54 results about "Carnallite" patented technology

The invention discloses a controlled-release potassium-magnesium fertilizer as well as a preparation method and application thereof, and relates to the technical field of controlled-release fertilizer production. Potassium magnesium crude salt recovered through salt lake carnallite flotation crystallization is used as a core raw material, high-roundness modified potassium magnesium salt composite particles are constructed through extrusion master batch forming, roller wet amplification, centrifugal polishing shaping and micropore filling and sealing, and the controlled-release potassium magnesium fertilizer is prepared through coating. The problems that potash fertilizer particles prepared through traditional extrusion granulation have many edges and corners and are not prone to film coating are solved through a multi-stage granulation process, secondary granulation is conducted through heterogeneous fine powder materials, surface micropores are filled, the surface smoothness of the particles is greatly improved, meanwhile, the influence of potassium ions on film forming is isolated, and the potassium fertilizer has the good application prospect. According to the finally prepared controlled-release potassium-magnesium fertilizer, a nutrient release curve is precisely regulated and controlled through the controlled-release film layer, double-nutrient continuous supply of crops with high potassium and high magnesium requirements is achieved, the potassium and magnesium deficiency symptoms of the crops are reduced, the crop quality is improved, and a core technical support is provided for high-value utilization of salt lake potassium ore resources and green quality improvement of the crops.

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 invention discloses a low-temperature dehydration method of hydrous magnesium chloride and anhydrous magnesium chloride, comprising the following steps: contacting hydrous magnesium chloride with ammonium chloride to obtain a mixed dehydrated raw material; and heating the mixed dehydrated raw material, and keeping the temperature for a certain time after the mixed dehydrated raw material reaches a set temperature until water in the water-containing magnesium chloride is removed. The invention also provides the anhydrous magnesium chloride prepared by the method. According to the method, synthesis of carnallite is not needed, hydrogen chloride protective gas is not needed, dehydration can be achieved through independent ammonium chloride, equipment is hardly corroded, the operation environment is good, and anhydrous magnesium chloride is prepared under the mild condition.

The invention discloses a method for purifying carnallite, purified carnallite and application of the purified carnallite. The method comprises the following steps: uniformly mixing sodium-containing carnallite, old brine and water to form a mixed system, wherein the mass ratio of the sodium-containing carnallite to the old brine to the water in the mixed system is 1: (3.56-6.15): (0-0.28); heating the mixed system to completely dissolve potassium in the sodium-containing carnallite in a liquid phase to obtain a mixed solution; carrying out solid-liquid separation on the mixed solution to obtain a carnallite saturated solution; and adding water into the carnallite saturated solution to separate out crystals, thereby obtaining the purified carnallite. According to the method provided by the invention, the carnallite is dissolved by using the old brine under a high-temperature condition to obtain a carnallite saturated liquid phase, and the carnallite can be separated out by cooling and crystallizing, so that the content of sodium chloride in the carnallite can be effectively reduced.

The invention relates to the technical field of nickel-containing dangerous and solid waste recycling, and discloses a complex nickel-containing waste smelting flue gas cleaning and comprehensive utilization method which comprises the steps that smelting flue gas is fed into a dry-method deacidification tower after being subjected to waste heat recovery and shock cooling, coarse-particle calcium hydroxide is sprayed into the dry-method deacidification tower, defluorination is preferentially carried out in a first temperature interval of the dry-method deacidification tower, and defluorination is carried out in a second temperature interval of the dry-method deacidification tower; a defluorination product is collected, and fluorine-containing dust is separated and collected through electrostatic dust collection; the dedusted flue gas enters a semi-dry deacidification tower, and fine-particle calcium hydroxide is sprayed into the semi-dry deacidification tower for deep dechlorination in a lower second temperature interval of the semi-dry deacidification tower; and discharging the purified gas after denitration, washing and ionic liquid desulfurization. The defluorination product is washed and purified to prepare hydrofluoric acid, and the dechlorination slag is dissolved and subjected to a double decomposition reaction to prepare hydrochloric acid. According to the method, a temperature gradient and absorbent particle size gradient coupling process is utilized, so that directional separation and enrichment of gas-phase fluorine and chlorine pollutants are effectively realized, the problem that carnallite is difficult to utilize is solved, and full-process recycling and ultralow emission are realized.

