111 results about "Limewater" patented technology

The invention discloses 3D printing low-carbon concrete containing modified recycled aggregate and a micro-powder reinforcer. The 3D printing low-carbon concrete is prepared by the following steps: (1) putting recycled concrete coarse aggregate into sodium or potash water glass, and performing ultrasonic treatment; then separating the coarse aggregate, performing carbonization treatment, and heating the obtained coarse aggregate to obtain the pretreated recycled aggregate. And (2) placing the pretreated recycled aggregate in saturated lime water, and carrying out heating and heat preservation treatment to obtain the modified recycled aggregate. And (3) forming a wet material from the waste cement slurry powder, gamma-C2S powder and water, performing carbonization treatment on the wet material, performing heating treatment, and grinding the obtained solid to obtain the modified regenerated micro-powder enhancer. And (4) uniformly mixing the cement, the modified recycled aggregate, the fine aggregate, the micro-powder enhancer, the water reducing agent and the water to obtain the concrete. The process provided by the invention not only improves the mechanical strength and fluidity of the 3D printing concrete prepared from the recycled concrete aggregate, but also consumes carbon dioxide and reduces carbon emission.

The invention relates to the technical field of concrete structure repair, and particularly discloses a high-freezing-resistance and high-permeability concrete crack repair material and a preparation process thereof. The repairing material comprises the following components in parts by weight: 10-50 parts of acrylic acid, 12-50 parts of methyl methacrylate, 0.2-3.0 parts of a cross-linking agent, 0.05-2 parts of an oxidizing agent, 0.01-1 part of a reducing agent and 2-10 parts of watermelon leaf powder-saturated lime water suspension. The repairing material disclosed by the invention not only has good permeability, can penetrate into microcracks, but also has good frost resistance, so that the repairing material can be well applied to repairing of weight cracks of a concrete structure in a low-temperature environment.

The invention discloses a comprehensive utilization method of high-salinity wastewater produced by hydrometallurgical treatment of bastnaesite, which comprises the following steps: A, mixing alkaline wastewater and acidic wastewater, neutralizing and clarifying to obtain calcium fluoride and sodium chloride wastewater; b, mixing the sodium chloride wastewater with the precipitation wastewater, adding lime water in an aeration manner to adjust the pH value, hydrolyzing heavy metal ions in the wastewater, and performing solid-liquid separation to obtain filter residues and filtrate which is sodium chloride high-salinity wastewater; and C, adding oxalic acid into the sodium chloride high-salinity wastewater, stirring, standing, carrying out solid-liquid separation, pressurizing, concentrating, recovering hydrochloric acid, and crystallizing to obtain a crystal substance, namely a sodium chloride product. According to the method, fluorine in the wastewater is removed firstly, then the wastewater is recovered into wastewater containing sodium chloride, oxalate is dissolved into the high-salinity wastewater to separate out sodium oxalate and recover hydrochloric acid, so that the content of sodium chloride in the system is greatly reduced, and the recovery efficiency of sodium ions in the wastewater is improved.

The invention discloses a preparation process of a high-strength anti-crack and anti-seepage vertical shaft lining concrete material, which comprises the following steps: (1) uniformly mixing aggregate with a solution containing copper ions, drying to remove moisture, dropwise adding saturated lime water containing alkaline substances into the mixture, and drying to remove moisture to obtain pretreated aggregate; and (2) the pretreated aggregate is placed in a carbon monoxide atmosphere for reduction treatment, the reduction temperature is higher than the melting point of copper, and the surface modified aggregate is obtained after reduction treatment is completed. The surface modified coarse aggregate and the surface modified fine aggregate are respectively prepared according to the method. And (3) uniformly mixing the cement binding material, the surface modified coarse aggregate, the surface modified fine aggregate, the modified fiber, the solid waste-based powder filler, emulsified asphalt and a water reducing agent, adding mixing water, and uniformly mixing to obtain the concrete material. The concrete material disclosed by the invention has good mechanical strength and crack resistance and also has good water seepage resistance, and the service life of the pumped storage power station vertical shaft is effectively prolonged.

