50 results about "CALCIUM HYDROXIDE SOLUTION" patented technology

The invention relates to the technical field of gypsum fiberboard raw material treatment, in particular to a plant fiber for a gypsum fiberboard and a preparation method and application thereof. Compared with the prior art, the preparation method provided by the invention adopts specific process steps, plant fiber raw materials are softened by using a supersaturated calcium hydroxide solution to partially remove lignin, the treated plant fiber slurry is introduced into a sulfuric acid solution for neutralization in the water washing process, and generated nano-scale calcium sulfate particles are attached to the surfaces of the plant fibers, so that the surface of the plant fibers is uniform. The plant fiber coagulant plays a role of a coagulant during production of the gypsum fiberboard, and the plant fiber meeting the requirements of production of the gypsum fiberboard is prepared. The preparation method provided by the invention is low in cost, and the gypsum fiberboard prepared from the obtained plant fiber for the gypsum fiberboard has relatively high mechanical property indexes and meets the performance requirements of boards for building decoration.

The utility model discloses an ammonium sulfate wastewater treatment system which comprises an ammonium sulfate wastewater storage pool used for collecting ammonium sulfate wastewater, the calcium hydroxide preparation system is used for preparing a calcium hydroxide solution, an evaporator and a first circulating heater and is used for reacting ammonium sulfate wastewater and calcium hydroxide and heating and evaporating; the first crystallizer and the second circulating heater as well as the second crystallizer and the third circulating heater are used for two times of evaporative crystallization, a final concentrated solution is filtered by the filter and then flows into the mother liquor collecting tank to facilitate wastewater treatment, and evaporated ammonia gas is absorbed by the cooling absorption tower and the condensate collecting tank to form ammonia water; and condensate water of the second heat exchanger, the first circulating heater, the second circulating heater and the third circulating heater also flows back to the condensate collecting pool. According to the wastewater treatment system, ammonium sulfate wastewater and a calcium hydroxide solution are distilled and crystallized, so that calcium sulfate and ammonia water can be recovered, and waste utilization is realized.

The invention discloses a calcium-based incrustation deposition experimental device and experimental method. The device comprises a reaction container, a sensor module, a control unit, an automatic solution supply device and a carbon dioxide gas supply unit. The sensor module monitors the pH value of the reaction liquid and the concentration of calcium hydroxide in real time; the control unit receives the data and compares the data with a preset threshold value to control the supply device to automatically add the calcium hydroxide solution so as to maintain the stability of chemical parameters; gas is introduced into the carbon dioxide supply unit at a controllable flow rate. The experimental method comprises the following steps: setting and initializing parameters; starting constant temperature and gas introduction; the system automatically runs, and the conditions are kept stable through real-time monitoring, threshold comparison and automatic supply; and after the experiment is finished, sampling and analyzing the sediment, and exporting process data for analysis. According to the method, the problems of parameter drift and frequent manual intervention in a traditional method are solved, and the repeatability and automation level of experiments and the scientificity of data are remarkably improved.

This invention relates to the field of exhaust gas treatment technology, and more particularly to an exhaust gas treatment device for steel tailings treatment. The device includes a base plate, a workbench on top of the base plate, a support on top of the workbench, and a mounting shell on the left side of the top of the support. A first pipe is mounted on the mounting shell, and a second pipe is connected to the right side of the first pipe. The dust removal component of this device uses a servo motor-driven rack and pinion transmission to achieve dynamic switching of multiple filter plates. This allows for the replacement of clogged filter plates without stopping the machine, ensuring continuous dust removal operations. Simultaneously, the double-layer filtration structure improves the interception effect of large particulate impurities. The jet stirring component, in conjunction with the drive component, enables the three treatment chambers to rotate and stir synchronously, ensuring full contact between the exhaust gas and the calcium hydroxide solution. This significantly increases the acid-base neutralization reaction rate, reduces the residue of pollutants such as calcium sulfite and lead hydroxide, and improves the exhaust gas purification effect.

