3830 results about "O-Phosphoric Acid" patented technology

The invention discloses an ultra-aeration air flotation system and an implementation method thereof, and belongs to the technical field of wet-process phosphoric acid production, and the ultra-aeration air flotation system comprises a reaction tank, an inclined guide plate arranged on the inner wall of the reaction tank, a dish-shaped tank which is arranged at the bottom of the reaction tank and is annularly arranged around the center of the reaction tank, and a central island which is formed by protruding the inner ring part of the dish-shaped tank at the bottom of the reaction tank, the aeration mechanism is arranged on the central island and is communicated with the outside through a pipeline; the transmission mechanism is arranged above the reaction tank; the central transmission rod is connected with the output end of the transmission mechanism and is arranged along the axis of the reaction tank; the dynamic settler is arranged at the upper part in the reaction tank and is connected with the central transmission rod; and the overflow port is matched with the dynamic settler. The inclined guide plate, the dish-shaped aeration structure and the dynamic settler are integrally arranged in the reaction tank, so that the super-aeration uniformity, the foam separation capacity, the phosphoric acid purification and the liquid vortex intensity in the wet-process phosphoric acid production process are remarkably enhanced, and the reaction efficiency and the product quality are improved.

The invention relates to the technical field of phosphoric acid production control, solves the problem that in the prior art, accurate control over the whole process of phosphoric acid production cannot be achieved, and provides a multivariable model prediction control method and system for the whole process of phosphoric acid production. The method comprises the following steps: acquiring key process data of a plurality of process units in the whole phosphoric acid production process in real time; preprocessing the key process data to obtain real-time standardized data; establishing a soft measurement model according to a pre-collected historical standardized data set; inputting the real-time standardized data into the soft measurement model to obtain a soft measurement predicted value; constructing a multivariable dynamic model according to the historical standardized data set and the soft measurement predicted value; according to the multivariable dynamic model, in combination with a model prediction control algorithm, obtaining target set values of a plurality of preset operation variables; and according to the target set value, realizing control of the whole process of phosphoric acid production. According to the invention, accurate control of the whole process of phosphoric acid production can be realized.

The invention relates to the technical field of preparation of iron phosphate materials, in particular to a method for doping iron phosphate with titanium, which comprises the following steps: 1, dissolving a titanium dioxide by-product ferrous sulfate powder in water to prepare a titanium-containing iron source solution; 2, adding water into the reaction kettle, and stirring; 3, adding the titanium-containing iron source solution, the phosphorus source solution, ammonia water and an oxidizing agent into a reaction kettle to prepare primary slurry; 4, carrying out filter pressing on the primary slurry, washing until the conductivity is less than or equal to 2000us / cm, and then adding water to prepare secondary slurry; 5, phosphoric acid is added into the reaction kettle for bottoming, and the temperature is increased to 60-70 DEG C; 6, adding the secondary slurry into the reaction kettle, and carrying out heat preservation reaction on the secondary slurry and phosphoric acid; and 7, filtering the reaction product obtained in the step 6, washing until the conductivity is less than or equal to 500us / cm, and then drying and sintering. According to the method, the titanium doping technological process is simplified, and meanwhile the titanium element utilization rate in the titanium dioxide by-product and the purity of the titanium-doped iron phosphate product are improved.

The invention discloses an anti-scale cross-linked polymer fracturing fluid and a preparation method thereof, and relates to the technical field of petroleum fracturing fluids. When the anti-scale cross-linked polymer fracturing fluid is prepared, allylamine hydrochloride and epoxy chloropropane react to prepare a double-bond chlorinated intermediate; reacting the double-bond chlorinated intermediate with lauramidopropyl dimethylamine to prepare a cationic monomer; copolymerizing a cationic monomer and acrylamide to prepare a cationic polymer; the preparation method comprises the following steps: reacting L-lysine with formaldehyde and phosphorous acid to prepare phosphoric acid modified lysine; reacting the phosphoric acid modified lysine with allyl glycidyl ether to prepare a phosphoric acid modified monomer; acrylamide and an anionic monomer are copolymerized to prepare an anionic polymer; the anionic polymer and the cationic polymer are dissolved in water to prepare the anti-scale cross-linked polymer fracturing fluid. The anti-scale cross-linked polymer fracturing fluid prepared by the invention has the advantages of scale prevention, good temperature resistance, good shear resistance and self-crosslinking.

