42results about How to "Reduce firing heat consumption" patented technology

The invention discloses road silicate cement clinker on the basis of industrial waste residues and a method for preparing the road silicate cement clinker. The road silicate cement clinker comprises nickel slag, calcium carbide residues, zirconium-containing silica residues, bauxite tailing, desulfurization gypsum and mineralizers. The method includes mixing, grinding and homogenizing the nickel slag, the calcium carbide residues, the zirconium-containing silica residues, the bauxite tailing, the desulfurization gypsum and the mineralizers to obtain cement raw materials; preheating the cementraw materials, then calcining the cement raw materials under the condition of the temperature of 1280-1350 DEG C for 30-35 min and then carrying out cooling to obtain the road silicate cement clinker.The road silicate cement clinker and the method have the advantages that the 28 d compressive strength of the road silicate cement clinker can reach 63.9-75.2 MPa, the strength grade of the road silicate cement clinker can reach 62.5 grade, the 28 d breaking strength of the road silicate cement clinker can reach 9.8-18.2 MPa, the 28 d mortar abrasion loss of the road silicate cement clinker is lower than 2.5 kg/m<2>, cement is high in stability, and the road silicate cement clinker is high in abrasion resistance and excellent in work performance; the method is simple, complicated working procedures can be omitted, and the road silicate cement clinker and the method are low in cost.

The invention relates to a method for producing cement clinker through utilization of a stainless steel cold-rolled dehydrated sludge ingredient. The method comprises that: stainless steel cold-rolled dehydrated sludge and other materials of a cement green stock are evenly mixed to prepare the cement green stock; the cement green stock comprises the following compositions in percentage by weight: 70 to 79 percent of limestone, 10 to 14 percent of clay, 1 to 8 percent of the stainless steel cold-rolled dehydrated sludge, 5.3 percent of coal ash, 0 to 3 percent of iron ore powder and 0 to 0.5 percent of gypsum; and the prepared cement green stock is sintered to form silicate cement clinker. The obtained cement clinker and a corresponding cement product have no essential difference with the prior silicate cement clinker and a cement product in composition and performance; the quality of the cement clinker and the corresponding cement product meets the index requirement of national corresponding product standard and can be used as a normal high-quality commodity; and the method effectively utilizes and processes industrial sludge containing harmful metal elements, achieves the effects of resource optimization and utilization and has remarkable environment-friendly benefit.

The invention belongs to the technical field of manufacture of building materials, and relates to a method for preparing foamed ceramic, particularly relating to a method for preparing foamed ceramic with coal gangue as the main material. The method for preparing the foamed ceramic comprises the follow steps: taking 50-70 weight parts of coal gangue, 10-25 weight parts of sandstone, 15-27 weight parts of feldspar, 0-8 weight parts of dolomite and 0.5-3 weight parts of foaming agent; (2) mixing the materials in a ball mill, grinding by adding water according to the mass ratio of the materials to the water of 1:0.5 through a wet grinding method to prepare slurry, and performing mist spraying and granulation of the slurry by controlling the size of the slurry under 60 mum to obtain a powdery material; (3) loading the powdery material into kiln furniture, firing in a kiln at the firing temperature of 1120-1220 DEG C, thermally insulating for 0.5-2.5 hours, and cooling to obtain the foamed ceramic. The foamed ceramic prepared according to the method disclosed by the invention has small volume density, low heat conductivity coefficient, large compressive strength and high fire-protection rating, and can be applied to the fields of external wall insulation of a building.

The invention discloses a method and a device for preparing a nickel iron roasted ore by utilizing a lateritic nickel ore. The method comprises the following steps: firstly, grinding the lateritic nickel ore into an ore powder, then carrying out high-temperature roasting of the obtained ore powder, during the high-temperature roasting process, allowing the ore powder to be in a pre-reduction system and carry out a high-temperature preheating reduction reaction, followed by allowing the high-temperature roasted ore to go into a rotary kiln for high-temperature calcination, thus obtaining a roasted ore containing nickel pig iron after completing high-temperature calcination, and then after dipping the roasted ore into water for cooling, separating to obtain the nickel iron roasted ore. The device comprises a hopper-type elevator, an air chute, a chute draught fan, a rotary feeder, a sluice valve, a rotary kiln, a water-cooling stirring tank, a burner, a hot wind mixing chamber, a high-temperature draught fan, a cyclone dust remover, a bag-type dust remover, a chain-type conveyor, a burner and a pre-reduction system. The preparation method and the device allow the heat transfer area of the ore powder to be large, enable each particle to be uniformly and fully subjected to a chemical reaction, have short reaction time, and have high utilization rate of the lateritic nickel ore.

