145 results about "Monobasic ammonium phosphate" patented technology

The invention discloses an element liquid fertilizer for promoting nutrient absorption and a preparation method thereof, and belongs to the technical field of fertilizers. Comprising monoammonium phosphate; urea; potassium nitrate; cake fertilizer leach liquor; trace elements; a wetting agent; a stabilizer; a biological agent; an adsorbent; deionized water; the preparation method of the adsorbent comprises the following steps: A1, taking loofah sponge powder, and removing lignin and hemicellulose to obtain loofah sponge cellulose powder; a2, mixing the loofah sponge cellulose powder, deionized water, a chitosan solution and plant ash, mechanically pulping uniformly, performing vacuum freeze-drying treatment to form holes, crushing and grinding to obtain the adsorbent, root development can be promoted, elongation and thickening of stems are promoted, the photosynthetic rate of plants is increased, and the crop yield is increased.

A granular cohered MOP fertilizer having one or more micronutrients, and one or more binding ingredients. The fertilizer is prepared by compacting MOP feed material with a source of zinc and one or more optional binders to form a cohered MOP composition. The cohered MOP composition is then further processed, such as by crushing and sizing, to form a cohered granular MOP product containing a source of zinc. The process yields a fertilizer product containing micronutrients with superior elemental and granule size distribution without compromising handling or storage qualities.

The invention discloses a special slow-release compound fertilizer for corn and a preparation method thereof, the special slow-release compound fertilizer comprises the following raw materials by weight: 30-40 parts of urea, 15-20 parts of ammonium sulfate, 20-25 parts of potassium sulfate, 15-25 parts of monoammonium phosphate, 2-3 parts of a seaweed extract, 0.5-1.5 parts of polyaspartic acid, 0.5-1.5 parts of trace elements, and 0.5-1 part of a slow-release agent, the slow-release agent comprises DMPP, the trace elements comprise zinc-boron-titanium citrate, and the slow-release agent comprises potassium sulfate, potassium sulfate, potassium sulfate, monoammonium phosphate, polyaspartic acid, zinc-boron-titanium citrate. The seaweed extract comprises chitosan. DMMP is added into the formula, so that stable supply of nitrogen and synergistic yield increase benefits are achieved; the chitosan, the titanium zinc borate citrate and the polyaspartic acid are added, so that the absorption efficiency of the root system is further improved, the robust growth of corn plants is promoted together, and the acre yield and the grain quality of the corn are effectively improved.

The invention relates to the technical field of fertilizers, in particular to a seaweed-containing synergistic monoammonium phosphate fertilizer as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a seaweed extract with beta-cyclodextrin, performing microencapsulation, and performing spray drying to obtain an embedded material; mixing with monoammonium phosphate and polyglutamic acid, and granulating; spraying salt-resistant compound bacteria liquid on the surfaces of the particles; and finally, coating the particles with a chitosan-sodium alginate composite film. According to the prepared synergistic monoammonium phosphate fertilizer finished product, the phosphorus utilization rate of monoammonium phosphate saline-alkali soil can be increased, the phosphorus fixation rate can be greatly reduced, the retention rate of active ingredients of the seaweed extract is greatly increased compared with that in the prior art, the rhizosphere survival rate of salt-tolerant flora is greatly increased, and the salt-tolerant flora, the seaweed extract and monoammonium phosphate cooperate to promote crop yield increase.

The invention provides an amino acid compound fertilizer for improving nitrogen and phosphorus utilization rate and a preparation method. The compound fertilizer is based on urea, ammonium sulfate, monoammonium phosphate and potassium chloride according to a specific proportion, glutamic acid / glycine compound amino acid and iron, zinc and boron trace elements are added, and the 18-12-18 proportioning fertilizer with a slow release function is formed through the synergistic effect of amino acid chelation pretreatment and a high tower granulation process. Amino acid competitive inhibition phosphorus immobilization and activation of crop nitrogen metabolic pathways are utilized, a porous coating structure is constructed by means of a modified starch binder, the technical effects that the nitrogen utilization rate is increased by 4% or above and the phosphorus utilization rate is increased by 6% or above are achieved, and the bottleneck of nutrient waste of traditional balanced fertilizers is broken through.

