12210 results about "Blast furnace" patented technology

The invention describes an activated supersulphated aluminosilicate binder containing aluminosilicates, calcium sulphate and an activator containing alkali metal salts, wherein the aluminosilicates are selected from the group consisting of blast furnace slag, clay, marl and industrial by-products such as fly ash with the proviso that the Al2O3 content is greater than 5% by weight, wherein blast furnace slag is present in an amount exceeding 35% by weight and clay, marl and/or fly ash is present in an amount exceeding 5% per weight and wherein cement kiln dust in an amount of from 3 to 10% by weight is added to the mixture as an activator and calcium sulphate is used in an amount exceeding 5% by weight.

A thermally conductive cement-sand grout for use with a geothermal heat pump system. The cement sand grout contains cement, silica sand, a superplasticizer, water and optionally bentonite. The present invention also includes a method of filling boreholes used for geothermal heat pump systems with the thermally conductive cement-sand grout. The cement-sand grout has improved thermal conductivity over neat cement and bentonite grouts, which allows shallower bore holes to be used to provide an equivalent heat transfer capacity. In addition, the cement-sand grouts of the present invention also provide improved bond strengths and decreased permeabilities. The cement-sand grouts can also contain blast furnace slag, fly ash, a thermoplastic air entraining agent, latex, a shrinkage reducing admixture, calcium oxide and combinations thereof.

A heating furnace for calcining an object to be heated. The heating furnace includes a wall defining a furnace space and configured to receive the object in the furnace space, and a heating device configured to raise a temperature within the furnace space. The heating furnace also includes an oxygen supply channel configured to introduce gases containing oxygen into the furnace space. The oxygen supply channel is formed as an opening in a part of the wall surrounding the furnace space. The heating furnace further includes a gas discharge channel fluidly connected to the furnace space and configured to discharge gases in the furnace space to an outside of the furnace space, and a measurement device installed in the gas discharge channel and configured to measure properties of the gases passing through the gas discharge channel.

A net is made from an explosive resistant material such as KEVLAR and is thrown over an explosive-laden device such that the net helps contain the blast force of the explosive-laden device. The net also has a nozzle that is fluid connected to a fire suppressant agent as well as a high density foam, each of which are discharged through the nozzle once the net is thrown over the explosive-laden device, the fire suppressant agent and the high density foam each helping to minimize the blast force of the explosive-laden device. The net can be thrown manually or can be fired from a gun that uses either pneumatic force or a firing cartridge to propel the net at its target.

The invention discloses a refractory spray coating with high steel fiber content and a spraying method thereof, which belong to the technical field of refractory materials. The method comprises the following step of: 1, pneumatically conveying the refractory spray coating to a nozzle, adding water onto the nozzle, and spraying and bonding the coating on a wall; or 2, adding water or a liquid bonding agent into the refractory spray coating, stirring the mixture into mortar, conveying the mortar to the nozzle by a pumping method, spraying the mortar out of the nozzle by using high-pressure air,and bonding the mortar on the wall. The refractory spray coating comprises the following ingredients in part by weight: 30 to 80 parts of refractory aggregate, 30 to 50 parts of refractory powder, 5 to 20 parts of bonding agent, 0.5 to 15 parts of additive and 3 to 80 parts of steel fiber. The invention has the advantages that: by spraying the refractory spray coating on a blast furnace cooling wall, spraying on a blast furnace throat steel brick, spraying on various refractory linings with cold faces and hot faces and repairing, the service life of the refractory material for the inner wall of a blast furnace can be greatly prolonged, and the effects of protecting the environment, saving energy and reducing consumption are achieved.

The invention relates to a fiber concrete material belonging to the field of building materials. The fiber concrete material mainly contains cement, active mineral blending materials, aggregates, fibers and water and is characterized in that the active mineral blending materials adopt coal ash, siliceous dust, pelletization blast furnace slag and metakaolin; the fibers adopt polyvinyl alcohol fibers, polyethylene fibers and aromatic polyamide fibers; the maximum particle size of the aggregates is smaller than or equal to 0.5mm, and the ratio of the weight of the aggregates to the total weightof the cement and the active mineral blending materials is 1-70 percent; and the blending volume of the fibers accounts for 1.5-2.5 percent of the total volume of fiber concrete. The fiber concrete material has the advantages of high tenacity, higher deformation capability, tensile strength and bending strength, limit tension strain of 1.8-7.5 percent, tensile strength of 4-10MPa and bending strength of 10-20MPa, can control the width of a crack lower than 0.1mm, effectively enhance the integrity and the shock resistance of a structure and ensure the permeability resistance and the durabilityof the structure.

