1080 results about "Ferrous sulphate" patented technology

The invention discloses a carbon-coated sodium ferrous sulfate phosphate positive electrode material as well as a preparation method and application thereof. The carbon-coated sodium ferrous sulfate phosphate positive electrode material is square flaky particles formed by coating sodium ferrous sulfate phosphate with a conductive carbon material and irregular aggregates of the square flaky particles. The molecular formula of the sodium ferrous sulfate phosphate is Na (6-2x + y) Fex( SO4) (3-y) (PO4) y, x is more than 0 and less than 3, and y is more than 0 and less than or equal to 0.5. The invention also discloses a preparation method and application of the carbon-coated sodium ferrous sulfate phosphate positive electrode material. The positive electrode material has the advantages of phosphate and sulfate positive electrode materials, the voltage platform is high, the conductivity is excellent, the air stability is good, and the assembled battery has excellent chemical sodium storage performance, high discharge specific capacity, highly reversible charge-discharge reaction and good cycle performance. The method is simple in process, high in feasibility, low in raw material cost and easy to realize industrial production through a solution system.

The invention discloses a chitosan modified lithium iron phosphate and carbon composite positive electrode material and a preparation method thereof.The preparation method comprises the steps that 1, lithium hydroxide, phosphoric acid and ferrous sulfate heptahydrate are mixed to prepare a uniform and stable solution, and a lithium iron phosphate precursor is prepared through a solvothermal method; step 2, dissolving chitosan in an acetic acid aqueous solution, and magnetically stirring under a water bath condition until the chitosan is completely dissolved to prepare a chitosan solution; and 3, adding the lithium iron phosphate precursor into a chitosan solution, uniformly mixing, carrying out ball milling and freeze drying, and carrying out high-temperature carbonization treatment in an inert gas to obtain the chitosan modified lithium iron phosphate and carbon composite positive electrode material. The method is simple to operate, low in cost and uniform in product particle size distribution.

The invention belongs to the technical field of lithium batteries, and discloses a fluorine-doped lithium iron manganese phosphate positive electrode material and a preparation method thereof.The preparation method comprises the steps that hydrofluoric acid, manganese sulfate monohydrate, ferrous sulfate heptahydrate, lithium hydroxide monohydrate and phosphoric acid serve as raw materials, and a fluorine-doped lithium iron manganese phosphate precursor is prepared through a microwave-hydrothermal synthesis method; and forming a coating layer on the surface of the precursor by using SnO2-doped chitosan gel, and calcining to obtain the fluorine-doped lithium iron manganese phosphate positive electrode material. The positive electrode material comprises fluorine-doped lithium manganese iron phosphate particles and a SnO2 / C coating layer, doping of fluorine promotes diffusion of lithium ions of the positive electrode material, the structure of the material is more stable, SnO2 is doped in chitosan serving as a carbon source, the conductivity of the positive electrode material is improved, and on the basis of the synergistic effect of the fluorine element and metal ions of the coating layer, the conductivity of the positive electrode material is improved. A uniform and tightly combined carbon coating layer is formed on the surface of the material. The fluorine-doped lithium iron manganese phosphate positive electrode material prepared by the preparation method has excellent cycle performance and rate capability.

In one aspect, a preparation method for ferric phosphate includes the following steps: (a) feeding a ferrous sulfate solution and a phosphate solution including hydrogen peroxide simultaneously into a first reactor for mixing and reacting to obtain nucleated ferric phosphate; wherein a molar ratio of iron element to phosphorus element in the feeding process is 1:1, and a stirring speed is 500-600 r / min; (b) discharging the nucleated ferric phosphate to a second reactor for growth to obtain amorphous ferric phosphate slurry, and post-processing the amorphous ferric phosphate slurry to obtain the high tap density ferric phosphate; wherein a stirring speed is 120-150 r / min. The first reactor is a small-volume reactor, and the second reactor is a large-volume reactor.

