237 results about "Diammonium phosphate" patented technology

The invention provides a method for recycling a waste lithium iron phosphate battery positive electrode material based on organic solvent soaking. The method comprises the following steps: mixing waste lithium iron phosphate positive electrode material powder and a crown ether chelating type co-dissolving agent to obtain a leaching solution; hydrogen peroxide is added into the leachate, the pH is adjusted, a diammonium hydrogen phosphate solution is added, and iron phosphate and filtrate containing lithium ions are obtained; adding sodium carbonate into the filtrate containing lithium ions, and adjusting the pH value to obtain lithium carbonate; mixing the iron phosphate with a phosphoric acid solution to obtain purified iron phosphate; and mixing the purified iron phosphate, lithium carbonate and acetylene black to obtain the regenerated lithium iron phosphate positive electrode material. According to the method for recycling the positive electrode material of the waste lithium iron phosphate battery based on soaking of the organic solvent, the leaching rate of the lithium element is effectively increased, the selectivity to other metal ions is low, and the regenerated positive electrode material of the lithium iron phosphate battery has relatively high discharge capacity and good cycling stability.

The invention relates to the technical field of fertilizers, and discloses a slow-release coated fertilizer and a preparation method thereof. Comprising the following raw materials in parts by weight: 57 to 77.6 parts of urea, 14.25 to 24.25 parts of diammonium phosphate, 0 to 5 parts of calcium superphosphate, 4.75 to 14.55 parts of potassium chloride, 0.03 to 0.2 part of chitosan, 0.0075 to 0.05 part of nano silicon dioxide, 0.001 to 0.015 part of glutaraldehyde, 2.96 to 4.94 parts of deionized water, 0.01 to 0.1 part of bacillus subtilis, 0.05 to 0.2 part of mesoporous silicon dioxide loaded nano selenium and 0.5 to 1 part of potassium fulvate. Chitosan, nano silicon dioxide and glutaraldehyde are matched with one another, and chitosan has pH responsiveness, so that the problems that a coating layer of a traditional slow-release fertilizer is prone to being affected by the environment and broken in advance, nutrients are rapidly released, and the slow-release effect is reduced are solved.

The invention discloses a decay-promoting and carbon-retaining agent and a preparation method, application and a verification method thereof. The decay-promoting and carbon-retaining agent comprises a complex microbial inoculant and a nutrient preparation, the complex microbial inoculant comprises the following substances in parts by weight: 2 parts of aspergillus oryzae, 4 parts of saccharomyces cerevisiae, 3 parts of bacillus subtilis, 2 parts of lactic acid bacteria, 4 parts of Koxime saccharomycetes, 3 parts of acetobacter aceti, 4 parts of aspergillus candidus, 1 part of deuteromycetes and 1 part of arthrobacter; the nutrient preparation comprises the following substances in parts by weight: 5 parts of urea, 2 parts of diammonium phosphate and 1.3 parts of potassium sulfate. According to the method, the method for verifying the effect of mixed application of the straw and the decay-promoting and carbon-retaining agent to the soil is constructed, and the 13C isotope tracing technology is combined to verify the SOC immobilization effect of the decay-promoting and carbon-retaining agent on the soil with different textures, so that the situation that the decay-promoting and carbon-retaining agent with different components can achieve more effective SOC immobilization on the soil with the different textures is obtained, and straw resources are fully utilized.

The present invention discloses a livestock and poultry manure biochar-based fertilizer, comprising the following raw materials in parts by weight: 10-42% of dilute protein solution and collagenase-modified livestock and poultry manure biochar, 20-40% of urea, 7-25% of diammonium phosphate, 7-24% of potassium chloride or potassium sulfate, 0.5-1% of modified starch, and 6-23% of bentonite. The livestock and poultry manure is selected from one of chicken manure, cow manure, and pig manure. After the biochar is modified with collagenase, the surface of the biochar has more phenolic hydroxyl groups, carboxyl groups, aldehyde groups, and hydroxyl functional groups, which are effective for NH4 + , PO4 3‑ , K + , has a stronger adsorption effect, collagenase modification makes the protein distribution more uniform, and the generated groups form a stable chemical bond with the biochar surface: it improves the dispersibility of the modified biochar in aqueous solution and reduces agglomeration; it has better chemical stability in acidic and alkaline environments.

