74 results about "Ammonium magnesium phosphate" patented technology

This invention discloses a method for pretreating high-concentration ammonia-nitrogen wastewater. The method comprises: (1) introducing ammonia nitrogen wastewater into a reactor; (2) adding composite phosphates that are composed of magnesium salt and two or more of phosphates, dihydrogen phosphates, hydrogen phosphates and phosphoric acid, and reacting at pH 8.0-9.5 for 10-60 min; (3) precipitating under gravity for 10-20 min, and discharging the supernatant. Compared with present techniques, the method uses composite phosphates to remove high-concentration ammonia-nitrogen, thus having some advantages. Besides, the method does not require the adjustment of pH value separately, and the obtained ammonium magnesium phosphate can be used as a fertilizer.

The invention discloses a method for recycling magnesium from middle-low grade high-magnesium phosphate rock, which is used for pretreating phosphate rock serving as a raw material and recycling magnesium during wet phosphoric acid production. The method comprises the following steps of: removing magnesium from the middle-low grade high-magnesium phosphate rock with a magnesium removing agent by using a chemical method and dissolving most magnesium in the phosphate rock out of phosphate rock pulp; after a magnesium removing reaction is finished, performing solid-liquid separation on the formed pulp, wherein an obtained solid filter cake is magnesium-removed phosphate concentrate which can be put into the wet production of phosphoric acid; putting filtrate serving as magnesium-removed pulp into a next precipitation reaction procedure, adding an appropriate amount of neutralizing precipitant to adjust the pH value to 7.5-9.0 and undergoing a precipitation reaction; and performing solid-liquid separation after the reaction, and drying the solid precipitate which is ammonium magnesium phosphate with air stream to obtain a finished ammonium magnesium phosphate slow-release fertilizer. The obtained filtrate (containing ammonium sulfate) can be returned to wet phosphoric acid production.

The invention provides a method for preparing gypsum whiskers, magnesium chloride, ammonium magnesium phosphate and ammonium chloride from phosphate tailings. The method comprises the following steps:adding an acidizing fluid into phosphate tailings in batches, dropwise adding hydrochloric acid to react, separating silicon slag and an acidolysis solution, and cooling and crystallizing the acidolysis solution to obtain calcium chlorophosphate and acidolysis solution; adding concentrated sulfuric acid into the acidizing fluid, dropwise adding the acidolysis fluid for reaction, and performing centrifugal separation after reaction to obtain gypsum whiskers and the acidizing fluid; heating and concentrating the acidizing fluid, crystallizing to obtain a magnesium chloride solution, and centrifugally separating the magnesium chloride solution to obtain magnesium chloride hexahydrate and a magnesium chloride mother liquor; adding ammonium sulfate and calcium chlorophosphate into the magnesium chloride mother liquor for reaction, filtering to obtain gypsum and a filtrate after the reaction is finished, dropwise adding ammonia water into the filtrate, cooling and filtering to obtain ammonium magnesium phosphate and an ammonium chloride solution; heating, concentrating, and cooling the ammonium chloride solution to obtain ammonium chloride crystals and a crystallization mother liquor, and after centrifugal separation, preparing a 5 to 20% ammonia water solution from the crystallization mother liquor and ammonia water. According to the technical scheme, the recovery rate of phosphorus reaches 99%, and the recovery rate of calcium reaches 95%.

