380 results about "Bulk density" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

The invention relates to the technical field of control systems, and particularly discloses a crushed material drying system and an operation method thereof, and the crushed material drying system comprises a data acquisition module, a multi-source data fusion module, a dynamic shunting decision module, a cooperative control module and a tail gas treatment optimization module. The data acquisition module acquires particle size distribution, moisture content, stacking density and dust concentration data of materials in real time through a laser scattering type particle size analyzer and a microwave moisture sensor, and transmits the data to the multi-source data fusion module through a Modbus protocol; according to the operation method, through an abnormal working condition grading alarm mechanism, a genetic algorithm optimization fuzzy rule base and multi-module data linkage, the problems of local overheating and low energy efficiency caused by parameter mismatch in traditional control are solved, and global optimization of drying efficiency, energy consumption and operation stability is achieved.

The utility model relates to a mineral powder production system which comprises a first raw material bin and a second raw material bin, the first raw material bin is connected with a raw material weighing feeder, the discharging end of the raw material weighing feeder is connected with a chute, and the chute is connected with a grinding machine; the second raw material bin is connected with a crusher, the crusher is connected with a powder concentrator, a coarse powder bin and a fine powder bin are arranged at the downstream of the powder concentrator, powder in the fine powder bin is stirred by adding water through a first kneading machine, and superfine powder is obtained after stirring and fine grinding; the powder in the coarse powder bin is mixed and stirred with the superfine powder through the second kneading machine, and the mixed powder obtained after mixing and stirring is conveyed to the chute, mixed with the raw material powder and then introduced into the grinding machine. The particle composition state of the powder can be improved, the particle size distribution of the powder is obviously changed, the peak width on a particle size distribution diagram is widened, the peak height on the particle size distribution diagram is reduced, the level difference is increased, and higher bulk density is achieved.

The invention relates to the technical field of soil improvement, in particular to a saline-alkali soil improvement method which comprises the steps of dividing a to-be-improved saline-alkali soil area, detecting the saline-alkali distribution depth of the area and determining the ploughing depth by combining the depth of a target plant root system. Adjusting parameters of the ploughing device according to the difference between the depth and the soil permeability coefficient; setting initial leaching water pressure according to the ploughing parameters, detecting the concentration of sodium ions in discharged water, and adjusting the pressure according to the change curve of the period; when the slope of the curve reaches a preset value, measuring the proportion of sodium ions adsorbed by soil colloid, and comparing the proportion with a standard interval to judge whether continuous spraying is carried out or not. Whether the soil bulk density is detected or not is determined according to the result, ploughing parameters are fed back and adjusted according to the bulk density result, and the improvement requirement is met. According to the method, the ploughing parameters are adjusted through the target ploughing depth and the soil permeability coefficient difference value, and the leaching water pressure is adjusted according to the sodium ion change curve, so that the sodium ion removal efficiency is improved, and then the subsequent improvement efficiency of the saline-alkali soil is improved.

The invention discloses a device and a method for preparing a negative carbon cementing material by a wind power suspension semi-dry method, and belongs to the technical field of comprehensive utilization of solid waste resources. The method for preparing the negative carbon cementing material comprises the following steps: keeping the humidity and CO2 concentration of a reaction system, and carbonizing the wet steel slag micro-powder in the reaction system while the wet steel slag micro-powder is in a suspended state under the action of wind power, so as to obtain the negative carbon cementing material. The CO2 storage rate of the prepared negative carbon cementing material is equivalent to that of wet carbonization, the CO2 storage rate of the negative carbon cementing material is 8-12%, and the bulk density is 1.05-1.2 g / cm < 3 >. In the preparation process, the water resource consumption is extremely low, no wastewater is discharged, and water resource waste and wastewater discharge pollution are avoided.