The utility model belongs to the technical field of comprehensive utilization of waste salt, and particularly relates to a sodium bicarbonate preparation device and a carbonation tower comprising the sodium bicarbonate preparation device, the preparation device comprises a reaction tower, and the reaction tower comprises a reaction tower base, a gas inlet area, a cooling area, a mushroom cap, an acidification area and a tower cover from bottom to top in the vertical direction. The utility model is improved on the basis of a Solvay carbonation tower, and provides a recycling device capable of continuously and efficiently producing sodium bicarbonate and a downstream product sodium carbonate by reacting sodium sulfate, sodium chloride or carnallite with waste ammonia gas and waste carbon dioxide through chemical conversion by referring to the thought of the soda industry field.

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.

The invention discloses a nanofluid oil-displacing agent based on solid carnallite and a preparation method of the nanofluid oil-displacing agent. The method comprises the following steps: by taking oil and gas field wastewater treatment solid carnallite rich in calcium and magnesium ions as a raw material, firstly, preparing the raw material into an aqueous solution, reacting with a betaine surfactant and alkyl sulfate salt in a foam system at a specific temperature, adjusting the pH value by sodium hydroxide and sodium carbonate, standing, centrifuging and drying, thereby obtaining the calcium and magnesium ion-rich solid carnallite. The salt-resistant calcium carbonate / magnesium hydroxide composite nanoparticles are obtained; and then dispersing the nano-particles in a polyacrylic acid polymer aqueous solution, and performing ultrasonic treatment to obtain the target nano-fluid oil-displacing agent. According to the invention, industrial solid carnallite is ingeniously converted into a functional nano material, and the prepared oil-displacing agent has excellent stability and interfacial activity, and can significantly improve the crude oil recovery rate when being used for high-water-content oil reservoirs. The method not only provides a new low-cost and high-performance oil-displacing agent selection for efficient development of an oil field, but also realizes recycling and high-value utilization of the solid waste salt, and has remarkable economic and environmental benefits.

The invention discloses a preparation method of a hydraulic cementing material for synergistically recycling coal gangue and mine water concentrated carnallite. According to the method, mine water carnallite, coal gangue, kaolin, calcium oxide and water are taken as main raw materials, firstly, metakaolin with potential activity is obtained by calcining the kaolin, then the proportion of the mine water carnallite, the metakaolin, the calcium oxide and the water is optimized by adopting an orthogonal experiment method, and the hydraulic cementing material with good mechanical properties is prepared. And an optimal ratio is determined through a compressive strength test. And then coal gangue is introduced as aggregate, so that the overall structural stability and compressive property of the material are further improved. According to the method, sulfate radicals in the mine water carnallite react with calcium oxide to generate stable hydration products such as ettringite, the gelling performance is improved, resource utilization of coal gangue is achieved, and a stable curing system is formed. The method has good hydraulicity, environmental adaptability and solid waste co-processing potential, and is suitable for the fields of industrial solid waste resource utilization and green cementing material development.

The invention provides a seawater concentrated water resource regeneration treatment method based on plate nanofiltration, which comprises the following steps of: after concentrated seawater is subjected to plate nanofiltration, settling and separating the concentrated water to obtain gypsum, and extracting the gypsum to obtain mother liquor; the mother liquor after gypsum extraction is subjected to bromine extraction to obtain a bromine product and mother liquor after bromine extraction, the mother liquor after bromine extraction is adjusted to be neutral and subjected to multiple-effect evaporation to obtain condensate water and evaporation mother liquor, the former is partially fed into an external coil pipe of a reaction settler for heat exchange, and the latter is subjected to heat preservation and sedimentation to obtain high-temperature salt slurry and clarified liquor; separating high-temperature salt slurry to obtain magnesium milk and sodium chloride, processing the magnesium milk into a magnesium sulfate monohydrate product, washing the sodium chloride to obtain bitter salt, and feeding part of the bitter salt into concentrated seawater; cooling and crystallizing the clarified liquor to obtain carnallite and mother liquor after carnallite is separated out, washing the carnallite to obtain a potassium chloride product and decomposition washing mother liquor, mixing one part of the two mother liquor with the mother liquor after bromine extraction, feeding the other part of the two mother liquor, condensate water and bitter salt into a magnesium preparation mother liquor pool, and adding caustic soda to obtain a magnesium hydroxide product. According to the method, valuable components in the concentrated seawater can be subjected to resource maximization extraction.