The invention discloses an industrial waste gas treatment device for thermal power generation, and relates to the technical field of waste gas treatment.The industrial waste gas treatment device for thermal power generation comprises a treatment tank, a gas outlet plate is fixedly installed at the top of the treatment tank, a motor is fixedly installed at the top of the gas outlet plate, and a gas inlet pipe fixedly penetrates through the surface of the treatment tank; according to the industrial waste gas treatment device for thermal power generation, lime water is thrown out through filter holes formed in the surface of the centrifugal barrel by centrifugal force through rotation of the centrifugal barrel, precipitates are accumulated at the bottom of the centrifugal barrel, and the precipitates are subjected to centralized treatment by workers; sediments are prevented from being randomly accumulated in the device to influence normal operation of the device, the stability and safety of the device are guaranteed, the service life of the device is prolonged, meanwhile, accumulation of the sediments on key components is reduced, and the fluid conveying efficiency is improved.

The present invention discloses a non-fired γ-C2S phosphogypsum lightweight aggregate, and its components and their mass percentages are as follows: phosphogypsum 43-68%, γ-C2S 12-28%, fly ash 5-10%, mineral powder 5-10%, red mud powder 3-6%, sodium metaaluminate 1-3%, water 5-7%; First, the weighed phosphogypsum, γ-C2S, mineral powder, fly ash, red mud powder, sodium metaaluminate and water are stirred and mixed; Then, through step-by-step pressing, crushing, rounding treatment and screening, aggregate blanks are obtained; Finally, they are cured in saturated lime water to obtain the product. The γ-C2S phosphogypsum lightweight aggregate obtained by the present invention has a low self-weight and high strength, can realize the high-value resource utilization of industrial wastes such as phosphogypsum, and has significant environmental and economic benefits.

The utility model relates to the technical field of boilers, in particular to wet desulphurization equipment for boiler flue gas waste heat recovery, which comprises a boiler body, a circulating water tank, supporting legs, a water pumping pipe and a stirring and mixing device, the stirring and mixing device comprises a stirring shaft, stirring blades, a driving assembly and an auxiliary assembly, and the stirring shaft is rotatably connected with the boiler body. The stirring blades are fixedly connected with the stirring shaft, the driving assembly is arranged on the boiler body, the auxiliary assembly is arranged on the boiler body, and in the desulfurization process of the boiler body, when lime water is added into the boiler body for desulfurization, the driving assembly is started, the driving assembly drives the stirring shaft to drive the stirring blades to rotate in the boiler body, and the stirring blades rotate in the boiler body. The lime water is stirred and mixed by the stirring blades, so that the lime water in the boiler body can be stirred and mixed, the lime water in the boiler body is fully stirred, precipitation is avoided, the lime water is effectively utilized, and the desulfurization cost is reduced.

The invention discloses an environment-friendly plant-based fire extinguishing agent as well as a preparation method and application thereof, and the environment-friendly plant-based fire extinguishing agent comprises the following components in percentage by weight: 1%-5% of metal salt, 1%-5% of a high nitrogen and phosphorus compound, 0.1%-3% of a surfactant, 0.01%-0.1% of a foam stabilizer and the balance of fireproof wood flour fermentation liquor, the fireproof wood powder fermentation liquor is obtained by adding 2%-5% lime water which is 2-5 times of the weight of the fireproof wood into fireproof wood powder to be soaked and fermented for more than 48 hours. The environment-friendly plant-based fire extinguishing agent provided by the invention is prepared by adopting fire-retardant forest plants as raw materials through fermentation, chelation and nanocrystallization treatment, has better anti-after-combustion and foaming effects, does not cause environmental pollution compared with a traditional flame-retardant fire extinguishing agent, and is biodegradable and safer.

The utility model discloses a combined acid fluoride wastewater lime crystallization tower device, which is characterized in that a reactor sequentially forms a mixing area, a first-stage defluorination area, a second-stage defluorination area and a water outlet area from bottom to top, an acid fluoride wastewater inlet system can feed acid fluoride wastewater into the mixing area of the reactor, and a lime dosing system can feed a lime medicament into a lime diluting device for dilution; the lime diluting device can feed diluted lime water into the mixing area of the reactor, and the calcium chloride dosing system can add a calcium chloride agent into the reactor to enable the calcium chloride agent and the wastewater subjected to the primary defluorination reaction to be subjected to secondary defluorination reaction; the reflux dilution system can feed water subjected to defluorination in the second-stage defluorination area in the reactor into the lime dilution device for diluting a lime agent, calcium fluoride crystals generated by reaction in the reactor are discharged through a crystal discharge pipeline at the lower end of the reactor, produced water in the water outlet area is discharged through a water outlet pipe, and the controller controls all the systems to work. The device disclosed by the utility model realizes the recovery of high-quality calcium fluoride resources while ensuring the fluorine removal effect of the wastewater.