The invention provides a soil health evaluation method. The method comprises the following steps: acquiring community characteristics of soil arthropods of to-be-evaluated soil; the soil arthropods are selected from at least one of diptera arthropods, arthropods of arachnids, coleoptera arthropods, hymenoptera arthropods and lepidoptera arthropods; the community characteristics comprise species composition and relative abundance of species; predicting soil indexes according to the community characteristics; the soil index is selected from at least one of a soil physicochemical index, a soil degradation index and a soil health index; the soil physical and chemical indexes are soil pH, soil total carbon, soil organic carbon and soil total nitrogen; the soil degradation indexes comprise a soil pH degradation index, a soil total carbon degradation index, a soil organic carbon degradation index and a soil total nitrogen degradation index; the soil health index is determined based on soil pH, soil microbial biomass nitrogen, soil respiration rate, soil total carbon, soil organic carbon, soil total nitrogen and soil bulk density; and performing soil health evaluation based on the soil indexes.

The invention provides a water-retaining material as well as a preparation method and application thereof, and finds that corn glume has extremely high water absorption rate and can be used as an excellent water-retaining material. The glume is obtained by crushing corncobs and then carrying out winnowing and gradient sieving, and the particle size is 2-3mm. In order to effectively utilize the material, the obtained corn glume, a binder, an expanding agent and water are mixed and granulated to prepare water-retaining agent particles, and the water-retaining agent particles are easy and convenient to apply, high in water-retaining capacity and capable of effectively improving the water-retaining capacity of soil and improving the temperature, humidity, conductivity and bulk density of the soil; therefore, the method has important commercial value for soil and land improvement.

The invention relates to the technical field of saline-alkali soil improvement, in particular to a compound conditioner for treating sulfate type saline-alkali soil and application of the compound conditioner. The compound conditioner is formed by compounding hydrotalcite, acidic zeolite and humic acid; wherein the hydrotalcite is nitrate intercalated MgAl-LDH or MgFe-LDH, and the molar ratio of divalent metal ions to trivalent metal ions of the hydrotalcite is (2: 1)-(4: 1); the acidic zeolite is clinoptilolite treated by a nitric acid solution; the humic acid is mineral source humic acid, and the purity of the humic acid is greater than 80%. The compound conditioner disclosed by the invention can mineralize Na < + > and SO4 < 2-> which are too high in content in saline-alkali soil, reduce the salt content and pH and prevent plants from osmotic stress and alkaline toxicity; the content of nitrate nitrogen and organic matters in soil is increased, and nutrient substances are provided for plants; the soil structure is improved, the water-retaining property and the air permeability are enhanced, the soil bulk density is reduced, and plant germination and root growth are facilitated.

The invention discloses a crop planting substrate for promoting rhizome system development and a preparation method thereof. The substrate comprises the following components by volume ratio: 10-20% of straw biogas residue; 50-60% of peat; 15 to 25% of vermiculite; 15 to 25% of perlite; wherein the substrate further comprises a functional additive, and the functional additive is selected from one or more of potassium fulvate, chitosan or plant growth promoting flora. The crop planting substrate provided by the invention significantly promotes the development of rhizome systems through the synergistic effect of the organic-inorganic composite system and the functional additive. The layered structure design optimizes the slow-release effect of water and fertilizer, the water-absorbent resin enhances the water-retaining property, the slow-release fertilizer particles provide continuous nutrients, and the pH regulator maintains a suitable acid-base environment. Compared with a traditional substrate, the volume weight, the total porosity and the gas-water ratio of the substrate are more suitable for root growth, and the substrate is especially suitable for seedling raising of crops such as rice and traditional Chinese medicinal materials.

