1992 results about "Bentonitic clay" patented technology

The invention discloses a carbon composite ceramic linear resistor and a preparation method thereof, and belongs to the technical field of power electronic components. The invention provides a preparation method of a carbon composite ceramic linear resistor, which comprises the following steps: uniformly mixing bentonite, silicon carbide and nano carbon black to obtain powder, uniformly mixing the powder and ethanol, drying, adding a binder solution, and carrying out green body forming to obtain a green body; carrying out heat preservation on the green body at 1150-1300 DEG C in a nitrogen-containing gas atmosphere to obtain a sample; and polishing the sample, and spraying aluminum to obtain the carbon composite ceramic linear resistor. According to the method for preparing the carbon composite ceramic linear resistor, the resistivity of the material can be reduced, and the thermal shock resistance of the ceramic resistor can be improved.

The invention discloses a preparation method and application of interpenetrating network gel based on bentonite minerals, and belongs to the technical field of collapsible loess improvement. According to the prepared bentonite mineral interpenetrating network gel (BT-PAA / PEG / PVA), bentonite serves as a crosslinking node and cooperates with a PAA ion network, a PEG flexible chain segment and a PVA rigid hydroxyl network to construct a triple interpenetrating structure, high water absorption, compression resistance, salt resistance and long-term stability are achieved, the gel is applied to collapsible loess improvement, and the collapsible loess improvement effect is good. And gel particles and soil particles are combined to form an anchoring effect, so that the permeability of a soil body is reduced and the soil body is prevented from collapsing.

The invention discloses a low-carbon polymer modified all-solid waste premixed fluid-state soil, which is prepared from the following components in parts by weight: 10-30 parts of low-carbon polymer modified all-solid waste premixed fluid-state soil, the concrete is prepared from the following components in parts by weight: 5-10 parts of a modifier, 5-10 parts of an exciting agent, 1-5 parts of an additive, 1-5 parts of a retarder, 10-20 parts of coal gangue powder, 10-20 parts of carbide slag, 10-20 parts of bentonite, 35-40 parts of fly ash, 35-40 parts of slag powder, 100 parts of clay powder, 145 parts of machine-made medium sand and 150 parts of water. According to the invention, the polymer polyacrylamide is added into the fluid soil, so that the compressive strength of the fluid soil stone body is improved; when the polyacrylamide is mixed with the fluid soil, active components in the polymer emulsion and components in the fluid soil are subjected to a cross-linking reaction to form a more complex network structure, so that a dispersion system of the slurry can be remarkably improved, the repulsive potential energy among particles in a multiphase dispersion is reduced, and the integrity and the stability of the slurry are enhanced; the slurry is not easy to separate when being injected into underground rock strata or fractures, and good uniformity and flowability are maintained.

The invention provides a method for predicting the effective diffusion coefficient of nuclides in bentonite. The method comprises the steps of obtaining a data set; the data set comprises the pH value of underground water; and constructing a nuclide effective diffusion coefficient model by using the data set, and predicting the effective diffusion coefficient of a certain radioactive element in bentonite by using the constructed nuclide effective diffusion coefficient model. According to the method provided by the invention, the prediction precision of the effective diffusion coefficient of the nuclide can be effectively improved.

The invention discloses a high-precision foundation pit support leakage potential measurement system and method, an electrode matrix, an electric field establishment module, a reference electrode, a multi-channel electric signal parallel measurement device and a data processing terminal are arranged in a foundation pit, and the outer side of a non-polarized electrode of the electrode matrix is filled with bentonite slurry; the bentonite slurry can infiltrate the contact part of the non-polarized electrode and a foundation pit soil body so as to change the property of the soil body, so that the contact potential of the electrode matrix and the soil body is controlled, the measurement error is reduced, meanwhile, an ion concentration meter and a temperature sensor are arranged in the non-polarized electrode and the reference electrode of the electrode matrix respectively, and the measurement accuracy is improved. The data processing terminal can correct the potential difference according to the electrode temperature and the ion concentration of the non-polarized electrode and the reference electrode temperature and the reference ion concentration of the reference electrode to calibrate the electrode range caused by the temperature and the ion concentration, so that the real potential difference of the foundation pit is obtained, and the measurement precision is effectively improved. And the accuracy and reliability of a foundation pit leakage detection result are improved.

