52results about "Alkali metal halide formation shape" patented technology

The invention discloses a continuous crystallization separation method for improving the recovery rate of sodium chloride and lithium chloride through mother liquor circulation. The method comprises the following steps: continuously feeding a raw material solution into a mixing tank to be mixed with a circulating solution, continuously feeding the mixed solution into a lithium chloride reaction crystallization device, feeding crystallized turbid liquid into a continuous centrifugal device from a crystallizer, carrying out solid-liquid separation, feeding a solid lithium carbonate product into a subsequent drying device, and carrying out vacuum drying at 30-40 DEG C for 5-6 hours, the method comprises the following steps: centrifugally separating a lithium-rich solution, performing evaporative crystallization and concentration on the centrifugally separated mother solution, feeding crystallized turbid liquid into a continuous centrifugal device from a crystallizer, performing solid-liquid separation, feeding a solid sodium chloride product into a subsequent drying device, performing vacuum drying for 5-6 hours at 30-40 DEG C, refluxing the concentrated lithium-rich solution into a mixing tank, and performing continuous recovery through mother solution circulation.

The invention relates to the technical field of sodium chloride preparation, in particular to a preparation method for increasing the particle size of sodium chloride crystals, which comprises the following steps: S1, discharging salt slurry generated by evaporation and crystallization of an original salt production evaporation tank into a particle size grading growth kettle through a salt leg, layering the salt slurry according to the particle size through a stirring mechanism, and adding a sodium chloride salt slurry solution into the particle size grading growth kettle, and the vacuum degree in the particle size grading growth kettle is controlled to be 70-90 kPa, the stirring speed of the stirring mechanism is controlled to be 20-50 rpm, and the temperature in the particle size grading growth kettle is controlled to be 80-85 DEG C. When the particle size grading growth kettle is used, the steps S1 and S2 are continuously circulated, in the crystallization process of crystals, fluid is subjected to evaporative crystallization in the particle size grading growth kettle, fine crystals are discharged from the top of the clarification area outside the baffle, and the fine crystals are discharged from the top of the clarification area outside the baffle. The sodium chloride crystal product prepared by the method is good in flowability, anti-caking, high in strength and not easy to break, and the problems of insufficient granularity and sphericity of the existing sodium chloride particle salt are avoided.

To provide a method for manufacturing a metal iodide tablet in which contamination of a black substance is suppressed.SOLUTION: A metal iodide tablet manufacturing method includes a process in which metal iodide powders are compression-molded by use of a tableting machine. The tableting machine comprises an upper pestle, a mortar and a lower pestle in this order, and has a cap, which prevents the metal iodide powders from falling into the mortar, on the upper pestle.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of edible salt production, and particularly relates to a method for producing edible salt and a recycling and energy-saving treatment device thereof.The device comprises a movable frame body, a filter set is arranged above a vertical frame, a crystallization assembly is arranged on one side of a thickener and comprises a tank body, a primary crystallization assembly is arranged in the tank body, and a secondary crystallization assembly is arranged in the tank body. A primary crystallization assembly is arranged in the annular cover, a material dredging assembly is arranged on the primary crystallization assembly, a feeding assembly is arranged on the material dredging assembly, a discharging assembly is arranged below the outer side of the material dredging assembly, a filtrate filtering assembly is arranged below the discharging assembly, and a separation assembly integrating a secondary crystallization function is arranged in the annular cover. The device is reasonable in design, simple in structure and convenient to process, concentrated crystallization treatment can be carried out on thickened waste liquid, secondary crystallization treatment can be continuously carried out on the waste liquid subjected to primary crystallization in equipment, the utilization rate of salt manufacturing waste liquid is increased, the production cost is saved, the working progress is improved, and the use requirements are met.

