51results about How to "Shorten the slag removal time" patented technology

The invention provides a molten iron automatic slagging-off control method based on deep learning. The method comprises the following steps: performing feature extraction on a collected ladle liquid level image, and manually labeling to obtain a slag quantity grade for constructing a data set of a deep convolutional neural network; establishing a deep convolutional neural network framework, and performing training optimization on the deep convolutional neural network model by using an Adam algorithm to obtain an optimized network model; constructing factor types through factors influencing molten iron desulphurization slag, selecting the factor types to which the slag quantity grade standard belongs through a k-nearest neighbor method, and obtaining deep convolutional neural network modelsof different factor types according to the steps 1 to 3; and determining the overall slag quantity grade according to the corresponding network model output layer data, and making a corresponding slagging-off action through system judgment according to the model output. According to the method, the on-site image information data can be fully mined, the optimal slagging-off process can be calculated, the model robustness is high, the slagging-off time can be effectively shortened, molten iron waste is reduced, and the production benefits of enterprises are improved.

The invention discloses a deslagging agent used for smelting cast iron and a preparation method thereof. The deslagging agent comprises, by weight, 70%-75.2% of silicon dioxide, 12.1%-15.9% of aluminum oxide, 0.5%-1.9% of ferric oxide, 1.2%-3.22% of sodium oxide, 1.9%-3.84% of potassium oxide, 0.9%-1.48% of calcium oxide, 0.47%-1.46% of magnesium oxide, and the balance iron and inevitable impurities. The deslagging agent used for smelting the cast iron mainly comprises SiO2 and Al2O3 and can instantly expand when sharply heated to the temperature of 1100DEG C or over so as to form a viscous active material of a porous structure, so that molten iron, slag in the molten iron, and impurities can adhere together to be gathered; the deslagging agent has a low heat conductivity coefficient so that heat conduction and thermal radiation on the surface of the molten iron can be effectively reduced, and a heat preservation effect is achieved; and the problems, such as corrosive pits, white spotsand wrinkles, which occur frequently during cast iron machining are solved while the defects are overcome.

The invention provides a molten iron slag removing method. The method comprises the following steps of: controlling the distance between the slag surface of molten iron and the jar edge of a molten iron jar to be greater than 300 mm; inclining the molten iron jar in an angle of 5 DEG to 9.5 DEG by utilizing an iron hook, and enabling the distance between the upper end of the slag surface and the jar edge of the molten iron jar to be 50 to 100 mm; removing slags from the surface of the molten iron in the molten iron jar by utilizing a slag remover after the molten iron is desulfured; adding slag accumulating agents to the molten iron according to the proportion of adding 0.3 to 0.5 kg of the slag accumulating agent to every ton of the molten iron; and after slag removing, adding heat preserving agents according to the proportion of adding 0.3 to 1.2 kg of the heat preserving agent to every ton of the molten iron. According to the invention, the slag removing time is shortened greatly, i.e. the slag removing time is shortened from 10 minutes to 8 minutes; and the slags in the molten iron jar are removed to a maximum extent, i.e. the slag removing rate is improved from 71% to 83%, so that the slag removing loss of the molten iron is lowered by 13.2%. Therefore, the internal quality and the surface quality of steel material are improved, and the smelting cost is lowered.

The invention provides a molten iron non-pollution electromagnetic slag conglomeration method. Travelling wave magnetic field slag conglomeration devices, each of which is formed by a coil, an iron core and a shell, is prepared; each shell is internally provided with the corresponding coil; each coil is internally provided with a cooling water pipe and is provided with the corresponding iron corewhich is connected with a two-phase or three-phase alternating current at the middle part; a molten iron tank is inclined to a slag skimming position to prepare slag skimming; the travelling wave magnetic field slag conglomeration devices are put on the two sides of a slag outlet of the molten iron tank respectively to push molten iron to generate a specific circumfluence, and slags, difficultly mechanically eliminated, at corner portions of the molten iron tank are brought to the nearby of the slag outlet of the molten iron tank; and a downward electromagnetic force applied to the molten ironis much larger than an electromagnetic force applied to the slags, so that iron in the slags is separated out to enter the molten iron, and separation of the iron in the slags is realized. The molteniron non-pollution electromagnetic slag conglomeration method provided by the invention can eliminate a slag skimming dead angle, reduces the slag skimming action, shortens the slag skimming time, improves the operation efficiency, promotes separation of the iron and the slags, reduces loss of the molten iron, lowers the production cost and can effectively reduce secondary pollution brought by air blowing, slag skimming and the like.