The invention discloses a hydrogen resistance and anti-oxidation method for the inner walls of a pressure container, a bottle, a pipeline and a valve, which comprises the following steps of: (1) performing sand blasting or internal grinding treatment on the surface of the inner wall of a high-pressure hydrogen storage container, and removing oxide skin; (2) vacuumizing the treated container to 0.1-1.0 MPa or replacing with N2, and introducing a mixed gas composed of 75-85% by volume of fluorine and 15-25% by volume of nitrogen; (3) rotating the container at a constant speed of 5-20 revolutions per minute for 30-120 minutes, so that the mixed gas is uniformly attached to the surface of the inner wall to form a fluoride protective film; and (4) standing for 24 hours, exhausting gas, and introducing the exhausted gas into a calcium hydroxide solution at 20-60 DEG C to react to generate marble. According to the 30CrMo steel treated through the method, after a 72-hour hydrogen permeation test, the corrosion rate is reduced to 0.01 mm / a or below, and the hydrogen permeability is reduced by 92%; the tensile strength retention rate of the substrate is greater than or equal to 95% and is superior to that of a high- The friction coefficient of the fluoride film is less than or equal to 0.1 and is obviously reduced compared with nickel-plated Marble generated from tail gas can be recycled, and fluorine-free gas is directly discharged.

This invention discloses an ammonium sulfate wastewater treatment system and method, comprising an ammonium sulfate wastewater storage tank for collecting ammonium sulfate wastewater; a calcium hydroxide preparation system for preparing calcium hydroxide solution; an evaporator and a first circulating heater for reacting and evaporating the ammonium sulfate wastewater and calcium hydroxide; a first crystallizer and a second circulating heater, a second crystallizer, and a third circulating heater for two-stage evaporation and crystallization; the final concentrated liquid is filtered and flows into a mother liquor collection tank for convenient wastewater treatment, while the evaporated ammonia gas is absorbed by a cooling absorption tower and a condensate collection tank to form ammonia water; the condensate from the second heat exchanger, the first circulating heater, the second circulating heater, and the third circulating heater is also returned to the condensate collection tank. This wastewater treatment system and method distill and crystallizes ammonium sulfate wastewater with calcium hydroxide solution, thereby recovering calcium sulfate and ammonia water, thus achieving waste utilization.

The invention relates to the technical field of inorganic salt mother liquor treatment, in particular to an inorganic salt mother liquor recycling system based on MVR evaporative crystallization, which comprises three groups of sedimentation tanks and separation cylinders fixedly communicated with the bottoms of the sedimentation tanks, stirring components and sealing conical seats are arranged in the separation cylinders, and the tops of the sedimentation tanks are connected with liquid storage hoppers through liquid inlet pipes. An electromagnetic control valve is arranged on the liquid inlet pipe, and a calcium hydroxide solution, a sodium carbonate solution and a barium chloride solution are sequentially arranged in the multiple liquid storage hoppers from left to right; through staged treatment of the three groups of sedimentation tanks, the ion selective electrode sensor and the controller are combined to precisely add corresponding agents, the hetero ions are removed step by step in a targeted manner, and the subsequent progressive deep purification treatment is matched, so that a high-quality water quality basis is provided for efficient recycling of the mother liquor; and the problems of crystal quality reduction, equipment scaling and the like caused by hetero-ion enrichment are effectively avoided.

The application relates to the technical field of flue gas desulfurization, and discloses a full-oxygen combustion glass melting furnace flue gas desulfurization device, which comprises a mounting plate, a plurality of purification boxes are fixedly connected to the top of the mounting plate, the device is used for feeding flue gas into the purification boxes, then spraying atomized calcium hydroxide solution into the purification boxes, so that the calcium hydroxide solution is fully and sufficiently sprayed, the sulfur dioxide in the flue gas is ensured to fully contact and react with the calcium hydroxide solution, meanwhile, the transmission shaft drives the transmission screw rod to rotate, the airflow in the purification box is disturbed, the mixing and contact of the flue gas and the calcium hydroxide solution are further promoted, in the spraying process, the electric telescopic rod drives the extrusion plate to extrude the gas in the purification box to the middle, the pressure in the purification box is increased, the flow of the calcium hydroxide solution and oxygen is accelerated, and more sufficient reaction is promoted, so that the sulfur dioxide in the flue gas is efficiently purified and removed.