The invention relates to the field of photovoltaic cells, and particularly discloses low-temperature cured copper paste and a preparation method and application thereof. The copper paste is prepared from the following raw material components in parts by weight: 85 to 95 parts of copper powder, 2 to 8 parts of a carrier, 2 to 5 parts of a solvent, 0.1 to 3 parts of a curing agent, 0.01 to 0.05 part of an accelerant, 0.5 to 1.5 parts of zinc borate, 0.1 to 0.5 part of nickel nitrate, 0.05 to 0.15 part of ethylenediamine, 0.05 to 0.15 part of diammonium hydrogen phosphate and 0.1 to 0.3 part of citric acid, wherein the purity of the copper powder is 99%-99.9%. The preparation method of the low-temperature cured copper paste comprises the following steps: respectively adding the curing agent, the accelerant, the solvent, the zinc borate, the nickel nitrate, the ethylenediamine, the diammonium hydrogen phosphate, the citric acid and other raw materials into the carrier, uniformly stirring and mixing, then adding the copper powder, mixing and stirring, grinding, and stirring to obtain the low-temperature cured copper paste.

The preparation method comprises the following steps: shredding a light fibrous plant raw material which is difficult to process to 1-5mm, adding a certain amount of lignin, fully mixing with diammonium hydrogen phosphate or ammonium dihydrogen phosphate, carrying out hot press molding at 130-190 DEG C by using a pelletizer to prepare heavy particles with the particle size of 8-10mm, and carrying out high-temperature sintering to obtain the columnar activated carbon for desulfurization and denitrification of the fibrous plant raw material, thereby obtaining the columnar activated carbon for desulfurization and denitrification of the fibrous plant raw material and the columnar activated carbon for desulfurization and denitrification of the fibrous plant raw material. Heating the heavy particles to 400-700 DEG C in a rotary furnace, carbonizing for 1-3 hours, introducing a mixed gas of water vapor and air, and carrying out segmented activation at 850-950 DEG C-1000 DEG C to prepare high-quality activated carbon with the iodine value of more than or equal to 950 mg / g; crushing activated carbon to 140-325 meshes, mixing the crushed activated carbon with the composite glue solution, adding a proper amount of water for kneading, and forming the mixture into 2-8mm columnar particles by a hydraulic granulator or a screw extrusion granulator; through drying at the temperature of 100-300 DEG C and heat treatment at the temperature of 700-900 DEG C in a nitrogen, water vapor or anaerobic atmosphere, a basic group generated by the binder in the heat treatment has a very strong chemical adsorption effect on acid gas, later-stage modification is not needed, and excellent desulfurization and denitrification performance is achieved.

The invention discloses a formula and a preparation process of a synthetic biotechnology-based endowed netting loss-control pesticide fertilizer, and relates to the technical field of fertilizers, the loss-control pesticide fertilizer is prepared from the following components by weight: 60-80 parts of a compound fertilizer, 10-20 parts of diammonium phosphate, 2-10 parts of trace elements, 2-8 parts of modified attapulgite, 1-4 parts of an insecticide, 0.5-3 parts of polyglutamic acid, and 1-5 parts of polyvinyl alcohol; according to the invention, a high-efficiency netting loss control system is formed through the energization of polyglutamic acid and the synergistic effect of multiple components, so that not only are the problems of easy nutrient loss and poor pesticide stability in the traditional pesticide fertilizer solved, but also the synergistic slow release of nutrients and pesticide is realized, the utilization rate of the fertilizer is remarkably increased, the control period of the pesticide is remarkably prolonged, and the application value is good.

