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316results about How to "Increase dosage" patented technology

High-strength low-temperature-resisting spheroidal graphite cast iron and preparing method thereof

The invention relates to the field of spheroidal graphite cast iron, in particular to high-strength low-temperature-resisting spheroidal graphite cast iron and a preparing method thereof. The spheroidal graphite cast iron comprises, by mass percent, 3.2% to 3.5% of carbon, 2.1% to 2.3% of silicon, 0.4% to 0.5% of manganese, 0.4% to 0.6% of copper, 0.2% to 0.4% of nickel, 0.2% to 0.4% of molybdenum, 0.04% to 0.06% of magnesium, 0.05% to 0.08% of chromium, 0.005% to 0.008% of titanium, 0.002% to 0.003% of vanadium, not larger than 0.04% of phosphorus, not larger than 0.02% of sulphur and the balance iron. The preparing method of the high-strength low-temperature-resisting spheroidal graphite cast iron comprises following steps: firstly, raw materials are smelted; secondly, spheroidizing treatment and inoculation are carried out; and thirdly, heat treatment is carried out. Through reasonable arrangement of all element components, the tensile strength of the spheroidal graphite cast iron is improved, a proper nucleating agent is prepared, internal inoculation matched with inoculation in a ladle is adopted, the inoculation effect is reinforced, meanwhile, during heat treatment, the heating temperature, the heat preservation time, the cooling rate and the manner are reasonably arranged, the strength and low temperature resistance of the iron are effectively improved, the spheroidal graphite cast iron is high in strength and excellent in low temperature resistance, and the preparing method is simple and efficient.
Owner:HANSHAN COUNTY XINGDA DUCTILE IRON FACTORY

High-performance silver cadmium oxide material and manufacturing method thereof

The invention relates to a high-performance silver cadmium oxide material and a manufacturing method thereof, which are characterized in that the silver cadmium oxide material comprises the following components: 85 to 97 percent of silver, 2 to 15 percent of cadmium, 0.01 to 0.5 percent of nickel, 0.01 to 1 percent of tin and 0.01 to 0.5 percent of rear earth mixture. The manufacturing method of the high-performance silver cadmium oxide material is characterized in that: a given quantity of silver, cadmium, nickel, tin and rare earth mixture are measured to be arranged inside a middle-frequency induction furnace to be smelted and cast, the cast ingot is extruded by an extruding machine to be thick wires, the thick wires are stretched by a wire-drawing die to be thin wires, the thin wires are pre-oxidized by an internal oxidization furnace, then the thin wires are cut and preformed and finally is processed and formed. The anti-oxidization performance, electric-arc burning loss resistance and the abrasion resistance of the silver cadmium oxide material are improved, and the service life is prolonged, so the high-performance silver cadmium oxide material can be applied to different working environments, has low production cost, simple manufacturing method and low requirements on the device and the production.
Owner:SHANGHAI LONGSUN ALLOY CO LTD

Method for preparing non-sintered ceramsite by adding dredged sludge

The invention relates to a method for preparing non-sintered ceramsite by adding dredged sludge. The method comprises the following steps: (1) pre-treatment of the dredged sludge; (2) material preparation: mixing and stirring smashed dredged sludge, cement, quick lime, gypsum and coal ash to prepare a dry mixture; the mass portions of the smashed dredged sludge, cement, quick lime, gypsum and coal ash are as follows: 60 to 80 parts of the dredged sludge, 1 to 6 parts of the cement, 1 to 6 parts of the quick lime, 1 to 6 parts of the gypsum and 3 to 15 parts of the coal ash; then uniformly mixing water glass with water to obtain a mixed solution of the water glass and the water, wherein the mass ratio of the adding amount of the water glass to the dredged sludge is 3 to 15: 60 to 80, and the adding amount of the water accounts for 40 to 60 percent of the total mass of the dry mixture and the water glass; (3) disc granulation; (4) primary curing of a product; (5) waterproofing work; (6) ultimate curing of the product, namely obtaining a finish product of the non-sintered ceramsite. According to the method provided by the invention, a large amount of dredged sludge can be added, the purpose of utilizing waste materials is realized, the requirements of a dredging Industry are met, the production energy consumption is low, and the produced non-sintered ceramsite can meet the demands of construction market.
Owner:TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Self-compacting concrete prepared from iron ore tailings, and preparation method thereof

