895 results about "Chloride potassium" patented technology

The invention provides a process for recovering various valuable elements such as lead, zinc, silver and potassium from soot of a steel mill. The process comprises the following steps of water leaching, fluorine removal, high-temperature concentration, primary cooling crystallization, secondary cooling crystallization, secondary leaching, ammonia leaching and ammonia distillation. According to the recovery process, potassium in the soot of the steel mill is recovered in the form of potassium chloride, zinc is recovered in the form of zinc sulfate, silver is recovered in the form of silver chloride, only auxiliary materials such as sulfuric acid, ammonia water and calcium chloride which are low in price are used in the whole recovery process, the cost is low, no waste water or waste residues are generated in the whole process, the direct recovery rate of lead and zinc is 95% or above, and the production cost is low. The direct recovery rate of silver is 98% or above, and the method has practical application value.

The invention relates to a method for recovering mixed salts (mainly containing calcium chloride, sodium chloride and potassium chloride) from a household garbage incineration fly ash leaching solution, and particularly provides two separation technical schemes. The traditional separation method generally needs to use a large amount of decalcifying agent, so that the cost is high, calcium chloride cannot be effectively recycled, and the problem of resource waste exists. In order to solve the problems, the invention selectively dissolves calcium chloride in the mixed salt by adopting a specific organic solvent (such as ethanol or methanol) and utilizing the characteristics that the solubility of calcium chloride in the solvent is high, the solubility of sodium chloride and potassium chloride is low, and the boiling point is relatively low. And a calcium chloride product can be recovered after solvent evaporation. Furthermore, the residual mixed salt is further washed using the specific organic solvent to remove entrained calcium chloride, thereby obtaining a mixed salt containing predominantly sodium chloride and potassium chloride. According to the technical scheme 1, the mixed salt subjected to separation and calcium removal is subjected to dissolution treatment under the high-temperature condition, potassium chloride is dissolved, the particle size of sodium chloride crystals is promoted to be increased, the sodium chloride crystals are obtained through solid-liquid separation, and then mother liquor is cooled and crystallized to recover potassium chloride. According to the technical scheme 2, the mixed salt subjected to separation and calcium removal is subjected to aging treatment so as to promote particle size increase of sodium chloride and potassium chloride crystals, then the aged mixed salt is separated by adopting a flotation method, and sodium chloride and potassium chloride products are recycled respectively.

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 relates to the technical field of particle refining agents, in particular to a 7-series aluminum-zinc alloy particle refining agent which comprises the following raw materials in parts by weight: 35-45 parts of potassium chloride, 10-15 parts of calcium fluoride, 7-11 parts of a graphene modifier, 6-8 parts of a modifier based on modified sol and 5-8 parts of magnesium chloride. According to the particle refining agent, potassium chloride, calcium fluoride and magnesium chloride are adopted as a refining agent matrix, the graphene modifier and the modifier based on modified sol are added to be blended, coordinated and jointly synergized, the obtained refining agent product can optimize the hydrogen removal rate and the slag removal rate performance, meanwhile, the effect of improving the strength and the elongation performance of aluminum-zinc alloy is obvious, and the refining agent is suitable for industrial production. And the corrosion resistance and the heat-resistant stability of the product are optimized.

The invention relates to the technical field of fertilizers, and discloses a slow-release coated fertilizer and a preparation method thereof. Comprising the following raw materials in parts by weight: 57 to 77.6 parts of urea, 14.25 to 24.25 parts of diammonium phosphate, 0 to 5 parts of calcium superphosphate, 4.75 to 14.55 parts of potassium chloride, 0.03 to 0.2 part of chitosan, 0.0075 to 0.05 part of nano silicon dioxide, 0.001 to 0.015 part of glutaraldehyde, 2.96 to 4.94 parts of deionized water, 0.01 to 0.1 part of bacillus subtilis, 0.05 to 0.2 part of mesoporous silicon dioxide loaded nano selenium and 0.5 to 1 part of potassium fulvate. Chitosan, nano silicon dioxide and glutaraldehyde are matched with one another, and chitosan has pH responsiveness, so that the problems that a coating layer of a traditional slow-release fertilizer is prone to being affected by the environment and broken in advance, nutrients are rapidly released, and the slow-release effect is reduced are solved.