The invention provides a high-performance shield intelligent synchronous grouting control system based on solid waste residue soil resource utilization, a grouting material and a preparation method, and relates to the technical field of shield engineering, the high-performance shield intelligent synchronous grouting control system comprises a parameter obtaining module used for obtaining key parameters, the actual grouting amount and the actual grouting pressure; the error calculation module is used for calculating a grouting amount error and a grouting pressure error; the error fuzzy classification module is used for fuzzy grade classification; the membership calculation module is used for calculating the membership of the grouting amount error and the grouting pressure error to each fuzzy grade category; the fuzzy rule base construction module is used for establishing an initial fuzzy rule base and adjusting and optimizing the initial fuzzy rule base to obtain a final fuzzy rule base; and a grouting process adjusting module. The solid waste muck is used for replacing bentonite and part of sand aggregate, so that the material cost is remarkably reduced, outward transportation and landfill of waste are reduced, and the burden on the environment is reduced.

The invention discloses a cold patch asphalt mixture based on dearomatization solvent oil and a preparation method thereof, the cold patch asphalt mixture comprises the following substances in percentage by mass: 89-91 wt% of aggregate, 2-3 wt% of mineral powder, 2-3 wt% of cement, 0.4-0.6 wt% of bentonite and 4-6 wt% of asphalt cold patch liquid, and D60 dearomatization solvent oil is used as a diluent in the asphalt cold patch liquid. The preparation method comprises the following steps: preparing asphalt cold supplementing liquid, and preserving heat for later use; drying the aggregate, the mineral powder, the cement and the bentonite, and preserving heat for later use; the mixing pot is heated, and the aggregate, the cement and the bentonite are put into the mixing pot to be stirred; adding the asphalt cold supplementing liquid into the mixing pot for stirring; and adding the mineral powder into the mixing pot, and stirring to obtain the cold patch asphalt mixture based on the dearomatization solvent oil. The cold patch asphalt mixture prepared by the invention has excellent comprehensive performance, perfectly meets the performance requirement of a hot mix asphalt mixture, can quickly form strength, can quickly open traffic after repairing pits and slots, and has small influence on road traffic.

The invention relates to the field of civil engineering waterproof materials, in particular to a nano bentonite-polymer composite material with high salt tolerance and a preparation method thereof, and the nano bentonite-polymer composite material is especially suitable for a sodium-based bentonite waterproof blanket in a saline soil area or a marine environment, and the preparation method comprises the following steps: (1) preparing nano bentonite lamellar colloidal dispersion liquid; (2) introducing and mixing an electrostatic screening agent and a polymerizable monomer; (3) carrying out in-situ free radical polymerization reaction; and (4) post-treatment and finished product preparation. By constructing a three-dimensional interpenetrating hierarchical structure composed of a covalent grafted polymer network, a physically anchored electrostatic screening agent and a stripped bentonite nanosheet layer, effective protection of a bentonite core anti-seepage unit is realized, so that the adaptability and long-term stability of the material under a complex water quality condition are remarkably improved.

The invention provides a dump leaching method for improving the leaching rate of gold ore, and belongs to the technical field of mineral processing. The method comprises the following steps: firstly, separating minerals into oversize products and undersize products; mixing sodium carboxymethyl cellulose, bentonite and ferrous sulfate to obtain a mixture, and granulating the undersize product by using the mixture as a binder; and mixing the undersize product particles with the oversize product, and carrying out cyanide-free dump leaching. According to the method, through graded granulation and heap building, the problem that heap building permeability is poor due to the fact that the gold ore contains many clay minerals is solved. In the granulation stage, ferrous hydroxide colloid generated by hydrolysis of ferrous sulfate in the binder can assist ore particle agglomeration, and particle stability is enhanced; during subsequent cyanide-free dump leaching, ferrous sulfate can be used as an auxiliary reducing agent and a catalyst in a thiourea gold leaching system to promote oxidation and dissolution of gold; meanwhile, ferrous ions can adjust the oxidation-reduction potential of a system, so that the thiourea gold leaching reaction is in a more favorable potential interval, the oxidation efficiency of thiourea is improved, invalid decomposition of thiourea is reduced, and therefore the use amount of thiourea and the use amount of agents are reduced.

