633 results about "Magnesium chlorate" patented technology

A fireproof magnesium oxide board is prepared by mixing the following raw materials, the raw material names and weight parts are as follows: 80-100 parts of magnesium oxide; 20-30 parts of anhydrous magnesium chloride; 10-20 parts of modified expanded vermiculite foaming agent; 20-30 parts of aluminum silicate fiber; 5-10 parts of sawdust; 10-15 parts of fly ash; 8-12 parts of glass magnesium board crushed powder; 1.5-5 parts of non-woven fabric; 10-20 parts of water; wherein the modified expanded vermiculite is prepared by the following steps: (1) Vermiculite is incompletely expanded and calcined; (2) acrylic acid monomer, sodium hydroxide, acrylamide monomer, initiator potassium persulfate, crosslinking aid pentaerythritol polyglycidyl ether, incompletely expanded vermiculite, and water are taken, stirred evenly and ultrasonically dispersed to obtain a first reaction solution, which is placed in a reactor for reaction to obtain a gel material; (3) the gel material is preliminarily crushed and dried, and then further crushed in a ball mill to obtain a fire-resistant expanded vermiculite with water absorption performance.

The invention discloses a preparation method of capillary crystalline self-repairing concrete, which comprises the following steps: adding zeolite powder into a urease solution for dipping treatment to obtain pretreated zeolite powder; adding the pretreated zeolite powder into a mixed solution A containing urea and sodium alginate, adding a calcium chloride solution A, and separating a solid phase to obtain coated zeolite powder; fumed silica is added into a magnesium chloride solution to be mixed, polyethylene glycol is added, ultrasonic dispersion is conducted, and dispersion liquid is obtained; mixing the coated zeolite powder with the dispersion liquid, adding a sodium alginate solution, mixing, adding a calcium chloride solution B, and separating a solid phase to obtain modified zeolite powder; mixing preparation raw materials including the modified zeolite powder, the cement, the fly ash, the polycarboxylic acid water reducing agent and the aggregate to obtain the concrete. The concrete prepared through the method is good in crack self-repairing effect and good in mechanical strength, and the durability and the service life of the concrete can be improved easily.

The invention discloses a multi-dimensional rapid evaluation method for snow-melting agent corrosion resistance of stainless steel, and relates to the technical field of stainless steel performance evaluation.The multi-dimensional rapid evaluation method comprises the steps that sodium chloride, calcium chloride and magnesium chloride are weighed by mass and dissolved in deionized water, acetic acid and sodium hydrogen sulfite are added after dissolution, and the pH value is adjusted to 4-6; performing potentiodynamic polarization scanning and electrochemical impedance spectroscopy testing on the stainless steel sample to obtain pitting potential and impedance modulus; the method comprises the following steps: placing a stainless steel sample in a cyclic corrosion experiment box, carrying out a corrosion experiment under the conditions of controlling the cyclic temperature change of an environment temperature and periodically carrying out cyclic switching of a spraying mode, a humid mode and a drying mode, taking out the sample every set time, and measuring the corrosion rate and the maximum pitting depth; and according to the pitting potential, the impedance modulus, the corrosion rate and the maximum pitting depth, carrying out graded judgment on the corrosion resistance of the stainless steel. According to the method, the corrosion resistance of the stainless steel can be accurately evaluated in a short time.

The invention relates to the technical field of agriculture, in particular to a plant nutrient solution for saline-alkali soil improvement and a preparation method thereof. The invention relates to a preparation method of a plant nutrient solution for improving saline-alkali soil. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides and acid modified calcium-based montmorillonite; preparing humic acid chelated calcium magnesium powder; preparing a binary compound; and preparing the plant nutrient solution. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides from calcium nitrate tetrahydrate and aluminum nitrate nonahydrate, carrying out acid modification on calcium-based montmorillonite by using dilute sulphuric acid, purifying humic acid, and mixing with calcium chloride and magnesium chloride hexahydrate to prepare humic acid chelated calcium magnesium powder. Finally, the three components are added into pig excrement fermentation liquor to prepare a plant nutrient solution, an adsorption-replacement-leaching closed loop can be formed, the desalination and alkali reduction efficiency is remarkably improved, the soil structure is improved, the effect of synergistically improving the saline-alkali soil is achieved, and therefore plant growth is promoted.