The invention relates to an earthen archaeological site loose soil body disease strengthening method, and relates to the field of archaeological site soil body protection and restoration. An earthen archaeological site loose soil body disease strengthening method comprises the following steps that a calcium hydroxide solution is injected into a loose soil body, and preliminary cohesive soil is obtained after standing; uniformly spraying a silicate solution on the surface of the primary binding soil, repeatedly spraying for three times, and standing to obtain binding soil; in-situ silty soil of loose soil is evenly sprayed on the surface of the binding soil, the binding soil is covered and then stricken off, and solidified soil is obtained after drying. A calcium hydroxide solution reacts with carbon dioxide to generate a calcium carbonate crystal'cementation bridge ', insoluble calcium salt is formed through ion exchange, a stable framework is built from the inside, and migration of soluble salt is inhibited; the silicate solution forms a silicon-oxygen network reinforcing film with stable chemical properties through a sol-gel reaction, external erosion is prevented, and meanwhile, the silicate solution and calcium carbonate crystals are interwoven to reinforce a structure; therefore, long-term influence of natural environment is effectively resisted, and soil strength is maintained.

This invention discloses a method for the utilization of gas field water resources, specifically including the following steps: Step 1, gas field water treatment: adjusting the pH value to 11-12. Step 2, filtration: solid-liquid separation to obtain precipitate and treated gas field water. Step 3, electrolysis: the gas field water treated in Step 2 undergoes ion-exchange membrane electrolysis to obtain chlorine and hydrogen gas. Step 4, calcination: calcining the precipitate from Step 2 to constant weight. Step 5, dissolution: dissolving in water after calcination. Step 6, filtration: solid-liquid separation to obtain strontium carbonate precipitate and calcium hydroxide solution. Step 7, CO2 introduction: the calcium hydroxide solution reacts with CO2 to obtain calcium carbonate precipitate. This method achieves effective utilization of gas field water resources.

The application relates to the technical field of building materials, and discloses a preparation method of maintenance-free concrete, and the specific steps are as follows: S1. binding steel bars, wherein the steel bars are provided with porous steel pipes, and the porous steel pipes are filled with water-saturated sand washing or water-absorbing resin; S2. erecting a concrete heat insulation template; S3. spraying silica sol or saturated calcium hydroxide solution on the surface of concrete aggregates, and pouring concrete, wherein the concrete contains fiber tubes, cellulose and cellulose fibers; and S4. after the concrete is poured and initial setting, before final setting, spraying a concrete protective layer material on the surface of the concrete, and then carrying out second-time troweling and light receiving. The application solves the problem that the performance of the concrete is greatly reduced when the maintenance condition is not met.

The application discloses a kind of desulfurization wastewater and sintering dust's collaborative processing method, including s1, after mixing stirring of sintering dust and desulfurization wastewater, solid-liquid separation is carried out, and supernatant separated is treated to remove hardness;S2, after treating to remove hardness, flocculation, precipitation treatment is carried out, and the filtrate of the sludge of precipitation and the supernatant of precipitation unit are filtered and then treated by brine conditioning tank, then enter pH adjusting tank, finally, evaporation crystallization is carried out to obtain potassium chloride and sodium chloride crystalline salt, the reagent of the reagent for treating to remove hardness is prepared into solution using water in brine conditioning tank;Flocculation treatment is prepared into solution using condensate produced by evaporation crystallization;Calcium hydroxide solution and sodium carbonate solution are prepared using water in brine conditioning tank, and flocculant solution is prepared using condensate in evaporation crystallization unit, not only save the use of fresh water, but also use the residual alkalinity generated by the excess of dosing amount of hardening-removing reagent, and the dosing amount of hardening-removing reagent is further saved by pH feedback control.

The application discloses a soil solidification method and belongs to the field of road engineering. The solidification method comprises the following steps: S1, performing particle size analysis on undisturbed soil to determine the weight proportion of gravelly soil, sandy soil, fine-grained soil and clay soil; S2, determining the adding amount of gravelly soil additive, sandy soil additive, fine-grained soil additive and clay soil additive, so that the weight proportion of gravelly soil, sandy soil, fine-grained soil and clay soil in the solidification system reaches (0.1-2.0):(1.0-5.0):(82.0-86.0):(10.0-15.0); and S3, mixing the gravelly soil, sandy soil, fine-grained soil and clay soil in proportion, mixing the mixture with an appropriate amount of liquid material, and uniformly mixing the mixture, and then standing or compression molding to complete soil solidification, wherein the liquid material is a calcium hydroxide solution. Compared with the prior art, the soil solidification method can form a soil solidification system with good later strength and water stability, and can be widely applied to the field of road base and cushion paving.

