1430 results about "Filter cake" patented technology

The invention discloses a method for reducing the content of aged starch and soluble miscellaneous sugar in alpha-cyclodextrin, and belongs to the technical field of alpha-cyclodextrin synthesis, the method comprises the following steps: liquefaction, conversion, primary filtration, inclusion, secondary filtration, complexing agent removal and post-treatment; the conversion comprises the following steps: adding alpha-CGTase and isoamylase into the starch liquefied liquid at 38-42 DEG C, adjusting the pH value to 5.30-5.70, and carrying out conversion to obtain a conversion liquid; the primary filtration comprises the following steps: carrying out enzyme deactivation treatment on the conversion liquid, filtering, washing a filter cake with water, and combining the washing liquid with the filtrate to obtain primary filtrate; and the secondary filtration comprises the following steps: filtering the material liquid containing the complex, taking a filter cake, and washing the filter cake with water to obtain the inclusion compound. The preparation method of the alpha-cyclodextrin is improved, so that the alpha-cyclodextrin with high yield and high stability is obtained, and the industrial controllability is realized.

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using titanium gypsum and a waste hydrogenation catalyst, which comprises the following steps: crushing and pickling the waste hydrogenation catalyst, washing with clear water until the waste hydrogenation catalyst is neutral, and drying to obtain pretreated waste catalytic powder; uniformly mixing and stirring titanium gypsum and the pretreated waste catalytic powder to obtain gypsum doped pretreated waste catalytic powder; mixing a plant extract, crop powder and gypsum, doping the pretreated waste catalytic powder, uniformly stirring, feeding into mixed bacteria consisting of bacillus and aspergillus, and fermenting under a stirring condition to obtain a biological activated mixture; adding water into the biological activation mixture for hydrothermal reaction, filtering, separating and washing the material after the hydrothermal reaction is finished, roasting the washed filter cake, naturally cooling the roasted material, and crushing to obtain the carbon monoxide oxidation catalyst. According to the invention, the titanium gypsum and the waste hydrogenation catalyst are combined, and the biomass material is used for activating treatment, so that the use of chemical precursors is reduced, and the oxidation catalyst with excellent catalytic performance is obtained.

Belonging to the field of petrochemical engineering, the invention discloses a catalytic slurry oil purification device, which comprises a tank body, and a feed end and a discharge end respectively arranged at two ends of the tank body. An upper partition plate and a lower partition plate are fixedly connected to the inner wall of the tank body, a discharging opening is formed in the upper partition plate, and a feeding opening is formed in the lower partition plate; the interior of the tank body is divided into three independent cavities by the upper partition plate and the lower partition plate; according to the scheme, the filter element is sleeved with the hollow cylinder, and the rotatable first spiral flow deflector is further arranged between the inner wall of the hollow cylinder and the outer wall of the filter element; a rotatable first spiral flow deflector is further arranged between the inner wall of the hollow cylinder and the outer wall of the filter element; a shear force generated by rotation of the first spiral flow deflector can prevent a filter cake on the surface of the filter element from forming a compact thick layer; a filter cake layer can be controlled within a relatively thin thickness range, and the rising speed of the pressure difference is delayed, so that the operation duration of a single filtering period is prolonged; and the single-time continuous treatment capacity of the device is greatly improved.

The application provides a reverse water gas shift catalyst, a preparation method and application thereof, and the reverse water gas shift catalyst prepared by the preparation method has excellent catalytic activity and high CO selectivity in a reverse water gas shift reaction. The preparation method comprises the following steps: contacting a precipitating salt solution with a precipitant aqueous solution and performing co-precipitation, and simultaneously controlling the reaction temperature to be 40-80 DEG C and the pH to be 6-8; optionally performing aging after the co-precipitation is completed; filtering the obtained precipitate to obtain a filter cake, washing the filter cake, then drying the filter cake, and calcining the filter cake at 300-500 DEG C to obtain the reverse water gas shift catalyst; wherein the precipitating salt solution is a mixed aqueous solution of a soluble salt of divalent metal ions and a soluble salt of trivalent metal ions, the divalent metal ions are selected from divalent ions of Mg and / or Zn, and the trivalent metal ions are selected from trivalent ions of Al, In and / or Ga.