The invention relates to the technical field of catalysts, and discloses a preparation method of a supported catalyst for catalytic cracking oil slurry hydrogenation, and the preparation method comprises the following steps: S1, adding a phosphorus-containing compound into a carrier for modification: putting the carrier, phosphate and phosphoric acid into a round-bottom flask, adding water, and stirring for reaction to obtain a P element modified carrier; s2, dissolving a main active component of the catalyst in deionized water, then slowly adding into the P element modified carrier prepared in the step S1, and reacting to obtain a carrier loaded with the catalyst; and S3, roasting the catalyst-loaded carrier prepared in the step S2 to obtain the supported catalyst. According to the supported catalyst, a phosphorus compound modified carrier is adopted, and Ni-W-Mo or Ni-W active metal components are supported. The acid site of the carrier is optimized by adding the phosphorus element, and the surface acidity and the acid amount of the catalyst are optimized and adjusted by using a preparation process combining a microwave method and a co-impregnation method, so that the thermal stability of the catalyst is improved.

The invention discloses a double-block polymeric monomer, a preparation method thereof and a polycarboxylic acid water reducing agent which uses the double-block polymeric monomer and is suitable for low-carbon cement. The polycarboxylate superplasticizer is formed by copolymerization of a double-block polymeric monomer A, an unsaturated carboxylic acid monomer B and a polymerizable phosphoric acid monomer C through free radicals, wherein the double-block polymeric monomer A is a polymeric monomer composed of an unsaturated multi-element heterocyclic chain segment near a double-bond end and a polyether polyol acrylate chain segment far away from the double-bond end. The polycarboxylic acid water reducing agent is suitable for low-carbon cement, solves the problems of weak dispersion and poor adaptability of the existing water reducing agent in the application process of the low-carbon cement, and is more suitable for low-carbon cement concrete containing various complex admixtures such as slag, clay and the like.

The invention discloses a production method of ferrous dihydrogen phosphate, which comprises the following steps of: changing an iron source of iron-process iron phosphate from traditional iron blocks or iron powder into oxide scale, compounding phosphoric acid and sulfuric acid into mixed acid, and controlling the granularity of the oxide scale and the components and acidity of the mixed acid to solve the problems of dissolution and passivation of the oxide scale. According to the method, iron oxide scale can be better dissolved, the residual problem of ferric ions is solved by reducing excessive iron blocks or iron powder, undissolved impurities such as carbon, silicon and iron are removed by filtering, and finally, the stability problem of a reaction system is solved by adjusting the pH value of the system through industrial phosphoric acid and pure water, so that a ferrous dihydrogen phosphate solution required for producing iron phosphate is obtained. The production cost of an iron source required by iron phosphate is greatly reduced, other impurities are not contained, and mixed acid-containing filtrate and washing water generated in the production process can be recycled through an evaporation device.

The invention discloses a composite water purifying agent based on polyaluminum ferric sulfate. The preparation process comprises the following steps: 1, reacting ferrous sulfate heptahydrate, aluminum sulfate, sodium chlorate, phosphoric acid and the like to prepare a polyaluminum ferric sulfate solution; 2, mixing the modified polyacrylamide solution with the polyaluminum ferric sulfate solution for reaction to obtain a composite system; and step 3, adding acidic ochre soil into the composite system to obtain the composite water purifying agent. The preparation method has the beneficial effects that a modified monomer is prepared through organic synthesis, and the modified monomer is copolymerized with monomers such as acrylamide to prepare modified polyacrylamide; then, the organic polymer is compounded with a polyaluminum ferric sulfate solution and acidic ochre soil, and an inorganic-organic-mineral ternary water purification system is constructed; the composite water purifying agent has the high-efficiency electricity neutralization capability of an inorganic flocculating agent, the bridging flocculation effect of organic macromolecules and the adsorption performance of minerals, and shows excellent flocculation and sedimentation effects and pollutant removal capability.

