156results about How to "Reduce the amount of slag" patented technology

A method for extracting silicon dioxide, alumina and gallium oxide from high-alumina fly ash relates to the technology fields of environmental mineralogy and material, chemical industry and metallurgy. The method comprises the main steps as follows: causing the high-alumina fly ash to react with sodium hydroxide solution; filtering the solution; introducing CO2 to the filtrate for full gelation; cleaning, purifying, drying, grinding and calcining the silica gel after gel filtration to obtain finished white carbon black; adding limestone and a sodium carbonate solution into the filter mass after the reaction and filtration of the high-alumina fly ash and the sodium hydroxide solution; ball grinding the mixture into raw slurry; dissolving out the clinker obtained by baking the raw slurry; subjecting the filtrate to deep desiliconization to obtain sodium aluminate extraction liquid; filtrating the sodium aluminate extraction liquid after subjecting the sodium aluminate extraction liquid to carbon dioxide decomposition; baking the aluminum hydroxide after washing the filter mass to form the aluminum hydroxide product; and extracting the gallium oxide from the carbon dioxide decomposition mother solution and desiliconized solution. The method has the advantages of low material price, simple operating procedures, low investment, low production cost, low energy consumption and less slag.

The invention belongs to the field of casting technologies and new materials and particularly relates to a high-strength high-tenacity cast-state QT700-10 and a production method thereof. Compared with ductile iron produced in the prior art, the high-strength high-tenacity cast-state QT700-10 has high strength and a high elongation rate, heat treatment is not needed, heavy metal, such as, Ni and Mo are not added in production, the tensile strength Rm in the cast state is larger than or equal to 700 MPa, the elongation rate A is larger than or equal to 10%, compared with the standard brand QT 450-10, the lowest tensile strength is improved by 55% under the same elongation rate; and compared with the standard brand QT 700-2, the lowest elongation rate is improved by four times under the same tensile strength. The high-strength high-tenacity cast-state QT700-10 can meet requirements of automobile ductile iron castings with high requirements for safety and comprehensive mechanical properties.

The invention discloses a pretreatment method in the process of preparing titanium dioxide by reusing titanium dioxide acidolysis residues, which comprises the following steps of: crushing dried acidolysis residues, mixing raw materials by an acid mine, raising the temperature for acidolysis reaction; carrying out maturation reaction to generate solid-phase mixture; watering and leaching; mixing and settling; and obtaining a required product. With the adoption of the technical scheme, the pretreatment method has the beneficial effects that the reuse of the acidolysis residues as well as waste acid in the production process of the titanium dioxide can be better realized, so that the acidolysis rate of the titanium dioxide contained in the acidolysis residues reaches above 80 percent; the product obtained by pretreatment can be directly used for a sulfuric acid process to prepare the titanium dioxide, so that the recovery ratio of titanium is improved above 3 percent, a vast majority of titanium elements in the acidolysis residues are effectively recovered, and more than 30 percent of residue piling amount is reduced. The pretreatment method changes wastes into valuables and has important significance on effective utilization of resources and environment protection.

The invention provides a method for smelting low-carbon aluminium-killed steel, comprising the following steps: carrying out primary smelting by adopting a converter top and bottom combined blowing way, and then tapping molten steel obtained by the primary smelting into a steel ladle; blocking slag and predeoxidising in the tapping process, wherein the slag is blocked to ensure that the total content of FeO and MnO which enter the steel ladle is 3-5wt% of the molten steel entering the steel ladle, and the predeoxidising operation comprises the step of adding ferro-aluminium deoxidizer into the molten steel and can ensure that the oxygen content of the molten steel is 10-100ppm; carrying out primary aluminium feeding on the molten steel in the steel ladle before the molten steel in the steel ladle is refined after tapping is completed; refining the molten steel after the primary aluminium feeding is completed, and carrying out secondary aluminium feeding in the refining process; and removing impurities floating on the liquid surface of the molten steel. The invention also provides a method for continuously casting the low-carbon aluminium-killed steel, comprising the following steps: pouring the molten steel obtained by adopting the method for smelting the low-carbon aluminium-killed steel into a crystallizer, and continuously pulling and cooling. By adopting the method for smelting the low-carbon aluminium-killed steel, the purity of the molten steel can be obviously improved, and the accretion in the continuous casting process can be reduced.