The invention relates to a preparation method and application of high-temperature-resistant organic modified bentonite. According to the method, three organic modifiers of long-chain quaternary ammonium salt, amide and a silane coupling agent are compounded to modify bentonite, and the problem that a single modifier is easy to decompose at high temperature is solved through the synergistic effect of physical intercalation, chemical crosslinking and interface bonding; and secondly, a three-dimensional stable structure is constructed by adding nano silicon dioxide and a composite modifier, so that the high temperature resistance and dispersion stability of the modified bentonite are further enhanced. According to the invention, the requirements of deep well and ultra-deep well drilling fluids on the temperature resistance and rheological property of the treating agent can be met, and the ultra-deep well drilling fluid which can tolerate the high temperature of 250-300 DEG C, and is low in filter loss and good in dispersion stability can be obtained.

The invention relates to the technical field of tunnel engineering building materials, in particular to a double-slurry synchronous grouting material based on shield silty-fine sand and a preparation method of the double-slurry synchronous grouting material based on shield silty-fine sand. The liquid A is prepared from, by weight, 20%-30% of cement, 30%-50% of shield silty-fine sand, 5%-10% of bentonite, 5%-15% of mineral admixture, 0.1%-0.5% of stabilizer and 20%-30% of water, and the stabilizer is a water-soluble high-molecular polymer; the solution B is a water glass solution, and the volume ratio of the solution A to the solution B is (10-15): 1; the double-slurry synchronous grouting material further comprises a retarder and a coagulant, the retarder is citric acid, and the coagulant is a nano Ca (OH) 2 crystal nucleus. Bidirectional and gradient regulation and control of the gelation time between 5s and 100s can be realized through the coagulant and the retarder, and diversified requirements of different geological conditions and construction progress on slurry operation time are met.

The invention discloses a loess slope ecological protection vegetation substrate and a preparation method and a performance detection method thereof, and belongs to the technical field of slope ecological protection. The invention solves the problem of how to develop a novel slope ecological protection base material which is ecological, environment-friendly, good in vegetation effect and low in cost. The soil comprises a base material and plant seeds mixed in the base material, the use amount of the plant seeds is 20-30 g / m < 2 >, and the base material comprises the following components in parts by weight: 100-110 parts of loess, 20-30 parts of bentonite, 20-30 parts of bentonite, 20-30 parts of bentonite, 10- 4 to 10 parts of bentonite; 0.1 to 0.3 part of basalt fiber; 0.2 to 0.4 part of a water-retaining agent; 0.8-1.2 parts of an organic fertilizer; 0.5-0.8 part of a compound fertilizer; 2-3 parts of a microbial fertilizer; and 44-48 parts of water. Bentonite is used for replacing cement and other harmful binders, a natural soil system of the base material is maintained, the base material is more environmentally friendly, meanwhile, the water retention capacity of the base material is improved, the pH value of the base material does not need to be adjusted, plant growth is facilitated, the air permeability of the base material is improved through basalt fibers, the shearing performance, the crack resistance and the water stability of the base material are improved, and the service life of the base material is prolonged. And a stable growth environment is provided for vegetation.

The invention provides a biochar composite porous material for heavy metal contaminated soil remediation and a preparation method and application of the biochar composite porous material. The preparation method comprises the steps that biomass raw materials are subjected to high-temperature pyrolysis carbonization and then smashed, ground and sieved, and biochar powder is obtained; dispersing in a phosphoric acid solution to obtain a biochar solution, and filtering, washing and drying after a hydrothermal activation reaction to obtain activated biochar; dispersing in a chitosan solution, carrying out ultrasonic oscillation, filtering, washing and drying to obtain modified charcoal; mixing sodium bentonite, attapulgite and deionized water, uniformly mixing the modified charcoal, the functional slurry and a sodium carboxymethyl cellulose solution to obtain composite slurry, performing compression molding to obtain a green body, and then drying and calcining the green body. The biochar composite porous material prepared by the invention can simultaneously play multiple roles of physical adsorption, chemical chelation, ion exchange and the like in a heavy metal contaminated soil treatment process, so that efficient fixation of various heavy metal ions is realized.