The invention provides lepidolite flotation wastewater treatment equipment and a flotation process, and relates to the technical field of wastewater treatment, the lepidolite flotation wastewater treatment equipment comprises a reaction tank, a stirring mechanism, a swing dosing mechanism and a spraying mechanism; the stirring mechanism comprises a mounting frame fixedly arranged at the top of the reaction tank, and a rotating shaft is vertically and rotatably connected to the inner side of the mounting frame. According to the scheme, a ferrous sulfate solution is finally added into the reaction tank through the spraying mechanism, then a diluted H2O2 solution is intermittently fed through the swing medicine feeding mechanism, the H2O2 solution generates strong oxidizing hydroxyl free radicals under the catalysis of the ferrous sulfate solution, and therefore hydrophobic chains and polar groups of residual medicine are destroyed, and the medicine is obtained. The lepidolite metallurgical flotation wastewater is degraded into small molecular organic matters or mineralized into CO2 and H2O, so that the phenomenon that the subsequent coagulating sedimentation or adsorption process is hindered by residual chemicals is avoided, the chemical oxygen demand and toxicity of the wastewater are reduced, the subsequent biological treatment on the wastewater is facilitated, and the treatment effect and efficiency of the lepidolite metallurgical flotation wastewater are effectively improved.

The invention discloses a preparation method of a fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate, which comprises the following steps: carrying out heat treatment on fly ash, cooling, adding into a sulfuric acid solution, stirring and mixing, carrying out solid-liquid separation, adding sodium hydroxide into a liquid product to adjust the pH value to 4.5-6 to obtain an aluminum hydroxide precipitate, washing and roasting to obtain aluminum oxide, and drying to obtain the fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate. The preparation method comprises the following steps: mixing fly ash-Al-MOF with a sulfuric acid solution to obtain an aluminum sulfate solution, uniformly mixing the aluminum sulfate solution with a phthalic acid solution, carrying out solid-liquid separation, washing a solid product, carrying out freeze drying to obtain fly ash-Al-MOF, and respectively loading sodium percarbonate and acid-containing ferrous sulfate on the fly ash-Al-MOF to obtain fly ash-Al-MOF loaded with sodium percarbonate and fly ash-Al-MOF loaded with acid-containing ferrous sulfate; and uniformly mixing the two components to obtain a finished product. Compared with the existing method, the material prepared by the invention can realize long-term, stable, effective and environment-friendly remediation of the organic polluted soil, and the remediation efficiency is high.

The invention relates to the technical field of water treatment agent preparation and environmental governance material processing, in particular to polymeric ferric sulfate and a preparation method thereof.The preparation method comprises the steps that steam condensation recycled water of a thermal power plant of an aluminum factory is mixed with ferrous sulfate and concentrated sulfuric acid to form a reaction solution, oxygen is introduced for an oxidative polymerization reaction, and a liquid intermediate is generated; gradient cooling is carried out on the liquid intermediate to control the molar ratio of ferric ions to hydroxyl, and a porous solid precursor is formed through concentration and closed aging; crushing the precursor, performing graded drying by adopting a rotary kiln and flash drying, and synchronously spraying a hydrophobic modifier to reduce the surface hydroxyl activity; the powdery product is secondarily dried in a nitrogen inert environment, and moisture absorption and agglomeration are inhibited. The invention solves the problems of mixed crystal forms, delayed release of effective components and secondary pollution in the traditional process. The obtained product is uniform in crystal form, concentrated in particle size distribution, remarkably improved in dissolution rate and storage stability, and suitable for black and odorous water body treatment and industrial sewage treatment.

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 objective of the present invention is to provide a micron-sized porous sodium ferrous sulfate / carbon composite positive electrode material and a sodium-ion battery or sodium battery produced therefrom. SOLUTION: The composite material of the present invention includes a sodium ferrous sulfate / carbon composite material with and / or without metal doping elements, which is prepared by coprecipitation and solid-state calcination, and the particle size is 2-30 nm, has a porous structure, and is composed of densely packed 80-200 nm primary particles densely covered with amorphous carbon, and the surface of the micron particles is covered with a thin layer of reduced graphene to form a three-dimensional conductive network. The micron-sized particle positive electrode material has a high tap density, which is helpful in increasing the volumetric energy density of the battery, and the material has the advantages of abundant raw material reserves, low cost, high operating voltage, good rate characteristics and cycle stability as the positive electrode of sodium ion batteries or sodium batteries, and the preparation process of the material is simple. The sodium ion batteries or sodium batteries of the present invention have the advantage of high energy density and have the prospect of broad market application.