The invention discloses a multifunctional special fertilizer for nursery stocks and a preparation method thereof. The multifunctional special fertilizer for nursery stocks is prepared from the following raw materials in parts by weight: 30-40 parts of kitchen garbage, 15-25 parts of tea-seed pancake, 10-15 parts of stone coal flag, 12-18 parts of skin of bamboo shoots, 10-15 parts of coffee grounds, 16-22 parts of broken branches and fallen leaves, 10-15 parts of dry red soil, 8-16 parts of attapulgite, 5-10 parts of sea mud, 1.5-2.5 parts of strain powder, 15-20 parts of urea, 5-10 parts of ammonium magnesium phosphate, 10-15 parts of calcium superphosphate, 2-4 parts of potassium fulvic acid, 5-10 parts of sodium carboxymethyl starch, 4-8 parts of chitosan oligosaccharide, 3-6 parts of bone meal, 1-2 parts of zinc citrate, 1-2 parts of copper sulfate, 10-15 parts of opal, 12-16 parts of bryozoatum, 5-10 parts of coral sand, 2-3 parts of tobacco stems, 3-4 parts of tomato leaves, 1-2 parts of chenopodium ambrosioides, 2-3 parts of parepigynum funingense, 1.5-2.5 parts of masson pine and 1-2 parts of buxus sinica leaves. The fertilizer disclosed by the invention is high, long and comprehensive in fertilizer efficiency, the ecological environment of crops is improved, the plant diseases and insect pests of soil are restricted, the granular structure of soil is improved, the soil hardening is eliminated, the soil is loosened, the yield-increasing effect is obvious, and the crop quality is obviously improved.

The invention discloses an ammonium magnesium phosphate slow release fertilizer and a preparation method thereof, belonging to the technical field of waste water treatment. The ammonium magnesium phosphate slow release fertilizer contains at least one of potassium, iron, calcium, zinc, titanium and sulfur and a rare earth, wherein the rare earth is counted on the basis of the weight of an rare earth oxide (REO); the sum of the content of at least one of the potassium, iron, calcium, zinc, titanium and sulfur and the content of the REO is 0.01-10 percent by weight; the content of P2O5 is 15-49percent by weight; the content of N is 3-10 percent by weight; and the content of MgO is 16-26 percent by weight. In the preparation method, waste water is taken as a raw material, the ammonium magnesium phosphate slow release fertilizer is provided, so that valuable resources such as nitrogen, phosphorus, rare earth, magnesium and the like in the waste water are effectively recycled at low cost,the problem of waste water pollution is solved, and the valuable resources such as nitrogen, phosphorus, rare-earth, magnesium and the like in the waste water are effectively recycled at low cost.

The invention discloses a method for utilizing coal ash to prepare slow-release fertilizer. The coal ash is levigated and sieved, sodium hydroxide and magnesium hydrate are added into the obtained screen underflow and mixed to be uniform, the mixture is placed into a rotary kiln to be calcinated, and a calcinated material is obtained; hot water is added into the calcinated material to pulpify thecalcinated material, then the product is filtered, first filtered liquid and first filtered residue are obtained, an ammonium sulfate solution is added into the obtained first filtered residue, then aphosphoric acid solution is added to condition the pH value of the solution, diammonium hydrogen phosphate is added and stirred to react, the product is filtered, and second filtered liquid and second filtered residue are obtained; and the second filtered residue is dried, crushed, and screened, and the slow-release fertilizer is obtained. The slow-release fertilizer is obtained by taking the coal ash as the carrier and loading ammonium magnesium phosphate on the coal ash, the fertilizer efficiency release time is improved by 20% or above than simple ammonium magnesium phosphate slow-releasefertilizer, the soil property can be improved as well, the soil is loosened, the water permeating speed of the soil is increased, and the fertilizer can adsorb water, and achieves the effect of waterconservation.

The invention discloses an ammonium magnesium phosphate sustained-release fertilizer containing rare-earth complex salts and a preparation method thereof, and belongs to the technical field of fertilizer preparation. The sustained-release fertilizer contains rare-earth complex salts; the content of the rare-earth complex salts is 0.01 to 5.0 weight percent based on rare-earth oxides (REO); and the rare-earth complex salts are at least one of rare-earth complex sulfate, rare-earth complex carbonate, rare-earth complex nitrate and rare-earth complex oxalate. The preparation method comprises the following steps of: premixing waste solution containing rare-earth ions, magnesium ions and ammonium ions and waste solution containing at least one kind of ions of sulfate radical, nitrate radical, carbonate radical and oxalate radical, regulating the pH to be between 1 and 4.5, adding waste solution containing phosphate radical ions after reacting, regulating the pH to be between 8 and 11 by using an alkali substance, and performing post treatment on the sediment obtained by the reaction to obtain the ammonium magnesium phosphate sustained-release fertilizer containing rare-earth complex salts. The ammonium magnesium phosphate sustained-release fertilizer containing the rare-earth complex salts is prepared by using rare-earth industrial waste water and other industrial waste water, so that beneficial elements such as rare earth, nitrogen, phosphorus and the like are slowly released, and the utilization efficiency of the fertilizer is improved.