The invention belongs to the technical field of phosphoric acid purification, and particularly relates to a removing agent and a removing method for heavy metal cadmium in phosphoric acid. The removing agent comprises a solvent, a thiophosphoric acid trapping agent A and a thiophosphoric acid trapping agent B, wherein the thiophosphoric acid trapping agent A and the thiophosphoric acid trapping agent B are dispersed in the solvent; the thiophosphoric acid trapping agent A and the thiophosphoric acid trapping agent B are different types of thiophosphoric acid trapping agents and are respectively and independently selected from one of alkyl dithiophosphoric acid or salts thereof, phenolic dithiophosphoric acid or salts thereof and amino dithiophosphoric acid or salts thereof; and at least one hydrocarbyl dithiophosphoric acid or salt thereof is selected; the salt is sodium salt or ammonium salt; the solvent is water or an alkaline aqueous solution. According to the method, a composition of a dithiophosphoric acid trapping agent is used as a removing agent for cadmium in wet-process phosphoric acid, a precipitate which is insoluble in a strongly acidic water phase is generated after reaction, and phosphoric acid cadmium removal is realized after filtration. Compared with a conventional sulfide precipitation method, the method provided by the invention has the advantages of less cadmium residue in phosphoric acid and less pollution.

The present application discloses a method for recovering battery-grade iron phosphate and lithium salts from lithium iron phosphate waste materials and its application, comprising the following steps: S100, dissolving the lithium iron phosphate waste materials with a phosphoric acid solution, filtering to obtain a waste material dissolution solution; S200, adding an acid solution and an oxidant to the waste material dissolution solution to obtain a crystallization stock solution; S300, diluting the crystallization stock solution with water until its pH value is 1.0 to 1.5, and performing high-temperature crystallization to obtain hydrated iron phosphate and a lithium-containing filtrate; S400, roasting the hydrated iron phosphate to obtain battery-grade iron phosphate; S500, removing water from the lithium-containing filtrate to obtain solution a, circulating solution a to dissolve the lithium iron phosphate waste materials, and concentrating to obtain lithium salts. The present application uses a phosphoric acid solution as the leaching solvent, does not require the use of an alkali solution subsequently and can be leached cyclically, improving the economic benefits while enabling the efficient recovery of all elements of Li, Fe, and P, and also capable of obtaining a battery-grade iron phosphate product with an iron-to-phosphorus ratio meeting the requirements.

The preparation method comprises the following steps: S1, preparing a phosphoric acid solution, a hydrogen peroxide solution, a Ti salt, a phosphor salt solution and a ferrite solution; s2, Ti salt and the ferrite solution are mixed, and a titanium iron salt solution is obtained; mixing the phosphoric acid solution and the phosphorus salt solution to obtain a phosphorus source solution; s3, adding the titanium iron salt solution into a reaction kettle, and adding the hydrogen peroxide solution; s4, adding the phosphorus salt solution into the reaction kettle to obtain yellow slurry; s5, after the color of the slurry is heated to be white, white slurry is obtained; s6, carrying out solid-liquid separation on the white slurry to obtain an iron phosphate dihydrate filter cake; and S7, drying and calcining the iron phosphate dihydrate filter cake to obtain the Ti-doped battery-grade anhydrous iron phosphate. The titanium-doped iron phosphate is firstly prepared by a one-step method, the pH value of the reaction system is controlled by controlling the molar ratio of the iron element to all phosphorus elements in total phosphorus, ammonium phosphate and phosphoric acid in the reaction system, and the retention of the Ti element in the finished product and the regulation and control of the iron-phosphorus ratio in a specified range are ensured.

The invention relates to the technical field of polyethylene cables, in particular to a high-strength flame-retardant polyethylene cable and a preparation method thereof.The high-strength flame-retardant polyethylene cable is composed of a copper stranded wire core and a flame-retardant protective layer on the surface of the copper stranded wire core; the flame-retardant protective sleeve is made of a high-strength flame-retardant material; the high-strength flame-retardant material comprises the following components in parts by weight: 80-100 parts of low-density polyethylene, 5-10 parts of a flame retardant, 3-5 parts of a performance additive, 1-1.5 parts of filler, 0.1-0.2 part of a voltage stabilizer, 0.1-0.5 part of an antioxidant, 0.5-1 part of an initiator and 1-5 parts of a lubricant. The amino group on the surface of the silicon dioxide carrier treated by 3-aminopropyltriethoxysilane in the modification additive can be subjected to acid-base interaction with the phosphate group of APP to form chemical bridging; the interface bonding enables the APP and the modification additive to synchronously migrate to the surface of the material during combustion to cooperatively construct a protection layer, so that the problem of protection failure caused by migration rate difference of different flame retardants in a traditional flame-retardant system is solved, and the flame-retardant performance of the cable can be greatly improved.