The invention provides a carbon quantum dot-ferric oxide nano composite material as well as a preparation method and application thereof. The composite material is prepared by the following steps: S1, mixing a ferrous sulfate solution with an imidazole methanol solution, and performing ultrasonic treatment to obtain a zeolite imidazate skeleton structure material containing an iron core; s2, calcining the zeolite imidazate skeleton structure material in an environment with a temperature range of 200-700 DEG C and oxygen partial pressure of 5-40% to obtain iron oxide with a complex frame structure; s3, synthesizing graphene carbon quantum dots with the size of 5-8 nm by adopting a trinitrophenol method; s4, the carbon quantum dots and ferric oxide powder are mixed and then evenly ground in a ball mill, the ball milling time is 60-240 min, the content of the added graphene carbon quantum dots is 0.5-3 wt%, and a carbon quantum dot-ferric oxide nanocomposite is obtained; according to the method, ferric oxide with a complex framework is compounded with the graphene carbon quantum dots, so that indoor VOCs can be oxidized at room temperature.

The invention provides a dump leaching method for improving the leaching rate of gold ore, and belongs to the technical field of mineral processing. The method comprises the following steps: firstly, separating minerals into oversize products and undersize products; mixing sodium carboxymethyl cellulose, bentonite and ferrous sulfate to obtain a mixture, and granulating the undersize product by using the mixture as a binder; and mixing the undersize product particles with the oversize product, and carrying out cyanide-free dump leaching. According to the method, through graded granulation and heap building, the problem that heap building permeability is poor due to the fact that the gold ore contains many clay minerals is solved. In the granulation stage, ferrous hydroxide colloid generated by hydrolysis of ferrous sulfate in the binder can assist ore particle agglomeration, and particle stability is enhanced; during subsequent cyanide-free dump leaching, ferrous sulfate can be used as an auxiliary reducing agent and a catalyst in a thiourea gold leaching system to promote oxidation and dissolution of gold; meanwhile, ferrous ions can adjust the oxidation-reduction potential of a system, so that the thiourea gold leaching reaction is in a more favorable potential interval, the oxidation efficiency of thiourea is improved, invalid decomposition of thiourea is reduced, and therefore the use amount of thiourea and the use amount of agents are reduced.

The invention belongs to the field of solid waste recycling, and relates to a hematite modified rice hull-based biochar material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out ultrasonic treatment on rice husks in an ethanol solution, then soaking the treated rice husks in a mixed solution of methanol and formalin for activation, carrying out vacuum filtration and drying, and carrying out anaerobic calcination under the protection of a nitrogen atmosphere to obtain rice husk-based biochar; the method comprises the following steps: soaking rice husk-based biochar in an acid solution, and carrying out microwave digestion on the acid-modified rice husk-based biochar to obtain chemically-modified rice husk-based biochar; adding into a solution containing ferrous sulfate, fully stirring, and then carrying out hydrothermal treatment to obtain the hematite modified rice hull based biochar material. The method can significantly improve the conversion rate of organic matters in the sludge, increase the accumulated yield of biogas, effectively reduce the biotoxicity of heavy metals in the sludge, facilitate the resource utilization of the sludge, and have important significance for solving the environmental risk problem of the sludge.

The invention belongs to the field of lithium ion battery material preparation, and provides a preparation method of low-impurity battery grade iron phosphate, which comprises the following steps: dissolving titanium dioxide ferrous sulfate in water to obtain a solution A, adjusting the pH value of the solution A to 3.0-4.0, reacting, and carrying out solid-liquid separation to obtain a clear liquid; adjusting the pH value of the clear liquid, and then mixing the clear liquid with sodium nitrite to obtain a solution B; adding the solution B into a reaction kettle, introducing compressed oxygen until the pressure in the kettle body is 5-15 bar, reacting until the pressure in the kettle body is reduced to a constant value, and carrying out solid-liquid separation to obtain a purified iron source solution; preparing iron phosphate dihydrate by taking the purified iron source solution and a phosphorus source as raw materials through a precipitation method; and calcining the iron phosphate dihydrate to obtain the low-impurity battery-grade iron phosphate. The preparation method is simple and feasible in process, low in cost, wide in source of required raw materials, good in safety, low in cost, easy to realize large-scale production, good in impurity removal effect and low in iron loss, and the Mn content of the battery-grade iron phosphate prepared from the impurity-removed ferrous sulfate can be as low as 10 ppm or below.

