121 results about "Anhydrite" patented technology

The invention provides a mining inorganic environment-friendly reinforcing material and application thereof, and belongs to the technical field of mining reinforcing materials. A component A comprises the following components in parts by mass: 60-80 parts of anhydrite, 5-20 parts of lime, 5-10 parts of silica fume, 2-8 parts of sodium silicate, 1-0.5 part of a naphthalene water reducer, 3-7 parts of an early strength agent and 0.2-0.8 part of lithium salt; the component B comprises the following components in parts by mass: 50-70 parts of cement clinker, 10-30 parts of slag cement, 5-10 parts of iron powder, 1-8 parts of aluminum sulfate, 5-10 parts of calcium carbonate and 0.5-1 part of sodium tripolyphosphate; the component C is prepared from the following components in parts by mass: 10 to 25 parts of water glass, 10 to 20 parts of emulsion, 40 to 60 parts of water, 5 to 10 parts of high-efficiency water reducing agent and 1 to 5 parts of triethanolamine. The mining inorganic environment-friendly reinforcing material provided by the invention is low in reaction heat and is not easy to cause coal combustion.

The invention relates to the technical field of cement mortar compositions, and particularly discloses a double-component anti-freezing early-strength slurry and a preparation method and application thereof. The double-component anti-freezing early-strength slurry provided by the invention is composed of a component A and a component B in a weight ratio of 25: (4-10), the component A is prepared from the following components in parts by weight: 250 to 280 parts of Portland cement, 90 to 100 parts of admixture, 145 to 165 parts of sand and 6.4 to 8.4 parts of water reducing agent; and the component B comprises the following components in parts by weight: 8-10 parts of a sodium nitrite antifreeze agent, 50-58 parts of a reinforcing aid, 32-40 parts of anhydrite, 240-270 parts of an admixture, 155-175 parts of sand and 4.1-6.1 parts of a water reducing agent. By utilizing the technical scheme, the prepared double-component anti-freezing early-strength slurry has the advantages of rapid development of early compressive strength and stable growth of later compressive strength under different ultralow temperature conditions.

The invention provides ground self-leveling mortar based on copper tailing waste residues and a preparation method thereof, and the ground self-leveling mortar comprises the following components: 50 to 150 parts of 0 to 0.045 mm quartz stone powder, 50 to 150 parts of 0 to 0.075 mm copper tailing waste residue powder, 40 to 60 parts of 0.075 to 0.15 mm copper tailing waste residue, 150 to 200 parts of 0.15 to 0.3 mm copper tailing waste residue, 30 to 60 parts of 0.3 to 0.6 mm copper tailing waste residue, 180 to 220 parts of 0.3 to 0.6 mm quartz sand, 230 to 270 parts of P.O42.5 cement, 80 to 120 parts of sulphoaluminate cement and 20 to 40 parts of anhydrite. The concrete is prepared from the following components in parts by weight: 0.8-0.9 part of tartaric acid, 6-8 parts of redispersible latex powder, 0.6-0.8 part of cellulose ether, 0.8-1.0 part of a water reducing agent and 200-240 parts of water. According to the method, the residual tailing waste residues obtained after valuable minerals are recycled from the copper tailings are utilized, the copper tailing waste residues with different grain sizes can be blended to meet the use performance requirements of different ground self-leveling mortar, the process is simple, the production cost is low, all-component resource utilization of the copper tailing waste residues can be achieved, the application range is wide, consumption of natural gravel is reduced, and the production cost is reduced. High-added-value utilization of the copper tailing waste residue powder is achieved, the treatment problem of the copper tailing waste residues is effectively solved, and the environmental and economic benefits are remarkable.

