343 results about "Lime" patented technology

The invention relates to the technical field of lime shaft kilns, in particular to a full-automatic Kawasaki rotating lime shaft kiln device, and aims to solve the problems that during combustion of an existing lime shaft kiln, due to the fact that flame heat is concentrated on a local part, a disordered and uniform temperature field cannot be formed, and the calcination temperature of limestone is not uniform; limestone processing is achieved through the combustion mechanism on the supporting seat, the soaking assembly in the thermal insulation shell guides materials and cooperates with the combustion assembly for preheating, a flame jet device of the combustion assembly jets flames, the flames act with heating gas blown out by the high-pressure air pump to form a uniform temperature field, and the material guiding plate guides the materials to enter the rotating processing part. And the processing component disperses the materials through the rotating and material uniformizing assembly, so that the limestone is uniformly heated, and the uniform effect during limestone calcination is improved.

The invention discloses a multi-component nano inhibitor for flotation separation of high-argillaceous copper sulphide ore and application, the nano inhibitor is a nano calcium carbonate-calcium oxide-sodium humate coating body, the nano inhibitor is applied to flotation separation of the high-argillaceous copper sulphide ore, collaborative optimization of slime inhibition and copper ore selective collection is achieved, and the flotation separation efficiency of the high-argillaceous copper sulphide ore is improved. And high-quality copper sulfide concentrate and sulfur concentrate are obtained. According to the method, the high specific surface area and the surface activity of the nano particles are utilized, under the weak alkaline environment without desliming, through the simple, convenient, economical and efficient mineral processing technology and reagent combination, efficient recovery of copper, gold and sulfur in the high-argillaceous ore is achieved, the use amount of lime is greatly reduced, and the technical problem of tailing sedimentation is solved.

The invention provides application of sodium 2, 3-dimercaptopropanesulfonate as an inhibitor in low-alkalinity copper-sulfur flotation separation, and relates to the technical field of mineral separation. When the compound serves as an inhibitor, the compound, a collecting agent and a foaming agent are prepared into a composite flotation reagent and used for low-alkalinity flotation separation of chalcopyrite and pyrite, flotation separation is conducted through the steps of one-time roughing, at least one-time scavenging and at least one-time concentration after ore grinding and grading, and copper concentrate is collected; the method can effectively solve the problems that the copper-iron separation effect is poor in the process of flotation separation of the chalcopyrite and the pyrite, the copper recovery rate is low due to addition of a large amount of lime and the like, the chalcopyrite and the pyrite can be efficiently separated under the low-alkalinity condition through the specific flotation process, and the flotation effect on the chalcopyrite is improved.

The invention discloses a waste incineration fly ash treatment device and method, and relates to the technical field of waste treatment.The waste incineration fly ash treatment device comprises a combustion furnace, a TiO2 raw material bin, a waste heat boiler, a first screw extrusion mechanism, a cooling mechanism, a mixing mechanism, a lime and gravel raw material bin, a stabilizer raw material bin, a water storage bin, a second screw extrusion mechanism, a concrete block preparation machine and a supporting frame structure; a material guiding base is installed at the bottom of the inner wall of the combustion furnace, an inclined arc-shaped groove is formed in the top of the material guiding base, a combustor is installed on one side of the combustion furnace, and the fire outlet end of the combustor corresponds to the top of the arc-shaped groove in position. According to the device and the method, the fly ash can be subjected to combustion treatment in a certain temperature environment, chlorine elements in the fly ash are effectively removed, the mode that in the prior art, the chlorine elements in the fly ash are removed in a water washing and acid pickling mode is replaced, the phenomenon that pollutants such as heavy metal migrate from a solid phase to a liquid phase is avoided, and cement solidification operation on the waste incineration fly ash is achieved.

