155 results about "Chloride salt" patented technology

The invention provides a method for extracting lithium, rubidium and cesium through strengthened roasting of lepidolite and preparing lithium, rubidium and cesium salt, and belongs to the technical field of lithium, rubidium and cesium extraction.The method comprises the steps that lepidolite, a carbon / sulfur additive and chlorine salt are subjected to ball milling, roasting and grinding, and roasted sand is obtained; through thermodynamic analysis on the lepidolite, after the carbon / sulfur additive is introduced, the Gibbs free energy of the reaction of the lepidolite and the additive is reduced, the reaction trend is improved, and in the roasting process, ions such as sodium, potassium and calcium in chlorine salt and the carbon / sulfur additive are replaced in a similar isomorphic manner, so that lithium, rubidium and cesium are leached more easily; in the process of intensifying roasting by introducing the carbon / sulfur additive, the use amount of the chlorine salt additive is reduced by 10-25%, potassium-sodium mixed salt and calcium oxalate are recycled, the recycling rate is greater than 50%, and the leaching residue amount is reduced by 30-40%; and the carbon / sulfur additive can directionally promote the reaction of the calcium salt additive and the lepidolite and convert the calcium salt additive into dicalcium silicate, so that the leaching residues obtained in the subsequent leaching process are easier to recycle.

The invention discloses marine concrete resistant to chlorine salt erosion and a preparation method thereof, and belongs to the technical field of building materials. The marine concrete is prepared from the following components in parts by mass: 280 to 350 parts of cementing material, 1100 to 1200 parts of aggregate, 150 to 180 parts of mixing water and 2.5 to 4.0 parts of high-efficiency water reducing agent, and the cementing material is prepared from 210 to 270 parts of ordinary Portland cement, 50 to 70 parts of superfine slag powder and 10 to 20 parts of modifier on the basis of the cementing material; on the basis of the modifier, the modifier is prepared from 30 to 45 parts of hexacalcium aluminoferrite, 25 to 35 parts of metaettringite, 20 to 35 parts of tobermorite, 3 to 6 parts of nano attapulgite and 2 to 4 parts of a nano composite material. The components can accelerate the early hydration of cement and the volcanic ash reaction process in the concrete hardening process, so that the concrete can form a compact microstructure in the curing period and cooperate with the curing effect of a hydration product on chloride ions, thereby remarkably improving the chloride ion penetration resistance of the concrete, prolonging the service life of the structure and improving the concrete quality. The method is suitable for port engineering, maritime work structures and buildings in salinized soil areas.

The invention discloses a fused salt purification method and a fused salt purification device.The fused salt purification method comprises the following steps that S1, in an oxygen-free and water-free operation environment, fused salt is put into a reaction container, firstly, the fused salt is heated to a first preset temperature and kept for a first preset duration, and then the fused salt is heated to a second preset temperature and kept for a second preset duration; s2, mixed gas of HCl and H2 is introduced into the reaction container heated to the second preset temperature, HCl is cut off after a period of time, then H2 is used for bubbling for a period of time, inert gas is introduced for bubbling, residual HCl and H2 in the molten salt are removed, and purified molten salt is obtained. The molten salt purification device comprises a gas supply system, a reaction container and a storage container, the device can treat kilogram-level chlorine salt in batches, and the molten salt purification efficiency is high.

The invention provides chlorine-doped nickel oxide, a preparation method and application thereof and a photoelectric device, and relates to the field of photoelectric materials.The preparation method of the chlorine-doped nickel oxide comprises the following steps that S10, an aqueous solution of nickel salt and chlorine salt is obtained, an alkaline solution is dropwise added, centrifugation is conducted, and a coprecipitate is obtained; s20, washing, drying and roasting the coprecipitate to obtain chlorine-doped nickel oxide; wherein the molar ratio of the nickel salt to the chlorine salt is (10-20): (1-4). In the technical scheme provided by the invention, the nickel salt and the chlorine salt are co-precipitated to generate a co-precipitate of nickel hydroxide and chloride, and then the co-precipitate is washed, dried and roasted to prepare the chlorine-doped nickel oxide, so that the hole mobility of the chlorine-doped nickel oxide is improved; the alkaline solution is dropwise added for coprecipitation, so that the particle size of the coprecipitate can be reduced, and the nanoscale chlorine-doped nickel oxide is prepared, so that the dispersity of the chlorine-doped nickel oxide in a mobile phase is improved, and the chlorine-doped nickel oxide can be applied to preparation of a hole transport film and improvement of the uniformity of the hole transport film.