The invention discloses a control method and system for an edible salt evaporation unit. The control method comprises the steps that brine parameters in a first evaporation tank are obtained; setting execution parameters of three evaporation tanks according to the brine parameters; performing crystallization parameter acquisition on a first evaporation tank slurry discharge port, a second evaporation tank slurry discharge port and a third evaporation tank slurry discharge port at fixed time and fixed points, wherein the crystallization parameters at least comprise grain size, crystal form and grain size uniformity; and adjusting the execution parameters or flow of the downstream or the evaporation tank according to the crystallization parameters of the slurry discharge port of each evaporation tank. According to the control method, linkage adjustment of a plurality of evaporation tanks can be achieved, the adjustment is based on upstream real-time data, the reaction is rapid, the grain size and the grain size uniformity of table salt processed through the control method are controllable, the crystal form is well monitored, and table salt of various qualities can be produced conveniently.

A sodium fluoride hopper crystal formed by a method of manufacture comprising: dissolving a portion of NaF in water to form an NaF solution; forming an antisolvent solution; and adding the NaF solution into the antisolvent solution to precipitate NaF crystals out of the solution.

The invention relates to the technical field of salt preparation systems, in particular to a sodium chloride and sodium sulfate large-particle salt preparation system, which comprises a crystallization separation module, a sodium chloride and sodium sulfate large-particle salt preparation module and a sodium chloride and sodium sulfate large-particle salt preparation module, the fine crystal elimination and crystallization module comprises a crystal grading and growing kettle, a thickener and a centrifugal machine, a solution is evaporated and crystallized through the crystal separation module and conveyed to the fine crystal elimination and crystallization module, and the fine crystal elimination and crystallization module carries out grading and growing on the solution and forms crystals with different particle sizes; and the floating fine crystal is conveyed to the fine crystal eliminating and dissolving module again to carry out fine crystal dissolving on the unsaturated solution, the dissolved solution is conveyed to the fine crystal eliminating and crystallizing module again, and after the sinking particle crystal is thickened, centrifugal dewatering is carried out to form a crystal with a large crystal form particle size and a large crystal form particle size. And the crystal is round and regular in morphology, so that the crystal is good in flowability, anti-caking, high in strength and not easy to break, and industrial subsequent treatment is greatly reduced.

The present application relates to a method for improving the grade of potassium chloride in the process of preparing potassium chloride by using a vacuum crystallizer, comprising a potassium chloride crystallization step (S1), a fine potassium mother liquor is introduced into a DTB vacuum crystallizer for crystallization, part of small particle nuclei enter the circulating channel, are dissolved and then returned to the DTB vacuum crystallizer, and a slurry containing large particle nuclei is discharged to obtain a large particle crystal slurry; a screening step (S2), the large particle crystal slurry is screened by a first screening device to obtain a first screen oversize and a first screen undersize, a second screening device is used to screen the first screen undersize to obtain a second screen oversize and a second screen undersize; a large particle size nucleus treatment step (S3), the first screen oversize is dissolved with fresh water to obtain a targeted mother liquor, and the targeted mother liquor is returned to the circulating channel and then into the DTB vacuum crystallizer for continuous crystallization; and a small particle size nucleus treatment step (S4), the second screen undersize is returned to the inside of the DTB vacuum crystallizer for continuous crystallization. The present application can improve the grade of potassium chloride.

The invention relates to a method for producing potassium chloride granulates from a crystalline potassium chloride raw material. The potassium chloride raw material is treated, prior to granulation, with at least one alkali metal carbonate and at least one phosphate additive selected from alkali metal monophosphates, alkali metal pyrophosphates, linear alkali metal polyphosphates and mixtures thereof, in the presence of water. The invention also relates to potassium chloride granulates obtained according to the method.

