84 results about "Limewater" patented technology

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 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 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 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 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 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%.

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.

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.

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 comprises a method of making lime, dolomitic lime, hydraulic cement such as portland cement clinker and co-products such as pozzolan, acids, alumina, silica and the like. The method comprises providing a natural calcium-iron-aluminosilicate mineral from one or more of hyaloclastite, lava, scoria, volcanic glass, volcanic ash, or any other mineral of a basaltic or intermediate chemical composition and reacting the hyaloclastite with a first hydrochloric acid to create a first salt, precipitating the calcium ions to react with OH− to form calcium hydroxide and heating the calcium hydroxide to create calcium oxide, alite and belite.

The invention discloses a dosage calculation method for regulating and controlling the acidity of required soil by using an alkaline material, which comprises the following steps: step 1, measuring the initial pH value of the soil to be regulated and controlled, and generating a pH-lime water addition amount curve by using a calcium hydroxide titration method; 2, according to the pH-lime water addition amount curve, obtaining the lime demand amount for adjusting the soil; 3, according to the lime demand quantity for adjusting the soil, obtaining the lime equivalent value of an alkaline material and the alkaline material demand quantity for adjusting the soil through an acid extraction-alkali back titration method; and 4, according to the demand quantity of the lime for adjusting the soil and the demand quantity of the alkaline material for adjusting the soil, obtaining the combined dosage of the lime with the target pH value and the alkaline material. The method provided by the invention has the characteristics of reducing soil acidity, realizing dynamic adaptation of total alkalinity and reducing the risk of excessive application of a single material.

The utility model discloses a lime water blending device for water treatment industry, which comprises a mixing frame, a baffle plate and a locking component, longitudinal plates are inserted and connected in the mixing frame in a central symmetry manner, and liquid outlet holes are formed in the top ends of the longitudinal plates in a central symmetry manner. Through the design of the longitudinal plate, the transverse plate, the liquid inlet assembly, the liquid outlet hole, the liquid outlet assembly, the baffle and the locking assembly, the interior of the material mixing frame is divided into four sections through the longitudinal plate and the transverse plate, the middle two sections are sample injection storage areas, a sample injection pipe opening is formed in the bottom, each section is connected with a slaked lime water pipe and a tap water pipe, and mixing areas are arranged on the two sides; the two sides of the upper end of each storage room are each provided with an inverted-triangle-shaped liquid outlet hole, the adjustable water outlet baffle is arranged on the side face, the water volume proportion is controlled by adjusting the water outlet baffles, drop water at the upper end has the mixing function, a storage tank or a stirrer does not need to be additionally arranged, and therefore the lime water blending steps are simplified, operation is easy, and practicability is high.

The utility model relates to the technical field of flue gas denitrification and desulfurization, and discloses flue gas denitrification and desulfurization equipment which comprises a base plate, a desulfurization tower, a denitrification tower and a heat exchange box are sequentially mounted at the top end of the base plate, a gas inlet pipe is mounted on one side of the desulfurization tower, the desulfurization tower is connected with the denitrification tower through a first connecting pipe, and a gas outlet pipe is mounted on the other side of the desulfurization tower. And the denitration tower is connected with the heat exchange box through a second connecting pipe. According to the utility model, the filter plate is designed in the desulfurization tower, and the position of the lime water in the desulfurization tower is slightly higher than that of the filter plate, so that solid substances can be filtered to be layered with the lime water, and the solid substances can be kept wet; and solid substances mixed with lime water above the filter plate are pumped out of the tower through the plurality of sewage suction branch pipes and the sewage suction main pipe, so that the situation that the accumulation of the solid substances possibly causes pipeline blockage or equipment failure is avoided.

The utility model belongs to the field of waste gas treatment, specifically is a kind of environmental protection type desulfurization device, including tower body, the bottom of tower body is installed slurry pool;The side of slurry pool is equipped with delivery pump, the slurry in slurry pool can be extracted by delivery pump;The output end of delivery pump is fixed with delivery pipe, the inside of tower body is equipped with spray tray, the inside of spray tray is equipped with cavity, delivery pipe and spray tray are fixed, delivery pipe and cavity are connected, the bottom of spray tray is equipped with multiple atomizing nozzles, slurry is distributed to the nozzle below in cavity, nozzle is sprayed lime water slurry in the inside of tower body, waste gas needs to flow below spray tray, and from the air pipe to flow to the top of spray tray, rely on above-mentioned structure setting, to this can improve waste gas distribution uniformity and lime slurry spraying uniformity, improve waste gas and lime slurry reaction uniformity, to further improve desulfurization treatment effect.

The utility model relates to the technical field of solid-liquid separation equipment, in particular to a solid-liquid separation device, which comprises two liquid inlet pipes and two groups of stirring tanks, each group of stirring tanks is connected with one liquid inlet pipe, the stirring tanks are arranged in a fixed table, each group of stirring tanks is formed by connecting two tank bodies, a communication port is arranged at the joint of the two tank bodies, and the liquid inlet pipes are communicated with the communication port. A stirring paddle is arranged in each tank body, the upper end of each stirring paddle penetrates through an upper cover of the corresponding tank body and is connected with an output shaft of a driving motor, the driving motors are installed on the surfaces of the upper covers of the tank bodies, and a solid-liquid separation groove is formed in one side of the fixing table. By arranging the solid-liquid separation tank and the stirring tank, calcium oxide and water are mixed, stirred by the stirring tank and then conveyed into the solid-liquid separation tank through the liquid distribution pipe, then clear liquid is discharged through the overflow tank, and sediment is deposited at the bottom of the tank body and discharged through the slag discharge pipe, so that preparation of lime water for neutralizing a pickling solution pipe can be efficiently completed; and the defect that the precipitate enters the pickling solution to be subsequently treated again is avoided.

