127results about How to "Improve activity index" patented technology

The invention relates to an admixture for high early strength of concrete, characterized in that the admixture is formed by mixing and stirring cement clinkers, industrial residues, early strength agents, plaster, water reducing agents and excitants. The parts by weight of the components are as follows: 100 parts of cement clinkers, 500-2000 parts of industrial residues, 0.2-3 parts of early strength agents, 1-3 parts of plaster, 0.2-2 parts of water reducing agents and 1-5 parts of excitants. The excitant is the mixture of aluminum hydroxide, calcium nitrite and calcium nitrate; wherein, the aluminum hydroxide accounts for 50% of the mixture while the calcium nitrite and the calcium nitrate are in any proportion; the early strength agent is the mixture of trolamine, lithium carbonate and calcium formate, wherein, the trolamine accounts for 50% of the mixture while the lithium carbonate and the calcium formate are in any proportion. The admixture for concrete provided by the invention has high activity index and low content of harmful ions. Adding the admixture can obviously improve the demoulding strength, long-term mechanical property and durability of the concrete.

The invention discloses a modified steel slag composite admixture and a preparation method thereof. The modified steel slag composite admixture comprises 55-75wt% of micro mineral slag powder, 20-40wt% of micro steel slag powder, and 1-5wt% of sintering desulphurization slag. Concrete prepared by mixing the modified steel slag composite admixture of the invention with cement has the following characteristics: the seven day active index is greater than 75%, the twenty-eight day active index is greater than 100%, the specific surface area is equal to or greater than 400m<2>/kg, the sulfur trioxide content is equal to or less than 4.0%, the chloride ion content is equal to or less than 0.06%, the ignition loss amount is equal to or less than 3.0%, and the autoclaving stability is qualified. The modified steel slag composite admixture which allows a low early strength disadvantage of steel slag composite admixtures to be overcome, working performances of concrete to be effectively improved, the strength and the endurance of concrete to be improved, and energy consumption required by slag grinding to be effectively reduced and is in favor of the low carbon economy realization, is a resource use type concrete admixture.

The invention discloses a vertical mill slag grinding aid and a preparation method thereof. The slag grinding aid comprises the following components in percentage by weight: 5 to 40% of polyol amine, 10 to 60% of polymeric polyol, 5 to 40% of polyol, 3 to 20% of inorganic salts, and the balance being water. The provided preparation method is suitable for the production of vertical mill slag grinding aid. The slag yield is increased by 5 to 20%. The activity indexes of slag are increased to different degrees. The fineness (residue on sieve) and specific surface area of mineral powder are prominently improved, and the performance of cement is not influenced. The preparation method can improve the fluidity of mineral powder, thus reduces the phenomenon of over grinding, improves the powder selecting efficiency, and prominently increases the content of fine particles with a size less than 32 [mu]m. The provided preparation method improves the grinding efficiency of grinding machine, reduces the wear degree of grinding machine, thus reduces the maintenance cost and production cost, and has a high performance/cost ratio. Moreover, the production technology and equipment are simple and practical.

The invention discloses a grinding additive for powder-grinding steel slag in a vertical mill. The grinding additive is prepared from the following raw materials in percentage by weight: 1-5 percent of polyacrylic acid, 5-10 percent of molasses, 1-5 percent of sodium hexametaphosphate, 2-6 percent of tetraethylammonium oxalic acid, 3-10 percent of triethanolamine, 5-20 percent of aluminum sulfate and 46-81 percent of carriers. All components of the grinding additive are cooperated with each other, so that the grinding efficiency of the steel slag in the vertical mill is improved, the active indexes are improved, and the adverse effect on cement and concrete performance is avoided. Compared with the prior art, the grinding additive for grinding steel slag in the vertical mill has the advantages that a material layer can be stabilized, the yield of the mill is increased, and the active indexes of the high steel slag powder 7d and 28d can also be increased.