The invention relates to the technical field of crystallization, in particular to a sodium bromide production device and method. The sodium bromide production device comprises a base, and the upper end face of the base is fixedly connected with a shell; the crystallization mechanism comprises a crystallization box fixedly connected to the upper half part in the shell, a cross-shaped partition plate is fixedly connected to the interior of the crystallization box, and the interior of the crystallization box is divided into a plurality of crystallization areas with the same volume by the cross-shaped partition plate; a vibration guide assembly, two resonance assemblies and a liquid level detector are arranged in each crystallization area, and the upper end face of the crystallization box is connected with a turning cover through a hinge; through a cross-shaped partition plate, a vibration guide assembly and a resonance assembly in the crystallization mechanism, sodium bromide to be crystallized in the crystallization box can be subjected to partition crystallization and uniform crystallization, and the vibration guide assembly can transmit vibration waves to a detector to master the crystallization condition, so that the crystallization uniformity and quality of the sodium bromide can be improved, and the crystallization efficiency is improved. And the uniformity and efficiency of the crystallization process are effectively improved.

The application provides a process and equipment for producing potassium chloride by using carnallite as raw material. The process of the application comprises the following steps: crushing, washing, grinding, crystallization and positive flotation. Through optimization of process parameters and process flow, the application realizes the industrial continuous production of potassium chloride from carnallite on a scale of million tons, and the production efficiency is high, and the quality of the potassium chloride product, such as purity, whiteness and crystal particle size, is obviously improved.

Provided herein are apparatus and methods for production of a chlorite salt, e.g., sodium chlorite, based on purification by recrystallization to achieve the desired purity.

This invention discloses a method for molding and demolding molten autumn ice salt, comprising the following steps: S1, high-temperature heating: solid salt frosting is placed into a crucible, filling it to 70%-90% of its volume, and then the crucible is fed into a high-temperature box furnace via an automatic feeding device for heating to 800-1000℃; S2, heat preservation treatment: the salt frosting is kept at 800-1000℃ for 1-4 hours; S3, cooling and molding: the crucible containing the molten salt frosting is moved to a cooling area, first cooled at a controlled rate using a circulating water cooler, and then exposed to an annular temperature for natural cooling, causing the molten salt frosting to solidify into salt blocks; S4, demolding assistance: the crucible is gently vibrated using a mechanical auxiliary device to help loosen the salt blocks from the crucible; S5, pouring and collecting: the molded salt blocks are automatically slid into a preset collection container under gravity. The beneficial effect of this invention is that the optimized cooling and demolding process facilitates rapid demolding of autumn ice salt.

The invention discloses an industrial by-product carnallite resourceful treatment process which comprises the following steps: S1, pretreating an industrial by-product to enable the industrial by-product to meet the feeding requirement of a pyrolyzing furnace; s2, in an anoxic, inert and weak reducing / oxidizing atmosphere, pyrolyzing to remove organic matters in the carnallite material; s3, mixing the carnallite treated in S2 with a solvent, fully dissolving to form carnallite mixed liquor, and performing solid-liquid separation to obtain filtrate and filter residues; adjusting the pH value of the filtrate to be neutral, evaporating and crystallizing to obtain high-purity sodium chloride, and circulating the residual water to a dissolving stage; dissolving filter residues by using water at 40-50 DEG C, and filtering to obtain a salt solution mainly containing sodium sulfate; sodium sulfate with relatively high purity is obtained after freezing crystallization. The industrial byproduct carnallite is subjected to four stages of pretreatment, pyrolysis, salt dissolving and evaporation freezing crystallization, the whole process of carnallite resourceful treatment is achieved, and the industrial byproduct carnallite resourceful treatment process with high efficiency and high purity is provided.

The invention discloses a crystallization method for separating lithium carbonate from a mixed mother solution of lithium chloride and sodium chloride through reaction, which comprises the following steps: evaporating and crystallizing a raw material solution for 2-4 hours at the concentration ratio of 4-5 times to obtain a turbid liquid containing sodium chloride crystals; feeding the crystallized turbid liquid into a continuous centrifugal device from the crystallizer, carrying out solid-liquid separation, washing and drying to obtain a sodium chloride product; adding the prepared saturated sodium carbonate solution into the filtered mother solution for reaction crystallization, continuously stirring in the reaction process, and continuously reacting after the operation is finished to completely react lithium chloride, so as to obtain a suspension containing lithium carbonate crystals; and filtering, washing and drying the reacted turbid liquid to obtain a lithium carbonate product. The filtered mother liquor is evaporated and concentrated by 5-8 times to obtain turbid liquid containing sodium chloride crystals, the crystallized turbid liquid enters a continuous centrifugal device from a crystallizer to be subjected to solid-liquid separation, washing and drying to obtain the sodium chloride crystals, and a liquid phase can be continuously subjected to a reaction crystallization step.