The invention provides an efficient environment-friendly petroleum passivator as well as a preparation method and application thereof, and belongs to the technical field of passivators. The preparation method comprises the following steps: reacting bismuth nitrate with tetra (4-carboxyl phenyl) porphyrin and benzoic acid to prepare a carboxyl phenyl porphyrin bismuth-MOF material, reacting antimony nitrate with tetra (4-pyridyl) porphyrin and benzoic acid to prepare a pyridyl porphyrin antimony-MOF material, and performing sol-gel reaction on lanthanum isopropoxide and cerium isopropoxide to prepare lanthanum-cerium sol; the preparation method comprises the following steps: mixing calcium nitrate, magnesium chloride, organic acid, organic amine and hydrogen peroxide for reaction to prepare a calcium / magnesium organic matter, mixing the calcium / magnesium organic matter with other substances, adding the mixture into an acetonitrile / ethanol mixed solvent, and uniformly stirring and mixing to prepare the efficient environment-friendly petroleum passivator. The high-efficiency environment-friendly petroleum passivator prepared by the invention is green, safe, non-toxic and efficient, has better capturing and passivating effects on metal ions such as nickel and vanadium in the catalytic cracking reaction process of heavy oil, improves the activity of a catalyst, prolongs the service life of the catalyst, and thus, has a wide application prospect.

The invention discloses sodium titanate with a layered crystal structure, a preparation method of the sodium titanate and application of the sodium titanate in a water-based magnesium ion battery, and belongs to the technical field of water-based magnesium ion batteries. According to the invention, the sodium titanate with a layered crystal structure is used as the negative electrode material of the aqueous magnesium ion battery, and due to excellent chemical and structural stability, the sodium titanate can realize reversible Mg < 2 + > intercalation / deintercalation in an aqueous magnesium electrolyte. According to the invention, Na2Ti2O5 and Na2Ti3O7 materials are synthesized by a hydrothermal method and a high-temperature annealing process. In a magnesium chloride electrolyte, the two sodium titanate materials both show extremely low charge and discharge potentials (Na2Ti2O5,-1.3 to-0.6 V vs.SCE; sCE (-1.5 to-1 V vs.SCE) and relatively good cycling stability are achieved. In addition, the charge-discharge specific capacity of the Na2Ti2O5 half cell under the current density of 2A / g is up to 213mAh / g, and the high specific capacity of 150mAh / g is still kept under the high current density of 10A / g. The sodium titanate is an ideal aqueous magnesium battery negative electrode material, has the advantages of low cost and environmental friendliness, and has a great application prospect in the field of aqueous magnesium ion energy storage.

The invention provides a method for synthesizing high-valued amorphous calcium carbonate through carbon sequestration of carbide slag, and belongs to the technical field of carbon sequestration and high-valued utilization of industrial solid waste resources. The method comprises the following steps: carrying out active calcium extraction reaction on a dried and ball-milled carbide slag aqueous solution through ammonium chloride, stirring and filtering to obtain a calcium-containing solution; the method comprises the following steps: adding a certain amount of absolute ethyl alcohol and magnesium chloride into a calcium-containing solution, fully stirring, adjusting the pH value to a certain value, and introducing CO2 gas for mineralization reaction to obtain a turbid liquid containing calcium carbonate precipitate; and carrying out centrifugal separation, alcohol washing and drying on the turbid liquid to obtain powder calcium carbonate. According to the method disclosed by the invention, the calcium carbide slag active calcium liquid is extracted by adopting ammonium chloride, and absolute ethyl alcohol-magnesium chloride is added to precisely regulate and control the reaction steps of CO2 and the extracted calcium liquid, so that the CO2 is efficiently fixed, and meanwhile, mineralization is performed to obtain a mixed crystal type amorphous nano calcium carbonate product. According to the technology, double targets of synthesizing high-valued calcium carbonate through carbide slag carbon sequestration are achieved, and an innovative technical path is invented for current solid waste resource utilization.

