204results about How to "Improve complexation effect" patented technology

The present invention discloses one kind of heat resistant filter material and its use. The heat resistant filter material consists of one base material layer and one combined filter layers, the base material layer is made of inorganic fiber and / or heat resistant organic fiber, and at least one filter layer contains both inorganic fiber and heat resistant organic fiber, with the diameter of the inorganic fiber being smaller than that of the heat resistant organic fiber. The heat resistant filter material is used in filter. It has excellent complexing performance between the inorganic fiber and the heat resistant organic fiber, high dust collecting efficiency, high dust impact resistance, high antiwear performance, high heat shrinkage tolerance, etc.

The invention discloses a coating method for a core-shell novel positive electrode material for a lithium ion battery. A uniform core-shell structure is formed by effective compounding two materials with electrochemical activity; and an effect for enhancing electrochemical performance of the materials is achieved by improving interface state of the materials and reducing side reactions. The coating method comprises the following steps of dispersing the positive electrode material for the lithium ion battery in deionized water and auxiliarily dispersing in a certain manner to obtain a slurry; dissolving a lithium source, an iron source, a phosphate radical source and a chelating agent in water; stirring for 1 hour at a room temperature to obtain a sol; adding the slurry obtained in the first step in the sol; adjusting a pH; then heating to a temperature of 80 DEG C; keeping the temperature for 1-12 h to form a gel; then drying the gel at a temperature of 100 DEG C; sintering the dry gel obtained by the former step for 1-10 hours at a temperature of 600-900 DEG C under the protection of nitrogen; and cooling to a room temperature naturally, so that the core-shell novel positive electrode material for the lithium ion battery is obtained.

The invention relates to high-temperature sea water-base fracturing liquid suitable for the formation temperature of 160 DEG C. The high-temperature sea water-base fracturing liquid is prepared by reacting base liquid and a crosslinking agent, wherein the base liquid comprises the following raw materials in parts by weight: 96-98 parts of sea water, 0.5-1.0 part of a thickening agent, 0.8-1.5 parts of a chelated regulator, 0.3-1.0 part of a temperature stabilizing agent, 0.1-0.5 parts of a surfactant, 0.01-0.05 part of a gel breaker and 0.5-1.5 parts of a crosslinking agent. The application further relates to a preparation method of the high-temperature sea water-base fracturing liquid. The high-temperature sea water-base fracturing liquid has good compatibility with sea water, excellent tolerance and complexation property for various high-valent and variable-valent metal ions, such as Ca<2+>, Mg<2+> and Fe<3+> in sea water, and is capable of overcoming or reducing harm caused by secondary precipitation.

The invention provides a conductive coating material for a lithium ion battery. The conductive coating material comprises components in parts by weight as follows: 100 parts of a conductive agent, 20-150 parts of a binding agent, 0-30 parts of polyvinylpyrrolidone and 500-10,000 parts of water, wherein in terms of 100 parts by weight of the conductive agent, the conductive coating material further comprises components of 70-100 parts by weight of conductive carbon black and 0-30 parts by weight of carbon nano-tubes. The invention further provides a preparation method of the conductive coating material and the lithium ion battery adopting the conductive coating material. The conductive coating material is safe and environment-friendly, has good stability after dispersed and can improve the electrochemical performance of the lithium ion battery remarkably.

The invention provides a hydroximic acid-type polymeric flocculant for removing heavy metal ions in sewage and the macromolecule thereof has three chains of different structures; the first chain is at least one out of an acrylamide or a derivative thereof, wherein the total weight percentage of the monomer is 10-90wt%; the second chain is at least two out of a carboxylic acid, sulfonic acid and hydroximic acid compound, wherein the total weight percentage of the monomer is 5-60wt%; the third chain is at least one out of a sulfur-contained, oxygen-contained or amido-contained lipid compound, wherein the total weight percentage of the monomer is 1-20wt%. The flocculant can effectively remove the heavy metal ions in sewage of electroplating, electronic and heavy metal industries, such as iron, copper, zinc, chrome, nickel, and the like, and the removal rate is more than 98%.

