33results about How to "Reduce chance of sticking" patented technology

The invention discloses a coating material for restraining excessive bonding during smelting reduction of iron ore pellets and a preparation method of the coating material, and belongs to the technical field of smelting reduction ironmaking. The coating material comprises, by weight, 83%-95% of high-melting-point inorganic materials, 2%-8.5% of waste plastic, 0.2%-3% of sodium carboxymethylcellulose, 1.2%-4.5% of starch and 0.1%-2.5% of calcium lignosulphonate. The preparation method of the coating material comprises the following steps of pretreatment of the coating raw materials, preparation of the coating material, smearing of the coating material and drying. The coating material provided by the invention can effectively restrain excessive bonding between the iron ore pellets in the pre-reduction process of a smelting-reduction ironmaking technique, the coating material and the iron ore pellets are firmly bonded, and a coating can be effectively prevented from cracking and falling; and meanwhile, it is guaranteed that the metallization ratio of reduction products is high.

The invention relates to a method of preparing high-alkalinity chromium-containing all-vanadium titaniferous pellets by adding calcium carbonate. The method comprises the following steps that S1, batching is performed, calcium carbonate and sodium-based bentonite ingredients are added into red-lattice chromium-containing vanadium titano-magnetite; S2, the mixture is divided into two parts, the first part of the mixture material is added with 3-4% of water by mass, the second part of the mixture material is added with the 6-8% of the water by mass, and wet mixing and leaving the materials to stand to ferment are performed correspondingly; and S3, material dividing and pelletizing are performed, pelletizing is performed on a disk pelletizer with revolving speed of 30-45 r / min, the water spraying amount is controlled to be 1-2 ml / 10 g of mineral aggregates, and the water adding and material feeding are performed per 30-100 seconds at intervals; the first part of mineral aggregates are used for pelletizing in the forming period of a master ball, and the second part of ore material aggregates are used for pelletizing in the growth period of the mother ball; S4, drying is performed; S5,the calcium carbonate is decomposed, pre-oxidated and pre-roasted, the calcium carbonate is decomposed and pre-roasted firstly at the temperature of 900-950 DEG C, and then insufficient amount of airis introduced into a furnace for pre-oxidation and pre-roasting; and S6, high-temperature oxidation consolidation roasting is performed, the incremental air is introduced into the furnace at the temperature of 1250-1300 DEG C to perform the high-temperature oxidation consolidation roasting, after sintering is completed, cooling is performed to prepare the high-alkalinity chromium-containing all-vanadium titaniferous pellets.

The invention provides a gas-based reduction method and system for granular iron ore and application, and relates to the technical field of smelting. According to the gas-based reduction method, pure oxygen and high-calorific-value fuel gas are not needed, natural gas is used as a raw material, compressed natural gas is converted into hydrogen-rich gas through desulfurization, steam reforming, shift reaction, first dehydration treatment and first CO2 removal treatment, the hydrogen-rich gas is preheated to be in countercurrent contact with the granular iron ore with a specific particle size and a specific preheating temperature to conduct a reduction reaction so as to prepare the granular directly reduced iron; and due to the fact that the particle size of the granular iron ore is small, the reduction reaction speed at the same temperature is higher than that of traditional pellets, other binders and sintering processes do not need to be introduced, pollution is greatly reduced, meanwhile, the granular iron ore at the specific preheating temperature and the hydrogen-rich gas are directly subjected to the reduction reaction, and the reduction reaction at low temperature is realized by utilizing the heat of the granular iron ore and the hydrogen-rich gas.

The invention provides a drill bit of a variable-curvature screw pile driver. The drill bit comprises a drill stem, a drill point, a screw blade and a drill pick; the curved surfaces of the two sides of the drill pick are an inner soil contacting curved surface and an outer soil contacting curved surface, respectively; the profile curve of the inner soil contacting curved surface of the longitudinal section of the drill pick and the profile curve of the outer soil contacting curved surface of the same conform to different equations, respectively; the drill point is composed of three drill point base bodies which are symmetrical to each other about the center of circle of an end face, going into soil, of the drill stem. The drill bit of the variable-curvature screw pile driver has the advantages that the equation curves adopted by the drill bit are optimized based on tests, the bionic curves applied to the inner and outer soil contacting curved surfaces are derived from cock toe soil contacting curved surfaces, the inner and outer soil contacting profile curves of the cock toes have excellent soil resistance reduction and desorption capability, and once the structures are applied to the drill pick part of the drill bit of the pile driver, the pile driver is enabled to have excellent soil excavation capability, and meanwhile, the soil resistance to the drill bit is also reduced, and therefore, the service life of the drill bit can be prolonged and the working efficiency of the drill bit can be improved.