The invention relates to a continuous casting crystallizer covering slag for high-carbon steel. The continuous casting crystallizer covering slag comprises the following components in percentages by weight: 22.90-37.0% of SiO2, 22.5-27.0% of CaO, 4.35-5.0% of MgO, 1.8-6.0% of Al2O3, 2.2-3.0% of Fe2O3, 9.0-12.0% of Na2O, 5.2-6.0% of F, 6.5-9.0% of C, not more than 2.0% of K2O, not more than 1.9% of Li2O, and the balance of water and impurities. According to the continuous casting crystallizer covering slag for high-carbon steel disclosed by the invention, the using amounts of Na2O and CaF2 are properly reduced, K2O and Li2O fluxing is added, and the slag not only has proper physicochemical performance but also has good glass property and lubricating property, so that the quality and yield of casting blanks are greatly improved, and the covering slag has high economic benefit and social benefit.

The invention discloses a numerical control plasma six-shaft five-linkage groove cutting machine. A rotating motor is installed on the top of a case of a host machine and connected with a ball screw rod in the case; the upper end of the ball screw rod is provided with a small gear, and the middle is in thread connection with a sliding block; one end of the sliding block is matched with a concave-convex groove of a vertical guide rail on the side wall of the case, and the other end is connected with a reset approaching switch; the reset approaching switch corresponds to a limiting block on the side wall of the case; the case is also provided with a hollow rotating shaft, and a big gear is connected to the rotating shaft; the big gear is meshed with the small gear; the lower end of the rotating shaft is fixed to the upper end of a C-shaped connecting piece; a reduction box driven by a swinging motor is installed on the C-shaped connecting piece and meshed with a semicircular rack by the gears; a cutting torch seat is installed on the rack; a cutting torch clamp is arranged on the contact surface of the cutting torch seat; a magnet is inlaid on the contact surface of the cutting torch seat; and a touch resistant approaching switch is vertically installed in a through hole of the clamp. The invention has the characteristics of accurate rotary resetting, verticality online compensation and high cutting precision.

The invention relates to a preparation method of a high-quality prebaked anode for a 500KA electrolytic cell. The method comprises the following steps of: (1) storing petroleum coke at different storage locations according to different producing areas; (2) crushing the petroleum coke blocks having the granularity greater than 200mm with a sledge hammer, sieving the petroleum coke blocks with the granularity less than 200mm, delivering the petroleum coke with the granularity less than 70mm into a petroleum coke conveyer belt, recrushing the petroleum coke with the granularity greater than 70mm so as to deliver the petroleum coke with the granularity less than 70mm into the petroleum coke conveyer belt; (3) feeding different petroleum cokes into a specified blending cabin, wherein the petroleum coke of one producing area is placed in each of the four blending cabins, and a belt weigher is arranged at the bottom of each blending cabin; (4) preparing calcined coke; (5) preparing rough coke, middle coke, fine coke and powdery coke; (6) preparing boiler-out thickeners; (7) preparing cooled thickeners; (8) preparing green bodies; (9) feeding the green bodies into a stacking storeroom for stacking; and (10) roasting the green bodies to obtain a prebaked anode. By using the preparation method, the electrolysis preparation requirement can be met, and safe and sable operation of the electrolytic cell is ensured.

The invention discloses a premelting buried arc composite refining slag and making method, which comprises the following steps: adopting premelting slag with grain size at 2-30mm as basic material; adding 10-30% foaming buried arc material; blending completely through machine; obtaining the product.

The invention discloses a high-toughness and anti-hydrogen induction sulfide stress corrosion crack metal powder flux-cored wire which comprises outer skin and a flux core; the outer skin is a low-carbon steel thin strip; the weight of the flux core accounts for 12 percent to 20 percent of the total weight of the wire; and the diameter of the flux core is 1.20mm to 2.4mm. According to the wire welding process, the process performance and physical and chemical properties are good, the amount of slag after welding is effectively reduced, welding of a plurality of layers is carried out without clearing the slag, so that the overall performance and the welding efficiency of a welding seam are effectively improved, the performance of the welding process is good, the electric arc is stable, splashing seldom occurs, the welding seam has attractive appearance, such purposes as vertical downward welding can be achieved through short-circuit transition; and good mechanical properties and the anti-hydrogen induced crack purpose are achieved.