The present invention is applicable to the technical field of etching wastewater treatment, and provides an etching wastewater treatment device and treatment method, including a mixing component, a preliminary treatment component, a discharge seat, an electrolytic cell, a second delivery pump and an incubator: the top of the preliminary treatment component is provided with a water inlet component, the top of the discharge seat is movably connected with a filter frame component, and the inner wall of the filter frame component is provided with a filter ball component; through the setting of the mixing component, in use, quicklime powder is poured into the stirring tank, and a certain amount of clean water is added, and the stirring motor is turned on to drive several stirring plates through the stirring rod to stir evenly into lime water slurry, and the bent discharge pipe is opened to discharge it into the slurry storage tank, and then the feed port of the slurry storage tank is closed for standby use; impurities in the quicklime will not dissolve after adding water, wherein the setting of the filter mesh can retain the impurities in the filter mesh through the stirring plates and the filter mesh during stirring, and after the stirring is completed, the lime water slurry is completely discharged into the slurry storage tank.

The flue gas purification device comprises a flue gas conveying pipe, a purification box and a water injection assembly, and the first end of the flue gas conveying pipe is connected with a smoke outlet of the boiler; the purification box is provided with a purification cavity and a powder injection opening used for injecting lime powder, the powder injection opening communicates with the purification cavity, and the second end of the flue gas conveying pipe extends to the bottom of the purification cavity; the water injection assembly comprises a water injection pipe and a spray head which is arranged in the purification cavity and connected with the water injection pipe. According to the flue gas purification device for the boiler of the power plant disclosed by the embodiment of the invention, the lime water can be used for fully filtering flue gas discharged by the boiler and removing dust, CO, CO2, SO2, nitric oxide and the like in the flue gas, so that air pollution caused by direct discharge of the flue gas is prevented, and meanwhile, the probability of blockage of the flue gas discharge pipe can be reduced.

The invention provides a method for separating and extracting lithium carbonate from a low-lithium-content mica leaching solution. The method comprises the following steps: crushing a lepidolite roasting clinker, and leaching at normal temperature; defluorination and suction filtration are carried out on the leachate; adjusting the pH of the filtrate with lime water to remove magnesium; adding sodium carbonate into filtrate to remove calcium; extracting and separating to obtain a lithium-loaded organic phase; performing carbon dioxide reverse extraction on the lithium-loaded organic phase, removing calcium and magnesium from a reverse extraction water phase through resin, and performing pyrolysis to prepare lithium carbonate; and when potassium and sodium ions in the raffinate reach a certain concentration, carrying out evaporative crystallization to produce a potassium and sodium mixed salt byproduct. According to the method, the mica roasting clinker is leached with a large amount of water, the leaching rate of lithium is guaranteed, calcium oxide and sodium carbonate are adopted for impurity removal, the pH of a solution is increased, the extraction driving force is met, and the use amount of alkali liquor is reduced; after extraction, a loaded organic phase is subjected to carbon dioxide reverse extraction, introduction of a large amount of sodium carbonate during lithium precipitation is avoided, and cost and generation of sodium sulfate are reduced; the clinker is repeatedly leached by the raffinate, and the raffinate enters an evaporation desalting system, so that the energy consumption is low, and the production cost is low.