A sodium fluoride hopper crystal formed by a method of manufacture comprising: dissolving a portion of NaF in water to form an NaF solution; forming an antisolvent solution; and adding the NaF solution into the antisolvent solution to precipitate NaF crystals out of the solution.

The present disclosure relates to chemical treatments for preparing metal electrodes, including ex-situ chemical treatments for preparing metal electrodes and to ex-situ chemically treated metal electrodes, which can be used in electrochemical cells. The present disclosure also relates to methods for forming a metal fluoride-based layer (e.g. a SEI fluoride layer) on a metal or an electrode thereof comprising an ex-situ chemical treatment of the metal or electrode thereof, and to electrochemical cells comprising the ex-situ chemically treated metal electrodes.

The utility model discloses an industrial waste salt treatment system which comprises a microwave pyrolysis unit which is used for pyrolyzing organic matters in industrial waste salt and is provided with a tail gas outlet and a discharge hole; the tail gas treatment unit is connected to the tail gas outlet and is used for treating and discharging the tail gas; the salt dissolving, impurity removing and degassing unit comprises a salt dissolving pond, one end of the salt dissolving pond is connected with the discharging port, the other end of the salt dissolving pond is connected with an impurity removing device, and the salt dissolving pond is connected with a degassing device; the lithium recovery unit is used for lithium precipitation reaction and is connected with the impurity removal device; the membrane separation unit comprises a hardness removal softening device and a nanofiltration separation membrane device which are connected in sequence, the nanofiltration separation membrane device comprises a produced water outlet and a concentrated water outlet, the produced water outlet is connected with a sodium chloride generation module, the concentrated water outlet is connected with a sodium sulfate generation module, and the hardness removal softening device is connected with the lithium recovery unit. According to the utility model, harmless and resourceful treatment on the industrial waste salt generated in the lithium battery recycling process is realized.

The invention relates to the technical field of waste resource recovery, in particular to a vacuum carbothermic method for ferrochrome smelting dust collection ash, which comprises the following steps of: fully and uniformly mixing the ferrochrome dust collection ash and a carbonaceous reducing agent according to the mass ratio of 1: (0.05-0.5), and pressing into pellets; the pellets are placed in the environment with the temperature ranging from 850 DEG C to 1050 DEG C and the pressure intensity ranging from 5 Pa to 150 Pa, vacuum carbonization reduction reaction is carried out for 60 min to 180 min, and the product zinc and reducing slag are obtained; the method comprises the following steps: crushing and grinding the reducing slag, adding water for size mixing, carrying out solid-liquid separation to obtain iron-containing slag and a high-salt solution, carrying out magnetic separation treatment on the iron-containing slag to obtain magnetic slag and non-magnetic slag, returning the magnetic slag to a furnace for circulation, taking the non-magnetic slag as a raw material of a cement plant, carrying out evaporative crystallization on the high-salt solution to obtain NaCl, KCl and an evaporation mother solution, and carrying out solid-liquid separation on the evaporation mother solution, and returning the evaporation mother liquor to the reducing slag for size mixing. According to the method, the Cr < 6 + > leaching risk can be effectively eliminated, and valuable elements are efficiently recycled.