The invention relates to a multi-product cleaning and producing method comprehensive utilization; coal carbon production, power generation by burning coal gangue, cement production, power generation by cement afterheat and wall material production technology are combined in a same industrial symbiont by using industrial symbiosis; optimal configuration between working procedures is realized; processing procedures of raw materials are converted into processing working procedures capable of separating raw materialsand fuels into different material flows and power flows which have different transport directions; mutually beneficial relationship is established between working procedures; a predetermined downstream working procedure is directly capable of digesting ''pollutant'' of an upstream working procedure; each working procedure utilizes different raw material component and different gradient energy source so as to produce multiple products; so that energy and matter flow in a multi-channel manner; and a little-pollution multi-prduct cleaning and producing technology is formed.

The present invention discloses a method for synergistically treating heavy metal sludge in cement production. The method comprises: (1) carrying out a drying pretreatment on heavy metal sludge so as to make the moisture content be less than or equal to 40 wt%; (2) mixing the obtained heavy metal sludge and a cement raw material to prepare a raw material for cement; and (3) after the raw material for cement is homogenize, firing into a cement clinker. According to the present invention, with the method, the harmless treatment of the sludge and the production of the cement clinker and the product thereof can be simultaneously achieves, such that the heavy metal sludge with characteristics of complex components and difficult recycling is completely digested, and the quality performance of the cement product is not affected.

A disclosed method for producing cement clinker by employing phosphorus slag comprises the following steps: (a) crushing rough materials, namely, crushing the rough materials mainly composed of limestone, phosphorus slag, shale, sandstone and iron ore, so as to respectively obtain limestone particle, phosphorus slag particle, shale particle, sandstone particle and iron ore particle; (b) pre-homogenizing the rough materials, namely, performing layered stacking on the various particles obtained in the step (a); (c) preparing raw material; (d) homogenizing the raw material; (e) preheating and decomposing; (f) sintering and obtaining clinker; and (g) grinding the clinker, namely, cooling the sintered clinker, and grinding the clinker to obtain a needed granularity, so as to finish cement production. The method helps to improve the sintering easiness of the raw material, improve the clinker quality, improve the kiln decomposition rate, improve rotary kiln operation ratio, reduce clinker sintering heat consumption and cement comprehensive electricity consumption, increase clinker output, and substantially reduce cement production cost.

The invention discloses a method for preparing cement from manganese iron slag, which comprises the following steps: (a) raw material crushing: crushing the raw materials mainly composed of limestone, manganese iron slag, shale, sandstone and iron ore to respectively obtain limestone particles, manganese iron slag particles, shale particles, sandstone particles and iron ore particles; (b) raw material prehomogenization: carrying out stratified piling on various particles obtained in the step (a); (c) green material preparation; (d) green material homogenization; (e) preheating and decomposition; (f) clinker firing; and (g) clinker milling: cooling the fired clinker, and milling the clinker to the required particle size, thereby completing the cement production. The method can improve the sinterability of the green material, improve the clinker quality, enhance the in-kiln decomposition rate, increase the operation rate of the rotary kiln, lower the clinker firing heat loss and cement comprehensive power consumption, enhance the cement yield and greatly lower the cement production cost.

The invention discloses a multiphase dynamic catalytic oxidation combustion method of novel dry-process rotary kiln pulverized coal. Nanoscale molecular multiplex catalyst precursor and the like are continuously added into kiln head pulverized coal in a liquid state mode; multiphase dynamic high-temperature flame catalytic oxidation combustion is carried out in the kiln; parts of nanoscale functional metallic oxide catalyst formed by the high-temperature flame section enter the coal, material and wind suspension system in the decomposing furnace by pulling wind; and catalytic oxidation combustion is carried out again. The waste functional metal ion oxide serves as high-efficiency ion-type sintering aid in the kiln to accelerate C3S in the cement clinker to be generated and lower fCaO, thus realizing stable production, high yield and good quality. The invention burns two bundles of fire of a novel dry-process kiln, effectively lowers clinker sintering thermal loss, improves clinker quality and kiln yield, reduces the discharge value of CO2 and CO and has obvious effect on energy saving, emission reduction and cost reduction.