The invention provides phosphorus-doped hydrothermal synchronously-activated hierarchical pore green biochar, a preparation method thereof and application of the phosphorus-doped hydrothermal synchronously-activated hierarchical pore green biochar in formaldehyde adsorption, and belongs to the technical field of biomass resource high-value utilization and air pollution control. The preparation method comprises the following steps: mixing a biomass raw material with a phosphoric acid catalyst, carrying out hydrothermal carbonization reaction, carrying out solid-liquid separation on a reaction product after the reaction is finished, collecting a solid-phase material, drying, mixing with potassium hydroxide, activating, washing and drying the obtained product, and thus obtaining the phosphorus-doped hydrothermal synchronously-activated hierarchical porous green charcoal. Phosphoric acid is introduced in the hydrothermal stage to serve as a structure-directing agent and a doping source, uniform doping of phosphorus and coordinated regulation and control of a pore structure are achieved, a hierarchical pore channel system is formed in the subsequent activation process, and the physical adsorption and chemical fixation capacity of the biochar to formaldehyde molecules is greatly improved.

The present invention relates to a composite high-temperature proton exchange membrane, a preparation method thereof, and an application thereof. The preparation method of the composite high-temperature proton exchange membrane comprises the following steps: S1. Mix a polymer represented by formula (I), a polymer represented by formula (II), and a solvent to obtain a casting solution, pour it, and dry it to obtain a composite film; S2. Immerse the composite film obtained in step S1 in an alkaline solution of borax, wash it, dry it, and then adsorb phosphoric acid to obtain the composite high-temperature proton exchange membrane. The composite high-temperature proton exchange membrane prepared by the preparation method of the present invention still maintains good proton conductivity / has high proton conductivity, has a high peak power density, and has high tensile strength and high phosphoric acid retention rate under the condition of low phosphoric acid adsorption amount.

The invention discloses a phosphorus-nitrogen flame retardant and a preparation method and application thereof.The preparation method of the flame retardant comprises the steps that phosphoric acid is added into a PEPA solution, and after a heating reaction, the mixture is cooled to the room temperature; and adding urea, carrying out secondary heating reaction, and washing, separating and drying after the reaction is finished. The prepared flame retardant not only can significantly improve the flame retardant property and thermal stability of cotton fabrics, but also has good environmental friendliness and practical application potential, and provides a new idea for development of high-performance flame-retardant cotton fabrics.

The invention belongs to the field of hydrometallurgy, and particularly relates to a method for extracting niobium and / or scandium in a phosphoric acid solution system, which is characterized in that the phosphoric acid solution system containing niobium and / or scandium and an extraction organic phase are subjected to auxiliary extraction under a composite field of ultrasonic-magnetic field to obtain a loaded organic phase. Innovative research shows that extraction is carried out under an ultrasonic-magnetic field composite field, the final physicochemical characteristics of niobium-scandium in a phosphoric acid solution can be adapted accidentally, excellent extraction capacity can be obtained accidentally, and especially excellent scandium-niobium separation selectivity can be obtained under a composite phosphoric acid system containing niobium and scandium.

The invention discloses a heat dissipation type anti-corrosion coating and a preparation method thereof, and belongs to the technical field of anti-corrosion coatings. The heat dissipation type anticorrosive paint comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 100 parts of heat-conducting water-borne epoxy resin, 4-6 parts of graphene, 0.3-0.5 part of an antioxidant, 0.2-0.4 part of a defoaming agent, 0.2-0.4 part of a flatting agent and 10 parts of first deionized water; the component B comprises the following components in parts by mass: 10-20 parts of a curing agent, 40-60 parts of a toughening agent, 4-6 parts of functionalized boron nitride microspheres and 30-50 parts of second deionized water; the heat-conducting water-borne epoxy resin is 1, 5-naphthalene diphenol modified water-borne epoxy resin; the curing agent is an aromatic amine curing agent; the toughening agent is obtained by carrying out copolymerization on acrylamide, N-(4-aminophenyl) acrylamide, 1, 3, 5-triacryloyl-s-triazine and 3-dimethylamino allyl phosphoric acid; the functionalized boron nitride microspheres are boron nitride microspheres modified by 4-aminobenzoic acid.