The invention relates iron melt improving vanadium content and controlling calcium content cooling agent and the technology, specially relates the cooling agent of adjusting the proportion of cooling agent to stabilize calcium content in vanadium slag and the technology. The technology comprises the 56-60wt% iron scale, 30-40wt% iron concentrate powder containing vanadium, and 5-10wt% anchoring agent. The method stabilizes the calcium content and iron content in vanadium slag, and effectively solves the problems of great fluctuation of vanadium slag composition and superstandard calcium and iron. By controlling the thermoregulation material to meet the requirements of the improving vanadium temperature and calcium oxide content, the method improves the vanadium slag grade and extraction rate. The invention possesses the following characteristics: 1 shortening the converting time; 2 improving the vanadium slag grade and extraction rate, and stabilizing the calcium oxide content; 3 reducing the iron loss.

The invention provides a metallurgical composite pelletizing prepared through a twice pelletizing method, as well as a preparation method and an application thereof. The pelletizing is provided with a pelletizing shell formed by a central pelletizing core and a pellet material coating the outside of the pelletizing core. The internal pelletizing core of the formed pelletizing is in a reducing atmosphere, the outside of the formed pelletizing is in an oxidizing atmosphere, and the metallurgical composite pelletizing undergoing twice pelletizing satisfies the metallurgical requirements. The pelletizing core takes an iron-containing material and reducing coal dust or coke powder as raw materials in which adhesive and waste fly dust are added, and is obtained by means of disk pelletization or pressure pelletization. The pelletizing shell takes the iron-containing material and the pelletizing core as raw materials in which the adhesive is added, and is obtained by means of disk pelletization and taking the pelletizing core as the center of the sphere. Various metallurgical performance indexes of the composite pelletizing are highly better than normal pellets. The composite pelletizing not only realizes the harmlessness and the recycling of the waste fly ash, but also can greatly improve the technical and economic indexes of iron making blast furnaces. In addition, the composite pelletizing not only achieves such social benefits as energy conservation, emission reduction, environment protection and environment pollution treatment, but also can create considerable economic benefits.

The invention discloses a method used for the preparation of microcrystalline glass by use of blast furnace slag, wherein blast furnace slag is crushed and sifted out and then is mixed with 0 to 10 wt percent of feldspar and 0 to 5 wt percent of zirconite to make mixed powder material with the weight proportion of blast furnace slag no less than 85 percent; then, the mixed powder material is made into slurry through ball milling mixing and agglomerant is added in after the slurry is dried to complete granulation; and finally, microcrystalline glass is made through direct tabletting crystallizing sintering. The method has the advantages that: (1) ironmaking blast furnace slag is adopted as main material with the addition amount of the blast furnace slag reaching more than 85 percent, which not only saves resources and reduces pollution, but also realizes cycle economy; (2) cheap silicate materials including zirconite and feldspar are adopted as additives; (3) powder tabletting sintering method is adopted to make microcrystalline glass, thereby omitting the complex process of casting moulding after high-temperature fusion of glass or sintering after fusion water quench in the prior glass process and sintering process.

The invention provides a geopolymer gel material for rush repairs and rush constructions, which is prepared by adding water to 13-17 percent by weight of exciting agent and 82-87 percent by weight of slag containing aluminosilicate. The slag comprises one or the combination of more of blast furnace slag, steel slag, coal ash and coal gangue, and the exciting agent comprises the following components in percentage by weight: 35-75 percent of SiO2, 0-55 percent of Na2O, 0-65 percent of K2O, 0-1 percent of CaO and 0-1 percent of SO3. The geopolymer gel material which has the characteristic of quick setting and hardening is prepared by using the industrial waste slag as a main raw material and matching the exciting agent, and the geopolymer gel material has excellent mechanical property and controllable setting time and can replace gel materials such as fast setting and hardening cement, and the like in the processes of rush repairs and rush constructions. The industrial solid wastes such as the blast furnace slag, the steel slag, the coal ash, the coal gangue, and the like containing the aluminosilicate series are used as main raw materials, metakaolin is not added and the raw materials do not need to be calcined, thus the invention has low energy consumption, less pollution, simple process, low cost, environmental protection and energy saving.