The invention discloses a method for removing iron impurities in regenerated aluminum alloy, and belongs to the field of non-ferrous metal regeneration, recovery and impurity removal. The method comprises the following steps: weighing an iron removal flux (25-45 wt.% of boron-containing potassium fluoride, 20-30 wt.% of sodium chloride and 20-35 wt.% of potassium chloride) according to the mass percentage, stirring, mixing and drying; according to the method, the aluminum scrap is put into the smelting furnace to be smelted, then the iron removal flux and the permanganate catalyst are added into the aluminum scrap melt, stirring and standing are carried out, the aluminum melt with the iron impurity element removed is obtained, the method does not affect the aluminum obtaining rate, meanwhile, the iron content is remarkably reduced, and the method is applied to aluminum ingots obtained through green regeneration smelting of the aluminum scrap and has the beneficial effects that the cost is low; the environment is not damaged and the steps are simple.

The present invention provides a hemodialysis concentrate and a preparation method thereof, belonging to the technical field of pharmaceutical preparations, the hemodialysis concentrate includes liquid A and liquid B; liquid A includes sodium chloride, potassium chloride, magnesium chloride, calcium chloride and citric acid; liquid B includes sodium bicarbonate; the method for preparing liquid A is: sodium chloride, potassium chloride, calcium chloride and magnesium chloride are added to dialysis water, and the feed is fed once, stirred evenly and then filtered in a circulation manner; after the quality inspection is qualified, citric acid is added for secondary feeding, pH=1.5~1.7 is controlled, stirred and circulated, and liquid A is obtained after the citric acid is tested and qualified; the method for preparing liquid B is: sodium bicarbonate is added to dialysis water, stirred evenly and then filtered in a circulation manner, and liquid B is obtained after the quality inspection is qualified. The present invention uses citric acid as the acid solution of liquid A, adopts secondary feeding when preparing liquid A, adjusts the addition order of the liquid preparation raw materials, and controls the temperature and pH value, so as to prepare a hemodialysis concentrate with high stability and strong quality and safety.

Compositions and methods for cleansing the eyelid and treating an ocular condition with an ophthalmic composition consisting essentially of water, PEG-80 sorbitan laurate, methyl gluceth-20, PEG-120 methyl glucose dioleate, phytosphingosine HCl, decyl glucoside, 1,2-hexanediol, caprylyl glycol, disodium cocoamphodiacetate, panthenol, polyaminopropyl biguanide, sodium chloride, potassium chloride and calcium chloride.

The invention provides a method for promoting generation of tea acid from Nemania sp YAFEF112, and relates to the technical field of microbial culture. According to the method, mycelia of Nemania sp YAFEF112 are inoculated into a culture medium containing pruned walnut branches for culture, the culture medium is an MM culture medium, and the specific formula of the culture medium comprises 1.52 g / L of monopotassium phosphate, 0.52 g / L of magnesium sulfate, 6 g / L of sodium nitrate and 0.52 g / L of potassium chloride. According to the method, the defects in the prior art are overcome, and good conditions are provided for the production of the tea pickled acid by optimizing the formula of the fermentation culture medium, adding pruned walnut branches into the culture medium, improving the fermentation conditions and increasing the content of the tea pickled acid in the Nemania sp YAFEF112 hyphae.

The invention discloses a method for yeast-assisted synthesis of porous carbon / vanadium sulfide nano-enzyme and application of the porous carbon / vanadium sulfide nano-enzyme in serum creatinine detection, and belongs to the technical field of serum creatinine detection. Comprising the following steps: (1) mixing saccharomycetes, vanadium chloride and ethanol, performing ultrasonic dispersion, and stirring until liquid is completely volatilized to obtain a first solid A; (2) mixing and grinding the first solid substance A, potassium carbonate and potassium chloride to obtain a second solid substance B; (3) respectively placing the second solid substance B and thioacetamide in grooves at the left end and the right end of a Joule thermal device graphite sample table, and carrying out rapid Joule thermal shock to obtain a third solid substance C; and (4) washing and drying the third solid C to obtain the porous carbon / vanadium sulfide nano-enzyme. A colorimetric sensing method is constructed based on the nano-enzyme prepared by the invention, is used for creatinine detection, and has extremely low detection limit, LOD is as low as 0.07 M / mL, and high specificity and sensitivity are embodied.