The invention provides a preparation method of an organic chelate fertilizer. The preparation method comprises the steps that (1) typha angustifolia and crop straw are cleaned, crushed and mixed; compound bacterium liquid and a sodium bicarbonate solution are added; stirring and sealing fermentation are conducted; a potassium hydroxide solution is added; humic liquid is obtained; (2) compound amino acid and inorganic salt of medium trace elements conduct chelation reaction with the humic liquid; a pH value is adjusted by an acid solution to be 5-6; temperature rise and stirring are conducted for reaction; the pH value is adjusted by an alkaline substance to be 7; a chelation product solution is obtained; (3) a nitrogenous fertilizer, a phosphate fertilizer, a potash fertilizer and water are added to a mixer by weight percentage, and mixed uniformly; pelleting slurry is prepared; and (4) the chelation product solution and the pelleting slurry are driven into a guniting neutralization geosyncline, mixed uniformly, transferred to a pelletizer for guniting and pelleting, and dried, and then the organic chelate fertilizer is obtained. The organic chelate fertilizer prepared by the method is small in application amount, high in stability, and high in plant absorptivity.

The invention relates to a bath solution preparing method and a low-concentration weakly alkaline cyanide-free copper plating which can ensure that the bonding force exists between a plating layer and a matrix, the plating solution has best stability, better dispersing capacity and deep plating capacity and simple process maintenance. The low-concentration weakly alkaline cyanide-free copper plating comprises a main salt, a conductive salt, a main complexing agent and a secondary complexing agent, wherein the main salt is copper chloride, the conductive salt comprises a mixture of sodium chloride, potassium chloride and ammonium chloride, the main complexing agent is a mixture of tartrate, citrate, nitrilotris(methylene)]tris-phosphonic acid salt, (1-Hydroxyethylidene)bis-phosphonic acid tetrasodium salt and ethylenediamine tetra(methylenephosphonic acid) salt; and the secondary complexing agent is a mixture of ortho-hydroxybenzoic acid, succinimide and derivatives thereof and dimethyl hydantoin. The invention has the advantages of capability of ensuring the bonding force of the plating and the matrix, best stability and better dispersing capacity and deep plating capacity and simple process maintenance.

The invention belongs to the technical field of mesoporous material preparation, in particular to a mercapto-functionalized organic inorganic hybrid ordered mesoporous silicon material and a synthesizing method thereof. The material has high content of mercapto functional group (0.1 to 15 weight percent), high specific surface area (200 to 500m<2> / g), large pore volume (0.1 to 1.0cm<3> / g), and uniform pore diameter (3 to 12nm), and has a two-dimensional hexagonal mesoscopic structure. The synthesizing method comprises the following steps: carrying out prehydrolysis on an inorganic silicon source and a mercapto-containing organic silicon sources under an acidic condition to form a silicon source precursor; mixing the precursor with nonionic surfactant, adding soluble resin in the mixture, and carrying out self-assembly in the organic solution to obtain the mercapto functionalized-nonionic surfactant composite material; and removing the surfactant through solvent reflux extraction. The material has simple operation and low cost, can be used as an adsorbent for heavy metal ions in wastewater, and opens a new way for treatment of industrial wastewater containing heavy metal.

The invention relates to a neutral blocking remover composition for oilfield oil extraction, which is prepared from the following components in parts by weight: 30-35 parts of acrylic acid-methyl acrylate copolymer, 44-50 parts of diethylene triamine pentaacetic acid, 30-35 parts of sodium polyepoxysuccinate, 30-35 parts of amine malate, 10-14 parts of sodium alkyl sulfonate, 5-8 parts of amine hydroxy ethylidene diphosphate, 10-14 parts of hydrolyzed polyacrylamide, 12-17 parts of atlapulgite, 20-25 parts of sodium persulfate, 7-10 parts of sodium lignosulfonate, 5-8 parts of tannin, 12-16 parts of sodium malate, 5-8 parts of sodium sulfosuccinate, 5-8 parts of starch, 9-12 parts of methyl lactate, 0.2-0.3 part of vanadium pentoxide and 0.1-0.3 part of diisobutyl carbinol. The neutral blocking remover composition for oilfield oil extraction has the advantages of high blocking removal speed, no corrosivity due to neutrality and no dead area, can quickly dissolve the material scales, clean the oilfield stratum and remove blocking, and does not generate the phenomenon of precipitation or secondary blocking; and the cleaning waste liquid does not need to be subjected to sewage treatment after returning to the ground.