The invention provides a rapid preparation method of tungsten trioxide, which specifically comprises the following steps: step 1, weighing crude tungstic acid, dissolving in ammonia water, heating and stirring to obtain an ammonium tungstate solution; step 2, slowly dropwise adding the ammonium tungstate solution in the step 1 into a poor solvent to obtain an ammonium paratungstate suspension, and step 3, filtering the ammonium paratungstate suspension in the step 2 to obtain an ammonium paratungstate filter cake, and leaching the ammonium paratungstate filter cake with the poor solvent; 4, the ammonium paratungstate filter cake in the step 3 is placed in a drying oven to be dried; and (5) roasting the ammonium paratungstate filter cake in the step (4) at high temperature to obtain a faint yellow irregular flaky tungsten trioxide product. According to the preparation method, a mixed solvent crystallization and high-temperature roasting two-step process is adopted, the solubility of ammonium tungstate in water is reduced by adding a poor solvent, so that an ammonium tungstate solution rapidly reaches a saturated state and is separated out, the crystallization process of ammonium paratungstate is accelerated, and the preparation speed and the crystallization rate of a tungsten trioxide product are high.

The invention discloses a centrifugal machine for sludge dewatering, belongs to the technical field of sludge dewatering, and aims to solve the problems that when the centrifugal machine for sludge dewatering is used, sludge on the inner wall of a rotary drum can be gradually compacted to form a filter cake layer, particles in the filter cake layer easily form a bridging structure at an inlet of a through hole, and the sludge dewatering efficiency is affected. A controller is arranged on the outer wall of the supporting frame, a cylinder is arranged in the supporting frame, one side of the cylinder communicates with a drainage pipe, a first driving assembly is arranged in the cylinder, a dewatering assembly is arranged on one side of the first driving assembly, a second driving assembly is arranged in the cylinder and rotationally connected with the cylinder, and a sewage pumping assembly is arranged at the top of the supporting frame. According to the invention, dual blockage clearing of crushing blockages by the conical rod and purging by high-pressure gas is conveniently realized, shutdown disassembly is not needed, continuous smoothness of the water outlet hole is guaranteed, stable efficiency of centrifugal dewatering is maintained, and the dewatering effect is enhanced.

The invention provides a polysilicate aluminum zirconium coagulant as well as a preparation method and application thereof, and relates to the technical field of solid waste recycling. The preparation method of the polysilicate aluminum zirconium coagulant comprises the following steps: S1, activation preparation of a polysilicate solution; S2, introduction and pre-complexation of a metal salt solution; and S3, alkalization induced polymerization and curing. According to the invention, the efficient charge neutralization capability of zirconium and aluminum metal ions and the long-chain network structure characteristic of polysilicic acid are organically combined through a copolymerization reaction by molecular design, the developed polysilicate aluminum zirconium coagulant can maintain a good coagulation effect in a wide pH range, is suitable for treating residual sludge with different sources and properties, and has a good coagulation effect under the dosage of 7.5%. The CST value is reduced to 35.4 s from 190.7 s, the water content of a filter cake is reduced to 77.4%, and the Zeta potential is-8.2 mV, so that the polysilicate aluminum ferric coagulant is obviously superior to a traditional polysilicate aluminum ferric coagulant, and has the advantages of high operation flexibility, good process stability and good application prospect.

The invention belongs to the technical field of water treatment, and particularly relates to a preparation method and application of a PDA / CS composite adsorbent loaded with a bimetallic system, and the preparation method comprises the following steps: 1) dissolving dopamine in a Tris buffer solution to prepare a dopamine prepolymer solution; then adding FeCl3, and carrying out constant-temperature water bath; centrifuging the obtained black suspension, performing suction filtration, washing, collecting a filter cake, and performing freeze drying to obtain PDA microspheres; 2) dispersing PDA microspheres in deionized water, and carrying out ultrasonic treatment until the PDA microspheres are uniformly dispersed; 3) dissolving chitosan in an acetic acid solution, and adding CuCl2 to prepare a mixed solution; the suspension obtained in the step 2 is dropwise added into a mixed solution for constant-temperature water bath, the pH of the mixed solution is adjusted through a NaOH solution, glutaraldehyde is added for constant-temperature water bath after constant-temperature water bath, and 4, the obtained suspension is subjected to centrifugation, suction filtration, washing, filter cake collection and freeze drying.

