19results about How to "Reduce leaching" patented technology

The invention relates to the technical field of fertilizer preparation, and particularly discloses a modified flotation phosphate tailing-based composite calcium magnesium phosphate fertilizer and a preparation method thereof, and the composite calcium magnesium phosphate fertilizer is prepared from modified flotation phosphate tailings, dolomite, limestone, an activator, a binder, a magnesium supplement conditioner and water. The flotation phosphate tailings are deeply modified by adopting a composite pretreatment liquid synergistic activation-gradient composite modification process, so that the effectiveness of nutrients such as phosphorus, calcium and magnesium in the flotation phosphate tailings and the environmental safety are remarkably improved; and through the raw material compounding design of calcium and magnesium source collaboration, gradient magnesium supplementation and conditioning synergism, quick-acting and long-acting collaborative supply of nutrients and a soil improvement function are realized. The flotation phosphate tailings are used as main raw materials, the technological process is simple, energy consumption is low, the prepared composite calcium magnesium phosphate fertilizer is balanced in nutrient, lasting in fertilizer efficiency and excellent in physical performance, and unification of solid waste recycling, product high value and production greenization is achieved.

This invention discloses a slow-release fertilizer suitable for lateritic soils in Hainan, comprising a fertilizer core and a coating layer; the fertilizer core comprises the following raw materials in parts by weight: 10-20 parts isobutylene diurea, 1-3 parts 3,4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts dicyandiamide DCD, 20-30 parts humic acid, and 30-50 parts organic fertilizer; the coating layer comprises the following raw materials in parts by weight: 5-10 parts natural nanotube halloysite, 3-5 parts bentonite, 5-10 parts cyclodextrin, 1-3 parts polyglutamic acid, 1-3 parts wood vinegar, and 5-10 parts polyacrylamide. The isobutylene diurea, humic acid, and organic fertilizer of this invention can effectively replenish organic matter and nitrogen in iron-aluminate soil, maintain soil nitrogen levels, and effectively control the conversion of ammonium nitrogen to nitrate nitrogen in lateritic soil, thereby reducing nitrogen loss and achieving a stable supply of nitrogen. In addition, polyglutamic acid and polyacrylamide have strong water retention capacity, and the fertilizer core is coated with a coating layer to achieve slow release and water retention.

This invention discloses a method for preparing and applying chitosan-encapsulated CoCe layered double hydroxide CoCe-LDH. This material can achieve rapid and efficient degradation of roxarsone and removal of the resulting inorganic arsenic. In this material, LDH is encapsulated by chitosan, resulting in a sheet-like material. Chitosan can disperse active sites and adsorb and enrich PMS, while LDH can transfer PMS ions into the anion layer through anion exchange, thereby increasing the active sites. After coupling with the material, PMS is specifically converted to... 1 O2 accelerates the degradation rate.

The application relates to a binder applied to mine slag adhesion, which comprises the following components: 65-70 parts of mine slag, 8-12 parts of calcium aluminate cement, 3-5 parts of mine powder, 2-3 parts of phosphorus powder, 1.5-2.5 parts of water glass, 0.8-1.2 parts of sodium hydroxide, 0.6-0.8 parts of a retarder, and 2-5 parts of an alkaline additive; the alkaline additive comprises modified calcium hydroxide, sodium silicate and sodium carbonate; the modified calcium hydroxide comprises calcium hydroxide and sodium polyphosphate. The application has the effects of improving the cement solidification and adhesion performance, reducing heavy metal ion seepage, and improving the utilization rate of mine slag.

Relating to the technical field of solid waste resource utilization, the invention discloses a waste incineration fly ash cold bonding aggregate granulation device, which comprises a shell assembly, a center driving and liquid distribution system, a feeding and diversion system, a supergravity reaction rotor, an edge granulation mechanism, a bottom maintenance discharge system and a gas phase and sensing system. Fly ash materials are conveyed and smashed through the feeding and guiding system, then supergravity carbonization and chelating spraying treatment are carried out through the center driving and liquid distributing system, the supergravity reaction rotor and the gas phase system, after fly ash slurry is formed, extrusion compact forming is carried out through the edge granulation mechanism, and the fly ash slurry is obtained. And the formed cold bonding aggregate is cured by the bottom curing and discharging system and then is discharged from the star-shaped discharging valve. According to the method, efficient chemical reaction under a high gravity field and high-strength physical extrusion forming are organically combined, the problems that in the prior art, the carbonization rate is low, the aggregate strength is low and the leaching risk is high are solved, and the high-density and low-leaching fly ash based road aggregate is continuously prepared through a one-step method.