The invention discloses a building material base material produced by utilizing household garbage incineration waste and a preparation process of the building material base material. The base material is prepared from the following components in percentage by weight: 30 to 50 percent of fly ash, 20 to 40 percent of bottom slag, 10 to 20 percent of Portland cement, 3 to 10 percent of Fe-N-C-coated Cu-NPs modifier and 5 to 15 percent of water. Fly ash is subjected to water washing and 600-800 DEG C heat treatment to remove chlorine salt and organic matter, and bottom slag is subjected to screening and magnetic separation to control the particle size and the iron content. Fe-N-C-coated Cu-NPs is prepared through high-temperature pyrolysis and a wet chemical method, and dioxin decomposition and heavy metal solidification are catalyzed. The preparation process comprises the steps of pretreatment, mixing, vibration molding (5-10 MPa) and wet curing (20-35 DEG C, 80-95% humidity and 7-21 days). The compressive strength of the base material reaches 11.8-14.0 MPa, the dioxin content is lower than 0.1 ng-TEQ / kg, the heavy metal curing rate is 96.5-98.5%, the porosity is 10.5-12%, solid waste resource utilization is achieved, and environmental protection and economic benefits are achieved.

The invention provides a method for synthesizing sodalite from 4A zeolite and synchronously solidifying radioactive waste salt in situ, and belongs to the technical field of radioactive waste salt solidification treatment of spent fuel dry post-treatment. The preparation method comprises the following steps: mixing 4A zeolite powder, radioactive waste salt, alkali metal chloride salt and a dispersing agent according to a certain liquid-solid ratio, heating, and drying to obtain a cured precursor; and grinding and sieving the cured precursor, and sintering under the condition of not exceeding 900 DEG C to obtain the sodalite cured body. The method provided by the invention is low in energy consumption, simple in process operation, small in 4A zeolite dosage, high in radioactive waste salt coating rate and high in radioactive element fixing amount; the synthesized sodalite solidified body is high in thermal stability and mechanical hardness, the normalized leaching rate after the sodalite solidified body is soaked in water at 90 DEG C for 28 days is smaller than 5 * 10 <-4 > g / (cm < 2 >. D), and the sodalite solidified body can be geologically stored for a long time, so that the migration, diffusion and leakage risks of radioactive substances are effectively reduced.

A porous iron phosphate, a preparation method therefor, and the use thereof. The preparation method comprises the following steps: (1) mixing a carbon source, a chloride salt and an iron source with a solvent, adding aqueous ammonia, freezing same, and performing freeze-drying treatment to obtain a xerogel material; (2) carbonizing the xerogel material to obtain a Fe2O3-C precursor having a 3D network structure; and (3) mixing the Fe2O3-C precursor, urea and phosphoric acid with a solvent, heating and reacting same, and then carrying out sintering treatment to obtain the porous iron phosphate. The iron phosphate prepared by the method has a three-dimensional porous structure; and because of said structure, a lithium iron phosphate positive electrode material prepared by means of using the iron phosphate as a precursor exhibits an increased specific surface area, which shortens the diffusion path of lithium ions and accelerates the diffusion, thereby improving the electrochemical properties of lithium ion batteries.

The invention belongs to the technical field of material corrosion protection, and particularly relates to a titanium-based corrosion inhibitor of a chloride molten salt medium and a preparation method and application of the titanium-based corrosion inhibitor. The corrosion inhibitor comprises an inner core made of sponge titanium particles; the outer layer is a mixed layer of magnesium oxide and amorphous carbon, and in the mixed layer, the magnesium oxide is dispersed in the amorphous carbon in the form of particles of 1-20 nm. The method comprises the following steps: S1, obtaining sponge titanium particles; s2, mixing a magnesium source, a carbon source and a dispersing agent, and preparing a solution with water; s3, adding sponge titanium particles into the solution, and uniformly stirring; s4, drying the dispersion liquid in a hot air atmosphere; and S5, calcining the dried mixed particles in a nitrogen atmosphere to obtain the titanium-based corrosion inhibitor of the chloride molten salt medium. The corrosion inhibitor can effectively remove impurities such as water and oxygen in the chlorate, and the corrosion resistance of a container material in the chlorate is improved.