The invention discloses a potassium-doped chain-shaped manganous-manganic oxide positive electrode material and a preparation method and application thereof, and belongs to the field of aqueous zinc ion batteries, and the preparation method comprises the following steps: preparing a mixed solution of isopropanol and deionized water; the preparation method comprises the following steps: under magnetic stirring, dissolving manganese acetate, potassium chloride and nitrilotriacetic acid into a mixed solution, and preparing K-Mn-NTA, namely a K-Mn-NCs precursor, through a hydrothermal method; then, K-Mn3O4-NCs is prepared through an annealing method; and finally, carrying out in-situ polymerization on polyaniline on the K-Mn3O4-NCs to obtain the K-Mn3O4-NCs coated PANI. When the positive electrode material is applied to the zinc ion battery, the cycle performance and the rate capability of the zinc ion battery can be improved, the conductivity of the positive electrode material is improved, the dissolution of Mn is inhibited, and the electrochemical performance of the zinc ion battery is improved.

The invention discloses a sugar-free electrolyte beverage and a preparation method thereof, and relates to the technical field of functional beverages. The sugar-free electrolyte beverage comprises the following components in parts by weight: 80-90 parts of erythritol, 0.5-2 parts of an electrolyte component, 0.4-0.8 part of a buffer agent, 0.1-0.2 part of vitamin B6, 0.1-0.5 part of taurine, 1-3 parts of an auxiliary agent and 1000-1200 parts of water, the electrolyte component comprises at least four of edible salt, potassium chloride, magnesium sulfate, calcium lactate and calcium citrate, the buffer agent comprises potassium dihydrogen phosphate and sodium citrate, and the auxiliary agent comprises sodium dihydrogen phosphate and sodium citrate. The auxiliaries comprise citric acid, sodium benzoate and essence. The sugar-free electrolyte beverage disclosed by the invention is high in blood osmotic pressure recovery speed, does not cause blood sugar fluctuation when supplementing electrolyte for a human body, and tastes fresh and cool.

The present invention relates to a high-salt wastewater resource utilization technology, particularly to the resource utilization of potassium nitrate mother liquor, and specifically to a method for recycling potassium resources in the potassium nitrate mother liquor. The method comprises brine adjustment, first-stage cooling, second-stage cooling, solid-liquid separation, decomposition and washing, and evaporation and concentration. A decomposition liquid produced by the decomposition and washing is mixed with a concentrated liquid produced by evaporation and concentration to adjust the MgCl2 content in the system. The brine-adjusted system is cooled in two stages, followed by solid-liquid separation to obtain a crystalline solid and a crystalline mother liquor. The crystalline solid is added to the potassium nitrate mother liquor and stirred thoroughly, followed by solid-liquid separation to obtain potassium chloride solid and a decomposition liquid. The potassium chloride solid is reused as a production raw material. The crystalline mother liquor is evaporated and concentrated, and a portion of the concentrated liquid and the decomposition liquid are recycled by mixing brine. The remaining concentrated liquid is cooled to room temperature to obtain MgCl2·6H2O solid. The present invention recycles potassium chloride in the by-product mother liquor without adding additional steam and water.