The present invention belongs to the technical field of phosphate fertilizer production, and specifically relates to a zinc-containing diammonium phosphate, a preparation method thereof, and a fertilizer containing zinc-containing diammonium phosphate. Zinc-containing diammonium phosphate is prepared by coating elemental sulfur on the outer layer of solid zinc fertilizer to obtain a sulfur-containing zinc mixed slurry, which is then sprayed onto the diammonium phosphate for granulation to obtain the zinc-containing diammonium phosphate. The amount of solid zinc fertilizer added accounts for 30 to 100% of the total mass of elemental sulfur; and the amount of sulfur-containing zinc mixed slurry added is 1 to 10% based on the total weight of the zinc-containing diammonium phosphate. This preparation method avoids direct contact and antagonistic reactions between phosphate and zinc ions, prevents degradation of phosphorus and zinc nutrients, and maintains a good ratio of water-soluble zinc content and water-soluble phosphorus content.

The present invention provides a composite insecticide containing plant extracts and its preparation process, belonging to the technical field of pesticide preparation; the preparation process includes the following steps: preparing a composite carrier powder; preparing a modified composite carrier powder; preparing a Corydalis extract; preparing a composite insecticide. By first dispersing nano-calcium carbonate powder in deionized water, then adding a mixed solution of calcium nitrate solution and diammonium hydrogen phosphate solution, and carrying out a hydrothermal reaction to prepare a composite carrier powder of nano-calcium carbonate and hydroxyapatite, after loading the Corydalis extract and veratridine with this composite carrier powder, the prepared composite insecticide can have a slow-release effect, extend the insecticidal action time, reduce the number of pesticide applications, and reduce environmental pollution. In addition, after modifying the composite carrier powder, its loading rate for the Corydalis extract and veratridine can be improved, thereby enhancing the insecticidal effect of the composite insecticide.

The invention discloses heat-resistant ammonium polyphosphate with ultrahigh polymerization degree and a synthesis method thereof. The method comprises the following steps: (1) preparing ammonium polyphosphate: S1, mixing phosphorus pentoxide and diammonium hydrogen phosphate, stirring to react, and introducing ammonia gas to react; s2, mixing phosphoric acid with melamine for reaction, supplementing phosphoric acid, and stirring for reaction; s3, when the temperature in the first-step reaction is 280-300 DEG C, stopping introducing the ammonia gas, adding a product obtained in the step S2, supplementing diammonium hydrogen phosphate, and introducing the ammonia gas to continue the reaction; (2) end sealing; (3) pre-curing; and (4) mixing and dissolving epoxy resin and a curing agent, and then coating the surface of the pre-cured ammonium polyphosphate with the mixture. The initial polymerization degree of the ammonium polyphosphate can be improved, the initial molecular weight of the ammonium polyphosphate is higher, the application capacity of the ammonium polyphosphate in a humid and hot environment can be improved after modification treatment, especially when the ammonium polyphosphate is soaked in hot water at the temperature of 80 DEG C for 4 h, the product does not separate out or migrate, and the stability of the flame-retardant effect of the product is guaranteed.

The invention belongs to the technical field of agriculture, and particularly relates to a fertilization method for improving the quality and yield of oat seeds, diammonium hydrogen phosphate and biochar are used as base fertilizers, the application amount of the diammonium hydrogen phosphate is 10-12 kg / mu, the application amount of the biochar is 10-15 kg / mu, bacterial fertilizer dressing is carried out in the seedling emergence period of crops, and chemical fertilizer dressing is not carried out in the later period; the bacterial fertilizer is an arbuscular mycorrhizal fungus inoculant and a trichoderma inoculant. The use amount of the chemical fertilizer is reduced, and the negative effect of excessive use of the chemical fertilizer on crop growth is reduced; the soil environment is improved by additionally applying biochar, and the nutrient utilization efficiency is improved; by utilizing a hypha network formed by arbuscular mycorrhizal fungi and root systems, the absorption area of the oat root systems is increased, and the nutrient utilization efficiency of plants is improved; the application of the trichoderma can promote the development of lateral roots of plants and accelerate the growth speed of the plants in the seedling stage; the fertilization method can improve the quality and yield of the oat seeds, is simple and easy to implement, is suitable for large-scale popularization and application, and has a wide market prospect.