The invention relates to a polymeric silicic acid-polyferric sulfate titanium inorganic macromolecular composite flocculant and a preparation method and an application thereof. The alkalinity (B) of the composite flocculant is 0.5-1.5, and the composite flocculant is prepared by mixing a polymeric silicic acid solution with concentration of 0.08-0.12 mol / L with a polyferric sulfate titanium solution with concentration of 8-15 g / L according to a Si / Ti mol ratio of (0.02-0.1):1. The composite flocculant has the advantages of strong adsorption bridging ability on colloid matters, good flocculation effect, wide application range, less sludge generation amount and the like, thereby being capable of being extensively applied in such fields as water supply, waste water treatment, papermaking, textile dyeing and finishing and daily-use chemical industry, and the water treatment effect is good.

The invention relates to the field of preparation methods of polyetheramine, and especially relates to a hyperbranched polythioether polyamine, and a preparation method and a use thereof. The preparation method is simple, raw materials are nontoxic and are easy to obtain, cysteamine hydrochloride can be prepared through hydrolyzing human and animal hair, alkynyl glycidyl ether can be directly purchased, and the method also has the advantages of low requirements of devices involved in the preparation process, no special or strict conditions, and mild reaction conditions. The molecular periphery of the hyperbranched polythioether polyamine has a plurality of primary amino groups, so the hyperbranched polythioether polyamine can be used as an epoxy resin flexible curing agent; and hyperbranched polythioether polyamine hydrochloride which is the precursor of the hyperbranched polythioether polyamine has a strong fluorescence effect, a good antibacterial performance and a good sterilizing performance.

The invention provides a surface modification method of inorganic nanoparticles as well as a polytetrafluoroethylene / inorganic nanoparticle composite material. The method comprises steps as follows: firstly, adding the inorganic nanoparticles and polyethylene glycol 400 to deionized water, and performing ultrasonic dispersion to form a suspension; then adding rare earth nitrate and ethylenediaminetetraacetic acid disodium to the suspension, leaving the solution to stand after ultrasonic treatment at the room temperature, then adding trimethoxysilylpropanethiol, leaving the solution to stand after stirring, and performing centrifugal separation, drying and grinding to obtain the modified inorganic nanoparticles; finally, mixing the modified inorganic nanoparticles with polytetrafluoroethylene powder, preparing a blank through compression molding, and sintering the blank to prepare the polytetrafluoroethylene / inorganic nanoparticle composite material. The surface modification method is simple in process, wide in application range and good in modification effect. The interface binding force of the modified inorganic nanoparticles to polytetrafluoroethylene is enhanced, and the comprehensive mechanical property of the composite material is excellent.

The invention provides cyclodextrin derivatives that are substituted with groups bearing charges in aqueous solutions (charged cyclodextrins) in their salt forms and their use, also in combinations with other cyclodextrins, as useful components of plant cell and tissue growth media. The invention also comprises a new method of isolation of useful hydrophobic compounds, such as taxol, produced by plant cultures from the cyclodextrin-containing growth media and from the corresponding cell cultures.