The invention provides ardealite-based self-leveling mortar and a preparation method and application thereof, and belongs to the field of construction.The ardealite-based self-leveling mortar is prepared from, by mass, 75-90 parts of anhydrite, 5-15 parts of in-situ exciting agent, 5-10 parts of chemical exciting agent, 0.06-0.1 part of defoaming agent, 0.06-0.1 part of stabilizer and 0.2-0.4 part of water reducing agent; wherein the anhydrous gypsum is II type anhydrous gypsum with D90 smaller than or equal to 30 m, the stacking density of the II type anhydrous gypsum is 0.5-1.5 g / cm < 3 >, and the oil absorption value is 40-60 ml / 100 g. The anhydrite is synergistically excited through the in-situ exciting agent and the chemical exciting agent, under the assistance of the auxiliary agent, the breaking strength and compressive strength of the self-leveling mortar can be improved, the initial setting time of the self-leveling mortar is longer than or equal to 2 h, the final setting time of the self-leveling mortar is shorter than or equal to 8 h, and the use standard of the building field is met.

The invention relates to the technical field of concrete crack repairing agents, in particular to a triggered precipitation type concrete crack repairing agent as well as a preparation method and application thereof. The repairing agent is prepared from the following raw materials: sulphoaluminate cement, nano anhydrite with a core-shell structure, fluorine-phosphorus composite seed crystal, magnesium oxide, metakaolin and a water reducing agent, wherein the core-shell structure nano anhydrite is prepared by coating mesoporous silica with nano anhydrite, and the fluorine-phosphorus composite seed crystal is prepared from calcium fluoride and monocalcium phosphate through a hydrothermal reaction. According to the trigger precipitation type concrete crack repairing agent prepared by the invention, sulfate ions are slowly released through the core-shell structure nano anhydrite, the crystal form of ettringite is regulated and controlled through the fluorine-phosphorus composite seed crystal, the problems that a traditional repairing agent shrinks and falls off in the later period, the high-temperature strength is suddenly reduced, and the binding power is insufficient are solved, and the trigger precipitation type concrete crack repairing agent is suitable for concrete structure crack repairing and high-temperature environment engineering.

The invention discloses an admixture for low-shrinkage ultra-high performance concrete as well as a preparation method and application of the admixture. The admixture is prepared from the following components in parts by weight: 15 to 18 parts of silica fume, 10 to 15 parts of microbeads, 10 to 15 parts of mineral powder, 0.3 to 0.5 part of a plastic expanding agent, 4 to 6 parts of a calcium expanding agent, 4 to 6 parts of a magnesium expanding agent, 3 to 5 parts of anhydrite, 0.1 to 0.2 part of water-absorbent resin, 0.1 to 0.2 part of a de-foaming agent and 0.5 to 1 part of a water reducing agent. The admixture for the low-shrinkage type ultra-high performance concrete is excellent in adaptability, on one hand, the compressive strength and working performance of different ages can be improved, and on the other hand, the problems that due to the fact that the mixing amount of a traditional ultra-high performance concrete binding material and the using amount of cement are high, the concrete is large in shrinkage and prone to cracking are effectively solved.

The invention discloses a method for preparing anhydrite through ultrasound-assisted phosphogypsum crystal transformation, which is characterized in that phosphogypsum is used as a raw material, ammonium persulfate is used as an additive, a dilute sulfuric acid solution is used as a crystal transformation agent, and the anhydrite is prepared by adopting a sulfuric acid method under ultrasound-assisted action. The process for preparing the anhydrous gypsum has the characteristics of low sulfuric acid concentration, low equipment corrosion degree, low heating temperature, low energy consumption, high whiteness of the product anhydrous gypsum and small particle size.

The invention relates to gypsum-based self-leveling mortar, a preparation method thereof and gypsum-based self-leveling slurry. The gypsum-based self-leveling mortar is prepared from the following raw materials in parts by weight: 580 to 850 parts of desulfurized gypsum clinker, 60 to 180 parts of anhydrite, 120 to 400 parts of filler, 0.5 to 2.5 parts of retarder, 1 to 3 parts of water reducing agent, 0.3 to 0.6 part of defoaming agent, 0.1 to 0.3 part of stabilizer and 0 to 0.3 part of water-retaining agent. The self-leveling mortar provided by the invention has good fluidity, mechanical properties, volume stability, heat-conducting property and the like. The gypsum-based self-leveling floor is cheap in base material and stable and good in performance, and a technical basis is provided for later development of large-scale self-leveling mortar.