The invention relates to the technical field of surface strengthening treatment and coating preparation, in particular to a micro-arc oxidation electrolyte, a preparation method of the micro-arc oxidation electrolyte and a preparation method of an oxide ceramic coating on the surface of a magnesium-copper dissimilar metal material component. The invention provides a micro-arc oxidation electrolyte. The micro-arc oxidation electrolyte comprises a main film-forming agent, an arcing aid, a pH regulator, a corrosion inhibitor and water, the main film-forming agent comprises ammonium fluozirconate and / or potassium fluozirconate; the arcing aid comprises one or more of disodium hydrogen phosphate, sodium dihydrogen phosphate, ammonium dihydrogen phosphate and diammonium hydrogen phosphate; the corrosion inhibitor comprises one or more of hexamethylenetetramine, ammonium bifluoride and triethanolamine. The micro-arc oxidation electrolyte breaks through the problem that valve metal and non-valve metal cannot be subjected to arc discharge at the same time for micro-arc oxidation treatment in the micro-arc oxidation process.

The invention belongs to the technical field of saline-alkali soil improvement and crop planting, and particularly relates to a method for saline-alkali soil improvement and oat planting, which comprises the following steps: sowing mixed bean green manure crops in April every year, and scattering diammonium phosphate into ploughed soil before sowing; the mixed bean green manure is common vetch and S001 wild soybean; turning, pressing and returning to the field in a green manure full-bloom stage; the oats are planted every 15 days, and before the oats are planted, charcoal is scattered into the ploughed soil; the method comprises the following steps: selecting a saline-alkaline tolerant feeding oat variety, and cradling in a heading period. By sowing the mixed bean green manure, the soil composition of the saline-alkali soil can be effectively improved, the pH value of the soil and the total amount of water-soluble salt are reduced, and the content of total nitrogen, available phosphorus, quick-acting potassium and organic matter is remarkably increased, so that the method is suitable for oat planting; by sowing mixed bean green manure, turning, pressing and returning the mixed bean green manure to the field and applying biochar base fertilizer, the plant height and the yield of the oats are remarkably increased; the method is simple, effective, low in cost and suitable for large-scale popularization and application.

The invention provides a deodorant for air disinfection and deodorization and a preparation process thereof, and belongs to the technical field of air purification. Comprising the following components: a composite deodorizing material, a composite essential oil microcapsule, a surfactant, benzalkonium bromide and water. The preparation method comprises the following steps: mixing and dissolving calcium nitrate tetrahydrate and diammonium hydrogen phosphate, adding hexadecyl trimethyl ammonium bromide and ammonia water to prepare a mesoporous nano-hydroxyapatite precursor suspension, adding a zinc nitrate solution, and carrying out hydrothermal reaction and calcination to prepare a composite carrier material; when the composite essential oil is loaded into the composite carrier material by using a vacuum impregnation method, the composite essential oil can have a slow release effect, the long-acting deodorization effect of the deodorant is improved, and more adsorption sites can be provided for the composite essential oil, so that the loading rate of the composite carrier material to the composite essential oil can be remarkably improved, and the deodorization effect of the deodorant is improved. The deodorization effect of the deodorant is further improved.