The invention relates to the technical field of soil remediation, in particular to a soil ecological remediation agent based on coal gangue-fly ash and a preparation method of the soil ecological remediation agent. The soil ecological restoration agent comprises the following components in parts by weight: 40-50 parts of coal gangue-fly ash mixed powder, 6-12 parts of a microbial agent, 15-20 parts of humic acid, 6-12 parts of sodium polyacrylate, 8-12 parts of straw carbon, 20-25 parts of bentonite and 4-6 parts of aluminum sulfate. The soil ecological restoration agent can supplement trace elements into soil, meanwhile, the coal gangue-fly ash can adsorb heavy metals in the soil so as to fix the heavy metals, the microbial agent can be loaded on the surface of the coal gangue-fly ash, the heavy metals adsorbed on the coal gangue-fly ash are precipitated through the microbial agent, and the heavy metals adsorbed on the coal gangue-fly ash can be fixed. The concentration of heavy metal ions in the soil is reduced.

The invention relates to the technical field, in particular to an ultralight foamed ceramic hollow sphere prepared from iron lepidolite tailings and a preparation method and application of the ultralight foamed ceramic hollow sphere. The foamed ceramic hollow sphere is prepared from the following raw materials: iron lepidolite tailings, silicon carbide, bentonite, sodium carbonate and potassium carbonate; in percentage by mass, the content of the iron lepidolite tailings is 90 to 96.4 percent; the content of the silicon carbide is 0.1-1%; the iron lepidolite tailings are prepared from the following components in percentage by mass: 77 to 80 percent of SiO2, 10 to 13 percent of Al2O3, 1.3 to 1.6 percent of Fe2O3 and 0.1 to 0.17 percent of Li2O. The ultralight foamed ceramic hollow sphere is prepared by using the iron lepidolite tailings, the silicon carbide, the bentonite, the sodium carbonate and the potassium carbonate as raw materials, can meet various market requirements of heat preservation, heat insulation, sound insulation, noise reduction and the like, and brings remarkable economic benefits and social benefits.

The invention discloses an earth surface directional drilling high-pressure deep hole grouting construction method based on steel sleeve hole fixing. The earth surface directional drilling high-pressure deep hole grouting construction method comprises the following steps that firstly, a directional drilling machine is used for vertically drilling a grouting hole downwards; secondly, a plurality of steel floral tubes are sequentially put down in the three-opening first branch grouting hole; thirdly, cement-bentonite-based sleeve shell materials are continuously injected into the first section of the steel floral tube to the inner bottom of a first branch grouting hole of the three-opening hole, and an annular space between the first branch grouting hole of the three-opening hole and the steel floral tube string is filled with the cement-bentonite-based sleeve shell materials; fourthly, a packer is lowered to the bottom of the three-opening first branch grouting hole; a packing section is formed in front of the packer; and fifthly, cement grout is injected into the grouting pipe, grouting is conducted on the packing section, the finally-set cement-bentonite-based casing material is split and damaged under the effect of grouting pressure, and the grouting grout is injected into the stratum to be reinforced through the grout channel. According to the method, the hole collapse phenomenon when the grouting hole penetrates through the unfavorable geological section can be prevented, the grouting stopping effect of the packer is guaranteed, and retreating type segmented grouting construction is guaranteed.

The invention belongs to the technical field of tunnel engineering, and particularly relates to shield tunneling machine anti-drag slurry for stacked tunnel construction and a use method of the shield tunneling machine anti-drag slurry. According to the anti-drag slurry, bentonite, anhydrous Na2CO3 and water are used as main raw materials, a certain amount of a lubricant and a nanometer material are added into the slurry to prepare the anti-drag slurry, the stress condition between a shield tunneling machine shell and a soil body is monitored in real time, the grouting amount and the grouting pressure of the anti-drag slurry are dynamically adjusted according to the change of soil pressure, and therefore the anti-drag effect of the shield tunneling machine is achieved. The friction force between the shield tunneling machine shell and the surrounding soil body can be reduced, disturbance of the shield tunneling machine shell to the soil body is reduced, consolidation settlement of the soil body in the later period is reduced, and materials and methods are provided for stacked tunnel construction.