The invention discloses a method for recovering manganese and lead by reducing and leaching electrolytic manganese anode slag through alkali-activated sulfur powder, which comprises the following steps: S1, uniformly mixing the electrolytic manganese anode slag, the sulfur powder and solid alkali, and heating and activating to obtain an activated and reduced material; s2, the activation reduction material is leached with dilute sulfuric acid, and a manganese-containing leaching solution and lead sulfate-containing leaching residues are obtained after liquid-solid separation; and S3, the leaching residues are leached through a chlorine salt solution, and a lead-containing solution and the leaching residues are obtained after solid-liquid separation. The method is simple and easy to operate, the reducing agent is wide in source and low in cost, the leaching rate of manganese and lead can be effectively increased, and the concentration of impurities in the leachate is low; secondary waste residue pollution and waste gas pollution are not generated in the whole process, so that the pollution to the environment is effectively reduced.

The invention provides vanadium-based MXene and an etching preparation method thereof, and the etching preparation method comprises the following steps: step 1, placing MAX powder, chlorate and alkali in a container, wherein the chlorate is placed between the MAX powder and the alkali; 2, the container is heated and subjected to heat preservation for a certain time; 3, after reacting for a certain time, stopping heating and cooling to obtain an etching mixture; and 4, the etching mixture is subjected to washing treatment and drying treatment, and the vanadium-based MXene can be obtained. According to the etching preparation method, the problem of over-etching can be avoided, and meanwhile, the preparation method is better in selectivity; no fluorine participates, so that the safety is relatively high; the etching preparation time is short, reaction equipment is simple, and the cost is low.

The invention discloses a high-entropy metal sulfide nano material and a preparation method thereof, and relates to the field of high-entropy materials.Transition metal chlorate and sodium chloride are placed in a first reaction boat in the upstream area of a reaction container; placing the zinc sulfide nano-template in a second reaction boat in a downstream area of the reaction container; heating the reaction container to 500-525 DEG C at a first heating rate, keeping the temperature for 20-40 minutes, and transporting metal chloride gas volatilized by the eutectic effect of the precursor to a second reaction boat in a downstream area along with the dynamic airflow, so that the zinc sulfide nano-template reacts with the metal chloride gas; and cooling to room temperature at a second cooling rate, and collecting a solid product in the second reaction boat to obtain the high-entropy metal sulfide nano material. According to the method, the complex microstructure of the precursor template can be copied, and topological conversion is realized; and the chemical morphology, the components, the crystal structure and the like of the high-entropy nano material can be regulated and controlled.

The present invention relates to the use of at least one oxoacid reducing element, and optionally a salt of the oxoacid reducing element, in a molten chloride fuel salt for a molten-salt nuclear fission reactor (MSR). The present invention also relates to a process of nuclear fission within a molten-salt nuclear fission reactor (MSR), said process being characterized in that it is carried out within the MSR reactor, placed in which is an oxoacid reducing element, and optionally a salt of the oxoacid reducing element. The present invention further relates to a molten-salt nuclear fission reactor (MSR) comprising a molten chloride fuel salt, and a mixture comprising the aluminum metal, and its oxidized form, as an oxoacid reducing element, and optionally a salt of the oxoacid reducing element.

The present invention relates to the technical field of ice prevention for foundation pits, and in particular, to an ice-preventing concrete material, its application, and a method for constructing ice prevention for the side walls of foundation pits. The ice-preventing concrete material includes concrete and ice-preventing particles, and the ice-preventing particles are obtained by mixing silicate cement, chloride salts, ammonium salts, lignin, and water; the chloride salt is one of calcium chloride, magnesium chloride, potassium chloride, ferric chloride, and aluminum chloride, and the ammonium salt is one of urea, ammonium nitrate, and triethanolammonium. The present invention prevents the formation of ice hanging on the side walls of foundation pits through the slow dissolution and penetration principle of ammonium salts and chloride salts, thereby avoiding safety accidents caused by ice hanging falling; the concrete and ice-preventing particles can be mixed evenly, so that they can be effectively applied or sprayed on the side walls of foundation pits, and the preparation is simple, the degree of structural corrosion is small, the pollution to the soil is small, and it has the characteristics of economy, safety, and environmental protection.

