129 results about "Hydrogen phosphate" patented technology

The invention relates to the technical field of mine water treatment, and discloses a method for treating high-calcium-hardness mine water through induced crystallization. The method comprises the following steps: adding coal gangue and sodium phosphate or sodium hydrogen phosphate into the mine water to carry out first induced crystallization so as to remove calcium ions in the mine water; according to the method provided by the invention, the concentration of calcium ions in the mine water after calcium removal can be stabilized for a long time, and the removal rate of the mine water is improved to a certain extent. The method provided by the invention can effectively ensure that the Ca < 2 + > content of the effluent quality of the mine water reaches the standard, and can also reduce secondary environmental pollution.

The invention provides an electrolyte additive for synergistically regulating and controlling activity and stability of an all-vanadium redox flow battery and application of the electrolyte additive, the electrolyte additive is a composite additive of an organic amino acid compound and inorganic phosphate, the organic amino acid compound is one of aspartic acid, glycine and cysteine, and the inorganic phosphate is one of amino acid, glycine and cysteine. The inorganic phosphate is one or two or more of phosphate, dihydric phosphate, dihydric phosphate, polyphosphate and pyrophosphate, and cations of the inorganic phosphate are one or two or more of potassium, sodium and ammonium salt. The composite additive is used as an electrolyte additive to be added into an all-vanadium redox flow battery electrolyte, so that the vanadium electrolyte can be effectively prevented from generating precipitates at high temperature, the capacity fading in the battery operation process is avoided, and the stable operation of the battery is realized. The preparation process is simple to operate, energy-saving, environment-friendly and low in cost, and stable operation of the electrolyte in the battery can be realized.

The invention relates to a flow battery electrolyte and an application thereof. The flow battery electrolyte comprises vanadium ions, a supporting electrolyte and an additive, the additive is selected from one, two or more of ammonium sulfate, ammonium phosphate, potassium phosphate, sodium metaphosphate, diammonium hydrogen phosphate and hydrogen peroxide. According to the vanadium battery electrolyte provided by one embodiment of the invention, the specific additive is added, so that vanadium ions can be in a liquid state or a microemulsion state, separation or precipitation of the vanadium ions is prevented, and the efficiency of the battery is remarkably improved.

The invention provides sodium ferric pyrophosphate and a preparation method thereof, and the preparation method comprises the following steps: mixing waste sodium ferric pyrophosphate with carbonate and an iron source to obtain a mixture, and calcining the mixture to obtain a calcined material; washing and filtering the calcined material to obtain a first filter residue and a first filtrate; performing impurity removal, concentration and crystallization on the first filtrate to obtain sodium carbonate; the first filter residues are subjected to acid pickling and filtering treatment, and second filtrate is obtained; adding phosphate and a pH regulator into the second filtrate, and heating for reaction to obtain mixed slurry; filtering the mixed slurry to obtain second filter residues, and sequentially drying, screening and deironing the second filter residues to obtain iron hydrogen phosphate; the preparation method comprises the following steps: mixing sodium carbonate with ferric hydrogen phosphate, then adding a doping agent, an auxiliary agent and a carbon source, and grinding and calcining to obtain the ferric sodium pyrophosphate. According to the method, high-purity sodium carbonate and iron hydrogen phosphate can be recycled, then pyrophosphate ferric sodium phosphate is prepared, and the pyrophosphate ferric sodium phosphate is good in particle dispersity, high in sphericity degree and high in capacity.

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 discloses a treatment process for metal ions in phosphating wastewater, and belongs to the technical field of industrial phosphating wastewater treatment. The method comprises the following steps: homogenizing phosphating wastewater to adjust the pH value to 4-5, adding Fe3O4 (at) SiO2 (at) DTPA shell-core microspheres and an induction coprecipitation agent into the wastewater, stirring, mixing and reacting, transferring the mixture into a magnetic separator for solid-liquid separation, filtering the filtrate through non-magnetic sand, and discharging the effluent; the dosage of the Fe3O4 (at) SiO2 (at) DTPA shell-core microspheres is 0.9 to 1.5 g / L; the induced coprecipitation agent is composed of magnesium hydrogen phosphate and aluminum chloride, the dosage of the magnesium hydrogen phosphate is 0.5-0.6 g / L, and the dosage of the aluminum chloride is 0.03-0.05 g / L. In the phosphating wastewater treatment process, only one-time acid adjustment is needed, chelation-coprecipitation is coupled in one reactor, only magnetic separation is needed, two-time acid adjustment is not needed, the process structure is simple, the whole-process retention time is short, and the process is effectively simplified.