The invention relates to the technical field of building materials, in particular to a cementing material for a fabricated wall prepared from multi-element solid waste and a preparation method of the cementing material. The preparation method comprises the following steps: 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurized gypsum, 3-6 parts of a first mixture, 2-5 parts of a second mixture and 5-8 parts of an alkali activator; the mass ratio of the metakaolin to the bentonite to the superfine calcium carbonate in the first mixture is 3: 2: 1; the mass ratio of the vermiculite to the expanded perlite to the glass beads in the second mixture is 2: 2: 1. Through the synergistic excitation effect of Ca < 2 + > and Na < + > and the addition of the first mixture and the second mixture, the cementing material forms a more stable microstructure. A hydration product SEM figure shows that C-S-H and C (N)-A-S-H gel are symbiotic to form a three-dimensional network, pores are filled with needle-like ettringite crystals, and in combination with the brucite phase anchoring effect, the mechanical properties, such as strength and durability, of the material are remarkably improved.

The invention relates to the technical field of rotary kiln processes, and provides a method for reducing nodulation in a lime rotary kiln, which comprises the following steps: S1, raw material pretreatment; s2, controlling the environment in the kiln; s3, optimizing the structural design of the kiln body; and S4, cleaning and maintaining in the kiln. According to the technical scheme, through the process steps of proportioning the raw materials, calculating the calcining temperature in a kiln, adjusting the stockline of a cooler to be 1.5 m, starting to discharge ash, and ending when the stockline of the cooler is 0.5 m, the CaO range of block ash is reduced by 11.44%, the SiO2 range is reduced by 1.52%, the activity range is reduced by 94.88 ml, the CaO range of surface ash is reduced by 6.95%, the SiO2 range is reduced by 0.54%, and the activity range is reduced by 100 ml; the data verifies that the quality of the finished product ash subjected to multi-fuel combustion in the rotary kiln is relatively stable after the new method is adopted.

The invention discloses a method for producing active lime by calcining limestone, which comprises the following steps of: crushing limestone raw ore, cleaning to remove mud, and removing magnetic components by using a magnet to obtain limestone powder with the particle size of less than 3mm; then adding limestone powder into a 1-2 mol / L sodium hydroxide solution with the weight 3-5 times that of the limestone powder, carrying out ultrasonic oscillation treatment, filtering to obtain a solid I, washing to be neutral, stirring and dispersing in a dispersion liquid, carrying out microwave irradiation under the condition of an alternating magnetic field, and filtering to obtain a solid II, so as to obtain pretreated limestone powder; freezing the pretreated limestone powder under a static magnetic field condition to obtain frozen limestone powder; and finally, mixing and calcining the pretreated limestone powder and carbon dioxide adsorption balls with the particle size of 10-15mm, and separating to remove the carbon dioxide adsorption balls, thereby obtaining the active lime. The obtained active lime is high in calcium oxide content, few in impurities, high in activity degree and good in stability.

Provided herein are processes and systems related to a carbon dioxide sequestration process comprising a) calcining limestone using fossil fuel instead of an input to form a mixture comprising lime and a gas stream comprising greater than about 30 vol% carbon dioxide; and b) treating the mixture comprising lime with the atmosphere and allowing carbon dioxide from the atmosphere to react with the mixture and form a composition comprising calcium carbonate, calcium bicarbonate, or a combination thereof. Also provided herein are processes and systems related to a carbon dioxide sequestration process comprising a) calcining limestone using fossil fuel instead of an input to form a mixture comprising lime and a gas stream comprising greater than about 30 vol% carbon dioxide; and b) treating the mixture comprising lime with natural water and allowing carbon dioxide dissolved in the natural water to react with the mixture to form a composition comprising calcium carbonate, calcium bicarbonate, or a combination thereof.

The present invention relates to the technical field of waste resource utilization, and in particular to a method for recycling perfluorocarbon waste. Perfluorocarbon waste is pre-treated, and then mixed with auxiliary materials at a mass ratio of 1:1-5 for perfluorocarbon waste: auxiliary materials to obtain a solid material to be treated; the solid material to be treated is mixed with cement raw material, and sintered at 1400-1500°C to obtain a clinker as a cement raw material; wherein the physical form of the perfluorocarbon waste is liquid or solid; and the auxiliary materials are selected from at least one of coal powder, quicklime powder, charcoal powder, slaked lime powder and cement clinker powder. The recycling method of the present invention can convert perfluorocarbon waste into primary minerals such as calcium fluoride as components in clinker, with low recycling cost and high efficiency.