The present application relates to a kind of high hardness micro-polluted water synchronous purification system and purification method.The present application includes total inlet pipe, for providing high hardness micro-polluted water;Hardness removal synchronous catalytic oxidation unit, in communication with total inlet pipe, hardness removal synchronous catalytic oxidation unit is provided with main inlet, mixed push flow ware, micro-nano bubble secondary cutter, effluent overflow tank;Calcium hydroxide storage pool, for providing calcium hydroxide solution;Gas-liquid synchronous pressurizing pump and ozone generator, ozone generator is in communication with the gas inlet end of gas-liquid synchronous pressurizing pump, the water inlet end of gas-liquid synchronous pressurizing pump is in communication with total inlet pipe, the water outlet end of gas-liquid synchronous pressurizing pump is in communication with micro-nano bubble secondary cutter;Induced crystallization filter unit, is provided with induced crystallization filter material;Alkaline back adjustment unit, is provided with adjust alkali mixed push flow ware and carbon dioxide aeration disc;Carbon dioxide generator, in communication with alkaline back adjustment unit.The present application can remove the problem of hardness and trace organic pollutants simultaneously at low cost and safely.

The utility model relates to the technical field of wastewater treatment, in particular to a reaction device for treating hypophosphorous acid by a potassium permanganate method, which comprises a hypophosphorous acid sewage treatment tank, a calcium hydroxide solution adding device used for adding a calcium hydroxide solution is arranged over the middle portions of the partition supporting plates, an anti-precipitation stirring device is arranged in the calcium hydroxide solution adding device, and the multiple partition supporting plates are arranged in an X-shaped crossed mode. According to the present invention, the multiple key assemblies and structures are designed to optimize the calcium hydroxide solution adding and mixing process, such that the precipitation effect is improved, and the wastewater treatment efficiency is improved.

The utility model discloses a device capable of automatically controlling and measuring the concentration of a calcium hydroxide solution, which comprises a configuration tank, a stirring device, an automatic control device, an automatic control device and an automatic control device, and is characterized in that a stirrer is arranged in the configuration tank, and a top feed port is connected with a bottom discharge port of a calcium oxide hopper; the rotor flow meter is arranged on the desalted water feeding pipeline at the top of the configuration tank; the radar liquid level meter is arranged on the preparation tank; the inlet end of the sampling tank is provided with a mass flow meter, the mass flow meter is connected with a sampling opening in the bottom of the preparation tank through a first alkali liquor pump, and the outlet end of the sampling tank is connected with a liquid return opening in the side wall of the preparation tank through a second alkali liquor pump; the inlet end of the storage tank is connected with a liquid conveying opening in the bottom of the configuration tank through a third alkali liquor pump.

The utility model relates to the technical field of flue gas treatment after a desulfurizing tower, in particular to a system for capturing carbon dioxide in post flue gas, which comprises an absorption tower, the rear flue gas conveying mechanism is arranged between the desulfurization tower and the absorption tower; the alkali liquor conveying mechanism is used for conveying an alkali solution into the absorption tower to form an absorption solution; the absorption liquid spraying mechanism is used for absorbing the absorption liquid, spraying the absorption liquid out of the absorption tower and making contact with the rear flue gas to form rich liquid; the pH detection unit is arranged in the absorption tower; an acid liquor conveying mechanism; a reaction tank; the calcium hydroxide conveying mechanism is used for conveying a calcium hydroxide solution into the reaction tank; the rich solution conveying mechanism is used for conveying the rich solution in the absorption tower to the reaction tank and reacting the rich solution with the calcium hydroxide solution to obtain a reaction tank product; the centrifugal machine is used for separating reaction tank products. According to the invention, acidic wastewater and alkaline wastewater generated after a resin regeneration process can be recycled in a boiler water supply system, and meanwhile, carbon dioxide in post-flue gas can be captured and utilized.

The invention belongs to the technical field of active substance extraction, and particularly relates to a method for extracting alkaloid from leaves. The method for extracting alkaloid from leaves provided by the invention comprises the following steps: (1) mixing a crushed leaf raw material with a calcium hydroxide solution to obtain a mixed material; mixing the mixed material with limonene, soaking, and centrifugally separating to obtain a mixed solution of which the residue content is less than 2wt%; (2) mixing the mixed solution with the slag content of less than 2wt% with acetic acid, and then heating to react; after the reaction, separating from the lower layer of the obtained liquid to obtain a solution containing alkaloid; and filtering, crystallizing and drying the solution containing the alkaloid to obtain the alkaloid. According to the method, limonene is adopted for soaking in the alkali environment, then acetic acid is adopted as an extraction solvent, damage to alkaloid can be reduced, interference of impurities to alkaloid separation is avoided, the extraction rate and purity of alkaloid are effectively improved, and the method has wide application prospects in the field of alkaloid extraction.