This invention discloses a precision grinding process for machining the shaft of a swimming pool pump motor, relating to the field of shaft precision grinding technology. The process includes: Step 1: Establishing an incident window using a coherent jet nozzle, allowing the jet to penetrate the air gap into the grinding zone, first wetting and then introducing the load, and recording the incident window, jet posture, and dressing rhythm as working condition metadata; Step 2: After precision grinding, according to the material type, magnetic noise is used for ferromagnetic steel and X-ray diffraction is used for austenitic steel to obtain thermal damage and residual stress, and combining this with cleanliness to generate a surface integrity label and bind it to the working condition metadata; Step 3: Performing deionized ultrasonic cleaning and rinsing according to the label to remove chloride salts and free iron, rebuilding the passivation film according to specifications using chemical passivation, controlled drying, and clean sealing; Step 4: Under the premise of qualified chemical condition, performing isotropic ultra-finishing and low-plasticity rolling on the sealed working zone to form surface compressive stress and maintain geometric tolerances, quickly indicating inspection and writing back the label.

The present invention provides a post-treatment method for improving the purity of K / NaMgF3 particles, particularly relating to the field of chemistry. The method comprises the following specific steps: (1) placing K / NaMgF3 particles in an aqueous solution and stirring and dissolving them thoroughly; (2) adding a fluoride salt and a buffer to the solution treated in step (1) and stirring thoroughly; (3) adding a magnesium salt and a chloride salt to the solution treated in step (2) and stirring thoroughly; and (4) pouring out the residual solution treated in step (3) and drying the residual solid in step (4). The K / NaMgF3 of the present invention remains unchanged and does not introduce new impurities. The method can remove MgF2 impurities while neither destroying the structure of K / NaMgF3 nor introducing new impurities. The steps are closely related, and no intermediate rinsing or treatment is required. The process is simple, and while ensuring efficient impurity removal, energy conservation and environmental protection are also taken into account. The method is applicable to various K / NaMgF3 preparation methods, does not use toxic and hazardous substances, and has low waste liquid treatment costs.

A comprehensive utilization and treatment method and equipment system for ammonia distillation wastewater from the ammonia-soda process includes an evaporation and concentration chamber, a heat pump system, a cooling chamber, a freezing separation chamber, a heat exchanger, an evaporation and crystallization chamber, and a cooling crystallization chamber. Combined with solar radiation, the wastewater undergoes a multi-stage heat exchange cycle through evaporation, cooling and freezing separation, gas-liquid separation, evaporation and crystallization, and cooling crystallization. This process effectively and continuously separates sodium chloride and calcium chloride salts while recovering fresh water. The sodium chloride recovery rate is 75%, the calcium chloride recovery rate is 75%, and the fresh water recovery rate is 55%. This reduces the input cost of raw salt and the amount of mixed solids landfilled in the alkali production process, lowering operating costs. The wastewater can be directly used as lime slurry or, after treatment, as raw water for molten salt, conserving water resources. Through the comprehensive utilization of the wastewater, evaporation efficiency is increased, land area previously occupied by solar pond evaporation of the wastewater is reduced, and the comprehensive utilization of waste resources is maximized.

A reagent for chlorine analysis includes N, N-diethyl-p-phenylenediamine (DPD), an inorganic chloride salt at a concentration of 0.5 M or more, and water. Further, a method for detecting chlorine in an aqueous sample includes performing a photometric assay on a test sample. The test sample comprises: a water-containing sample; and a DPD reagent containing DPD, an inorganic chloride salt having a concentration of 0.5 M or more, and water. The reagents and detection methods can be used with little or no strong acid.