The invention discloses a method for improving the color of vinegar sparganium stoloniferum, and belongs to the technical field of traditional Chinese medicine processing. The method comprises the following steps: S1, pretreatment: taking fresh rhizoma sparganii, washing, peeling, slicing, putting into 4-7wt% lime water, and boiling for 4-7 minutes; s2, neutralizing and cleaning: cleaning to be neutral and draining; s3, infiltrating with vinegar: infiltrating with table vinegar; s4, performing steaming: performing steaming for 40 to 45 minutes by using saturated steam with the pressure of 0.09 to 0.12 MPa; s5, drying: drying to obtain the vinegar rhizoma sparganii. The processed vinegar rhizoma sparganii is uniform and consistent in color and luster and free of focal spots. Effective components are fully dissolved out (the extract content is greater than 30%); the conversion rate of flavonoid components is improved (the content of quercetin is greater than 0.75 mg / g).

The invention relates to the technical field of industrial wastewater treatment, and discloses a heavy metal and thallium removal process for sintering desulfurization wastewater, which comprises the following steps: regulating the pH value of the wastewater to 8.5-9.0 through lime water pretreatment, and synchronously precipitating sulfate radicals; the method comprises the following steps: adding a 10% sodium sulfide solution (5L / m < 3 >) into a filtrate to remove heavy metal ions and thallium, carrying out flocculation filter pressing by using 1% polyacrylamide (300mL / m < 3 >), then removing excessive sulfur ions by using a 15% polyferric sulfate solution (5L / m < 3 >), finally adjusting the pH value by using lime water, carrying out secondary flocculation filter pressing to remove iron ions, and finally discharging the filtrate after reaching the standard. The process does not need heating and an oxidizing agent, synchronously removes various heavy metals and thallium at normal temperature, is low in medicament cost, does not introduce organic matters, realizes resource utilization of precipitates, and is suitable for efficient and environment-friendly treatment of the desulfurization wastewater in the iron and steel industry.

The utility model discloses a lime water settling device for washing purification, and relates to the technical field of washing purification. The device comprises a mounting plate, a settling assembly is arranged on the upper surface of the mounting plate and comprises a settling box arranged above the mounting plate, a large-hole filter plate and a small-hole filter plate which are arranged from top to bottom are arranged in the settling box, and supports which symmetrically and vertically penetrate through the upper surface of the large-hole filter plate and are fixedly connected are of an inverted-U-shaped structure. A rotating motor is connected to the middle of the upper surface of the mounting plate, and the upper end of a rotating shaft vertically connected to the output end of the rotating motor is connected to the middle of the lower surface of the settling box; and a material pushing assembly is arranged on the side wall of the settling box. According to the lime water settling device, the settling assembly is arranged, the structure is compact, the occupied space is reduced, lime water can be better and faster settled, the material pushing assembly is arranged, the lime particle discharging step is simplified, and the workload during lime particle discharging is reduced.

The application discloses a preparation method of a coal-saving agent for denitration type cement firing and application thereof. The method comprises the following steps: (1) mixing aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol and polymer emulsion, stirring uniformly, drying and grinding to obtain a precursor powder; (2) placing the precursor powder in saturated limewater and reacting under heating conditions, separating out solid matters after completion, drying the solid matters, mixing the dried solid matters with phosphating liquid, standing and drying to obtain a denitration heat-aiding agent; and (3) taking a penetrating agent, a bulking agent, iron citrate and the denitration heat-aiding agent as an A component, and taking hydrogen peroxide as a B component. The A component and the B component are mixed uniformly before use to obtain the coal-saving agent. The coal-saving agent can promote the combustion of coal powder, improve the utilization rate, help to reduce the emission of polluting gases such as sulfur oxides and nitrogen oxides, and relieve the high energy consumption and high pollution problems faced by cement production enterprises.

The invention provides a method for preparing high-purity magnesium sulfate heptahydrate by utilizing magnesium-containing gold ore, and belongs to the technical field of comprehensive utilization of resources, the method provided by the invention comprises the following steps: crushing the magnesium-containing gold ore, putting the crushed magnesium-containing gold ore into a dump leaching column, circularly spraying the crushed magnesium-containing gold ore with a hot dilute acetic acid solution and a hot lime water solution in sequence, and discharging the solution; circularly spraying the ore again by using a dilute sulphuric acid solution, and collecting a pickling solution obtained by reacting dilute sulphuric acid with the ore; naturally air-drying the pickling solution to obtain crude salt; the method comprises the following steps: adding water into crude salt, dissolving at a high temperature, adding caustic calcined magnesite to adjust the pH value, heating the solution to boil, keeping the boiling state for 5-6 minutes, quickly cooling the boiling solution to 60-65 DEG C within 2 minutes, quickly filtering, retaining filtrate, naturally cooling and crystallizing the filtrate, filtering, screening out crystals, and drying to obtain magnesium sulfate heptahydrate. The magnesium sulfate product prepared by the invention is relatively high in purity, and the content of MgSO4. 7H2O is 99.7%, the content of iron is 0.0015%, the content of chlorine is 0.015%, and the content of arsenic is 0.0002%.