AOD converter enters a reduction stage, the binary alkalinity of reduction furnace slag is controlled; after reduction, AOD converter smelting desulfurization is carried out, and the binary alkalinity of AOD converter desulfurized slag is controlled; after desulfurization, ferroniobium is added to the bottom of a steel ladle according to the AOD converter tapping amount and the target niobium component, and tapping operation is carried out; lF ladle refining is carried out after tapping, materials are added for slag adjustment according to the viscosity of slag during LF furnace treatment, and then fine adjustment is carried out on the molten steel niobium component according to the in-station niobium content, so that the molten steel component meets the casting requirement. According to the method, the problem that the niobium yield of the niobium-containing austenite is low is effectively solved, the niobium yield is effectively increased to 95% or above, stable and efficient production is achieved, and meanwhile the smelting cost of the niobium-containing austenite is effectively reduced.

The invention provides a metal smelting vacuum powder spraying device and a using method thereof.The device comprises a vacuum chamber, a powder spraying gun lifting mechanism and a powder spraying gun, the powder spraying gun lifting mechanism and the powder spraying gun are arranged in the vacuum chamber, the powder spraying gun lifting mechanism comprises a steel supporting frame arranged upwards from the bottom of the vacuum chamber, and a liftable trolley is arranged on the steel supporting frame; a vertically downward powder spraying gun is installed on the trolley, the upper end of the powder spraying gun is connected with one end of a powder inlet pipe, the other end of the powder inlet pipe penetrates out of the side wall of the vacuum chamber and is connected to a powder bin, and the part, located in the vacuum chamber, of the powder inlet pipe is arranged in a drag chain. A connecting channel is arranged at the bottom of the vacuum chamber, the connecting channel is communicated with the reaction chamber, and the powder spraying gun positively rushes the center of the connecting channel. Continuous feeding and powder spraying can be achieved in the vacuum state, the powder spraying position of the powder spraying gun can be adjusted, and the smelting efficiency and the smelting reaction stability are improved.

The present invention belongs to the technical field of steel smelting, and discloses an automatic slag removal system and device for a bottom blowing furnace. The automatic slag removal system is connected to an automatic slag removal robot by signal, and the automatic slag removal system comprises an image acquisition module, an identification module, an analysis module and a decision module, wherein the image acquisition module is configured to: acquire image data of at least two bottom blowing furnaces in real time; the identification module is configured to: identify slag information in each bottom blowing furnace from the image data; the analysis module is configured to: calculate the slag area in each bottom blowing furnace according to the identified slag information; the decision module is configured to: compare the calculated slag area with a preset value, and trigger a slag removal signal when the slag area is greater than the preset value, so as to control the automatic slag removal robot to automatically clean the slag in each bottom blowing furnace according to the slag information; wherein the image data acquired by the image acquisition module comprises plane image data, point cloud image data, thermal distribution image data and video image data.

The utility model discloses a submerged arc furnace low-voltage compensation device which comprises a power grid, a furnace transformer, a harmonic monitoring energy management and control device, a submerged arc furnace, a submerged arc furnace low-voltage filtering compensation power-saving device and a short net system compensation filter arranged in the submerged arc furnace low-voltage filtering compensation power-saving device. The furnace transformer is connected with the submerged arc furnace low-voltage filtering compensation power-saving device through the harmonic monitoring energy management and control device, the submerged arc furnace low-voltage filtering compensation power-saving device is connected with the short net through a water-cooling copper pipe, and the short net system compensation filter comprises a first transformer. According to the low-voltage compensation device for the submerged arc furnace, the submerged arc furnace short net low-voltage reactive compensation device sleeve is additionally arranged, the primary current of the submerged arc furnace short net is reduced, and meanwhile, the active power is greatly improved, so that the operating parameters and the consumption index of the submerged arc furnace are greatly improved, the smelting efficiency of the submerged arc furnace is improved, and the electric energy consumption is reduced.

