71results about How to "Increase cold strength" patented technology

The invention relates to a high-ore-matching-ratio brown iron ore sintering technology. The weight ratio of brown iron ore and powdered iron in raw material proportion is (5-19):1, the moisture content of the first mixing is controlled to be 7%-8%, the mixing time lasts for 2-3minutes, and the temperature of the mixture is 50-62 DEG C; the moisture content of second mixing pelletizing is controlled to be 7-9%, the pelletizing time lasts for 2-3.5minutes, and the temperature of materials is 52-65 DEG C; the thickness of grate-layer materials in distribution is 20mm, and a sintering material layer is 780-900mm thick; the ignition temperature for sintering is1050-1150 DEG C, and the ignition time lasts for 1.8-2.2minutes; and the negative pressure for sintering is 12-15kpa, the machine speed is 0.9-1.2m/min, the vertical sintering speed is 29-34mm/min, the air leakage rate is no more than 40%, the cooling negative pressure is 11-14kpa, the temperature of a cooling section of a sintering machine is reduced to 250 DEG C below. By using the high-ore-matching-ratio brown iron ore sintering technology, energy is saved, consumption is reduced, cost is decreased and benefit is increased.

The invention relates to a low-cost blast furnace iron-smelting method, which is characterized in that: blocky carbon-lan (semi-coked) and rammed coke are matched and used for blast furnace iron smelting, and at the same time, small-particle or powdery carbon-lan (semi-coked) is used as an injected fuel to be used for blast furnace iron smelting. In the method, rammed coke is adopted, thus the consumption of high-quality coking coal is reduced, and the cost of the coking blend is lower than that of the top charging coke; and at the same time, a part of non-coking coal carbonization product, namely carbon-lan (semi-coked) is matched, thus the production cost of steel enterprises is lowered to a greater extent and high-quality coking coal is saved. In addition, small-particle or powdery carbon-lan (semi-coked) is used as the injected fuel, thus the problems that anthracite, lean coal and meager lean coal resources are limited and expensive are alleviated and the production cost of the steel enterprises is further lowered. According to the invention, the problems of shortage in high-quality coking coal resources and high-quality blowing coal resources in China are solved to a certain extent, and a new way is opened for persistent health development of the steel enterprises.

A process for sintered-ore production in which high-quality sintered ore having high strength can be safely produced in a high yield with a sintering apparatus of a downward suction type; and the sintering apparatus. The process for sintered-ore production comprises: placing a raw material to be sintered comprising fine ore and a carbon material, on a circulating pallet (8) to form a raw-material layer (9); igniting the carbon material of the raw-material layer in an ignition furnace; and sucking air with a wind box disposed under the pallet to thereby produce sintered ore. After the raw-material layer (9) has been ignited in the ignition furnace, a liquid fuel is atomized to a particle size of 100 [mu]m or smaller and supplied to over the raw-material layer (9), and the atomized liquid fuel is supplied from over the raw-material layer (9) into the raw-material layer (9) after having been diluted at least to the lower limit of ordinary-temperature combustion concentrations. The sintering apparatus has, disposed downstream from the ignition furnace, a liquid-fuel injector which injects the liquid fuel over the raw-material layer.

The invention discloses a method for producing carbonized coal/coke for gasification by a large tamping briquette on a coke oven. The method comprises the steps of adding a coal modified adhesive and a spheroidizing agent into non-caking feed coal; humidifying a mixed coal material, conveying to a high-density tamping molding machine, and pressing to obtain a large briquette of which the density is 1.15-1.30g/cm<3>; then conveying the tamped large briquette into a tamping coke oven carbonization chamber, and carbonizing for 15-30 hours at 850-1100 DEG C to obtain the carbonized coal/coke for gasification. The method disclosed by the invention realizes large-scale production of the carbonized coal/coke for gasification; a product has the characteristics of high mechanical strength, good thermal stability, high gas generation rate, less pollutant emission and the like, and is a high-quality fixed bed gasification raw material.

The present invention relates to a cold-rolling method for cold-rolling a wrought Mg alloy with a weak or non-basal texture as well as a cold-rolled sheet, the method comprising the steps of: pre-treating a billet of the wrought Mg alloy with a weak or non-basal texture, and then cold rolling it; wherein the weak or non-basal texture plane of said billet is selected as a rolling plane, and the rolling direction is parallel to the rolling plane; and said billet is cold rolled at room temperature to a sheet or foil with a thickness of 0.1 to 100 mm, wherein single-pass or multi-pass rolling is used, and the cold rolling is followed by an annealing at 200 to 400° C. for 10 min to 48 h.