The invention relates to the technical field of river sludge solidification, in particular to a river dredging sludge solidification treatment device which comprises a box body, a sludge pipe is fixedly installed on the box body, a mixing assembly is fixedly installed at the end, located in the box body, of the sludge pipe, a solidification assembly is fixedly installed on the box body, and the solidification assembly is located below the mixing assembly; external lime powder enters the lime pipe in an air blowing mode, sequentially passes through the air shell and the particle pipe and enters the uniform distribution pipe, the lime powder is sprayed to the bottom of the mixing tank through the powder nozzles on the surface of the uniform distribution pipe to complete distribution of the lime powder, and then the output end of the distribution motor drives the crankshaft to rotate. The sliding rod drives the abutting plate to move downwards, the abutting plate drives the soft rubber sealing plug to move downwards, the soft rubber sealing plug is separated from the inner wall of the mixing tank, sludge flows in along the inner wall of the mixing tank and makes contact with lime powder at the bottom to be fused, the water content of the sludge is reduced, the sludge is pretreated, and the subsequent chemical curing effect is improved.

The present disclosure provides methods and compositions of building materials for carbon sequestration. The compositions include magnesium oxide or magnesium hydroxide, a lime material comprising a calcium oxide and / or a calcium hydroxide; and a pozzolan comprising at least one material selected from the group consisting of ash (e.g., rice husk, coconut, ceramic), fly ash, vitrified calcium aluminio-silicate, blast furnace slag, ground granulated blast-furnace slag (GGBFS), zeolites, diatomaceous earth, silica fume, amorphous aluminosilicate, glass phase pozzolan, fume silica, metakaolin, calcinated diatomaceous earth, biochar, geopolymers, kaolinitic clays, volcanic ash, silica fume, pozzolanic lime, precipitated silica, carbon nanotubes, calcinated silicate pozzolan, synthetic pozzolan, pozzolan powders (e.g., glass, brick). The disclosure also provides methods for absorbing carbon dioxide using the disclosed building material.

The invention provides a lime-free efficient flotation process for lead-zinc-silver ore, and belongs to the technical field of ore dressing processes. The efficient flotation process solves the problems that in the prior art, the use cost of lime is high, the return water treatment cost needs to be improved, and the product quality needs to be improved. The flotation process provided by the invention has the following effects: the lime consumption is reduced, and the lime cost is saved by about 3 million yuan per year. The product quality is improved, the arsenic impurity content in the zinc concentrate is reduced from 2% to below 0.8%, the economic benefit is improved by about 280,000 yuan per year, the copper grade in the lead concentrate is improved from 1.7% to above 2%, and the economic benefit is improved by about 7,000,000 yuan per year. The pH value in the pond is reduced from 11 to 7, and the surrounding environment of the tailing pond is improved. The Ca < 2 + > concentration in the tailing pond return water is reduced, the pipeline structure influence is reduced, and the production efficiency is improved.

The utility model relates to the technical field of limestone processing, in particular to lime block grinding equipment, which not only can screen lime blocks and crush large lime blocks so as to improve the working efficiency, but also can purge the device after lime powder is discharged so as to avoid waste caused by residual lime powder in the device. Comprising a feeding mechanism; the device further comprises a grinding mechanism, a screening mechanism, a discharging mechanism and a blowing mechanism, the grinding mechanism is installed on the feeding mechanism and grinds lime blocks, the screening mechanism is installed on the grinding mechanism and screens the lime blocks, and the discharging mechanism is installed on the grinding mechanism and accelerates discharging of lime powder. The purging mechanism is installed on the feeding mechanism and purges the interior of the device.