The invention discloses industrial flue gas desulfurization, dust removal and purification equipment. The equipment comprises a main body frame structure, a concentration adjusting assembly, a hydraulic transmission structure, a material collecting assembly and a neutralizing liquid circulating device. The invention belongs to the field of industrial flue gas desulfurization, and particularly relates to industrial flue gas desulfurization, dust removal and purification equipment. By arranging the concentration blending assembly, the hydraulic transmission structure, the material collecting assembly and the neutralization liquid circulating device, the device can realize automatic blending of the lime water slurry and ensure that the concentration of the lime water slurry is kept all the time, so that flue gas and the lime water slurry fully react, thorough desulfurization of the flue gas is ensured, and meanwhile, the energy consumption is reduced. The conveying of the flue gas and the conveying of raw materials of the lime water slurry are automatically controlled, so that a large amount of labor force is saved while the working efficiency is improved, and the problem that the concentration of the lime water slurry cannot be kept at an optimal numerical value when the existing wet desulphurization equipment on the market is used for carrying out desulfurization treatment on the flue gas is effectively solved; the reaction between the flue gas and the lime water is not thorough.

The invention discloses a coupling carbon capture selective catalytic denitration pyrolysis device which comprises a shell, a pyrolysis cylinder, a carbon capture cylinder and a heating cylinder, the shell is a rectangular shell, the top of the shell is provided with a separation cavity, the bottom of the shell is provided with a gas collection cavity, and the gas collection cavity is communicated with the pyrolysis cylinder. The first end of the pyrolysis cylinder extends into the shell from the top of the shell and communicates with the gas collection cavity, the pyrolysis cylinder is arranged at the center of the shell, and the pyrolysis cylinder is used for pyrolyzing ammonium carbamate powder and conveying pyrolysis gas of carbon dioxide and ammonia gas generated by pyrolysis into the gas collection cavity; the slaked lime water inlet is used for conveying raw and cooked lime water into the carbon capture cylinder so as to adsorb carbon dioxide in pyrolysis gas entering the carbon capture cylinder from the gas collection cavity. Compared with urea ammonia preparation, the ammonia preparation efficiency is improved by 5.4%-24.8% and averagely improved by 15.60%, the ammonia preparation energy consumption is reduced by 30.6%-40.6%, and meanwhile, the denitration efficiency of the generated mixed gas entering the flue gas selective catalytic denitration reactor can be improved by 2.8%-4.2%.

The invention relates to the field of combustion power plants, in particular to a coal-fired power plant waste heat utilization device which comprises a reaction tank and a heating tank, an auxiliary assembly is fixedly installed outside a connecting pipe, and the auxiliary assembly is located between the connecting pipe and a detection assembly. The desulfurization assembly is arranged, the one-way gas inlet valve is opened, then waste gas subjected to primary desulfurization is guided into the reaction tank along the flow guide pipe, lime water is contained in the reaction pipe, the lime water makes direct contact with acid gas, a neutralization reaction is carried out, harmless neutral salt particles are generated, and the purpose of waste gas purification is achieved; when waste gas enters the reaction tank along the flow guide pipe, generated airflow pushes lime water to flow, the vortex blades on one side are pushed by utilizing generated flowing force, so that the vortex blades rotate along the rotating rod, and in the rotating process, the lime water can be stirred, so that the lime water is uniformly distributed, and the purification effect on acid gas is improved.

The utility model discloses an anti-cavitation structure of a desulfurization pump, including a pump body and a casing, an input pipe is fixedly arranged on one side of the pump body, a sleeve is fixedly arranged on one side of the casing, a limiting mechanism for conveniently limiting the position of the sleeve and the input pipe is arranged between the sleeve and the input pipe, a filtering mechanism for convenient filtering is arranged on one side of the casing, a discharge pipe is inlaid and fixedly arranged on one side of the casing, an injection pipe is movably inserted and arranged at the center position of the casing, a limiting ring is fixedly arranged around the outside of the injection pipe, and a hollow block is movably sleeved at the lower end of the injection pipe. When the utility model is in use, gas is injected into the casing through the injection pipe and sprayed out through the extension pipe. At this time, the hollow block of the impact force belt rotates, which plays a stirring role, so that the gas and lime water are quickly and fully mixed, thereby ensuring that the gas is completely reacted with harmful substances.