The application provides a novel natural gas melting furnace, which comprises a furnace body, the top of the furnace body is connected with an environmental protection pipeline, and the bottom is provided with a discharge port; a heating mechanism, the heating mechanism comprises burners which are installed on the inner wall of the furnace body and are arranged in a circumferential direction; the input end of the burner penetrates through the furnace body and is connected with external natural gas and combustion-supporting gas respectively; a grate mechanism, the grate mechanism is located above the heating mechanism and comprises a plurality of parallel grate pipes; the two ends of the grate pipe penetrate through the side wall of the furnace body and are internally provided with hollow water channels; the plurality of grate pipes are arranged in a special shape, which is used for increasing the contact area of the support surface and the fire source. According to the technical scheme provided by the embodiment of the application, the independent grate pipes are installed in the interior of the furnace body, so that the grate pipes can form support planes in various shapes such as wave shape, triangle, U shape and trapezoid, thereby effectively increasing the heating area and improving the smelting efficiency of the ore.

The present application relates to a kind of industrial silicon composite reducing agent prepared with fruit skin humus, and belongs to the technical field of composite reducing agent for industrial silicon smelting.The fruit skin is cut into fruit skin particles, water is added to cover the fruit skin particles, then yeast powder is added and sealed for fermentation to obtain fruit skin humus;non-caking coal powder, fruit skin humus, starch, wood powder and microsilica powder are mixed and then ground to clump to obtain a mixture;the mixture is pressed to form a cylindrical pellet embryo;the cylindrical pellet embryo is placed in an argon environment and subjected to microwave calcination, and then cooled to room temperature in the furnace to obtain an industrial silicon composite reducing agent pellet.The industrial silicon composite reducing agent pellet has a strength of 10-14 MPa, a calorific value of 7200-8000 calories / gram, and a caking index of 49-72, which meets the preparation requirements of industrial silicon pellet reducing agent.

The invention provides sintered ore with a coating structure and a preparation method and system.The preparation method comprises the steps that lump ore is subjected to high-temperature preheating treatment and then crushed and screened, and lump ore particles are obtained; uniformly mixing an iron-containing raw material, a CaO-containing flux, a fuel and water to obtain an outer-layer mixed material; after the lump ore particles are put into a disc pelletizer, atomized water is sprayed to the surfaces of the lump ore particles; caO is sprayed to the surfaces of lump ore particles; the outer-layer mixed material is added into a disc pelletizer, atomized water is continuously sprayed for pelletizing, screening is conducted after pelletizing is finished, and a green pellet mixed material is obtained; conveying the green pellet mixture to a sintering machine, igniting the green pellet mixture, and sintering the green pellet mixture under the condition of injecting hydrogen-rich gas to obtain high-temperature sintered ore; and hydrogen is adopted as a cooling agent to cool the high-temperature sintered ore, and pre-reduction of the high-temperature sintered ore is achieved in the cooling process. The sintered ore has high strength and air permeability, the utilization ratio of lump ore is increased, lump ore fragmentation is avoided, and therefore the metallurgical performance of the lump ore is improved.

This invention discloses an automatic bottom-blowing adjustment system for converters based on gas source conversion, relating to the field of converter metallurgy. Specifically, it includes a human-machine interface module, a steel grade identification module, a processing module, a smelting judgment module, a bottom-blowing flow control module, and a flow optimization and adjustment module. The human-machine interface module stores and inputs steel grade information, including the steel grade name, grade, and whether there are special requirements for nitrogen and oxygen content. The steel grade identification module automatically identifies and reads the steel grade information stored in the human-machine interface module and transmits the information to the processing module and the bottom-blowing flow control module. This invention achieves personalized bottom-blowing flow optimization at different smelting stages by precisely adapting to the characteristics of high-carbon steel, low-carbon steel, and alloy steel, reducing quality problems, improving product quality stability and consistency, and dynamically adjusting the flow based on multi-source real-time data to avoid unreasonable issues, thereby improving smelting efficiency and reducing costs.