The utility model relates to the technical field of fly ash recycling, and discloses fly ash salt separation pilot plant test equipment which comprises a fly ash pretreatment system, an evaporation system and a salt outlet system which are connected in sequence, wherein the fly ash pretreatment system is used for carrying out water washing and hardness removal treatment on fly ash, and the evaporation system is used for carrying out evaporative crystallization on pretreated water washing liquid; the salt outlet system comprises a thickener, a first centrifugal unit, a freezing unit, a second centrifugal unit and a spray drying unit which are connected in sequence; and the salt discharging system is used for performing salt separation treatment to obtain first crystal salt, second crystal salt and carnallite. The fly ash pretreatment system is used for carrying out water washing and hardness removal treatment on fly ash, the evaporation system is used for carrying out evaporative crystallization on pretreated water washing liquid, and the salt outlet system is used for carrying out solid-liquid separation on a crystal slurry mixture, so that the fly ash salt separation pilot plant test equipment is provided, industrial salt in the fly ash is recycled, and the production cost is reduced. And reduction, harmlessness and recycling of fly ash treatment are realized.

The present application discloses a method for the co-production of lithium and potassium in magnesium sulfate salt lakes, and relates to the technical field of potassium and lithium extraction from salt lakes. The method comprises the following steps: naturally evaporating the brine of the magnesium sulfate salt lake until it is saturated with potassium chloride, separating the solid salt, mixing the remaining brine with lithium extraction brine, naturally evaporating the brine, separating the solid salt, obtaining old brine, and subjecting the old brine to a lithium extraction process to obtain a lithium salt product and a lithium extraction tail brine A. The present application returns the lithium extraction brine, which is mainly composed of magnesium chloride and is produced during the lithium salt production process, to the salt field and mixes it with potassium chloride saturated brine, thereby changing the precipitation path of the potassium salt ore and skipping the precipitation stage of soft potassium magnesium sulfate. This increases the yield of potassium salt and carnallite salt, while preventing the lithium in the brine from precipitating as lithium sulfate ore in the carnallite salt pool, thereby increasing the lithium salt yield. The method is characterized by simple operation, high efficiency, and readily available raw materials, and has practical significance for increasing the yield of potassium and lithium in the process of salt lake resource development.

The present invention discloses a method for extracting potassium sulfate and magnesium fertilizer by evaporating and converting bittern from seawater. The bittern from seawater is mixed with conversion mother liquor and then added into an evaporator for evaporation and salt precipitation. The material discharged from the evaporator is then subjected to solid-liquid separation to obtain mixed salt I and liquid phase old brine. The mixed salt I is separated to remove at least part of NaCl in the mixed salt I to obtain mixed salt II. Water is then added to the mixed salt II, and MgCl2 and / or MgSO4 and / or carnallite Car are added, and then mixed and converted. The converted liquid is subjected to solid-liquid separation to obtain a solid phase of crude potassium magnesium alum Leo, which is washed and dried to obtain a potassium sulfate and magnesium fertilizer product. The present invention targets the bittern components from seawater, obtains mixed salt by high-temperature evaporation, and converts the mixed salt into potassium sulfate and magnesium fertilizer at low temperature by adding water. The present invention realizes the comprehensive utilization of bittern from seawater, and the K in the bittern is used as the raw material. + and SO4 2‑ The recovery rates were all above 80%.

The invention belongs to the technical field of sewage treatment, and particularly relates to a process method for resource utilization of deep coal bed gas produced wastewater evaporation mother liquor. The method comprises the following steps: adjusting the pH value to remove Mg < 2 + > in the mother liquor, filtering the precipitate, further evaporating and concentrating the evaporated mother liquor, centrifuging and separating salt after evaporating to a certain degree, carrying out heat preservation strontium separation on the mother liquor obtained after salt separation, then centrifuging and separating salt to obtain strontium separation mother liquor and strontium-rich carnallite, further evaporating and concentrating the strontium separation mother liquor to obtain the product calcium chloride, and adding water into the strontium-rich carnallite for further treatment and purification to obtain industrial-grade strontium carbonate. According to the method, the coal bed gas produced wastewater is evaporated and concentrated into the mother liquor, the produced wastewater is recycled through a simple process, qualified strontium carbonate products and calcium chloride products are obtained, and resource utilization of the deep coal bed gas produced wastewater is achieved.