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

The invention provides a novel dross removal head. The novel dross removal head comprises a base, movable dross removal plates, a fixed dross removal plate and a hydraulic cylinder. The hydraulic cylinder is located in a stretchable arm and connected with a push-pull rod, the base is connected with the push-pull rod through hinged rods, the movable dross removal plates and the fixed dross removal plate are arranged on the base, the movable dross removal plates are connected with the base through movable supporting arms, the fixed dross removal plate is connected with the base through a fixed supporting arm, the movable dross removal plates and the fixed dross removal plate are connected with the movable supporting arms and the fixed supporting arm through wedge pieces, the hinged rods, the movable supporting arms, the fixed supporting arm and the base are connected together through a main shaft, and the movable dross removal plates and fixed dross removal plate are provided with grooves. The novel dross removal head is reasonable in structure, simple in design and convenient to operate; the working efficiency is improved, time is shortened, heat losses of solutions in the process and the solutions taken out during dross removing are reduced, the frequency is increased, yield is increased, cost is reduced, energy resources are saved, and the service life is prolonged.

The invention discloses a top oblique insert type spray gun for air blowing slag accretion. A connecting section comprises a metal connecting pipe and a connecting part, a gun body section comprises a metal main pipe, a gun body section refractory castable lining and a gun body section V-shaped anchoring part, and a nozzle section comprises a metal spray pipe, a nozzle section refractory castable lining and a nozzle section V-shaped anchoring part. The metal spray pipe and the metal main pipe are in welded communication, and an included angle alpha formed by the metal spray pipe and the metal main pipe is greater than 0 degree and less than 180 degrees. A diffuse type nozzle facing to the molten iron surface during air blowing is arranged in the nozzle section refractory castable lining, and a through hole which corresponds to the diffuse type nozzle and communicates with the diffuse type nozzle in the radial direction is formed in the side wall of the upper half portion of the metal spray pipe in the radial direction. Advantages of the top gun air blowing auxiliary deslagging technology and advantages of the molten iron jar air brick ventilation auxiliary deslagging technology are highly gathered, all kinds of disadvantages existing in conventional top gun air blowing or air brick ventilation are fully overcome, and the comprehensive purposes of reducing deslagging iron losses, shortening deslagging time, prolonging the service life of a molten iron jar and the air blowing slag accretion spray gun and lowering deslagging process cost are realized.

The invention relates to the technical field of ferrous metallurgy, in particular to a ladle slag conglomeration agent prepared by boric sludge. The slag conglomeration agent is made of raw materials including, in weight percent, 50%-65% of boric sludge, 30%-40% of silica and 5%-10% of emery powder. A preparation method of the slag conglomeration agent mainly includes the steps of grinding, distributing, blending and pelleting. The ladle slag conglomeration agent is added into a ladle slag layer before slag removal and after powder injection desulfurization pretreatment is performed in a ladle, the agglomeration performance of desulfurization slag can be effectively improved, slag collection and slag removal efficiency is increased, slag removal frequency is decreased, slag removal time is shortened, slag removal iron loss can be reduced, molten iron backflow is decreased, desulfurization effects are ensured, and the ladle slag conglomeration agent has remarkable economic and social benefits and is worthy of popularization.

The invention discloses a slag-adhesion-preventing refractory castable for a molten iron composite slagging-off plate, and a preparation method and a use method of the slag-adhesion-preventing refractory castable, wherein the anti-sticking slag refractory castable comprises 37-45% of high alumina clinker, 18-25% of electro-fused mullite, 10-20% of silicon carbide, 6-10% of alpha-Al2O3 micro powder, 1-3% of silicon oxide micro powder, 4-6% of pure calcium aluminate cement, 3-5% of corundum fine powder, 1-3% of heat-resistant steel fibers, 2-5% of expanded graphite fine powder, and 1-2% of spodumene fine powder. Auxiliary raw materials comprise an antioxidant, polyvinyl alcohol explosion-proof fibers and a water reducing agent, and the surface of the corundum fine powder is coated with a nano carbon film; the comprehensive purposes of prolonging the service life of the composite slagging-off plate, preventing slag from adhering to a refractory material lining of the slagging-off plate, improving the slagging-off efficiency, shortening the slagging-off time, reducing the slagging-off iron loss, avoiding the labor intensity of manual cleaning of adhered slag of the conventional composite slagging-off plate, simplifying the slagging-off operation and the like are achieved.