The invention belongs to the technical field of safety and environmental protection, and provides a coalbed methane produced water resource utilization process which comprises the following steps: obtaining coalbed methane produced water containing various chloride salts, and pretreating the coalbed methane produced water containing various chloride salts to remove impurities; the method comprises the following steps: conveying coal bed gas produced water from which impurities are removed and which contains various salts such as chlorides and the like to a multi-effect evaporation assembly, and sequentially carrying out five-effect countercurrent evaporation, three-effect countercurrent evaporation and single-effect vacuum evaporation treatment, so as to obtain NaCl solids, KCl solids and salt slurry containing CaCl2; and feeding the salt slurry containing CaCl2 into a spray drying device, and drying to obtain a CaCl2 solid. NaCl solids, KCl solids and CaCl2 solids are obtained through five-effect countercurrent evaporation, three-effect countercurrent evaporation, single-effect vacuum evaporation and drying treatment, salt products meet the requirements of industrial salt, and coal bed gas produced water is utilized to a large extent.

The application relates to the technical field of concrete testing, and discloses a high-performance concrete testing method for resisting the action of chloride salt freeze-thaw, which comprises a workbench, a plurality of detection stations are arranged on the workbench, a plurality of sensing control lifting frames are arranged on the two sides of the workbench, a plurality of detection cover plates are arranged on the top of the sensing control lifting frames, the detection cover plates correspond to the positions of the detection stations, in the application, the concrete test sample is placed on the detection station, when the conveying belt conveys the sample to the specified position, the sensing control lifting frame senses the position of the detection station, drives the detection cover plate to move downwards until the cover plate covers the detection station, at this moment, the detection probe is located in the detection station, the internal concrete sample is proportionally detected, and the detection data is uploaded to the transmitter after the detection is completed, so that the purpose of accurately detecting the concrete is achieved.

The utility model discloses an experimental device, which comprises a test piece box, a plurality of test cavities, a plurality of connecting rods, a plurality of connecting rods and a plurality of connecting rods, the salt solution box is provided with a salt storage box, a salt conveying pipe and a plurality of mixed liquid boxes, and the salt conveying pipe is used for conveying chlorate and sulfate to each mixed liquid box; a plurality of water pumps are arranged, and each test cavity is communicated with the corresponding mixed liquid box through the corresponding water pump; the temperature control device comprises a compression condenser and a heater, the compression condenser is used for refrigerating the test piece, and the heater is used for heating the test piece; and the control system is used for controlling the operation of each component. By arranging the multiple independent test cavities, the multiple independent mixed liquid boxes and the temperature control device, the test device has multiple test function modes, in addition, under different function modes, different temperature parameters can be controlled through the temperature control device, the actual road environment can be better simulated, and the accuracy of test results can be ensured to a great extent.

This invention discloses a process for preparing chlorides by reducing chlorination with rare metal oxides, comprising the following steps: S1, in an inert atmosphere, a mixture containing rare metal oxide powder, a reducing agent, and a chloride salt is subjected to a reduction reaction at a predetermined temperature 1; S2, the temperature is lowered to a predetermined temperature 2, oxygen is introduced, and the concentration of oxygen in the mixed gas is adjusted to carry out a chlorination reaction, and the chlorinated product is condensed and collected. This invention eliminates the need for gaseous chlorinating agents such as chlorine or hydrogen chloride, avoiding the leakage risks of liquid chlorine and compressed hydrogen chloride during storage and transportation; the raw materials can be directly rare metal oxides, with a wide range of sources, good process adaptability, and significantly reduced production costs.

The invention provides a preparation method of a chlorine salt conversion film with high corrosion resistance, which comprises the following steps: dissolving manganese chloride and calcium chloride in water, then adding ammonium dihydrogen phosphate, sodium nitrate and EDTA (Ethylene Diamine Tetraacetic Acid), and carrying out conversion treatment to obtain a conversion film solution containing free Mn < 2 + > and Ca < 2 + > and Mn < 2 + > and Ca < 2 + > complexed by EDTA; placing the conversion film solution in a water bath kettle with the temperature of 50-60 DEG C for heating and heat preservation; the magnesium alloy is put into a conversion film solution, monohydrogen phosphate of Mn < 2 + > preferentially nucleates and grows to form a high-thickness film layer, then monohydrogen phosphate of Mn < 2 + > and Ca < 2 + > complexed by EDTA preferentially performs targeted nucleation at the defect position of the film layer, and a conversion film with high thickness and density is formed on the surface of the magnesium alloy. According to the preparation method of the chlorine salt high-corrosion-resistance conversion film, the preparation cost is low, and the prepared film layer is thick and uniform.