Production of ammonium magnesium phosphate monohydrate is carried out by putting monohydrate ammonium-magnesium phosphate 1500 kg, 90% magnesium hydrate 640 kg, and mono-ammonium phosphate 1150 kg into reactor, then adding into water 2000 kg, heating to 90 deg. C, agitating for 1 hr to generate ammonium-magnesium phosphate hexahydrate, centrifugal separating while depositing, drying by hot air at 105 deg. C for 3 hrs to obtain slow-release fertilizer 1550 kg. It has less labor strength and no environmental pollution.

The invention discloses coated fertilizer for improving acidic soil and a preparation method thereof. The preparation method comprises the following steps: (1) pre-heating fertilizer particles; (2) stirring and mixing ammonium magnesium phosphate, sodium carboxymethyl cellulose and oil to obtain coating homogenized paste; (3) uniformly spraying the coating homogenized paste on the surfaces of thefertilizer particles which are pre-heated in step (1); (4) after uniformly mixing biological charcoal powder and palygorskite powder, covering the mixture on the product obtained by step (3) to prepare the coated fertilizer. According to the coated fertilizer prepared by the preparation method, the fertilizer is coated with a special material, so that the aims of postponing a nutrient releasing speed and delaying the validity period of the fertilizer are realized. The coated fertilizer is convenient to apply; after the coated fertilizer is applied into soil, the fertilizer is gradually decomposed under the action of chemical and biological factors; nutrients are slowly released, and requirements of crops for the nutrients in a whole growth period can be met.

The invention relates to a compound fertilizer with a sterilization function, which is prepared from the following components in parts by weight: 36 to 40 parts of ammonium dihydrogen phosphate, 38 to 42 parts of wormcast, 34 to 38 parts of bagasse, 38 to 42 parts of flour weevil powder, 34 to 38 parts of ground phosphate rock, 38 to 42 parts of heteroauxin, 34 to 38 parts of medical stone powder, 40 to 44 parts of livestock and poultry manure, 34 to 38 parts of ground corncob, 38 to 42 parts of ammonium magnesium phosphate, 34 to 38 parts of amino acid powder, 38 to 42 parts of itaconic acid, 34 to 38 parts of compound sodium nitrophenolate, 38 to 42 parts of algae powder, 34 to 38 parts of probiotics, 38 to 42 parts of chitin, 34 to 38 parts of picoxystrobin, 38 to 42 parts of propamocarb, 34 to 38 parts of furfural residue, 38 to 42 parts of benfuracarb, 34 to 38 parts of sodium molybdate, 38 to 42 parts of dodecyl polyglucoside and 1000 to 2000 parts of water. The compound fertilizer has excellent nutritive elements and good antibacterial and insecticidal properties, is suitable for being used in the field of agriculture, and shortens the ripening time of plants.

The invention relates to a method using sea water or brine to produce ammonium magnesium phosphate. The method includes the steps of firstly, adding an inducer into the sea water or brine, and evenlymixing; secondly, adding a diluent into the seawater or brine, and regulate pH to allow the pH to stably be 7-9; thirdly, performing standing settling for 1-12 hours, wherein the reaction system is divided into supernate and solid sediments after the standing settling; fourthly, performing solid-liquid separation to obtain the solid sediments, namely ammonium magnesium phosphate. Compared with theprior art, the method has the advantages that ammonium magnesium phosphate low in solubility product is produced to recycle magnesium ions, and high magnesium recycling rate is achieved; due to the fact that the ammonium magnesium phosphate is more expensive than magnesium hydroxide, the method is good in economic benefits; when the magnesium ions in the sea water or brine is recycled, other divalent (or above) ions are partially and completely precipitated, the material basis for forming water scale is basically eliminated in the supernate obtained after the sediments are separated, and convenience is brought to subsequent treatment.