The invention relates to the technical field of evaporative crystallization control, in particular to an iron phosphate wastewater low-energy-consumption evaporative crystallization control system which comprises a preheating module, an evaporation concentration module, a steam circulation module, a steam detection module, a salt separation and recovery module and a low-energy-consumption control module. The evaporation and concentration module realizes water gradient evaporation and feed liquid concentration through evaporation units which are connected in series in multiple stages; the steam circulation module integrates a steam compressor and a steam ejector, leading equipment can be intelligently switched according to system requirements, and dual-mode operation of mechanical compression and thermal compression is achieved. The steam detection module judges the equipment state in real time by analyzing the rotating shadow and vibration waveform of the compressor and the audio waveform of the ejector; the salt separation and recovery module is used for continuously separating ammonium sulfate and monoammonium phosphate, recovering crystals and recovering condensed water for preheating; the low-energy-consumption control module dynamically adjusts the operation mode and steam parameters, and energy-saving optimization and stable control of the whole process are achieved.

The invention relates to the technical field of compound fertilizers, and discloses a root-promoting stress-resistant corn special fertilizer and a preparation method thereof, the root-promoting stress-resistant corn special fertilizer comprises an organic compound matrix, 8-15 parts of sodium alginate, 3-10 parts of bacillus subtilis, 3-7 parts of chelated zinc, 8-15 parts of potassium fulvate, 5-10 parts of polyaspartic acid, 17-25 parts of potassium nitrate, 12-20 parts of ammonium sulfate, 10-20 parts of bentonite and 25-35 parts of monoammonium phosphate, through the synergistic effect of various components in the fertilizer, efficient promotion of corn growth is realized, nitrogen provided by monoammonium phosphate promotes corn leaf growth and enhances photosynthesis, and phosphorus mainly promotes root development, so that the root is more developed, and the absorption capacity of the root to moisture and nutrients is improved; meanwhile, the resistance of the corn to adverse situations such as drought and cold is enhanced.

The invention relates to the field of fertilizers, in particular to a stable fertilizer for nitrogen fixation and emission reduction of a rice field and a preparation method of the stable fertilizer. The fertilizer core comprises the following components: 28-32 parts of ammonium sulfate, 4-6 parts of monoammonium phosphate, 8-12 parts of potassium sulfate, 0.15-0.50 part of a composite nitrification inhibitor, 1-3.5 parts of zinc sulfate monohydrate and 1-2 parts of borax; wherein the composite nitrification inhibitor is obtained by mixing 3, 4-dimethyl-pyrazole phosphate and a phenylboronic acid-phosphoryl compound in a mass ratio of (2-7): 1. The fertilizer product has a scientific and reasonable formula, the long-acting nutrient content and the trace element substance composition are reasonable, the controlled release function is achieved, nutrients needed by rice growth can be met, the fertilizer utilization rate is increased, and the yield and the quality are improved.

The invention discloses a water-soluble fertilizer containing humic acid. The water-soluble fertilizer comprises the following components in parts by weight: 5-8 parts of ammonium sulfate, 28-32 parts of calcium ammonium nitrate, 18-22 parts of monoammonium phosphate, 32-38 parts of potassium sulfate and 10-15 parts of modified potassium humate. The preparation method comprises the following steps: carrying out alkali extraction on modified humic acid obtained by modifying lignite to prepare modified potassium humate, adding the modified potassium humate into a fertilizer raw material, and granulating to prepare the humic acid-containing water-soluble fertilizer. The preparation process comprises the following steps: S1, crushing and sieving the ammonium sulfate, the calcium ammonium nitrate, the monoammonium phosphate and the potassium sulfate, adding the modified potassium humate into a granulator in proportion, and uniformly stirring to obtain a mixture; s2, urea and water are prepared into a solution according to the mass ratio of 1: 3; and S3, uniformly spraying the urea guniting solution prepared in S2 into the raw material layer, and stirring until liquid drops and powder are in full contact to form particles to prepare the fertilizer. The humic acid-containing water-soluble fertilizer produced by the invention has the advantages of high nutrient content, soil structure improvement, crop root growth promotion and yield increase.