The utility model relates to a system for preparing electronic-grade hydrochloric acid by using a Mannheim device. Comprising a potassium chloride storage tank, a desalted water pipeline and a concentrated sulfuric acid storage tank, the potassium chloride storage tank and the concentrated sulfuric acid storage tank are respectively connected with a Mannheim furnace, a byproduct hydrogen chloride gas pipeline of the Mannheim furnace is connected with a B acid washing tower, a gas pipeline in the B acid washing tower is connected with an A acid washing tower, and a gas pipeline in the A acid washing tower is connected with an inlet of a drying tower; a spraying pipeline at the upper part in the drying tower is connected with a concentrated sulfuric acid storage tank; a gas phase outlet of the drying tower is connected with an electronic-grade hydrochloric acid storage tank through a gas purifying and absorbing unit and a filtering unit in sequence; a bottom liquid phase outlet of the drying tower is connected with a concentrated sulfuric acid inlet of the Mannheim furnace; the method has the advantages of improving the added value of products and reducing the production cost.

The invention discloses a preparation technology of high-purity potassium chloride, and relates to the technical field of potassium chloride preparation, the preparation technology comprises the steps of raw material treatment, impurity removal, dissolution and filtration, a crystallization reaction kettle stage and drying and packaging, a driving motor is arranged at the top end of a crystallization kettle main body, and a reaction cavity is formed in the crystallization kettle main body; the inner wall of the collecting box is scraped through the edge of a fixed scraper, crystals which are not cleaned up on the surface of the collecting box are cleaned again through a Y-shaped scraper, and the situation that the crystals on the surface of the collecting box are omitted and left on the surface of the collecting box is avoided; the crystals on the surface of the collecting box are scraped, so that high-purity potassium chloride can be discharged, the end of the scraping knife is always in contact with the side wall of the collecting box, the potassium chloride crystals on the side wall of the collecting box are cleaned more thoroughly, and the collecting box and the stirring fork rotate in opposite directions, so that the potassium chloride crystals on the surface of the collecting box can be quickly cleaned.

The invention relates to a method for separating sodium and potassium from mixed sulfate containing sodium and potassium, which comprises the following steps: mixing the mixed sulfate containing sodium and potassium, a calcium-containing compound and water, dissolving and reacting to obtain potassium-removed mother liquor and double salt precipitate; performing first crystallization on the potassium-removed mother liquor to obtain a sodium sulfate product; mixing the double salt precipitate with water for elution treatment to obtain a potassium sulfate solution; performing secondary crystallization on the potassium sulfate solution to obtain a potassium sulfate product; according to the method, efficient separation of sodium and potassium in the mixed sulfate containing sodium and potassium is achieved, the purity of the obtained sodium sulfate product is preferably as high as 99.0% or above, the potassium content in potassium sulfate is preferably as high as 54.2 wt% or above based on the mass content of potassium oxide, the whole technological process is short, potassium chloride does not need to be added, the separation cost is low, waste gas, waste liquid and solid waste are not generated, and the method is suitable for industrial production. And green resource utilization of the mixed sulfate containing sodium and potassium is realized.

The invention discloses an anti-freezing solution for improving the survival rate of sperms of Chinese prawns and a cryopreservation method of the anti-freezing solution, and belongs to the technical field of low-temperature biology and reproductive science. The invention provides an anti-freezing solution for cryopreservation of sperms of Chinese prawns, which comprises a basic solution and an anti-freezing agent, and the anti-freezing agent is dimethyl sulfoxide with the volume fraction of 10% or glycerol with the volume fraction of 10%; the basic liquid contains 23.69 g of sodium chloride, 1.1 g of potassium chloride, 14.8 g of magnesium chloride hexahydrate, 4.3 g of sodium sulfate, 0.23 g of sodium bicarbonate, 1.12 g of calcium chloride and distilled water with the constant volume of 1000 mL. According to the cryopreservation method provided by the invention, 10% dimethyl sulfoxide or 10% glycerol is adopted as an antifreeze agent, the sperm density is controlled to be 1 * 10 < 7 > / mL, and step-by-step cooling is carried out, so that the survival rate of unfrozen sperms reaches 90% or above. The long-term preservation effect of the Chinese prawn sperms is remarkably improved, and the method is suitable for germplasm resource protection and efficient breeding.