The invention discloses a gel polymer electrolyte with a semi-interpenetrating network structure and a preparation method thereof. The gel polymer electrolyte consists of polyethylene oxide, copolymer, a cross liner and liquid electrolyte, wherein the mass ratio of the copolymer to the polyethylene oxide is 0.25-4 to 1, the mass ratio of the cross linker to the copolymer is 0.4-1 to 5, and the electrolyte is lithium hexafluorophosphate carbonic ester electrolyte with the concentration of 1 mol / L. The preparation method comprises the following steps of: mixing the copolymer (acrylonitrile-glycidyl methacrylate) and the polyethylene oxide, adding the cross linker, namely diethylenetriamine, then preparing and obtaining a polymer film substrate, soaking the substrate in the electrolyte, and finally preparing the gel polymer electrolyte film. The gel polymer electrolyte film prepared by the method is characterized by high ionic conductance, excellent mechanical property of the system and the like, and has bright application prospect in polymer lithium ion batteries.

The invention discloses a preparation method of fresh kiwi fruit slices. The preparation method comprises the following steps: taking fresh high-quality kiwi fruits of which the hardness is between 9.0 kg / cm<2> and 11.0 kg / cm<2> as standard raw materials, putting slices into distilled water after washing, peeling and cutting the kiwi fruits, pumping ozone until the concentration is 0.8 to 1.0 mg / L, and carrying out ultrasonic assisted sterilization for 5 to 8 minutes; then, adding the slices into a kiwi fruit mixed color protecting solution which is prepared from 0.2 percent of ZnCl2, 0.25 percent of EDTA (Ethylene Diamine Tetraacetic Acid)-2Na, 0.10 percent of ascorbic acid and 0.1 percent of citric acid for carrying out color protection, and infiltrating by using 0.5 to 2.0 percent of PEG (Polyethylene Glycol)-chitosan edible coating film after dewatering; finally, packaging by using a PP (Propene Polymer) pallet and a PE (Poly Ethylene) film, and storing at low temperature. The fresh kiwi fruit slices prepared through the preparation method have the characteristics that the appearance color is well kept, browning is not easy to cause, the bacteria inhibiting and fresh keeping effects are good, the storage period is long, and the quality is stable.

The invention discloses a method for carrying out one-side copper plating on a wide stainless steel band and an electroplating bath. The method comprises the following steps: carrying out oil removal and activation on the pre-plating surface of the stainless steel band of a substrate; carrying out nickel pre-plating and general nickel plating on the activated pre-plating surface of the stainless steel band of the substrate, and carrying out copper plating in an alkaline cyanide-free plating solution; passivating and drying the copper-plated stainless steel band. The improved electroplating bath is adopted in the copper plating process, at least two transmission rotary rollers are hermetically mounted on two groove walls at a transmission inlet and a transmission outlet of the electroplating bath respectively, and the electroplating bath can be used for guaranteeing the liquid level of the bath and preventing a plated layer of the stainless steel band from being scratched and is especially suitable for continuous one-side copper plating of the wide band-shaped stainless steel band. The method is safe, environment-friendly, low in cost and capable of carrying out high-speed one-side copper plating on the wide stainless steel band; the one-side plated layer of the stainless steel band, prepared by the method, is uniform, bright and compact in surface, good in corrosion resistance, high in electric conductivity and excellent in stamping resistance, meets the requirements of electronics and military industry, and can be industrially produced.

The invention discloses a graphene preparation method comprising the following steps: a, graphite intercalation compound powder is added into a composite inflation fluid, and an inflation reaction is carried out under a temperature of 0-100 DEG C, such that inflated wormlike graphene aggregate suspension liquid is obtained; b, the wormlike graphene aggregate suspension liquid is subjected to a filtration treatment; c, the wormlike graphene aggregate is sequentially washed with a metal ion complexing agent and water, such that a wormlike graphene aggregate wet material with a pH value of 6-8 is obtained; d, the washed wormlike graphene aggregate wet material is added into water; an ultrasonic wave vibration treatment is carried out for 0.5-20h, such that stripping is realized and graphene is dispersed in water; and a graphene solution is obtained; and e, the water in the graphene solution is removed, such that graphene powder is obtained. With the method provided by the invention, hundreds of kilograms of a high-quality graphene product can be produced in one batch.