The invention discloses a method for extracting copper fine powder by flotation of copper-containing ore, which belongs to the technical field of mineral processing, and comprises the following steps: after copper-containing raw ore is crushed, ground and classified by a cyclone, overflow enters flotation, and settled sand is returned for regrinding; sodium carbonate is added into graded overflow to adjust the pH, a sodium hexametaphosphate-polyacrylamide composite dispersant is added, and copper sulfate is added and stirred after low-temperature microwave heating; gradient flotation is conducted, specifically, copper sulfide is roughly selected, the pH is adjusted, an amino-sulfonic acid group synergistic modified layered double metal hydroxide / cobalt ferrite composite collecting agent is added, and rough concentrate 1 is obtained through high-frequency pulse air inflation flotation; copper oxide roughing is conducted, clear water is supplemented to adjust the pH, and a collecting agent is supplemented to obtain rough concentrate 2; scavenging is performed for three times, a collecting agent is added for flotation, and concentrate returns to the previous stage; the rough concentrates are combined, and magnetic impurities are removed through high-gradient magnetic separation to obtain magnetic concentrates; and carrying out microbiological leaching on tailings to recover copper. The composite collecting agent is prepared through layered double hydroxide carrier synthesis, amino modification, sulfonic acid group grafting and cobalt ferrite anchoring.

The invention discloses a preparation process of berberine hydrochloride, and belongs to the technical field of berberine production. The invention relates to a berberine hydrochloride preparation process, which comprises: S1, mixing a ferric sulfate-aluminum sulfate composite salt, sodium chloride, zinc chloride and anhydrous formic acid, pre-activating, adding N-2, 3-dimethoxybenzyl homopiperony lamine hydrochloride, dropwise adding a glyoxal mixed solution, and carrying out a reflux reaction. And S2, cooling the reaction liquid until a solid is separated out, filtering, adding a filter cake and diatomite into purified water, stirring, adjusting alkali, heating, and continuously stirring for 0.5-1 hour. Cooling and filtering, and reserving filtrate; s3, adjusting the acidity of the filtrate, cooling and growing crystals; and filtering, rinsing a filter cake, and carrying out vacuum drying on the filter cake to obtain berberine hydrochloride. The berberine hydrochloride prepared by the method is high in yield and purity, and the preparation process is safe, short in flow and friendly to human bodies and environment.

The invention discloses a gypsum dehydration control method and system based on multi-parameter collaborative optimization, belongs to the technical field of gypsum dehydration control, and solves the problem of how to improve gypsum dehydration efficiency under a dynamic working condition. Comprising the steps of collecting key operation parameters, a parallel operation mechanism model and a data driving model in the gypsum dehydration process in real time, constructing a weighted multi-objective optimization function based on constraint conditions, performing real-time optimization by adopting model prediction control, and performing global multi-objective optimization by adopting a periodic evolutionary algorithm. Generating a final control instruction based on the fusion strategy and issuing the instruction to an execution mechanism; by combining multivariable real-time prediction, closed-loop optimization control and a self-adaptive learning mechanism, intelligent management is carried out on the dehydration process of the wet desulphurization byproduct gypsum, accurate control over the water content of a filter cake, optimization of washing water and energy consumption and high adaptability of a control system to dynamic working conditions are achieved, and the dehydration efficiency of the wet desulphurization byproduct gypsum is improved. Therefore, on the premise of ensuring the quality of the gypsum, the dehydration efficiency is maximized and the resource consumption is minimized.