The invention discloses a high-latitude region stevia rebaudiana special-purpose fertilizer. The high-latitude region stevia rebaudiana special-purpose fertilizer comprises the following raw materials in parts by weight: 25-35 parts of ammonium hydrogen phosphate, 5-15 parts of ammonium sulfate, 2-12 parts of rock phosphate, 10-18 parts of a kiln dust potash fertilizer, 0.2-0.8 parts of boron magnesium fertilizer zinc, 0.4-0.9 parts of hexaurea iron(III) trinitrate, 2-6 parts of ammonium magnesium phosphate, 0.5-1.2 parts of ammonium molybdate, 1-2 parts of a boron magnesium fertilizer, 5-10 parts of fermented corn straw, 2-8 parts of earthworm manure, 2-10 parts of Chinese medicine residue, 2-8 parts of bentonite, 20-40 parts of grape seed cake, 15-35 parts of rice bran, 5-15 parts of linen fiber composite clay, 1-4 parts of carbonized corncob powder, 1-2 parts of kaolin, 1-2 parts of fly ash, 2-4 parts of meerschaum, 1-6 parts of carboxymethyl cellulose, and 1-2 parts of brewer's grain. The nutrient element ratio is reasonable, the nutrition requirement problem of stevia rebaudiana can be solved after application, fertilizer utilization rate is increased, and the environment pollution due to fertilizer loss is reduced.

The invention discloses a preparation method for ammonium-polyphosphate-doped magnesium aluminium hydrotalcite. The preparation method comprises: fully grinding magnesium sulfate and aluminium nitrate in a mortar, putting the grinded mixed powder into deionized water for dissolving, adding sodium hydroxide and an anhydrous sodium carbonate solution with stirring, keep pH at 9-12, performing magnetic stirring at room temperature for 20 min, then adding urea and deionized water, heating to 50 DEG C and stirring for 1 h, after the reaction is finished, putting the slurry into a microwave extraction instrument, controlling the power to be 500 W, crystallizing at 150 DEG C, drying, grinding into a powder, putting the crystal powder into a reaction flask, adding deionized water and APP, heating to 120 DEG C, slowly stirring, after the reaction is finished, ageing in the pot for 10 h, cooling and drying, so as to obtain ammonium-polyphosphate-doped magnesium aluminium hydrotalcite. The method is economic and practical, low in cost, simple in technology, high in efficiency and high in quality.

The invention discloses a method for recycling waste lithium iron phosphate batteries. The method comprises the following steps: (1) roasting: roasting to remove surface hydrophobic substances; (2) oxidation leaching: dissolving a Li metal element; (3) impurity removal: carrying out precipitating to remove Fe, Al and Cu elements in the filtrate; (4) lithium precipitation: precipitating and recovering a lithium compound; (5) phosphorus precipitation: precipitating the phosphorus element in the filtrate into ammonium magnesium phosphate hexahydrate; (6) growing of a carbon nano tube: introducing a gaseous carbon-containing substance to deposit and grow into the carbon nano tube; (7) pickling: removing the Fe element; (8) flotation separation: separating the carbon nanotube suspension from the graphite to obtain the carbon nanotube and the graphite. According to the method, the green and environment-friendly oxidizing agent is used, most of lithium and iron elements are selectively recycled to serve as catalysts for growing the carbon nanotubes, phosphorus is converted into slow-release fertilizer ammonium magnesium phosphate with good performance, waste graphite is recycled together, secondary pollution is avoided, and the problem that a traditional recycling process has negative economic benefits can be solved.

The invention discloses an ammonium magnesium phosphate-coated fertilizer and a preparation method thereof. The preparation method includes spraying ammonium magnesium phosphate powder on the surfacesof fertilizer granules sprayed with preheated binders evenly, drying and spraying a sealing agent on the fertilizer granules coated with the ammonium magnesium phosphate. The ammonium magnesium phosphate-coated fertilizer prepared according to the preparation method has the advantages that with paraffin as the sealing agent, the coating effect can be better and the nutrient release period of thefertilizer can be prolonged, brittleness of an ammonium magnesium phosphate coating can be reduced and impact resistance of the coated fertilizer is improved; the ammonium magnesium phosphate-coated fertilizer can be up to the standards of slow-release fertilizers, the initial nutrient release rate is not more than 15%, the accumulated nutrient release rate in 28 days is not more than 80%, and theaccumulated nutrient release rate in the nutrient release period is not less than 80%.