The invention discloses a soil conditioner and a preparation method thereof, and relates to the field of soil conditioners, in particular to a soil conditioner and a preparation method thereof. The preparation method of the soda saline-alkali soil improver comprises the following steps: 1, taking fulvic acid, anhydrous calcium chloride, anhydrous magnesium chloride and anhydrous aluminum chloride for later use; 2, dissolving fulvic acid in a deionized water solution to prepare a fulvic acid solution, and then adding anhydrous calcium chloride, magnesium chloride and aluminum chloride into the fulvic acid solution; 3, uniformly stirring and mixing; 4, transferring the stirred mixed solution into a hydrothermal reaction kettle, and heating; 5, after the hydrothermal reaction is finished, cooling to room temperature, carrying out suction filtration, and drying filter residues at low temperature; and 6, grinding the dried filter residues to obtain the soda saline-alkali soil improver. The soda saline-alkali soil improver is an acidic Ca, Mg and Al hydrotalcite intercalation material; an anhydrous calcium sulfate phase and a compound (H3O) Al3 (SO4) 2 (OH) 6 phase containing aluminum and sulfate radicals are mainly used; the pH of the soda saline-alkali soil can be improved more quickly.

The invention discloses a high-bonding-strength magnesium adhesive as well as a preparation method and application thereof. The high-bonding-strength magnesium adhesive comprises the following components: 160-185 parts of light calcined magnesia, 40-54 parts of magnesium chloride, 36-46 parts of magnesium sulfate, 46-60 parts of water, 6-14 parts of soybean protein powder, 1-3 parts of a retarder, 2-6 parts of talcum powder, 3-5 parts of polyvinyl alcohol and 4-8 parts of a waterproof agent. The waterproof agent comprises sodium methylsilanolate and sodium silicate in a mass ratio of (2-5): 1. The soybean protein is used as the modifier and can be extracted with the magnesium adhesive to form a network interpenetrating structure, so that the number of structural voids and the flatness of the magnesium adhesive are improved, a flat and compact gel system is formed, and the bonding performance of the magnesium adhesive is effectively improved.

The invention provides a biological carbonized magnesium chloride cement residue soil brick and a preparation method thereof, and belongs to the technical field of building materials. The biological carbonized magnesium chloride cement muck brick is prepared from the following raw materials in parts by weight: 3 to 7 parts of muck, 0.6 to 3 parts of magnesium oxide, 0.02 to 0.1 part of magnesium chloride, 0.013 to 0.015 part of a retarder, 0.9 to 1.5 parts of a bacterial solution and 0.5 to 1.5 parts of a urea solution, the bacterial liquid comprises bacillus pasteurii. According to the invention, the muck is used as a main raw material, so that resource utilization of building wastes is realized; through the mutual cooperation of magnesium oxide, magnesium chloride, bacillus pasteurii and urea components and the synergistic effect of microbial mineralization (bio-carbonate) and magnesium chloride cement hydration (chemical gel), the limitation of a single curing technology on strength is broken through, and the compactness and compressive strength of the muck brick are improved.

The invention relates to the technical field of metallurgy, and provides a method and system for preparing a spongy TC4 alloy raw material, and the method comprises the following steps: heating and mechanically stirring titanium tetrachloride, aluminum trichloride and vanadium tetrachloride according to a component proportion required for preparing a TC4 alloy to form a uniform chloride mixture; the chloride mixture is subjected to a reduction distillation reaction in the presence of magnesium, and inert gas is continuously introduced in the reaction process for stirring; and after the reaction is completed, separating the byproduct magnesium chloride to obtain the spongy TC4 alloy raw material. According to the scheme, use of high-cost metal raw materials is avoided from the source, meanwhile, the complex steps of electrode preparation and repeated smelting are omitted through the one-step reduction distillation reaction, and energy consumption and time cost are greatly reduced.

The invention discloses a method for preparing calcium hydroxide with a high specific surface area by digesting calcium oxide, and relates to the technical field of preparation of calcium hydroxide with a high specific surface area. The method is characterized in that diethylene glycol / triethanolamine / magnesium chloride is adopted as a compound digestion aid through two processes of wet digestion and dry digestion; and calcium hydroxide with high specific surface area can be controllably prepared. The specific surface area of the calcium hydroxide prepared through wet digestion can reach 70 m < 2 >. G <-1 > or above, the specific surface area of the calcium hydroxide prepared through dry digestion is 45 m < 2 >. G <-1 > or above, the reaction activity of the calcium hydroxide is effectively improved, and the novel controllable method for preparing the calcium hydroxide with the high specific surface area is provided.