According to the hydrogen purification method, mixed gas of hydrogen and carbon dioxide is directly introduced into lime water to remove carbon dioxide, the purity of hydrogen can be improved, the structure is named as a hydrogen purification device, hydrogen can be input into a first purification cavity through a hydrogen booster pump and a gas conveying pipe, and the purification cavity is communicated with the first purification cavity. Lime water is injected into the first purification cavity and the second purification cavity, entered mixed gas can react with the lime water to remove internal carbon dioxide, meanwhile, the lime water in the storage tank is sprayed into the interior through the pressurization pipe and the atomization spray head, and the carbon dioxide in the interior of the storage tank is removed. And the mixed gas can be fully contacted and reacted with the lime water, the hydrogen concentration can be effectively improved, and meanwhile, the reacted hydrogen enters the purification cavity II to react again.

This disclosure provides a two-step process to produce monocalcium phosphates from lime water treatment plant lime softening residuals and from other sources containing calcium salts. This patent focuses on the reuse of lime softening residuals to produce monocalcium phosphates and dicalcium phosphates for use in a variety of applications including as quick release and slow release fertilizers, for animal feed and other applications. The two-step process is conducted close to ambient temperatures and under controlled pH conditions to produce substantially pure calcium phosphate products while at the same time capturing the carbon dioxide generated in the process.

The invention discloses a method for preparing manganese sulfate from sulfur-free low-grade rhodochrosite. The method comprises the following steps: by taking low-grade rhodochrosite as a raw material, grinding and pretreating the low-grade rhodochrosite, mixing the low-grade rhodochrosite with water, adding acetic acid, fully stirring, heating and leaching, and carrying out solid-liquid separation after the reaction is finished, so as to obtain a liquid-phase manganese acetate mother solution and solid-phase sulfur-free manganese slag; sulfuric acid is added into the manganese acetate mother liquor, heating and reduced pressure distillation are conducted, acetic acid is vaporized and then condensed and recycled for ore leaching, and manganese sulfate is crystallized and separated out in the heating process to serve as a product. Sulfuric acid is not in direct contact with manganese ore, the manganese slag does not contain sulfur, resource utilization is facilitated, and the treatment cost of the manganese slag can be remarkably reduced; and residual acid in the slag can be neutralized by lime water to stably exist, so that the risk of secondary pollution is avoided. The concentration of the acetic acid is not high, cyclic utilization is achieved in the method, the production cost is reduced through recycling of the acetic acid, the resource utilization rate is further increased, and the method is particularly suitable for the manganese extraction process of low-grade rhodochrosite.

Provided are: a marine environment improvement method capable of reducing greenhouse gas by absorbing carbon dioxide and improving a marine environment; and a calcium ion supply device used for the same. The marine environment improvement method involves: supplying lime water or calcium carbonate and water to a reaction tank 10; supplying atmosphere A into the reaction tank 10; causing a reaction in the reaction tank 10; and supplying, to the sea S, an aqueous solution of obtained calcium hydrogen carbonate. A calcium ion supply device 1 includes the reaction tank 10, a supply device 2, a gas-liquid contact device 3, a conveyance device 4, and a control device 5 for controlling each of the devices.

The invention relates to the technical field of landfill hazardous waste treatment, and provides a spraying and soaking device and method for curing waste catalyst heavy metal, which can solve the problem that large blocky and granular catalysts are difficult to cure by traditional cement through a process of spraying lime water and fully contacting and soaking waste in spiral stirring. According to the technology, for waste with toxic leaching (heavy metal and corrosive PH) exceeding the standard, especially for mercury and arsenic type heavy metal which is particularly difficult to treat, the use amount of a curing agent is reduced, the operation cost is reduced, and the treatment efficiency is greatly improved, the invention discloses a spraying and soaking device for curing heavy metal in a waste catalyst. The spraying and soaking device comprises a bearing frame body, a spiral rotating transmission shaft, a medicament box, a spraying and dosing system and a discharging assembly, by means of the technical scheme, the problems that in the prior art, for heavy metal which is particularly difficult to treat mercury and arsenic, the use amount of curing agents is large, the operation cost is high, and the treatment efficiency is low are solved.