The present application relates to a kind of full coal high-value preparation silicon smelting composite reducing agent pellet method, belong to carbonaceous reducing agent pellet preparation technical field.The present application is broken to particle size less than 0.2mm by grinding to vacuum drying full coal pulverized coal;Coffee shell powder is added to NaOH solution and soaked and activated, and coffee shell binder is obtained by solid-liquid separation;Full coal pulverized coal, coffee shell binder, microsilica and silica powder are ground and mixed to obtain coal powder mixture;Coal powder mixture is formed by pressing to obtain cylindrical blank;Cylindrical blank is placed in argon atmosphere and microwave calcination is carried out, and it is cooled to room temperature with furnace to obtain silicon smelting composite reducing agent pellet.The strength of the silicon smelting composite reducing agent pellet of the present application is 9~13MPa, which meets the needs of industrial silicon production, and after industrial test of the pellet, the silicon yield can reach 40~70t / d, the power consumption is 10500~12000KW·h / t, and the carbon excess coefficient is 1.1~1.7.

The invention relates to the technical field of ferrous metallurgy, in particular to a converter slagging fluxing agent based on red mud and a preparation method and application thereof.The converter slagging fluxing agent comprises a mixed waste material and an adhesive, the mixed waste material is composed of the red mud, fly ash and iron oxide scale according to the mass ratio of (45-50): (45-50): (1-5), and the adhesive is composed of the red mud, the fly ash and the iron oxide scale; the mass of the adhesive accounts for 10wt%-14wt% of the total mass of the converter slagging fluxing agent; the total iron content of the converter slagging fluxing agent is larger than or equal to 50%, the compressive strength is larger than 1500 N, the moisture content is smaller than or equal to 1%, and the particle size range is 10-70 mm. The converter slagging fluxing agent is prepared from red mud and fly ash through a ball pressing process, so that the overall melting point of slag is reduced, and the slag fluidity is improved.

The present invention relates to the technical field of aluminum profile processing equipment, and specifically, to an electrically heated aluminum profile smelting furnace, comprising a box body, a box cover and a motor, wherein the box body is movably connected to the box cover, the motor is arranged outside the box body and close to the bottom end of the box body, a control mechanism is fixedly installed at the bottom end of the box body, a heating mechanism is arranged at the upper end of the control mechanism, and a heat insulation plate is arranged between the heating mechanism and the control mechanism, and the materials of all the mechanisms of the present invention are high temperature resistant materials. The present invention smelts aluminum profiles by eddy current heating, and adopts the method of overall preheating of the first coil and gradual heating of the second coil, thereby reducing energy loss and improving smelting efficiency. By setting a control mechanism and a box cover with a special structure, manpower is saved, making the opening and closing of the box cover more convenient, and the staff can avoid being scalded by the high temperature box cover when performing subsequent operations, thereby improving safety.

The utility model discloses an acid sinter proportion regulating and controlling device, which is applied to the technical field of sinter production and comprises a proportioning tank, raw material tanks are fixedly communicated with two sides of the top of the proportioning tank, a motor is bolted to the top of the proportioning tank, and a first mixing rod rotationally connected with the proportioning tank is bolted to the output end of the motor. And a rotating disc is welded on the surface of the first mixing rod. In the ore mixing process through rotation of the first mixing rod, the second mixing rod revolves around the surface of the first mixing rod, and meanwhile, the second mixing rod rotates in the direction opposite to that of the first mixing rod to conduct secondary mixing on the ore. Therefore, the mixing efficiency during ore proportioning is improved, and subsequent smelting of a blast furnace is facilitated. In the ore mixing process, the screening net is driven to continuously vibrate up and down, and the ore is screened. Therefore, blocky large ore can be separated out and prevented from entering a blast furnace to be smelted, the ore smelting efficiency is improved, and the effect after smelting is guaranteed.

