114results about How to "Improve burnability" patented technology

A fuel which is used for rotary kiln cement clinker firing is composed of raw materials with the following weight percentage: coal 3-80, straw substances 0-90, forest products wastes 0-95 and food industry by-product residues 0-70. The straw substances refer to rice straws, wheat straws, cotton stalks, sesame stalks, soybean straws, corn stalks, sorghum stalks, rice husks, peanut shells, soybean shells and corn sticks, the forest products wastes refer to defective bamboo, wood, tree branches, leaves, shrubs, faggot straws and sawdust and wood wool corner scrap materials in the bamboo and wood-processing industry, the food industry by-product residues refer to bran, wheat skin, squeezing meal cake, bean dregs and wine lees, and the coal refers to bituminite, anthracite and coke coal powder. The flue raw materials which are used for the rotary kiln cement clinker firing have wide selecting range, simple preparation, convenient use and rapid burning speed and are beneficial for protecting atmosphere circumstances.

The invention relates to a method for producing Portland cement clinker with incineration slag of municipal solid waste. The method solves the problem of crust and blockage caused by chlorine through the reconstruction of the prior kiln which is realized by mounting a by-way air exhaust device. For a kiln system with a kiln row and a furnace row which are independent from each other, the by-way air exhaust device is arranged in an uptake of a kiln end gas chamber in the kiln row close to a five-stage cylinder; while for common industrial kiln, the air exhaust device is arranged between an outlet of decomposing furnace and an inlet of the five-stage cylinder or arranged at an uptake of an outlet of the five-stage cylinder; the fly ash passes through a kiln head, the kiln end gas chamber, or the decomposing furnace and then is sprayed into the kiln. The use frequency of the by-way air exhaust device is between once per four hours and once per three days, the temperature of the air entering the by-way air exhaust device is controlled to be more than 950 DEG C. the method has the advantages of small reconstruction investment, low treatment cost, production of Portland cement clinker having wide application range and meeting JC/T853-1999 standards of Portland Cement Clinker, realization of reclamation, contribution to the development of cyclic economy, and reduction in consumption of natural resources and energy of the cement industry.

The invention discloses a method for preparing cement clinker by using oil shale waste residues. The method comprises the following steps of: 1, mixing the following components according to the following proportions: 81 to 84 percent of limestone, 12 to 15 percent of shale waste residues, 1 to 2 percent of iron tailings sand and 2 to 4 percent of moulding sand; and 2, grinding the mixture obtained in the step 1 to obtain raw materials which is screened by a 80um square-hole sieve of which the screen residue is less than 5 percent, calcining the raw materials at temperature of between 1,350 and 1,450 DEG C for 15 to 20 minutes, and cooling to obtain the cement clinker. The method is used for preparing the cement clinker by using the oil shale waste residues replacing clay, so that a large quantity of clay resources are saved, and the production cost of the cement is reduced; furthermore, the doped quantity of the oil shale waste residues is large and up to 13 percent, so that the oil shale waste residues are used fully; therefore, the economic benefit is increased, wastes are turned into treasures, a large quantity of stacked residues are avoided, the land occupied amount is reduced, and the environment pollution is reduced.

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 relates to a high-activity crystal seed for concrete production and a preparation method thereof. The crystal seed is prepared by microwave strengthened calcination of the following components in percentage by weight: 70-90 percent of waste ceramic powder, 10-30 percent of pregrinded carbide slag powder and 2-5 percent of modified additive. The preparation method comprises the steps of: taking the components and mixing and grinding according to the proportion, and adding the modified additive in the mixing and grinding process; mixing and grinding until the Brinell specific surface area is 350-400m<2>/kg, homogenizing and placing into an electric heating furnace; and after heating to 800-1,000 DEG C, immediately transferring to a microwave oven with power 600-800W, heating for 90-120 seconds by microwaves and then grinding to 400-450m<2>/kg by adopting vibration grinding. The crystal seed can rapidly promote early hydration of a cement and mineral mixture, obvious improves the early strength of concrete, has good transitive ductility of later strength, no adverse effect on durability and obvious technical, economic and social environmental protection benefit and resource and energy saving.

The invention discloses a cement clinker and belongs to the technical field of cement clinker production. The clinker is prepared from the following raw materials in percentage by mass: 30 to 60 percent of calcareous materials, 0 to 25 percent of siliceous materials, 10 to 40 percent of aluminum materials, 0 to 10 percent of ferrous materials and 5 to 20 percent of gypsum materials; a mineral composition of the clinker is prepared from 10 to 40 percent of C4AS, 25 to 40 percent of C2S and 10 to 30 percent of C4AF. According to the clinker disclosed by the invention, the iron content of the cement clinker is low, and the seawater erosion resisting ability of the clinker is improved; the cement clinker is especially suitable for marine engineering.