The invention discloses base paper for aluminum spraying and a preparation method thereof, and relates to the technical field of base paper. The preparation method comprises the following steps: pulping softwood pulp, then adding deionized water to dilute the softwood pulp until the mass concentration is 0.8%-1%, then adding modified gel particles, modified bentonite and a PAE wet strength agent, adjusting the pH value to 6.5-7.5, stirring for 40-60 minutes, and then adding deionized water to dilute the softwood pulp until the mass concentration is 0.5%-0.7% to obtain mixed paper pulp; and then making the mixed paper pulp into paper sheets, squeezing, drying, coating the surface layer coating on the surface of base material paper, and drying with hot air to obtain the body paper for aluminum spraying. According to the invention, the modified gel particles and the modified bentonite are added, so that the mildew-proof and moisture-proof capabilities of the base paper for aluminum spraying are effectively improved; the introduction of the surface coating further improves the mildew-proof and moisture-proof capabilities. Therefore, the method has a wider application prospect.

The invention relates to a high-performance environment-friendly synchronous grouting material and a preparation method thereof. The raw materials of the synchronous grouting material include, by weight, 10-15 parts of cement, 15-20 parts of slag, 20-30 parts of steel slag, 300-320 parts of mud-containing powdered fine sand, 0.075-0.1 parts of iron sulfide, 0.05-0.12 parts of graphene oxide, 0.03-0.09 parts of N,N-diisopropylformamide and 45-50 parts of water. The invention uses the mud-containing powdered fine sand as a raw material to replace bentonite and fine sand in the original synchronous grouting material, and mixes cement, slag, iron sulfide, graphene oxide and other materials. The components act synergistically, so that the prepared synchronous grouting material has excellent impermeability and compressive strength, short setting time, low carbon and environmental protection, and high economic and social benefits.

The invention discloses a composite system geopolymer grouting material and a preparation method thereof. The composite system geopolymer grouting material comprises the following raw materials in percentage by mass: 50-70% of coal gangue, 10-30% of fly ash and 10-30% of cement. Functional additives: 5%-20% of desulfurized gypsum and 5%-15% of bentonite; the composite exciting agent is formed by compounding carbide slag and sodium silicate according to the mass ratio of 1: 1-1: 2. The geopolymer is excellent in mechanical property, meets engineering requirements, is remarkable in environmental protection benefit, conforms to double-carbon target low-carbon process innovation: a calcination-free process: traditional high-temperature calcination is abandoned (the temperature needs to be 550-900 DEG C), carbon emission is reduced by more than 30% (compared with a contrast, the carbon emission of a traditional process is increased by 35%), and the geopolymer conforms to the green positioning of low energy consumption and low three wastes of geopolymers. The cost advantage is prominent, the economic value is remarkable, the raw material cost is reduced, specifically, the coal gangue (low-cost solid waste) is used for replacing 30%-50% of cement, and the comprehensive raw material cost is reduced by 40% (compared with a traditional cement-based grouting material).

The invention relates to a synchronous grouting material based on muddy silt shield muck and a preparation method thereof, and the synchronous grouting material comprises the following raw materials in parts by weight: 13 to 16 parts of cement, 16 to 20 parts of slag, 142 to 147 parts of fine sand containing silt powder, 0.03 to 0.1 part of trimethylsilyl ethyl acetate, 0.07 to 0.17 part of disodium hydroxyethylphosphonate, 0.03 to 0.1 part of pentasodium amino trimethylene phosphonate and 63 to 67 parts of water. According to the invention, the fine sand containing mud powder is used as a main raw material to replace bentonite and fine sand in synchronous grouting in the prior art, and is combined with a specific cement additive, so that the compressive strength and the impermeability of the synchronous grouting material are effectively improved through the synergistic effect of the components, local materials can be used, and the outward transportation and disposal cost of a large amount of muck can be greatly reduced.

The present application relates to the technical field of thin ceramic tile production, and specifically discloses a low-temperature sintered thin ceramic tile and a production method. The thin ceramic tile is mainly made of the following raw materials in parts by weight: 15-25 parts of pyrophyllite, 10-20 parts of potassium feldspar, 10-20 parts of sodium feldspar, 10-20 parts of mullite, 20-30 parts of quartz sand, 6-10 parts of micron metal oxide, 4-6 parts of flake graphite, 4-6 parts of aluminum borate whiskers, 6-8 parts of aluminum oxide fiber, 2-4 parts of metal aluminum powder, 1-3 parts of flux, 3-7 parts of ball clay, 8-12 parts of bentonite, and 13-17 parts of silica sol adhesive. The thin ceramic tile, through the mutual cooperation between the raw materials, can not only achieve low-temperature sintering, but also has the advantages of high breaking strength, high modulus of rupture, and low water absorption, improves the quality of thin ceramic tiles, expands the scope of application, increases the stability of use, prolongs the service life, and meets market demand.