The invention discloses an active excitatory grinding aid for ferronickel slag and a preparation method for the active excitatory grinding aid. The grinding aid is composed of polymeric glycol, cocoanut fatty acid diethanolamide, sodium pyrophosphate, ethyl acetate, an excitant and water, wherein the excitant is composed of calcined alunite, water glass and sodium abietate. The additive amount of the grinding aid in the ferronickel slag is 0.02-0.10% by mass of the ferronickel slag. The active excitatory grinding aid disclosed by the invention is sufficient in raw materials, simple to process and prepare, low in doping amount, stable in performance and high in cost performance. As the ferronickel slag which is ground is added, the problem that the ferronickel slag is poor in grindability can be solved. Under the condition that the grinding time is equal, the specific surface area of the ferronickel slag micropowder can be improved by 4.5-9%, the mill output is increased by over 15%, the energy consumption is remarkably reduced, and moreover, the active index of the ferronickel slag can be further improved by 10-35%.

The invention discloses a technology of producing high-activity steel slag powder and an inert mineral product by using steel slag. The technology comprises the six steps of dry process grinding, pneumatic separation, dry process magnetic separation, wet process grinding, wet process magnetic separation and dehydration. In the step of the dry process grinding, tailings after slag iron are recovered are ground into steel slag powder, and inert mineral dissociation is realized; in the step of the pneumatic separation, the steel slag powder is subjected to size grading by using a superfine powder concentrator, so that the enrichment of inert minerals in coarse powder is realized, and fine powder is a high-activity steel slag powder product; in the step of the dry process magnetic separation, the coarse powder is purified to be coarse concentrate by employing the magnetism of the inert minerals, and coarse tailings return back to the dry process grinding step; the coarse concentrate is made into fine pulp through the wet process grinding; the fine pulp is separated into a humid inert mineral raw material and a humid cement iron raw material through the wet process magnetic separation; and after the humid inert mineral raw material and the humid cement iron raw material are dehydrated separately, the inert mineral product and a cement iron raw material are obtained, and water returns to the wet process grinding step. According to the technology, the steel slag is processed into the high-activity steel slag powder, the high-iron-grade inert mineral product and the cement iron raw material, so that the full resource utilization of the steel slag is realized.

A method of grinding steel slag powder and mine slag powder and producing steel and iron slag powder by a vertical grinding mill is disclosed. The method is characterized in that: the same vertical grinding mill is adopted to separately grind the steel slag powder and the mine slag powder; the grinding of the steel slag powder by the vertical grinding mill includes steps of grinding the steel slag powder by the vertical grinding mill and performing material-returning closed-loop circulation of the steel slag powder by the vertical grinding mill; the grinding of the mine slag powder by the vertical grinding mill includes steps of pretreating mine slag to remove metals, grinding the mine slag powder by the vertical grinding mill and performing material-returning closed-loop circulation of the mine slag powder by the vertical grinding mill; and the steel slag powder and the mine slag powder which are prepared by the vertical grinding mill and are qualified are respectively weighted by a corresponding seal constant weight feeder, fed into a rolling type material mixer and fully mixed, thus achieving a process of producing the steel and iron slag powder. The yield of the steel slag powder reaches 45 t/h. The yield of the mine slag powder reaches 60 t/h. The specific surface area of the steel slag powder is larger than 460 m<2>/kg, and the specific surface area of the mine slag powder is larger than 430 m<2>/kg, thus meeting the national standards. The single-machine product power consumption of the steel slag powder is 30 kwh per ton, and the single-machine product power consumption of the mine slag powder is 28 kwh per ton.