The invention provides a method for preparing aza-2, 5-cyclohexadienone, and relates to the technical field of organic synthesis. Substituted phenol, an azo compound, inorganic salt and water are mixed, an intermolecular coupling reaction is carried out, aza-2, 5-cyclohexadienone is obtained, and the inorganic salt comprises one or more of carbonate, bicarbonate, phosphate, dihydric phosphate, dihydric phosphate, chlorine salt, sulfate, sulfite and silicate of alkali metal elements. According to the present invention, the cheap and easily available inorganic salt is adopted as the catalyst to catalyze the substituted phenol and azo compound molecule coupling reaction to prepare the aza-2, 5-cyclohexadienone, and the water is adopted as the reaction solvent, such that the preparation conditions are mild, the production cost is low, the produced by-products are less, the product yield is high, the atom economy is high, and the separation and the purification are simple. The method provided by the invention is simple and convenient to operate, has no pollution, meets the requirements of green chemical development and is suitable for industrial production.

The invention discloses a method for preparing feed-grade calcium hydrophosphate from raffinate acid, which comprises the following steps of: mixing alkali liquor D and raffinate acid, reacting, filtering after the reaction to obtain filtrate A and a filter cake E, and using the filter cake E for producing compound fertilizer, ammonium phosphate, superphosphate or rich calcium, and reacting the filtrate A with the calcium slurry, filtering after the reaction is finished to obtain a filtrate B and a filter cake C, returning the filtrate B to prepare an alkali liquor D, and finally drying and packaging the filter cake C to obtain the feed-grade calcium hydrogen phosphate. The method is simple in process, the value of the raffinate acid is increased, and the method is very convenient for actual production.

The application discloses a manganese iron hydrogen phosphate material and a preparation method and application thereof, relates to the technical field of battery materials. The chemical formula of the manganese iron hydrogen phosphate material is as follows: Fe x Mn (1‑x) HPO4, wherein x is 0.1-0.7.The manganese iron hydrogen phosphate material is used in a lithium battery, and the platform voltage of the manganese iron hydrogen phosphate material reaches 4.1v, the cycle life is greatly improved in comparison with a lithium iron phosphate battery, in addition, the manganese material is rich in domestic reserves, is easy to obtain, is low in price, and is small in environmental hazards, and the manganese iron hydrogen phosphate material can make up for the shortcomings of ternary and lithium iron phosphate.

The invention relates to the technical field of composite material preparation, in particular to a liquid silica gel composite material filled with hydroxyapatite nanowires and a preparation method of the liquid silica gel composite material. Calcium ions and hydrogen phosphate ions are added into a mixed solution of ethanol and oleic acid, and the one-dimensional hydroxyapatite nanowire with a hydrophobic surface is hydrothermally synthesized in an alkaline environment through a one-step method. Wherein oleic acid is used as a surface modifier to endow the material with a hydrophobic property, and nucleation and growth of hydroxyapatite nanowire crystals are adjusted by simply regulating and controlling the volume ratio of ethanol to water, so that the size of the hydroxyapatite nanowire is highly controllable from 8 microns to 50 microns. According to the invention, the biocompatibility and implantation stability of the liquid silica gel are improved. Besides, based on the enhancement effect of nanowires with different sizes on the mechanical property of the composite material, the adaptation range and the application field of the composite material are expected to be expanded, so that the requirement of the current medical material for precise and personalized development is met.

The invention discloses a method for activating manganese dioxide by using oxygen-containing anions, which comprises the following steps: placing delta-MnO2 in simulated distribution water, adding NH4 < + > to enable the concentration of the delta-MnO2 to be 2 mg / L, oscillating and incubating in a shaking table for more than 20 days, and changing the water once every 1-2 days to obtain manganese oxide with NH4 < + > oxidation capacity, the simulated distribution water contains oxygen anions with the following concentrations: 2 mM of HCO3 <->; and 0.002 mM of HPO4 < 2->. According to the method disclosed by the invention, the structure of delta-MnO2 is optimized by controlling the ratio of bicarbonate ions to hydrogen phosphate ions in water, so that the oxidation capacity of delta-MnO2 is remarkably improved, and NH4 < + > in water can be removed within a few hours instead of the original capacity without catalytic oxidation of NH4 < + >. The invention provides a feasible and economical solution for large-scale preparation of MnO2-based filter materials and water deamination engineering, and has a wide engineering application prospect.

