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

The invention relates to a high-performance cement expansive agent and a production method thereof. Aluminate expansive chamotte calcined at high temperature in a rotary kiln, other aluminum chamotte, anhydrite, desulfurized gypsum and polyalcohol ether (a reducing component) are mixed together according to a certain proportion to form the high-performance cement expansive agent. The production method comprises the following steps: firstly adding the blocky aluminate expansive chamotte into a vertical mill so as to pulverize the chamotte to a certain specific surface area; then adding the anhydrite, the desulfurized gypsum and the other aluminum chamotte together into a ball mill so as to pulverize the mixture to a certain specific surface area; and during the pulverizing in the ball mill, spraying the reducing component into the ball mill after atomizing the reducing component through a special device so as to evenly mix the components and obtain the finished product. Through the full use of the difference between the grinding performances of different mineral materials, the method compounds the recipe and carries out the process parameter control so as to realize the reasonable gradation of the particles. The high-performance cement expansive agent can reduce or avoid the problems that: a concrete structure produces harmful cracks due to early contraction, dry shrinkage and cold shrinkage, thereby bringing about structural leakage. The high-performance cement expansive agent can be used for continuous production, and has high compensation and contracting performance and convenient use.

The invention belongs to the technical field of building materials, and particularly relates to a high-anti-permeability cement-based repair material for tunnel engineering. The repair material consists of portland cement, coal ash, silica fume, steel slag powder, rock powder, tailing sand, quartz sand, attapulgite, acrylate emulsion, cellulose ether, polyacrylamide, PVA fibers, PET fibers, a polycarboxylic acid water reducer and a defoaming agent. The repair material has the characteristics of easy construction, good working performance, good water retention performance, high compressive strength, high anti-permeability level, high toughness and adhesion, excellent durability and the like; and the repair material can be suitable for construction initial protection or engineering later maintenance and repair of lining concrete in the tunnel engineering.

The invention provides high-strength gypsum-based self-leveling mortar. The gypsum-based self-leveling mortar comprises alpha hemihydrate gypsum and two types of mineral sand with different fineness.The invention also provides a preparation method of the high-strength gypsum-based self-leveling mortar. The method includes the following steps: evenly mixing the alpha hemihydrate gypsum, binding materials other than the alpha hemihydrate gypsum, the mineral sand with the different fineness and admixtures, adding the mixture to water, and respectively performing impregnating and stirring for a while. The gypsum-based self-leveling mortar prepared by the method has the strength as high as cement-based self-leveling mortar.

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 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 high performance concrete composite mineral additive prepared from construction wastes. The additive comprises 1 to 99 wt% of powdery construction wastes and 1 to 99 wt% of active additive. According to the preparation method, the powdery construction wastes are mixed with at least one component of slag powder, steel slag powder, fly ash, silica fume, meta-kaolin powder, and limestone powder according to a certain ratio, and then the mixture is subjected to ultrafine powder processing. The provided high performance concrete composite mineral additive has the advantages of fineness, reasonable and continuous grain size gradation, and high activity. The prepared concrete containing the additive can meet or even exceed the standards of common high performance concrete.

The invention discloses a preparation method of a composite prefabricated part lining for a high-temperature lime rotary kiln, and belongs to the technical field of refractory material production equipment. The preparation method is characterized by comprising the following steps: (1) weighing and preparing raw materials; (2) putting the prepared raw materials into a material crusher in a classified manner, respectively crushing the raw materials into required particle sizes according to requirements, then uniformly mixing, adding water the weight of which accounts for 4-6wt% of the total weight of the raw materials, and uniformly stirring in an environment at the normal temperature of 5-25 DEG C; (3) pouring and molding the mixed material stirred by adding water in a model to obtain a blank; and (4) baking the blank at low temperature until the blank is shaped. The rotary kiln lining is prepared from the magnesium-chromium sand and the magnesium aluminate spinel, has the characteristics of high temperature resistance, corrosion resistance, good wear resistance and no ring formation, solves the problems that the high-temperature lime rotary kiln lining is not resistant to corrosionand short in scouring service life, and improves the production efficiency.