The application discloses a preparation method of silane composite nano C-S-H for hydrophobic modification of a concrete surface and application thereof, and relates to the field of building engineering materials. In the prior art, silane is prone to self-polymerization in a strong alkali environment, is difficult to be stably compounded with nano C-S-H, and cannot realize the synergistic effect of hydrophobicity and densification during the construction window period of fresh concrete. The application comprises the following steps: preparing a silane hydrolysis solution A, mixing ethanol, water and n-octyl triethoxysilane in a mass ratio of 50:1:(1.5-2.5), first hydrolyzing in an acid to adjust the pH, and then adjusting to near neutrality by an alkali; preparing a surface aminated dispersion solution B, dispersing nano C-S-H in an alkaline medium, adjusting the solid content and the pH by saturated lime water, and adding gamma-aminopropyl triethoxysilane to react; adding the liquid A into the liquid B to condense, and adjusting the solid content and the pH after alcohol removal. The technical scheme realizes the improvement of hydrophobicity, anti-permeability and chlorine ion resistance, and the obtained suspension is used for concrete surface treatment, so that the synergistic improvement of rapid hydrophobicity and surface layer densification can be realized.

The application discloses a treatment process of high-purity quartz sand acid washing wastewater and belongs to the technical field of wastewater treatment. The treatment process comprises the following steps: S1, high-purity quartz sand acid washing wastewater is discharged into raw water pool and is left standing; S2, the wastewater is pumped to a neutralization pool, lime water is added, and the pH of the wastewater in the pool is adjusted to 6.0-7.0; S3, after neutralization, the wastewater is transported to a coagulation and sedimentation pool, calcium chloride and PAC are added, coagulation stirring is carried out, standing and sedimentation are carried out, and after sedimentation, sludge is discharged to a sludge pool; S4, the supernatant of the coagulation and sedimentation is discharged to an ion adsorption pool, stirring is started, an adsorbent calcium aluminum hydrotalcite is added to the pool for adsorption, and the content of fluorine ions is determined, until the content of fluorine ions is lower than 5 mg / L, the stirring and adsorption are stopped, and the water quality reaches the standard and is discharged to a discharge pool. The method can realize stable adsorption under a low fluorine ion concentration, significantly improves the removal rate of fluorine ions, and finally obtains standard wastewater with a fluorine content of not more than 5 mg / L.

A handheld bidet device according to one embodiment of the present invention comprises: a housing including a first communication port, which is connected to a hose so that water enters therein, and a second communication port through which the water is discharged; a lower filter disposed at the first communication port side in the housing so as to provide an anti-bacterial function and a limewater neutralization function with respect to the water; and an upper filter coupled to communicate with the lower filter, thereby providing a purification function with respect to the water, wherein the water enters the first communication port, sequentially passes through the lower filter and the upper filter, and is discharged through the second communication port. The handheld bidet device of the present invention can have the functions of removing foreign material from water in use and neutralizing limewater.

The invention belongs to the technical field of inorganic material preparation, and particularly relates to a method for preparing high-activity calcium hydroxide through ultrasonic-microwave coupling reinforced lime digestion. According to the invention, quicklime and water are used as raw materials, water is used as a solvent to obtain a lime-water mixed system, and through three-stage regulation and control of pre-ultrasonic activation, ultrasonic-microwave coupling accelerated reaction kinetics and high-frequency ultrasonic post-treatment, pore structure optimization and particle refinement of the product are realized; the high-activity calcium hydroxide particles with the specific surface area of more than 45m < 2 > / g and the porous structure are obtained. According to the preparation method provided by the invention, the specific surface area of the calcium hydroxide can be further increased through the decomposition of the pore-forming agent and the ultrasonic-microwave coupling synergistic effect, the accurate regulation and control of the pore structure of the calcium hydroxide are realized, the desulfurization activity of the product is improved, and the obtained product can be widely applied to the fields of flue gas purification, soil remediation and the like.

The application discloses a method for treating and utilizing large-particle waste sand in ammonia-alkali method alkali waste liquid, and the process is as follows: treating the large-particle waste sand, reducing the content of soluble salt in the waste sand through water washing, controlling the content of soluble salt in the waste sand to be less than or equal to 2%, designing the mixing proportion of the waste sand lime cement soil, replacing the soil in the cement lime soil with different amounts of waste sand, keeping the mass ratio of the admixture lime and cement unchanged in each test, and decreasing the content of the soil corresponding to the waste sand proportion gradient; carrying out the compaction test on the materials in each group under different target moisture contents, obtaining the maximum dry density and the optimum moisture content of the sample; determining the waste sand replacement interval of the waste sand lime cement soil meeting the strength and the optimum proportion of the waste sand lime cement soil material; and preparing the waste sand lime cement soil for paving the roadbed or the base of the road. The application solves the phenomenon of pipe grinding in the process of filling the well with the alkali waste liquid, prepares the road material according to the designed proportion of the large-particle waste sand and the lime soil, reduces the cost of the alkali waste liquid, and changes the large-particle waste sand into the road raw material.