The invention relates to the technical field of soil physical parameter in-situ measurement, and discloses a soil layer natural water content portable intelligent measuring instrument based on multi-source sensing fusion, which comprises a composite probe assembly and an intelligent measurement and control host which are physically connected, the composite probe assembly is configured to be inserted into a soil layer to be tested to construct a multi-physical field test environment, and an electrical transceiving unit and an acoustic transceiving unit are integrated in the composite probe assembly. By constructing a cross physical field excitation and multiphase parameter collaborative decoupling mechanism, a multidimensional dynamic correlation model is established by using the thermosensitive drift characteristic of the sound velocity of a mixed medium during thermal disturbance and the transient step response of a dielectric constant under an acoustic radiation force field; the problems that the coupling influence of the water content and the volume weight cannot be distinguished and the conductivity of bound water and the conductivity of free water are difficult to separate in a traditional means are effectively solved, and four independent physical quantities including the volumetric water content, the in-situ dry volume weight, the bound water content and the actual conductivity of pore water are synchronously inverted through a single probe. And the decoupling precision of the equipment on complex multi-phase soil medium parameters is improved.

The invention discloses a method for synergistically preparing a carbon-based soil conditioner from coal gangue and straw, and relates to a method for preparing the carbon-based soil conditioner. The invention aims to solve the technical problem that a large amount of coal gangue and agricultural straws are accumulated as wastes in the prior art to cause harm to the environment. The preparation method comprises the following steps: firstly, carrying out ultramicro activation pretreatment on coal gangue through mechanical grinding; then, adopting a double-atmosphere segmented pyrolysis process: generating a plant ash silicon fertilizer rich in KCl and K2CO3 in an air atmosphere; preparing a biochar material with a hierarchical porous structure under the protection of nitrogen; accurate compounding of the activated silicon fertilizer and the porous biochar is achieved through solid-phase mixing, finally, the activated silicon fertilizer and the porous biochar cooperate with the vinegar residue organic material to form the organic-inorganic composite carbon-based soil conditioner, the soil conditioner has the weakly acidic pH regulation and control function, the mineral nutrition slow release characteristic and the multi-scale pore structure characteristic, formation of saline-alkali soil aggregates is effectively promoted, the soil structure is improved, and the soil quality is improved. The volume weight of soil is reduced, and the effectiveness of phosphorus and the bioavailability of silicon are remarkably improved.

The invention provides a method for improving land through cooperation of coal-based solid waste and agricultural waste, and belongs to the technical field of solid waste reutilization. According to the method, coal gangue and other solid waste are used as main raw materials, different application modes are provided for mine area land restoration and desertification land improvement, the scientific, reasonable, economical and safe ecological restoration mode is adopted, the requirements for mine area land desertification and ecological restoration of a mine area are met, and the method is suitable for popularization and application. And a feasible solution is provided for regions taking coal-based industry and animal husbandry as the pillar industry, and the ecological restoration effects of treating waste with waste and turning waste into wealth are achieved. Results of the embodiment show that when the method provided by the invention is used for land improvement, the volume weight and the field moisture capacity of the soil can be effectively improved, nutritional ingredients in the soil are greatly improved, and the improved soil meets the standard of Soil Environment Quality Agricultural Land Soil Pollution Risk Management and Control Standard (Trial) (GB15618-2018).

The invention relates to a preparation method of quartz sand, and belongs to the technical field of quartz. The preparation method comprises the following steps: S1, adding a polyvinyl butyral solution into silica sol, and uniformly stirring to obtain silica sol dispersion liquid; the polyvinyl butyral solution comprises polyvinyl butyral (PVB) and tert-butyl alcohol; s2, performing spray drying on the silica sol dispersion liquid to obtain quartz microspheres; and S3, carrying out oxidation carbon removal treatment and vacuum dehydroxylation treatment on the quartz microspheres to obtain the quartz sand. Drying cracking and micro-hollow structure defects of the quartz sand can be effectively eliminated, it is ensured that the product is compact and free of pores, and the structural integrity and the use reliability are greatly improved; the density performance bottleneck of quartz sand is successfully broken through, and the bulk density after sintering is remarkably improved; the particle size distribution of the quartz sand can be accurately controlled, and the product particle size uniformity is ensured.