The invention relates to the technical field of water treatment, and discloses a sewage mixing flocculation sedimentation tank with a dosing system and a sewage treatment process, the sewage treatment process comprises the following steps: (1) sewage enters a pretreatment unit, and large-particle suspended solids are removed; (2) enabling the sewage to flow into a pH regulating tank, adding a pH regulator through a dosing system, and regulating the pH value to 9-11; (3) passing through a coagulation reaction tank, adding ferrous sulfate to reduce hexavalent chromium into trivalent chromium, and promoting a flocculation reaction; and (4) further adding polyaluminum chloride through the flocculation reaction tank to form floc. Through a multi-unit combined treatment process, suspended solids and various heavy metals in the sewage are gradually removed, and the effluent quality is ensured to reach the standard. Compact and reasonable process layout is adopted, the occupied area is reduced, and the device is suitable for small and medium-sized sewage treatment plants. An automatic dosing control system is introduced, dosing is accurate, and the operation cost is reduced.

The invention discloses a fermentation medium for regulating and controlling a clostridium aerovorans target product and a fermentation method of the clostridium aerovorans target product. The medium comprises a basic component and a regulating component, the basic components comprise ammonium chloride, potassium chloride, magnesium sulfate heptahydrate, sodium chloride, monopotassium phosphate, yeast powder, calcium chloride dihydrate, sodium selenite, nickel chloride hexahydrate, biotin, folic acid, pyridoxine hydrochloride, thiamine, riboflavin, nicotinic acid, D-calcium pantothenate, cobalamin, para aminobenzoic acid and lipoic acid; the adjusting component comprises sodium tungstate, ferrous sulfate and sodium molybdate, sodium tungstate and ferrous sulfate have a forward adjusting effect on increasing the yield of acetic acid, ethanol and butanol in the target product, and sodium molybdate has a reverse adjusting effect on the target product. By optimizing the proportion of trace elements in the culture medium, the clostridium metabolism efficiency is improved, synthesis of a target product is regulated and controlled, and the method is particularly suitable for industrial production of acetic acid, ethanol, butanol and the like.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and provides a high-specific-energy lithium manganese iron phosphate positive electrode material and a preparation method thereof.The preparation method comprises the following steps that 1, carbon nanotubes are added into deionized water to be subjected to ultrasonic dispersion, modified xanthan gum, ammonia water and hydrazine hydrate are added to be stirred, the mixture is heated to continue to be stirred, suction filtration and washing are conducted, and carbon nanotubes are obtained; drying to obtain a carbon source; step 2, adding the lithium hydroxide solution into the phosphoric acid solution, stirring and dispersing, adjusting the pH value, adding the manganese sulfate solution and the ferrous sulfate solution, and carrying out hydrothermal synthesis reaction to obtain a hydrothermal reaction product; step 3, centrifuging, washing and drying the hydrothermal reaction product, and mixing the dried product with a carbon source to obtain a mixture; step 4, carrying out ball milling on the mixture to obtain powder; and step 5, calcining the powder, and cooling to obtain the product. The obtained lithium manganese iron phosphate positive electrode material has the advantages of uniform thickness of a carbon coating layer, excellent electrochemical performance, stable cycle performance and the like.

The invention relates to a fluorine-containing binder for a sulfide all-solid-state battery and a preparation method and application thereof.The binder is formed by copolymerizing isoprene and lithium perfluorovinyl ether sulfonate, specifically, the lithium perfluorovinyl ether sulfonate, a chelating agent, an emulsifying agent, ferrous sulfate, a reducing agent and an acid-base buffering agent are dissolved in water, cooling is conducted in the inert atmosphere, and the fluorine-containing binder for the sulfide all-solid-state battery is obtained. And adding isoprene, an initiator and a molecular weight regulator, and carrying out polymerization reaction to obtain the fluorine-containing binder. The isoprene can enhance the solubility of the lithium perfluorovinyl ether sulfonate fragment in the non-polar solvent, so that the whole polymer is dissolved in the non-polar solvent; the perfluorovinyl ether lithium sulfonate has a large space proportion of fluorocarbon groups, and has a shielding effect on hydrocarbon groups on isoprene, so that the stability of the whole polymer can be improved. The fluorine-containing binder prepared by the preparation method disclosed by the invention is a binder with high elasticity, high ionic conductivity and high stability.