The invention relates to a fly ash composite admixture for concrete, and a preparation method of the admixture, and belongs to a building material for building, and a preparation method of the building material. The fly ash composite admixture and the preparation method mainly solve the technical problems that the existing mineral admixture is too large in slump, larger in chemical shrinkage and self-shrinkage, and high in use cost. The fly ash composite admixture for the concrete adopts the technical scheme that the fly ash composite admixture is prepared by taking 20-30wt% of slag, 4-15wt% of stone chips, 58-73wt% of fly ash and 1-4wt% of desulphurization gypsum as raw materials. The preparation method comprises the following steps that the fly ash is smashed into ultrafine fly ash by ultrafine smashing equipment; the slag, the stone chips and the desulphurization gypsum are mixed uniformly and ball-milled into powder; the ultrafine fly ash and the ball-milled powder are mixed and homogenized; and the fly ash composite admixture for the concrete is prepared.

The invention discloses a high-molecular slag grinding aid with the general formula shown in the specification. In the general formula, x is a value of 5-8000, and x:y:z is equal to 1:0.1-1:0.1-0.6. The invention aims at providing the high-molecular slag grinding aid capable of effectively shortening slag grinding time and improving slag hydration activity.

The invention discloses a slag grinding aid, which comprises the following components in percentage by weight: 40-60 percent of polymeric polylol, 5-15 percent of molasses, 2-8 percent of calcium lignosulphonate, 4-6 percent of glycerol and the balance of water. Due to the adoption of the slag grinding aid, the grinding efficiency of slag and the machine-hour yield of a grinder are increased, and the effect of improving mineral powder activity index can be enhanced. The slag containing a large quantity of vitreous bodies is ground separately, and the slag grinding aid is doped, so that the grinding efficiency can be increased by 10-15 percent, the energy consumption is lowered by 10-15percent, the 7-day activity index of slag fine powder obtained by grinding is increased by 4-6 percent, and the 28-day activity index is increased by 2-4 percent; and after slag mineral powder is added into cement, the cement mortar flowing degree is increased by 5-10 percent.

The invention relates to a granulated blast furnace slag liquid composite grinding aid and belongs to the technical field of granulated blast furnace slag grinding process admixtures. The granulated blast furnace slag liquid composite grinding aid is prepared from triethanolamine, mixed alcohol, propanetriol, molasses, potassium carbonate, sodium pyrophosphate, sodium sulfate and water; and the granulated blast furnace slag liquid composite grinding aid is formed by composition of the most common chemical raw materials and industrial wastes, and has the advantages of low toxicity, no volatilization, stable sources, sufficient sources and low cost. After the granulated blast furnace slag liquid composite grinding aid provided by the invention is added into a grinding machine, the distribution and appearance of slag powder particles can be improved, the adverse effects on quality of slag powder are avoided, the effects of saving power consumption and improving grinding efficiency can be realized, and the granulated blast furnace slag liquid composite grinding aid has the advantages of better increasing the yield and improving the quality of the slag powder. Under the situation of same grinding time, the specific surface area of the slag powder is effectively improved, the screening residues are reduced, and the activity indexes of the slag powder in the early stage (7d) and the late stage (28d) are significantly improved.

The invention relates to a mineral waste residue liquid composite grinding aid and a preparation method thereof. The mineral waste residue liquid composite grinding aid is prepared from the following raw materials: 15-20 parts by weight of mixed alcohol, 5-10 parts by weight of ethyl acetate, 5-10 parts by weight of molasses, 1-10 parts by weight of lauryl sodium sulfate, 1-10 parts by weight of sodium hexametaphosphate and 800-100 parts by weight of water. The mineral waste residue liquid composite grinding aid has low toxicity, does not volatile and is stable in sources, sufficient in supplies, simple to process and prepare and low in cost; after granulated blast-furnace slag is doped in the mineral waste residue liquid composite grinding aid, the distribution and the morphology of separate particles can be improved, and the quality of mineral waste residue micro powder is not affected; the mineral waste residue liquid composite grinding aid has the advantages of increasing the yield and improving the quality of the mineral waste residue micro powder and meanwhile greatly reduces the energy consumption. The mineral waste residue liquid composite grinding aid has stable property, high cost performance and wide adaptability, is low in cost and mixing amount and can be used for improving the grinding effect and increasing the yield of a grinder by above 15%, the specific surface area of the mineral waste residue micro powder by 4.7%-6.2% under the condition of the same grinding time and the activity index of the mineral waste residue micro powder.