The utility model discloses a desulfurizing tower with a spraying device, which comprises a desulfurizing tower body, all desulfurizing cavities are arranged in the desulfurizing tower body, a spraying mechanism is arranged on the inner side of each desulfurizing cavity, an activated carbon filter plate is fixedly connected with the inner side of each desulfurizing cavity and is positioned above the spraying mechanism, and the spraying device is arranged on the inner side of each activated carbon filter plate. The device has the beneficial effects that the stirring tank, the sludge pump, the material pumping pipeline, the material conveying pipeline, the transverse plate, the lifting rope and the spraying pipeline are arranged, so that lime, limestone powder and water are put into the stirring tank together to be mixed into slurry, then the sludge pump is started, and the slurry is pumped out by utilizing the material pumping pipeline positioned in the stirring tank; then the flue gas is directly conveyed into the spraying pipeline through the conveying pipeline and is sprayed out through the spraying mechanism in the spraying pipeline, and sulfur dioxide in the flue gas, calcium hydroxide in the slurry and air blown in from the lower part of the tower are subjected to oxidation reaction to generate calcium sulfate.

The invention provides a device for detecting calcium oxide in slaked lime and application thereof. The device comprises a display screen, a controller, a reaction container, a temperature probe and an operation panel. The controller is electrically connected with the operation panel, the temperature probe and the display screen. The application method comprises the following steps: calcining calcium oxide at 580 DEG C, putting calcium oxide and calcium hydroxide with gradient concentrations into a reaction container, detecting the temperature by using a temperature probe, and drawing a calcium oxide content standard curve; placing a sample to be detected in the reaction container, recording temperature change data t1, and calculating the corresponding calcium oxide content according to the calcium oxide content standard curve. The influence of calcium hydroxide content detection is eliminated by accurately detecting the calcium oxide content in the slaked lime, so that the accuracy of the calcium hydroxide content detection structure in the slaked lime is ensured, and the problem of high calcium hydroxide content detection data caused by the existence of calcium oxide when the calcium hydroxide content is detected by adopting a sucrose method is avoided.

The invention discloses a combined collecting agent in low-grade copper-molybdenum ore and application of the combined collecting agent, and belongs to the technical field of mineral separation. The method comprises the following steps: firstly, adding lime into raw ore as an inhibitor, grinding the ore, adding kerosene and butyl acrylate (or butyl methacrylate) as a combined collecting agent and a foaming agent, carrying out one-time roughing, two-time concentrating and three-time sweeping operation to obtain copper-molybdenum bulk concentrate, stirring the copper-molybdenum bulk concentrate for reagent removal, and then carrying out copper-molybdenum separation operation; sodium sulfide and sodium thioglycollate are added as inhibitors, and copper concentrate and molybdenum concentrate are obtained after one-time roughing, four-time concentrating and three-time sweeping operation; butyl acrylate (or butyl methacrylate) involved in the method has a foaming effect, kerosene and butyl acrylate (or butyl methacrylate) are used as the combined collecting agent, a foaming agent does not need to be added in the process, the ore dressing cost is reduced, and meanwhile efficient recovery of copper-molybdenum minerals is achieved.

The invention provides a low-nitrogen combustion decomposing furnace and a lime calcining system, and belongs to the technical field of limestone calcining, specifically, the low-nitrogen combustion decomposing furnace comprises a decomposing furnace body used for calcining and decomposing limestone, and a furnace chamber of the decomposing furnace body is divided into a material collecting area, a hot carbon reduction area and a combustion decomposing area; materials, combustion-supporting gas and fuel enter the decomposing furnace body in two ways, and the proportion of the materials, the combustion-supporting gas and the fuel entering the decomposing furnace body in the two ways is controlled, so that a hot carbon reduction area and a combustion decomposing area are formed in a furnace cavity of the decomposing furnace body. For example, the proportion of combustion-supporting gas in the combustion decomposition area is more, so that materials can be fully combusted, while the proportion of the combustion-supporting gas in the hot carbon reduction area can be reduced, so that insufficient combustion is carried out in the area, and meanwhile, suppression and reduction are carried out through fuel, so that nitrogen oxide passing through the area is subjected to reduction reaction to become carbon dioxide and nitrogen to be discharged; the content of nitrogen oxide is greatly reduced, and the nitrogen oxide treatment procedure of the subsequent exhaust process is reduced.