The invention relates to the technical field of agricultural fertilizers, in particular to a slow / controlled-release fertilizer for saline-alkali soil and a preparation method of the slow / controlled-release fertilizer. The slow / controlled-release fertilizer sequentially comprises a core layer, an inner coating, a shell layer and an outer coating from inside to outside, the core layer comprises a functional aid, diammonium hydrogen phosphate, urea, isobutylidene diurea, potassium nitrate and biochar; a shell layer contains bagasse, a compound strain and fulvic acid; the coating material is an adhesive containing montmorillonite powder; the functional additive is loaded with an organic acid and polymethacrylamide network through modified diatomite, so that the synergistic effect of sodium ion adsorption, acid-base regulation and nutrient slow release is realized; through the multi-layer structure design and the component synergistic effect, it is guaranteed that the slow and controlled release fertilizer can improve the saline-alkali soil structure in a long-acting mode, accurately regulate nutrient release and improve the stress resistance of crops, and the slow and controlled release fertilizer is suitable for efficient utilization of saline-alkali soil.

The invention relates to the technical field of antibacterial materials, in particular to a rare earth antibacterial ultraviolet-proof composite material and a preparation method thereof.The preparation method comprises the following steps that lanthanum oxide is added into a 1-2 mol / L dilute nitric acid solution, heating and stirring are conducted at the temperature of 60-80 DEG C till the lanthanum oxide is completely dissolved, a lanthanum ion solution is obtained, calcium nitrate tetrahydrate and the lanthanum ion solution are added into deionized water, a solution A is prepared, and the solution B is prepared; the preparation method comprises the following steps: adding diammonium hydrogen phosphate and a polymer carrier into deionized water to prepare a solution B, slowly dropwise adding the solution B into the solution A under magnetic stirring to obtain a turbid liquid, adjusting the pH value, stirring for 6-8 hours in an oil bath, standing and aging for 24-36 hours at room temperature, filtering to obtain a precipitate, washing and drying to obtain the rare earth antibacterial ultraviolet-proof composite material. The rare earth antibacterial and ultraviolet-proof composite material prepared by the invention has good antibacterial and ultraviolet shielding properties.

The invention discloses novel modified biochar and a preparation method and application thereof.The preparation method comprises the following steps that calcium-rich solid waste raw materials are placed in a crusher to be crushed and fully mixed with biochar with dissolved organic matter removed according to the mass ratio of 1: (1-4); adding pure water with the mass volume ratio of 1g: (60-100) mL, diammonium hydrogen phosphate with the calcium-phosphorus ratio of 1: (2.5-3.34) and ammonium dihydrogen phosphate with the calcium-phosphorus ratio of 1: (2.5-3.34); all the raw materials are placed in a ball milling tank, the mass ratio of the raw materials to zirconium oxide balls before ball milling is 1: (10-15), and ball milling is conducted for 6-12 h at the rotating speed of 250-600 r / min; transferring the biochar slurry subjected to ball milling into a centrifugal tube, and centrifuging for 10 minutes at the rotating speed of 5000 r / min; the solid precipitate is washed with pure water three times to remove excessive phosphate, the solid precipitate is placed in a drying oven to be dried, and the novel ball-milled modified biochar is obtained, the novel modified biochar is simple in synthesis method and low in energy consumption, can be easily separated through a centrifugal machine and has high adsorption performance on heavy metal.

The invention discloses a special slow-release fertilizer for wheat in saline-alkali soil as well as a preparation method and application thereof, and relates to the technical field of slow-release fertilizers. The fertilizer contains various functional substances and a microbial agent, and specifically contains the following components in parts by weight: 5-10 parts of urea, 0.5-3 parts of potassium chloride, 5-10 parts of diammonium phosphate, 2-5 parts of triple superphosphate, 0.5-1 part of magnesium sulfate, 0.5-1 part of zinc sulfate, 0.2-0.5 part of boric acid, 0.2-0.4 part of resveratrol, 0.5-1 part of alginic acid, 0.3-0.5 part of fulvic acid and 1.0 part of a microbial mixed agent, and 0.1 to 0.3 part of a surfactant. According to the fertilizer, all the raw material components are reasonably compounded, the physicochemical properties of saline-alkali soil can be effectively improved while the growth requirement of wheat in the saline-alkali soil is met, and meanwhile the utilization rate of the fertilizer can be increased through the slow release effect, and damage to the environment is reduced.