The invention provides a high-heat-strength CaO carbon-containing pellet and its preparation method and application. The preparation method of the CaO carbon-containing pellet is: after mixing calcium-based powder, carbon-containing powder, inorganic binder and water The calcium-based carbon-containing pellets are obtained by cold pressing; the calcium-based carbon-containing pellets are optionally placed for a certain period of time, and then dried and calcined under control to obtain the CaO carbon-containing pellets. The thermal strength of the CaO carbon-containing pellets can reach up to 19Mpa at 1200°C, and can be greater than 10MPa at 1300°C; since the raw material is powder, the temperature for preparing calcium carbide is greatly reduced, and can be at 1800‑2000 ℃ to prepare calcium carbide; it solves the problem of large-scale recycling of solid waste in the coal chemical industry, and at the same time prepares high-performance and high-quality raw materials for calcium carbide production, reducing the energy consumption of calcium carbide production.

The invention discloses a method for improving the cold strength of coke, which comprises the following steps: 1, gas coal crushing: gas coal with the granularity of less than 6 mm from a production plant is fed into a crusher for crushing, performing screening analysis on the granularity of the gas coal after crushing according to the requirement of the proportion of the granularity of less than3 mm in the crushed gas coal to be 48-53%; 2, blending of blended coal: the crushed gas coal is blended with 1/3 coking coal, fat coal and lean coal according to the requirements of coal blending, themass ratio of the gas coal in the whole blended coal is 25.5-27%, the ash content Ad of the blended coal is 8-10%, and the volatile matter VMd of the blended coal is 26-28%; 3, crushing and mixing ofthe blended coal: the blended coal is added into a crusher for repeated crushing, the groove spacing of the crusher is 3-4 mm, and the mass ratio of the blended coal with the particle size smaller than 3 mm after crushing is 84-86%; and 4, moisture adjustment and preparation of high-strength coke.

The invention relates to a briquette for a gas producer produced by high volatile bituminous coals and a method. The briquette can meet the requirements of the two-stage fixed bed gas producer for coal quality. The briquette is characterized in that: aiming at the characteristics of high bituminous coal forming elasticity, anthracite coal with the weight 10-20% of that of the bituminous coal is added by weight percentage and is taken as a carbon skeleton, thereby improving the cold strength of the briquette formed by the bituminous coals; modified clay with the weight 4-6% of that of the bituminous coal is added by weight percentage and is taken as a thermal intensifier, and simultaneously a sodium humate binder with the weight 4-6% of that of the bituminous coal is formed by cold pressing, thereby not only improving the cold strength of the briquette, but also not reducing the fixed carbon content of the briquette so as to ensure the heating value and gas production quantity of the briquette; and a small amount of modified clay is added to improve the thermal strength and thermal stability of the briquette, and can be used as a catalyst in the gasification process simultaneously,thereby improving the gasification activity of the briquette.

The invention relates to a method for producing calcium carbide pellet raw material by recycling calcium carbide furnace gas fly ash, semi-coke powder and lime powder. The method comprises the following steps: (1) uniformly mixing the calcium carbide furnace gas fly ash, semi-coke powder and lime powder in a proper ratio according to composition of the raw material, so that a mixture is obtained; (2) adding water into the mixture and humidifying, adding composite adhesive at the same time, uniformly stirring by adopting a stirring machine and then carrying out ageing and homogenizing treatment; (3) feeding the aged powdery product into a roll-type forming machine to be formed, so that solid pellets in a certain shape are obtained; and (4) drying the solid pellets by utilizing hot flue gas generated in combustion of a hot air furnace. The method provided by the invention utilizes solid waste produced in calcium carbide production, and environmental pollution is avoided; and the composite adhesive is added, so that heat intensity of the pellets is improved, and organic adhesive improves cold intensity of the pellets.

The invention discloses a method for molding a raw material for the production of calcium carbide. The method comprises the following steps: (1) respectively pulverizing semicoke, quick lime, coal and a binder to obtain a semicoke powder, a quick lime powder, a coal powder and a binder powder; (2) respectively drying the semicoke powder, the quick lime powder, the coal powder and the binder powder; (3) mixing the dried semicoke powder, the dried quick lime powder, the dried coal powder and the dried binder powder at the preset ratios to obtain a mixed material; (4) compressing and molding the mixed material to obtain the prepared molding material; and (5) pyrolyzing the prepared molding material to obtain the raw material for the production of calcium carbide. By using the method, the molding material with excellent cold strength, heat strength and fall strength is effectively prepared, and in addition, an effective solution is found for the recycle of the powdery semicoke.

The invention discloses an environment-friendly industrial briquette composite binder and a preparation method thereof. Humic acid, alumina, common seepweed herb seed cake meal, water and the like are used as raw materials; the preparation process is simple and convenient; the briquette prepared by the method has the advantages of little drop of the solid carbon content, good binding property, high pelletizing rate, high cold/hot strength, good thermal stability, low cost, short production cycle and the like.