The invention relates to the technical field of biological materials, in particular to a PDRN porous microsphere as well as a preparation method and application thereof. The PDRN porous microspheres are prepared from the following raw materials: PDRN, an oil phase matrix, a curing agent and metal salt, the curing agent is at least one of polyethylene glycol acrylate and polylysine; the metal salt is at least one of calcium chloride, zinc chloride, magnesium chloride and ferric chloride. The PDRN porous microsphere has the advantages of being controllable in size, excellent in disintegration resistance and excellent in swelling resistance, is high in moist heat sterilization tolerance and strength, can be used as a filling material for medical beauty or an ideal candidate material of a tissue engineering scaffold, and has potential application value.

The invention belongs to the field of catalyst preparation, and particularly relates to a binder for catalyst forming and a preparation method and application thereof. The binder for forming the catalyst, provided by the invention, is prepared from the following raw materials in parts by weight: 0.5 to 2 parts of magnesium chloride, 1 to 2 parts of magnesium oxide, 0.5 to 2 parts of sodium carboxymethyl cellulose, 1 to 3 parts of ethylenediamine tetraacetic acid, 2 to 6 parts of nano-hydroxyapatite modified polyester, 1 to 3 parts of organic solvent and 10 to 35 parts of water. When the binder provided by the invention is applied to catalyst forming, on one hand, the problems that a conventional catalyst is poor in binding performance, and acid gas corrodes equipment and pollutes the environment in the roasting process can be solved; on the other hand, the surface acidity of the catalyst carrier can be reduced, a suitable reaction environment can be provided for some reactions needing to be carried out in an alkaline environment or reactions with acidic reactants and intermediates, and the selectivity and conversion rate of the reactions are improved.

The invention discloses a phosphogypsum efficient curing agent and a phosphogypsum harmless treatment method. The curing agent is composed of an exciting agent, a modifying agent and an adsorbent. The exciting agent comprises one or a combination of more of calcium oxide and calcium hydroxide; the modifier comprises one or a combination of more of magnesium oxide, manganese oxide, aluminum oxide, ferric oxide, lanthanum oxide, magnesium chloride, manganese chloride, aluminum chloride, ferric chloride, lanthanum chloride and the like; the adsorbent comprises one or a combination of more of calcium silicate, aluminum silicate, kaolinite, potassium feldspar, calcium metasilicate and the like. The curing agent provided by the invention can efficiently cure soluble phosphorus, fluorine and heavy metal ions in ardealite whether the curing agent and ardealite are mixed and stirred for reaction or a dump leaching process is adopted for treatment, and the curing rates of the soluble phosphorus, fluorine and heavy metal ions in the ardealite reach 99%, 95% and 99%.

A laundry additive composition comprising a plurality of perfume-containing particles, wherein each of said perfume-containing particles comprises: a perfume ingredient; polyethylene glycol; and an inorganic salt carrier which is selected from the group consisting of magnesium sulfate, magnesium chloride, and the combination thereof, wherein each of said perfume-containing particles has a mass of from 1 mg to 1 g and a maximum dimension of from 3 mm to 10 mm.

The invention provides nano magnesium aluminate spinel with high sintering activity and high dispersity and a preparation method thereof, and belongs to the field of nano material preparation. The method comprises the following steps: mixing aluminum chloride, magnesium chloride and deionized water to obtain a mixed solution; adding aluminum bicarbonate into the mixed solution, and carrying out hydrothermal reaction, so that aluminum hydroxide and magnesium hydroxide are precipitated at the same time to obtain a magnesium aluminate spinel precursor; the magnesium aluminate spinel precursor is subjected to first-stage roasting, so that the magnesium aluminate spinel precursor is subjected to flash pyrolysis to form a fine crystal nucleus, and a pyrolysis product is obtained; and performing second-stage roasting on the pyrolysis product to control the crystal nucleus of the pyrolysis product to grow along a specific crystal face, thereby obtaining the nano magnesium aluminate spinel powder. A nanoscale precursor is precisely regulated and controlled to be controllably and orderly separated out through a wet-process system micro-area reaction; the crystal form development, the microstructure and the size uniformity of the powder are controlled through a flash pyrolysis nucleation-crystal face oriented growth two-stage roasting technology.

