91results about "Magnesium chlorides" patented technology

The utility model relates to a device for recovering magnesium salt tablets from industrial magnesium salt-containing wastewater, which is characterized in that magnesium salt in industrial waste acid is recovered by adopting an evaporation mode, after the magnesium salt-containing wastewater is filtered and precipitated, a supernatant solution enters an evaporation system to be evaporated and concentrated, a concentrated solution is recovered, cooling and flaking are carried out, and flaked magnesium salt is collected. The evaporation system comprises an evaporator and a condenser. The evaporation system increases the evaporation speed by enhancing evaporation; through the characteristic of normal-pressure evaporation, the problems that the boiling point is increased due to the fact that the solubility of the solution is increased, and energy consumption is increased due to the fact that the requirement for the quality of a heat source is improved in a traditional boiling evaporation process link and the evaporation system works unstably are solved. Compared with the prior art, the energy utilization efficiency is improved, the energy consumption is reduced, the operation stability of the system is improved, and the risk that the evaporator is scaled and blocked is avoided.

The invention belongs to the technical field of anhydrous magnesium chloride production, and particularly relates to a preparation process of anhydrous magnesium chloride, which comprises the following steps: firstly, dissolving magnesium chloride hexahydrate in absolute ethyl alcohol to form a magnesium chloride ethanol aqueous solution, and then dehydrating the magnesium chloride ethanol aqueous solution by using a molecular sieve to obtain the magnesium chloride ethanol solution; carrying out secondary cooling, stirring crystallization, secondary solid-liquid separation and vacuum drying on the magnesium chloride ethanol solution to obtain high-purity anhydrous magnesium chloride; and recycling ethanol liquid obtained by solid-liquid separation and ethanol gas obtained by vacuum drying. The technical scheme provided by the invention is simple in process flow, low in energy consumption, low in equipment requirement, high in product yield and high in purity, and can be directly applied to the fields of electrolytic preparation of magnesium, catalyst carriers and the like.

It is provided a process for extracting nickel sulfate from mining ores, such as serpentine, comprising the steps of conducting a magnetic separation of the mining ores producing a magnetic fraction and a non magnetic fraction; leaching the non magnetic fraction with HCI producing a slurry comprising metals chloride; filtrating the slurry producing a metals chloride liquor; purifying the metals chloride liquor producing a magnesium chloride solution; separating an iron-nickel cake from the magnesium chloride solution; leaching the cake together with the magnetic fraction producing a metallic sulfate solution; extracting nickel and cobalt from the metallic sulfate solution by a ion exchange resin extraction and stripping producing an inorganic stripped phase; submitting the inorganic stripped phase to a liquid-liquid extraction producing a nickel concentrated phase; and evaporating and drying the nickel concentrated phase to recuperate nickel sulfate.

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.

This invention provides a production process for manufacturing metallic magnesium and industrial silicon by decomposing serpentine using the hydrochloric acid method. [Solution] The present invention provides a method for processing serpentine ore as a raw material using a two-stage countercurrent hydrochloric acid leaching process. The wet process steps include storage and filtration of the slurry after ore dressing, two-stage hydrochloric acid leaching under atmospheric pressure, washing and filtration of the silicon slag after leaching, removal of iron and nickel precipitation from the leaching solution, separation, washing and filtration of the obtained iron hydroxide and nickel hydroxide, crystallization and evaporation of the magnesium chloride solution, and production of hydrochloric acid using the gas generated after the thermal decomposition of magnesium chloride. The present invention has developed a serpentine decomposition technology using hydrochloric acid, a metallic magnesium production process using a drying-electrolytic method, and a process for producing industrial silicon by smelting silicon slag in an electric furnace.

The invention belongs to the technical field of inorganic salt preparation, and discloses a method for preparing anhydrous magnesium chloride by dehydrating magnesium chloride hexahydrate, which comprises the following steps: by taking magnesium chloride hexahydrate as a raw material, carrying out preliminary dehydration to obtain low-water magnesium chloride, mixing the low-water magnesium chloride with fluid ammonia to carry out solid-liquid reaction, then carrying out solid-liquid separation and reduced pressure treatment to obtain a solid phase, and further performing high-temperature deamination to obtain anhydrous magnesium chloride. According to the method disclosed by the invention, solid-liquid reaction is directly carried out on the fluid ammonia and the low-water magnesium chloride, so that the use of a large amount of organic solvents and complicated operation steps in a traditional ammonia-gas-based alcohol ammonia method are avoided. Compared with a gas-solid reaction, the solid-liquid reaction has the advantages of being high in reaction speed, high in yield and the like, separation of ammonia and water can be achieved only through decompression treatment, and therefore recycling of ammonia is easy to achieve. Meanwhile, the method avoids corrosion of acid gas to equipment in a gas protection heating method taking hydrogen chloride as protective gas, and large-scale and rapid dehydration of magnesium chloride hexahydrate can be realized.