The invention relates to the technical field of extraction of rare earth elements by a biological method, and provides a biological leaching method for extracting rare earth elements in fly ash by using aspergillus niger, which comprises the following steps: adding fly ash into a culture medium, sterilizing, inoculating aspergillus niger spore suspension, culturing, filtering leachate, and drying to obtain the rare earth elements, the culture medium consists of the following components in percentage by weight: 1-2% of glucose, 0.5-1.5% of a nitrogen source and the balance of water, the nitrogen source comprises peptone, yeast extract powder and diammonium hydrogen phosphate; the mass ratio of the peptone to the yeast extract powder to the diammonium hydrogen phosphate is 5: 1: (0.05-0.5). Through the technical scheme, the problem of low extraction rate of rare earth elements in related technologies is solved.

The invention provides a trichoderma fungicide for promoting growth of allium plants and application of the trichoderma fungicide, the trichoderma fungicide is a trichoderma harzianum strain MCBC3, the trichoderma fungicide and diammonium phosphate are applied in a combined mode, the application amount of the diammonium phosphate is 15 kg / mu, and the application amount of the trichoderma fungicide is 1 L / mu; existing trichoderma resource development focuses on a normal soil environment, the trichoderma harzianum MCBC3 is screened out from the saline-alkali soil for the first time, the salt resistance and the alkali resistance of the trichoderma harzianum MCBC3 directly aim at double stress of high salt and high alkali of the saline-alkali soil, and the technical bottlenecks that a traditional strain is poor in adaptability and low in survival rate in an extreme environment are solved.

The invention discloses a high-concentration multi-element slow-release blended fertilizer which is prepared from nutrient elements, plant hormones, ammonium bicarbonate, ammonium phosphate, potassium chloride, magnesium oxide, sub-volcanic rock, kaolin, urea, bentonite, calcium oxide, compound microorganism bacteria, diammonium hydrogen phosphate, potassium sulfate, crop waste residues, a fermentation accelerant and animal waste. The fertilizer comprises the following components in parts by weight: 2-5 parts of nutrient elements; 1-3 parts of plant hormones; and 10-15 parts of ammonium bicarbonate. The organic fertilizer and the inorganic fertilizer are combined, the product is green and environment-friendly, the utilization rate of the fertilizer is increased, the fertilizer efficiency is more remarkable, the effects of further activating soil nutrients and fertilizing soil can be achieved, root growth and cell division can be promoted, crop disease resistance can be improved, conversion and absorption of nutrient elements such as nitrogen, phosphorus and potassium in the fertilizer can be accelerated, and the fertilizer efficiency is improved. And moreover, the negative influence of the fertilizer on the environment can be effectively reduced after long-term use of the fertilizer, so that the fertilizer has good social and economic benefits.

The invention discloses an organic compound fertilizer for promoting rice growth and application thereof, and belongs to the technical field of compound fertilizers. The organic compound fertilizer for promoting rice growth, provided by the invention, not only contains organic matters, but also contains inorganic nutrients and functional microorganisms, is rich in organic matters and various inorganic nutrients, can provide comprehensive nutrients for rice growth, and promotes healthy growth of rice. Urea, diammonium phosphate, potassium sulfate, calcium superphosphate and other inorganic fertilizers can provide nitrogen, phosphorus and potassium elements needed by rice growth and can be rapidly absorbed and utilized by rice; the animal waste, the rice straw enzymatic hydrolysate, the distillers' grains, the oil meal and the like can provide sufficient nutrients for rice and promote growth of the rice on one hand, can improve physical properties of soil and promote growth and development of rice root systems on the other hand, and are combined with the microelements, the compound microbial powder and the silicon fertilizer in use, and the components act together, so that the effect of improving the rice yield is achieved. The growth of the rice is promoted, the yield of the rice is increased, and the physical property of the soil is improved.

