30results about How to "Reasonable particle gradation" patented technology

The invention belongs to the technical field of building materials, and specifically relates to a high-impermeability cement-based repair material for tunnel engineering, which is composed of Portland cement, fly ash, silica fume, steel slag powder, rock powder, tailings sand, quartz sand, Attapulgite, acrylate emulsion, cellulose ether, polyacrylamide, PVA fiber, PET fiber, polycarboxylate water reducer and defoamer. The invention has the characteristics of easy construction, good workability, good water retention, high compressive strength, high impermeability grade, high toughness, cohesiveness and excellent durability; the product of the invention can be applied to the construction of lining concrete in tunnel engineering Initial protection or post-project maintenance and repair.

The invention discloses an energy-saving and environment-friendly cement clinker preparation system, which includes a raw material preparation system, a raw material homogenization system, a fed raw material conveying system, a cement and pulverized coal preparation system and a cement clinker calcination system, wherein a material outlet of a loading bucket elevator is connected with a material inlet of a raw material homogenization air conveying chute; a material outlet of an unloading chain conveyer is connected with material inlets of two unloading bucket elevators respectively; a material outlet of a raw material feeding spiral conveyer is connected with a material inlet of a preheater; a material outlet of a spiral pneumatic conveying pump is connected with a material inlet of a decomposition furnace; a material outlet of another spiral pneumatic conveying pump is connected with a material inlet of a four-passage pulverized coal combustion device; a hot air outlet of an air-beam type grate cooler is connected with an air inlet of an air-swept coal mill; one material outlet of an electric tee scraper-trough conveyer and a material outlet of a kiln tail dust collection spiral conveyer are both connected with a material inlet of a re-homogenization loading chain conveyer. The system has the advantages as follows: the yield of the clinker is increased, the energy consumption is lowered, the emission is reduced, the quality of the clinker is improved, and the quality of the cement is stable.

The invention discloses a liquid cement grinding aid. The liquid cement grinding aid comprises the following components by weight percent: 10-24% of triethanolamine, 10-16% of polymeric polyol, 10-13% of molasses, 1-3% of calcium formate, 3-5% of sodium acetate, 5-10% of sodium thiosulfate and the balance water. Compared with the prior art, the liquid cement grinding aid has the advantages that the grain composition of a cement material is changed, the strength of cement is improved, enhancing effect of the cement mixed with a large quantity of limestone is improved obviously; the cost is lower as the using amount of triethanolamine is reduced; the cement output in the unit time is increased effectively, and the power consumption of per unit output is reduced as the mixing amount in the cement finishing process is low; the liquid cement grinding aid is green and environmental-friendly and cannot hurt people, or cannot damage buildings and the like as chloridion content is not contained.

A high-strength alkali-resistant castable prepared from coal gangue and a method thereof belong to the technical field of refractory castables. It is composed of coal gangue, silicon micropowder, coke gemstone micropowder, calcium aluminate cement, and admixtures. The particle size and mass percentage of each raw material are: coal gangue: 10% to 20% of particle size 5mm ~ 8mm, coal gangue: particle size 3mm ~ less than 5mm 10-25% of coal gangue: 20-30% of particle size 1mm-less than 3mm, coal gangue: 10-40% of particle size less than 1mm, burnt gem: 0-10% of particle size 5μm, silicon powder: 2-10% , Calcium aluminate cement: 5-15%, admixture: 0.1-0.4%. The invention has the advantages of fully utilizing the waste coal gangue resources, and the high SiO2 content in the coal gangue can prepare high-strength alkali-resistant castables with excellent alkali resistance and low price. This kind of castable can be widely used in the preheater and grate cooler of the new dry process cement rotary kiln system, where the alkali erosion is relatively serious and the thermal engineering is similar.

The invention discloses a liquid cement aid grinding reinforcing agent and a preparation method and application method thereof. The liquid cement aid grinding reinforcing agent is prepared from, by weight, 40-60 parts of triethanolamine, 0.1-5 parts of molasses, 1-10 parts of glycerinum, 0.1-5 parts of amphoteric polymers, 0.1-5 parts of sodium humate and 30-80 parts of water; PEO-b-PPO is adopted as the amphoteric polymers. According to the liquid cement aid grinding reinforcing agent, the early strength and later strength of cement which is added with the liquid cement aid grinding reinforcing agent after powder grinding is performed are both improved.

The invention discloses a compression-resistant and heat-preserving concrete. The raw materials include: cement, fine aggregate, coarse aggregate, and auxiliary materials; the cement includes aluminate cement and white cinder The cinder compound has a weight ratio of 200‑400:35‑65. The invention improves the thermal insulation performance of concrete, solves the problem of poor concrete thermal insulation that has been plagued for many years, and enhances the toughness and compressive strength of concrete, effectively enhances the mechanical properties of concrete, and makes the concrete quality stable and durable. And reduce the manufacturing cost of commercial concrete, improve the quality of commercial concrete, and further expand the overall competitive advantage.