The invention relates to a blast furnace slag heat recycle system and relative production, wherein it is formed by cooling-breaking, gas-slag heat exchanger, and left-heat boiler units; the slag outlet has cooling-braking unit which will cool the slag to the solidify point 1200-1300Deg. C, to be broken into the slag particles whose diameter is less than 100mm; the transmitter is connected to the gas-slag heat exchanger to heat the air to 700-800Deg. C; the slag will be cooled under 150Deg. C; the heated air will be transmitted to the left-heat boiler; the water of heating tube of boiler will adsorb the heat of gas, to generate the steam whose pressure at 0.3-0.4MPa and temperature at 260-350Deg. C. The invention can improve the energy recycle efficiency more than 70%, to reduce the energy consumption of steel production, reduce the consumption of cooling water, and reduce the environment pollution.

The present invention is one kind of coke coal blending ratio and coking process. The coke coal consists of fat coal 20-23 weight portions, coking coal 50-55 weight portions, 1/3 coking coal 15-20 weight portions, and lean coal 8-12 weight portions. The compounded coal has the quality including ash content 9-10 %, sulfur content 0.65-0.73 %, volatile component 24-26 %, G value 83-88, Ymm of 16-20, and Xmm of 20-30. The quality parameters, vitrinite reflectances and microscopic ingredients of the said four kinds of coal are specifically defined. During the coking process, the mixed coal material is sintered at 1200 deg.c for not less than 16 hr. The present invention can obtain coke with high strength.

The invention provides a method for producing baking-free bricks by using phosphorous gypsum based cementitious material to solidify yellow phosphorous slags. 1) The raw materials and formula of the invention are as follows: (1) the phosphorous gypsum cementitious material: 40-60 parts of phosphorous gypsum, 0-30 parts of yellow phosphorous slags, 0-30 parts of pulverized fuel ash, 0-5 parts of blast furnace slag, 10-15 parts of calcined lime, and 0-10 parts of carbide slag; (2) the mateirals of the baking-free brick green bodies: 100 parts of phosphorous gypsum cementitious material, 150-300parts of yellow phosphorous slags raw materials, 2-4 parts of activator, 0.2-1 part of auxiliary agent, and 10-40 parts of water. 2) The preparation method: the baking-free bricks are produced throughthe steps of treating raw materials, mixing the solution with additive, preparing brick blanks and moulding and conserving. In the production process of the invention, no organic matter is added, thus completely avoiding the pollution problems of toxic substance caused by degradation of organic materials, and the release of additive and volatilization of residues, and having the advantages of lowcost, good physical property, high production efficiency, saving of energy consumption and non environmental pollution.

The invention discloses a strength determination method for reacted blast furnace coke, which comprises the following steps of: (1) placing a coke sample in a reactor; (2) putting the reactor in an electric heating furnace; (3) inserting a temperature thermocouple into the coke in the reactor;(4) putting an electronic balance on a lifting table and connecting the electronic balance and the reactor through a chain; (5) regulating the electric furnace to heat through a temperature controller and introducing nitrogen when the temperature in the center of a material layer reaches 400 DEG C; (6) introducing carbon dioxide gas when the temperature in the center of the material layer reaches 780 DEG C; (7) cutting the nitrogen and introducing prepared mixed gas when the temperature in the centerof the material layer reaches a certain value, maintaining the temperature of the heating furnace, and when the loss ratio of the coke samples reaches the required value continuously introducing the carbon dioxide gas or the mixed gas, introducing the nitrogen and cooling after the carbon dioxide gas or the mixed gas reaches the specified dissolve loss quantity; and (8) stopping introducing the nitrogen and cooling naturally when below 100 DEG C. The invention more truly reflects the actual conditions of the coke in a blast furnace, and the prediction of the thermal properties of the coke is more accurate.