The invention belongs to the field of phosphorus chemical industry, and particularly relates to a method for synchronously preparing type II anhydrite in a semi-hydrated-dihydrated wet-process phosphoric acid process and the type II anhydrite. The method comprises the following steps: carrying out slurry premixing, semi-hydrated crystallization, dihydrate conversion and dihydrate filtration to obtain dihydrate gypsum, after the semi-hydrated crystallization step, leading out a part of slurry, adding a lattice orientation agent and a crystal face selective adsorbent into an intermediate pretreatment tank for pretreatment, and adding concentrated sulfuric acid into an anhydrous crystallization reactor for anhydrous crystallization, and finally, carrying out solid-liquid separation, washing and drying to obtain the type II anhydrite. The method is simple in process, energy-saving and environment-friendly, co-production of the phosphoric acid product and the high-added-value II type anhydrous gypsum is realized, and the product yield is gt; therefore, the method has remarkable economic benefits and environmental benefits.

The invention relates to the technical field of concrete, and discloses a concrete anti-cracking agent and a preparation method thereof.The preparation method comprises the steps that 10-15 parts by weight of zeolite powder, 12-16 parts by weight of anhydrite, 2-3 parts by weight of polymethyl methacrylate microspheres, 1-3 parts by weight of cellulose-based polyurethane and 0.4-0.7 part by weight of graphene oxide are added into a stirrer and stirred for 10-16 min, and a mixture is obtained; and finally, obtaining the concrete anti-cracking agent. The concrete anti-cracking agent disclosed by the invention has relatively good anti-cracking and compression-resistant effects.

The invention belongs to the technical field of grouting materials, and particularly relates to a quick-setting early-strength self-stress functional grouting material and an expansibility testing method. The existing cement-based anchoring agent or mine filling body top-contacting agent and fractured rock mass grouting reinforcing agent have the phenomena of poor coupling effect, volume shrinkage and the like. The grouting material is composed of a component A and a component B, the component A mainly comprises sulphoaluminate cement, a water reducing agent, a retarder, a sodium salt accelerator and fibers, and the component B mainly comprises anhydrite, quicklime, a water reducing agent, an early strength agent, aluminum powder, a retarder and fibers. When in use, the mass ratio of the main components of the component A to the component B is (0.85-1.15): 1, and the water-cement ratio is (0.6-1.2): 1. When the water cement ratio is low (0.6-0.8: 1), the material can be used as an anchoring agent of an anchor rod; when the water-cement ratio is high (0.8-1.2): 1, the grouting agent can be used as a mine filling body top-contacting agent and a fractured rock mass grouting reinforcing agent; the invention further provides a simple testing method for the volume expansion rate and the expansion stress. And the method has obvious engineering application value.

The invention relates to the technical field of concrete crack repairing, and particularly discloses a quick-hardening concrete crack repairing agent and a preparation method thereof. The invention relates to a quick-hardening concrete crack repairing agent, which is prepared from the following raw materials: 45 to 55 parts of sulphoaluminate cement; 10 to 15 parts of silica fume; 12 to 18 parts of metakaolin; 5-8 parts of a bimetallic composite seed crystal; 10 to 15 parts of double-layer shell nano anhydrite; 2-4 parts of magnesium oxide; 0.5 to 1 part of polypropylene fiber; 0.5 to 0.8 part of a water reducing agent; 15 to 20 parts of water; the bimetallic composite seed crystal is a zirconium and strontium element co-doped composite crystal nucleus; the double-shell nano anhydrite is composed of an inner core nano anhydrite, a middle aluminum sulfate early strength phase and an outer mesoporous SiO2 shell. The quick-hardening concrete crack repairing agent has the advantages of being short in setting time, high in early strength and excellent in interface bonding performance.