This invention provides a method for synthesizing sodalite from 4A zeolite and simultaneously solidifying radioactive waste salts in situ, belonging to the field of radioactive waste salt solidification treatment technology in the dry reprocessing of spent fuel. The invention involves mixing 4A zeolite powder, radioactive waste salts, alkali metal chloride salts, and a dispersant at a specific liquid-to-solid ratio, followed by heating and drying to obtain a solidification precursor. The precursor is then ground, sieved, and sintered at temperatures not exceeding 900°C to obtain a solidified sodalite body. The method provided by this invention features low energy consumption, simple operation, low 4A zeolite usage, high radioactive waste salt coating rate, and high radioactive element fixation. The synthesized solidified sodalite body exhibits strong thermal stability and high mechanical hardness, with a normalized leaching rate of less than 5 x 10⁻⁶ after soaking in water at 90°C for 28 days. ‑ 4 g / (cm 2 ·d) The sodalite solidified body of the present invention can be geologically stored for a long time, effectively reducing the risk of migration, diffusion and leakage of radioactive materials.

The invention relates to the technical field of building materials, and discloses a hydrophobic modification method of chlorine salt polluted recycled aggregate and a preparation method of chlorine-sealing rib-protecting recycled concrete applying the hydrophobic modification method. The hydrophobic modification method of the chlorine salt-polluted recycled aggregate comprises the following steps: dipping the chlorine salt-polluted recycled aggregate in a silane emulsion diluent, taking out the chlorine salt-polluted recycled aggregate, and airing the chlorine salt-polluted recycled aggregate to complete hydrophobic modification of the chlorine salt-polluted recycled aggregate. Compared with unmodified recycled aggregate, the chlorine salt polluted recycled aggregate modified by the method provided by the invention has the advantages that the hydrophobic capacity is better, and the dissolution amount of water-soluble chloride ions is lower. The invention further discloses a preparation method of the chlorine-sealing rib-protecting recycled concrete, the chlorine-sealing rib-protecting recycled concrete comprises the following components: 300-500 parts of cement, 600-700 parts of sand, 1000-1100 parts of hydrophobic modified recycled aggregate and 1-3 parts of a water reducing agent, and the water-cement ratio is controlled to be 0.35-0.55. The method has the advantages that the durability of the recycled concrete member prepared from the chlorine salt polluted recycled aggregate is enhanced, and the utilization rate of the chlorine salt polluted recycled aggregate is increased.

Hydration of a larynx and / or vicinity with a composition comprising a salt formulation (e.g., CaCl2, MgCl2, KCl and / or NaCl) can achieve prophylactic and / or therapeutic effects (e.g., cough suppression, improving voice quality, increasing pulse oxygen saturation and / or increasing mucosal vaccination effectiveness). The composition is administered as dry particles (e.g., aerosol) or as a liquid (e.g., solution, aerosol). The liquid can have a pH of 7.0 up to around 10.0, or preferably around 7.5 up to around 9.5, or more preferably around 8.0 up to around 9.0, or even more preferably 8.0 to 8.5 or most preferably around 8.0. The droplets can have a mass median aerodynamic diameter from approximately 8 μm to approximately 15 μm or from approximately 15 μm to approximately 500 μm. A therapeutic dose (e.g., 0.5 mg to 4.0 mg mass of salt) is administered in response to an indication. Such can employ an osmolitically active composition.