The invention provides a soil carbon reserve measuring and calculating method and system and a medium, and belongs to the technical field of organic carbon reserves, and the method comprises the following steps: obtaining surface layer reflectivity spectral data of each layer of soil after construction of a disturbance area; dividing a plurality of grids based on the spatial distribution characteristics of the reflectivity spectrum; according to the coordinates of the center position of each grid, the soil texture and land utilization type corresponding to each grid in the database are called, and according to the reflectivity spectral characteristics of each grid, the soil organic carbon content on each grid is inverted through a pre-trained organic carbon content estimation model; according to the center position coordinate of each grid, calling the corresponding soil bulk density on each grid in the database, and determining the soil organic carbon reserve on each grid based on the soil bulk density and the soil organic carbon content; wherein the database stores soil texture, volume weight and land utilization type data corresponding to different coordinates; and obtaining the soil organic carbon reserve of the disturbance area according to the soil organic carbon reserve of each grid. The method can efficiently calculate the soil carbon reserve in the field.

The invention relates to the field of agricultural planting, in particular to a post-ginseng land soil improvement method based on compound bacteria fermentation degradation of allelochemicals. The invention provides a main technological process for improving soil through a fermentation method. The main technological process comprises the steps of land consolidation, ridge forming and pond building, material preparing and feeding and soil-material mixing, zymophyte inoculation and bacterium-material combination, film mulching anaerobic and fermentation monitoring, fermentation completion and post-treatment. The invention also provides a complex microbial inoculant composition capable of achieving the improvement effect, and the complex microbial inoculant composition comprises the following components in parts by weight: 5 parts of straw returning agent, 3 parts of organic fertilizer leavening agent and 1 part of bacillus subtilis agent. According to the method, the improved soil is subjected to long-time anaerobic fermentation in the water stain micro-ecological environment, the organic matter content of the soil can be greatly increased by adding a large number of organic matter materials, the carbon / nitrogen ratio of the soil is increased, the bulk density of the soil is reduced, fertility is comprehensive, sufficient and balanced, and the method is suitable for continuous cropping planting and healthy growth of ginseng.

The invention provides a ceramsite proppant as well as a preparation method and application thereof. The method comprises the following steps: grinding a coal gangue raw material, pre-sintering, cooling and then grinding again; grinding the tungsten tailing sand, the low-grade bauxite, the carbide slag and the clay; grinding after mixing the raw materials; the raw materials comprise 45-60 parts of low-grade bauxite, 20-35 parts of pre-sintered coal gangue, 15-20 parts of tungsten tailing sand, 1-5 parts of carbide slag and 7-14 parts of clay; the total amount of the low-grade bauxite, the pre-sintered coal gangue and the tungsten tailing sand is 100 parts; granulating and drying; carrying out first sintering at 800-950 DEG C; second sintering is conducted at the temperature of 1050-1200 DEG C; and naturally cooling to obtain the ceramsite proppant. The technical problem to be solved is how to realize high-valued utilization of mine solid waste and low-grade bauxite, reduce dependence on high-quality bauxite and production cost, reduce sintering energy consumption and carbon emission, reduce product body density and improve key performance such as strength and sphericity of the proppant by optimizing raw material combination and a preparation process. And the requirements of oil and gas field fracturing operation are met.

The invention discloses a rapid distinguishing method for predicting a nitrogen source produced by flooded soil through combination of in-situ observation and a model, and relates to the technical field of agro-ecology. Field micro-areas are divided in a target area, an intelligent sensing system is deployed, and soil environment parameters are monitored in real time; the method comprises the following steps: sampling soil in a target area, measuring soil bulk density, root layer depth, total nitrogen content and 15N abundance parameters of a soil sample, and obtaining soil basic data; and calculating the optimal 15N fertilizer abundance according to the recommended nitrogen fertilizer dosage recommended by the target area in combination with the soil nitrogen library content, the fertilizer application amount and the soil background 15N abundance. According to the method, dynamic changes of soil environment parameters are captured through combination of in-situ observation and an intelligent sensing system, the generation rate of nitrogen isotopes is monitored synchronously, the limitation that a traditional method depends on a single parameter is avoided, the distinguishing precision of nitrogen loss sources is remarkably improved, and the contribution rate of the in-situ observation and the intelligent sensing system to nitrogen loss can be rapidly calculated by combining model analysis.