The invention relates to a special fertilizer suitable for saline-alkali soil and a preparation method thereof. The fertilizer is granular and has a multi-layer structure which is sequentially arranged from inside to outside: a nutrition core layer, a controlled release film layer, a soil improvement fast exchange layer and a microorganism attaching layer. The nutrition core layer contains nitrogen, phosphorus, potassium and medium trace elements, and meets the basic nutrient requirements of crops; the controlled release film layer is self-assembled layer by layer by adopting alginate / chitosan, a humic acid-ferrous complex and a breakable cross-linking point are inserted into the film, and starch is sprayed on the outer layer, so that an ionic strength / alkalinity dual-response controlled release system is formed; the soil improvement quick exchange layer contains microcrystalline gypsum and ferrous sulfate; the microbial epiphytic layer fixes salt-tolerant phosphate solubilizing bacteria, potassium bacteria and exopolysaccharide-producing bacillus by using a charcoal-zeolite carrier, and the bacteria are distributed on the surfaces of the particles in a dotted manner. The fertilizer realizes organic combination of soil improvement, fertilizer supply and microbial regulation and control, can significantly reduce the soil salinity and alkalinity in a saline-alkali soil environment, and improves the fertilizer utilization rate and the crop growth performance.

The invention belongs to the technical field of synthetic purifying agents, and discloses a multipurpose synthetic purifying agent and a use method thereof, and the purifying agent comprises the following components in percentage by weight: 18-50% of ferric trichloride; 2-37% of polyaluminum ferric chloride; 10 to 60 percent of calcium chloride dihydrate; 22 to 52 percent of ferrous sulfate; 5-45% of polyaluminum chloride; 10-30% of basic aluminum chloride; according to the invention, COD in wastewater can be rapidly removed, the pH value is neutralized, the hydrophilicity is changed, a diffusion layer is compressed, the counter-ion effect is increased, and the purpose of oxidation reduction is finally achieved; in the hydrolysis process, a surfactant and various pollution factors in wastewater can be effectively adsorbed and polymerized into jelly, and the jelly is rapidly precipitated and separated in a short time, so that the wastewater is purified.

The invention relates to the field of organic fertilizer manufacturing, in particular to a preparation method of a humic acid-containing water-soluble organic fertilizer with chelated medium trace elements for synergism, and the preparation method comprises the following steps: S1, adding modified humic acid into deionized water, heating to 40-50 DEG C, stirring for 25-35 minutes, adding hydrated ferrous sulfate, introducing compressed air, and stirring for reaction for 30-50 minutes to obtain a chelating solution and the like; according to the invention, the environmental adaptability of humic acid is improved through molecular structure modification, a composite chelation system is constructed to enhance element stability, a multistage chelation sequence is optimized to prevent ion antagonism, and a physical barrier is innovated to realize a core process path of intelligent controlled release. The functional limitation of a traditional fertilizer in a complex agricultural ecological system is effectively broken through, the nutrient utilization efficiency and agricultural sustainability are remarkably improved, and the fertilizer has wide application prospects in soil remediation, precision agriculture and resource-saving planting systems.

The invention discloses a gradient chelation-free radical activation synergistic eucalyptus chemithermomechanical pulp wastewater composite coagulant and a preparation method thereof, and belongs to the technical field of eucalyptus chemithermomechanical pulp wastewater treatment. Ferrous sulfate heptahydrate, aluminum hydroxide and magnesium sulfate are used as raw materials, and the water purifying agent with the viscosity of 35-45 mPa.s is prepared through gradient chelation reaction, free radical activating treatment, functional component composite reaction, pH and specific gravity regulation and control and curing treatment. By utilizing the synergistic effect of the polydimethyldiallylammonium chloride and the formaldehyde dicyandiamide resin, the electric neutralization capability on macromolecular colloidal substances in the wastewater is remarkably enhanced, and macromolecular substances which are difficult to biodegrade in the water are effectively removed; when the compound coagulant is used for treating the eucalyptus chemithermomechanical pulp wastewater, the addition amount of the compound coagulant is small, and the compound coagulant has excellent COD (Chemical Oxygen Demand) reduction and decolorization effects.