The invention relates to a preparation method of the phosphorus residue portland clinker. The clinker is includes limestone, pyrite residue, river sand, phosphorus reside and gangue raw material. It is formed by the following steps that the raw material is mixed in proportion, used pulverizing together and fired by the pre-decomposition kiln system at the condition of new type dry method cement system. The weight mixing proportion of the raw material orderly is from seventy to eighty five, from five to seven, from one point five to three, from eight to fifteen, and from zero point five to five. The invention can use the industry waste that phosphorus reside, pyrite residue and gangue as the raw material to prepare the low temperature loading type portland clinker. So it can solve the shortage of the fat limestone, clay, and iron ore, as well as supply a perfect approach for industry waste processing. Moreover, it can save the resource and energy source, reduce the pollution discharging, and is good for reducing cost, protecting environment, and increasing output and quality of the clinker, so that it is easy to popularly use in the new type dry method cement plant.

The invention relates to a cooling bleaching production technique of white silicate cement clinker, comprising the following steps: discharging calcined high-temperature white silicate cement clinkerfrom a kiln, conveying the clinker into an air heat exchanger for 5-500 seconds of bleaching by wind cooling; delivering the hot air that conducts heat exchange with the high-temperature clinker intoa clinker calcining kiln so as to be used as secondary combustion air; and transferring the clinker bleached by the air heat exchanger into a normal spray-type or soak-type cooling bleaching machine for spray-type or soak-type cooling bleaching until the clinker is cooled down to the temperature of 20-100 DEG C. Compared with the existing production technique, the white silicate cement clinker isbeneficial to decreasing the heat consumption for calcining the clinker, and promoting the sufficient combustion of fuels, thus improving the calcining yield of the kiln; besides, two times of coolingbleaching with different media is beneficial to improving the quality of the white cement clinker.

The invention relates to the technical field of cement production. A purpose of the present invention is to replace or reduce the clinker consumption for cement production by using ultrafine fly ash so as to reduce the production cost of enterprises. The invention relates to ultrafine fly ash and a preparation method thereof, wherein the ultrafine fly ash comprises the following raw materials by weight: 40-50% of dry fly ash, 20-30% of steel residue, 1.5-3% of lime, 0.8-1.5% of a defoamer, 15-25% of waste sand, 3-5% of waste gypsum, and 5-8% of slag. According to the present invention, the ultrafine fly ash is prepared through breaking, magnetic separation, mixing, grinding, dehydration and other processes; and the method has advantages of simple and practical operation, effectively reduced cement clinker consumption, reduced heat consumption of clinker firing, production cost reducing, cement quality stabilizing, dry shrinkage rate improving, cement solidification rate enhancing, cement strength enhancing and the like, and is conducive to the promotion and application of energy saving and emission reduction.

The invention discloses a high-efficiency process for co-processing shellfish wastes with a cement clinker production line. The process comprises the steps: placing collected shells in a piling shed, rinsing cleanly with water, sending the air-dried shells to a dryer, introducing dedusted hot wind of a kiln tail of a rotary kiln in the cement clinker production line into the dryer, drying the shells, directly discharging emptily deodorization-treated tail gas discharged by the dryer, sending the dried shells into a crusher, crushing, sending the crushed shell broken material as a cement clinker raw material to the cement clinker production line for producing cement clinker or being directly used as a cement raw material. Not only is the shellfish waste utilized, but also energy sources are saved. The invention also discloses a system suitable for the process.

The invention relates to a shaft kiln slurry pelleting machine. Wherein, there is stuff device (4) connected to the mother mould (5) under the hopper (2); the mother mould (50 is connected to mould discharger (3), mould repair ring (60, mould release block (9) above the vibration screen (8); the mother mould (5) is mounted with ball mould bottom pin; the speed reducer (11) via bearing is connected to the mother mould (5), mould discharger (3), and mould repair ring (6). The invention has the advantages that: it has low water content as 6-8%; it has uniform particles; and it has low energy consumption. The invention can improve 20% yield and 5-8MPa strength.