The invention discloses a modified slag sulphoaluminate cement-based ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of concrete. The modified slag sulphoaluminate cement-based ultra-high performance concrete comprises the following raw material components in parts by weight: 36 to 108 parts of sulphoaluminate cement, 24 to 72 parts of ordinary Portland cement, 720 to 924 parts of activated granulated blast furnace slag powder, 216 to 300 parts of anhydrite, 1200 to 1320 parts of quartz sand, 12 to 36 parts of nano-alumina, 9.6 to 24 parts of rare earth polycarboxylate water reducer, 13 to 28 parts of nano-SiO2 combined with silane coupling agent modified polyoxymethylene fiber, and 192 to 240 parts of water. The invention has the advantages of low hydration heat, low shrinkage, high early strength, stable late strength, etc., and can provide technical support for the further application and promotion of ultra-high performance concrete.

The invention belongs to the technical field of concrete, and particularly relates to II-type anhydrous gypsum premixed concrete and a preparation method thereof. The II-type anhydrous gypsum premixed concrete is prepared from the following raw materials in parts by weight: 25 to 28 parts of II anhydrous gypsum, 5 to 7 parts of semi-hydrated gypsum powder, 1.2 to 1.6 parts of calcium silicate, 0.2 to 0.5 part of an additive, 7 to 11 parts of water, 29 to 35 parts of gravel and 28 to 32 parts of mountain sand. The use amount of phosphogypsum is up to 95% or above, and the setting time is controllable and easy to adjust. The coating has the properties of high early strength, wear resistance, corrosion resistance and the like.

The invention provides a method and a device for determining spatio-temporal evolution of clastic rock diagenetic fluid in a fractured basin. The method for determining spatio-temporal evolution of clastic rock diagenetic fluid in the fractured basin comprises the following steps: acquiring authigenic minerals at different structural positions of the fractured basin; wherein the authigenic minerals comprise carbonate, quartz secondary enlargement and anhydrite; determining the paleofluid temperature of the authigenic mineral according to the uniform temperature of the saline inclusion of the authigenic mineral and the uniform temperature of the hydrocarbon inclusion; and determining the spatio-temporal evolution process of the clastic rock diagenetic fluid of the broken basin according to the paleo-fluid temperature, the predetermined burying history of the broken basin and the paleo-ground temperature gradient. According to the method, the activity time range of diagenesis fluid in clastic rock reservoirs at different structural positions is determined, so that fluid difference evolution modes of different structural positions of the broken lake basin are established, and technical support is finally provided for predicting causes of high-quality clastic rock reservoirs.

The invention relates to the technical field of building materials, and particularly discloses high-strength premixed pervious concrete for a surface layer and a preparation method of the high-strength premixed pervious concrete. The invention relates to high-strength premixed pervious concrete for a surface layer. The concrete comprises the following components in parts by weight: 220 to 300 parts of cement, 1570 to 1720 parts of double-graded broken stone, 85 to 120 parts of water, 50 to 100 parts of mineral powder, 18 to 35 parts of anhydrite, 4 to 10 parts of soluble sulfate, 0 to 50 parts of silica fume, 0 to 50 parts of fly ash of 1000 meshes, 20 to 35 parts of quartz stone fine sand of 80 to 120 meshes, 1 to 2.5 parts of a composite water reducing agent, 0.4 to 2.4 parts of a viscosity modifier, 6 to 10 parts of wollastonite fiber powder and 0.4 to 1 part of a defoaming agent. The composite water reducing agent comprises an ether polycarboxylic acid water reducing agent and an ester polycarboxylic acid water reducing agent. The composition and proportion of the concrete are designed and adjusted, so that the concrete has a good construction effect under the premixing condition.

The invention relates to a preparation method of type II anhydrous gypsum. The preparation method comprises the following steps: mixing an industrial by-product gypsum raw material with type II anhydrous gypsum seed crystal to obtain a mixture; autoclaving the mixture at the temperature of lower than 200 DEG C to obtain intermediate powder; and drying the intermediate powder at a drying temperature lower than the autoclaved temperature to obtain the type II anhydrite. According to the preparation method, high-temperature calcination or addition of an inducer and a catalyst is not needed, no acidic raw material is added, and the preparation method has the characteristics of low energy consumption, environment optimization and high conversion rate.