The invention relates to the technical field of chlor-alkali industry, and discloses a potassium chloride purification production process, which comprises: dissolving industrial grade potassium chloride in water to form a uniform potassium chloride solution; carrying out segmented acid adjustment treatment on the obtained potassium chloride solution so as to remove soluble impurity ions contained in the solution; adding a nucleation regulator into the potassium chloride solution subjected to acid regulation and purification, and inducing crystallization under a control condition to generate crystal mush; evaporating and concentrating the crystal mush; carrying out centrifugal separation on the concentrated crystal mush to obtain potassium chloride crystals and mother liquor; drying the obtained potassium chloride crystal to remove residual water on the surface and in the potassium chloride crystal; and screening and grading the dried potassium chloride crystals, and sealing and packaging to obtain the potassium chloride product meeting the medicinal grade standard. The preparation of high-purity, uniform-particle and low-impurity medicinal potassium chloride is realized through synergistic impurity precipitation, concentration crystal control and nucleation adjustment.

This invention discloses a production process for potassium chloride using carnallite as raw material. The process includes a crystallization unit and a flotation unit. First, pretreated carnallite is transported to the crystallization unit. The flotation unit includes a direct flotation unit and a reverse flotation unit. This process improves the yield and purity of potassium chloride products and avoids the drawbacks of existing single direct or reverse flotation processes requiring multiple (at least three) flotation operations. Furthermore, it reduces the washing steps after flotation while maintaining high purity, simplifying the experimental procedures, reducing energy consumption, and avoiding the reduction in potassium chloride crystal particle size caused by washing operations.

To provide a novel high aspect-ratio water-soluble salt suitable as a spacer material added to a raw material for sintered body when manufacturing a grind stone used for cutting or polishing a carbon fiber plastic (CFRP) or the like and its manufacturing method.SOLUTION: Provided is a high aspect ratio water-soluble salt having an aspect ratio of 2 or more. A manufacturing method of a high aspect ratio water-soluble salt comprises a step of adding an aqueous solution of a water-soluble salt of 5 to 350 g / l to a single-layer or multi-layer carbon nanotube and stirring to prepare an aqueous gel, and a step of precipitating the high aspect ratio water-soluble salt from the aqueous gel.SELECTED DRAWING: None

The invention relates to a method for producing potassium chloride granular materials from a crystalline potassium chloride raw material, wherein, before the granulation process, the potassium chloride raw material is treated with at least one alkali metal carbonate and at least one metaphosphate additive in the presence of water. The invention further relates to the potassium chloride granular materials that can be obtained according to the method.

The present invention relates to a waste salt resource utilization system and method based on integrated energy conservation and environmental protection for thermal power plants. The system comprises: a dryer A, a dust removal and deacidification device B, a vacuum device C, a liquid-liquid heat exchanger D, a solid-liquid heat exchanger E, a high-temperature pyrolyzer F, a negative pressure fan G, a dust removal and deacidification device H, a dissolution tank K, a coagulation and sedimentation tank J, a filter press I, a seed crystallization device O, a regulating tank S, an oxidizer T, a regulating tank U, a freeze crystallization device R, a re-dissolution tank N, an evaporative crystallizer M, a steam ejector X, an evaporative crystallizer Q, a desorption device L, an adsorption device P, a freezing device V, an evaporative crystallizer W, and an induced draft fan Z. The present invention can achieve harmless and resourceful disposal of industrially produced hazardous waste salt based on a thermal process that utilizes energy cascades and recovers waste heat, eliminates secondary pollution such as associated dioxins and hazardous waste smoke, and significantly reduces the effective operating energy consumption and hazardous waste salt disposal costs.

The invention provides a preparation method of large-particle sodium fluoride, relates to the technical field of preparation of large-particle sodium fluoride, and aims to solve the problems that powder sodium fluoride with small particle size is easy to generate, large-particle sodium fluoride is difficult to obtain, a reaction kettle is seriously corroded by reaction, the requirement on equipment materials is very high and the production cost is relatively high in the traditional method. The method comprises the following steps: a, adding 1000kg of high-purity water into a reaction kettle, and stirring at 18-20r / min, b, controlling the synthesis proportion by reasonably regulating and controlling the liquid inlet flow, the hydrofluoric acid metering tank at 200-400m < 3 > / h and the sodium hydroxide metering tank at 800-1600m < 3 > / h, and c, adding 1100kg of hydrofluoric acid with the content of 50% and 5200kg of sodium hydroxide with the content of 30% into the reaction kettle in a convection manner.