The invention discloses a method for preparing a cementing material from tailings, and relates to the technical field of comprehensive utilization of mine tailings, and the method comprises the following steps: S1, classifying the tailings into fine tailings and coarse tailings; s2, iron impurities are removed from the fine tailings, and the fine tailings are ground to obtain tailing micro powder; s3, the coarse tailings are subjected to low-intensity magnetic separation, high-intensity magnetic separation and flotation, and feldspar is obtained; s4, calcining and grinding feldspar to obtain feldspar powder; s5, uniformly mixing feldspar powder, tailing micro powder, gypsum and slaked lime to obtain a mixture; s6, mixing water glass, NaOH and water to prepare an alkali activator solution; and S7, adding the alkali activator solution into the mixture, intensely stirring, and carrying out medium-temperature maintenance to obtain the cementing material. According to the method, the tailings are subjected to grading treatment, the fine tailings and the rough tailings are subjected to targeted processing, mineral components of the tailings are fully utilized, the comprehensive utilization rate of the tailings is remarkably increased, and accumulation of the tailings is reduced.

The invention provides a comprehensive analysis method for compaction quality of a lime treated soft soil roadbed based on intelligent compaction. The method comprises the following steps: S1, acquiring vibration modulus data corresponding to a plurality of detection units respectively; s2, calculating a compaction degree passing rate and a stability passing rate based on the vibration modulus data corresponding to the plurality of detection units, obtaining a uniformity passing rate by adopting a multi-scale variation structure analysis method, and calculating an abnormal aggregation index through a DBSCAN clustering algorithm; s3, determining the weight of each index, wherein the weight comprises the weight of the compaction degree passing rate, the weight of the uniformity passing rate and the weight of the stability passing rate; s4, calculating a compaction quality value based on each index and the corresponding weight; s5, the roadbed compaction quality grade is judged based on the compaction quality value, and roadbed repairing is conducted based on the roadbed compaction quality grade and the abnormal aggregation index. Compared with the prior art, the method has the advantages of improving the spatial resolution and defect identification precision of uniformity detection of the roadbed compactness and the like.

The utility model relates to the technical field of lime powder processing impurity removing devices, in particular to a lime powder processing impurity removing device which is characterized in that iron ore in lime is adsorbed by starting a magnetic attraction mechanism in the lime conveying process and discharged, lime powder is discharged into a screening mechanism, and the screening mechanism is used for screening the lime powder. The auxiliary mechanism and the screening mechanism are started to be matched to screen the lime powder, and the auxiliary mechanism adsorbs scrap iron in the lime powder and discharges the scrap iron, so that the practicability of the equipment is improved; comprising a crushing mechanism; the crushing mechanism and the magnetic attraction mechanism are installed above the conveying mechanism, the magnetic attraction mechanism is located on the right side of the crushing mechanism, the rolling mechanism is located on the right side of the conveying mechanism, the rolling mechanism is installed at the top end of the screening mechanism, and the auxiliary mechanism is installed at the top end of the screening mechanism; the auxiliary mechanism is located on the right side of the rolling mechanism.