This invention provides a static cone penetration test (CPPT) system and method for measuring the thickness of carnallite ore layers based on an unmanned surface vessel (USV) with variable buoyancy anchoring. The system includes an USV body, a penetration unit, a main control unit, a data acquisition unit, a multi-parameter formation identification unit, and a fluid counterweight anchoring unit. When the USV body is not performing detection operations, the fluid counterweight anchoring unit increases the weight of the hull. As the static cone penetration probe penetrates the formation, it collects the end resistance at the probe tip and the frictional force on the probe sidewall sleeve, transmitting these data to the multi-parameter formation identification unit. The identification unit identifies the upper and lower interfaces of the carnallite ore layer. The control unit calculates the carnallite ore thickness based on the depth difference between the static cone penetration probes at the upper and lower interfaces of the carnallite ore layer. This invention improves measurement accuracy, resolves the contradiction between miniaturization and large reaction forces, does not damage the original crystallization environment of the salt lake, and enhances the safety of unmanned operations.

The embodiment of the invention discloses an iodine removal process for carnallite. The process comprises the following steps: dissolving sodium chloride carnallite in water, and filtering to remove insoluble substances to obtain filtrate; adding sodium hydroxide into the filtrate, adjusting the pH value to be alkaline, and removing heavy metals, calcium and magnesium through adsorption to obtain an adsorbed feed liquid; adding hydrochloric acid into the adsorbed feed liquid, and adjusting the pH to be acidic to obtain an acidic solution; carrying out oxidation treatment on the acid solution by adopting an advanced oxidation technology to obtain an oxidized solution; and adding modified activated carbon into the oxidized solution, stirring, carrying out solid-liquid separation, and collecting a liquid phase. The method provided by the invention can effectively remove iodine in sodium chloride carnallite, does not introduce new impurities, prolongs the service life of the ionic membrane, and has good application value.

This patent application refers to a global process to obtain lithium sulfate monohydrate ore with low contents of impurities associated to chlorine and magnesium; in particular, the process consists of the concentration, through grinding, flotation, leaching and filtration stages, of the lithium sulfate present in potassium Carnallite (KCl*MgCl2*6H2O) stockpiles with high contents of lithium sulfate (Li2SO4*H2O) and sodium chloride (NaCl). The greatest advantage of the invention's process is that it uses salts and brines which are not currently being processed today and which have already been extracted far potassium production.

The invention discloses a carnallite cold decomposition process water adding amount control method, a carnallite cold decomposition process water adding amount control device and electronic equipment. The method comprises the steps that in the carnallite cold decomposition process, current basic physical property parameters of overflow liquid of a cold decomposition crystallizer are collected; on the basis of the current basic physical property parameters, the current ion concentration in the overflow liquid is predicted, and the current ion concentration comprises the sodium chloride concentration, the potassium chloride concentration and the magnesium chloride concentration; according to the current ion concentration, the target water adding amount in the carnallite cold decomposition process is determined; the opening degree of a water injection valve is controlled based on the target water adding amount, water is injected into decomposition liquid, and the decomposition liquid is mixed liquid generated after carnallite reacts with water or other solutions in the carnallite cold decomposition process. The technical problem that in the prior art, the water adding amount is difficult to accurately control in the carnallite cold decomposition process, and then the potassium salt yield and the decomposition efficiency are affected is solved.

The invention discloses a method and a system for producing potassium chloride from sylvite ore. The method comprises the following steps: S1, crushing the sylvite ore into ore particles with the particle size of less than or equal to 5mm and greater than or equal to 1mm; s2, conveying the ore particles into a decomposition and crystallization unit, and performing decomposition and crystallization to obtain crystallization underflow slurry and crystallization overflow; s3, the crystallizer underflow slurry is screened and classified, screen underflow and the crystallization overflow are conveyed to a thickening unit to be subjected to thickening treatment, and thick underflow is obtained; and S4, the dense underflow is conveyed into a reverse flotation unit for reverse flotation. According to the method, explosion nucleation of carnallite is avoided in the mineral decomposition process, fine grain loss is reduced, and the growth yield of potassium chloride is increased; meanwhile, a reverse flotation process is adopted, KCl crystal particles grow for a long time in a flotation device and can continuously grow in a supersaturated solution, and the yield and the taste of products are improved.