The invention discloses a method and system for preparing iron phosphate through an iron powder method based on oxygen micro-nano bubbles and application, and belongs to the technical field of iron phosphate preparation. The method comprises the following steps: pulping iron powder and pure water, injecting the pulped iron powder and pure water into an iron dissolving reaction kettle, adding phosphoric acid, and carrying out a leaching reaction under corresponding preset conditions to obtain a first solution containing ferrous dihydrogen phosphate; after solid-liquid separation, pumping the second filtrate into an oxidation kettle, introducing oxygen micro-nano bubbles by using a micro-nano bubble generator, and carrying out oxidation reaction on the second filtrate and ferrous dihydrogen phosphate under corresponding preset conditions to obtain a third solution containing amorphous hydrated iron phosphate and phosphoric acid; pumping the third solution into an aging kettle, and aging the amorphous ferric phosphate hydrate to generate ferric phosphate dihydrate, so as to obtain a fourth solution; after solid-liquid separation, washing the iron phosphate dihydrate, and carrying out flash evaporation drying on a filter cake to obtain dry powder; and roasting and dehydrating to finally obtain the battery-grade anhydrous iron phosphate. According to the method, reaction conditions are accurately controlled, oxygen micro-nano bubbles are innovatively introduced for oxidation, and a new way is provided for preparing high-performance products.

The invention discloses a membrane separation and concentration system for treating solid waste incineration fly ash, relates to the technical field of membrane separation, and aims to solve the technical problem that a concentrated solution is difficult to form a high-concentration state due to reduction of membrane flux caused by thickening of a filter cake layer. An annular filter membrane is installed on the rotating frame, a concentration chamber is formed in an inner cavity of the annular filter membrane, a supporting pipe body is arranged in the concentration chamber, a liquid inlet channel is arranged in an inner cavity of the supporting pipe body, and a plurality of gathering plates and collecting assemblies are further arranged in the concentration chamber. The device has the advantages that a stable filter cake layer formed on the surface of the membrane during static filtration is broken, membrane hole blockage caused by continuous deposition of impurities is avoided, a concentrated solution can be in full contact with a new filter hole area, which does not participate in preliminary filtration, of the annular filter membrane, the filter area of the filter membrane is utilized to the maximum extent, and the filter efficiency and the concentration multiple are improved.

The invention provides a method for preparing aluminum oxide and extracting lithium from lithium-rich bauxite waste rocks, and belongs to the technical field of solid waste comprehensive utilization. The method comprises the following steps: crushing and grinding the lithium-rich bauxite waste rocks, mixing with an acid mixed solution, leaching to remove iron to obtain a low-iron filter cake, adding concentrated sulfuric acid, roasting, curing, leaching with water, carrying out hot filtration to obtain a filtrate, adding a crystallizing agent, dissolving, evaporating to obtain a steel belt crystallizer crystal, stirring and washing a saturated solution to obtain a lithium-containing solution and low-iron aluminum ammonium sulfate, purifying the lithium-containing solution to remove impurities, and precipitating lithium with sodium carbonate to prepare lithium carbonate; and calcining the low-iron ammonium aluminum sulfate to prepare aluminum oxide. The method provided by the invention has the advantages of simple process, low energy consumption in roasting and leaching of aluminum and lithium, high recovery rate of valuable components of aluminum and lithium, high iron removal rate, high separation efficiency of aluminum and lithium, low extraction cost of aluminum and lithium, recyclability of the crystallizing agent and the like, is easy for industrial implementation, and greatly improves the comprehensive utilization value of the lithium-rich bauxite waste rocks.

The invention relates to the technical field of sludge filter pressing, in particular to a sludge filter pressing system based on automatic operation, which is characterized in that a dynamic monitoring module is used for acquiring a falling track of a filter plate according to a falling image of the filter plate so as to determine a falling expression length interval of a filter cake falling to a conveying belt; whether the filter cake falling process is abnormal or not is judged through a feature recognition module, falling state characterization vectors of the filter cake at all falling positions are constructed through an abnormality analysis module, and the filter cake recognition state is determined according to the comparison result of the falling state characterization vectors; sludge filter pressing is automatically adjusted through the filter pressing management module, pushing parameters of a high-pressure medium in a filter plate interlayer are adjusted, or the washing unit is controlled to carry out pressurized washing on characteristic marking filter cloth, and then abnormal adhesion attributes are distinguished by dynamically monitoring and analyzing a filter cake falling track and deviation characteristics; the sludge filter pressing process is self-adaptively regulated and controlled, and the continuous filter pressing stability of the sludge is improved.