Manufacturing lightweight aggregate (LWA) by a sintering technique requires a delicate balance among three conditions: forming sufficient amount of molten liquid phase during sintering; reaching an appropriate viscosity for solid-liquid suspension; and emitting sufficient amount of gas that can be entrapped by the liquid phase to form pores. LWAs were made from low-calcium and high-calcium Waste Coal Combustion Ash (W-CCA) including fly ash and bottom ash. A mass fraction of at least 40% liquid phase for fly ash and 50% for bottom ash is required for a successful entrapment of emitted gaseous phases during sintering. Larger pores were observed in the microstructure of LWA samples made using high-calcium W-CCA in comparison to low-calcium W-CCA. This result was mainly attributed to the high-calcium samples forming liquid phases with lower viscosity values and emitting higher amounts of gaseous phase during sintering than did the low-calcium samples. The gaseous phase was generated by hematite reduction and anhydrite decomposition.

The invention discloses a calcining furnace for large-scale production of type II anhydrite from industrial byproduct gypsum, which is characterized in that a plurality of material inlets are formed in the calcining furnace and used for receiving materials from different sources, so that the fine powder circulation volume in a system is greatly reduced, and dust collection return materials directly enter the lower part of the calcining furnace, so that the productivity of the system is increased; the air inlet part of the calcining furnace adopts high-temperature flue gas, part of heat energy is recycled, and the use of air can be reduced, so that the oxygen content in the calcining furnace is always below the explosion limit, and the safety is improved; by means of temperature, pressure, oxygen content, air volume and other instruments, frequency conversion fan rotating speed, valve opening and the like, automatic control is adopted, and raw material amount, fuel consumption and mixed total air volume entering a calcining furnace are metered and controlled, so that the system has the advantages of reducing total air volume of the system, reducing total air displacement, reducing heat consumption, saving energy, improving heat exchange efficiency, improving effective utilization rate of energy, improving productivity and the like. And the product quality is improved.

The invention belongs to the field of building materials, and particularly relates to an anhydrous gypsum-based terrazzo floor material and a preparation method thereof. The anhydrite-based terrazzo floor material is prepared from the following raw materials: anhydrite, quenched stone, building gypsum, ash calcium, potassium sulfate, calcium formate, a water reducing agent, a defoaming agent, rubber powder and hydroxypropyl methyl cellulose. The invention relates to a building material, which is prepared from the following raw materials in parts by weight: 525 to 550 parts of anhydrite, 350 to 450 parts of quenched stone, 30 to 40 parts of building gypsum, 15 to 20 parts of ash calcium, 4 to 7 parts of potassium sulfate, 0.5 to 0.8 part of potassium acid calcium, 1.5 to 2.0 parts of water reducing agent, 0.4 to 0.6 part of defoaming agent, 0.10 to 0.15 part of hydroxypropyl methyl cellulose and 6 to 8 parts of rubber powder. The anhydrous gypsum-based terrazzo floor material is high in early strength and low in cost compared with a cement-based inorganic terrazzo in a construction period. The development of companies is facilitated, and the product is more competitive in the market.

The application provides a method for testing gypsum moisture content based on nuclear magnetic resonance, comprising the following steps: performing nuclear magnetic resonance test on a gypsum sample to be tested to obtain a nuclear magnetic resonance signal amplitude; the magnetic field strength of the nuclear magnetic resonance test is less than or equal to 1T; obtaining the mass of water in the gypsum sample according to a predetermined standard curve and the signal amplitude; obtaining the gypsum moisture content according to the mass of water in the gypsum sample and the mass of the gypsum sample to be tested; and the predetermined standard curve is a linear relationship curve of the mass of water in the gypsum and the signal amplitude. The application adopts a low-field nuclear magnetic resonance method (magnetic field strength less than or equal to 1T) to non-destructively determine the water content in the gypsum, thereby determining the type of the gypsum (anhydrite, hemihydrate gypsum and dihydrate gypsum). The method provided by the application does not need to dry the gypsum sample to be tested, has the advantages of rapidness and non-destructiveness, and has a wide application prospect in the determination of water content in the gypsum field and the determination of different types of gypsum.