The invention provides a method for producing carboxyl magnetic beads based on industrial solid waste, and relates to the technical field of carboxyl magnetic bead preparation, and the method comprises the following steps: preparing a saturated solution from ferrous sulfate solid waste; removing heavy metal impurities in the saturated solution by using a mixed extraction agent through an extraction method to obtain a ferrous ion crude product; synthesizing the ferrous ion crude product through a hydrothermal method to obtain ferroferric oxide particles; carrying out hydroxyl coating treatment on the ferroferric oxide particles to obtain hydroxyl coated particles; and carrying out carboxyl coating treatment on the hydroxyl coated particles to obtain the carboxyl magnetic bead material. Ferroferric oxide is produced by taking ferrous sulfate solid waste as a raw material through a hydrothermal method, then separation is carried out through a magnetic field, the separated ferroferric oxide is modified with a silicon hydroxyl coupling agent, the required iron oxyhydroxide magnetic beads are directly obtained, waste resources are utilized in an environment-friendly mode, the production cost is reduced, and the method is suitable for industrial production. And the great potential of improving the product quality and functionality is achieved.

The invention discloses a lithium iron manganese phosphate precursor and a preparation method and application thereof, and belongs to the technical field of lithium iron manganese phosphate precursors, and the preparation method comprises the following steps: S1, mixing a lithium hydroxide solution, a phosphoric acid solution, a manganese sulfate solution and a ferrous sulfate solution to obtain a first solution; s2, carrying out a hydrothermal reaction on the first solution, adding an MOF mixture to obtain a second solution, and carrying out a secondary hydrothermal reaction on the second solution to obtain a lithium manganese iron phosphate precursor; the MOF mixture comprises an iron-based MOF, a zinc-based MOF and sodium poly (p-styrenesulfonate). According to the preparation method, the micron-sized lithium manganese iron phosphate precursor with relatively high tap density is prepared through the hydrothermal reaction.

The invention provides high-performance silver powder suitable for TOPCon battery fine grid silver paste, a preparation method of the high-performance silver powder and the silver paste, and belongs to the technical field of photovoltaic materials. The preparation method comprises the steps that a silver salt solution and a composite reducing agent are mixed, a first-stage hydrothermal reaction is carried out at the first temperature, a second-stage hydrothermal reaction is carried out at the second temperature, and silver powder is obtained after centrifugation, washing and drying; wherein the composite reducing agent is selected from a mixture of two of potassium tartrate, sodium sulfite and ferrous sulfate. According to the method, gradual growth and crystallinity improvement of silver crystal nucleuses are achieved through two-stage heating, particle aggregation or uneven morphology caused by rapid reduction is avoided, in addition, the adopted composite reducing agent combination is remarkably superior to a single reducing agent (such as ascorbic acid), and the morphology and particle size distribution of the silver powder can be more accurately regulated and controlled.

The invention belongs to the technical field of coal combustion, and particularly relates to an environment-friendly rare earth catalyst as well as a preparation method and application thereof in promoting coal combustion. The catalyst is prepared from composite rare earth oxide, calcium oxide, potassium carbonate, ferrous sulfate, kaolin, diatomite and a multi-component composite assistant component in a specific proportion through the steps of slurry ultrasonic activation, rare earth coating, assistant step-by-step doping, microwave drying, protective atmosphere roasting and the like. The catalyst is unique in structure and good in dispersity, the coal combustion efficiency can be remarkably improved, the burnout temperature and the carbon content of fly ash are reduced, emission of flue gas pollutants such as CO, NOx and SO2 is effectively reduced, and the catalyst is suitable for the fields of energy conservation, carbon reduction and environment-friendly treatment of coal-fired power plants and industrial boilers.

The invention provides a leaching method and a recycling method of metal in a nickel cobalt lithium manganate positive plate. The leaching method comprises the following steps: pre-treating a nickel cobalt lithium manganate positive plate disassembled from a waste battery to obtain positive powder; preparing a gluconic acid leaching agent containing gluconobacter oxydans, and electrolyzing the positive electrode powder at the voltage of 2.0-2.5 V by adopting a double-chamber electrochemical electrolytic tank to obtain a leaching solution containing Li < + >, Ni < 2 + >, Co < 2 + > and Mn < 2 + >. Positive electrode powder, a gluconic acid leaching agent and a ferrous sulfate aqueous solution are put into a cathode chamber of a double-chamber electrochemical electrolytic tank, and an inorganic alkali aqueous solution is contained in an anode chamber of the double-chamber electrochemical electrolytic tank; the leaching efficiency can be improved and the leaching rate is high through the effects of dissolution of gluconic acid, electrolysis for hydrogen release and auxiliary reduction of Fe < 2 + >.