This invention provides a prospecting method for halite-type carnallite, comprising the following steps: 1) Locating the center of potassium salt accumulation through lithofacies paleogeography, mineralogy, and petrology analysis; 2) Analyzing the characteristics of carnallite on well logging curves through geophysical logging and comparison with actual rock cores, summarizing the well logging response characteristics that differ from other lithologies, and establishing a well logging identification model; 3) Utilizing 3D seismic data, obtaining the tectonic deformation and potassium-bearing salt layer distribution characteristics through well-seismic calibration and forward and inverse tectonic evolution analysis; then, based on rock physics testing, seismic attribute analysis, and forward modeling methods; and finally, establishing a seismic inversion framework model under complex tectonic deformation conditions to determine the distribution characteristics of carnallite-bearing salt layers. This invention is rationally conceived and can determine the distribution range of ore bodies through multi-hole logging, 3D seismic analysis, and multiple methods including mineralogy, sedimentology, and geochemistry.

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.

The invention relates to a process for extracting high-purity potassium chloride (KCl) from a carnallite ore (KCl.MgCl2.6H2O) associated with halite (NaCl). The process starts with selective dissolution, prioritising KCl and MgCl2, due to the addition of water at room temperature. Two basification steps follow, involving the addition of potassium hydroxide (KOH) to the solution obtained after dissolving the ore. The first addition makes it possible to extract all of the Mg2+ ions in the form of magnesium hydroxide (Mg(OH)2), an upgraded product. The second addition of KOH seeks to convert all the NaCl into potassium chloride (KCl) and sodium hydroxide (NaOH). This second addition of KOH is carried out in excess to promote the formation of the desired products during the following two crystallisation steps. After the chemical transformations of the mineral solution, a concentration step is undertaken to vaporise the water, thereby promoting the crystallisation of the potassium chloride (KCl). A second concentration is followed by cooling in order to form the solid sodium hydroxide (NaOH). The water vapours generated in the two concentration steps are liquefied by cooling to be recycled. The three solid products resulting from the process are dried to remove moisture, thereby complying with market requirements in terms of purity. The proposed process is characterised by zero-waste management and low water consumption, with more than 90% of the water being recycled initially, as well as recycling of the KOH at the end of the process. In addition, it has low energy requirements, since the dissolution of KOH is exothermic. The KCl production of the process is high due to the regeneration of KCl during the chemical transformations, and the process is characterised by its flexibility with respect to different compositions of the starting ore.

The invention discloses an industrial miscellaneous salt total-amount treatment device and method, and belongs to the technical field of energy utilization. The device comprises a dissolving device, a filtering device, a TOC removal device, a denitrification device, a hardness removal device, a freezing device, a separation device A, an evaporation device, a separation device B, a purification device A, a purification device B and a curing device. Industrial carnallite and water are fed into the dissolving device to be dissolved, the dissolved carnallite solution is sequentially fed into the filtering device, the TOC removal device, the denitrification device and the hardness removal device to be filtered, TOC removal, denitrification and hardness ion and heavy metal ion removal are conducted, the carnallite solution obtained after pretreatment is completed is fed into the freezing device and the separation device A, and sodium sulfate is recycled; the carnallite solution after sodium sulfate recovery is fed into an evaporation device and a separation device B to recover sodium chloride, and then the collected sodium sulfate and sodium chloride are purified through a purification device A and a purification device B respectively. The carnallite solution is fed into a curing device for curing after being subjected to resource recovery, so that full-amount treatment of industrial carnallite is realized.

This patent application refers to a process to obtain lithium sulfate monohydrate ore with low contents of impurities associated to chlorine and magnesium; in particular, the process consists of the concentration, through grinding, flotation, and filtration stages, of the lithium sulfate present in potassium Carnallite (KCl*MgCl2*6H20) stockpiles with high contents of lithium sulfate (Li2S04*H20) and sodium chloride (NaCl).

A production process for producing potassium chloride from carnallite ore containing potassium rock includes: crushing the raw ore; adding water (TDS / mg / L < 45000), potassium-containing mother liquor, and blending mother liquor for crystallization; performing a primary screening of the crystallization underflow, with the oversize S1 sent to the secondary crystallization stage and the undersize slurry undergoing primary thickening; conveying the primary thickened underflow to a flotation conditioning tank; adding water (TDS / mg / L < 45000), flotation mother liquor, and blending mother liquor to the secondary crystallization stage; performing a secondary screening of the secondary crystallization underflow, with the oversize S2 sent to grinding and the undersize slurry undergoing secondary thickening; conveying the secondary thickened underflow to a flotation conditioning tank; conveying the ground discharge to a flotation conditioning tank; obtaining concentrate K1 and tailings T1 through flotation; washing the concentrate K1 with fresh water and conditioning mother liquor, followed by solid-liquid separation to obtain the potassium chloride product. This invention features a simple process and high product yield.