The present invention discloses a self-compacting concrete prepared from iron ore tailings, and a preparation method thereof. The self-compacting concrete is prepared through adding 38.00-46.00% of a coarse aggregate, 23.00-37.00% of a fine aggregate, cement, 15-24% of a cementing material and 0.30-0.48% of an additive to water. The coarse aggregate is prepared through mixing crushed stones with particle sizes of 5-20 mm. The fine aggregate is the mixed sands prepared from iron ore tailings and machine-made sands or natural sands, wherein the mixed sands meet the technical requirements of thesands in the region II, preferably that a mass ratio of the iron ore tailings to the machine-made sands or the natural sands is 3:7-7:3. The cementing material is a mixture, wherein the mixture comprises cement, fly ash and ground slag powder. A mass ratio of the water to the cementing material is 0.30-0.50. The additive is a mixture, wherein the mixture comprises a water reducing agent and a tackifier, the water reducing agent is a polycarboxylic superplasticizer, the tackifier comprises a cellulose polymer or an amide polymer. With the present invention, the damage to the ecology environment due to the natural sand mining is reduced; the damage to the environment due to the iron ore tailings is reduced; the waste can be utilized; a purpose of reutilization of the resource is achieved; with adopting the iron ore tailings, the concrete cost can be substantially reduced, and significant social benefits and economic benefits are provided.
Owner:CHINA MCC17 GRP

Granite powder composite mineral admixture and preparation method therefor

The invention relates to a granite powder composite mineral admixture and a preparation method therefor. The admixture contains raw materials, i.e., modified granite powder, modified pulverized coal ash, slag and a reinforced activator, wherein the mass content of the former three kinds of raw materials is as follows: the mass content of the modified granite powder is 40 to 70 parts, the mass content of the modified pulverized coal ash is 10 to 25 parts, the mass content of the slag is 15 to 35 parts, the sum of mass contents of the three kinds of raw materials is 100 parts, and the mass of the reinforced activator accounts for 0.1% to 0.3% the total mass of the former three kinds of raw materials. The preparation method comprises the steps: proportionally weighing the raw materials, i.e., the modified granite powder, the modified pulverized coal ash, the slag and the reinforced activator, mixing the raw materials, then, putting the mixture into a ball mill, carrying out milling until the screening volume of a square-mesh screen with the pore size of 45 microns is lower than 10%, baking the obtained screen underflow, and carrying out cooling, thereby obtaining the granite powder composite mineral admixture. According to the scheme of the invention, the activity of the granite powder is enhanced, the utilization ratio of the granite powder is increased, and thus the economic and social benefits are very good.
Owner:WUHAN UNIV OF TECH

Heat non-burning cigarette body and manufacturing method thereof

InactiveCN109938398AIncrease heat transfer and smoke effectImprove the smoke effectTobacco treatmentBiochemical engineeringProduction effect
The invention relates to a heat non-burning cigarette body and a manufacturing method thereof, and belongs to the field of heat non-burning cigarettes. The heat non-burning cigarette body comprises anauxiliary unit and a smoke production unit, wherein the auxiliary unit comprises a filter section, a cooling section and a hollow section; one end of the hollow section is connected with the smoke production unit, and the other end of the hollow section is connected with the cooling section; the cooling section is connected with the filter section; the smoke production unit is of a compact hollowtubular structure; the inner diameter of the hollow is 1 to 8 mm; the outer diameter of the column is 5 to 10 mm; the length is 10 to 60 mm. According to the heat non-burning cigarette body and the manufacturing method thereof, a paste smoke production material is made into the compact hollow tubular structure to further enhance the heat transfer and smoke production effect of the smoke production material and increase the suction number and the smoke concentration; furthermore, compared with a smoke production unit such as cut tobaccos and a sheet, the smoke production unit of the heat non-burning cigarette body cannot be covered by cigarette paper, so that a layer of cigarette paper is reduced, and the heat transfer effect between a heating tube and a smoke production material can be further enhanced.
Owner:HONGYUN HONGHE TOBACCO (GRP) CO LTD +1