The invention relates to the field of stripping hanger liquid processing, in particular to environment-friendly stripping hanger liquid and a preparation process thereof. The cleaning agent is prepared from the following raw materials in percentage by weight: 10-15% of sulfuric acid, 3-6% of tetrasodium hydroxyethylidene diphosphate, 4-6% of sodium alcohol ether sulphate, 4-8% of N-methyl-2-pyrrolidone, 4-9% of cyclohexanol, 1-2% of phenolsulfonic acid, 4-7% of sodium hypochlorite, 5-9% of hydrogen peroxide, 3-4% of ferrous sulfate, 1-3% of sodium chloride, 4-8% of a wetting agent, 0.5-0.8% of a stabilizer, 2-3% of a thickening agent, 2-3% of a penetrant and the balance of pure water. Mild chemical components adopted in the formula replace strong nitric acid and strong alkali components in a traditional hanger stripping solution, the corrosivity of the hanger stripping solution is reduced, all the raw materials meet the environment-friendly requirement, and harmful substances cannot be generated in the production and use process, and the environment cannot be polluted.

The invention relates to the technical field of demulsifiers, and particularly discloses a demulsifier for treating waste emulsion and a demulsification process of the demulsifier. The invention discloses a demulsifying agent for treating waste emulsion. The demulsifying agent is prepared from the following raw material components in parts by weight: 1 to 1.2 parts of calcium chloride, 1 to 1.1 parts of polyaluminum chloride, 0.7 to 0.85 part of anionic polyacrylamide, 0.3 to 0.5 part of ferrous sulfate, 1 to 1.2 parts of a surfactant, 0.4 to 0.5 part of an auxiliary demulsifying agent, 0.1 to 0.2 part of a synergist and 0.1 to 0.2 part of a stabilizer. The demulsifier disclosed by the invention has a relatively good demulsification effect, so that the treatment effect on the waste emulsion is improved.

The invention relates to the field of insulating materials, in particular to a preparation method of a ceramic insulator, which comprises the following steps: ball-milling cryolite, kaolin, quartzite, thiourea intercalation layered bimetallic oxide, glass powder, sodium tungstate, ferrous sulfate and deionized water, uniformly mixing, adding a binder, uniformly stirring to obtain glaze, applying the glaze to a ceramic matrix to obtain a rough blank, and sintering to obtain the ceramic insulator. And drying the rough blank, putting the rough blank into a muffle furnace, heating to 1100-1200 DEG C, and sintering for 1-5h. The ceramic insulator prepared by the invention has excellent photocatalytic self-cleaning performance and anti-pollution flashover performance, can ensure safe and stable operation of a power transmission line, and reduces the maintenance cost of line operation.

The invention discloses a precipitation-supported coated slow-release carbon-based iron fertilizer and a preparation method thereof.The preparation method specifically comprises the steps that a biological crustacean heavy metal adsorbent is soaked in a ferrous sulfate solution and then soaked in a calcium hydroxide solution again after low-temperature drying, finally, dried particles are granulated and subjected to coating treatment, and the coated slow-release carbon-based iron fertilizer is obtained. The coated slow-release iron fertilizer is loaded in a precipitation mode, a mixture of precipitated ferric hydroxide and ferrous hydroxide is uniformly dispersed and attached to the interiors of pore channels of the porous adsorbent, and the precipitated ferric hydroxide and the ferrous hydroxide are wrapped by a byproduct calcium sulfate in the porous adsorbent, so that long-acting slow release of iron ions can be realized; the rice cadmium arsenic antagonistic iron fertilizer has the advantages that the rice cadmium arsenic antagonistic effect can be achieved, the oxygen content of soil can be reduced, fine quantitative use of the coated iron fertilizer in the seedling raising period is matched, iron ion antagonism and a precipitation type adsorption load mode are carried out in the whole rice growth process, the iron ion release period is greatly prolonged, and the iron fertilizer has the excellent rice cadmium arsenic antagonism effect and has the excellent application prospect.