The invention relates to the technical field of ceramics, in particular to celadon glaze water, ceramics and a preparation method thereof, and the preparation method comprises the following steps: preparing the celadon glaze water: preparing 10-15 parts of cooked talc, 5-8 parts of an additive modifier, 4-7 parts of ball clay, 4-7 parts of modified dolomite, 2-4 parts of Longquan porcelain clay, 2-4 parts of zinc oxide and 2-4 parts of tin oxide; the ceramic of the celadon glaze water is prepared by the following steps: blending potassium feldspar, quartz, kaolin and bentonite, and carrying out wet ball milling to obtain a ball-milled material; the preparation method comprises the following steps: by taking calcined talc, ball clay, Longquan porcelain clay, zinc oxide and tin oxide as matrix materials, adding a modifier and modified dolomite as functional aids, and blending and coordinating the matrix materials and the functional aids, obtaining the celadon glaze water with excellent surface wear resistance and impact strength.

The invention discloses a slow-release phosphorus removal material and a preparation method and application thereof, and belongs to the technical field of sewage treatment, the slow-release phosphorus removal material comprises the following components by mass: 40-55 parts of calcium peroxide, 25-35 parts of a binder, 2-5 parts of bentonite, 5-20 parts of calcined oyster shell powder, and 10-25 parts of iron-loaded modified red soil; the binder is prepared from Portland cement, polyacrylic acid and hydroxypropyl methyl cellulose ether according to the mass ratio of 1: (0.2 to 1): (0.1 to 0.8). Under the synergistic effect of the calcium peroxide, the binder, the bentonite, the calcined oyster shell powder and the iron-loaded modified red soil, the filter material can be used as a phosphorus removal filter material, can be directly used as a filter material of a filter tank, a wetland and the like independently or in combination with quartz sand, gravel and other filter bed filter materials, can permanently remove phosphorus in surface water, can also be directly put into rivers, lakes and ponds, and can be used as a filter material of a filter tank, a wetland and the like. In addition, the preparation cost is low, and wide application prospects are achieved.

The invention provides a dredging and blocking combined salinized soil roadbed novel composite liner separation layer and a roadbed structure. The composite liner separation layer comprises a first layer of non-woven geotextile, an upper layer of three-dimensional geotextile drainage network, a second layer of non-woven geotextile, a polymer modified bentonite particle layer, a third layer of non-woven geotextile, a lower layer of three-dimensional geotextile drainage network and a fourth layer of non-woven geotextile which are sequentially arranged from top to bottom; the roadbed structure comprises a pavement structure layer, a roadbed, a composite liner partition layer and an embankment which are sequentially laid from top to bottom, and slope protection ways and drainage ditches are arranged on the two sides of the roadbed structure. Through the bentonite particle impermeable layer in the composite liner separation layer, infiltration of surface water can be prevented, and rising of capillary water and migration of water and salt under the action of temperature gradient can also be blocked; slope protection and drainage ditches are designed on the two sides of the roadbed, smooth salt and water drainage of the roadbed is guaranteed, and the risk of roadbed settlement caused by migration and uneven distribution of water and salt in the salinized soil roadbed is reduced.

The invention relates to the technical field of soil improvement materials, and provides a soil heavy metal pollution repairing agent based on biomass power plant ash, which mainly comprises surface modified porous biomass power plant ash, polymer modified bentonite, a soil modified repairing agent and clay minerals. The surface modified porous biomass power plant ash is obtained through gamma-aminopropyltriethoxysilane and humic acid modified porous biomass power plant ash clustering, and the polymer modified bentonite is bentonite modified by acrylic acid and sodium carboxymethyl cellulose through a polymerization reaction. The preparation method comprises the steps of pretreatment of biomass power plant ash, liquid nitrogen freezing, freeze drying, porous structure formation, surface modification and the like. The components are mixed, granulated and molded, so that the obtained remediation agent can effectively reduce the bio-availability of heavy metals in soil, reduce the heavy metal absorption of crops and improve the soil environment quality.