The invention provides a benzimidazole quinoline derivative, a preparation method and application in copper ion detection, and particularly relates to a 2-(4-N,N-bis-substituted styryl)-8-1H-benzimidazole) quinoline derivative. Particularly, 2-aminobenzoic acid is used for preparing 2-methylquinoline-8-carboxylic acid, then the 2-methylquinoline-8-carboxylic acid and o-phenylenediamine are subjected to condensation to obtain 2-methyl-8-(2-benzimidazolyl) quinoline, the 2-methyl-8-(2-benzimidazolyl) quinoline and N,N-bis-substituted benzaldehyde are subjected to condensation to obtain the benzimidazole quinoline derivative. A probe has the good complexation with copper ions, when the copper ions exist, derivation of the solution is observed with naked eyes, and the solution is changed from yellow to purple, absorption at the 418 nm position on an ultraviolet visible absorption spectrum is weakened, and a novel absorption peak appears at the 550 nm and gradually increases when the concentration of the copper ions is increased; the benzimidazole quinoline derivative can be used for real-time and rapid measurement of complex samples and can also be used for semiquantitative detection of micro / trace Cu2+ of environment samples from different sources.

The invention discloses a low-phosphorous environment-friendly composite scale and corrosion inhibitor. The scale and corrosion inhibitor is characterized by comprising component A and component B, wherein component A includes sodium hydroxide, benzotriazol, polyepoxysuccinic acid, sodium molybdate and deionized water, and the component B includes zinc chloride, 2-phosphonobutane-1,2,4-tricarboxylic acid, acrylic acid / 2-methyl-2-acrylamido-propanesulfonic acid, hydrolytic polymaleic anhydride and deionized water. The scale and corrosion inhibitor provided by the invention is applicable to a recirculating cooling water system with high hardness and high alkalinity, especially has powerful complexation performance on carbonate scale, includes low-content phosphorous, poses no pollution to the environment and accords with requirements of environmental protection. The scale and corrosion inhibitor is applicable to carbon steel and stainless steel recirculating cooling water systems with a pH value in a range of 7.5 to 9.3 and does not need addition of an acid for adjustment of the pH value. As water quality of industries differs, the scale and corrosion inhibitor has a corrosion inhibition effect in a recirculating cooling water system with a small concentration multiple and good scale inhibition performance in a recirculating cooling water system with a great concentration multiple of 3 to 4 times.

The invention provides a high-performance two-component epoxy primer for rail transit and a preparation process thereof, belonging to the technical field of paints. The high-performance two-componentepoxy primer comprises a component A and a component B in a weight ratio of 10: (2.3-2.8). The component A is prepared from the following components: solid epoxy resin, liquid epoxy resin, graphene, epoxy silane coupling agent modified nanometer silicon dioxide, pigment and filler, zinc-calcium modified aluminum triphosphate, zinc phosphomolybdate, a thixotropic agent, a wetting dispersant, a leveling agent, an antifoaming agent and a mixed solvent. The component B is prepared from cashew nut shell oil modified phenolic aldehyde amine resin, cardanol modified polyamide resin, xylene, n-butyl alcohol, propylene glycol methyl ether acetate and an amino silane coupling agent. The epoxy primer prepared by the invention has excellent mechanical properties, corrosion resistance, weather resistance and adhesive force, and has good application prospects in rail transit.

The invention provides an amphiphilic block T-shaped copolymer and a preparation method thereof, belonging to the field of petroleum exploitation technology. The amphiphilic block T-shaped copolymer comprises at least one block (A) taking acrylamide as a monomeric unit, at least one block (B)at least one block (A) taking alkylphenol polyoxyethylene ether as a monomeric unit, and at least one block (C) taking 2-acrylamide-2-methylpropanesulfonic acid as a monomeric unit. When being adopted as an oil displacement agent, the amphiphilic block T-shaped copolymer is less influenced by outside metal ions, and has excellent salt resistance, a T-shaped structure can form a reversible supermolecule aggregation network structure with intermolecule association, so that the temperature resistance and salt resistance properties of the polymer can be effectively enhanced.