The invention relates to the technical field of chemical engineering, and provides a calcium chloride and magnesium chloride production device and a production method for preparing calcium chloride and magnesium chloride from dolomite, and the production device comprises a pretreatment assembly, a first-stage reaction kettle and a second-stage reaction kettle which are connected in sequence. The second-stage reaction kettle comprises a tank body, a first outlet formed in the upper part of the tank body and a second outlet formed in the bottom of the tank body. The first outlet is sequentially connected with a water washing tower, a drying device and an evaporation condenser. The second outlet is sequentially connected with a reduced-pressure evaporator, a low-temperature crystallizer, a horizontal centrifuge, a purification tank and a normal-pressure evaporator. The pretreatment assembly, the first-stage reaction kettle and the second-stage reaction kettle are sequentially arranged, so that gradient control over the reaction process is achieved, it is ensured that the acidolysis reaction is more thorough, the chemical purity of calcium chloride and magnesium chloride is improved, precise separation of gaseous impurities and liquid impurities is ensured, and the purification rate of a final product is further increased.

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 application discloses a method for preventing ammonium chloride from sublimating and escaping in a roasting process, and belongs to the field of chemical metallurgy. Alkaline chemical metallurgical materials and ammonium chloride are sequentially subjected to mixing, grinding and compression molding to obtain dense ore agglomerates or ore grains, and the dense ore agglomerates or ore grains are subjected to roasting. In the heating and roasting process, the HCl generated by the thermal decomposition of the ammonium chloride cannot escape, which promotes the reaction of the HCl with alkaline substances in the alkaline chemical metallurgical materials to convert into chlorides, the chlorides are converted into ammine chlorides by absorbing ammonia, and the ammine chlorides on the surface layer of the dense ore agglomerates or ore grains are decomposed by heat to release NH3, so that the probability of the ammonium chloride from sublimating and escaping in the roasting process is greatly reduced. The method has the advantages of high economic efficiency, clean and environmental protection and the like, and is suitable for large-scale industrial production of the roasting of the ammonium chloride in the alkaline chemical metallurgical materials.

The present disclosure provides a method for extracting potassium bicarbonate from a mineral mixture. The method includes combining potassium chloride, sodium bicarbonate, and magnesium carbonate trihydrate in an aqueous solution. The aqueous solution is cooled to form Engel's salt comprising potassium bicarbonate magnesium carbonate tetrahydrate. Engel's salt is separated from the aqueous solution and leached with water to produce an aqueous potassium bicarbonate solution and magnesium carbonate trihydrate. The method may further include recycling at least a portion of the magnesium carbonate trihydrate produced from leaching Engel's salt back into the aqueous solution. The aqueous potassium bicarbonate solution can be processed to produce various potassium bicarbonate products.

The present disclosure relates to a process of extracting magnesium or magnesium compounds from a ferronickel slag feed comprising magnesium and silica compounds, the process comprising: a comminution step to reduce a particle size distribution of the ferronickel slag feed; and an acid leaching step after the comminution step, comprising: leaching the ferronickel slag feed from the comminution step in a vessel with hydrochloric acid at a concentration of 5-15 wt.% HCl to form a leached slurry, controlling the hydrochloric acid concentration during leaching by adding further hydrochloric acid to the vessel to maintain the hydrochloric acid concentration at 5-15 wt.% HCl, and obtaining a leached slurry from the vessel, wherein the leached slurry comprises a liquid portion and a solids residue, and wherein the liquid portion comprises magnesium chloride.

The present disclosure relates to a method of carbon dioxide mineralisation, the method comprising: treating a material, such as a mineral, with carbon dioxide and a base, wherein the treatment occurs in solution phase, the material comprising: a first cation that is Ca or Mg; a second cation which is not Ca and or Mg; and one or more anions which are not carbonate; such that a product solution comprising an acid or a salt of the base and one of the one or more anions and a salt of the second cation and one of the one or more anions is formed, and a carbonate salt of the first cation is caused to precipitate.