The invention provides a fertilizing method for increasing the rice yield based on straw mixed fertilizer, and belongs to the technical field of fertilizer. The fertilizing method comprises the following steps: applying a rice straw mixed fertilizer as a base fertilizer once, wherein 170-250 kg of the rice straw mixed fertilizer is applied per mu; applying tillering fertilizer once after the rice turns green, and applying ear fertilizer once from the end of tillering to the early stage of jointing and booting; the rice straw mixed fertilizer comprises the following components in parts by weight: 80-90 parts of straw, 1-3 parts of monoammonium phosphate, 5-10 parts of urea and 2-4 parts of potassium chloride. The fertilizing method can effectively improve the soil fertility, increase the rice yield, increase the fertilizer utilization rate and effectively reduce the application amount of the chemical fertilizer, so that the fertilizing method has better chemical fertilizer reduction and synergism effects and is worthy of production, popularization and application. According to the fertilizing method, through a one-base two-topdressing mode, on the basis of reducing chemical fertilizer application, the rice yield is remarkably increased, the number of times of panicle fertilizer application is reduced by 1-2 times compared with that of a conventional fertilizing mode, and the fertilizing method has more advantages compared with a traditional fertilizer applying method.

The invention discloses an anti-leaching nutrient slow-release synergistic compound fertilizer, and particularly discloses an anti-leaching nutrient slow-release synergistic compound fertilizer and a preparation method thereof. The compound fertilizer comprises the following components in parts by weight: 30-50 parts of urea particles, 15-25 parts of monoammonium phosphate, 20-30 parts of potassium sulfate, 2-5 parts of a slow-release synergistic coating agent, 1-3 parts of a bonding wrapping layer and 10-20 parts of a filling material. The slow-release synergistic coating agent comprises polyaspartic acid (PASP) and a composite inhibitor (a urease inhibitor and a nitrification inhibitor), and the bonding wrapping layer is made of a polyvinyl alcohol / sodium polyethylene acid-based cementing material. The preparation method comprises the following steps: mixing and granulating raw materials, carrying out primary coating (slow-release synergist), carrying out secondary coating (bonding a coating layer), and drying and screening. Through the synergistic effect of the double coating technology and the compound inhibitor, the nitrogen conversion and release are obviously delayed, the nutrient leaching loss is reduced by 20-40%, the fertilizer utilization rate is improved by 25-30%, and the compound fertilizer is suitable for high-temperature and rainy areas.

The invention relates to a synergistic biological prevention and control double-effect regulation compound fertilizer applicable to corn and a preparation method, and the synergistic biological prevention and control double-effect regulation compound fertilizer applicable to corn is prepared from the following raw materials in parts by mass: 15-20 parts of urea, 10-15 parts of controlled-release nitrogen fertilizer, 8-12 parts of monoammonium phosphate, 5-8 parts of calcium magnesium phosphate fertilizer, 10-15 parts of potassium sulfate, 1-2 parts of zinc sulfate, 0.5-1 part of boric acid and 0.2-0.5 part of ammonium molybdate. According to the invention, through the synergistic effect of the microbial agent and the Chinese herbal medicine extract, the effect of biological prevention and control is achieved, the use of chemical pesticides is reduced, and the risk of pesticide residues in corn is reduced.