The invention discloses a method for producing a belite-gypsum material by using sludge and waste gypsum through a dry-process rotary kiln. The method comprises the following steps of (1) melting a sludge ridge grain seed crystal with high water content into modified sludge residues; (2) proportioning raw materials of the modified sludge residues, the waste gypsum and a correcting material according to a certain ratio, and grinding the raw materials by using a vertical mill to form raw material powder; (3) delivering the raw material powder obtained in the step (2) into a dry-process rotary kiln system, and calcining the raw material powder to form clinker; and (4) grinding the obtained clinker to obtain powder with the fineness of 0.08mm and the screen residue content of less than 20%. The method disclosed by the invention is simple, low in investment and cost, free of other secondary pollution and capable of absorbing the sludge and the waste gypsum on a large scale and in a recycling way, greatly reducing the energy consumption and relieving the environment pollution.

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 relates to a method for producing high-strength clinker from high-magnesium limestone. The method uses the following raw materials in parts by weight: 50-70 g of sulfuric acid slag, 80-200 g of high-magnesium limestone, 600-760 g of low-magnesium limestone, 20-40 g of shale, 20-40 g of sandstone and 20-30 g of coal gangue, summing to 1000 g. According to the invention, the high-magnesium limestone is adopted to replace part of low-magnesium high-calcium high-quality limestone, the coal gangue is added, and the values of the three rates of the clinker are reformulated. Compared with the composition of traditional silicate clinker, the invention has the following advantages: the high-magnesium limestone and the coal gangue are used as substitute materials, so a clinker firing temperature is easily reduced, the burnability of the clinker is improved, and the energy consumption of the clinker is reduced; and since high-magnesium limestone resources and waste coal gangue of amine are effectively utilized, resource problems and environmental pollution problems are solved, a way is found for improving the ecological environment, and high social benefits and environmental benefits are achieved.

The steel slag cement clinker is produce with limestone 475-525 (in weight portions, the same below), flyash 160-180, reducing slag 200-240, steel slag 60-100 and sandstone 20-40 and through mixing, milling and baking in rotary kiln. The present invention used flyash to replace clay, reducing slag replacing partial limestone and steel slag replacing iron ore, and this can save resource, protect ecological environment and reduce CO2 exhaust while raising yield, lowering power consumption and saving fuel.

The method for preparing cement clinker by using chromium slag as mineralizer is mainly in the cement raw material the mineralizer chromium slag can be added, and the high-temp. calcination process is adopted to reduce hexavalent chromium into trivalent chromium, at the same time a catalytic stabilizer can be added in the clinker so as to obtain the invented cement clinker.

The invention discloses a cement clinker preparation method using converter steel slag to correct iron quality. The preparation method comprises the following steps: 1) gradient grinding and magnetic separation; 2) mixing and grinding: a step of fully and uniformly mixing and grinding more than 0 wt% but no more than 5.4 wt% of converter steel slag with a cement raw material; and 3) calcining at a temperature of 1380 to 1400 DEG C so as to prepare the cement clinker. Directed at the characteristic that iron particles and difficult-to-grind phases like an RO phase in the converter steel slag are in the state of enrichment, the method provided by the invention carries out two-stage gradient grinding and sorts out iron particles and difficult-to-grind phases like the RO phase enriched in the converter steel slag by using a strong magnetic field, then the converter steel slag and the cement raw material are mixed, ground and calcined so as to prepare the cement clinker, so grinding efficiency of the cement raw material is improved, the service life of grinding equipment is prolonged, the converter steel slag is finer, the effect of seed induction of the converter steel slag is given to full play in the process of calcining of the cement clinker, the calcining temperature of cement is decreased by more than 50 DEG C, and the refined converter steel slag can adjust the aluminum rate (IM) in the cement raw material and functions as a mineralizer and a promoter.

The invention provides a segment treatment method for fluorine-containing heavy metal wastewater. The method comprises the specific steps: after chemical reduction treatment of wastewater, adding a pre-neutralizing agent into a front segment settling tank to allow complexing precipitation of metal ions in the wastewater to occur, and carrying out concentration and plate-frame pressure filtration on sludge to obtain front segment sludge; feeding a supernate into a rear segment settling tank, then adding a post-neutralizing agent, discharging the supernate which meets the standard, allowing complexing precipitation of Ca<2+>, F<->, SO4<2-> and the like in the wastewater to occur, carrying out concentration and plate-frame pressure filtration on sludge to obtain rear segment sludge, and drying and smashing the sludge to obtain a cement mineralizer; and uniformly mixing the cement mineralizer with limestones, clay, a correcting material and the like, and grinding and calcining the mixture according to a conventional cement production and processing process to obtain cement clinker. The method provided by the invention not only realizes resource utilization of stainless steel cold-rolled sludge which can effectively replace natural gypsum and fluorite, thereby better satisfying the demand of low-temperature sintering, high quality and high yield, energy saving and consumption reduction of the cement clinker.