The invention relates to the technical field of production and processing of cement, and provides a slag compound activating grinding aid and a preparation method thereof. The slag compound activating grinding aid comprises the following components in percentage by weight: 5-10 percent of water glass, 5-10 percent of sodium carbonate, 3-8 percent of sodium abietate, 12-20 percent of betaine mother liquor, 7-12 percent of non-ionic surface active agent, 2-10 percent of molasses, 5-10 percent of water-soluble polymer and the balance of water. The preparation method comprises the steps of: sequentially adding water glass, sodium carbonate, the betaine mother liquor and the non-ionic surface active agent in water with a temperature of 40-65 DEG C according to the weight ratio, uniformly stirring; then adding sodium abietate, molasses and the water-soluble polymer, and uniformly stirring to obtain the liquid slag compound activating grinding aid product. According to the slag compound activating grinding aid, the production cost is lowered, and the damage to the environment is reduced; the slag compound activating grinding aid is stable in application property, and remarkable in effects of enhancing and improving activation grinding assistance of slag and physical properties of the cement.

The invention provides a construction waste activating method which comprises the following steps: performing primary calcination on construction wastes at a temperature of 600-800 DEG C for 3-5 hoursso as to obtain a first calcined material; mixing the first calcined material and gypsum powder, lime powder and slag powder, and performing secondary calcination on the obtained mixed material at atemperature of 850-950 DEG C for 2-5 hours so as to obtain a second calcined material; and performing chemical excitation on the second calcined material in an alkaline environment, thereby obtainingthe activated construction powder. According to the activating method provided by the invention, the obtained activated construction powder has characteristics of binding materials, so that the construction powder can serve as a binding material to be applied to non-sintered building materials, and reutilization of the construction wastes is realized. Experimental results in the embodiment show that the activated construction powder has high activity index, the activity index within 3 days is 83.9, and the activity index within 28 days is 92.9.

A trigger for stimulating the early-phase activity of the blast furnace slag powder or the mixture of blast furnace slag powder and cinder powder is proportionally prepared from triethanolamine and early strengthening agent (calcined gypsum or bihydrated gypsum or potassium chromium sulfate).

The invention discloses a steel slag grinding aid. The grinding aid comprises the following raw material component in parts by weight: 8-12 parts of acrylamide, 8-12 parts of benzamide, 15-20 parts of alkanolamine, 5-10 parts of ethylene diamine phosphate, 10-15 parts of calcium lignin sulfonate, 8-12 parts of sodium lignin sulfonate, 0.1-0.5 part of tributyl phosphate and 20-80 parts of water. The preparation method comprises the steps of adding acrylamide, benzamide, alkanolamines in water in a certain ratio, dissolving, then sequentially adding ethylenediamine phosphate, calcium lignin sulfonate and sodium lignin sulfonate, mixing and finally adding tributyl phosphate, stirring to obtain steel slag grinding aid. The process is simple and the activity index of steel slag can be regulated.

The invention discloses a powdered ore additive. The powdered ore additive comprises the following components by weight: 5 to 20% of aqueous polymer, 10 to 40% of furfural residue, 0.5 to 1.5% of gallic acid, and 50 to 80% of coal ash. The aqueous polymer adopts vinyl acetate and maleic anhydride as the polymerizing monomers, water serves as the reaction medium, and the free radical polymerization is carried out, thus obtaining the powdered ore additive. The powdered ore additive is remarkable in grinding aid effect, about 20% of output of a grinding machine can be increased, the activity of the powdered ore can be effectively excited, and about 10% of 28-day activity index of the powdered ore can be increased.