The invention discloses an application method of a support mortar coagulant prepared from coal gangue. The preparation method of the coal gangue coagulant is as follows: firstly, the coal gangue is crushed and then dry-milled to obtain coal gangue powder with a particle size of 100-500 μm. Then, according to parts by weight, add 20-30 parts of coal gangue powder, 150-160 parts of water, 240-300 parts of grinding body, and 0.01-0.05 parts of surface passivator into the wet grinding equipment for grinding for 40-60 minutes to obtain a particle size below 0.3 μm gangue slurry. The application of the coagulant in the support mortar: 25-45 parts of ordinary Portland cement, 7-20 parts of water, 2-10 parts of coal gangue coagulant, 40-60 parts of quartz sand, 0.1-20 parts of high-efficiency water reducer 0.25 parts, expansion agent 3-5.5 parts, defoamer 0.03-0.2 parts, composite fiber 0.05-0.3 parts. The early strength of the prepared support mortar can reach 22.9-24.8MPa in 2 hours, and the later strength can reach more than 70MPa without shrinkage, and the fluidity is increased by 40-60%.

The invention discloses a cement grinding aid as well as a preparation method and an application method thereof. The cement grinding aid comprises the following raw materials in parts by weight: 5-15 parts of triethanolamine, 5-20 parts of honey, 1-5 parts of sodium gluconate, 1-5 parts of N-sulfo-glucosamine potassium salt, 5-10 parts of C1-C3 alcohol and 40-100 parts of water. The invention aims to provide the cement grinding aid that the grain composition of cement added with the cement grinding aid is reasonable after powdering, the fineness of cement is appropriately reduced, the strength of grinded cement can be improved, and the comprehensive effect is relatively good.

The invention relates to a preparation method for a microcrystalline alumina high-temperature rotary kiln inner lining, and belongs to the technical field of preparation of microcrystalline alumina and high-end aluminum refractory smelting materials. It is characterized by comprising the following steps: weighing raw materials, kneading, adding water and stirring, pouring and forming, and baking at low temperature to finalize the shape. The invention makes full use of corundum and mullite as main raw materials, and adds some additives as auxiliary raw materials to cast into prefabricated parts, and mainly solves the problem of high temperature resistance of refractory materials in the high-temperature alumina rotary kiln with harsh microcrystalline alumina calcination conditions and not being eroded and worn. , small volume change in hot and cold state, low service life of rotary kiln lining, etc., high-performance rotary kiln prefabricated lining is prepared. The rotary kiln prefab inner lining prepared by the invention has the characteristics of wear resistance, good corrosion resistance and small volume change under high temperature in the application in the new field of microcrystalline alumina calcination, and solves the problem of low life during use and frequent replacement of the inner lining. and other problems, correspondingly reduce labor intensity and improve production efficiency.

The invention relates to a solid material grinding method and a grinding machine. Solid materials enter a grinding body of a grinding room after being subjected to primary air classification, and are thrown onto a lining plate along the radial direction to be broken due to collision under the centrifugal effect of the grinding body in high-speed rotation; after rebounding from the lining plate, the broken materials oppositely collide newly-added materials to be broken; large-particle materials drop under the gravity effect and upwards enter a working cabin through a guide pipe after being subjected to high-speed hammering; the working bin has the functions of feeding and wind mixing elutriation; the materials subjected to wind mixing elutriation enter a classifier to be classified; finished material products achieving the granularity requirements are collected by a spiral collector and a bag-type dust remover and then are discharged from a finished product discharging device; and materials not achieving the granularity requirements are returned to the grinding room to be reground. The grinding machine has the beneficial effects that the grinding granularity is small, the grinding efficiency is high, the fine powder collecting effect is good, the equipment is compact in structure, the maintenance cost is low, powder bodies with the granularity in a range of 80-1,500 meshes can be produced, and the grinding machine has the advantages of high yield ad stable quality particularly when producing ultrafine powder with the granularity being greater than 800 meshes and materials with higher rigidity.

The invention relates to a preparation method for a pellet rotary kiln lining without ring formation, belonging to the field of refractory materials. The preparation method is characterized by comprising the following steps: weighing of raw materials, mixing, water addition and stirring, pouring molding, and low-temperature firing until shaping is completed. The preparation method provided by theinvention fully utilizes titanium-iron alloy industrial by-products as raw materials, solves the problem of treatment of industrial solid wastes, realizes waste reutilization, and prepares a high-performance rotary kiln lining at the same time. The rotary kiln lining prepared by using the preparation method provided by the invention has the characteristics of good wear resistance and no ring formation, so the trouble of clearing rings in the process of application is solved, and production efficiency is improved.

The invention discloses a high efficiency cement composite grinding additive, comprising the following raw materials by weight percent: 10-25% of calcined gypsum, 10-30% of calcined aluminite, 20-40% of sodium metasilicate, 2-4% of triethanolamine, 0.5-2% of polyacrylate, 0.5-3% of dispersant and 20-30% of zeolite powder. The preparation method of the high efficiency cement composite grinding additive comprises the following steps: first selecting raw materials, then dripping liquid raw materials-triethanolamine and polyacrylate TH-1100 with a liquid pump in zeolite powder, then preparing reinforced grinding component with a dry powder mixer, finally adding the reinforced grinding component, calcined gypsum, calcined aluminite, sodium metasilicate and dispersant in a kneader to mix for 20-30min and obtaining the product. The product has prominent grinding aid, and can increase the hourly output of mills by 10-15%, reduce the consumption of electricity, and increase the cement 3-day compression strength and the cement 7-day compression strength by more than 20% and the cement 28-day compression strength by 10-15%.