The invention relates to a method for preparing sodium aluminate and co-producing flame-retardant grade aluminum hydroxide from secondary aluminum ash, and belongs to the technical field of solid waste resource utilization. The method comprises the following steps: proportioning secondary aluminum ash, bauxite, sodium carbonate and bluestone according to a specific ratio, ball-milling and mixing, and calcining at a high temperature to obtain a sodium aluminate clinker; stirring and leaching the clinker and the leaching solution under specific conditions to obtain a sodium aluminate crude solution and red mud slag; adding an impurity removal agent into the sodium aluminate crude liquid in stages, carrying out normal-pressure and high-temperature stirring reaction, and carrying out ultrasonic-assisted treatment to obtain sodium aluminate fine liquid; adding a seed crystal into the sodium aluminate fine liquid, cooling step by step under a specific stirring condition for decomposition, and after decomposition, carrying out ultrasonic washing, wet grinding, drying and grading treatment on an aluminum hydroxide filter cake to obtain flame-retardant grade aluminum hydroxide; and concentrating the sodium aluminate fine liquid, desalting, cooling, drying and crushing to obtain sodium aluminate solid powder. According to the invention, high-valued utilization of the secondary aluminum ash is realized, the obtained flame-retardant grade aluminum hydroxide has high whiteness, controllable granularity and high purity of sodium aluminate, and is suitable for industrial production.

The invention discloses a fly ash washing dechlorination and resource utilization method. The method comprises the steps of fly ash pretreatment, size mixing treatment, enhanced washing and solid-liquid separation, filter cake treatment and mixed washing liquid purification and salt separation crystallization. Through a multi-dimensional synergistic strengthening means, the fly ash dechlorination efficiency is remarkably improved, resource utilization is achieved, the sodium citrate and lauryl sodium sulfate composite additive is adopted, Zeta potential real-time monitoring and pulse type supplementing are combined, fly ash particles are effectively dispersed, mass transfer resistance is destroyed, dissolution of chloride ions is promoted, and the dechlorination effect of the fly ash is improved. Moreover, gradient heating, electric field assistance and redox potential regulation are introduced, so that heavy metal dissolution is inhibited while efficient dechlorination is performed.

The invention discloses a lithium dihydrogen phosphate extraction preparation and by-product recycling method, and belongs to the technical field of new energy battery material preparation. The method comprises the following steps: carrying out impurity removal pretreatment on a lithium-containing solution, and selectively extracting lithium ions by utilizing a synergistic extraction system; after washing, carrying out reverse extraction by using phosphoric acid or a phosphoric acid solution containing lithium dihydrogen phosphate to obtain high-concentration and low-impurity reverse extraction liquid; and after the strip liquor is subjected to oil removal, a filter cake generated in the system is recycled to adjust the pH value, then alkaline lithium salt is supplemented to accurately adjust the pH value to 4-5, and battery-grade lithium dihydrogen phosphate is obtained through hot filtration, cooling, pressure reduction, evaporation and crystallization. According to the method, the filter cake (containing dilithium hydrogen phosphate, lithium phosphate and the like) generated by hot filtration is innovatively returned to be used for adjusting the pH value, and the crystallization mother liquor is used for replacing process water to be used for preparing the stripping agent, so that cyclic utilization is realized; when sodium ions in the mother liquor are accumulated to exceed the standard, lithium in the mother liquor is further recycled to generate lithium phosphate to return to the system. The method provided by the invention realizes efficient extraction of lithium and direct preparation of battery-grade lithium dihydrogen phosphate, completes in-system closed-loop utilization of all byproducts, has the advantages of short process, high yield, low cost and environmental friendliness, and is suitable for industrial continuous production.