A method for producing Mg-containing particles by performing a classification process using a centrifugal airflow classifying device, the centrifugal airflow classifying device including: a housing; a rotating body that rotates within the housing; a classification chamber located on an outer edge side of the rotating body; and a flow path formed by an inner surface of the housing and a top surface of the rotating body, connecting an upstream end portion with the classification chamber, wherein the method for producing Mg-containing particles includes: supplying the unclassified Mg-containing particles to the classification chamber so that an average flow velocity of the unclassified Mg-containing particles on a downstream side from the upstream end portion in the flow path is lower than an average flow velocity of the unclassified Mg-containing particles at the upstream end portion flowing inside the flow path; and classifying the unclassified Mg-containing particles in the classification chamber to obtain Mg-containing particles, wherein an attrition durability A (%) of the unclassified Mg-containing particles calculated by the following formula (1) is 85 or less: A = (Z ÷ Y) x 100... (1).

A system and method for producing minerals from divalent ion-containing brine stream includes rejecting sulfate from a divalent-ion rich reject stream in a first nanofiltration seawater reverse osmosis (NF-SWRO) unit, producing solid calcium sulfate dihydrate and a magnesium-rich brine stream in a first concentration unit, concentrating the magnesium-rich brine stream to a saturation point of sodium chloride in a second concentration unit, producing solid sodium chloride and a supernatant product stream in a first crystallizing unit, produce a concentrated magnesium-rich bittern stream from the supernatant product stream in a third concentration unit, and at least one of producing hydrated magnesium chloride from the concentrated magnesium-rich bittern stream in a second crystallizing unit and producing anhydrous magnesium chloride by prilling the concentrated magnesium-rich bitterns stream under a hydrogen chloride atmosphere in a dry air process unit.

The invention discloses a magnesium alloy workshop slag refining and recycling system and method, and belongs to the technical field of non-ferrous metallurgy and solid waste recycling, the system comprises a pretreatment and activation module, a magnesium metal efficient extraction module, a harmlessness and recycling module and an oxide purification module which are connected in sequence; the method comprises the following steps: carrying out crushing, grinding and low-temperature roasting activation on the magnesium slag in an inert atmosphere; the activated slag powder is subjected to gradient heating smelting, electromagnetic stirring is applied, liquid magnesium is separated and recycled, and meanwhile gaseous magnesium is recycled through vacuum condensation; the smelting residues are subjected to water quenching, solid-liquid separation and evaporative crystallization to recover salts, and condensate water is recycled; and carrying out flotation, acid pickling and calcination on the solid slag to produce high-purity magnesium oxide. Through cooperation of multiple modules, the high recovery rate of magnesium metal, remarkable reduction of energy consumption and full-component recycling of waste residues are achieved, and finally a new efficient, clean and high-value magnesium alloy slag recovery way is formed.

The invention relates to the technical field of chlor-alkali industry, in particular to a chlor-alkali industry salty mud resource utilization device and method.The chlor-alkali industry salty mud resource utilization device comprises a washing pool used for washing salty mud to melt sodium chloride in the salty mud; the first filter press is used for separating a solution containing sodium chloride from the dry salty mud material; the calcium chloride production device comprises a reaction tank for the reaction of limestone and hydrochloric acid, and a neutralization tank for adding alkali for neutralization, the reaction tank is used for receiving the separated dry salty mud material; according to the chlor-alkali industry salty mud resource utilization device and method, calcium ions in calcium carbonate are recycled, and sodium chloride and magnesium hydroxide are recycled, so that recycling is more thorough.

The present invention provides a zero-discharge treatment system and method for magnesium-based desulfurization wastewater. The system utilizes a wastewater pre-sedimentation tank, a wastewater collection tank, a flocculation reaction tank, an inclined tube clarifier, and a filtration device to remove impurities such as hardness, heavy metals, and suspended solids from the desulfurization wastewater. The concentrated solution then passes through a third-, first-, and second-effect evaporation crystallization device, sequentially passing through a freeze crystallization device and centrifuge I to produce magnesium sulfate heptahydrate. The mother liquor at the outlet enters a defluorination device. The defluorination device outlet is sequentially passed through a single-effect evaporation crystallization device and centrifuge II to produce magnesium chloride. The mother liquor at the outlet also enters the defluorination device. The first-, second-, and third-effect evaporation crystallization devices are connected to condensation device I, and the single-effect evaporation crystallization device is connected to condensation device II. Condensate is recycled. Sludge water from the bottom of the wastewater pre-sedimentation tank, inclined tube clarifier, and defluorination device is filtered through a plate and frame filter press. Advantages include the step-by-step removal of various harmful substances from magnesium-based desulfurization wastewater, achieving the rational resource utilization of wastewater and waste.