The invention discloses a straw pre-wetting time judgment method and system, particularly relates to the technical field of agricultural waste treatment intelligent control, and is used for solving the problem of multi-target conflict between existing pre-wetting process parameters and tunnel fermentation energy consumption. The method comprises the following steps: acquiring initial moisture content and bulk density distribution data of straw in real time, identifying spatial distribution of a high-density blocking region and a low-density permeation channel in a stacking layer, and generating an effective length reflecting a moisture permeation path; generating a pre-wetting time reference value based on dynamic weight fusion of the current batch and historical pre-wetting data, and performing collaborative correction in combination with a coupling relationship between equipment idling time and ventilation energy consumption; the pre-wetting time threshold value is dynamically adjusted through a cooperative feedback mechanism of the main fiber direction of the straw stalks and the acoustic impedance characteristics of the stacking layers; finally, a termination instruction is triggered according to the continuous stable state of the surface layer moisture content and the fiber orientation, and precise balance between energy consumption and process efficiency is achieved while the pre-wetting uniformity is improved.

The invention relates to the technical field of road material engineering, in particular to an asphalt mixture gradation optimization method and device, electronic equipment and a storage medium. According to the gross volume relative density, the apparent relative density and the tamping density of each grade of aggregate, the actually measured stacking density of each grade of aggregate is calculated; on the premise of ensuring that the pre-estimated void ratio, the pre-estimated asphalt saturation and the pre-estimated mineral aggregate void ratio meet the target requirements, in the standard grading range and the parameter value range of the Bailey method, the maximum pre-estimated stacking density, the maximum pre-estimated mineral aggregate void ratio and the minimum pre-estimated asphalt-aggregate ratio are used as target functions, grading iterative optimization is carried out by utilizing a multi-target particle swarm algorithm, and the maximum pre-estimated stacking density, the maximum pre-estimated mineral aggregate void ratio and the minimum pre-estimated asphalt-aggregate ratio are obtained. The Pareto solution of the optimized gradation is obtained; analyzing the Pareto solution of the optimized gradation, and selecting a plurality of groups of optimized gradation according to the principle of minimum asphalt-aggregate ratio. According to the method, the economical efficiency and the success rate of grading optimization of the asphalt mixture are improved.

The invention discloses graded metal powder for cold metal fusion additive manufacturing, which is characterized in that metal powder with different particle sizes is graded to form multimodal particle size distribution powder, and the metal powder with different particle sizes is compounded in a gap filling manner; multi-peak particle size distribution powder obtained by grading metal powder of various particle sizes balances the fluidity and the stacking density, the metal powder of different particle sizes can be subjected to gap filling, for example, coarse particle powder dominates the fluidity, the CMF powder laying uniformity is ensured, gaps of the coarse particle powder are filled with medium particle powder, and the CMF powder laying uniformity is ensured. And then superfine particle powder is adopted to fill the remaining gaps, the superfine particle powder provides a high specific surface area, and the sintering driving force is improved. Compared with single powder, the tap density obtained through powder grading is increased by more than 10%. And the CMF process can be well adapted through the graded metal powder, the thickness of a powder laying layer can be better matched, and interlayer dislocation is avoided.