The invention discloses a corrosion inhibitor under an oxygen-carbon dioxide coexistence resistant condition as well as a preparation method and application thereof, and belongs to the field of corrosion prevention of oil and gas fields. The corrosion inhibitor at least comprises 20-40 parts of a corrosion inhibitor main agent, 3-7 parts of a synergist, 0.8-1.2 parts of a surfactant, 45-55 parts of a solvent, 10-18 parts of amino acid and 4-8 parts of a deoxidant. The corrosion inhibitor main agent is prepared from 15 to 25 parts of dihexyl hydrogen phosphate and 5 to 15 parts of oleic acid imidazoline; the synergist is prepared from 3 to 7 parts of organic alkynol; the corrosion inhibitor under the oxygen-carbon dioxide coexistence resisting condition has efficient corrosion inhibition performance in the oxygen and carbon dioxide coexistence environment.

The application discloses a method for detecting 5-hydroxymethylfurfural in a compatibility experiment of hydrocortisone sodium succinate for injection and glucose injection by HPLC. The 5-hydroxymethylfurfural is a degradation impurity of glucose. The detection method comprises the following steps: (1) preparation of a control sample solution; (2) preparation of a test sample solution; (3) chromatographic conditions; a mobile phase A is 8mmol / L potassium dihydrogen phosphate solution (pH value is adjusted to 5.0-5.1 by using 8mmol / L potassium hydrogen phosphate solution, and the solution is prepared freshly before use); a mobile phase B is methanol, gradient elution is carried out; a detection wavelength is 284nm; a column temperature is 40 DEG C; a flow rate is 1.4-1.6mL / min; and a chromatographic column is C 18 ; the application can effectively detect the content of 5-hydroxymethylfurfural, and has strong specificity and high sensitivity.

The invention discloses a hydroxyapatite modified zinc-based composite material as well as a preparation method and application thereof. A preparation method of a hydroxyapatite-modified zinc-based composite material comprises the following steps: (1) sequentially dissolving diammonium hydrogen phosphate and calcium chloride in deionized water, adding zinc salt with the Zn < 2 + > substitution amount being 2-8% of the total molar weight of hydroxyapatite, then adjusting the pH value to 10.5-11.5, dropwise adding a phosphate solution into the mixed solution until precipitate is generated, and washing and drying to obtain Zn-HA powder; (2) zinc powder and the Zn-HA powder are mixed, aluminum oxide nanoparticles are added, and ball milling is carried out; and (3) pressing the ball-milled powder, sintering in an inert atmosphere at the sintering temperature of 400-600 DEG C, and keeping the temperature for 1-3 hours. According to the preparation method disclosed by the invention, by regulating and controlling the substitution amount of zinc in Zn-HA and a composite process, synergistic enhancement of physical bonding and chemical bonding is realized, and the bottleneck of interface bonding is broken through.

The present application relates to the field of adsorption separation technology, and particularly relates to a selective removal agent, a preparation method and application thereof. The selective removal agent contains calcium-scan double-metal layered hydroxide and diatomite, and the mass ratio of diatomite to calcium-scan double-metal layered hydroxide is greater than or equal to 0.14. The chemical formula of the calcium-scan double-metal layered hydroxide is [Ca x Sc(OH) y ]OH, x is 2-3, and y is 6-8. The selective removal agent provided in the present application has good selectivity to heat-stable salts and hydrogen phosphate, the selectivity adsorption ratio of hydrogen phosphate to heat-stable salt anions is greater than 6000, efficient separation of heat-stable salts and hydrogen phosphate can be achieved, the stability is good, the working cycle can be prolonged, and the selective removal agent is suitable for industrial popularization.