A material for inhibiting biological adhesion at least comprises the preparation raw materials: resin, a functional material and an active material; the functional material at least comprises an antibacterial composition and salt, and the active material at least comprises a nonionic surfactant. The invention further provides an application of the material for inhibiting biological adhesion in thefields of transportation, constructional engineering, mechanical equipment and packaging engineering.

The invention discloses an efficient treatment system of oil sludge. The TPH (total petroleum hydrocarbons) content of the oil sludge treated is less than 1%. The oil sludge enters a dryer with a stirrer and an outer heating coil and is subjected together with hydrogen separated by a nitrogen making machine, to heat exchanging via heat transfer oil, a resulting product is subjected with oil sludge directly to convection drying, cracking heat of a thermal desorption unit performs on indirect heating on the oil sludge through the outer heating coil of the dryer, viscosity of the oil sludge is decreased after free water, interstitial water and part of light gases are removed, chances that the oil sludge cake in the heat desorption unit are also slimmed, and long-term running of the thermal desorption unit is guaranteed; the dryer with the stirrer and the outer heating coil uses the cracking heat of the thermal desorption unit, thus energy is saved; gases subjected to oil removal, dust removal and odor removal are used as fuels for a combustor, thus energy is saved; high-hydrogen gas from the dryer with the stirrer and the outer heating coil separates oil and water through bubbles generated by an air flotation machine, oil-water separation is efficient, and the separated oil is used as a fuel for the combustor, thus energy is saved.

The invention discloses a dredging device for aquaculture fish pond, which comprises a vehicle body and wheels; the wheels are installed on both sides of the vehicle body; the wheels include a first wheel and a second wheel; The left side of the direction, the second wheel is installed on the right side of the dredging device's travel direction; the wheel is equipped with an air bag; the bottom of the vehicle body is provided with a slide plate; the front end of the vehicle body is equipped with a balance chamber; The front end of the vehicle body is equipped with a sewage suction device; the sewage suction device is equipped with a jet device; the interior of the vehicle body is also provided with a transfer device; the underwater steering is smoother through the cooperation of the wheels and airbags; the cooperation of the sliding plate and the balance chamber can The weight of the front end of the vehicle body is dynamically controlled to ensure that the front end of the vehicle will not sink into the silt while driving; the jet device is used to spray high-pressure water to effectively disperse the sludge at the bottom of the pond; the transfer device can effectively break up the sludge in the sewage.

The invention relates to a method for preparing high-alkalinity chromium-containing vanadium-titanium pellets by adopting calcium oxide. The method comprises the following steps of mixing the raw materials including vanadium titano-magnetite, additive calcium oxide powder and sodium bentonite, so that the alkalinity of the raw materials is 1.8 to 2.1, drying and drying respectively, and carrying out dry mixing and mixing; averagely distributing the mixed ore materials into two parts, adding water accounting for 3% to 4% of the total mass of the raw materials in the first part, adding water with the total mass of 6% to 8% of the total mass of the raw materials in the second part, uniformly mixing, and hermetically standing; when pelletizing is carried out, a first part of mineral powder isused in the forming period of the master ball, a second part of mineral powder is used in the growth period of the master ball, the water spraying amount before the growth of the master ball is controlled to be 1ml of 10g of ore powder to 2ml of 10g of ore powder of mineral powder, preventing adhesion between the master balls, and adding water for 40 seconds to 90 seconds at each time, so that thediameter of the prepared pellets ranges from 8mm to 12mm; and preparing raw ball braised material, drying, pre-xidizing and roasting, carrying out secondary high-temperature oxidation roasting to obtain high-alkalinity chromium-containing vanadium-titanium pellets.