A supporting method of a large-section soft rock large-deformation tunnel comprises the steps that after excavation is conducted by one footage, concrete is initially sprayed, then hole drilling is conducted, first restraining rods are fed into holes and grouted, and thus an upper initial lining support is formed; under the upper initial lining support, middle steps are excavated on the two sidesin a staggered mode, and then concrete is initially sprayed; after hole drilling, second restraining rods are fed into holes, concrete is re-sprayed to the designed thickness; lower steps are excavated on the two sides in a staggered mode, and then concrete is initially sprayed; after drilling, third restraining rods are fed into holes, the left sides and the right sides of the lower steps are backfilled; and a middle step reserved core soil part and a lower step reserved core soil part are excavated, then, an inverted arch is excavated, and the next cycle of construction is conducted till thetunnel breaks through. According to the support method of the large-section soft rock large-deformation tunnel, the support type is converted from internal supporting into external supporting, thus the space in the tunnel is saved, the safety and durability of the support structure are guaranteed, the safer, more economic and more durable effects and high operability are achieved while large deformation of the tunnel is effectively controlled, and the construction period is effectively shortened.

The invention belongs to a gas protective welding flux cored wire for welding heat resistant steel. The gas protective welding flux cored wire comprises low-carbon steel metal skin and a flux core, wherein the low-carbon steel metal skin comprises the following components in percentage by weight: 0.01 to 0.1 percent of C, 0.1 to 0.4 percent of Mn, 0.01 to 0.03 percent of Si, 0.005 to 0.015 percent of S, 0.005 to 0.015 percent of P and the balance of iron; the flux core accounts for 14 to 25 percent of the total weight of the welding wire and comprises the following components in percentage by weight: 1.2 to 3.0 percent of medium-carbon ferromanganese, 0.20 to 2.0 percent of ferrosilicon powder, 0.05 to 0.5 percent of magnesium powder, 1.5 to 2.0 percent of metal chromium powder, 0.2 to 2.0 percent of ferromolybdenum powder, 0.05 to 0.2 percent of electrically fused magnesia, 0.01 to 0.3 percent of fluoride and 7 to 15 percent of iron powder; and the components are mixed uniformly, the mixture is coiled on a thin steel strip made of low-carbon steel to form strips, and the strips are drawn to form wires. The gas protective welding flux cored wire has the characteristics of no molten slag on deposited metal after welding, capability of performing continuous multi-layer welding without slag removal, high welding process property, stable electric arcs, small splatter, attractive appearance of weld joints and the like, the welding efficiency is improved by 20 to 40 percent, and vertical downward welding can be realized by short circuiting transfer.

The invention discloses a UHPC lining structure used for a tunnel and a construction method of the UHPC lining structure. The UHPC lining structure is a composite lining structure composed of anchor rod supporting bodies and a UHPC lining supporting layer. Each anchor rod supporting body comprises an anchor rod hole, an anchor rod and a UHPC hole channel grouting material. The UHPC lining supporting layer comprises a water draining blind pipe, an injection UHPC lining layer, a decoration layer and a tunnel outline light reflecting bar. The UHPC lining structure used for the tunnel and the construction method of the UHPC lining structure have the following beneficial effects that the UHPC injection concrete supporting layer has high pressure resisting strength, high bending resisting strength, high toughness, high durability and good microcrack self-healing capability, UHPC is adopted as the tunnel project lining material, the lining structure construction speed is high, the supportingperformance is good, the thickness of the lining structure can be reduced obviously, and therefore the practical excavation sectional area and the slag generation amount of the tunnel can be reduced effectively, and the construction difficulty is lowered; and compared with a traditional tunnel supporting structure, the arrangement of a reinforcement net, a waterproof layer and a steel frame can beomitted, the construction efficiency is effectively improved, and the manufacturing cost is reduced.

In processing equipment, a machining portion of a subject (W) to be machined is irradiated with a laser beam (L2), an assist gas (G) is jetted toward the machining portion from a nozzle (3) coaxially arranged with the laser beam (L2) to cover the machining portion with the assist gas (G), and a piercing hole (H) is machined at the machining portion. The machining equipment is provided with a control means (10) for machining the piercing hole (H) while shifting the nozzle (3) within a range from a machining start point to 5mm, after starting irradiation of the laser beams (L2).

The invention relates to a production technology of a 6-series alloy bar for anodic oxidation. The production technology of the 6-series alloy bar for anodic oxidation includes the following steps that (1) mixing is performed; (2) refining is performed; (3) blowing is performed, specifically, after blowing is performed on an alloy aluminum liquid, the liquid is left to stand at 730-750 DEG C; (4)online degassing is performed; (5) double filtration is performed; and (6) casting is performed, specifically, cooling water casting is performed after the alloy aluminum liquid passes through an oil-gas slip casting flow table. According to the production technology of the 6-series alloy bar for anodic oxidation, an advanced oil-gas slip casting production line in China at present is used as a core, the industrial pure aluminum liquid with the purity being 99.85% is used, methods of semi-continuous casting, in-furnace homogenization treatment and double-filtering equipment are adopted, the 6-series aluminum alloy bar product for anodic oxidation can be prepared finally, grain distribution in a cast bar is uniform, the content of aluminum alloy slag is low through high-magnification structure inspection, and segregation tumors, cold shut and other phenomena do not exist on the surface of the alloy bar.

