20results about "Alkali metal halide formation shape" patented technology

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.

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 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.

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 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.

The application discloses a kind of based on fluidized bed's table salt drying and screening classification integrated device. Including box, the lower part of one side of box is equipped with the air inlet that is communicated with hot air fan, the top of box is open, the middle part in box is equipped with horizontal material plate, the both ends of the box above material plate are equipped with feeding port and discharge port respectively;The upper cover of box is equipped with lifting cover, the vertical partition that lifting cover is divided into two chambers is fixedly connected in lifting cover, the top of lifting cover in each chamber is equipped with the vertical lifting pipeline that is communicated with the chamber respectively, lifting pipeline is equipped with fixed pipeline, fixed pipeline is communicated with the inlet of cyclone separator, the outlet of cyclone separator is installed fan, the inner wall of the lower port of lifting cover and fixed pipeline is equipped with air seal ring;The outside of lifting cover is equipped with guide mechanism and lifting drive mechanism. The application separates different levels of powder salt and small particle salt by adjusting the height of lifting cover, and screening classification is carried out while drying.

A composition for use in brine formation comprising a deliquescent desiccant, urea, and an optional component selected from the group consisting of starch, citric acid, clay, glucose, and a combination thereof. Methods of making and using the composition are provided. The composition may be pressed into tablet form. The composition may be used in a dehumidifying device.

A zero-waste brine, treatment process, method and treatment facility for separating desired materials from recovered subsurface fluids into different groupings for categorization, collection, purification and monetization, generally. Specifically, the present invention is utilized to optimize the purification of non-potable, brine water and to the separation and purification of said water whereby specific mineral byproducts are extracted and resultant water undergoes a chlor-alkali process producing NaOH and HCI wherein, the NaOH may he further mixed with CO2 to produce Na2CO3, effectuating carbon capture, which may then be sequestered via utilization. This process may be applied to transported brine to a facility, the access point of a single operational or non-operational well and / or across a group of wells and or facilities, in the aggregate.

This invention relates to the field of roasted salt technology, specifically to a roasted salt with a multi-dimensional taste and its preparation method. Traditional roasted salt preparation methods not only easily result in clumping but also produce unsatisfactory flavor profiles and textures. To address these problems, this invention provides a roasted salt with a multi-dimensional taste. This salt formulation does not contain any exogenous substances such as anti-caking agents, flavor additives, or spices throughout the entire process. Instead, it achieves the problem at its source—by controlling the crystal structure—through physicochemical processes. The resulting roasted salt product is natural and pure, meeting consumers' basic requirements for food safety. Furthermore, the innovative process endows the product with a multi-dimensional taste and excellent anti-caking properties, aligning with current consumer demands for "clean label" and healthy food, and possessing promising market application prospects and promotional value.

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.

The invention provides a spherical potassium chloride crystal particle preparation method, which comprises: adding an octadecylamine hydrochloride solution to a potassium chloride solution at a temperature of 65-70 DEG C, mixing, and carrying out cooling crystallization to obtain a potassium chloride spherical crystal, the cooling crystallization is carried out in four steps, in the first step, the temperature is reduced from 70-65 DEG C to 64-54 DEG C, in the second step, the temperature is reduced from 64-54 DEG C to 54-39 DEG C, in the third step, the temperature is reduced from 54-39 DEG C to 39-25 DEG C, and in the fourth step, the temperature is reduced from 39-25 DEG C to 25-20 DEG C. The potassium chloride crystals obtained by the method are highly uniform in particle size, the particle size of the potassium chloride crystals is 20-40 meshes when the weight of the potassium chloride crystals is 89.2 wt% or above, the particle size of the potassium chloride crystals is 20-60 meshes when the weight of the potassium chloride crystals is 96.3 wt% or above, the purity reaches 99.9% or above, the dissolution rate is high, and the fluidity is good. The preparation method is simple and easy to realize, does not use any organic solvent, can realize industrialization and is low in economic investment.

The invention relates to the technical field of inorganic salt chemical industry, and provides an anti-caking sea crystal and a preparation method thereof. The preparation method comprises the following steps: S100, carrying out evaporative crystallization on concentrated brine to obtain salt crystals; s200, drying the salt crystals to obtain raw material salt; s300, screening the raw material salt to obtain fine powder salt; s400, the fine powder salt is subjected to coating treatment, and coated particles are obtained; and S500, carrying out post-treatment on the coated particles to obtain the anti-caking sea crystal. On the basis of crystallization, drying and screening, through the synergistic effect of intragranular porosity and a surface protection layer and in combination with water content and particle size control, fine powder recovery and surface anti-caking treatment, the moisture absorption and caking risks of the product in the storage and transportation process are effectively reduced while it is guaranteed that particles are rapidly disintegrated and dissolved when encountering water.

The application provides a resourceful treatment method of sodium chloride-containing waste and polyvinyl chloride waste, and belongs to the technical field of waste treatment. The resourceful treatment method comprises the following steps: mixing sodium chloride-containing waste, polyvinyl chloride waste, a promoter and a solid halogen agent, and performing calcination treatment to obtain calcined material; mixing the calcined material with water, and performing solid-liquid separation to obtain liquid material and solid material; the solid material is recovered promoter; and the liquid material is crystallized to obtain recovered sodium chloride. The resourceful treatment method can remove organic pollutants in the sodium chloride-containing waste, effectively fix the chlorine element in the polyvinyl chloride waste, prevent the chlorine element from escaping, and reduce the harm to the environment.