The application discloses a method for inhibiting leaching of impurity aluminum ions in ionic rare earth ore, and belongs to the technical field of rare earth ore mining. S1, according to the rare earth content in the ore body, a leaching agent is configured; S2, a buffer is added to the step S1 to configure a composite leaching agent; S3, the composite leaching agent in the step S2 is added to the ore body for leaching; S4, the buffer in the step S2 is configured into a buffer solution with the same pH buffering capacity as the composite leaching agent; S5, after the composite leaching agent in the step S2 is added completely, the buffer solution in the step S4 is continuously added to the ore body until the leaching is completed; the composite leaching agent containing a specific buffer is configured, the pH value of the leaching solution in the leaching process is stably controlled within the range from 4.8 to 5.4; under the pH condition, aluminum ions can form aluminum hydroxide precipitate colloid and are adsorbed in the ore body, while rare earth ions can still stably exist in the leaching solution, so that in-situ separation of the rare earth and the aluminum ions in the leaching stage is realized.

This invention discloses a pH-responsive slow-release calcium fertilizer compatible with potassium dihydrogen phosphate and its preparation method, belonging to the field of agricultural fertilizer technology. Each liter of the slow-release calcium fertilizer comprises the following components: 1000-1200 g of calcium nitrate tetrahydrate; 50-100 g of small peptide amino acid solution, wherein the free amino acid content in the small peptide amino acid solution is not less than 100 g / kg, and the small peptide amino acid content is not less than 330 g / kg; 60-100 g of erythritol; 3-10 g of sodium alginate; 10-50 g of citric acid; 10-40 g of mannitol; appropriate amount of triethanolamine for adjusting the pH value to 4.5-5.8; and water to a final volume of 1 L. This invention also provides a method for preparing the calcium fertilizer. This calcium fertilizer, through a unique synergistic stabilizing system of erythritol-small peptide-weak acid, not only can be mixed with potassium dihydrogen phosphate without precipitation, solving the problem of calcium-phosphorus antagonism, but also possesses pH-responsive release characteristics, intelligently releasing calcium ions in the acidic environment of plant rhizosphere, significantly improving calcium absorption and utilization.

The application provides a preparation method for improving the gel performance of sturgeon myofibrillar protein, and belongs to the technical field of food processing.The preparation method for improving the gel performance of sturgeon myofibrillar protein provided by the application comprises the following steps: extracting myofibrillar protein in sturgeon meat to obtain a sturgeon myofibrillar protein solution; performing ultrasonic treatment and malondialdehyde induction treatment on the sturgeon myofibrillar protein solution to obtain a composite myofibrillar protein; performing dialysis on the composite myofibrillar protein to obtain a modified protein solution; and performing heat induction on the modified protein solution to obtain sturgeon myofibrillar protein gel.The preparation method can effectively improve the water retention and energy storage modulus of the sturgeon myofibrillar protein gel, so that the water retention capacity and deformation resistance of the gel are significantly enhanced, and the application of the sturgeon myofibrillar protein in gel-based products has an important role.

This invention provides a highly efficient method for treating red mud using a combined acid-base method, relating to the field of comprehensive utilization of red mud. The method uses industrial byproducts hydrochloric acid and sodium hydroxide as leaching agents. Through a step-by-step process—red mud pretreatment, acid leaching for silicon removal, ammonia production and silicon fertilizer preparation, iron powder reduction for titanium extraction and neutralization of the acid leaching solution with ammonia, alkaline leaching for iron and aluminum separation, and the harmless recycling of red mud—it achieves precise separation and recovery of valuable metals such as titanium, iron, and aluminum from red mud. Simultaneously, it completes the production of silicon fertilizer from silicon tailings, the closed-loop recycling of alkaline resources, and the harmless treatment of red mud. This invention solves the technical problems of low resource recovery efficiency, high equipment costs, severe secondary pollution, and high carbon emissions associated with traditional red mud treatment processes. It achieves the resource utilization of all components of red mud, with no wastewater or waste residue discharge. The iron concentrate grade is ≥65%, the titanium concentrate grade is ≥95%, and the sodium aluminate solution can be reused in aluminum plant production lines. The reagent consumption cost per ton of red mud is reduced to below 40 yuan, making it valuable for large-scale industrial application.