The utility model relates to the technical field of phosphorite treatment, in particular to a device and system for preparing ammonium phosphate and byproduct nitrophosphate fertilizer by decomposing phosphorite with nitric acid. The device comprises an acidolysis tank, the acidolysis tank is connected to a first separator, the first separator is connected to a first crystallizer, the first crystallizer is connected to a second separator, the second separator is connected to a decalcification tank, the decalcification tank is connected to a denitration tank, and the denitration tank is connected to a second crystallizer. The denitration tank is respectively connected to the repulping tank and the purification equipment; the re-pulping tank is connected to a neutralizing tank, and the neutralizing tank is connected to a first concentrator; and the purification equipment is connected to the second concentrator. According to the device disclosed by the invention, the mother liquor generated by the acidolysis tank is deeply processed to prepare monoammonium phosphate and purified phosphoric acid, meanwhile, a byproduct white fertilizer can be processed into a phosphorus (potassium) nitrate fertilizer, and a byproduct white gypsum is obtained.

The application relates to the technical field of chemical preparation, and particularly relates to a liquid monoammonium phosphate and iron phosphate production system. The system comprises a mother liquor treatment device, a pH adjusting tank, a purified phosphoric acid storage tank, a liquid monoammonium phosphate storage tank and an iron phosphate production device; the output end of the mother liquor treatment device is connected with the first input end of the pH adjusting tank, the output end of the purified phosphoric acid storage tank is connected with the second input end of the pH adjusting tank, and the purified phosphoric acid and the mother liquor to be adjusted are injected into the pH adjusting tank; the mixed reaction area of the pH adjusting tank is configured to neutralize the mother liquor to be adjusted and the purified phosphoric acid according to a preset ratio to generate liquid monoammonium phosphate; the input end of the liquid monoammonium phosphate storage tank is connected with the output end of the pH adjusting tank, the output end of the liquid monoammonium phosphate storage tank is connected with the raw material inlet of the iron phosphate production device, and the iron phosphate production device is configured to synthesize iron phosphate by taking the liquid monoammonium phosphate as a raw material. The application has the beneficial effects of simplifying a production process and reducing energy consumption.

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 invention discloses a method for producing 55% powdery monoammonium phosphate by using filter-press white fertilizer and phosphoric acid sludge acid, and belongs to the technical field of production of powdery monoammonium phosphate. According to the method for producing novel 55% powdery monoammonium phosphate in a tubular reactor by using waste white fertilizer and phosphoric acid sludge acid which cannot be treated in the filter-press production process, the production process flow is greatly shortened, the production cost is reduced, and the production efficiency is improved. The number of process pipelines and production equipment is reduced, the length of the process pipelines is shortened, the energy consumption and the equipment maintenance cost are greatly reduced, and the effects of saving energy, reducing consumption and improving quality and efficiency are achieved; meanwhile, the waste white fertilizer which cannot be treated in the filter pressing production process and the waste phosphoric acid slag slurry generated in phosphoric acid production are treated, and the production cost is reduced.

A liquid separation method (10) for separating mono ammonium phosphate ("MAP") (20) in aqueous solution, includes: • a receiving step in which a process liquid which comprises water and MAP is received; • a cooling step in which a controlled cooling process is applied to the process liquid to induce the crystallization (14) of MAP; • a separating step (16) in which the crystallised MAP is separated from the remaining process liquid.

The present invention discloses a method for producing lithium iron phosphate by recycling water resources, which belongs to the field of new energy material technology, including: using filtered wash water to dissolve ferrous sulfate and monoammonium phosphate, which undergo synthesis and aging reactions to obtain an iron phosphate reaction liquid, which undergoes solid-liquid separation, washing, etc. to obtain dihydrated iron phosphate; the dihydrated iron phosphate reacts with a lithium source and a carbon source, and is then dried and calcined to obtain lithium iron phosphate. During the entire process, the production wastewater is recycled after simple treatment, achieving zero discharge of wastewater and effective recovery of lithium ions, greatly reducing production costs. According to statistics, the present invention actually saves 0.15-0.58 kg of lithium and 24.3-29.3 m3 of pure water per ton of lithium iron phosphate. 3 , reduce the amount of washing water and iron-lithium wastewater treatment to 28.6~29.8m 3 and 1.6~2.2m 3 .