This invention belongs to the field of wastewater treatment technology, specifically relating to a method for removing metallic impurities from acidic copper-containing etching wastewater at room temperature and pressure. The method includes the following steps: S1, adding an oxidant to the acidic copper-containing etching wastewater to conduct an oxidation-reduction reaction, obtaining a pretreatment solution; S2, adding phosphoric acid or soluble phosphate to the pretreatment solution, adjusting the pH to 1.3-1.7 using a pH adjuster, stirring, and filtering to obtain a purified copper-containing solution. The method provided by this invention achieves high removal rates for Fe, Ni, Zn, Ca, and Mg, while maintaining a high copper ion content. It can recycle and regenerate high-purity copper salt products for application in food, cosmetics, medical, electroplating, and other fields, while also reducing hazardous waste generation, improving economic efficiency, and significantly reducing costs.

The invention relates to a method for treating a waste iron phosphate positive electrode material by a phosphoric acid-hydrogen peroxide method matched with a specific complexing agent. The method comprises the following steps: crushing the positive electrode material of the waste lithium iron phosphate battery, adding the crushed positive electrode material into deionized water, and stirring to prepare slurry; heating the slurry, dropwise adding a phosphoric acid-hydrogen peroxide mixed solution and a complexing agent, adding a NaOH solution to adjust the pH value to 3.5, and filtering to obtain a filtrate and a filter cake; adding a NaOH solution into the filtrate, and adjusting the pH value to 10 to obtain lithium phosphate; performing evaporative crystallization on the filter cake to obtain trisodium phosphate; the complexing agent is prepared by adding pentasodium salt of amino trimethylene phosphonic acid, triallyl citrate, epoxysuccinic acid and DMF (Dimethyl Formamide) into a reaction kettle, mixing, adding ammonia water to adjust the pH value to be 10, and distilling to remove the DMF after the reaction is finished. The precipitation rate of Fe reaches up to 99.99%, the leaching rate of Li reaches up to 99.91%, and efficient separation and recycling of lithium and iron are achieved.

The invention relates to a compound, a preparation method, a hole transport layer material, a photovoltaic device and a photovoltaic module. R1 and R4 are respectively and independently selected from amino and derivatives thereof, hydroxyl and derivatives thereof, methoxyl and derivatives thereof, sulfydryl and derivatives thereof, methylthio and derivatives thereof, thiophene groups and derivatives thereof, phosphate groups and derivatives thereof, carboxylic acid groups and derivatives thereof, and sulfonic acid groups and derivatives thereof; r2 and R3 are independently selected from alkyl, a phosphate group and derivatives thereof, a carboxylic acid group and derivatives thereof, a sulfonic acid group and derivatives thereof, and trimethoxysilyl propyl and derivatives thereof. The material is beneficial to improving the photoelectric conversion efficiency of photovoltaic devices and photovoltaic modules.

The utility model discloses an SF type flotation machine for phosphoric acid beneficiation. The SF type flotation machine comprises a groove body, a power system, a center cylinder, a stirring system and a scraper system. The air distributor is arranged to uniformly distribute the sucked air, so that a large amount of fine bubbles can be formed, and the generation of the bubbles is further facilitated; the slurry on the dispersing cover can be sucked into an upper impeller cavity through the through holes, so that slurry upper circulation is formed; the backward-inclined lower blade and the backward-inclined upper blade are arranged, so that slurry in the tank is subjected to upper and lower double circulation, and the suspension of coarse-grain minerals is facilitated; a large gap between the impeller and the dispersion cover is arranged, and the air suction amount is large. The ore pulp and air are self-sucked, the air suction amount is large, the number of auxiliary devices is small, and operation and maintenance are easy.

The invention relates to the technical field of protective glue, in particular to extreme high and low temperature impact resistant UV (ultraviolet) photocuring electronic protective glue which is prepared from the following raw materials in parts by weight: 30-50 parts of synergistically modified epoxy-urethane acrylate oligomer, 20-35 parts of composite active monomer, 1.5-5 parts of composite photoinitiator and 10-20 parts of core-shell structure inorganic composite filler, 0.6 to 2.2 parts of a silane coupling agent, 0.12 to 1.1 parts of an antioxidant and 0.11 to 1 part of a leveling agent; the preparation method of the synergistically modified epoxy-urethane acrylate oligomer comprises the following steps: reacting resin acid modified epoxy resin with phosphoric acid di (hydroxyethyl acrylate) ester at 80-90 DEG C, and introducing a phosphate group to obtain a phosphate modified epoxy acrylate intermediate; the protection glue unifies rigidity, flexibility and flame retardance on the molecular level through the cooperation of the hybrid oligomer and the core-shell filler, realizes high heat conductivity, strong adhesion and extremely low internal stress, and has extreme temperature impact resistance, long-term damp-heat aging resistance and high-reliability protection performance.