The invention relates to a method for preparing medium-low-alkalinity chromium-containing all-vanadium-titanium self-fluxing pellets. The method comprises the following steps of S1, ingredient, addingcalcium carbonate and sodium-based bentonite into red-lattice chromium-containing vanadium titano-magnetite, and preparing a medium-low-alkalinity mixture; S2, wet-mixing and braising, adding water which does not exceed 7% of the mass of the mixture, and uniformly mixing; and then standing is carried out, so that the humidity is uniformly distributed; S3, pelletizing is carried out, wherein 30r to 40r per minute is used on a disc pelletizer, the water spraying amount in the forming period of the mother ball is controlled to be every 10 g is provided with1ml to 2ml of mineral materials, and fully rolling and compacting the ore materials, increasing the water spraying amount in the growth period of the mother balls to obtain the diameter of 6mm to 13mm; S4, drying the green pellets; S5, placing the green pellets in a furnace to be heated to 900 DEG c to 950 DEG c , and in the heat preservation condition, introducing insufficient amount of air into the furnace for pre-oxidation roasting,wherein the roasting time is 10minutes to 20minutes; S6, and carrying out high-temperature oxidation consolidation roasting, introducing the increment air into a furnace of 1250 DEG c to 1300 DEG c to increase the oxidizing atmosphere, carrying out high-temperature oxidation consolidation roasting, and then cooling to room temperature to prepare the medium-low-alkalinity chromium-containing all-vanadium-titanium self-fluxing pellet.

The invention discloses a continuous-casting mold flux for decreasing sticking steel breakouts and a preparation method thereof. The continuous-casting mold flux for decreasing the sticking steel breakouts comprises the following chemical components of, by weight, 32.5-35.5 percent of SiO2, 29.5-31.5 percent of CaO, 1.5-3.0 percent of MgO, 2.2- 3.0 percent of Al2O3, 0.5-1.5 percent of Fe2O3, 11.0-13.0 percent of Na2O, 10.0-12.0 percent of F-, 3.0-4.0 percent of C solid and the balance unavoidable impurity, wherein the binary basicity is 0.87 to 0.93; a melting point is 1050 to 1070 DEG C; and the viscosity below 1300 DEG C is 0.115Pa*S to 0.135Pa*S. In the practical application of the mold flux, a flame in a crystallizer is uniform; the spreadability is better; caking and agglomerating phenomena do not exist; a melt cinder is stable; the lubrication is sufficient; and the rate of the sticking steel breakouts can be decreased to below 5 percent from original 10 to 20 percent.

The invention discloses a polycrystalline diamond composite sheet with anti-adhesion properties, which comprises a cemented carbide substrate and a polycrystalline diamond layer compounded thereon, and a groove structure is arranged on the blade surface of the polycrystalline diamond layer; the groove The groove structure includes several radial grooves arranged radially along the radial direction of the blade surface, which divide the blade surface into several sectors, and several arc-shaped circumferential grooves connected with the radial grooves , a number of circumferential grooves are concentrically distributed with the center of the blade face as the center of a circle, and the circumferential grooves of adjacent sectors are arranged alternately. The polycrystalline diamond composite sheet with anti-adhesion characteristics of the present invention has a large number of grooves on the blade surface, so that the contact area between the cuttings and the blade surface is small, and the adhesion is reduced; drilling fluid can enter the grooves, lubricate On the face of the composite blade, the cuttings can be carried by the drilling fluid out of the bottom of the well, thus avoiding the adhesion and accumulation of the cuttings in front of the composite blade, fundamentally preventing the formation of the bag of PDC bit.

The invention provides a drill bit of a variable-curvature screw pile driver. The drill bit comprises a drill stem, a drill point, a screw blade and a drill pick; the curved surfaces of the two sides of the drill pick are an inner soil contacting curved surface and an outer soil contacting curved surface, respectively; the profile curve of the inner soil contacting curved surface of the longitudinal section of the drill pick and the profile curve of the outer soil contacting curved surface of the same conform to different equations, respectively; the drill point is composed of three drill point base bodies which are symmetrical to each other about the center of circle of an end face, going into soil, of the drill stem. The drill bit of the variable-curvature screw pile driver has the advantages that the equation curves adopted by the drill bit are optimized based on tests, the bionic curves applied to the inner and outer soil contacting curved surfaces are derived from cock toe soil contacting curved surfaces, the inner and outer soil contacting profile curves of the cock toes have excellent soil resistance reduction and desorption capability, and once the structures are applied to the drill pick part of the drill bit of the pile driver, the pile driver is enabled to have excellent soil excavation capability, and meanwhile, the soil resistance to the drill bit is also reduced, and therefore, the service life of the drill bit can be prolonged and the working efficiency of the drill bit can be improved.