The present invention provides a production method for reducing the incidence of edge cracks of Q235 wide and thick slabs, comprising the following steps: (1) converter smelting, with an iron-steel ratio of 850 kg / t, and adding silicon-manganese alloy and ferrosilicon weak deoxidation during the steel tapping process; (2) adding fluorite, lime, calcium carbide, and Taiwan aluminum to LF for strong stirring to promote sufficient pre-melting of the slag, diffusion deoxidation, and then power supply to form white slag, with the LF outlet composition controlled as follows: C: 0.15-0.18%, Si: 0.15-0.30%, Mn: 0.55-0.65%, P≤0.035%, ALs: 0.007-0.015%, S≤0.010%; (3) continuous casting process :A. The cross-section of the slab casting machine is 300mm×2200mm, and the casting speed is 0.80m / min; B. An immersion nozzle with an outlet inclination angle of 12°, an area of ​​4500 square millimeters, and an insertion depth of 110-140mm is adopted; C. Low melting point, low alkalinity, and low viscosity mold slag is used to slow down heat transfer; D. Weak cooling is adopted for secondary cooling water distribution; E. The side taper of the crystallizer is 1.2%; F. The sum of the inner and outer arcs of the wide surface taper of the crystallizer is controlled at 1.6-2.4mm, and the inner and outer arcs are both controlled at 0.8-1.2mm. The method of the present invention can reduce the incidence of subcutaneous cracks on the edge of Q235 wide and thick slabs to below 1%.

The present application relates to the technical field of building materials, in particular to a thermodynamic modified material for grotto rock mass fissure grouting and a preparation method thereof, which comprises the following components in a mass ratio: lime-based material 100-200 parts; quartz sand 30-50 parts; metakaolin 30-70 parts; calcium aluminate expansive agent 10-20 parts.The present application has the advantages of optimized thermal conductivity, controlled thermal expansion coefficient, improved microstructure and comprehensive performance.The thermal conductivity of the lime-based grouting material is higher than that of traditional tung oil materials, reducing thermal stress concentration caused by temperature gradient;the thermal expansion coefficient can be changed from negative to positive by adjusting the water-cement ratio and the amount of expansive agent, and tends to be close to the limestone rock mass, reducing the risk of interface peeling;the optimized material has higher crystallinity and denser structure, reducing microfissures and improving heat conduction efficiency;while maintaining high mechanical strength and durability, the material realizes directional modification of thermodynamic properties, providing technical support for long-term preservation of grottoes.

The invention provides a light-transmitting brick based on a low-temperature light burning process and a preparation method thereof, and the method comprises the following steps: according to a formula of a ceramic body, mixing Danshan sand, high-whiteness water mill tailings, lime particles, high alumina and barium carbonate, adding water, and carrying out ball milling to obtain barren slurry; carrying out spray granulation on the barren slurry to obtain barren powder, and calcining the barren powder in a preset low-temperature range to obtain a semi-finished product of a light calcined material; grinding the light calcined material semi-finished product to obtain light calcined material powder; mixing rubbed stone mud and ultra-white mud according to a formula of a ceramic green body, then performing slurrying to obtain slurry, mixing the light calcined material powder with the slurry, and then performing ball milling to obtain green body slurry; granulating the green body slurry to obtain green body powder, and treating the green body powder to obtain the light-transmitting brick. According to the invention, the light transmission performance, the firing yield and the product strength of the green body are improved, and the deformation rate during later high-temperature firing is reduced.

The present invention discloses a method for decomposing the response area of a number sequence of a spray gun elbow pipe in a process of matching lime powder pelletizing with airtight conveying of pulverized coal. There are a variable-diameter fastening groove on the operating platform, a sliding clamp group, and a low-speed ring chain electric hoist. According to the need of variable-diameter bending, several areas are set in the arc part. The arc part of the operating platform is decomposed into areas Ⅰ, Ⅱ, Ⅲ, Ⅳ... The number of data points contained in each sub-area is 100. The closer the number of radii of the arc is, the more precise the bending of the elbow pipe workpiece is, and the closer it is to the size required by the entity. According to the accuracy and the need of variable-diameter bending of the elbow pipe workpiece, a sample radius library of RⅠ, RRⅠ... is set. The above sampling radius library is imported into the general term formula of the arithmetic sequence in step 1: RⅠ = R1 + (n - 1)dⅠ, and so on. The arc sub-area RⅡn at different positions can be calculated. According to this, the sizes of the variable-diameter fastening groove on the operating platform and the sliding clamp group are set and rounded to two decimal places, ensuring the accuracy. At the same time, a queryable database is established, and multiple memory productions can be carried out.