The application provides a method for producing potassium chloride by mixing halogen and cold crystallization. The method mixes raw material E halogen and raw material F halogen, and then adds circulating seeds to perform primary halogen mixing to obtain primary halogen mixing slurry. The primary halogen mixing slurry is sequentially concentrated and centrifuged to obtain semi-finished product mother liquor and carnallite. The carnallite is crystallized and dried to obtain potassium chloride. The semi-finished product mother liquor is concentrated and mixed with primary halogen completion liquid, raw material F halogen, fine crystal carnallite mother liquor and circulating seeds to perform secondary halogen mixing. The raw material F halogen, the raw material E halogen and the circulating seeds can be self-made by artificial method. The method can improve the yield of potassium chloride, increase the diversity of halogen water raw material sources, greatly reduce the cost, and the overall potassium chloride recovery rate of the process can reach more than 75%.

The present application belongs to the technical field of edible salt production, and particularly relates to a method for producing edible salt and a recovery and energy-saving treatment device thereof, comprising a movable frame, a filter group is arranged above the frame, a thickener is arranged on one side of the frame, the thickener comprises a tank, a primary crystallization assembly is arranged in the tank, a material loosening assembly is arranged on the primary crystallization assembly, a feeding assembly is arranged on the material loosening assembly, a discharging assembly is arranged below the outer side of the material loosening assembly, a filtrate filtering assembly is arranged below the discharging assembly, and a separation assembly with a secondary crystallization function is arranged in the ring cover. The present application has the advantages of reasonable design, simple structure, convenient processing, concentrated crystallization treatment of thickened waste liquid, secondary crystallization treatment of the waste liquid after primary crystallization in the equipment, improved utilization rate of salt production waste liquid, saved production cost, improved work progress, and satisfied use requirement.

The invention discloses a high-stability sodium percarbonate-based composite sodium sulfate-sodium chloride eutectic solid and a preparation method and application thereof.The preparation method comprises the steps that firstly, wet sodium percarbonate is added into a solid-phase reactor, then sodium chloride and anhydrous sodium sulfate are added according to a certain proportion, meanwhile, a hydrogen peroxide solution is slowly added, and after adding is completed, the mixture is stirred to be uniform; continuously carrying out heat-preservation reaction for a period of time to promote crystallization; and after the reaction is finished, carrying out solid-liquid separation on the obtained slurry, and drying the obtained filter cake to obtain the composite solid product. According to the invention, by optimizing the molar ratio and accurately controlling the reaction temperature and the feeding rate, the product with high active oxygen content (greater than 13.0%), good thermal stability, good fluidity and low decomposition rate in the storage process is successfully prepared. The product perfectly solves the problem of poor stability of traditional sodium percarbonate, can be used in multiple fields of bleaching, disinfection, sewage treatment, aquaculture oxygenation and bottom improvement and the like, and has a wide industrial production prospect.

The present application relates to waste resource recycling technical field, and specifically to a kind of ferrochrome smelting dust vacuum carbon thermal method, comprising the following steps: ferrochrome dust and carbonaceous reducing agent are mixed uniformly according to mass ratio 1:0.05~0.5 after being pressed into pellet;Pellet is placed in the environment with temperature 850 ℃~1050 ℃, pressure 5Pa~150Pa, and vacuum carbonization reduction reaction is carried out for 60min~180min, and product zinc and reduction slag are obtained;Reduction slag is crushed and ground, then water is added to slurry, and solid-liquid separation is carried out to obtain iron-containing slag and high-salt solution, iron-containing slag is treated by magnetic separation to obtain magnetic slag and non-magnetic slag, magnetic slag is recycled again, non-magnetic slag is used as cement plant raw material, high-salt solution is evaporated to obtain NaCl and KCl and evaporation mother liquor, and evaporation mother liquor is returned to reduction slag slurry again.The present application can effectively eliminate Cr 6+ leaching risk, and valuable elements are recycled efficiently.