The preparation method comprises the following steps: (1) adding a lead salt and diammonium hydrogen phosphate into deionized water, stirring at room temperature, dropwise adding ammonia water into the deionized water in the stirring process, continuously stirring to obtain a mixed solution, adding the mixed solution into a hydrothermal kettle for reaction at the hydrothermal temperature of 100-200 DEG C for 10-30 hours, and filtering to obtain a filtrate; carrying out solid-liquid separation on a white product after the reaction to obtain a solid matter, drying the solid matter at 50-60 DEG C, and then carrying out high-temperature calcination to obtain lead phosphate powder; and (2) vulcanizing the lead phosphate powder to prepare the infrared detection material based on vulcanized lead phosphate. The prepared infrared detection material based on sulfurized lead phosphate is used for an infrared detector. The synthesis method has the beneficial effects that 1, the synthesis method is simple and low in cost, the used solvent is environment-friendly and green, and the synthesis method is suitable for large-scale production; and 2, the vulcanized lead phosphate disclosed by the invention has an ultra-low band gap and has the feasibility of infrared detection.

The invention discloses a corrosion-resistant self-repairing polyurea coating material for ships and a preparation method thereof.The preparation method comprises the following steps that modified zirconium hydrogen phosphate is prepared, and the modified zirconium hydrogen phosphate comprises alkylated zirconium hydrogen phosphate; the preparation method comprises the following steps: preparing a UPy group curing agent UPy-IPDA-NH2 containing quadruple hydrogen bonds; and mixing the modified zirconium hydrogen phosphate with polyurea in proportion, and adding a curing agent IPDA and a UPy group curing agent UPy-IPDA-NH2 containing quadruple hydrogen bonds, which are mixed in proportion, to obtain the self-repairing polyurea coating material. The corrosion resistance of the coating material is improved by introducing modified zirconium hydrogen phosphate, the coating is rapidly repaired after being damaged by using a quadruple hydrogen bond repair technology, the service life of the coating is remarkably prolonged, and the reliability of the coating is remarkably improved.

The invention discloses a method for producing industrial diammonium hydrogen phosphate from crude phosphoric acid, and belongs to the technical field of production of industrial diammonium hydrogen phosphate. The method solves the problem that the industrial-grade diammonium hydrogen phosphate product cannot be directly prepared by using crude phosphoric acid and ammonia gas as main raw materials. The method comprises the following steps: S1, mixing crude phosphoric acid and ammonia gas, and neutralizing for the first time, wherein the neutralization degree of the first time is 1.50-1.60; s2, filtering the material liquid obtained after the first time of neutralization; s3, concentrating the filtered material liquid, adding ammonia gas into the concentrated material liquid, and neutralizing for the second time with the neutralization degree of 1.95-2.0; and S4, cooling and crystallizing the material liquid obtained after the secondary neutralization to obtain an industrial-grade diammonium hydrogen phosphate product. The industrial-grade diammonium hydrogen phosphate product is produced by adopting a two-step neutralization method, so that the purpose of ammoniation impurity removal is achieved, heat release of ammoniation neutralization reaction is facilitated, the use of steam is reduced, the existing process is shortened, and the cost is reduced.

A method for preparing a positive electrode material and related products are disclosed. The method includes mixing a lithium source with a phosphoric acid solution to form a first mixture; combining the first mixture with manganese hydrogen phosphate, an iron source, and optionally a source of an M element to form a second mixture; and drying and sintering the second mixture to obtain a lithium manganese iron phosphate (LMFP) positive electrode material. The M element is selected from transition metals other than manganese and iron, Group IIA metals, Group IIIA metals, Group IVA metals, and Group VIIA elements. The resulting LMFP material exhibits reduced gas and by-product generation, increased compacted density, lowered resistivity, and improved specific capacity and rate performance, making it suitable for positive electrode plates, batteries, and electric apparatuses.

The invention belongs to the technical field of mineral processing treatment, and particularly discloses porous magnesium oxide based on dolomite and a macro-quantity preparation method of the porous magnesium oxide. The method comprises the following steps: crushing dolomite ore, and carrying out solid-phase reaction on the crushed dolomite ore and ammonium dihydrogen phosphate to obtain a mixture containing MgNH4PO4 and calcium phosphate; then selectively dissolving out magnesium in the mixture by using an acetic acid solution to obtain magnesium-rich filtrate and calcium hydrophosphate filter residues; mixing the magnesium-rich filtrate with ammonium bicarbonate for reaction to obtain basic magnesium carbonate precipitate and an ammonia-containing solution; sequentially carrying out first heat treatment and second heat treatment on the basic magnesium carbonate precipitate to obtain the porous magnesium oxide. According to the method, the porous magnesium oxide is successfully prepared on a large scale by taking the dolomite with large reserves and low cost as a direct raw material; the porous magnesium oxide also has the advantages of hierarchical pore structure and large specific surface area.