The invention discloses high-temperature phase change regulation and control anhydrite-based self-leveling mortar and a preparation method thereof. The self-leveling mortar is prepared from Portland cement, sulfur aluminum cement, modified fine sand, modified coarse sand, modified heavy calcium carbonate, ash calcium, anhydrite, cellulose, a water reducing agent, a defoaming agent, rubber powder and lithium sulfate. The preparation method comprises the following steps: S1, carrying out solid phase change on calcined phosphogypsum to prepare anhydrous gypsum, S2, preparing modified fine sand and modified coarse sand, S3, preparing modified coarse calcium carbonate, and S4, mixing all the components to obtain the anhydrous gypsum-based self-leveling mortar. Through the synergistic effect of all the raw materials, the modified fine sand, the modified coarse sand and the modified coarse calcium carbonate form a tight filling structure, the structural strength of the dried mortar is enhanced, in the alkaline environment of the self-leveling mortar, polyethylene glycol monomethyl ether on the surface of the modified coarse calcium carbonate reacts with silane coupling agents on the surfaces of the modified fine sand and the modified coarse sand to form a cross-linked structure, and the self-leveling mortar has the advantages that the self-leveling effect is good; the structural strength and the stability of the self-leveling mortar are further improved.

The invention relates to a process for the industrial production of artificial anhydrite using a microwave oven (2) equipped with: - a heating element (4), - at least one microwave generator (24a, 24b) and at least one waveguide (22) extending in a longitudinal direction inside the heating element (4), the process comprising the following steps: a) hydrated calcium sulfate is introduced into the heating element (4), b) the hydrated calcium sulfate introduced into the heating element (4) is exposed to microwaves emitted by said at least one microwave generator (24a, 24b) and carried into the heating element (4) by said at least one waveguide (22), so as to dehydrate at least a part of the hydrated calcium sulfate introduced and produce an artificial anhydrite, c) the artificial anhydrite produced is extracted from the heating element (4). Figure for the summary: Fig. 2

The invention relates to a system for flash production of anhydrite from phosphogypsum. The system comprises a chimney, an induced draft fan, a bag collector and a vertical cylinder furnace, the vertical cylinder furnace is composed of a furnace body, a furnace cover, a furnace bottom and a material scattering device. The furnace body comprises a green electric heating body, a heat insulation material and a furnace body shell. The green electricity is used as an energy source, the anhydrous gypsum is produced by adopting a vertical suspension calcination technology, and the carbon neutralization of the anhydrous gypsum industry is favorably realized.

The invention provides a method for preparing anhydrous gypsum through phosphogypsum crystal transformation and purification, and relates to the technical field of industrial solid waste recycling. The method comprises the following steps: uniformly mixing the phosphogypsum, the acidic mixed solution and the crystal modifier, reacting under specific conditions, and filtering while hot after the reaction is finished, thereby obtaining the anhydrous gypsum. According to the technical scheme, the growth process of the anhydrous gypsum is regulated and controlled by introducing the specific crystal modifier, so that the anhydrous gypsum with high purity and high compressive strength is obtained. The method is suitable for preparing the anhydrite by taking the industrial byproduct phosphogypsum with high phosphorus impurity content as the raw material, the produced anhydrite is good in crystallization conversion, excellent in product quality, simple in process, high in efficiency and low in energy consumption, the water demand is lower than that of a traditional method, the phosphogypsum waste can be utilized, and resource circulation is realized.