The invention discloses a high-flame-retardant plate and a production process thereof, and relates to the technical field of flame-retardant materials. The high-flame-retardant plate is prepared from the following raw materials in parts by weight: 90 to 110 parts of magnesium oxide, 15 to 20 parts of magnesium chloride, 30 to 35 parts of magnesium sulfate, 1.5 to 3 parts of modified polyvinyl alcohol, 1 to 2 parts of starch, 0.3 to 0.8 part of modified borax, 0.2 to 0.5 part of silane coupling agent KH-550, 1 to 2 parts of absolute ethyl alcohol, 2.5 to 3.5 parts of nano zinc borate, 2 to 4 parts of chlorinated paraffin-70, 0.5 to 1 part of nano titanium dioxide, 5 to 10 parts of basalt fiber and 0.2 to 0.5 part of calcium stearate. And 90 to 110 parts of deionized water. The raw materials of the high-flame-retardant plate are subjected to condensation cross-linking and nanometer enhancement of the modified polyvinyl alcohol and esterification and chelation treatment of the modified borax, so that the flame-retardant compatibility is improved. In production, pre-dispersion of the silane coupling agent and synergistic mixing of the starch paste are matched with precise viscosity regulation and control and stepped sanding, so that uniformity of the slurry is ensured. And hot pressing parameters are optimized, so that the plate is high in density and excellent in flame retardance and surface precision.

The invention relates to a magnesium salt modified charcoal soil conditioner and a preparation method thereof, and belongs to the technical field of soil improvement. The invention provides a preparation method of a magnesium salt modified charcoal soil conditioner. The preparation method comprises the following steps: (1) preparing a reactant from crop straws and a magnesium chloride solution; (2) preparing a modified reactant from the reactant and a sodium hydroxide solution, and cracking to obtain magnesium salt modified biochar; and (3) mixing magnesium oxide with the magnesium salt modified biochar to obtain the magnesium salt modified biochar soil conditioner. The magnesium salt modified biochar soil conditioner prepared according to the method disclosed by the invention can remarkably improve nitrogen and phosphorus nutrient indexes such as quick-acting phosphorus, ammonia nitrogen and quick-acting nitrogen in soil, can effectively improve acid soil, and also can improve the growth traits and yield of crops.

The invention discloses a preparation process and application of a high-performance novel building material, relates to the technical field of building materials, and aims to solve the problems that a fireproof plate in an existing high-performance novel building material is insufficient in fire endurance, easy to crack and deform at high temperature and incapable of effectively obstructing flame diffusion. The preparation process comprises the following steps: S1, raw material treatment: selecting magnesium oxide, magnesium chloride, silica fume, glass fibers, basalt fibers, plant fibers, nano magnesium hydroxide, a formaldehyde-free adhesive and water as raw materials, then performing alkali liquor soaking and drying treatment on the plant fibers, treating the glass fibers through a coupling agent, and performing microwave treatment on the basalt fibers; s2, raw materials are weighed, specifically, 30-40 parts by weight of magnesium oxide, 15-20 parts by weight of magnesium chloride, 5-10 parts by weight of silica fume and 5-8 parts by weight of glass fibers are sequentially weighed; the method has the advantage of improving the performance of the fireproof plate.

The present invention discloses a method for preparing molten salt-modified magnesium oxide adsorbent particles for carbon dioxide capture. The method involves reacting magnesium chloride as a magnesium source with sodium bicarbonate to produce light basic magnesium carbonate, which is then calcined in stages to produce a microporous magnesium oxide precursor. The microporous magnesium oxide precursor is then impregnated with a mixed salt consisting of nitrate and carbonate, and dried to produce an alkali metal molten salt-modified magnesium oxide powder. A binder is added to the powder, and the powder is extruded to form a granular adsorbent. Applications of the adsorbent are also disclosed. The prepared adsorbent particles have good structural stability and are recyclable. When adsorbing and capturing CO2 at approximately 300°C, the loaded mixed salt forms a molten salt layer on the microporous surface of the magnesium oxide, enhancing CO2 adsorption. The CO2 adsorption capacity reaches over 10 mmol / g (adsorbent), which is more than 10 times higher than that of unmodified magnesium oxide adsorbent. The CO2 desorption rate is also significantly improved, reaching 100% at 400°C.