The present invention discloses a mixed material blowing device based on the visualization of material and flow field state, comprising a furnace body, a feeding module, a blowing system, a visualization monitoring module and a control system, wherein the feeding module is used to convey raw materials into the furnace body, the visualization monitoring module adopts laser detection technology to detect the flow field state in the furnace body, the control system controls the blowing system to change the blowing angle and strength according to the flow field information in the furnace body monitored by the visualization monitoring module, the blowing system comprises a hot air surrounding pipe, a main pipe, a spherical connection component, a blowing pipe and a driving mechanism, wherein the hot air surrounding pipe is installed on the outside of the furnace body, a plurality of main pipes are arranged on the hot air surrounding pipe, the main pipe extends into the inside of the furnace body and is connected to the blowing pipe through two spherical connection components, and a driving mechanism for driving the blowing pipe to deflect is arranged on the furnace body.

The invention belongs to the technical field of metallurgical equipment, and particularly relates to a direct-current arc submerged arc furnace of a star-shaped loop. According to the technical scheme, the furnace comprises a furnace body and an electrode system, wherein the bottom of the electrode system penetrates through a hole in the top of the furnace body and extends into the furnace body; the electrode system comprises a negative electrode and a positive electrode, the number of the negative electrode is one, the number of the positive electrode is an integer larger than or equal to 3, the positive electrode and the negative electrode are arranged at equal intervals, and the positive electrode is evenly arranged at equal angles with the negative electrode as the center and is in a star shape radiating outwards from the center. According to the invention, the structural design is reasonable, and the negative electrode and the plurality of positive electrodes are distributed in a star shape radiating from the center to the outside, so that the problems of low temperature of the furnace core and arc deflection of the central electrode are thoroughly solved, the phenomenon of non-uniform temperature distribution in the furnace is effectively improved, the range of heat and reaction distribution in the furnace is expanded, and the service life of the furnace is prolonged. And the smelting efficiency and the energy utilization rate are improved.

The utility model belongs to the technical field of low-carbon metallurgy, and provides a gas-based shaft furnace direct reduction iron recovery production device which comprises a shaft furnace body used for producing direct reduction iron, a charging unit and a recovery unit are arranged at the top of the shaft furnace body, and a discharging unit is arranged at the bottom of the shaft furnace body; the material distributing unit comprises an inlet, a first outlet and a second outlet, the inlet is connected with the material discharging unit, the first outlet is used for discharging qualified direct reduced iron, and the second outlet is used for discharging unqualified direct reduced iron; and the conveying unit is connected with the second outlet and is used for conveying the unqualified direct reduced iron to the recovery unit. According to the scheme, the problems of high production energy consumption, dust pollution, low smelting efficiency, heat loss and the like in the recovery treatment process of the unqualified direct reduced iron in the prior art can be effectively avoided.

The utility model discloses an industrial silicon smelting device, which belongs to the technical field of industrial silicon smelting and comprises a furnace body and a connecting box, sliding plates are symmetrically mounted on two sides of the inner wall of the connecting box in a sliding manner, and a first guide plate, a first screening plate and a second screening plate are fixedly mounted on the sides, close to each other, of the two sliding plates in a staggered manner; a supporting plate is fixedly installed between the two sliding plates, a supporting frame is fixedly installed between the two sides of the inner wall of the connecting box, crushing rollers are symmetrically and rotationally installed on the inner wall of the supporting frame, a driving assembly is installed at one ends of the crushing rollers, and a transmission assembly matched with the driving assembly is installed on the supporting plate; a partition plate is fixedly installed at the bottom end of the inner wall of the connecting box, a first discharging pipe is fixedly installed on one side of the connecting box, a vertical pipe is fixedly installed at one end of the first discharging pipe, and a conveying assembly is installed in the vertical pipe. The device has the advantages that the smelting efficiency and the particle screening precision are improved, crushing and screening are integrated, maintenance and cleaning are convenient, and partition is clear.