This invention belongs to the field of new materials in novel tobacco products, specifically disclosing a method for improving the sensory evaluation quality of novel tobacco sheets produced using the slurry method. The method involves obtaining a slurry containing a binder and tobacco ash, adding additives to the slurry and adjusting the pH to 3-6, followed by stirring and reacting at a temperature of 50-95°C and low pressure to obtain a modified slurry. The modified slurry is then spread and dried to obtain novel tobacco sheets produced using the slurry method. The additives include additive A, additive B, and additive C. Additive A is at least one of ammonium dihydrogen phosphate, ammonium phosphate, and diammonium hydrogen phosphate; additive B is a compound having Formula 1; and additive C is a monosaccharide. The process described in this invention can selectively increase the release content of target aroma substances, thereby improving the smoking experience of the resulting novel tobacco sheets.

A method of recovery of ammonium phosphate comprises providing a start material (100) comprising struvite into a first aqueous process liquid (101) comprising monoammonium phosphate. The first aqueous process liquid (101) is mixed. Thereby the start material (100) comprising struvite is converted into monoammonium phosphate and / or diammonium phosphate in solution and a residue (103) comprising newberyite as a precipitate. The residue (103) is separated from the first aqueous process liquid (101), thereby giving a second aqueous process liquid (104) comprising monoammonium phosphate and / or diammonium phosphate. At least a part of said second aqueous process liquid (104) or a part of an aqueous process liquid (107, 112) emanating therefrom is returned into the first aqueous process liquid. Phosphoric acid (110) is added. A method for extracting nitrogen from reject water, an arrangement (1) for recovery of monoammonium phosphate and a system for extracting nitrogen from reject water is also disclosed.

The application provides a catalytic denitration agent and a preparation method thereof, and comprises the following components: a reducing base: urea 30-60 parts, ammonium carbamate 10-25 parts, ammonium carbonate 5-15 parts, ammonium bicarbonate 5-15 parts; a phase change catalytic component: ammonium dihydrogen phosphate 2-6 parts, di-ammonium hydrogen phosphate 1-5 parts, molybdate 0.05-0.5 parts, tungstate 0.1-0.8 parts, organic acid metal salt 0.1-0.8 parts, modified zeolite 1-8 parts; a functional additive: dispersant 0.2-1.0 parts, surfactant 0.1-0.6 parts, corrosion inhibitor 0.05-0.2 parts. The application constructs a multi-component complex catalytic system, and the prepared high-molecular catalytic denitration agent can realize the unity of wide-temperature high-efficiency denitration, low corrosion, low ammonia escape and high operation stability while significantly reducing the phase change temperature and energy consumption, and effectively solves the multiple problems of harsh reaction conditions, unstable efficiency and equipment corrosion in the prior art.

The present disclosure provides desensitized fertilizer compositions that are resistant to detonation. The desensitized fertilizer compositions of the present disclosure are formed, under heat, from a reaction product of a base fertilizer material, such as ammonium nitrate, and a phosphate-based additive, such as ammonium polyphosphate. The resulting compositions include monoammonium phosphate (MAP), diammonium phosphate (DAP), and polyphosphate crystals distributed throughout the crystalline fertilizer material. The presence of the distributed MAP and DAP crystals is believed to stabilize the base fertilizer material and reduce or eliminate the detonation potential of the fertilizer material.

The application provides a quick-dissolving mixed fertilizer for improving soil and a preparation method thereof, and relates to the technical field of fertilizers.The quick-dissolving mixed fertilizer for improving soil comprises the following raw materials in parts by weight: urea 20-25 parts, diammonium phosphate 10-16 parts, potassium sulfate 12-14 parts, magnesium sulfate 3-4 parts, potassium humate 5-6 parts, lignin 4-5 parts, zinc oxide 0.1-0.3 parts, manganese sulfate 0.5-0.6 parts, ammonium molybdate 0.5-1 part, coating material 6-10 parts and water 10-12 parts.The quick-dissolving mixed fertilizer for improving soil has the advantages of balanced nutrition, good quick-dissolving property, high nutrient utilization rate and remarkable soil improvement effect.The popularization and application of the mixed fertilizer will help to improve the fertility level of farmland and promote the sustainable development of agriculture.