The application relates to the technical field of sewage treatment, in particular to a carbon source for sewage treatment and a preparation method and application thereof. The preparation method of the carbon source for sewage treatment comprises the following steps: (1) crushing and drying wheat straw and reed straw, soaking in a calcium hydroxide solution, filtering, washing with deionized water until neutral, and drying to obtain plant materials; (2) stirring polyvinyl alcohol and modified chitosan in water, then adding the plant materials in step (1) to obtain a mixed solution, adding a glutaraldehyde aqueous solution for crosslinking to obtain solution A; (3) dispersing functional fillers in water to obtain solution B, adding the solution B into the solution A obtained in step (2), uniformly mixing, and freeze-drying to form, and the carbon source is obtained. The carbon source can continuously and stably provide carbon sources, has good denitrification effect and heavy metal ion removal effect in sewage treatment, has good compressive strength, and can meet the actual application requirements.

The invention relates to the technical field of salt manufacturing brine purification, in particular to a calcium type brine coupling synthesis ammonia low-A tail gas purification process which comprises the following steps: pumping raw brine from a mine and mother liquor returned by a salt manufacturing workshop into a primary reaction clarification tank, adding sodium sulfate and a calcium hydroxide solution for reaction, and precipitating Mg < 2 + > and part of Ca < 2 + > in the brine; and pumping the clear liquid into a secondary reaction clarification tank, introducing CO2 tail gas generated by a synthetic ammonia low-temperature methanol washing process to perform carbonization reaction, controlling the reaction endpoint, supplementing sodium carbonate to completely precipitate Ca < 2 + > into calcium carbonate, and clarifying to obtain refined brine. Ammonia synthesis low-temperature methanol washing CO2 tail gas is adopted to replace flue gas of a power plant boiler, and CO2 is provided for salt manufacturing brine purification; and the synthesized low-methane tail gas is relatively high in CO2 content and relatively pure in component, so that the effects of reducing the brine purification cost and recycling CO2 are achieved, and the influence of dust, escaping ammonia, heavy metal ions and the like contained in the flue gas of the power plant boiler on the quality of a salt-making finished product can be avoided.

The utility model discloses a partition reaction device for a calcium hydroxide solution in reversible thermal chemical reaction. The partition reaction device comprises a plurality of partition reaction tubes which are arranged in an array, one end of the partitioned reaction pipe is connected with a calcium hydroxide mixed solution conveying pipe, so that the calcium hydroxide mixed solution is conveyed into the partitioned reaction pipe for continuous exothermic reaction; the other end of the partition reaction pipe is connected with a calcium hydroxide mixed liquid recovery pipe; a cold water pipe and a hot water pipe are further arranged on the partition reaction pipe, cold water is guided into the partition reaction pipe through the cold water pipe for heat exchange, hot water is recycled from the hot water pipe, and continuous heat exchange is formed; compared with an integrated reaction tank, the reaction tank disclosed by the utility model has the advantages that the efficiency of partitioned exothermic reaction is higher, and heat energy can be supplied more quickly; and partial partition reaction pipes can be opened, so that a small amount of hot water is output, and waste is avoided.

The utility model discloses a production system for producing an anti-freezing solution and a dust suppressant by using carbide slag, which comprises a stirring tank, a water adding pipeline arranged on the stirring tank, a metering valve arranged on the water adding pipeline and a calcium chloride solution adding pipeline arranged on the stirring tank, and the calcium chloride solution adding pipeline is connected with a mother liquor precipitation tank through a metering pump and a valve. An inlet of the mother liquor precipitation tank is connected with a calcium carbide slag calcium chloride solution preparation unit, a calcium hydroxide adding pipeline is arranged on the stirring tank and connected with a calcium hydroxide solution storage tank, a metering pump and a valve are arranged on the calcium hydroxide adding pipeline, and other raw material adding pipelines are arranged on the stirring tank. Other raw material adding pipelines are connected with other raw material storage tanks through metering pumps and valves, other raw material storage tanks are also provided with water adding pipelines, and the bottom of the stirring tank is provided with a material outlet pipeline which is connected with an anti-freezing solution or dust suppressant finished product tank. The system is simple in structure, can realize continuous batch production, is environment-friendly and efficient, and achieves the purpose of waste utilization.