The application relates to an aerated concrete prepared from granite waste rock powder and a preparation method thereof. The aerated concrete of the application takes granite waste rock powder (skeleton effect), calcium carbide slag (calcic material), clay (sintering promotion), red mud (gel filling) and coal gangue (siliceous material) as core raw materials, replaces traditional natural sandstone and lime, realizes industrial solid waste resource utilization, conforms to the development direction of green building materials, and significantly reduces the dependence on natural resources.

The application discloses a device and a production method for producing low-sulfur and low-chlorine lime powder by calcining limestone powder, and belongs to the field of limestone powder production and steelmaking. The decomposition furnace is divided into a high-temperature oxygen-deficient combustion region, a first limestone decomposition region and a second limestone decomposition region. A high-temperature oxygen-deficient CaO-free environment is created in the high-temperature oxygen-deficient combustion region, so as to promote the volatilization of residual KCl and NaCl, and then the residual KCl and NaCl are discharged through bypass air release technology. Limestone is added in the first decomposition region for decomposition, and combustion-supporting air is added in the second limestone decomposition region for strengthening combustion effect. In this way, the decomposition rate of limestone can be improved, the quality of steelmaking lime can be improved, and the steelmaking cost can be reduced.

The purpose of the present invention is to provide: an expandable composition which has a satisfactory expansion rate and can improve bending strength; and an expandable admixture. This expandable composition contains free lime crystal particles having an average crystal particle diameter of 1-30 μm. The content of the free lime crystal particles is preferably 15 mass% or more. Furthermore, the expandable composition preferably comprises the free lime crystal particles and heterophases present between the free lime crystal particles. The heterophases preferably include one or more types selected from the group consisting of ternesite, gehlenite, gypsum, ye'elimite and calcium silicate. In addition, the expandable admixture contains anhydrous gypsum and the expandable composition.

The invention discloses a process and effect evaluation method for a top section of a modified Ordovician limestone confined aquifer, and the method comprises the steps: analyzing, studying and judging the hydrogeological conditions of a mine, analyzing the water disaster factors of a treatment range or region, and calculating a water inrush coefficient, so as to facilitate the arrangement of a scheme; a water-bearing layer of the project is thoroughly modified into a water-resisting layer, so that the laneway project located at the layer is in a water-free state; a full-coverage three-dimensional arrangement mode that multiple layers of horizontal holes and top-lifting layer-penetrating holes are combined is adopted, an upper layer and a lower layer are staggered and distributed in a plum blossom shape, drilled holes are formed in multiple layers in a three-dimensional mode, and multiple layers of bedding horizontal holes and layer-penetrating inclined holes are formed in a combined mode. The technical method and route for modifying the top layer of the high-pressure-bearing Ordovician aquifer into the water-resisting layer through full-space complete grouting are achieved, the production technical problem is solved, and the domestic technical blank is filled up.

The invention provides a preparation method of goethite-boron complex minerals for soil improvement, and belongs to the technical field of preparation of artificial minerals for soil improvement, the preparation method comprises the following steps: 1, mixing solutions; 2, stirring the mixed solution; 3, dropwise adding a sodium hydroxide solution; step 4, centrifugal washing; 5, drying the precipitate; and 6, grinding and screening. According to the goethite-boron composite artificial mineral prepared through the method, the boron loss rate is reduced, the boron slow release performance is improved, the ecological environment effect is improved, the boron fertilizer utilization efficiency is improved, iron nutrition is synchronously provided, and the iron deficiency symptom of calcareous soil is relieved.

The application provides a heat transfer device of a heavy ash powder flow cooling alkali machine, which comprises a screw rod and a blade, the inner cavity of the blade is communicated with the inner cavity of the screw rod, a pipe fitting is arranged on the blade, and movable blocks are screwed into the two ends of the pipe fitting. The application can change the contact area between the inner wall of the two ends of the pipe fitting and the material by changing the screwing depth of the movable blocks in the pipe fitting, so that the heat exchange efficiency can be further improved.