The invention discloses a composite scale and corrosion inhibitor. The inhibitor is characterized by comprising the following main ingredients: 2-phosphono-1,2,4-tricarboxylic acid, hydroxyethylidene-1,1-diphosphonic acid, an acrylic copolymer, benzotriazole, zinc chloride, polyepoxysuccinic acid and deionized water. The inhibitor disclosed by the invention has the following beneficial effects that 2-phosphono-1,2,4-tricarboxylic acid, the hydroxyethylidene-1,1-diphosphonic acid, the acrylic copolymer, benzotriazole, zinc chloride and the polyepoxysuccinic acid of the inhibitor all have good scale and corrosion resistance; and after the above ingredients are compounded according to the weight parts in the formulation of the inhibitor disclosed by the invention, the scale and corrosion resistance effect of the inhibitor is obviously enhanced. The inhibitor disclosed by the invention is suitable for high hardness and high base, and has extremely strong complexing function on carbonate scale. The composite sale and corrosion inhibitor is good in scale and corrosion resistance, low in phosphorus content, and therefore is capable of meeting environment protection requirements. The inhibitor disclosed by the invention not only is suitable for circulating cooling water in a natural gas purification treatment plant, but also is suitable for circuiting cooling water systems in other industries of chemical fertilizer, power, textile and the like, as well as is wide in application range; and acid does not need to be added for regulating PH (Potential of Hydrogen) value.

The invention provides a technology for directly producing an organic chelating compound fertilizer through pelleting by an ammonia-acid method. The technology comprises the steps that (1), a solid keratin substance is subjected to acidolysis by hydrochloric acid and dilute sulfuric acid; ammonia is supplied for neutralization; filtration is conducted; and a compound amino acid solution is obtained; (2), peat and cleaned crop straw are mixed and smashed; compound bacterium liquid and ammonia water are added for fermentation; a potassium hydroxide solution is added after the fermentation; and active humus is obtained; (3), an antioxidant and inorganic salt with medium trace elements are mixed with the compound amino acid solution and the active humus and stirred to form chelation reaction liquid; (4), the chelation reaction liquid is transferred to a buffer slot, and subjected to heat preservation; then a chelation product is obtained; (5), a nitrogen fertilizer, a phosphate fertilizer and a potash fertilizer are mixed with kaolin uniformly, and then fed into an ammonia-acid pelletizer; (6), ammonia and dilute sulfuric acid are supplied to an inorganic fertilizer material layer; the chelation product is sprayed; then mixing and pelleting are conducted; and (7), the organic chelating compound fertilizer is obtained after the pelleting. The organic chelating compound fertilizer prepared by the technology is small in application amount, high in stability and high in plant absorptivity.

The electrolyte composition is used in a method of depositing metals, in particular, onto substrates, especially solar cells. The electrolyte composition is particularly suitable for the deposition of metals, in particular silver, onto solar cells. The electrolyte composition is preferably free of cyanides and contains at least one metal, preferably silver, and an iminodisuccinate derivative, preferably a sodium or postassium iminodisuccinate.

The invention discloses a restoration agent and a preparation method thereof and a method using the restoration agent to restore heavy metal-polluted soil, and belongs to the technical field of restoration of heavy metal soil pollution. The restoration agent is prepared from the following raw materials of biochar, sepiolite, monocalcium phosphate, sugarcane residues, lime powder, longan peel, tartaric acid, hydroxyethyl triphosphate, potassium lignosulphonate, malic acid, chitosan and soybean straw. The restoration agent is prepared by the following steps of powder preparing, fermenting, powder drying and the like. The restoration agent has the advantages that the preparation technology is simple; when the restoration agent is used for restoring the heavy metal-polluted soil, the removal rate of mercury, cadmium, lead, arsenic and pyrene is increased.