The invention relates to the technical field of sewage treatment, in particular to a carbon source for sewage treatment and a preparation method and application thereof. The preparation method of the carbon source for sewage treatment comprises the following steps: (1) crushing wheat straw and reed straw, drying, soaking in a calcium hydroxide solution, filtering, washing with deionized water to be neutral, and drying to obtain a plant material; (2) adding polyvinyl alcohol and modified chitosan into water, stirring, then adding the plant material in the step (1) to obtain a mixed solution, and adding a glutaraldehyde aqueous solution for crosslinking to obtain a solution A; and (3) dispersing the functional filler in water to obtain a solution B, adding the solution B into the solution A obtained in the step (2), uniformly mixing, and carrying out freeze-drying forming, thereby obtaining the product. The carbon source can continuously and stably provide a carbon source, has a good denitrification effect and a heavy metal ion removal effect in sewage treatment, has good compressive strength, and can meet actual application requirements.

This invention relates to the field of inorganic composite materials technology, specifically to a lightweight, flexurally resistant gypsum board reinforced with plant fibers. The plant short fibers used in the gypsum board are impregnated with calcium hydroxide solution and fumigated with sulfur dioxide gas, resulting in an in-situ calcium sulfite / calcium sulfate microcrystalline coating layer on their surface. This enhances the interfacial bonding between the fibers and the gypsum matrix. During preparation, a dry-mixing followed by wet-mixing process ensures component uniformity. A combination of vacuum filtration and hot-pressing is used to achieve rapid dehydration and high-pressure compaction of the slurry. The gypsum board produced by this invention maintains its lightweight nature while exhibiting excellent flexural strength and impact resistance, solving the problem of insufficient mechanical properties in traditional lightweight gypsum boards.

The utility model discloses a sodium sulfate waste salt utilization and treatment system which comprises a dissolving unit, a reaction unit and a recovery unit which are connected in sequence, the dissolving unit comprises a sodium sulfate dissolving device and a calcium hydroxide dissolving device which are respectively used for dissolving waste salt sodium sulfate and calcium hydroxide in a methanol solution; the reaction unit comprises a reaction device connected with the dissolving unit and a separation device used for enabling a sodium sulfate solution to react with a calcium hydroxide solution to generate a sodium hydroxide solution and a calcium sulfate precipitate, and further comprises a separation device connected with the reaction device and used for separating the calcium sulfate precipitate and a filtrate containing sodium hydroxide; the recovery unit comprises a filtrate circulating device, a distillation device and an evaporation device which are connected in sequence, and the evaporation device is used for evaporating and concentrating filtrate to obtain a sodium hydroxide product with target concentration. The sodium sulfate waste salt recycling device realizes effective recycling of sodium sulfate waste salt, has economic value and environmental protection significance, and is suitable for large-scale industrial production.

The utility model relates to the technical field of carbonization reaction equipment, and discloses nano calcium carbonate continuous carbonization reaction equipment which comprises a reaction mechanism, and a temperature control mechanism is arranged at the bottom end of the reaction mechanism. According to the continuous carbonization reaction equipment for the nano calcium carbonate, a calcium hydroxide solution is input through the liquid conveying pipe and atomized through the atomizing spray head, carbon dioxide guided in through the gas conveying pipe is diffused through the gas conveying spray head, gas-liquid two-phase full contact is achieved, calcium carbonate precipitates are generated, the precipitates are intercepted to the containing cabin through the filter screen, and redundant liquid is discharged through the discharging port; for side reaction, a temperature control medium is input through a liquid inlet of the temperature control mechanism, so that the liquid tank is kept in an environment of 35 + / -2 DEG C, and reverse dissolution of calcium carbonate is inhibited; and the CO2 concentration is adjusted to 8-12 vol%, so that the main and side reaction paths can be directionally regulated and controlled, the yield of nano calcium carbonate is ensured to be more than 95%, and the production of calcium bicarbonate can be switched.