The invention relates to the technical field of phosphoric acid production, in particular to an intelligent optimization management method for phosphoric acid production process parameters. Obtaining adaptive window ranges at different moments according to data change characteristics of the phosphoric acid concentration sequence; obtaining a phosphoric acid production benefit value according to the phosphoric acid concentration in the self-adaptive window range; obtaining a benefit reference value according to the phosphoric acid production benefit value in the historical batch production process; obtaining a benefit comparison value according to the phosphoric acid production benefit value at the current moment and a benefit reference value; judging whether the production process is adjusted according to the benefit contrast value; obtaining a parameter deviation coefficient according to the difference characteristic of the sulfuric acid concentration of the production process corresponding to the benefit reference value and the current production process; and according to the parameter deviation coefficient and the benefit contrast value, obtaining a phosphorite putting amount difference coefficient. According to the parameter deviation coefficient, the phosphorite feeding amount difference coefficient and the benefit contrast value, the sulfuric acid concentration or the phosphorite feeding amount at the current moment is iteratively adjusted, and the quality of the phosphoric acid production process is improved.

The invention discloses a preparation method of a sodium ferromanganese vanadium phosphate material of a sodium battery positive electrode. The preparation method comprises the following steps: S1, preparing a hydrophosphate solution and a manganous salt solution; and S2, adding the hydrophosphate solution into the manganous salt solution, and reacting to obtain the manganous hydrogen phosphate crystal nucleus slurry. And S3, filtering and washing the manganese hydrogen phosphate crystal nucleus slurry, adding water into the manganese hydrogen phosphate material to prepare slurry, heating to 85-95 DEG C, respectively adding a ferrous source and a phosphorus salt solution, and reacting to obtain the manganese iron hydrogen phosphate slurry. And S4, filtering, washing and drying the iron manganese hydrogen phosphate slurry, adding water into the dried slurry to prepare slurry, adding phosphoric acid, heating to 90-100 DEG C, reacting to obtain an iron manganese phosphate compound precipitate, and filtering, washing and drying the precipitate to obtain an iron manganese phosphate material. The sodium manganese iron vanadium phosphate product is prepared by adopting a coprecipitation method and high-temperature sintering, and the method has the advantages of short process flow, simple process, only one-time sintering, low energy consumption and the like.

The present invention discloses a super-aeration flotation system and its implementation method, belonging to the technical field of wet-process phosphoric acid production. The system comprises a reaction tank, an inclined guide plate arranged on the inner wall of the reaction tank, a dished trough arranged at the bottom of the reaction tank and arranged in a ring shape around its center, a central island formed by a protrusion of the inner ring portion of the dished trough at the bottom of the reaction tank, an aeration mechanism arranged on the central island and connected to the outside through a pipeline, a transmission mechanism installed above the reaction tank, a central transmission rod arranged along the axis of the reaction tank and connected to the output end of the transmission mechanism, a dynamic settler arranged at an upper position in the reaction tank and connected to the central transmission rod, and an overflow port matched with the dynamic settler. By integrating the inclined guide plate, the dished aeration structure and the dynamic settler in the reaction tank, the present invention significantly enhances the super-aeration uniformity, foam separation ability, phosphoric acid purification and liquid vortex intensity in the wet-process phosphoric acid production process, thereby improving reaction efficiency and product quality.

The invention discloses a construction method of a gout compound decoction fingerprint as well as the fingerprint and application thereof, and belongs to the technical field of analysis and detection. The construction method of the fingerprint spectrum comprises the following steps: taking a test solution prepared from the gout compound decoction; the test solution is subjected to HPLC-SPD detection, so that the fingerprint spectrum of the gout compound decoction is obtained, and the HPLC detection conditions are that a C18 chromatographic column is used, a C18 chromatographic column is used, a C18 chromatographic column is used, a C18 chromatographic column is used, and a C18 chromatographic column is used for detecting the fingerprint spectrum of the gout compound decoction. An aqueous solution containing 0.1%-0.2% of phosphoric acid is used as a mobile phase A, and acetonitrile is used as a mobile phase B for gradient elution; the flow velocity is 0.8-1 mL / min, the column temperature is 25 DEG C, the sample injection volume is 5-10 [mu] L, and a diode array detector is 190-400 nm full-wave band scanning. The chemical components in the gout compound decoction are comprehensively and systematically analyzed, and a basis is provided for quality control and in-depth study of a pharmacodynamic material basis.