Pretreatment method for determining multiple heavy metal elements in soil simultaneously

InactiveCN107036876AFast digestionSimplify preprocessing stepsPreparing sample for investigationPretreatment methodDigestion
The invention discloses a pretreatment method for determining multiple heavy metal elements in soil simultaneously. The pretreatment method comprises steps as follows: step (1): sample weighing: the soil is air-dried, ground and screened with a nylon sieve, a soil sample is weighed and put into a microwave digestion tube through a polytetrafluoroethylene long-neck funnel, and the funnel is slightly flapped before the funnel is removed so that all the soil sample attached to the wall of the funnel enter the digestion tube; step (2): digestion: nitric acid, hydrochloric acid and hydrofluoric acid are added to the digestion tube, a cover is screwed down, and the digestion tube is put into a microwave digestion instrument for digestion; step (3): acid driving: after microwave digestion is finished, hydrogen peroxide is added to the digestion tube; then the microwave digestion tube is put into a temperature-controlling acid driver in a fume cupboard for direct acid driving until the volume is smaller than 1 mL, then a solution is directly transferred to a volumetric flask, the volume is constant, and a to-be-tested solution is obtained. With the adoption of the pretreatment method, the digestion speed of the sample can be increased, the pre-treatment step of the sample is simplified, and the accuracy of the detection analysis result is guaranteed.
Owner:PUER COMPREHENSIVE TECHN TESTING CENT

Self-thermal-insulating energy-saving wall body material based on iron tailings powder and preparation method of wall body material

The invention discloses a novel self-thermal insulating energy-saving wall body material mainly made from iron tailings powder, as well as a preparation method of the wall body material, belonging to the technical field of the novel wall body material and building energy saving. The novel iron tailings powder self-thermal-insulating energy-saving wall body material is mainly prepared from the iron tailings powder in the presence of cement serving as a gelatinization material by using a foaming technology, straw cutting, super-light weight aggregate, an interface treatment technology and various admixtures. The wall body material has the beneficial effects that the requirement of saving 65% of energy in severe cold areas is reached without being adhered with a polystyrene board outside, a wall body and the thermal insulating function are formed at one time, effect of no self ignition is achieved, A-grade fire resistance requirement is reached, the inflammable problem of the current high-molecule outer wall thermal-insulating material is solved, and the service life of the wall body material is as long as the service life of a building. A great quantity of iron tailings powder is used for saving energy and utilizing waste and the industrial policy of national building energy saving and wall body innovation is met; and compared with the similar products, the wall body material has remarkable technological and economic advantages, can be widely used in the field of buildings and can generate enormous economic and social benefits.
Owner:肖力光

Method for preparing large-admixture-amount wet-milled phosphorus solid waste super-retarding cementing material

The invention discloses a method for preparing a large-admixture-amount wet-milled phosphorus solid waste super-retarding cementing material. The method comprises the following steps: putting phosphorus slag and desulfurized fly ash into a wet-milling machine, and performing mixing and wet milling so as to obtain mixed slurry A; grinding caustic dross, ardealite and coal ash in a dry-milling machine so as to obtain a mixed powder material B; and mixing the mixed slurry A with the mixed powder material B so as to obtain a mixed material C, adding cement, a water reduction agent, a retarder, tailing sand and macadam into the mixed material C, and performing stirring for 4 minutes, so as to obtain super-retarding concrete. Wastes such as the phosphorus slag, desulfurized fly ash, caustic dross, ardealite, coal ash and tailings are adopted to prepare concrete, wastes are turned into wealth, and the amount of cement can be also reduced; due to a mixed wet-milling mode of the phosphorus slagand the desulfurized fly ash, phosphorus dissolution of the phosphorus slag can be promoted, the initial setting time and the final setting time of the concrete can be greatly prolonged, early-stagehydration heat can be reduced, cracks can be reduced, later strength can be ensured, and large-admixture-amount efficient application of the phosphorus slag can be achieved; and the prepared super-retarding concrete can be applied to large-size concrete, drilling bitten piles, and the like.
Owner:HUBEI UNIV OF TECH
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