The invention discloses a high-activity MgO roasting technology and device. The roasting technology comprises the following steps: firstly, enabling magnesium carbonate powder and hot air to be in contact and mixed to absorb heat, and pre-heating the material until the temperature is about 350 DEG C; then carrying out cyclone calcination and calcining and decomposing in a temperature range of 800DEG C to 1000 DEG C to obtain an MgO and CO2 mixture; conveying the cooled MgO and CO2 mixture into a separation device and carrying out gas-material separation; conveying collected powder into a finished-product cabin and storing; after treating escaped waste gas through a water gas treatment device, discharging the waste gas into the atmosphere through a chimney. According to the high-activity MgO roasting technology and device, disclosed by the invention, the disadvantages of an existing high-activity MgO calcination device of large equipment investment, short running period, large repairing strength, high heat consumption and great product quality fluctuation are changed and the High-activity MgO roasting technology and the special device thereof are developed; the device has the advantages of less investment, simple equipment, long service life, low repairing difficulty, low firing heat consumption and good product activity stability.

The invention discloses a composite silicate cement. Wherein, doping the mineralizer of more than 12wt% slag contained the phosphoric slag, zinc slag, hearth slag, and sulfuric slag into the raw material comprised ore, clay and coal to crush and grind to obtain the material with 0.98+/-0.02 KH, 2.4+/-0.1 N and 1.4+/-0.1 P; adding the mixed material of more than 30wt% contained phosphoric slag, coal ash, ardealite and lithium slag into the calcining grog; then, homogenizing, crushing, grinding, and obtaining the product. The product has high early strength, fast growth of later strength, and all physicochemical index super to the GB12958-1999 standard. This invention improves the combustibility of raw material effectively, reduces heat consumption and fCaO content of grog, and saves material and energy.

The invention relates to the field of cement building material production technology application. A purpose of the invention is mainly to reduce the production cost of enterprises by replacing or reducing clinker consumption for cement production with steel residue composite powder. The invention discloses steel residue composite powder and a preparation method thereof, wherein the steel residue composite powder comprises the following raw materials by weight: 36-42% of steel residue, 4-6% of gypsum, 12-18% of fly ash, 3-6% of silica fume, 2-4% of pumice, 5-8% of clay, 12-17% of quartz sand, 10-15% of coal gangue, 2-4% of a surface enhancer, 1.5-2.5% of a grinding aid and 2-4% of an aqueous defoaming agent. The preparation method comprises: crushing, aging, primary magnetic separation, secondary magnetic separation, mixing, grinding and dehydration. According to the invention, through the technological innovation, waste raw materials such as steel residue, fly ash and the like are utilized to improve the technological formula, so that the waste resources and the like are fully utilized, and the purpose of changing of waste into treasure is achieved; the method is simple and practical in operation, and can effectively reduce the clinker sintering heat consumption, improve the dry shrinkage rate of the cement clinker, enhance the curing rate and the compressive strength of the cement clinker, prolong the service life of cement and ensure the construction quality.

The invention relates to a silicate cement production method, and specifically relates to a method of using industrial solid slag to produce silicate cement for nuclear power engineering. The silicate cement comprises the following raw materials in percentage by weight: 72.0 to 78.0% of limestone mining waste, 7.0 to 16.0% of silica mining waste, 1.0 to 5.5% of blast furnace granulated slag, and 8.0 to 12.0% of tailings of iron ore mining. The abovementioned raw materials are mixed and milled and then the powder is subjected to heat change in a pre-heater, a gas-solid separation treatment, carbonate decomposition in a decomposing furnace, calcining in a dry-process rotary kiln, and cooling so as to obtain silicate cement clinker. According to the method, limestone mining waste, silica mining waste, blast furnace granulated slag, and tailings of iron ore mining are taken as the raw materials to produce silicate cement that is qualified for nuclear power engineering, a large amount of natural raw materials is saved, the energy consumption is reduced, the cost is saved, and the ecological environment is protected.