The invention relates to the technical field of evaporative crystallization, in particular to a potassium chloride solution evaporative crystallization device. Comprising an equipment frame; a bottom plate is fixedly mounted on the equipment frame, and an evaporation mechanism is arranged on the bottom plate; according to the evaporation mechanism disclosed by the invention, the separation part is used for stirring in the evaporation process of the potassium chloride solution so as to improve the precipitation efficiency of crystals, and meanwhile, the precipitated crystals can be filtered to the drying part in time, so that the crystals are effectively prevented from being excessively increased in the evaporation barrel, the flowability of the solution is kept, and the stirring and heating uniformity is also ensured; the problem that the mixing efficiency is reduced due to increase of the crystals is avoided, and the crystals in the drying part are heated and pre-dried through the suction part by utilizing steam heat generated by evaporating the potassium chloride solution, so that the utilization rate of energy is increased.

The invention provides a method for removing calcium through reverse flotation of carnallite and a process for producing potassium chloride through reverse flotation cold crystallization. The method for removing calcium through reverse flotation of carnallite comprises the steps that a precipitant solution is added into saturated balanced brine ore pulp containing carnallite particles to precipitate Ca < 2 + >, then collecting reverse flotation is conducted on NaCl and CaSO4 through a NaCl collecting agent and a CaSO4 collecting agent, and carnallite concentrate is obtained; wherein the CaSO4 collecting agent comprises 60 to 80 weight percent of alkyl ether amine and 20 to 40 weight percent of modified fatty acid. According to the method, Ca < 2 + > is removed through the precipitant, then NaCl and CaSO4 are subjected to collecting and reverse flotation through the NaCl collecting agent and the CaSO4 collecting agent, the carnallite concentrate is obtained, production equipment cannot be blocked in the process of preparing the potassium chloride product, the quality of the potassium chloride product can be improved, the yield of the potassium chloride product can be increased, meanwhile, the productivity can be improved, and the production cost can be reduced.

The invention discloses a method for improving sodium chloride flotation efficiency in the reverse flotation process of potash fertilizer production. The method comprises the following steps: screening sodium-containing carnallite to obtain a first product and a second product; wherein the first product is an oversize product, the mass ratio of the first product to the sodium-containing carnallite is smaller than 5%, the content of NaCl in the undersize product is larger than 65 wt%, and the content of KCl in the undersize product is smaller than 5 wt%; and carrying out thickening and flotation treatment on the first product to prepare the low-sodium carnallite, wherein a flotation agent adopted in the flotation treatment comprises a flotation agent composition, and the flotation agent composition comprises dodecyl morpholine and an additive. By adopting a specific screening process and a special flotation reagent composition, the reverse flotation efficiency is improved while the content of fine-grained sodium chloride in the carnallite is reduced, so that the content of the fine-grained sodium chloride in the low-sodium carnallite is reduced, and the quality of potassium chloride is improved.

The invention discloses a production process for preparing potassium sulfate from glauberite by an asymmetric balance method, which is characterized in that two asymmetries are designed, one is that an evaporation system adopts a mode of feeding more cold clear liquid and discharging more salt mother liquid, evaporation is carried out according to a fixed proportion, enough evaporation condensate water can be evaporated in unit time, and the evaporation efficiency is improved; the excessive part is used for digesting water from an external supplementing system; secondly, the secondary conversion reaction is a reaction of a potassium chloride solution and glauberite in an equal proportion, the glauberite containing the glauberite is matched with anhydrous sodium sulphate to produce potassium sulfate, and the core is that the potassium index of a primary conversion reaction system is controlled by using the proportion of the glauberite containing the glauberite, so that the production quantity of the glauberite is adjusted; the potassium sulfate is matched with the evaporation and condensation water amount consumed due to equal-proportion dissolution, so that the overall balance is maintained for production, and meanwhile, the quality of the prepared potassium sulfate meets the quality requirements of agricultural potassium sulfate national standard GB / T 20406-2017 powder crystalline superior products (K2O is greater than or equal to 52%) and first-grade products (K2O is greater than or equal to 50%).