Provided is a method for producing an orally ingestible magnesium compound without heat generation. The method for producing bittern according to the present invention is characterized by bringing flame-retardant magnesium into contact with strongly acidic electrolyzed water generated by electrolysis of an aqueous sodium chloride solution.

The invention provides a method for preparing a snow-melting agent by comprehensive utilization of chlor-alkali salt mud solid waste, and belongs to the technical field of solid waste resource comprehensive utilization and inorganic material synthesis. The method comprises the following steps: firstly, preparing chlor-alkali salt mud and water into slurry, then adding concentrated hydrochloric acid at one time under the action of a dispersing agent and an acidification auxiliary agent, then adjusting and concentrating through a calcium-containing solid alkaline substance, adding chitosan to remove impurities, and finally realizing the precipitation of the snow-melting agent in an alcohol precipitation solution of ethanol and ethyl acetate. According to the method, the utilization rate of the salty mud reaches 86.37%-88.61%, the extraction rate of effective components reaches 96.5%-99.0%, the precipitation rates of Ca < 2 + > and Mg < 2 + > in the solution respectively reach 95% or above and 96.3% or above, the yield of the snow-melting agent reaches 95.5%-99.99%, the whiteness of the snow-melting agent reaches 98.0% or above, no waste liquid is generated in the whole process, cyclic utilization of salty mud solid waste is achieved, and remarkable environmental benefits and economic benefits are achieved.

The invention provides a magnesium-based compound inhibitor for inhibiting spontaneous combustion of coal and a preparation method of the magnesium-based compound inhibitor, modified Mg (OH) 2 and MgCl2 solutions are mixed according to m (modified Mg (OH) 2): m (MgCl2) = 1: (0.25-4), Mg (OH) 2 coarse powder is modified by a KH570 silane coupling agent, the modified Mg (OH) 2 and MgCl2 solutions are uniformly mixed according to different mass ratios after treatment to prepare the compound inhibitor, compared with a single inhibitor, the compound inhibitor has the advantages that the preparation method is simple, and the preparation cost is low. The compound inhibitor combines water absorption and cooling of MgCl2 in a low-temperature stage and chain reaction inhibition of Mg (OH) 2 in a high-temperature stage, has the advantages of being high in dispersity, high in inhibition efficiency, long in inhibition time, low in preparation cost and the like, and has important significance in the field of coal mine fire prevention and extinguishing and coal mine safety production.

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 present disclosure relates to a method that includes treating a layer of ZnTe with a metal halide, where the layer has a first grain size between 25 nm and 250 nm before the treating and the layer has a second grain size after the treating that is larger than the first grain size. In some embodiments of the present disclosure, the ZnTe may include at least one of Zn1-wCdwTe, ZnTe1-xSex, Zn1-yCdyTe1-zSez, or a combination thereof and each of w, x, y, and z are independently between 0 and 0.9, inclusively.

A system and method for producing minerals from divalent ion-containing brine stream includes rejecting sulfate from a divalent-ion rich reject stream in a first nanofiltration seawater reverse osmosis (NF-SWRO) unit, producing solid calcium sulfate dihydrate and a magnesium-rich brine stream in a first concentration unit, concentrating the magnesium-rich brine stream to a saturation point of sodium chloride in a second concentration unit, producing solid sodium chloride and a supernatant product stream in a first crystallizing unit, produce a concentrated magnesium-rich bittern stream from the supernatant product stream in a third concentration unit, and at least one of producing hydrated magnesium chloride from the concentrated magnesium-rich bittern stream in a second crystallizing unit and producing anhydrous magnesium chloride by prilling the concentrated magnesium-rich bitterns stream under a hydrogen chloride atmosphere in a dry air process unit.

A method for preparing metallic magnesium and industrial silicon by decomposing serpentine with hydrochloric acid is provided. Serpentine is used as a raw material, and is processed by a two-stage countercurrent leaching process in a hydrochloric acid system. A hydrometallurgical process is adopted, including beneficiation, wet grinding, slurry storage, filtration, two-stage atmospheric pressure hydrochloric acid leaching, washing and filtration of leached silica slag, iron removal and nickel precipitation from a leachate, separation, washing and filtration of a ferric hydroxide precipitate and a nickel hydroxide precipitate, crystallization and evaporation of a magnesium chloride solution, and hydrochloric acid preparation from a flue gas generated after thermal decomposition of magnesium chloride. The present disclosure develops a process of decomposing serpentine with hydrochloric acid and producing metallic magnesium by a drying-electrolysis method, and a process of producing industrial silicon by smelting silica slag in an electric furnace.