The invention discloses a lignin iron powder ball compound adhesive and a preparation method thereof. The iron powder ball adhesive is prepared from the following ingredients of sulfur-free large molecular weight lignin, oxidized starch and an inorganic fluxing agent. The adhesive is added into an iron powder raw material according to a certain proportion to be fully and evenly stirred, the defined amount of water is sprayed to form a mixture with viscosity, and the mixture is put into a ball pressing machine to be manufactured into iron powder balls. The iron powder balls are sent into a drying stove and pass through a low-temperature area, a middle-temperature area and a high-temperature area to be dried and roasted to be solidified into the iron powder balls with certain strength. As the iron powder adhesive use amount is larger, the large molecular weight lignin without sulfur and alkali metal is utilized as a main ingredient of the iron powder ball adhesive disclosed by the invention; thus, an effective path is provided for application of bulk lignin raw materials.

The invention discloses an ore blending method based on the high-temperature metallurgical performance of iron ore powders. The method comprises selecting a plurality of iron ore powders of differentorigins to test and analyze the high-temperature metallurgical performance of the different iron ore powders; obtaining a mathematical model of high-temperature metallurgical performance values and chemical components through data analysis; matching the advantages and disadvantages of the high-temperature metallurgical performance of the iron ore powders to obtain mixed powders with excellent high-temperature metallurgical performance and suitable for sintering. The method of the invention reveals a relation between the high-temperature metallurgical performance values and the chemical components of the single ore and the mixed ore, optimizes the ore blending based on this, and can obtain mixed ore with excellent high-temperature metallurgical performance, contributes to sintering and an increase in yield, and improves sintering ore quality. In addition, when mixing ore, by means of the complementation of the high-temperature metallurgical performance of different iron ore powders, themethod increases the proportion of non-mainstream low-priced ore, and reduces the cost of sintering raw materials.

The invention relates to the technical field of metallurgy, and discloses a preparation method of iron-containing dust sludge pellets, which optimizes the components and preparation technique of the iron-containing dust sludge pellets by controlling the types of raw material dust sludge and combining the metallurgical thermodynamics theory. According to the preparation method of the iron-containing dust-mud pellets, recovery of iron elements can be achieved, meanwhile, S elements possibly entering molten iron are effectively controlled, the S elements are reserved in slag and removed in the slag falling process of the molten iron, and the quality of the molten iron is guaranteed.

The invention relates to a humolite composite adhesive for producing gas making coal rods and a preparation method thereof. The humolite composite adhesive is prepared from the following raw materials in parts by weight: 1400-1800 parts of humolite powder, 40-60 parts of maize powder, 200-400 parts of calcium bentonite and 140-160 parts of sodium hydroxide. The preparation method comprises the following steps: adding water into a reaction tank, adding the raw materials, and carrying out chemical composite reaction under heating conditions. When smokeless powder coal and the composite adhesive are used for producing the gas making coal rod, the cold state compression strength of the coal rod is 60-70 kilograms, the hot strength and heat stability of the coal rod are high, and the heat stability is 70% above; and the coal rod has high chemical activity and obvious energy-saving effect.

The invention relates to an adhesive for zinc-containing fly ash pellets of a rotary hearth furnace and a preparation method. The adhesive comprises raw materials mixed according to a certain proportion, and the adhesive is characterized in that the raw materials comprise the following components in percentage by mass: 0-2% of amide, 0-8% of CMC, 40-50% of pregelatinized starch, 0-5% of sodium carbonate, 0-5% of baking soda, 20-30% of alumina powder and 15-25% of bentonite; the raw materials are mixed, specifically, 0-2% of amide, 0-8% of CMC, 40-50% of pregelatinized starch, 0-5% of sodium carbonate, 0-5% of baking soda, 20-30% of alumina powder and 15-25% of bentonite in percentage by weight are prepared and uniformly mixed and stirred; and the adhesive for the zinc-containing fly ash pellets of the rotary hearth furnace is small in dosage, small in ash content and high in strength, harmful substances capable of reducing the iron grade are not introduced, the pellets do not disintegrate and do not pulverize at high temperature, and the prepared pellets are high in dezincification rate, resistant to high temperature, good in reducibility and high in metallization rate.

The invention provides a method for preparing formed coke. The method comprises the following steps: 1, preparing a sodium silicate aqueous solution and a sodium bentonite aqueous solution; 2, adding coal tar, the sodium silicate aqueous solution and the sodium bentonite aqueous solution into pulverized coal, uniformly mixing, filling a steel mold with the mixture, performing cold press molding by utilizing a hydraulic press, and demolding to obtain a blank material; and 3, drying the blank material in a drying oven, and naturally cooling to obtain the formed coke. The formed coke prepared by adopting the method is an organic-inorganic composite material, and novel formed coke with high cold strength can be produced by adopting the cold press molding method; and the type of coal mines can be selected without strict requirements, and formed coke with high tumbler strength can be prepared by utilizing lean coal, meager lean coal and other weak caking coal.