The utility model discloses an ammonium sulfate and monoammonium phosphate mixed solution evaporative crystallization salt separation treatment system which comprises a preheating unit, an ammonium sulfate evaporation concentration unit, an ammonium sulfate evaporation crystallization unit, a recovery heat exchange unit, an ammonium sulfate post-treatment unit, a monoammonium phosphate cooling crystallization unit, a monoammonium phosphate post-treatment unit and a carnallite treatment unit. According to the technical scheme adopted by the utility model, a mixed solution containing ammonium sulfate and monoammonium phosphate is subjected to combined treatment, so that qualified ammonium sulfate crystal salt, monoammonium phosphate crystal salt and mixed salt can be obtained, and the by-product benefit of a wastewater treatment system can be effectively improved.

The invention provides a preparation method of nano iron phosphate, and belongs to the technical field of battery positive electrode materials. The preparation method of the nano iron phosphate comprises the following steps: mixing N-dodecanoyl-L-sodium alanine with ferrous sulfate, adding monoammonium phosphate and hydrogen peroxide, and carrying out oxidation and precipitation reaction to obtain a basic iron phosphate yellow material; carrying out gradient aging on the basic iron phosphate yellow material to obtain an iron phosphate dihydrate white material; and drying and calcining to obtain the nano iron phosphate. According to the method, N-dodecanoyl-L-sodium alanine is added into the ferrous sulfate solution in the reaction stage to induce formation of a staggered nano-particle primary structure, and agglomeration of iron phosphate particles in the reaction stage is inhibited, so that compact and ordered gaps can be formed in the prepared nano iron phosphate. The nano iron phosphate obtained by the method is used as a raw material to synthesize lithium iron phosphate, so that the lithium iron phosphate with high compaction density and excellent electrical properties can be obtained at a relatively low calcination temperature, and the method can be applied to preparation of electrodes.

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.

The application belongs to the technical field of fertilizers, and particularly relates to a yeast-source biological organic fertilizer suitable for aquaculture and a preparation method and application thereof. The yeast-source biological organic fertilizer suitable for aquaculture comprises the following components in parts by weight: 40-80 parts of yeast metabolites, 15-30 parts of ammonium chloride, 10-20 parts of monoammonium phosphate and 3-8 parts of a compound microbial agent. The yeast-source biological organic fertilizer suitable for aquaculture has reasonable proportioning, a high number of beneficial bacteria, a good symbiotic environment of multiple bacteria and strong biological activity. The organic active nutrients, effective microbial groups and inorganic nutrients are complete and scientifically proportioned, and the fertilizer has good effects of fertilization, water culture and algae cultivation, can improve the aquaculture water environment, supplement feed organisms, promote the growth of aquaculture objects, improve product benefits and is more conducive to environmental protection.

The utility model relates to the technical field of solid-liquid separation filters, and particularly discloses a solid-liquid separation filter for producing powdery monoammonium phosphate, which comprises a bottom plate, two symmetrical collecting tanks are mounted on the bottom plate, and a support frame is fixedly connected onto the bottom plate. The efficiency in the solid-liquid separation process is improved by introducing the vibration assembly and a rotating mechanism, that is, the first motor drives the cam to rotate, periodic downward pressure is applied to the disc, and the connecting rod drives the filtering tank to vibrate, so that the permeation speed of liquid in the screening holes is increased, and the filtering efficiency is improved; the rotating mechanism allows the filtering tank fully loaded with solids to be moved out of the upper part of the collecting tank, and a new empty filtering tank is replaced for continuous screening operation, so that the whole filtering process does not need to be stopped, continuous operation is ensured, liquid cannot be attached to the filtering tank in a vibrating state, residues of wet-process phosphoric acid during overturning and material cleaning of equipment are reduced, and the equipment quality is improved. And raw material waste is reduced.