The invention relates to the technical field of extraction of lithium, potassium and boron in salt lakes, and discloses a method for co-producing lithium, potassium and boron by gradient utilization of original brine in salt lakes. The method comprises the following steps: S1, extracting lithium from original salt lake brine to obtain qualified lithium liquid and lithium extraction tail liquid; s2, preparing a battery-grade lithium product by using the qualified lithium liquid; s3, the lithium extraction tail liquid is subjected to beach drying through a salt pan, and potassium-containing solid salt (potassium mixed salt and carnallite), liquid old brine and bischofite are obtained; s4, preparing a potassium chloride product from the potassium-containing solid salt and bischofite; and S5, preparing a boric acid product by using the old brine. According to the method, a lithium extraction pre-treatment and salt lake brine potassium, boron and lithium process technical route is converted into a lithium, potassium and boron process route, the production cycle of a lithium salt product is shortened to 2 months from original 2-3 years, the lithium yield is increased by about one time, and meanwhile, the lithium-potassium-boron process is adopted, so that the problem that lithium extraction films and equipment are corroded and influenced by boron extraction acidification is solved, and the method is suitable for industrial production. Comprehensive development and utilization of salt lake resources are realized.

The invention discloses an antimony ion doped potassium chloride luminescent material as well as a preparation method and application thereof. The general chemical formula of the luminescent material is K (1-x) Cl: xSb < 3 + >, and x is 0.005-0.4. The antimony ion-doped potassium chloride luminescent material provided by the invention only has the luminescent intensity of 4.3% at room temperature after being heated to 373K and excited by a 366nm light source, and the relative sensitivity obtained at 293K by the formula # imgabs0 # (SR: relative sensitivity, omega: luminescence integral intensity, and T: temperature) reaches 3.2% K <-1 >. Therefore, the antimony ion activated potassium chloride luminescent material provided by the invention can measure the temperature according to the change of the emission spectrum integral intensity along with the temperature, and can be applied to the field of environment temperature measurement.

The invention discloses a composite inducer for promoting adhesion and metamorphosis of marine bivalve mollusk larvae and an application method of the composite inducer. The composite inducer for promoting adhesion and metamorphosis of the marine bivalve mollusk larvae comprises glutamine, glutamic acid, potassium chloride, calcium chloride and taurine, and the concentration ratio of the glutamine to the glutamic acid to the potassium chloride to the calcium chloride to the taurine is 1: 1: 2 * 10: 1.7 * 10: 4. According to the application, glutamine, potassium ions, calcium ions, glutamic acid and taurine are matched, the application effect of the glutamine, the potassium ions, the calcium ions, the glutamic acid and the taurine in the aspect of improving the attachment and metamorphosis rate of the shellfish larvae is defined, the technical blank of multi-component cooperative regulation and control of the attachment and metamorphosis of the shellfish at present is filled, a new solution is provided for bivalve shellfish fry production, and the application prospect is wide. The method is of great significance in promoting healthy development of the mariculture industry.

The present invention relates to a process for producing a controlled-release fertilizer for potassium chloride, which comprises the following steps: a. providing compacted KCl having a sphericity of below 0.87; b. dry polishing the KCl in a high-intensity mixer-type device comprising a container and at least one set of stirring elements, such that the KCl has a sphericity between 0.88 and 0.92; c. providing a coating on the polished KCl. In the case of a 6 pph coating, the polished and coated compacted KCl may exhibit a release of about 18% after 7 days when measured using a water leaching test at 21°C. The polished and coated compacted KCl may have one or more of the following release properties: a release of about 20% or less at 10 days; and / or a release of 40% or less at 30 days; and / or a release of 50% or less at 50 days.

The invention discloses a low-sodium myofibrillar protein flavor prediction method and a low-sodium myofibrillar protein flavor prediction device. The method comprises the following steps: firstly, constructing a protein-flavor interaction system containing myofibrillar protein, potassium chloride, kappa-carrageenan and representative aldehyde flavor compounds; then, by means of spectroscopy, rheometer combination, an electronic tongue and the like, protein conformational change, typical aldehyde molecule binding rate and taste features are represented in a multi-dimensional mode. And establishing a random forest prediction model, taking protein conformation parameters as input, and taking a flavor binding rate and effective taste intensity as output. The model can reveal cross correlation between protein conformations and functions and identify key conformation parameters that affect flavor. And in combination with quantification and prediction capabilities of the model, a conformation-flavor relationship can be systematically analyzed, a basis is provided for optimization of a low-sodium formula, flavor is enhanced while salty taste is increased and bitter taste is inhibited, and healthy and sustainable development of low-sodium meat products is promoted.