The invention provides a method for producing phosphate concentrate from calcareous collophanite and by-producing gypsum whiskers and magnesium ammonium phosphate, and the method comprises the following steps: separating the phosphate concentrate and calcium-rich and magnesium-rich tailings from the calcareous collophanite by flotation, and carrying out acidolysis on the calcium-rich and magnesium-rich tailings to extract available valuable elements in the tailings, thereby obtaining the gypsum whiskers and the ammonium magnesium phosphate product. The method comprises the following steps: firstly, carrying out flotation on the calcareous collophanite; comprehensively utilizing calcium, magnesium and phosphorus elements in the tailings obtained by flotation; the phosphorus taste of the collophanite is improved, the collophanite can be directly used for wet-process phosphoric acid production, meanwhile, a series of problems generated by the tailings are solved, the added value of the collophanite is increased, the negative influence on the environment is reduced, and a very good guiding effect is provided for development and utilization of the collophanite.

The invention discloses a resource treatment method capable of reducing the content of ammonia nitrogen, calcium ions and magnesium ions in manganese-containing wastewater. The method comprises the steps: adding Mn(H2PO4)2.2H2O firstly, utilizing H2PO4<-> for ionization so as to obtain HPO4<2-> and PO4<3->, and performing reactions on the obtained HPO4<2-> and PO4<3-> with NH<4+> and Mg<2+> in themanganese-containing wastewater so as to produce ammonium magnesium phosphate precipitate, wherein the concentration of MnSO4 in the manganese-containing wastewater can be increased by Mn<2+> in Mn(H2PO4)2.2H2O, so that the repelling effect on CaSO4 is increased, and the solubility of CaSO4 is reduced; then adding MnSO4 so as to promote formation of CaSO4 precipitate and make Ca<2+> to precipitate in the form of CaSO4; and finally, introducing the manganese-containing wastewater through an adsorption material so as to achieve adsorption and collection of the remaining NH<4+>. Resource recovery of manganese, ammonia nitrogen and magnesium in the manganese-containing wastewater is achieved.

The invention discloses an ammonium magnesium phosphate particle not stratified when mixed and disintegrating in water and a preparation method of the ammonium magnesium phosphate particle, and belongs to the technical field of fertilizer manufacturing. According to the technical solution, the ammonium magnesium phosphate particleis prepared from the components: 90%-98% of ammonium magnesium phosphate, 1%-3% of a disintegrating agent, 1%-2% of a dispersant, 0%-2% of an adhesive and 0%-3% of a desiccant; and the stacking density of a particle is adjusted by granulation twice to obtain the2.0mm-4.0mm nearly spherical particle with the stacking density of 0.70g/cm<3>-0.75g/cm<3>,and thus the ammonium magnesium phosphate particle not stratified when mixed and disintegrating in water is obtained. According to the preparation method, by adding an auxiliary material into the ammonium magnesium phosphate and granulating twice,after mixing,no stratification of urea with the stacking density of0.72g/cm<3>-0.73g/cm<3>in a BB fertilizer is achieved, and the problem that ammonium magnesium phosphate particle cannot disintegrate and fully mix with soil in the moist environment is solved.