The invention discloses a high-efficiency steelmaking converter system. The high-efficiency steelmaking converter system comprises a converter, an oxygen lance system, an oxygen supply system, a tilting mechanism, a steel ladle, a control system, a thermal infrared imager, an image processing system and a display; the oxygen lance system is located above the converter, and is composed of a suspension rod, a hydraulic control system and an oxygen lance assembly; the hydraulic control system is mounted on the suspension rod; the oxygen lance assembly is mounted on the suspension rod by use of a lifting device; a backing ring is mounted on the converter; one side of the backing ring is connected with the tilting mechanism; an angle encoder is mounted on the other side of the backing ring; the angle encoder is connected with the tilting mechanism and the control system; the steel ladle is located between the converter and the thermal infrared imager; the thermal infrared imager is connected with the image processing system; the control system is connected with the image processing system; the display is further connected to the image processing system. The high-efficiency steelmaking converter system is capable of effectively improving the quality of molten steel and reducing the steelmaking cost.

The invention discloses a protecting pouring method of a crystallizer feeding a steel belt. The method comprises the following steps that (1) the liquid surface of the crystallizer is divided by a baffling board into a feeding area and a normal area, (2) when the crystallizer feeds the steel belt, casting powder is added in the normal area and the feeding area, hollow fireproof material balls are added in the feeding area, the width of the steel belt fed by the crystallizer is 10-20% of the width of the crystallizer, the thickness of the steel belt is 0.1-1% of the length of the crystallizer, and the feeding speed is 0.3-0.6m/s. The method is low in cost, simple and effective.

The invention discloses a method used for tapping through deflecting the bottom of a convertor, which is characterized in that the tapping opening of the converter is designed at the lower part of the converter; the position at the upper end of the tapping opening is arranged below a molten liquid surface; the lower end is higher than the slag surface after tapping in the convertor only with the slag left by 10 to 20cm; the diameter of the tapping opening is between 10 and 20cm; when the smelting reaches the end point, the converter is deflected by 20 to 60 degrees; the rotated angle leads the position of the tapping opening to be arranged at the lowest side of the converter; then the tapping opening is opened, the molten steel flows into a ladle arranged below the tapping opening; after the molten steel flows out, the converter is resumed to the normal vertical position and the ladle is removed, then the liquid surface of slag is lower than the lowest position of the tapping opening of the converter; then the ladle is arranged below the converter and the converter is deflected to lead the opening of the converter to face the lower side; and then the slag is spilled out from the opening of the converter. The method used for tapping through deflecting the bottom of a convertor solves the problem of slag during the tapping of the converter, ensures the slag amount of the converter to be lower than 0.5kg/t. Not only the rephosphorization of the molten steel can be reduced and the alloy recycling rate is improved, but also the occluded foreignsubstance in the steel can be reduced and the cleanness of the molten steel can be improved. Besides, the refining time can be shortened and the desulfurization degree can be improved.

The invention belongs to the technical field of steel-making pre-desulfurization and discloses a molten iron tank top and bottom composite blowing desulfurization method. Adopted equipment comprises a top-blowing structure arranged in a molten iron tank and a bottom-blowing structure arranged at the bottom of the molten iron tank. The bottom-blowing structure comprises a first bottom-blowing ventilation element, a second bottom-blowing ventilation element, a third bottom-blowing ventilation element, a fourth bottom-blowing ventilation element and a blowing device connected with the four bottom-blowing ventilation elements. The first bottom-blowing ventilation element and the second bottom-blowing ventilation element are arranged in the portions, at a one-second distance from the circular center radius, of the bottom of the molten iron tank, and the circle center angles of the first bottom-blowing ventilation element and the second bottom-blowing ventilation element to the circle center are each 90 degrees. The third bottom-blowing ventilation element and the fourth bottom-blowing ventilation element are arranged in the portions, at a one-third distance from the circular center radius, of the bottom of the molten iron tank, and the circle center angles of the third bottom-blowing ventilation element and the fourth bottom-blowing ventilation element to the circle center are each 90 degrees. According to the molten iron tank top and bottom composite blowing desulfurization method, the flow field dynamics in the blowing process of the molten iron tank is optimized, and the thermodynamic and dynamic conditions required for deep desulfurization are met.