The invention provides a method for simulating and quantifying physical stress of field soil based on field in-situ monitoring and a model. The method comprises the following steps: step 1, acquiring soil bulk density, water content and penetration resistance values under different water potentials; step 2, fitting the transfer equation of each limiting condition by using each measured data in the step 1, and establishing soil transfer equations of four limiting conditions of LLWR; 3, field soil bulk density dynamic measured data are obtained; 4, constructing a field soil bulk density dynamic prediction model in the implementation stage and the expansion and shrinkage stage under the influence of cultivation and rainfall; step 5, acquiring actually measured data of field rainfall and soil water content of the research area; and step 6, obtaining the LLWR range of the research area and the dynamic change of each limiting condition. The method solves the technical problems that in the prior art, seasonal dynamic of soil bulk density, which is a key transmission variable influencing LLWR, is ignored, and it is difficult to accurately estimate dynamic changes of LLWR in seasons and quantify physical stress caused by the LLWR on crop growth.

The utility model discloses a cutting ring for measuring soil bulk density by stratified sampling. The cutting ring comprises a cutting ring main body, the outer side of the supporting mechanism is of a rectangular structure, and a cutting ring body capable of moving up and down is arranged in the middle of the supporting mechanism; the system further comprises; the soil scraping mechanism comprises a pedal, a moving mechanism and a scraper main body; the pedal is arranged on the outer side of the supporting mechanism, the inner side of the pedal is connected with the scraper body through the moving mechanism, and the scraper body stretches out and is stored under the action of the moving mechanism and is used for cutting the bottom of the scraper body to scrape redundant soil. According to the cutting ring for measuring the soil bulk density through stratified sampling, scales are arranged outside the connecting rod, when the whole cutting ring body is taken out, the cutting ring body can be taken out along with rising of the connecting rod, outside soil does not need to be dug, and therefore stratified sampling work can be conducted at the same soil taking position.

The invention provides a soil conditioner and a preparation method and application thereof, ardealite and rice straw are mechanically crushed, and the crushed ardealite and rice straw are respectively pretreated with a tannic acid solution and a potassium hydroxide solution. The pretreated ardealite and rice straw are dried and placed in inert gas and water vapor to be mixed and calcined, a solid product, humic acid, bentonite, sodium lignin sulfonate and polyacrylamide are mixed and smashed, and the conditioner for soil improvement is obtained after granulation. The soil conditioner is prepared by synergistically calcining the ardealite and the rice straws, the problems that the pH is low, harmful elements are easy to overflow and the like when the ardealite is independently used as a soil conditioner are solved, a new way is provided for comprehensive utilization of the ardealite, and the prepared soil conditioner has the function of slowly releasing nutrient elements of potassium, sulfur and calcium and has a good application prospect. The soil conditioner has the effects of regulating soil bulk density, loosening soil, retaining water and improving soil fertility durability in the aspect of improving soil quality.

A method of shaping a shaping material, the shaping material including a powder of a fluororesin, the powder of the fluororesin having a static bulk density of 0.3 g / ml or more and 1.5 g / ml or less, and the powder of the fluororesin having a particle diameter of 10 μm or more and 300 μm or less in terms of D50.

The invention discloses an undisturbed soil bulk density measuring method and measuring device based on sediment characteristics, and the undisturbed soil bulk density measuring method comprises the following steps: sampling undisturbed soil, putting the undisturbed soil into a measuring bottle, and injecting water to a standard water level to obtain a water-soil mixed solution and stirring; the measuring bottle is placed in an NFC induction area on the soil bulk density measuring table, an NFC chip sticker at the bottom of the measuring bottle is inducted, the induction time serves as the sedimentation starting time of soil particles in the measuring bottle, and the sedimentation starting time of the soil particles is transmitted to a data terminal to be recorded; moving the measuring bottle to other places for standing until the soil particles are completely deposited at the bottom of the container; the measuring bottle is placed in the NFC sensing area again to sense the NFC chip patch, the sensing time serves as the settling ending time of the soil particles, the laser distance measuring sensor is controlled to be started through the controller, and the distance between the upper surface of the wet sediment and the laser distance measuring sensor and the distance between the bottom of the measuring bottle and the laser distance measuring sensor are measured respectively; and transmitting the acquired data to a data terminal to calculate the volume weight of the undisturbed soil.