The present invention discloses a method for producing super-grade anhydrite by decomposing calcium chloride and producing hydrochloric acid as a byproduct. The method comprises heating a calcium chloride solution to above 102°C, adding concentrated sulfuric acid for stirring reaction, obtaining a reaction solution containing calcium sulfate precipitation and hydrogen chloride gas; the reaction solution containing calcium sulfate precipitation is subjected to solid-liquid separation to obtain an anhydrous calcium sulfate product and a filtrate containing calcium chloride; the hydrogen chloride gas is absorbed by water to obtain hydrochloric acid. The anhydrous calcium sulfate obtained by the method has high grade and good quality, meets the quality standard of super-grade anhydrite specified in GB / T 5483‑2008, and has a complete crystal structure, no cracks, low surface activity, and is suitable for use as a filler in industries such as plastics, rubber, paint, textiles, and papermaking. The method is simple, easy to operate, and has low production cost, and is suitable for large-scale industrial production of super-grade anhydrite.

The invention discloses a nano C-A-S-H seed crystal and a nano C-A-S-H enhanced low-content high-belite cement-slag cementing material, and belongs to the technical field of building materials. The raw materials of the nano C-A-S-H seed crystal comprise a silicon source, a calcium source, an aluminum source, polycarboxylic acid and alkali and are synthesized by adopting a chemical precipitation method, the Al / Si ratio is 0.5, the Ca / Si ratio is 1.2-2.0, and the water-solid ratio is (8-12): 1. The nano C-A-S-H enhanced low-doping-amount high-belite cement-slag cementing material disclosed by the invention comprises nano C-A-S-H seed crystals and a cementing material, wherein the doping amount of the nano C-A-S-H seed crystals is 1-3wt%; the cementing material comprises granulated blast furnace slag, high belite cement clinker and anhydrite. The nano C-A-S-H seed crystal is creatively doped into the low-doping-amount high-belite cement-slag cementing material, so that the early strength and construction efficiency of the material are remarkably improved, continuous increase of the later strength is guaranteed, meanwhile, efficient utilization of the low-doping-amount high-belite cement and the slag is realized, and the low-doping-amount high-belite cement-slag cementing material has excellent performance and environmental protection value.

The invention discloses a preparation method and application of anhydrite-celestite solid solution. A calcium nitrate solution and a strontium nitrate solution are prepared into a mixed solution according to different proportions, and a sodium sulfate solution is used as a precipitator. Strontium-containing gypsum is generated through a coprecipitation method, and after calcination, anhydrite-celestite series solid solutions are obtained. During application, a proper amount of anhydrite-celestite series solid solution is taken and placed in three different aqueous solutions at room temperature to be dissolved, and the distribution rule of the strontium-containing sulfate solid solution in the aqueous solutions is explored. The anhydrite-celestite series solid solution obtained by the method has the advantages of mild reaction conditions, easily available raw materials, high crystallinity and the like. Wherein in the coprecipitation experiment process, the removal rate of strontium in the mixed solution is close to 100%.

A ternary hydraulic binder composition including the mineralogical compound C4A3$ (ye'elimite) and a member selected from the group consisting of gypsum, calcium sulfate hemihydrate, anhydrite and mixtures thereof (collectively named C$Hx with x being a rational number from 0 to 2), and optionally C2S (belite), including an added content of the mineralogical compound C12A7 (dodecacalcium heptaaluminate). Moreover, it suggests a process for the manufacture thereof, a process for the manufacture of a construction chemical composition including water, and the use of the ternary composition in construction chemical compositions including knifing fillers, screeds, and repair mortars, tile adhesives, tiling grouts, plasters, base coats and sealings.

The application discloses anhydrite calcining system and relates to the technical field of gypsum processing. The anhydrite calcining system comprises a calcining assembly and a crushing assembly. A discharging port is arranged on the calcining assembly. A crushing inlet is arranged on the crushing assembly. A ring-shaped support frame is rotatably arranged on the discharging port. A sealing base plate is installed on the ring-shaped support frame through a sealing connecting assembly. Soft pipes are connected to the ring-shaped support frame through a pipeline connecting assembly. The other ends of the soft pipes are connected to the crushing inlet. The crushing assembly and the calcining assembly are connected through the soft pipes. When the calcining is finished and the discharging is performed, the gypsum product obtained from the calcining assembly is guided from the discharging port to the crushing inlet position. The dust in the product is also limited between the soft pipes. In this process, the dust can be prevented from being raised into the air.