The application discloses a movable assembled construction sand purification device and system, and belongs to the field of construction sand purification. The sand cleaning equipment is integrated into movable modules according to different functions, and the modules are combined according to process requirements. When used, the modules can be combined, and part of the modules can be reused. Various functional devices are respectively integrated and installed in a box, the box can be transported to a use site by a transport tool, and can be used after unloading and hoisting. Different combination modes can be adopted according to different properties of sand, such as machine-made sand, sea sand or river sand, to form a purification system. The purification system can effectively remove the edges and corners of machine-made sand, needle-shaped sand and weathered layers on the surface of sand particles, effectively remove the chloride salt (chloride ion content can reach 0.000% to 0.002%) and other harmful substances of sea sand, reduce the sea sand into the state of river sand before entering the sea, and can be safely used like river sand, so that the reinforcement corrosion and the deterioration of concrete are avoided.

A system for wastewater treatment employing in-situ cleaning of electrodes, comprising: at least one reactor for treating wastewater, said wastewater comprising chloride salts (sodium chloride, potassium chloride, calcium chloride, etc.) with a chloride concentration between 500 mg / L to 5,000 mg / L; and a controller for controlling the current supplied to the reactor by controlling the electrode active area and / or current density, such that the total amount of aqueous free chlorine produced during the wastewater treatment requires the addition of a certain amount of sodium bisulfite determined experimentally to produce a treated wastewater with a concentration of hydrochloric acid between 500 mg / L and 5,000 mg / L and a pH less than or equal to 4. After the addition of sodium bisulfite in the treated wastewater, the wastewater is recirculated back into the reactor. This ensures in-situ cleaning of the electrodes within the electrochemical reactor without the need for any additional equipment.

This application discloses an apparatus and method for preparing Ti3O5 powder materials. Belonging to the field of oxide functional powder material preparation technology, the method utilizes TiO2 powder as raw material, sodium chloride-potassium chloride-calcium chloride as electrolyte, zinc and / or tin as cathode, and a graphite rod as anode. A sandwich-type electrolysis system of "zinc-tin-TiO2 powder-chloride salt" is constructed through density differences to directly electrolyze TiO2 powder to prepare Ti3O5 powder materials. This apparatus and method significantly shorten the traditional Ti3O5 powder material preparation process, and the zinc-tin cathode and electrolyte can be reused, greatly reducing costs. The electrolysis process involves few side reactions, is environmentally friendly, and emits no harmful substances, resulting in high-purity Ti3O5 powder materials.

The invention discloses a method for preparing rare earth hydroxide from alkali metal hydroxide and recycling the rare earth hydroxide, which comprises the following steps: (1) mixing an alkali metal hydroxide solution and a rare earth chloride salt solution and reacting, after the reaction is finished, carrying out solid-liquid separation to obtain a precipitate and a mother solution, and washing the precipitate to obtain the rare earth hydroxide and a washing solution; (2) carrying out impurity removal and concentration on the mother liquor, and then electrolyzing to obtain an alkali metal hydroxide solution, Cl2 and H2; returning the obtained alkali metal hydroxide solution to the step (1), and recycling the alkali metal hydroxide solution as a precipitant; and (3) the Cl2 and H2 in the step (2) react to obtain hydrochloric acid, the hydrochloric acid is used for reverse extraction of the loaded organic phase to obtain a rare earth chloride salt solution, and the step (1) is returned. According to the method, the rare earth hydroxide can be obtained, and comprehensive recycling of the alkaline precipitant, the wastewater and the regenerated acid is realized.

The utility model discloses a waste glass sand geopolymer concrete chemical corrosion resistance experiment device which comprises a soaking pool and a control panel installed on the side face of the soaking pool, a plurality of soaking cavities are formed in the soaking pool and distributed in an array shape, placing boxes are arranged in the soaking cavities, and the placing boxes are arranged in the soaking pool. The top of the containing box is open, a plurality of liquid inlets are formed in the lower portion of the side face of the containing box, and a positioning frame is installed on the upper side of the soaking pool. According to the chemical corrosion resistance experimental device for the waste glass sand geopolymer concrete, soaking and detection are integrated, the soaked concrete does not need to be moved by personnel, and the mechanical property of the concrete can be detected in time after the concrete is taken out of chemical liquid, so that the influence of sulfuric acid and chlorine salt on the concrete can be conveniently tested; and the experimental device is convenient for setting a plurality of experimental control groups, so that chemical solutions with various concentrations can be conveniently subjected to control tests.