11results about How to "Increases hydration activity" patented technology

The invention provides an electric furnace steel slag dry separation process and system, and the process comprises the following steps: magnetic separation iron removal: carrying out screening, crushing and magnetic separation iron removal on steel slag to obtain tailings; the tailings are ground, specifically, the tailings are ground into micron-sized powder; the micron-sized powder is subjected to wind separation, coarse powder and fine powder are obtained, and the cutting particle size of wind separation ranges from 40 micrometers to 50 micrometers; magnetic separation of the coarse powder: carrying out magnetic separation on the coarse powder to obtain fine iron powder and a non-magnetic material, and returning the non-magnetic material for grinding; and fine powder magnetic separation is conducted, specifically, the fine powder is subjected to magnetic separation, and inert minerals and active steel slag micro powder are obtained. According to the method, inert minerals in the steel slag can be recycled, so that the hydration activity and the utilization rate of the tailings are improved.

The application discloses a self-adaptive heavy metal solidification and blocking micro-particle, which comprises, from inside to outside, a heavy metal dissolution blocking agent inner core, a triggerable capsule wall and a heavy metal solidification agent shell layer arranged in sequence; wherein the heavy metal dissolution blocking agent inner core material is mainly obtained by compounding silicate and nano-scale active silicon dioxide, the triggerable capsule wall material comprises a pH trigger material and a heat-curing resin; and the heavy metal solidification agent shell layer material is mainly obtained by compounding and intercalating modified kaolin, a calcium-silicon ratio regulator and a sulfate. The application mainly reduces heavy metal dissolution of large-dosage steel slag micro-powder concrete in a service process from two aspects of early solidification and later prevention, and reduces the cracking risk of the large-dosage steel slag micro-powder concrete in a preventive and later compensatory mode; the application can meet the requirements of multiple scene services, and even when the concrete has slight cracks, the application will not increase the risk of heavy metal dissolution, and is suitable for popularization and application.

The invention discloses radiation-proof concrete as well as a preparation method and application thereof. The anti-radiation concrete provided by the invention comprises the following preparation raw materials in parts by mass: 100 parts of Portland cement; 0.1 part to 1 part of polypyrrole nanocrystal; 3 to 10 parts of acrylamide; 0.005 to 0.1 part of an initiator; 0.005 to 0.2 part of a cross-linking agent; 5 to 10 parts of steel slag; 8 to 20 parts of ferronickel slag; 160 to 200 parts of fine aggregate; 270 to 330 parts of coarse aggregate; 1 part to 3.5 parts of a water reducing agent; and 40 to 65 parts of water. The preparation method of the anti-radiation concrete is simple, and comprises the following steps: uniformly mixing all the components in batches, and forming and curing to obtain the anti-radiation concrete. The anti-radiation concrete disclosed by the invention has the advantages of strong neutron ray protection capability, high strength, moderate self weight and the like, the preparation method is simple, the raw materials are easy to obtain, and the anti-radiation concrete is suitable for large-scale industrial application in the field of radiation protection.

The application discloses a kind of based on molybdenum tailings stone powder replacement cement's cementitious material preparation method, the method includes: after molybdenum tailings are broken, ball milling, using alkaline activator and surface active regulator are wet mechanical chemical activation;Particle size distribution is obtained by airflow classification system regulation and control, continuous dense;The molybdenum tailings stone powder obtained and benchmark cement, auxiliary mineral admixture and functional additive are mixed according to proportion, form high packing density composite cement paste, wherein molybdenum tailings stone powder mass ratio reaches above preset threshold;After standard or accelerated maintenance, the obtained material 28 days compressive strength is not less than 42.5 MPa, 90 days strength continues to grow, and volume stability and working performance are excellent.The application is activated modification, grading optimization and multiple synergistic design, significantly improve molybdenum tailings cementitious activity, realize high value utilization of bulk solid waste at the same time, reduce energy consumption and carbon emission, suitable for large-scale production of green building materials.

The application discloses a kind of high-performance cement clinker based on lithium residue ion doping and crystal form regulation and its preparation method and application, belong to cement building material technical field.The raw material of the cement clinker includes the following mass percentage fraction: lithium residue 20~40%, calcium carbonate 50~70%, dihydrate gypsum 10~20% and di-aluminum oxide 2~6%;The minerals in the cement clinker include: C4A3:20%~35%, C2:50%~65%, C:5%~15%, the remainder is inevitable impurities by mass percentage.After the above raw materials are slurried with water, pressure forming is carried out, two-stage heating is sequentially carried out once sintering, and then quenching is carried out, and the cement clinker is obtained.The cement obtained from the cement clinker has excellent fast-setting and fast-hardening properties, and the compressive strength can reach more than 25MPa at 6h, and the compressive strength at 1d can reach more than 40MPa, which fundamentally solves the technical problems of poor early hydration performance, low strength and reverse shrinkage of high belite sulphoaluminate cement in the prior art.