The invention discloses a method for reducing the content of iron in rare earth chloride, which comprises the following steps: step 1, adding alkali slurry into heavy sand slurry containing ferrous ions to adjust the pH value to 1-2, then adding an oxidizing agent, and reacting for 2-3 hours at the temperature of 30-45 DEG C to oxidize the ferrous ions into ferric ions to obtain first rare earth slurry, the concentration of ferrous ions is 0.1-0.2 g / L; 2, the pH value of the first rare earth slurry is adjusted to 3.8-4.2, a reaction is conducted for 1.5-2.5 h at the temperature of 62-68 DEG C, so that ferric ions form precipitates, and second rare earth slurry is obtained; 3, carrying out solid-liquid separation on the second rare earth slurry to obtain an optimal solution filtrate and a filter cake; and step 4, performing removal, solid-liquid separation, evaporation and concentration on the optimal solution filtrate to obtain a rare earth chloride product with the iron content lower than 0.05%. The invention aims to introduce hydrogen peroxide in the thorium neutralization and deposition stage to reduce the accumulation of iron impurities in the circulation process.

The invention relates to the technical field of sludge treatment and recycling, in particular to a novel sludge conditioner for a novel filter press, which is prepared from the following components in percentage by weight: 15 to 30 percent of modified humate, 5 to 12 percent of compound enzyme preparation, 8 to 20 percent of zwitterionic polymeric flocculant, 20 to 40 percent of inorganic skeleton construct, 3 to 10 percent of oxidant and 10 to 25 percent of hydrophobic modified mineral particles. And the balance of pH regulator and deionized water. According to the novel sludge conditioner disclosed by the invention, by compounding modified humate and other core components, a synergistic action mechanism is constructed, so that the water content of a sludge filter cake is less than or equal to 50-60%, the weight of the filter cake is reduced by over 20%, the COD (Chemical Oxygen Demand) of filtrate is reduced by over 30%, the novel sludge conditioner is adaptive to various filter presses, the filter pressing period is shortened by over 15% through an optimized conditioning process, the productivity is improved, and the treatment cost and the environmental protection pressure are reduced.

The invention discloses a plate-and-frame filter press for a sludge dewatering machine room, which comprises alternately arranged filter plates, filter frames and filter cloth covering the filter plates, vibration support hole groups are arranged in grooves of the filter plates along diagonal lines, and hydraulically driven vibration support components are arranged in the holes; when the filter plate and the filter frame are in press fit, the hydraulic lifting mechanism pushes the vibration supporting assembly to jack the filter cloth to prevent sinking, and the built-in micro servo motor drives the arc-shaped vibration block and the groove to be meshed / separated periodically, so that the vibration supporting plate vibrates longitudinally to dredge filter cloth meshes and promote a filter cake to fall off. Anti-collapse supporting and on-line vibration cleaning of the filter cloth are achieved, the blocking problem can be solved without disassembling the machine, and the dewatering efficiency is remarkably improved.

The invention discloses a multi-stage separation synergistic power coal washing process, and belongs to the technical field of coal washing processing. The TDS intelligent dry separation system, the dry-wet combined desliming process, the super coal slime classification cyclone, the super coal slime dense medium cyclone and the ultrahigh-pressure elastic squeezing filter press are in multi-stage cooperative linkage to be used for power coal washing, the moisture content and the ash content are reduced to the maximum extent in the separation stage, and the heat productivity of the power coal is increased. Compared with a process before improvement, the power coal washing process with cooperation of multi-stage separation has the advantages that the gangue sorting efficiency and the power coal productivity are improved, the super coal slime dense medium cyclone, the super classification cyclone and the ultrahigh-pressure elastic squeezing filter press are orderly used in the power coal washing process, the water content of a filter cake is greatly reduced, and the water content of the filter cake is greatly reduced. The water content of the filter cake is obviously superior to that of a common quick-opening membrane filter press and is lower than that of the filter cake of dried coal slime, so that the fluctuation range of the heat value of the power coal is lower, the heat value of gangue is reduced, and the heat value of the power coal is improved.