The invention discloses preparation of a nano-drug with NO catalytic performance and application of the nano-drug in treatment of infectious endocarditis. The preparation method comprises the following steps: respectively dissolving molybdate and hydrophosphate in water, then stirring and mixing the two solutions, and carrying out self-assembly to form oxidized molybdenum-based Keggin type heteropolyacid, namely the nano-drug (OX) with NO catalytic performance. The nano-drug prepared by the invention has GSNO catalytic characteristics and multiple antibacterial characteristics, also has antithrombotic and vascular regulation functions, can efficiently catalyze endogenous GSNO to generate NO, and realizes efficient treatment of infectious endocarditis through the synergistic effect of double functions of oxidation antibacterial-NO regulation.

The invention belongs to the field of petrochemical engineering, and relates to a single atom and cluster coexisting Pt-Ni2P / Beta n-hexane hydroisomerization catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving nickel nitrate hexahydrate in water, dropwise adding nitric acid to adjust acidity, and adding diammonium hydrogen phosphate to obtain a Ni-P precursor solution; a Beta molecular sieve is impregnated in the Ni-P precursor solution in an equivalent volume mode, and Ni2P / Beta is prepared through air drying, drying, air calcination and hydrogen reduction; and dissolving platinum acetylacetonate in acetone to prepare a platinum precursor solution, carrying out equivalent-volume impregnation on Ni2P / Beta, carrying out air drying, drying, calcining in air, and carrying out hydrogen reduction to obtain the single atom and cluster coexisting Pt-Ni2P / Beta catalyst. The method is easy and convenient to operate and mild in condition, the hydrogen activation capacity and isomerization selectivity are remarkably improved through the synergistic effect of Ni2P and trace Pt single atoms / clusters, and efficient hydroisomerization of n-hexane is achieved while the use amount of precious metal and the preparation cost of the catalyst are reduced.

A coagulant comprising a metallic salt and an acid carrier having at least one inorganic salt, an acid, and water. The metallic salt can be ferric chloride, ferric sulfate, aluminum sulfate, polyaluminium chloride, aluminum chlorohydrate, or a combination thereof. The acid carrier may comprise a first inorganic salt and a second inorganic salt. The first inorganic salt can be ammonium sulfate, and the second inorganic salt can be ammonium bisulfate. The acid can be phosphoric acid, a hydrogen halide, nitric acid, sulfuric acid, or a combination thereof. Mixing the coagulant with raw water generates a plurality of acid pockets in the raw water, causing reactions between the blended coagulant and the dissolved organic matter.

The application discloses a kind of preparation and application of N, P doped titanium carbide nano quantum dot fluorescent probe, belong to fluorescence sensing technical field.The application uses ethylenediamine, diammonium hydrogen phosphate as nitrogen source and phosphorus source respectively to synthesize the N, P doped Ti3C2MXene quantum dot of blue light emission, and the N, P doped Ti3C2MXene quantum dot has good stability and high quantum yield.Based on the fact that tetracycline (TC) can quench the fluorescence of N, P doped Ti3C2MXene quantum dot fluorescent probe, the N, P doped Ti3C2MXene quantum dot fluorescent probe is used for tetracycline detection.The fluorescent probe has high selectivity, wide linear range and high sensitivity, providing a new method for tetracycline detection in milk.

The invention discloses a raw material stirring device for calcium hydrophosphate production and processing, and relates to the technical field of stirring devices. Comprising a sleeve and a transmission shaft, a first magnetic component and a reciprocating cylinder are sequentially mounted on the sleeve, a second magnetic component is arranged on one side of the reciprocating cylinder, and a first magnetic component and a second magnetic component are arranged on the other side of the reciprocating cylinder. A first stirring blade is rotationally arranged on the other side of the reciprocating barrel. Through vertical movement of the first stirring blades, raw materials at different depths in the tank body can be continuously stirred, a mixing dead zone and a precipitation layer are effectively eliminated, it is ensured that the materials are uniformly distributed in a three-dimensional space, and the device is suitable for a mixing system containing a surfactant. The first stirring blades and the second stirring blades act together to generate efficient turbulent flow and a reverse shear flow field, so that agglomerated particles can be quickly scattered, and the mixing efficiency and the uniformity are further improved, so that the mixing quality and the reaction efficiency are doubly improved.