The application discloses a controllable water-permeable solidified grouting material and a preparation method and application thereof, belongs to the technical field of geotechnical engineering foundation reinforcement and underground cavity filling, and aims to solve the technical problem that existing grouting materials are difficult to keep a certain solidified strength and accurately control the water permeability coefficient according to geological requirements to adapt to different hydrogeological environments. The controllable water-permeable solidified grouting material comprises, in weight parts, 45-55 parts of a main solidified base material, 8-18 parts of a water-permeable control system, and 25-35 parts of deionized water. The water-permeable control system comprises porous volcanic rock powder, lignin fiber and modified bentonite, and the mass ratio of the porous volcanic rock powder, the lignin fiber and the modified bentonite is 50:35:15. The porosity of the porous volcanic rock powder is 45%-55%, the length of the lignin fiber is 3 mm-6 mm, and the expansion rate of the modified bentonite is 150%-280%.

The invention discloses a calcareous material special for autoclaved aerated concrete and a preparation method thereof, the calcareous material comprises 90-96 wt% of limestone, 2-6 wt% of an iron raw material, 0-2 wt% of gypsum and 0-2 wt% of a silicon-aluminum material, and the calcareous material comprises the following minerals in percentage by mass: 42-55 wt% of f-CaO, 0-3 wt% of C4A3S, 22-45 wt% of the sum of the contents of C2S and C3S, 5-20 wt% of the sum of the contents of C3A and C4AF, 0-1.5 wt% of periclase and 0-2 wt% of gypsum, and the content of other impurity minerals is 0-6wt%. By optimizing mineral components and particularly controlling the content and activity of f-CaO, the content of silicate minerals is ensured, so that the proportion of the mineral components is beneficial to process production and quality control of the aerated concrete; the utilization rate of the calcium raw material is improved and the energy consumption is reduced through low-temperature calcination of a novel dry-process kiln.

The present invention relates to the technical field of solid waste resource utilization, and a method for preparing a sinter-free high-reflectivity ceramsite with solidified heavy metals is provided, and the specific steps are as follows: slag, fly ash, carbide slag powder, sludge powder, shell powder and titanium dioxide are placed in a dry powder mixing and stirring machine in sequence to obtain a dry powdered mixture; a certain amount of dry powdered mixture is taken and placed in a disc granulator, and a mixed solution is sprayed on a ball core, and a dry powdered mixture and a mixed solution are repeatedly added to the disc granulator to obtain a spherical raw material; the spherical raw material is placed on a rolling disc, and an anti-radiation coating is sprayed to obtain a raw material ball with a spray thickness of 0.4-0.8mm; a super-hydrophobic surface with a thickness of 0.4-0.8mm is sprayed on the raw material ball to obtain ceramsite; ceramsite is cured in a water bath curing box and a curing room in sequence to obtain sinter-free ceramsite. The present invention excites slag and shell powder by physical activation, saline-alkali activation and thermal activation to prepare sinter-free ceramsite with solidified heavy metals and high reflectivity.

The present invention provides a low-calcium, high-sulfur silicate cement clinker and a preparation method and application thereof. The mineral components of the low-calcium, high-sulfur silicate cement clinker include dicalcium silicate and calcium sulfate, and the sum of the masses of the two is not less than 68% of the total mass of the silicate cement clinker. At the same time, the mass ratio of calcium sulfate to dicalcium silicate is not less than 0.13. The present invention also provides various cements prepared based on the low-calcium, high-sulfur silicate cement clinker, and methods for preparing the low-calcium, high-sulfur silicate cement clinker and the cement. The low-calcium, high-sulfur silicate cement clinker of the present invention has the advantages of high early strength, continuous growth in late strength, and low CO2 emissions.

The invention relates to the technical field of cementing material clinker preparation, and particularly discloses an early-strength, high-strength and high-wear-resistance iron aluminate cementing material and a preparation method thereof. The cementing material clinker comprises the following mineral phases in percentage by mass: 30-50% of calcium ferrous sulfide aluminate (C4A3-xFx, x is greater than or equal to 0.3 and less than or equal to 0.7), 25-43% of calcium ferrous aluminate (C6AF2), 20-25% of dicalcium silicate (C2S) and the balance of inevitable impurities, and Na, P, B and Sm elements are in solid solution in the calcium ferrous sulfide aluminate mineral phases, the calcium ferrous aluminate mineral phases and the dicalcium silicate mineral phases. The ferrous aluminate cementing material clinker disclosed by the invention not only can avoid the problem that the strength of a ferrous aluminate cementing material is reduced, but also can improve the stability of a C2S mineral phase and improve the early mechanical strength of the cementing material.

The application provides a method for improving early activity of cement by refining activated belite minerals, and belongs to the field of building materials. In the clinker calcination process, the first step is to control the firing temperature to be 1100-1200 DEG C, and the holding time is 1-2 h, so that a large amount of C5S2$ minerals are generated; the second step is to increase the calcination temperature to 1280-1320 DEG C, and the holding time is 1-2 h, so that the C5S2$ minerals are not completely decomposed, and most of them are converted into alpha'-C2S and C$ clinker minerals with small grain size. In addition, the mineralization technology is used to promote the generation of a large amount of C3S at about 1300 DEG C, the ion doping is used to distort the C2S mineral lattice and the C3S mineral lattice, and the crystal defects of the high belite cement clinker minerals are increased, so that the grain size of the clinker minerals is refined. The above-mentioned methods work together, the grain size of the high belite cement clinker is refined, and the early activity of the high belite cement is improved. The preparation method solves the problems of low early activity of the high belite cement, and the prepared high belite cement clinker has the characteristics of small grain size and containing alpha'-C2S minerals.