The present invention discloses an electrolytic manganese slag cyclic alkali washing harmless treatment system and method, which relates to the technical field of industrial solid waste disposal, and solves the problems of low lime utilization rate, high energy consumption, cumbersome operation and the need to adjust the pH value after treatment during the harmless treatment of electrolytic manganese slag. The system of the present invention includes an alkali washing stirring tank, a first filter press, a saturated lime water stirring barrel, a lime storage tank, a second filter press, a manganese slag air drying device and an ammonia absorption device; the method of the present invention includes the following steps: stirring alkali washing, solid-liquid separation, aeration alkalization, solid-liquid separation of the suspension, manganese slag air drying and ammonia absorption. The present invention realizes the harmlessness and reduction of the original electrolytic manganese slag and the backwashing filter press slag through cyclic alkali washing with saturated lime water by the electrolytic manganese slag cyclic alkali washing harmless treatment system. The process flow is simple, the operation method is simple, the operation cost is low, the treatment effect is good and the alkali liquid can be recycled, and the industrial application feasibility is relatively high.

The utility model relates to the technical field of steel cylinder quality detection, in particular to a steel cylinder quality testing device which comprises an efficient detection mechanism, the efficient detection mechanism comprises a workbench, a positioning frame, a clamping arm body, a steel cylinder body, a liquid storage tank and a corrosion-resistant tank, and the top of the workbench is sleeved with the positioning frame in a sliding mode; one end of the clamping arm body is in threaded connection with the outer side of the positioning frame, the vice end of the clamping arm body is tightly attached to the top of the steel cylinder body, the steel cylinder body is clamped in the corrosion-resistant tank, and the liquid storage tanks are symmetrically distributed on the two sides of the corrosion-resistant tank. When the steel cylinder body with carbon dioxide or oxygen is checked, lime water can be fed into the liquid storage tank on the other side and then pumped into the corrosion-resistant tank, if bubbles are generated, it shows that the steel cylinder body with oxygen leaks, and if calcium carbonate precipitates exist at the bottom of the corrosion-resistant tank, it shows that the steel cylinder body with carbon dioxide leaks.

The invention relates to the technical field of building materials, in particular to a method for reducing microcracks of recycled aggregate based on pre-infiltration treatment, which comprises the following steps: pre-infiltrating high-strength concrete recycled aggregate by using a saturated lime aqueous solution, calculating the number N of dry-wet cycles according to the crack width, and carrying out quantitative treatment on the number N of pre-soaking times, the controllability and repeatability of the recycled aggregate treatment process are remarkably improved, microcracks on the surface of the recycled aggregate are sealed after treatment, and then the long-term performance of recycled aggregate concrete is improved.

The invention relates to the technical field of water treatment, in particular to a modified nano calcium hydroxide emulsion for water treatment and a preparation method thereof.The preparation method comprises the following steps that calcium hydroxide is weighed and placed in water to be stirred, and a saturated lime water solution is prepared; preparing calcium chloride, carboxyethyl cellulose and water into a mixed solution; adding a crystal form control agent, gradually dropwise adding a sodium hydroxide solution while stirring until no new precipitate is generated, and carrying out ultrasonic oscillation to obtain slurry; centrifugally washing precipitates in the slurry for 3-5 times by using saturated lime water; carrying out vacuum drying for 10-15 hours at the temperature of 100-110 DEG C to obtain modified calcium hydroxide powder; adding the modified calcium hydroxide powder and a sodium polyacrylate dispersing agent into water, and stirring and dissolving to obtain the modified nano calcium hydroxide emulsion. The modified nano calcium hydroxide emulsion prepared by selecting and matching specific raw materials and processes has certain flocculation adsorption capacity while reducing agglomeration of nano particles, and the purification effect is improved.