The invention belongs to the technical field of carbon nanotube dispersion, and particularly relates to a preparation method of a water-based single-walled carbon nanotube dispersion liquid. The preparation method comprises the following steps: adding a single-walled carbon nanotube into an organic solvent, uniformly stirring, carrying out dispersion treatment, adding a first surfactant into the obtained pretreated slurry A, uniformly stirring, carrying out ultrasonic dispersion to obtain slurry B, carrying out vacuum filtration on the slurry B, washing, and baking a collected filter cake to obtain the single-walled carbon nanotube composite material. The single-walled carbon nanotube C, a second surfactant and water are subjected to dispersion treatment, and the carbon nanotube adsorption material is obtained. The water-insoluble first surfactant is introduced to form a dry powder intermediate, so that secondary agglomeration is effectively inhibited, efficient and stable dispersion is realized while the structural integrity of the carbon nanotubes is maintained, and the preparation process is simple and suitable for industrial popularization and application.

The invention relates to the field of aluminum electrolysis industrial solid waste resource recycling, in particular to a method for preparing regenerated aluminum fluoride from aluminum electrolysis fluorine-containing solid waste. The method comprises the following steps: crushing and grinding the fluorine-containing solid waste, and mixing the crushed and ground fluorine-containing solid waste with anhydrous aluminum sulfate, aluminum fluoride seed crystals and a carbonaceous additive; carrying out heating reaction on the mixture at 500-700 DEG C, washing with water, and filtering; and drying the filter cake to obtain a regenerated aluminum fluoride product. According to the method, the aluminum fluoride seed crystal is introduced to promote reaction conversion, the calcium sulfate byproduct is subjected to in-situ reduction removal by using the carbon additive, and the sodium is deeply removed through heat treatment and high-temperature distillation, so that the obtained regenerated aluminum fluoride product is high in purity and low in sodium and sulfur content, and can be directly reused in an electrolytic cell. According to the technical scheme, high-value utilization of the aluminum electrolysis fluorine-containing solid waste is achieved, and environmental and economic benefits are achieved.

The invention belongs to the field of biofuel preparation through grease hydrogenation, and provides a catalyst for biofuel preparation through waste grease one-step hydrogenation and a preparation method of the catalyst. The catalyst is a non-supported NixMoyWz-kHY catalyst, and the preparation method of the catalyst comprises the following steps: uniformly mixing a nickel source, a molybdenum source and a tungsten source according to a certain proportion, adding deionized water and a reaction aid ethylene glycol, dissolving, heating, stirring, adding an ammonia water-ethanolamine mixed solution, complexing, steaming until the pH value of the solution is 7-8, and filtering to obtain the catalyst. And adding a certain amount of HY molecular sieve powder, methyl cellulose (MC) and citric acid into the solution, filtering the reaction solution, drying the filter cake at 120 DEG C, performing extrusion molding, and roasting to obtain the catalyst. The catalyst provided by the invention effectively solves the problems of high oxygen content, difficulty in deep isomerization and the like in the waste oil and fat, has the functions of hydrodeoxygenation, cracking and isomerization at the same time, and realizes one-step conversion of the waste oil and fat into biological aviation kerosene and biodiesel. Besides, the non-supported catalyst adopted by the invention has high-activity center density, the problems of aging and shedding of the carrier are not needed to be worried about, and the preparation method of the catalyst is simple, environment-friendly and pollution-free, and meets the requirements of industrial preparation.

Disclosed in the present invention is a monodisperse nanocalcium carbonate-based foliar calcium fertilizer, comprising the following raw materials in parts by mass: 1-20 parts of a monodisperse nanocalcium carbonate filter cake, 0.05-0.9 parts of ethoxy-modified polytrisiloxane, 0.01-0.8 parts of modified casein, 0.01-0.8 parts of an enzyme, 0.05-0.9 parts of a sugar alcohol, and 10-180 parts of water. After being diluted by means of water such that the solid content of calcium carbonate is 0.5-2%, the foliar calcium fertilizer is used for foliar calcium supplementation of various crops and fruit and vegetable crops. The novel foliar calcium fertilizer is safe and non-toxic, can be directly sprayed onto foliar and fruit surfaces of crops and fruits and vegetables, effectively ensures calcium absorption and utilization in crops, achieves the effect of increasing yield and increasing income, and can also improve the yield of fruits and vegetables.