The invention belongs to the technical field of chemical drug analysis and detection, and discloses a method for detecting and analyzing related substances in an IDH1 mutant inhibitor, an IDH1 mutant inhibitor sample is prepared into a test solution, high performance liquid chromatography is adopted for detection, and chromatographic conditions are as follows: octadecyl phenyl bonded silica gel is adopted as a filler of a chromatographic column; a mobile phase A is a diammonium hydrogen phosphate aqueous solution, a mobile phase B is acetonitrile, and gradient elution is carried out. According to the detection and analysis method, the related substances in the IDH1 mutant inhibitor can be detected, the specificity, the quantitation limit, the detection limit, the linear range, the repeatability, the accuracy, the durability and the like completely meet the standards, and meanwhile the detection and analysis method has high sensitivity and high precision and can be used for quantitative analysis of the related substances in the IDH1 mutant inhibitor.

The invention aims to protect an organic potassium phosphate liquid fertilizer and a preparation method thereof. The liquid organic potassium phosphate is obtained by esterification of orthophosphoric acid and binary or trihydric alcohol and salt formation with potassium carbonate or potassium hydroxide, can replace inorganic potassium hydrogen phosphate and potassium dihydrogen phosphate to be used as a fertilizer, has excellent leaf affinity, can be quickly absorbed at leaves and roots, enters plants and does not need to be converted into phospholipid, and the organic potassium phosphate can be used as an organic fertilizer. The phosphate can be directly utilized after being absorbed by plants, so that the absorption and utilization rate of phosphorus and potassium is effectively improved, and the effect is quick; meanwhile, the stability of phosphorus is improved, the phosphorus and medium trace elements are not prone to generating precipitates, the phosphorus can be well mixed with pesticides, the fertilizer is suitable for modern fertilization modes such as unmanned aerial vehicle flight prevention, and the defect that leaves are damaged due to traditional high-concentration application of monopotassium phosphate is overcome. The method has the advantages of mild reaction, operation at normal temperature, no need of heating and simple synthesis steps, and is suitable for industrial production and large-scale popularization and application.

The utility model relates to the technical field of tail gas treatment, and discloses an ammonia gas recovery treatment device for diammonium hydrogen phosphate production, which comprises a tower body, the bottom of the tower body is fixedly connected with a base, the top of the base is provided with a circulating component, and the middle of the base is provided with a collecting component; the circulating assembly comprises a water tank, the water tank is fixedly connected to the top of the base, a water pipe is fixedly connected to the middle of the water tank, and a circulating pump is arranged in the middle of the water pipe. According to the utility model, water in the water tank is sprayed out from the spray head through the water pipe and the spray pipe by the circulating pump, so that the contact area with ammonia gas is increased, the driving motor drives the spiral stirring blade to rotate, the collected ammonia water is stirred, the ammonia gas can be more fully absorbed by the water, and then water vapor is separated out through the gas-liquid separator; the flange plate is externally connected with the ammonia gas collecting tank, so that the ammonia gas recycling efficiency is further improved.

The application discloses a novel modified biochar and a preparation method and application thereof, and preparation comprises the following steps: placing calcium-rich solid waste raw materials in a crusher for crushing treatment, fully mixing the biochar with the removed dissolved organic matter at a mass ratio of 1:(1-4), adding pure water at a mass-volume ratio of 1g:(60-100)mL, and adding diammonium hydrogen phosphate and ammonium dihydrogen phosphate at a calcium-phosphorus ratio of 1:(2.5-3.34); all raw materials are placed in a ball mill jar, the mass ratio of the raw materials to zirconia balls before ball milling is 1:(10-15), and ball milling is carried out at a rotating speed of 250-600 r / min for 6-12 h; the biochar slurry after ball milling is moved to a centrifuge tube, and centrifugation is carried out at a rotating speed of 5000 r / min for 10 min; the solid precipitate is washed with pure water for 3 times to remove excessive phosphate, and is placed in an oven for drying, so as to obtain the ball-milled novel modified biochar; the novel modified biochar has the advantages of simple synthesis method, low energy consumption, easy separation by using a centrifuge, and high adsorption performance on heavy metals.

A fire extinguishing liquid is described which includes one or more of a phosphate, hydrogen phosphate or dihydrogen phosphate salt; and a sulphate salt. The fire extinguishing liquid contains no, or substantially no, hydrogen carbonate salts. The liquid finds use in the extinguishment of fires, including battery fires.