The invention discloses an iron-based composite binder for pelletizing of iron ore difficult to pelletize and a pelletizing method of the iron ore difficult to pelletize, and belongs to the technical field of pellet production. The iron-based composite binder comprises fine-grained magnetite concentrate, bentonite, humic acid, sodium carboxymethyl cellulose, borax and the like, the iron-based composite binder is prepared into slurry, the slurry is added into pellet raw materials containing iron ore difficult to pelletize to be mixed and pelletized, obtained green pellets are subjected to heat treatment, and finished pellets are obtained. According to the method, the use amount of the binder is obviously reduced, meanwhile, the proportion of the iron ore difficult to pelletize in the pellet raw materials can be increased, green pellets and finished pellets meeting the requirements are obtained, the iron grade of the pellets is guaranteed, the production cost of iron and steel enterprises is reduced, and energy conservation and emission reduction of the iron and steel industry are facilitated.

The invention relates to the technical field of architectural ceramics, in particular to a gangue-doped ceramic tile and a preparation method thereof.The gangue-doped ceramic tile comprises a green body layer, a ground coat layer, a decorative layer and a glazed layer which are sequentially arranged from bottom to top; the green body layer is prepared from the following raw materials in percentage by mass: 6 to 12 percent of bentonite, 1 to 5 percent of Qingshan soil, 3 to 6 percent of polishing mud, 6 to 12 percent of waste brick powder, 4 to 8 percent of green gangue, 5 to 15 percent of chinastone, 20 to 30 percent of feldspar, 1 to 3 percent of recycled blank material, 2 to 5 percent of snail mountain soil, 8 to 15 percent of sandstone, 3 to 6 percent of washed white mud, 5 to 15 percent of coal gangue and 2 to 5 percent of grey gangue; the chemical components of the polishing mud, the waste brick powder, the recycled blank material and the coal gangue respectively comprise SiO2, Al2O3, Fe2O3, TiO2, CaO, MgO, K2O and Na2O. According to the gangue-doped ceramic tile and the preparation method thereof, the raw materials of the green body layer are improved, so that the firing temperature is reduced, the firing period is shortened, low-temperature fast firing is realized, and meanwhile, the production cost is low, the antifouling property is excellent, and the strength is high.

The invention discloses an anti-seepage, water-locking and fertilizer-retaining sandy land soil conditioner, and relates to the technical field of sandy land soil improvement, the anti-seepage, water-locking and fertilizer-retaining sandy land soil conditioner comprises the following raw materials by mass: 50-60% of decomposed cow dung; 15 to 20% of modified straw fiber; 12 to 15% of a sodium carboxymethyl cellulose solution with a concentration of 0.1%; 3 to 5% of bentonite; 1-2% of a microbial agent; 0-15% of a slow-release compound fertilizer; 0.5-1% of polyglutamic acid; and 0.5-1% of a stone-chitosan coating agent. The invention also discloses a preparation method of the anti-seepage, water-locking and fertilizer-retaining sand soil conditioner. The preparation method comprises the following steps: step 1, straw modification; step 2, cow dung decomposition; step 3, preparing a colloidal solution; step 4, mixing and granulating; step 5, coating treatment; and step 6, post-processing. By adopting agricultural wastes as main raw materials, resource utilization of the wastes is realized, and a biodegradable material is introduced to replace synthetic resin, so that the degradation period is shortened to 18-24 months.

The invention belongs to the technical field of crystallizer casting powder, and provides crystallizer casting powder for medium carbon steel and a preparation method of the crystallizer casting powder. The crystallizer casting powder comprises the following raw materials: 20-40 parts of wollastonite, 20-40 parts of magnesium slag, 2-6 parts of quartz, 1-5 parts of bentonite, 2-6 parts of flint clay, 3-10 parts of fluorite, 1-3 parts of sodium carbonate, 1-2 parts of manganese carbonate, 3-7 parts of boron glass powder, 2-4 parts of magnesia powder, 6-10 parts of a carbon material and 2-4 parts of a modified binder. The crystallizer casting powder disclosed by the invention is reasonable in proportion of chemical components, has proper melting speed and viscosity, effectively ensures the thickness of a liquid slag layer, and can be uniformly consumed, so that the continuous casting process is ensured to be carried out smoothly, and the quality defects of corner cracks, narrow edge bulging, corner transverse cracks and the like of a medium carbon steel casting blank are avoided.