The invention discloses a method for producing a belite-gypsum material by calcining sludge and waste gypsum through a vertical kiln. The method comprises the following steps of (1) melting a sludge ridge grain seed crystal with high water content into modified sludge residues; (2) carrying out two-stage proportioning on raw materials of the modified sludge residues, the waste gypsum and a correcting material according to a certain ratio, homogenizing, adding a proper proportion of fire coal in the proportioning and homogenizing processes, and molding grains or charging bars to obtain a black raw material molding material; (3) delivering the obtained black raw material molding material into the vertical kiln, and calcining the black raw material molding material at the temperature of 1250-1400 DEG C to form clinker; and (4) grinding the obtained clinker to obtain powder. The method disclosed by the invention is simple, low in investment and cost, free of other secondary pollution and capable of absorbing the sludge and the waste gypsum on a large scale and in a recycling way, greatly reducing the energy consumption and relieving the environment pollution.

The invention belongs to the technical field of building materials, and provides silicate clinker and cement prepared with the same to overcome the defects of high raw material cost, poor burnability of raw batch, low long-term strength of clinker, difficulty in improving the long-term strength of the clinker, limitation of adulteration quantity of the raw batch and the clinker in cement and composite material preparation. The silicate clinker provided by the invention comprises steel slag, magnesium slag, coal ash, sandstone and limestone according to a certain proportion; the cement provided by the invention comprises the silicate clinker, coal ash, mineral waste residue and gypsum according to the certain proportion. As steel slag and magnesium slag are adopted as raw materials, the clinker of relatively high saturation ratio and silica ratio can be prepared easily, the strength of the clinker can be improved effectively, the adulteration proportion of cement admixture is improved, the burnability of the clinker is improved, and heat consumption is reduced; as industrial residues (steel slag and magnesium slag) are utilized effectively, the problems of environmental pollution and resource shortage are solved, and an effective way is provided for industrial residue treatment. Therefore, the social benefit, economic benefit and environmental benefit are very high.

The invention discloses a method for preparing high-ferric Alite-calcium barium sulphoaluminate cement by using red mud and barium mud. The mineral phases are as follows in percentage by weight: 5-8% of C(4-x)BxA3S, 15-19% of C2S, 30-45% of C3S, 25-45% of C4AF and 4-8% of C3A; the raw materials are as follows in percentage by weight: 10-20% of clay, 8-30% of red mud, 55-65% of limestones, 3-5% of gypsum, 0.3-0.5% of barium mud, 0-2% of bauxite and 0.4-1% of fluorite. The method comprises the following steps: crushing and homogenizing the raw materials and drying and polishing; preparing a round cake-shaped test sample which is 5cm in radius and 2cm in thickness, and calcining and cooling; and (6) crushing, and doping 8-12% of gypsum or dihydrate gypsum based on the total mass of the material, wherein the grinding fineness is 350m<2>/kg-450m<2>/kg or residue on sieve is 5% by a 200mesh sieve. The high-ferric Alite-calcium barium sulphoaluminate cement disclosed by the invention has the characteristics of low sintering temperature and small volume shrinkage, low cost and durability and the like as high-ferric or high-ferric aluminum industrial wastes and barium-containing industrial waste residues are used as raw materials.

The invention discloses high magnesium slag doped cement. The raw materials of the cement comprise the following main minerals in percentage by weight: 65-82% of limestone, 1-20% of magnesium slag, 5.5-9.4% of sandstone and 4-8% of coal gangue, wherein the magnesium slag comprises the following main chemical components: less than or equal to 55% and greater than or equal to 50% of CaO, greater than or equal to 20% and less than or equal to 30% of SiO2, greater than or equal to 8% and less than or equal to 12% of MgO, greater than or equal to 4% and less than or equal to 6% of Fe2O3, and greater than 0% and less than or equal to 2% of Al2O3. The cement is prepared by sequentially passing blended raw materials through a raw material drying mill, a raw material homogenizing silo, a decomposing furnace and a rotary kiln, blending the prepared clinker with coal ash, desulfurization gypsum and slag, and feeding the above materials into a cement mill. As high as 20% of magnesium slag is doped into the high magnesium slag doped cement, so that not only is the service life of a limestone mine prolonged, but also industrial wastes such as greatly piled magnesium slag are effectively utilized, the burnability of the clinker is also improved, the content of f-CaO in the clinker is reduced, and the national standard is met.

The invention relates to a mineralizer for producing silicate cement, particularly to a roasting compound mineralizer for cement with main component barium and trace auxiliary component copper. In the invention, barium dregs and copper dregs are used as main raw material, their weight percentage is (wt.%): barium dreg 50-80, copper dreg 20-50.

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.