The invention discloses a slag-collecting agent of pre-treatment for molten iron, containing the following raw materials by weight percentage: 60-80 parts of perlite, 5-15 parts of potassium-sodium feldspar and 10-20 parts of white sand. Compared with the traditional technique, the invention has the advantages as follows: 1 the time of slag-raking is short, after the slag-collecting agent is added, the process furnace is slagged totally with good effect of slagging, slag appears big block to rake easily and completely; the time of slag-raking is 1/3 times that of slag-raking without the slag-collecting agent, the slag is completely raked, the quantity of slag in the molten iron is decreased, thus efficiently improving the condition of the molten iron entering furnace; 2 iron loss is little, after the slag-collecting agent is added, the iron loss of the iron slag is reduced from average 6.25kg iron per ton to below 1kg iron per ton; 3 the desulfurization degree of the molten iron is not influenced; 4 As the agent causes no pollution to environment in used, and is of no toxicity, no dust, no smell, convenient operation, wide source of materials and low cost, the requirements of steel plants can be fully met.

The invention provides an integrated desulfuration slag rake, wherein manufacturing of an original slag rake is simplified, and the novel desulfuration slag rake does not have a welding portion. Strength of the novel desulfuration slag rake is enhanced, service life of the novel desulfuration slag rake is prolonged, and the novel desulfuration slag rake is flexible and convenient to use. Original wedge pin connection is changed into the connection method of surface-to-surface contact, a protruded rectangular body which can be used for hanging of the slag rake is omitted, a connection trapezoid hole is welded on a connection portion, the slag rake can be placed into the connection trapezoid hole, and the width of the connection trapezoid hole is consistent with the thickness of the slag rake. During installation, a connection port of the slag rake is directly and wholly inserted into the trapezoid hole to form the surface-to-surface contact, and an inserting bolt is placed on the trapezoid hole to prevent falling-off. No stress exists, so that no deformation occurs. Replacement is convenient and rapid, manufacturing cost is lowered, and drossing efficiency is improved.

The invention provides a novel dross removal device. The novel dross removal device comprises a motor, a numerical control instrument, an L-shaped support and a dross removal plate. The motor is connected with the numerical control instrument through a connecting rod, the numerical control instrument is connected with the L-shaped support through a stretchable arm, the stretchable arm is fixed to the L-shaped support through nuts, a single-lug plate is welded to the interior of the L-shaped support and movably connected with a double-lug plate through a hinged shaft, the double-lug plate is welded to the inner side of a stop plate, a hanging rod is arranged on the outer side of the stop plate, the dross removal plate with a hanging rod hole is fixed to the hanging rod through a locking pin, and a plate head of the dross removal plate is in an circular arc shape. The novel dross removal device is simple in design and convenient to use; as the numerical control instrument is installed, automation of the dross removal process is achieved, the dross removal efficiency is improved, and the labor intensity of an operator is reduced. The novel dross removal device is suitable for dross removal of steel ladles and hot metal ladles and also suitable for dross removal of various other furnaces.

The invention provides a desulfurized slag modifier and a molten iron desulfurization method, and the desulfurized slag modifier comprises the following raw material components in 100 parts by weight: 60-75 parts by weight of soda ash with the Na2CO3 weight percentage of not less than 90 wt%; the weight percentage of CaO in the lime powder is not less than 80wt%; the content of CaF2 in the fluorite powder is not less than 80 wt%, and the content of CaF2 in the fluorite powder is 10-15 parts. When the desulfurization slag modifier provided by the invention is used for desulfurization, a part of pre-slag can be reserved in a ladle, and the desulfurization slag modifier can modify the pre-slag, so that the desulfurization capacity of the pre-slag is improved, the slagging-off time of the pre-slag is shortened, the temperature of molten iron is prevented from being too high, the desulfurization efficiency is effectively improved, and remarkable economic benefits are brought to enterprises.

The invention discloses an efficient slagging-off plate for molten iron slagging off. The efficient slagging-off plate for molten iron slagging off comprises a connecting part and a working part, wherein the working part comprises a left side plate, an intermediate plate and a right side plate; the left side plate and the right side plate are symmetrically distributed along a center line of the intermediate plate; an included angle between the left side plate and the intermediate plate and the included angle between the right side plate and the intermediate plate are 120-160 degrees; the totalthickness H of the working platform is 75-100mm; the ratio of the total width A of the working part to the diameter D of an opening of a molten iron cylinder is 0.2-0.3; the ratio of the total heightB of the working part to the total width A is 0.55-0.75; and the ratio of the width A of the intermediate plate to the total width A of the working part is 0.5-0.8. According to the efficient slagging-off plate for molten iron slagging off, the structure design of the slagging-off plate and the structure size of the molten iron cylinder are designed in a fitting manner, the slagging-off plate isof a saddle structure, and the size is optimized, etc., so that the purposes of improving the slagging-off efficiency, reducing the iron loss in slagging off, reducing the slagging-off time, reducingthe times of slagging off, prolonging the service life of the slagging-off plate and other purposes for improving comprehensive economic technical preparation of molten iron slagging off can be achieved.