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

The invention provides an oral thylakoid product for resisting organ failure and aging, which is prepared by the following steps: extracting thylakoid from plants including spinach, arabidopsis thaliana, lettuce, cabbage, green algae or wheat seedlings, redissolving the thylakoid into a buffer salt solution A, and carrying out ultrasonic treatment for 10-20 minutes under the ultrasonic power of 200-500W to prepare a suspension; adjusting the concentration of the suspension to 0.5-2 mg / ml, and obtaining a nano capsule-like body with the particle size of 200-500 nm by using a microfluidic technology; the buffer salt solution A is prepared from 10 to 100 mmol / L of 4-hydroxyethyl piperazine ethanesulfonic acid (HEPES), 1 to 2 mmol / L of ethylenediamine tetraacetic acid (EDTA) disodium, 0.5 to 4 mmol / L of magnesium chloride (MgCl2), 1 to 10 mmol / L of ascorbic acid and 100 to 500 mmol / L of sapoeda sodium (SNAC), and the pH value of the buffer salt solution A is adjusted to 7.5 to 8.0; and the concentration of the capsule in the buffer salt solution A is 100-400 mg / mL. According to the product, self QPRT enzyme of the thylakoid is used for efficiently catalyzing de novo synthesis of NAD + of whole body tissues and organs, so that multiple physiological processes such as energy synthesis enhancement, oxidative stress reduction and inflammatory reaction relief are finally realized, organ failure is efficiently reversed, and organ aging is relieved.

The invention discloses a novel preparation method of basic magnesium hypochlorite and application of the basic magnesium hypochlorite in magnesium-based flame-retardant antibacterial filler. The novel preparation method comprises the following steps: under the assistance of pulsed ultrasound, adding a buffer solution into a sodium hypochlorite solution to adjust the pH value to 9.0-10.5; then adding a magnesium chloride solution for reaction to prepare basic magnesium hypochlorite; intermittent pulses are adopted in the pulse ultrasound, the frequency is 20-40 kHz, and the power density is 100-500 W / L; the pulse ultrasonic technology is introduced, the reaction process can be optimized through the cavitation effect and the micro-mixing effect, the pH distribution of a reaction system is optimized through pulse ultrasound, local overhigh alkalinity is avoided, generation of magnesium hydroxide is inhibited, the particle size of a product can be effectively reduced, and the yield of the product is improved. High-purity basic magnesium hypochlorite (Mg (OH) 2 is less than 1wt%), high available chlorine (greater than or equal to 41%) and narrow particle size distribution (D50lt; and when the flame-retardant antibacterial filler is used as the flame-retardant antibacterial filler, the performance is more excellent.

The present invention provides a method of producing hydrochloric acid, comprising reacting high-temperature gaseous chlorine and water vapour in a carbon-free reverse Deacon reaction (RDR) at a temperature of from about 450 to about 750 °Celsius to produce a mixture of gases comprising hydrogen chloride and oxygen. The chlorine is produced by fusing and electrolysing sodium or magnesium chloride in solid phase. The water vapour comes from thermally decomposing a hydroxide of at least one of calcium, magnesium and iron in the absence of oxygen to produce the water vapour without any admixture of oxygen (e.g., from atmospheric air). The mixture of gases produced by the RDR is immediately contacted with liquid water to dissolve the hydrogen chloride therein, thereby producing hydrochloric acid and a stream of tail gases. Heat is extracted from the hydrochloric acid to maintain its temperature substantially constant until the stream of tail gases is no longer in contact therewith. Thus the chlorine and water vapour are both supplied to the RDR at high purity and require little, if any, preheating. Heat extracted from contacting the mixture of gases with liquid water may be used to keep the RDR within its range of operating temperatures. Oxygen can be separated from the stream of tail gases, and the oxygen-depleted stream can be recycled back to the RDR to give a high percentage conversion of chlorine to hydrogen chloride. The RDR may be uncatalysed and kept within its operating temperature range by radio-frequency volumetric heating in at least one of the IEEE Ku-, K- and Ka-bands. The invention also provides a corresponding apparatus (1h) for producing hydrochloric acid, comprising an electrolytic cell (10) for the electrolysis, a gas-tight kiln (20) for the thermal decomposition, a gas-phase reactor (30) for the RDR, and an absorber (40) for dissolving the hydrogen chloride in the liquid water. The apparatus (1h) may further comprise a separator (80) for separating the stream of tail gases into the oxygen-depleted stream and a stream of oxygen, which may be fed to a steelmaking apparatus (90), for example. The liquid water for dissolving the hydrogen chloride can come from condensing water vapour obtained by drying an aqueous solution of sodium or magnesium chloride or of sodium hydroxide. The apparatus (1h) may therefore also comprise a dryer (60) for drying this aqueous solution, and a condenser (70) for condensing the water vapour thus obtained. Sodium chloride or magnesium chloride in solid phase derived from drying the aqueous solution may be recycled back to the electrolytic cell (10). Electricity for the electrolysis can come from a renewable resource. At least some of the heat for the thermal decomposition may come from the liquid metal which is a co-product of the electrolysis. The invention is therefore highly energy efficient and requires little, if any, extra energy, apart from the electricity required for the electrolysis. The invention also uses commonly available ingredients and produces no greenhouse gases.