The invention relates to a preparation method of an SMT (surface-mounted technology) adhesive, and belongs to the technical field of binding materials. According to the preparation method of the SMT adhesive, micro silicon powder is taken as packing for preparation of the SMT adhesive, does not easily react with other substances and does not chemically react with most acid and alkali, particles ofthe micro silicon powder uniformly cover the surface of an object and have higher corrosion resistance, tensile strength and compressive strength of a cured product can be enhanced, and wear resistance can be improved; besides, the micro silicon powder is high in purity, low in impurity content and stable in performance and can reduce exothermic peak temperature of an epoxy resin curing reaction,reduce linear expansion coefficient and shrink rage of the cured product and increase flame retardant property, so that the high-temperature resistance of the SMT adhesive is improved. By means of addition of talcum powder for preparation of the SMT adhesive, the talcum powder can be subjected to a chemical reaction with an organosilicon functional group in a silane coupling agent, silicon oxygenbonds with certain adhesive strength and protection force are formed, a coating can continuously bear certain heat load, high-temperature adhesive force is increased, and the high-temperature resistance of the SMT adhesive is improved accordingly.

The invention discloses an ash residue treatment method and an autoclaved brick manufacturing method, relating to the technical field of catalytic coal gasification and aiming at solving the problem of very low comprehensive utilization ratio of useful components in ash residue. The ash residue treatment method comprises the step of treating the ash residue to be treated by using a digesting agent and washing liquor. The autoclaved brick manufacturing method comprises the steps of pressing the ash residue treated by the ash residue treatment method into an autoclaved brick green body, and carrying out steam press maintenance on the autoclaved brick green body to obtain an autoclaved brick. The ash residue treatment method and the autoclaved brick manufacturing method have the beneficial effects that the ash residue is treated to obtain a catalyst and an autoclaved brick raw material in the ash residue, the autoclaved brick raw material is manufactured into an autoclaved brick, and the comprehensive utilization ratio of the useful components in the ash residue is improved.

The invention discloses a cement final grinding system based on a roller press. The cement final grinding system comprises the roller press, a material stabilizing bin, a V-shaped powder concentrator, an iron removal device, an elevator, a multi-rotor dynamic powder concentrator, a cyclone dust collector, a fan, a dust collector and a ball mill. A feed port of the elevator communicates with a belt conveying device from a cement distribution station, and a discharge port of the elevator is connected with a feed port of the V-shaped powder concentrator through the iron removal device. According to the cement final grinding system based on the roller press, by means of the roller press final grinding system taking the roller press and the multi-rotor dynamic powder concentrator as core equipment, reasonable finished product grain composition is guaranteed, then the quality of cement is guaranteed, meanwhile, through reasonable design of the technological process, the efficiency of the roller press is exerted to the maximum extent, and the yield is improved; and the material proportion of circulating grinding in the system is reduced, then energy consumption is reduced, part of equipment in an original ball mill grinding system is utilized, and the cost is controlled on the basis of increasing the yield and reducing consumption.

The invention discloses a ceramic body pulverizing, granulating and drying method. The method comprises the process steps:1, breaking mineral aggregates into gravel raw materials with the sizes of less than or equal to 30mm and conveying the gravel raw materials with different components into different raw material tanks respectively; 2, conveying the gravel raw materials in the raw material tanks to a homogenizer for homogenization in proportion; 3, conveying the homogenized materials to a pulverizer for grinding and performing separation through a grader, wherein qualified fine powder of more than 200 meshes is collected by a pulse collector; 4, conveying the qualified fine powder into a granulator for making the powder into solid particles, wherein the solid particles meet the granulating requirements that the volume weight is 1,000-1,200g/l, the fluidization angle is 25-35b and the percentage of the particles of 40-60 meshes is more than 60%; and 5, conveying the qualified particles into a fluidization bed for drying, and discharging the particles. According to the method, the investment is 1/2 of that of wet granulation, the production cost is reduced by more than 1/2, production indexes are superior to those of drying tower granulation, the energy and water are saved, a technological process is simple, and the production cycle is short.

This invention discloses technique to increase yield and quality when it grinds the plant in open flow system, which is characterized in that, slow releasing solid grinding aid with cool water with pH value of 6~8 at temperature below 25Deg, preparing liquid grinding aid on field, and adding into grinder with controlled precise quantity. With the technique, it can increase whole effect 10~25% for three grinders; it can control precisely the hole sizer of fineness 4900 when residual is 1.5~5.0%, and the special surface area 320~450m2/kg; the temperature when cement prepared can decrease 10~20Deg; it increases the special surface area with 10~40m2/kg and early strength with 0.5~1.5MPa for same condition separately.