The invention discloses a monoammonium phosphate reaction concentration system and method. The system comprises a first-effect evaporation device, a second-effect evaporation device and a condensing device, the first-effect evaporation device comprises a static mixer, a first-effect circulating pump, a first-effect heater and a first-effect flash tank, the first-effect heater, the static mixer and the first-effect flash tank are sequentially connected, and the bottom of the first-effect flash tank is connected with the first-effect heater through the first-effect circulating pump to achieve circulation; the second-effect evaporation device comprises a second-effect circulating pump, a second-effect heater and a second-effect flash tank, the second-effect heater is connected with the second-effect flash tank, the bottom of the second-effect flash tank is further connected with the second-effect heater through the second-effect circulating pump to achieve circulation, and an outlet of the first-effect circulating pump is further communicated with an inlet of the second-effect circulating pump through a first circulating pipeline; the second-effect heater is connected with the first-effect flash tank to utilize a first-effect gas phase from the first-effect flash tank as a heat source, and the condensing device is connected with the second-effect flash tank. The method can improve the reaction conversion rate.

The invention discloses a method for producing disodium hydrogen phosphate dodecahydrate from industrial monoammonium phosphate mother liquor, which comprises the following steps of: A, reacting the industrial monoammonium phosphate mother liquor and monocalcium phosphate in a primary reactor to obtain reaction slurry; b, the reaction slurry is subjected to filter pressing for solid-liquid separation, ammonium phosphate clear liquid is obtained, and a filter cake is used for producing powdery ammonium phosphate; c, slowly adding solid sodium hydroxide into the ammonium phosphate clear liquid to obtain disodium hydrogen phosphate slurry; and D, carrying out filter pressing on the reaction slurry to obtain a disodium hydrogen phosphate clear solution, and carrying out concentration, water replenishing crystallization, centrifugation and drying to obtain a disodium hydrogen phosphate dodecahydrate finished product and a mother solution. According to the method, the purity of the obtained disodium hydrogen phosphate dodecahydrate is 97% or above, and the defects in the prior art are overcome.

The invention discloses a lithium source impurity removal method, lithium phosphate and a preparation method thereof, and belongs to the technical field of battery materials. The invention solves the problem of how to provide a method for preparing high-purity lithium phosphate from a lithium source in lithium ore. The method comprises the step of removing impurities from a lithium source, and specifically comprises the following steps: roasting lithium ore, and leaching a product obtained after roasting to obtain a lithium sulfate solution; adding one or more of ammonia water, ammonia gas or liquid ammonia into the lithium sulfate solution to adjust the pH value to 8-11, and then filtering to obtain primary purified mother liquor; adding monoammonium phosphate or / and diammonium phosphate into the primary purified mother liquor, adjusting the pH value to 8-11 again, reacting under the stirring condition, and filtering to obtain secondary purified mother liquor; and adding EDTA (Ethylene Diamine Tetraacetic Acid) into the secondary purified mother liquor to obtain the lithium sulfate purified mother liquor. And adding one or more of ammonia water, ammonia gas or liquid ammonia into the monoammonium phosphate solution to adjust the pH value to 8-11, and adding the purified lithium sulfate mother liquor into the monoammonium phosphate solution to obtain the high-purity lithium phosphate.

The invention relates to the technical field of flash evaporation dryers, in particular to a flash evaporation dryer for monoammonium phosphate slurry filter cakes, which comprises a flash evaporation box, a crushing mechanism is arranged in the flash evaporation box, the monoammonium phosphate slurry filter cakes entering the flash evaporation box are crushed through the crushing mechanism, a conveying mechanism is arranged on one side of the flash evaporation box, and the conveying mechanism is arranged on the other side of the flash evaporation box. The monoammonium phosphate slurry filter cake is conveyed into a flash evaporation box through a material conveying mechanism; crushed and dried particles are driven by hot air flow to rise upwards, small-particle materials can penetrate through filtering holes in a connecting plate, large-particle materials are filtered in the filtering holes, a fan is driven by the hot air flow upwards to rotate, and the fan rotates to drive a blowing mechanism and a crushing mechanism to rotate synchronously. The blowing mechanism blows large particle materials filtered in the filtering holes into the grinding mechanism, the grinding mechanism grinds the large particle materials into small particle materials, the small particle materials are sent into the flash evaporation box again, and the small particle materials penetrate through the filtering holes again through rising hot air flow.