The application discloses a method and device for catalytic leaching of argillaceous uranium ore based on ozone, and relates to the technical field of uranium leaching and reaction equipment. The application utilizes biomass raw materials and iron-based material powder to prepare a magnetic composite material with catalysis-adsorption dual functions through in-situ reduction by high-temperature heat treatment. The slurry of argillaceous uranium ore and the magnetic composite material are mixed in a reactor for reaction. Ozone is introduced through an aeration disc to avoid bubble aggregation, significantly increase the gas-liquid contact area, and improve the ozone utilization rate. A spiral guide plate is arranged in the reactor to effectively prolong the gas-liquid contact time and improve the ozone mass transfer efficiency. A magnetic recovery device is used to recover the magnetic material to ensure the catalyst activity, reduce the catalyst loss rate, and realize efficient catalysis. Through optimization of the reactor structure, the catalyst preparation process and the process flow, the ozone utilization rate and the leaching efficiency of the argillaceous uranium ore are significantly improved, and the catalyst recycling and the recycling of residual gas are realized.

The application discloses a preparation method of pharmaceutical-grade glacial acetic acid. It belongs to the technical field of fine chemical industry. The method uses bio-based ethanol as raw material, and performs catalytic oxidation reaction with oxygen in a reaction rectifying tower under the action of a multifunctional composite ionic liquid catalyst designed by the application. After the reaction, the crude acetic acid liquid is purified by specific molecular sieve adsorption and multi-stage low-temperature gradient crystallization in sequence. The core of the application lies in catalyst design: by utilizing the "template effect" of acetate anions and the synergistic effect of palladium-ruthenium bimetallic nanoclusters, the application realizes the ultrahigh selectivity (>99.8%) and ultralong catalytic stability of ethanol to acetic acid under mild conditions. The integrated process avoids halogen and heavy metal pollution from the source, the product purity is greater than or equal to 99.99%, the content of key impurities (formic acid, propionic acid) is reduced by 1-2 orders of magnitude compared with traditional processes, and the energy consumption is significantly reduced. Therefore, the application is an efficient and pharmaceutical glacial acetic acid preparation path.

The invention discloses a preparation method of a coordination polymer containing CuII and research on the inhibition effect of the coordination polymer on soil urease and nitrifying bacteria, and relates to the technical field of fertilizer.The preparation method comprises the steps that 3-aminopyridine and fumaric acid serve as raw materials to synthesize N1, N4-bis (3-pyridyl)-2-butenamide, then CuCl2. 2H2O and the synthesized N1, N4-bis (3-pyridyl)-2-butenamide are used for preparing the coordination polymer containing CuII. The novel coordination polymer [Cu (3-bbpa) (5-HIPA). H2O] is synthesized from N, N, N, N ', N'-bis (3-pyridyl)-2-butenamide and 5-hydroxyisophthalic acid by a hydrothermal method, and the crystal structure of the novel coordination polymer [Cu (3-bbpa) (5-HIPA). H2O] is analyzed to research the influence of the novel coordination polymer as an inhibitor on soil urease and nitrifying bacteria. The difunctional inhibitor is studied to delay the conversion process of urea from urea nitrogen to ammonium nitrogen and ammonium nitrogen to nitrate nitrogen, overcomes the defect of single inhibition capability of a traditional inhibitor, is strong in inhibition capability, low in toxicity, low in cost and simple in synthesis method, can effectively improve the utilization rate and stability of the fertilizer urea, and has a wide application prospect. Nitrogen loss in agricultural activities is reduced, the fertilization cost is reduced, and the grain yield is increased.

The invention relates to the technical field of agricultural cultivation, and discloses a space-time nitrogen application method for wine grapes, which comprises the following steps: S1, before germination of the wine grapes, performing soil fertilization, and applying nitrogen fertilizers such as urea and the like; s2, preparing a leaf fertilizer with soluble nitrogen fertilizer such as urea as solute, wherein the concentration is not more than 0.3%; s3, adding an auxiliary agent into the leaf fertilizer; s4, in the morning or evening, the leaf fertilizer is sprayed to leaves of the wine grapes; s5, in a key growth period of the wine grapes, foliage spraying is carried out for three times, and the interval between two adjacent spraying is not less than 9 days. According to the method, the situation that nitrogen is sprayed outside the roots of the wine grapes in the fruit setting period is proposed for the first time, the utilization efficiency of the nitrogen is remarkably improved, and meanwhile the expropriation capacity of the wine grape fruits on the nitrogen fertilizer and the content of nitrogen assimilated by yeast are remarkably improved.