The invention discloses a coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction and a preparation method thereof, belonging to the technical field of smelting reduction ironmaking. The coating material of the present invention is composed of the following components in weight percentage: 83-95% of high melting point inorganic materials, 2-8.5% of waste plastics, 0.2%-3% of sodium carboxymethyl cellulose, 1.2%-4.5% of starch, Calcium lignosulfonate 0.1%-2.5%; the preparation method of the coating material of the present invention comprises the following steps: coating raw material pretreatment, coating material preparation, coating material coating and drying. The coating material of the present invention can effectively inhibit the excessive bonding between iron ore pellets in the pre-reduction process of the smelting reduction ironmaking process, and the coating material and the iron ore pellets are closely combined, which can effectively prevent the coating from cracking and falling off, and at the same time ensure The metallization rate of the reduced product is at a high level.

The invention relates to a method of preparing high-alkalinity chromium-containing all-vanadium titaniferous pellets by adding calcium carbonate. The method comprises the following steps that S1, batching is performed, calcium carbonate and sodium-based bentonite ingredients are added into red-lattice chromium-containing vanadium titano-magnetite; S2, the mixture is divided into two parts, the first part of the mixture material is added with 3-4% of water by mass, the second part of the mixture material is added with the 6-8% of the water by mass, and wet mixing and leaving the materials to stand to ferment are performed correspondingly; and S3, material dividing and pelletizing are performed, pelletizing is performed on a disk pelletizer with revolving speed of 30-45 r / min, the water spraying amount is controlled to be 1-2 ml / 10 g of mineral aggregates, and the water adding and material feeding are performed per 30-100 seconds at intervals; the first part of mineral aggregates are used for pelletizing in the forming period of a master ball, and the second part of ore material aggregates are used for pelletizing in the growth period of the mother ball; S4, drying is performed; S5,the calcium carbonate is decomposed, pre-oxidated and pre-roasted, the calcium carbonate is decomposed and pre-roasted firstly at the temperature of 900-950 DEG C, and then insufficient amount of airis introduced into a furnace for pre-oxidation and pre-roasting; and S6, high-temperature oxidation consolidation roasting is performed, the incremental air is introduced into the furnace at the temperature of 1250-1300 DEG C to perform the high-temperature oxidation consolidation roasting, after sintering is completed, cooling is performed to prepare the high-alkalinity chromium-containing all-vanadium titaniferous pellets.

The invention relates to a method for preparing middle and low alkalinity all-vanadium-titanium self-fluxed pellets through calcium oxide. According to the method, vanadium-titanium ore powder, calcium oxide powder and sodium bentonite are dried first, and then are subjected to dry mixing, water is added for matching, and uniform material mixing and closed standing are performed; pelletizing is performed, the water spraying amount is controlled at 1ml / 10g ore powder to 2ml / 10g ore powder before growing of mother balls, and the interval between water adding and material adding each time is 45 seconds to 90 seconds, the ore powder sufficiently rolls to be compacted, and green ball pellets are made; green balls are subjected to material braising; drying is performed, and then pre-oxidizing roasting is performed; and temperature rises, secondary high temperature oxidizing roasting is performed, then cooling is performed, and the middle and low alkalinity high chrome type all-vanadium-titanium self-fluxed pellets are made. The method solves the problems that the green balls are low in strength, low in compressive strength and large in humidity, and prone to pulverization, bursting and the like after drying, and the middle and low alkalinity high chrome type all-vanadium-titanium self-fluxed pellets are made. The made pellets meet the furnace entering requirement of a blast furnace,improves the pellet ore-forming efficiency and lowers cost.

The invention discloses a stabilizing device for a tin bath hot-end glass strip, solves the problem of poor transverse stability of the glass strip in the prior art, overcomes the disadvantages of the stabilizing device for the tin bath hot-end glass strip without regional adjustment, reduces accidents, such as loosing of edge of the glass strip and the like and improves the production quality. The adopted technical scheme is that: the structure comprises a base at a lower layer and a graphite device, wherein the graphite device is fixed on the base through a connecting bolt and provided witha groove for holding tin-lead mixed melt; and a cooling device is arranged in the groove of the graphite device. By effectively adjusting the contact condition of the stabilizing device and the tin bath hot-end glass strip, the stability of the tin bath hot-end glass strip is obviously improved, the accidents, such as loosing of edge of the glass strip and the like, are greatly reduced, and the production quality of ultra-thin glass is greatly improved. The stabilizing device has the advantages of simple structure, high practicability and good stabilizing effect.