The invention discloses a preparation process of a high-toughness anti-cracking alkali-activated geopolymer cementing material, which comprises the following steps: (1) mixing steel slag powder and a phosphoric acid solution, heating, preserving heat, reacting, drying to remove moisture, and grinding to obtain pretreated steel slag powder; and (2) uniformly mixing brucite powder, potassium silicate and water to form slurry, then adding basalt fibers into the heated slurry, standing, separating out the fibers after standing, uniformly mixing the fibers with the pretreated steel slag powder, and drying to obtain pretreated fibers. And (3) placing the pretreated fiber in a closed container containing carbon dioxide and water vapor, and carrying out heat preservation and maintenance to obtain the modified fiber. And (4) weighing the following raw materials according to the following proportion: aluminum-silicon solid waste micro powder, coarse aggregate, fine aggregate, the modified fiber, an alkali activator and a water reducing agent. The preparation method comprises the following steps: uniformly mixing the raw materials, adding water and uniformly stirring. The fiber subjected to surface treatment effectively improves the crack resistance of the geopolymer cementing material.

The invention discloses a method for separating iron and lithium in a lithium iron phosphate iron salt leaching solution and recycling iron phosphate, and belongs to the technical field of waste lithium battery recycling. The method comprises the following steps: constructing a bis (2-ethylhexyl) phosphate and trioctyl decyl tertiary amine mixed extraction system for selective extraction of Fe < 3 + >, adopting phosphoric acid for reverse extraction, recycling phosphoric acid reverse extraction liquid, preparing iron phosphate and the like. According to the method, efficient enrichment of Fe < 3 + > and efficient elution of Fe < 3 + > from a loaded organic phase are realized. The purity of the raffinate Li solution is relatively high, so that the subsequent preparation of battery-grade lithium carbonate is facilitated. The strip liquor can be recycled for multiple times, an iron intermediate is precipitated through pH adjustment, and the FePO4 product can be finally prepared through washing, aging and high-temperature calcination. The method is high in extraction selectivity, recyclable in process and mild in operation condition, has good separation effect and resource utilization efficiency, and is suitable for popularization and application of a Fe / Li separation process in lithium battery recovery.

The invention provides a preparation method of grain size grading iron phosphate and high compaction type lithium iron phosphate. Removing impurities from the titanium dioxide byproduct ferrous sulfate, and filtering to obtain a purified ferrous sulfate base solution; the method comprises the following steps: reacting phosphoric acid with ammonia water to prepare ammonium phosphate solutions with different reaction pH values and phosphorus molar concentrations, respectively mixing the ammonium phosphate solutions with a certain amount of hydrogen peroxide, and sequentially adding an iron source, a first phosphorus salt solution, a second phosphorus salt solution and a third phosphorus salt solution into a tubular reactor for reaction to obtain iron phosphate slurry; and sequentially converting, filtering, washing, drying and calcining the completely reacted slurry to finally prepare the anhydrous iron phosphate. According to the invention, a mode of controlling solution nucleation and growth is adopted, nucleation and growth rates are controlled by preparing phosphorus salt solutions with different concentrations, size grading of precursor particles is directly realized in a synthesis reaction section, and slurry grading uniformity is further realized through aging crystal transformation. Lithium iron phosphate prepared from the iron phosphate precursor has high compaction density.

The invention belongs to the field of mineral treatment, and particularly relates to a method for selectively leaching niobium from niobium-titanium rare earth bulk concentrate, which comprises the following steps: leaching the niobium-titanium rare earth bulk concentrate by using a buffer solution dissolved with phosphoric acid-sodium phosphate as a leaching agent to obtain a niobium leaching solution and leaching residues enriched with titanium-rare earth; wherein the temperature in the leaching stage is 120-190 DEG C. According to the method, the buffer solution of phosphoric acid-sodium phosphate is innovatively adopted as the leaching agent, and combined control over the leaching temperature is further matched, so that the surface physicochemical characteristics of the niobium-titanium-rare earth bulk concentrate can be adapted, and selective leaching of niobium and separation of titanium-rare earth are achieved.