The application discloses a treatment method of fly ash solidified by oil-based rock debris desorption residues and a fly ash solidified body, and comprises the following steps: uniformly stirring fly ash and oil-based rock debris desorption residues to obtain a mixture in an adsorption state; adding a heavy metal chelating agent and a soluble salt complexing and cementing agent into the mixture in sequence to obtain a stabilized mixture; and adding cement, stones and water into the stabilized mixture in sequence, uniformly stirring and solidifying to obtain the fly ash solidified body. The application reduces the solidification cost, strengthens the stable solidification treatment of pollutants, improves the compressive strength after solidification, and reduces the lead leaching amount and the total amount of soluble salts.

This invention discloses a nitrogen-carbon-containing aluminum iron boride composite material, its preparation method and application. The nitrogen-carbon-containing aluminum iron boride composite material has the characteristics of high catalytic efficiency, low leaching, easy recovery and high stability, and has considerable application potential in activated persulfate advanced oxidation systems.

The present application relates to the technical field of phosphogypsum building new material production, in particular to a phosphogypsum harmless treatment device, a treatment process and application thereof, the device comprising an aggregate bin, a powder bin, a powder mixer, a conveyor, a mixing blender, a discharge bin and a reservoir, and a phosphogypsum solidified body bin, a phosphogypsum solidification and air drying all-in-one machine, and a phosphogypsum raw material crusher, the device with the above structure is needed to realize the harmless treatment of phosphogypsum, the crushing and harmless treatment processes of phosphogypsum are added to the existing mixing station, the phosphogypsum raw material crusher and the phosphogypsum solidification and air drying all-in-one machine are arranged in the treatment device to crush and harmlessly treat the phosphogypsum, so that the phosphogypsum can be uniformly mixed with other building materials to improve the product quality, and the phosphogypsum harmless treatment process is designed, the material formed by the process forms a complete new technology which can be popularized from manufacturing to application, and achieves the application performance of industrialization and scaling.

The present application belongs to the technical field of heterogeneous catalytic materials and its preparation and application, and particularly relates to a heterogeneous photo-Fenton iron monatomic catalyst, a preparation method and application thereof. The catalyst is composed of a graphite-like carbon nitride carrier containing sulfur doping and iron monatomic combined with the carrier, wherein the mass fraction of iron element in the catalyst is 0.1-3.0 wt.%. The preparation of the catalyst includes a sulfuric acid-induced precursor self-assembly process and an in-situ pyrolysis process, which is low in raw material cost, simple in operation, low in equipment requirement, environmentally friendly and can be popularized on a large scale. The highly dispersed Fe atomic catalytic active sites in the catalyst form stable chemical bonds with the sulfur-doped carbon nitride carrier with a porous structure, which not only improves the metal utilization rate, but also solves the problems of metal agglomeration and ion leaching. The catalyst can form an efficient photo-Fenton catalytic system in a low-concentration hydrogen peroxide solution, realizes efficient and rapid degradation of various kinds of organic pollutants, and has a broad application prospect.

The invention relates to an intelligent water and fertilizer precise drip irrigation regulation and control method for cotton in saline-alkali soil, and belongs to the technical field of precise agriculture. According to the method, accurate regulation and control of the whole growth cycle of the cotton are achieved through three-in-one technology integration of accurate seedling erecting and population construction, water and fertilizer integrated collaborative management and informatization intelligent decision making. The core technology comprises wide-narrow row precision seeding and density optimization configuration based on soil fertility difference, a dynamic fertilization strategy of'front control, middle promotion and rear supplement ', intelligent drip irrigation control based on soil moisture content and a crop water demand model, and a growth and development monitoring and decision support system based on multi-source information fusion (unmanned aerial vehicle remote sensing and ground Internet of Things). According to the method, the problems of low water and fertilizer utilization rate, unreasonable group structure and management link splitting in traditional cotton field management are solved, water can be saved by 30%-40%, fertilizer can be saved by 20%-30%, the boll forming rate can be increased by 15% or above, the fiber quality is remarkably improved, and economic benefits and ecological benefits are in synergistic interaction.

The invention provides a multi-layer composite polypropylene infusion film and a preparation method thereof. The multi-layer composite polypropylene infusion film sequentially comprises an inner layer, a middle layer and an outer layer from inside to outside, wherein the outer layer comprises polyolefin, an elastomer and a first block copolymer; the middle layer comprises ethylene-propylene binary polypropylene random copolymer, a cycloolefin polymer, carbon black master batch and a second block copolymer; and the inner layer comprises ethylene-propylene-butylene ternary random copolymer polypropylene. According to the present invention, with the multilayer structure arranged in the stacking manner and the cooperation of the components of each layer, the transfusion film has advantages of excellent gas and water vapor barrier property, low precipitation property and high safety, and can meet the requirements of the transfusion film on the tensile strength, the heat sealing strength and the like.