The invention provides calcite type rod-like calcium carbonate lubricating grease and a preparation method thereof, and belongs to the technical field of lubricating grease. The preparation method of the rod-like calcium carbonate lubricating grease comprises the following steps: adding distilled water into calcium hydroxide to prepare a calcium hydroxide solution, then adding a morphology regulating agent, and introducing carbon dioxide gas to carry out carbonation reaction; raising the temperature after the carbonation reaction is finished, adding a surface modifier, continuously stirring and reacting, removing the solvent and impurities after the carbonation reaction is finished, and drying to obtain the calcite type rod-like calcium carbonate. And uniformly mixing the calcium carbonate powder and the base oil, and grinding for 3-5 times to obtain the rod-like calcium carbonate lubricating grease. The produced calcium carbonate lubricating grease is low in cost, simple in preparation process, stable in performance batch and excellent in high-temperature and low-temperature performance, the dropping point of the lubricating grease is higher than 350 DEG C, the low-temperature similar viscosity is lower than 250 Pa.s, and the problems that existing calcium sulfonate lubricating grease is high in manufacturing cost and complex in preparation process, and the high-temperature and low-temperature performance cannot be considered at the same time can be effectively solved.

The application discloses a synthetic device for filtering fire dust and resolving carbon dioxide, which comprises a fire stove body, fire stove parts are installed on the left and right sides of the fire stove body respectively, and are used for providing combustion spaces respectively, so that users can perform cooking operations at different positions; a smoke dust purification and carbon dioxide resolution device is arranged at the rear part of the fire stove body, is used for resolving and treating smoke dust and carbon dioxide generated by the two fire stove parts, and is provided with a smoke dust resolution part and a carbon dioxide resolution part. In the water misting area, particles remaining in the smoke dust are rapidly condensed and adsorbed, the smoke dust particles are increased and the settlement is accelerated, so that the smoke dust separation efficiency is greatly improved. The calcium hydroxide solution (lime water) has certain alkalinity and adsorption capacity, can be combined with acidic components contained in the smoke dust, and is used for misting treatment. The calcium hydroxide solution (lime water) not only can enhance the chemical resolution capacity in the resolution process, but also can further improve the chemical degradation and coagulation settlement effect, so that the smoke dust components are further resolved.

The application relates to a method for preparing high-purity calcium fluoride by fluorine-containing wastewater resource treatment, which comprises the following steps: step 1: taking calcium fluoride as a core, coating an active calcium-based compound on the surface to form a core-shell structure composite seed HAP / CaF2; step 2: adding fluorine-containing wastewater into a stirring kettle, adjusting pH=5-8, adding the composite seed HAP / CaF2, starting stirring to uniformly disperse the seed, adopting a mode of adding calcium hydroxide solution in sections to carry out a crystallization reaction, controlling the Ca / F molar ratio and stirring intensity in different stages to maintain the supersaturation of the reaction system in a metastable zone interval, and inducing calcium fluoride to grow on the surface of the composite seed in a directional mode; step 3: after the crystallization reaction is completed, the reaction liquid is subjected to solid-liquid separation to obtain crude calcium fluoride crystals and a filtrate; and step 4: adding the crude calcium fluoride crystals into HF and washing until neutral, and the product is obtained. The method fundamentally solves the uncontrollable problem in the calcium fluoride crystallization process, greatly improves the product purity and fluorine resource recovery rate, and significantly reduces equipment investment and operation cost.

The utility model provides a kind of municipal sludge compost fermentation produced condensate waste liquid processing system, it is related to condensate waste liquid processing field, including mixed sedimentation tank, ozone reaction device, dilution tank, and mixed sedimentation tank is equipped with dosing opening, sewage inlet, condensate waste liquid enters into mixed sedimentation tank from sewage inlet, and reagent is added to mixed sedimentation tank by dosing opening, and the reagent is added is calcium hydroxide solution, and the sewage outlet of mixed sedimentation tank is connected by pipeline and the water inlet of ozone reaction device, and the water outlet of ozone reaction device is connected by pipeline and the water inlet of dilution tank;After reaction and deposition, sludge is entered into the feed end of sludge compost system by sludge outlet;Sewage and tail water addition ratio in dilution tank are 1:10+;Beneficial effect: the liquid after processing of the application is used as supplementary nitrogen fertilizer and garden greening water is mixed and irrigated, and the generated precipitate is used for compost fermentation to enhance sludge fertility, and the application achieves the purpose of source treatment and the treatment process is simple.