This invention relates to a method for treating and utilizing high magnesium-to-sulfur ratio chlorine-containing wastewater, belonging to the field of environmental protection. This invention utilizes inexpensive calcium alkali to treat high magnesium-to-sulfur ratio chlorine-containing wastewater. During the treatment process, dilute hydrochloric acid is used as a circulation starter. Taking advantage of the difficult-to-remove chloride ions in the wastewater, the calcium alkali is used to generate calcium chloride solution, thereby continuously recovering sulfate ions from the high magnesium-to-sulfur ratio wastewater. Magnesium is converted into magnesium hydroxide, transforming into valuable by-products such as calcium chloride and gypsum, thus achieving resource utilization of waste. This method reduces the environmental impact of wastewater discharge, while also reducing treatment costs and achieving resource recycling. It is highly feasible for existing enterprises and has significant economic, social, and environmental benefits.

The present application relates to a kind of preparation methods of high solubility seawater crystal, comprising the following steps: S1, the sodium chloride of predetermined proportion is mixed with calcium chloride, obtain sodium chloride-calcium chloride premix, wherein calcium chloride is screened before mixing Processed;S2, the magnesium chloride of predetermined proportion, magnesium sulfate and potassium chloride are mixed and stirred, then sodium chloride-calcium chloride premix is added, and seawater crystal is prepared after being mixed uniformly.The method can reduce the adhesion of magnesium sulfate and calcium chloride, reduce the generation of insoluble calcium sulfate, solve the existing seawater crystal dissolution problem from the root, effectively improve the solubility of seawater crystal, speed up the dissolution rate, make the ion release more uniform, solve the problem of insufficient dissolution, easy to block, the dissolution effect of finished product is better than prior art.

This invention provides a method to solve the problem of crystallization of magnesium hydroxide, which is extremely difficult to dissolve in water, in the production of hydrogen by plasma. [Solution] When magnesium chloride aqueous solution is prepared using a hydroxycarboxylic acid such as citric acid or gluconic acid in a molar ratio of 1.2 times or more of magnesium hydroxide to magnesium hydride, the magnesium hydroxide reacts with the aqueous solution and dissolves, so the magnesium hydroxide does not crystallize.

The utility model provides an anhydrous magnesium chloride preparation device. The anhydrous magnesium chloride preparation device comprises: a reaction unit comprising a reaction main body and a heating assembly arranged on the reaction main body, the reaction main body having a reaction chamber; the tail gas treatment unit comprises a main body structure and a spraying assembly, the main body structure is provided with a containing cavity, the containing cavity is communicated with the exhaust end of the reaction cavity, the spraying assembly comprises a first conveying part and a liquid conveying main pipe, the first conveying part is installed on the liquid conveying main pipe, and a spraying head is arranged at the liquid outlet end of the liquid conveying main pipe and located in the containing cavity. The anhydrous magnesium chloride preparation device adopting the technical scheme provided by the utility model can solve the problems that the atmospheric environment is polluted and resources are wasted when a preparation device in the prior art is used for preparing anhydrous magnesium chloride.

The invention relates to the technical field of magnesium chloride production, in particular to a production process for preparing magnesium chloride in an anhydrous system. The method comprises the following steps: firstly, carrying out medium-low temperature grading dehydration on the solid magnesium chloride mineral aggregate to control the total amount of free water and crystal water to be not higher than 0.5 wt%; then directly melting at the temperature of 710-725 DEG C, and reducing the mass fraction of insoluble substances in a melt to 0.05 wt% or below through the combined action of standing deslagging and one-time micropore high-temperature filtration; and after the melt is conveyed in a heat preservation mode with the temperature drop not exceeding 8 DEG C, the melt is rapidly cooled and solidified through a narrow gap, secondary cooling is conducted in the inert atmosphere, nitrogen-filled packaging is conducted, and water dissolution and evaporation steps are not introduced in the whole process. The purity of the obtained flaky magnesium chloride MgCl2 is larger than or equal to 99.5 wt%, impurities such as Ca2 and SO42 meet the food safety standard, meanwhile, the comprehensive energy consumption is reduced by 20%-30% compared with a traditional wet method, and the fresh water consumption is almost zero.

A self-sustainable process and system for treating water wherein at least a portion of the water is fed through a reactor for the removal of carbonates-based chemical by precipitation and at least some of the calcium carbonate precipitant is regenerated to a calcium-based chemical and carbon dioxide which is at least partially utilized to remineralize said fluids in a post-treatment process.