The invention relates to the field of energy recovery utilization and in particular to a molten blast furnace slag sensible heat recovery method and a device; the method is characterized in that: themolten blast furnace slag carries out a first heat recovery in a granulator, and then a second heat recovery is carried out by a vibrated bed, and then a third heat recovery is carried out in a fluidized bed, and the reclaimed heat energy is reutilized or converted in a hot air or power generating way; the realization steps are that: 1) the molten blast furnace slag is arranged in the granulator for granulation; 2) the blast furnace slag granules carry out heat exchange in the vibrated bed; 3) the blast furnace slag granules carry out heat exchange in the fluidized bed; 4) after heat exchangeis carried out, the heat is used for power generation from air or is directly utilized in a hot wind way. The method has the beneficial effects that: the sensible heat of the molten blast furnace slagis utilized respectively in a way of waste heat stream power generation and in a way of blast furnace hot wind, compared with the existing water quenching method, 1.0-1.2t of fresh water can be savedwhen processing 1t of molten slag, and sulfides H2S and SO2 are not produced, and energy equivalent to 47kg of standard coal is saved.

The invention relates to a high-performance sand-soil consolidation material, as well as a preparation method and a using method thereof. The high-performance sand-soil consolidation material belongs to a mortar composition and is characterized by comprising the following raw materials in parts by weight: 5-40 parts of cement clinker, 3-6 parts of gypsum, 4-10 parts of alkali additive, 0.5-6 parts of compound activating agent, 1-4 parts of early strength agent, 2-10 parts of mineral activating agent, 3-8 parts of expansion agent and 22-77 parts of micro-powder formed by fine grinding of blast furnace water-quenched slag. The invention provides the high-performance sand-soil consolidation material which has the advantages of simple operation, convenient construction, good water resistance, fast consolidation, high early strength, stable improvement of post-strength, resistance to erosion of underground inorganic salt water, excellent anti-seepage performance and low production cost, as well as the preparation method and the using method thereof. The high-performance sand-soil consolidation material is suitable for consolidating mine tailings, natural weathered sand, fly ash, gravel, stone chips, stone powder, soil, sludge, construction waste, coal gangue and phosphorus slag into a solid material, and can be used for laying a subgrade, constructing a wall body and constructing a site foundation.

The invention relates to a technique method for directly producing sponge iron by carrying out deep reduction on extracted vanadium tailings, belonging to the field of iron making. The method adopts brown coal as the reducing agent, and simultaneously CaO is added as slag former and used for increasing alkalinity to synergize with Na2O and K2O in the tailings to react with SiO2 and Al2O3 to generate zeolite-like stable mineral so as to boost extraction and separation of sponge iron in products of deep reduction. The products of deep reduction are subject to two-section ore grinding-two-section low intensity magnetic separation technique to obtain sponge iron with iron grade larger than 90% and TiO2 smaller than 0.20%. The invention is simple in technique and easy to control, and has large reserves of raw materials and low price; the product can be used as raw material for steel making; other impurities meet steel making requirements, the technique flow of processing iron ore into rolled steel is shortened, the environment pollution caused by sintering, pelletizing and blast furnace iron making of iron ore concentrate obtained by other methods can be avoided, and the invention has obvious environment benefit and energy conservation and consumption reduction effects.

A fire-proof pouring material for blast-furnace iron tap channel and its production are disclosed. The pouring material consists of industrial schmigel, SiC fines, high-temperature asphalt superfine powder, alumina or calcium aluminate cement, a-Al2O3 superfine powder, SiO2 superfine micro-powder and metal silicon. The process is carried out by taking sodium tripolyphosphate or calgon or aluminum powder as additives, adding into aluminous fly ash, agitating, mixing, obtaining the pouring material, adding into 3-7% water, agitating, mixing, adding into mould, vibrating for vibrating bar or plate, naturally hardening and drying, demoulding, drying at 80-700 Deg C., heat treating and removing moisture. It costs low and has good availability.

In one example of an embodiment of the invention, a method for producing an aggregate is disclosed comprising mixing sewage sludge from a waste water treatment facility with a non-coal combustion ash silicoaluminous waste material, agglomerating the mixture to form an agglomerate, and pyroprocessing the agglomerate to form an aggregate. The waste material may comprise municipal solid waste incinerator bottom ash, incinerator fly ash, incinerator filter dusts, cement kiln dusts, waste glass, blast furnace slag, kiln dusts, and/or granite sawing residues, for example. The method may further comprise milling the waste material prior to mixing. Preferably, the milling is wet milling. Pyroprocessing of the agglomerate may take place in a rotary kiln. The resulting aggregate may be a lightweight or a normal weight, sintered or vitrified aggregate. Aggregates and methods for making aggregates of high and low calcium silicoaluminous materials are also disclosed.