The present invention provides a preparation method and application of a sulfur-containing molybdenum phosphide catalyst for the hydrogenation of medium- and low-temperature coal tar. The method uses ammonium heptamolybdate as a molybdenum source, diammonium hydrogen phosphate as a phosphorus source, and silicon-surface-modified alumina as a carrier. After equal volume impregnation and drying and calcination, the catalyst is first sulfurized and then hydrogenated in a fixed-bed reactor to reduce the severity of the activation process of the molybdenum phosphide and simultaneously form a sulfur-doped molybdenum phosphide active structure to obtain a sulfur-containing molybdenum phosphide catalyst. Medium- and low-temperature coal tar is then directly introduced into the original fixed-bed reactor to carry out a medium- and low-temperature coal tar full-fraction hydrogenation refining reaction. The preparation of the sulfur-containing molybdenum phosphide catalyst and the in-situ activation in the reactor of the present invention can be completed completely within the preparation and reaction system of the existing transition metal sulfide catalyst, greatly reducing the difficulty of preparing and using the phosphating catalyst. Moreover, the sulfur-containing molybdenum phosphide catalyst prepared by the present invention can be used completely based on the existing hydrogenation system and exhibits good hydrogenation activity.

The invention relates to the technical field of fertilizers, in particular to a slow-release nitrogen-phosphorus-potassium compound fertilizer and a preparation method thereof.The preparation method comprises the steps that 1, nitrogen-phosphorus-potassium basic fertilizer particles are prepared from 35-55 parts of urea, 12-28 parts of diammonium phosphate, 28-43 parts of potassium chloride and 2-5 parts of humic acid through melting, preheating, co-melting, pelleting, cooling and screening; 2, spraying and coating with polylactic acid which accounts for 0.6-1.2% of the mass of the nitrogen-phosphorus-potassium basic fertilizer particles; 3, modified bentonite (1-3% of a silane coupling agent and 97-99% of bentonite) accounting for 1.5%-2.5% of the mass of the fertilizer is used for secondary coating, inspection and packaging are carried out, and a product is obtained.According to the slow-release nitrogen-phosphorus-potassium compound fertilizer and the preparation method thereof, the product contains a basic fertilizer core and double coating layers, the particle size is 2-4 mm, the compressive strength is larger than or equal to 25 N / particle, the fertilizer is suitable for crops such as soybeans and cotton, the utilization rate of the fertilizer can be increased by 12%-20%, and the application range is wide. The crop yield is 6-33%, the slow release effect is good, the utilization rate is high, and the yield is obviously increased.

This invention relates to a method for the graded utilization of wet-process phosphoric acid and the co-production of food-grade phosphoric acid and ammonium phosphate, belonging to the field of phosphoric acid chemical technology. The method first purifies the raw phosphoric acid, with the main process involving multi-stage extraction and back-extraction to obtain food-grade phosphoric acid. For the byproduct raffinate acid, no complex purification is required; instead, a slurry process is used directly to prepare fertilizer. When producing diammonium phosphate, the final neutralization pH is controlled at 8.0-8.5, and the degree of ammoniation is 1.8-2.0. When producing monoammonium phosphate, the raffinate acid is mixed with slag acid and filter solids, and a small amount of raw material acid is added to neutralize to a pH of 4.0-4.5, with a degree of ammoniation of 1.0-1.1. This invention overcomes the problems of high slurry viscosity, equipment blockage, and low product grade caused by the direct fertilizer production of raffinate acid with a simplified process. Furthermore, it coordinates with the disposal of system waste in monoammonium phosphate production, truly achieving high-value utilization and clean production of all components of wet-process phosphoric acid.