The invention relates to the technical field of metallurgical coke powder, and discloses a preparation method of metallurgical coke powder cold-pressed pellets, which comprises the following steps: S1, feeding: putting a prepared coke powder raw material into a stock bin (2) through a forklift, and providing the material for the next procedure conveniently by the material in the stock bin (2); the method has the following advantages and effects that the formed coke is high in forming rate and uniform in particle size, wet pellets fall for more than two times at 1.5 m to be complete, the drying strength can reach more than 150 kg, the firing heat strength at 1100 DEG C is more than 40 kg, the furnace burden requirement is met, the formed coke replaces coke to serve as a reducing agent to be put into a blast furnace for ironmaking, the framework effect is provided, and the formed coke is suitable for large-scale production. According to the present invention, the air permeability in the blast furnace is improved, the fine coke powder particles can be tightly combined together by adding the coke powder binder so as to form the high-strength unbreakable pellet, the coke powder can easily form the regular and uniform pellet shape during the cold press molding process, and the prepared pellet can easily improve the smelting efficiency and the product quality.

The invention belongs to the technical field of gold smelting, and provides a method for reducing the mercury content in a gold smelting pregnant solution. The method comprises the following steps: firstly, measuring the mercury content in a gold smelting pregnant solution to be treated, then sequentially adding sodium diethyldithiocarbamate and a composite sulfur slow-release agent into the pregnant solution, and reacting for 2-4 hours under the conditions that the reaction temperature is controlled to be 25-35 DEG C and the stirring speed is 150-250 revolutions per minute; the composite sulfur slow-release agent is prepared from calcium sulphoaluminate, modified silica gel and a carbon nano-tube; and finally filtering and separating the pregnant solution. A novel composite sulfur slow-release agent is adopted, the slow-release agent can intelligently regulate and control the release rate of sulfur ions according to the ion concentration environment in the pregnant solution, meanwhile, a specific ion selectivity accelerant is added, the sulfur ions are accurately guided to be preferentially combined with mercury for precipitation, and therefore the mercury content is efficiently reduced on the basis that the extraction rate of gold and silver in the pregnant solution is not affected.

The utility model relates to an RH (Ruhrstahl Heraeus) furnace top gun, which belongs to the technical field of steelmaking equipment and comprises a gun body and a spray head, the gun body consists of a plurality of layers of sleeves, the plurality of layers of sleeves sequentially comprise an oxygen pipe, a natural gas pipe, an ignition pipe, a flame detection pipe, a water pipe and an outer pipe from inside to outside, the oxygen pipe is arranged in the center inside the gun body, and a nozzle is arranged at one end of the oxygen pipe close to the spray head. According to the RH top lance disclosed by the utility model, the nozzle form is optimized at the spray head, so that the impact of oxygen on the liquid level of molten steel is relatively uniform, the smelting efficiency can be accelerated, and the noise can be reduced.

The invention discloses a gold smelting production process. The gold smelting production process specifically comprises the following steps: (1) ore pretreatment; (2) flotation; (3) smelting; (4) refining; and (5) treating wastewater and waste gas. According to the efficient and environment-friendly gold smelting production process, by optimizing the key steps of ore pretreatment, flotation, smelting, refining, waste water and waste gas treatment and the like, the gold smelting efficiency is improved, the production cost is reduced, and environmental pollution is reduced; and reference can be provided for other precious metal smelting fields.

The invention provides a method for improving the raw material yield, the smelting efficiency and the molten steel cleanliness of a DRI electric arc furnace, which comprises the following steps of: filling a smelting raw material containing waste steel into the electric arc furnace, starting a power supply, and inputting electric energy into the electric arc furnace through an electrode; an electric arc furnace wall oxygen lance is used for supplying oxygen into the electric arc furnace; after a molten pool is formed in the electric arc furnace, directly reducing iron is continuously added, and oxygen and DRI fine materials are blown into the molten pool through an oxygen lance on the wall of the electric arc furnace; after the direct reduced iron completely enters the molten pool, limestone is added to the surface of the molten pool for slagging; limestone is continuously added into the electric arc furnace for slagging; blowing oxygen and DRI fine materials into the molten pool by using an oxygen lance on the wall of the electric arc furnace; and oxygen and DRI fine materials are continuously blown into the molten pool through the furnace wall oxygen lance of the electric arc furnace. According to the method, the smelting efficiency of the electric arc furnace and the cleanliness of molten steel are synchronously improved while efficient utilization of the DRI fine materials in the smelting process of the electric arc furnace is achieved and the yield of the DRI fine materials is improved.

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.