The present invention reduces usage of sodium chloride by adding magnesium chloride, and overcomes problems occurring in using magnesium chloride. The present inventors have found that when magnesium chloride is added instead of sodium chloride to noodle strings and a reducing sugar is further added, preferable well-cooked feeling and appearance are imparted in subsequent production process for instant noodles, and thus, the present invention was accomplished. Specifically, the present invention relates to noodle strings for use in production of instant noodles, the noodle strings containing a raw material powder, magnesium chloride and a reducing sugar.

The invention discloses a method for removing iron and copper from molybdenite, which comprises the following steps: uniformly mixing the molybdenite and magnesium chloride, carrying out high-temperature vacuum melting, removing iron sulfide, copper oxide and other impurities in the molybdenite through vacuum chlorination melting, directly recycling magnesium chloride in a condensing disc in one step for reutilization, carrying out water leaching and acid leaching washing on roasting residues, and drying. Removing residual iron oxides and magnesium compounds generated by chlorination to obtain residues rich in molybdenum disulfide; according to the method, the iron and copper impurities in molybdenite are effectively removed in a vacuum chloridizing roasting and acid leaching mode, and the method has the advantages of being short in process, low in cost, high in metal recovery rate and small in environmental pollution.

Embodiments of the present disclosure are directed to systems and methods of removing carbon dioxide from a gaseous stream using magnesium hydroxide and then regenerating the magnesium hydroxide. In some embodiments, the systems and methods can further comprise using the waste heat from one or more gas streams to provide some or all of the heat needed to drive the reactions. In some embodiments, magnesium chloride is primarily in the form of magnesium chloride dihydrate and is fed to a decomposition reactor to generate magnesium hydroxychloride, which is in turn fed to a second decomposition reactor to generate magnesium hydroxide.

The utility model belongs to the technical field of chemical equipment, and discloses an iron and boron removal device in magnesium chloride production, which comprises a dissolving kettle, an impurity removal kettle, a heat preservation sedimentation kettle, a first filtering device, an acid adjusting kettle, an iron and boron removal kettle, a second filtering device, a concentration kettle, a crystallization kettle, a centrifugal machine, a drying machine and a packaging machine which are sequentially communicated through pipelines, adjusting valves and pumps, the dissolving kettle is provided with a magnesium chloride crude product feeding hole and a water feeding hole; a liquid material outlet of the first filtering device is communicated to a feeding hole of the acid adjusting kettle, the iron and boron removing kettle is provided with a hydrogen peroxide feeding hole and a ferric hydroxide feeding hole, and a liquid material outlet of the second filtering device is communicated to a feeding hole of the concentration kettle; and a liquid material outlet of the centrifugal machine is communicated with a water feeding hole of the dissolving kettle through a pipeline. According to the device, iron and boron elements in the magnesium chloride crude product are removed, the treatment effect is good, the purity of the obtained product is high, and the application range is wide.

The present disclosure provides a board material and a preparation method thereof. The board material of the present disclosure includes: an inorganic board, the inorganic board includes a plant fiber and an inorganic material, in which the mass ratio of the inorganic material to the plant fiber ranges from 1.2 to 1.5; the raw material components of the inorganic material include a magnesium sulfate, a magnesium oxide, a magnesium chloride and a modifier, the mass ratio of the magnesium sulfate to the magnesium oxide ranges from 0.4 to 0.5; the mass ratio of magnesium chloride to magnesium oxide ranges from 0.05 to 0.15; the mass ratio of the modifier to the magnesium chloride ranges from 0.025 to 0.045; the 24 h water-absorbing thickness swelling of the inorganic board is less than or equal to 3%.