The invention discloses a composite filtering material and applications thereof. The composite filtering material comprises an ahead dust layer and a base material, wherein the ahead dust layer is formed by directly piling up polyphenylene sulfide fiber into nets; and the base material comprises a fabric reinforced layer in the middle and heat-resistant short fiber nets laminated up and down. The composite filtering material has the characteristics of being high in collection efficiency, low in pressure loss, and long in service life and filtering atmospheric microparticles (PM2.5) in a city by 100%.

The invention discloses a bio-organic fertilizer for promoting the growth of a tea plant. The bio-organic fertilizer is prepared from the following raw materials in percentage by weight: 51-60 percent of livestock manure, 15-20 percent of vinasse powder, 0.3-0.5 percent of zymophyte, 8-10 percent of a calcium magnesium phosphate fertilizer, 6-10 percent of an oil cake, 0.3-0.7 percent of urea and 5-8 percent of chitosan. The invention also discloses a method for preparing the bio-organic fertilizer, and the method comprises the following steps: (1) uniformly mixing the livestock manure with the vinasse powder to form a mixed material; (2) adding the zymophyte into the mixed material for fermentation; repeatedly rolling over compost; evaporating water during fermentation to reduce the total weight of the hydrated mixed material by 50% to 70%; (3) adding the oil cake; stirring uniformly; stacking and fermenting for 10 to 20 days; adding the calcium magnesium phosphate fertilizer, the urea and the chitosan; stirring uniformly; stacking and ageing for 3 to 5 days; crushing to obtain the bio-organic fertilizer. The bio-organic fertilizer disclosed by the invention can effectively utilize various organisms and pure natural trace elements in the livestock manure. Under the effect of biological colony, physical and chemical properties of soil can be improved to promote the growth of tea, improve the tea quality and increase the tea yield.

The invention discloses a carbonate inhibitor and a preparation method and application thereof. The inhibitor is an organic high-molecular compound containing a large amount of polar groups of carboxyl, hydroxyl, methoxyl, carbonyl, amino and the like. The preparation method includes: mixing grass coal, water and sodium carbonate, oscillating, extracting, filtering and removing dregs, and the obtained filtrate is the carbonate inhibitor. The method is simple in process and free of pollution. By means of the carbonate inhibitor for separation of phosphorite and carbonate minerals, content of MgO in phosphate concentrate and chemical oxygen demand (COD) in tailings can be effectively reduced, use amount of a regulator Na2CO3 in a phosphorite direct flotation process can be reduced, and economical benefit and environment benefit are obtained.

The invention belongs to the technical field of concrete admixtures, and particularly relates to an alkali-free fluorine-free liquid accelerator and a preparation method thereof. The accelerator is an alkali-free fluoride-free environment-friendly liquid accelerator which is formed by adding modified silicon dioxide, a defoaming agent and a dispersing agent into mother liquor of four components including polyaluminum sulfate, magnesium sulfate, diethanol amine and ethylene glycol in a matched manner, and preferably, the accelerator comprises 53-57% of polyaluminum sulfate and 4-6% of diethanol amine. 2-3% of magnesium sulfate; 1-2% of ethylene glycol; 2-4% of modified silicon dioxide, 0.2-1.5% of a defoaming agent and 2-6% of a dispersing agent; the total percentage is 100%. The accelerator is green, environment-friendly, pollution-free, simple to prepare, high in concrete early strength, small in later strength loss, good in stability and adaptability, economical, environment-friendly and the like.

The invention discloses a composite complexing agent and a method of preparing a lithium-ion power battery cathode precursor material, and belongs to the technical field of lithium-ion cathode materials. The two green organic salts, citrates and glutamates (or glycinates), are combined into the novel composite complexing agent to adjust and control pH value and temperature of a reaction system. Settling reaction level herein is more thorough; the reaction process is milder; settling conversion efficiency is high; the low-cost green production of nickel-rich cathode material precursor (Ni0.6Mn0.2Co0.2)(OH)2 is achieved. The precursor prepared herein has uniform particle morphology; both optimization of the co-precipitating technique and precise control of organic salt complexing agent concentration help greatly reduce the environmental pollution due to reaction wastewater and heavy metal ions, true green production is achieved, and high industrial value is provided.