The invention provides a hydrogel fever cooling patch which comprises a hydrogel layer, a matrix layer and a hydrogel layer which are sequentially bonded from top to bottom, and the hydrogel layer is prepared from the following raw materials in percentage by weight: 0.5-3% of chondrus crispus (CHOWDRUS CRISPUS), 0.1-1% of potassium chloride, 0.1-1% of calcium chloride, 0.5-3% of a thickening agent, 5-30% of a humectant, 0.5-3% of a preservative, 0.4-0.8% of a pomelo sac extract and the balance of water. The sum of the weight percentages of the raw materials is 100%, and the sum of the weight percentages of the raw materials is 100%. The substrate layer is prepared from the following raw materials in percentage by weight: 1-10% of sodium polyacrylate, 0.01-0.5% of a chelating agent, 5-30% of a humectant, 0.1-1% of a cross-linking agent, 0.1-1% of a cross-linking regulator, 0.5-3% of a thickening agent, 0.5-3% of a preservative, 0.1-1% of thermochromic microcapsules and the balance of pure water, and the sum of the weight percentages of the raw materials is 100%. The invention further provides a preparation method of the hydrogel fever cooling patch. The hydrogel fever cooling patch provided by the invention has relatively good adhesiveness, stability, cooling performance and durability.

The invention relates to the field of tantalum powder mixed salt utilization, and discloses a method for recycling a byproduct fluorine-chlorine-sodium-potassium-containing mixed salt in tantalum powder production. The method comprises the following steps: (1) leaching fluorine, chlorine, sodium and potassium-containing mixed salt in the presence of a leaching agent to obtain a solid mixture A and a salt solution B; (2) sorting the solid mixture A obtained in the step (1) to obtain a tantalum pentoxide crude product and a sodium fluoride product; (3) reacting the salt solution B obtained in the step (1) with a composite fluorine removal agent to obtain a fluorine-containing solid and a salt solution C; and (4) crystallizing the salt solution C obtained in the step (3) to obtain a potassium chloride product and a salt solution D. The method can realize separation and recovery of valuable elements to the greatest extent.

The invention discloses an environment-friendly snow melting agent which is mainly prepared from the following raw materials in percentage by mass: 20-50% of potassium acetate, 10-16% of potassium chloride, 4-10% of calcium chloride and calcium acetate, 3-7% of magnesium chloride, 10-30% of an ice-resistant binder, 11-17% of a soil protective agent, 5-6% of cellulose and 3-9% of a plant protective agent. The ice-resistant binder is one or a combination of more of calcium acetate, magnesium acetate, potassium acetate and potassium formate, the mass ratio of calcium acetate to magnesium acetate is 3: (7.5-8.5), and the soil protective agent comprises 5-15% of diatomite and 10-20% of bentonite. Compared with the prior art, the environment-friendly snow melting agent disclosed by the invention can reduce the freezing point, prevent adhesion of an ice layer and a road surface and accelerate melting of an ice surface, so that a melted ice-snow-water mixture is easier to remove, effective recycling of resources is realized, pollution to the environment is reduced, and meanwhile, the treatment pressure of wastes is reduced.

To provide a method for simply and efficiently recovering potassium chloride from chlorine bypass dust recovered by a chlorine bypass device installed in cement clinker manufacturing equipment.SOLUTION: A method for recovering potassium chloride from chlorine bypass dust recovered from a chlorine bypass device installed in cement clinker manufacturing equipment, involves a mother liquor preparation process (S1) where the chlorine bypass dust is mixed with water to remove insoluble components to yield a mother liquor from which insoluble components have been removed, and a precipitate recovery process (S2) to evaporate moisture so that a portion of the mother liquor remains to recover precipitates that have crystallized in the remaining mother liquor.SELECTED DRAWING: Figure 1