This invention discloses a process for preparing solid sodium silicate based on controllable particle size water quenching, belonging to the field of inorganic silicate chemical technology. The specific steps are as follows: S1: raw material melting and homogenization; S2: controllable particle size water quenching; S3: solid-liquid separation and online classification; S4: deep drying and packaging. This invention achieves innovation and simplification of the production process: through a one-step "atomization-cooling" forming method, the high-energy-consuming crushing and screening processes in traditional processes are completely eliminated, shortening the process flow and reducing equipment investment and maintenance costs; it significantly improves the overall quality of the product: directly generating solid particles with high sphericity and smooth surface, the product has good flowability, stable bulk density, high whiteness, and no tendency to agglomerate during subsequent dissolution, with a faster dissolution rate and superior application performance.

The invention relates to the technical field of silicon carbide powder bulk density measurement, in particular to a method for accurately measuring the bulk density of silicon carbide powder. The method comprises the following steps: placing powder in a container, adding volatile liquid to fill gaps, weighing and measuring the volume; solid-liquid separation is achieved through heating and condensation, the weight and volume of liquid are measured respectively, the weight and volume of powder are calculated, and finally the bulk density is obtained. According to the method, a closed environment and a solid-liquid separation technology are utilized, the measurement precision is remarkably improved, the problem of errors caused by gaps among particles is solved, data support is provided for silicon carbide crystal quality improvement, and the method is suitable for accurate measurement of powder with various particle size distribution.

The invention discloses a deep surrounding rock anchor rod spacing quantitative determination method based on fracture toughness parameters. The method comprises the following steps: obtaining the fracture toughness and uniaxial compressive strength of rock through an indoor test; determining a uniaxial compression parameter and an elastic modulus of the rock mass by combining a geological strength index GSI, a damage factor D and a Hoek-Brown criterion; calculating a brittleness index B4 by using the fracture toughness of the surrounding rock, the uniaxial compressive parameter of the rock mass and the elastic modulus; and based on the brittleness index B4, the rock mass elasticity modulus, the engineering burial depth and the rock mass volume weight, a quantitative calculation formula of the anchor rod spacing is established, an empirical coefficient is solved in combination with the spacing range of the corresponding surrounding rock grade in the specification, and finally quantitative determination of the anchor rod spacing is achieved. The method overcomes the defect that quantitative basis is lacked in spacing adjustment in existing specifications, and is particularly suitable for anchor rod support design for controlling brittle failure of surrounding rocks under the deep high-stress condition.

A product and method of producing a product that may comprise diatomaceous earth, clay and dispersant. The clay may comprise (a) attapulgite or (b) sepiolite or (c) attapulgite and sepiolite. A portion of the clay and a portion of the diatomaceous earth is agglomerated to form a plurality of composite particles, wherein the composite particle is at least partially surface treated with the dispersant. The product may have a particle size distribution having a d50 of 5-40 microns and a d10 of 1-15 microns. The product may have a median pore diameter of 2-10 microns, a pore volume of 1-4 mL / g and a bulk density of 50-300 kg / m3.

The application provides a kind of stack type light weight high strength concrete material and its preparation method.The application is filled in the mold by stacking ceramsite, and the ceramsite fills the mold in a close-packed manner;Then, according to the preset weight fraction, the cement, silica fume, saw mud, fly ash floating bead, hollow glass microsphere, fly ash, water reducing agent and water are weighed, and the high fluid light weight high strength mortar is obtained after fully mixing, and it is poured into the mold filled with ceramsite, so that the high fluid light weight high strength mortar fills the gap between the ceramsite, and the light weight high strength concrete material is obtained after curing. Through the above-mentioned manner, the application can prepare the high fluid light weight high strength mortar with slightly lower density than the ceramsite, to ensure that the pouring process will not appear the phenomenon of ceramsite floating, and effectively utilize the space skeleton formed by the mutual lap of ceramsite in the stacking process to effectively improve the strength of the concrete, so that the prepared stack type light weight high strength concrete material has low bulk density and high strength.