This invention discloses an ionic liquid graft-modified starch-based filtration loss reducer, its preparation method, and its application. The filtration loss reducer comprises cross-linked starch and 50%–300% by weight of polymeric monomers of the cross-linked starch; wherein the cross-linked starch comprises starch and 0.1%–5% by weight of a cross-linking agent; the polymeric monomers are a composition of alkenylamide monomers, alkenyl sulfonic acid monomers, polymerizable imidazole salt ionic liquid monomers, and N-vinylpyrrolidone monomers. The embodiments of this invention improve the temperature resistance of the starch itself by using a cross-linking agent; improve the temperature resistance of the polymer by using sulfonic acid groups and pyrrolidone; and simultaneously introduce imidazole salt ionic liquids, which not only promote the dispersion of clay particles but also improve the quality of the filter cake, thereby reducing filtration loss.

A production process for preparing potassium chloride by using underground native carnallite ore comprises the following steps: carrying out primary crushing on the underground native carnallite ore, combining a material obtained by carrying out secondary crushing on an oversize material with an undersize material, conveying the combined material to a decomposer or a crystallizer, adding a beneficiation reagent into decomposed slurry or underflow slurry of the crystallizer, and carrying out roughing, roughing concentrate K1 and roughing tailings T1 are obtained; roughing tailings T1 are conveyed to a thickener, overflow of the thickener is collected and then returns to a decomposing tank for size mixing or flotation size mixing, and underflow of the thickener is subjected to ore grinding operation; materials discharged by the mill are conveyed to middling flotation operation to obtain middling flotation concentrate K2 and flotation tailings T2, the middling flotation concentrate K2 and decomposed slurry of the decomposing tank are subjected to roughing operation together, and roughing concentrate K1 is obtained; and the roughing concentrate K1 is subjected to secondary concentration to obtain crude potassium slurry K4, the crude potassium slurry K4 is filtered to obtain a crude potassium filter cake K5, and the crude potassium filter cake K5 is washed and filtered to obtain a potassium chloride wet material product. The product is high in recovery rate and proper in particle size.

The application discloses a sweet wormwood extract, a preparation method and application thereof and a sweet wormwood extract veterinary drug, and the method comprises the following steps: S1, heating and extracting sweet wormwood byproducts with an extraction solvent, filtering, discarding the filtrate, and obtaining an intermediate product filter cake; S2, concentrating the intermediate product filter cake to a constant weight; S3, heating and extracting the constant weight obtained in the step S2 with deionized water, filtering, and taking the filtrate; S4, concentrating the filtrate obtained in the step S3 to a constant weight, and obtaining the sweet wormwood extract. The application provides a sweet wormwood extract and a preparation method thereof, and provides a veterinary drug based on the sweet wormwood extract; the veterinary drug obtained by the application can clear heat, resolve summer-heat, and relieve deficiency heat, and can be used for treating various livestock and poultry diseases; the preparation method is simple, easy to operate, raw materials are easy to obtain, production cost is low, and the application has a good market application prospect.

The utility model discloses a multifunctional high-pressure washing plate frame automatic dehydrator, which relates to the technical field of dehydrator equipment and comprises a device shell, a support frame is arranged on the outer wall of the device shell, an electric push rod is arranged at the top of the support frame, and a limiting plate is mounted at the bottom of the electric push rod. A plurality of sets of balls are arranged at the two ends of the limiting plate, a positioning plate is arranged at one end of each ball, a spring is arranged at the other end of each positioning plate, and round holes are formed in the two ends of the supporting frame. Through the arrangement of the limiting plate, the surface of the filter plate is cleaned from top to bottom, filter cake residues on the surface of the filter plate are greatly reduced, the working efficiency of secondary cleaning of equipment by workers is improved, through the arrangement of the positioning plate and the spring, the balls and the filter plate are attached to clean impurities on the surface of the filter plate in an attached mode, and the service life of the filter plate is prolonged. Therefore, the working efficiency of scraping filter cake residues by the limiting plate is improved.