The invention is applicable to the technical field of agricultural planting, and provides a universal water-soluble fertilizer for agricultural planting and a preparation method of the universal water-soluble fertilizer. The water-soluble fertilizer comprises the following components in parts by weight: 10-20 parts of monopotassium phosphate, 8-14 parts of monoammonium phosphate, 6-12 parts of calcium nitrate, 5-12 parts of amino acid calcium, 7-16 parts of carotenoid, 3-8 parts of yeast nucleotide, 2-4 parts of glucan, 5-10 parts of a seaweed extract, 9-21 parts of fish meal, 6-14 parts of fish protein, 1.5-3.5 parts of a chelating agent, 0.5-3 parts of a penetrant, 0.4-2 parts of an auxiliary agent and 1-3 parts of trace elements. The water-soluble fertilizer product prepared by the invention not only meets macroelements required by crop growth, but also improves the comprehensive efficiency of the fertilizer by adding bioactive substances such as amino acid calcium, carotenoid, yeast nucleotide and the like; the universal water-soluble fertilizer can flexibly meet the nutritional requirements of different crops in different growth stages and different use environments, and effectively solves the problem that the existing water-soluble fertilizer is difficult to flexibly adjust.

According to the plastic multi-span greenhouse wild jujube early-maturing-promoting cultivation method, a planting layer with the thickness being 40 cm or above is adopted, the soil salt content is controlled to be smaller than 0.3%, the pH value is controlled to be 7.5-8.0, in the first year, 3000 kg / mu of organic fertilizer is applied to improve soil, and the seedling survival rate is increased. The method comprises the following steps: carrying out drip irrigation twice within 48 hours, growing seedlings with 2-4 needle leaves, fertilizing every 10 days in the growing season to the middle ten days of August, and combining a tree form regulation and control technology in the second year to solve the problem of'small old trees', so that the tree body reaches the standard of a high-quality fruiting tree form. In a flower and fruit management link, monopotassium phosphate and an amino acid foliar fertilizer are sprayed in a squaring stage, and a compound pollination agent is used when 60% of flowers bloom, so that the natural pollination rate is increased. In the aspect of water and fertilizer synergy, precise irrigation is carried out 8-12 times in the third year, fertilization is carried out according to the proportion of 25-35 kg / mu of urea, 20-30 kg / mu of monoammonium phosphate and 30-40 kg / mu of potassium sulfate, and the fertilizer utilization rate is increased. By integrating the measures, the high-quality fruit rate of the wild jujube is greatly improved.

A method for producing pure phosphate comprises providing (S10) a reextraction solution carrying a reextracted phosphate from a feed liquid comprising phosphoric acid contaminated with a heavy metal and iron, the reextraction solution being an aqueous solution of one of monoammonium phosphate and monopotassium phosphate. A base is added (S20) to the separated reextraction solution, raising the pH to 2-5.5, forming a heated solution and causing precipitation of a compound comprising iron and phosphate. And adding (S30) a precipitating agent for precipitating heavy metals. Separating (S40) the precipitated compound comprising iron and phosphate and the precipitated heavy metal compound. Thereafter, the heated filtered solution is cooled (S50) into a cooled solution, causing precipitation of the phosphate compound. The precipitated phosphate compound is removed from the cooled solution (S60). The cooled solution is recycled (S70) for use as an input back extraction solution in the back extraction operation. A system for producing pure phosphates is also disclosed.