The invention provides a phosphorus-containing and ammonia nitrogen wastewater treatment technology. The phosphorus-containing and ammonia nitrogen wastewater treatment technology comprises the following steps: (1) adding magnesium hydrogen phosphate into phosphorus-containing and ammonia nitrogen wastewater to remove ammonia nitrogen, so as to obtain turbid liquid of ammonium magnesium phosphate;filtering and collecting ammonium magnesium phosphate sediment and filtrate I respectively; (2) adding lime into the filtrate I to remove phosphorus, so as to obtain turbid liquid containing calciumphosphate, magnesium hydroxide and less calcium hydroxide; filtering and collecting mixture sediment and filtrate II respectively; (3) introducing carbon dioxide into the filtrate II and removing residual calcium ions to obtain turbid liquid of calcium carbonate; filtering and collecting the calcium carbonate and filtrate III respectively, wherein the filtrate III is treated water without the phosphorus and the ammonia nitrogen. The phosphorus-containing and ammonia nitrogen wastewater treatment technology provided by the invention can be used for simultaneously and efficiently removing phosphorus and ammonia nitrogen harmful substances in the wastewater and the pH (Potential of Hydrogen) of the treated wastewater is nearly neutral; the content of the phosphorus is reduced to 1mg/L or lower and the content of the ammonia nitrogen is reduced to 25mg/L or lower; a valuable component ammonium magnesium phosphate is obtained; recycling preparation of a pollutant land is realized and the treated water quality is relatively good.

The invention provides a method for eliminating ammonia inhibition in an anaerobic fermentation process of livestock and poultry excrement. According to the method, a struvite crystallization and sedimentation technology is used for detecting the concentration of NH<4+> in an ammonia inhibition system under the conditions that the pH value is 7-9, and the mass concentration ratio of volatile fatty acid to total inorganic carbon is less than 0.4; magnesium salt and phosphorus salt are added into a livestock and poultry excrement fermentation reaction system according to a molar ratio of the NH<4+> to Mg<2+> to PO4<3-> being equal to 1: 1: 1; the concentration of ammonia nitrogen is reduced to about a concentration value of the fermentation process without ammonia inhibition. The method for eliminating the ammonia inhibition in the anaerobic fermentation process of the livestock and poultry excrement is established by studying the influence factors of an ammonium magnesium phosphate reaction in the inner environment of an anaerobic fermentation tank and the self-limiting factors of the reaction. The method is simple in technology; furthermore, struvite precipitation produced in the reaction is slow release fertilizer, and not only can eliminate the ammonia nitrogen inhibition, but also can recover nutrients such as nitrogen and phosphorus, so that the operating cost is lowered.

The invention discloses a seedling culture method for Camellia oleifera. The seedling culture method for Camellia oleifera comprises the following steps: (1) picking of cutting leaves; (2) preparationof a seedling culture substrate: mixing, in parts by weight, 100 parts of sandy loam, 50-70 parts of clay, 15-20 parts of expanded perlite, 10-15 parts of earthworm soil, 10-15 parts of plant ash, 10-12 parts of magnesium ammonium phosphate, 0.1-0.2 part of biological pesticide and 30-35 parts of organic fertilizer uniformly, wherein the biological pesticide comprises the following raw materials:in parts by weight, 4-8 parts of nano titanium oxide, 1-2 parts of Bacillus thuringiensis and 2-4 parts of Berberine; (3) treatment of the cutting leaves: adding the cutting leaves to a 500-fold growth enhancer solution, and performing soaking at 15-25 DEG C for 2-3 h; (4) cuttage; (5) management after cuttage: constructing a shed for sun shading, maintaining the humidity of the seedbed substrateat 65-70%, performing dressing of urea once at the dosage of 25-30 g/m<2> every time the plant height of Camellia oleifera seedlings is increased by 3-4 cm; and (6) transplantation. The cutting-leafseedling culturing method is adopted for vegetative propagation, excellent characteristics of mother Camellia oleifera trees can be maintained, stable inheritance and a high differentiation speed areachieved, and the survival rate of the cultured seedlings is 93.5% or above.

The present invention relates to soft canned crangon affinis. The soft canned crangon affinis consists of the following ingredients in parts by weight: 30-44 parts of crangon affinis bodies, 10-17 parts of fine salt, 10-24 parts of yellow rice wine, 5-8 parts of soy sauce, 8-10 parts of fresh gingers, 5-10 parts of garlic bulbs and 2-4 parts of a color protection agent. A production technology of the soft canned crangon affinis is simple in production, can prevent blackening of the crangon affinis in the soft cans, ammonium magnesium phosphate separation by crystallization and other deterioration phenomena, enables the crangon affinis to keep ideal meat quality, shapes and consumption mouthfeel, and extends a shelf life of the cans. The soft canned crangon affinis is low in costs, and easy to carry and transport.