The invention provides a method for enriching lithium and rubidium from high-magnesium salt lake brine. The method comprises the following steps: evaporating the high-magnesium salt lake brine until the high-magnesium salt lake brine is close to or reaches a state that carnallite is saturated and no carnallite is separated out, stopping evaporation, and separating to obtain a first solid and a first liquid; the first liquid is at least subjected to nanofiltration treatment, at least part of divalent ions in the first liquid are removed, the divalent ions comprise magnesium ions, and first concentrated water and first produced water are obtained; performing evaporation, concentration and crystallization on the first produced water to separate out sodium and potassium in the first produced water in a salt form, increasing the concentration of rubidium and lithium, stopping evaporation when a preset rubidium concentration and / or a preset lithium concentration are / is reached, and performing solid-liquid separation to obtain a second solid and a second liquid; and adsorbing and separating rubidium in the second liquid to obtain a lithium-rich third liquid so as to realize separation of lithium and rubidium. The method provided by the invention can realize high yield, low cost and simultaneous enrichment of rubidium and lithium.

The application provides a method for improving utilization of a halogen replacement completion liquid. The method for improving utilization of the halogen replacement completion liquid comprises: performing first halogen replacement on E halogen and first F halogen to obtain first halogen replacement completion liquid and first carnallite; and performing second halogen replacement on the first halogen replacement completion liquid and second F halogen to obtain second halogen replacement completion liquid and second carnallite. Compared with a traditional method of directly discharging and treating the halogen replacement completion liquid as waste liquid, the first halogen replacement completion liquid obtained in a halogen replacement-cold crystallization method is subjected to second halogen replacement with fresh second F halogen, so that potassium chloride in the first halogen replacement completion liquid is separated out, the utilization of the first halogen replacement completion liquid is improved through recycling, and the potassium chloride in the first halogen replacement completion liquid is recovered, thereby reducing the loss of potassium chloride. The method can be applied to the field of potassium chloride production, and the second carnallite can be used to prepare potassium chloride, thereby reducing the loss of potassium chloride.

A method of manufacturing a fertilizer comprising biomass, consists in that the biomass comprising, in dry matter, simple and complex proteins in an amount from 8 to 30% by weight and phosphorus compounds in an amount from 1 to 3% by weight P2O5, is mixed with at least one carbonaceous raw material selected from the group comprising lignite, bark, sawdust, humus, compost, peat and straw in an amount of 5 to 20% by weight in relation to the biomass, is ground to a particle size of less than 5 mm to produce a pulp with a dry matter content from 10 to 70%, then the resulting pulp is mixed with at least one evaporite mineral selected from the group comprising polyhalite, calcite, dolomite, gypsum, anhydrite, carnallite, sylvite, barite, after which the whole is dehydrated to a dry matter content from 40 to 85%, then mixed with alkaline raw materials in an amount sufficient to control the temperature of the mixture in the range from 60 to 140ºC and obtain a moisture content of less than 30%, preferably 10 to 15%, and then the product obtained is granulated to obtain granules with sizes from 1 to 5 mm, and alkaline raw materials forming inorganic coatings are applied to the surface of the granules, after which a substance forming an outer coating is sprayed.

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 invention relates to a carnallite pool deposition thickness classification method and system based on a salt pan remote sensing image. The method comprises the following steps: acquiring an optical remote sensing image containing a carnallite pool area, performing correction and cutting treatment, extracting optical features, and performing logarithmic transformation to obtain a processed image; marking a collected area and an uncollected area of the carnallite pool, and generating a label data file; using a self-attention mechanism to identify a line target of a salt mining ship trajectory, generating an attention weight value of a center pixel of the line target in combination with a line target weight method of physical experience, then carrying out splicing, fusion and convolution processing, and carrying out remodeling to generate a multi-dimensional feature map; and performing classification processing by using the target pixel-level classification model to obtain a deposition thickness classification image of the carnallite pool. By collecting an optical remote sensing image containing a carnallite pool area, combining with area labeling, and utilizing a salt mining ship to carry out line target identification, the carnallite pool area and the deposition state thereof can be accurately identified, and fine classification is realized.