39results about How to "Prevent acid corrosion" patented technology

The invention belongs to the field of chemical industry, and provides a lithium carbonate preparation method, which comprises: mixing an extraction organic phase and a lithium-containing solution according to a volume ratio of 1:1-10 to form an alkaline extraction system, and extracting 1-3 times to obtain a lithium-containing organic phase, wherein the single extraction time is 1-15 min; mixing the lithium-containing organic phase and a back extraction solution according to a volume ratio of 1:1-10, carrying out back extraction 1-3 times, and collecting a lithium ion-containing lithium hydrogen carbonate aqueous solution, wherein the single back extraction time is 1-15 min, and the back extraction solution is an aqueous solution prepared by introducing carbon dioxide into a combination comprising one or any materials selected from pure water, an alkali metal salt and an ammonium salt aqueous solution; and heating the lithium ion-containing lithium hydrogen carbonate aqueous solution to crystallize and precipitate the lithium hydrogen carbonate in the aqueous solution, and thermally decomposing to obtain lithium carbonate. According to the present invention, the method has high extraction efficiency, can directly extract lithium ions from alkaline brine or aqueous solutions to prepare lithium carbonate, and further has advantages of low corrosion on production equipment, low production cost and environmental protection.

The invention discloses a protective agent of a pile head of a storage battery and a preparation method thereof. The protective agent comprises the following components by weight percent: 25%-35% of antioxidant, 10%-15% of mineral oil, 5%-10% of penetrating agent, 20%-25% of anticorrosive additive and 15%-25% of LPG (liquefied petroleum gas) propellant. When the protective agent is used, a package bottle is close to the sprayed position for spraying, and the proper spraying amount is applied. The protective agent can form a long-acting temperature-resisting film so as to protect the pile headof the storage battery, a charging clip and a circuit joint; the protective agent can prevent oxidation and maintain the good contact of the storage battery; the protective agent can prevent the acidic corrosion of the storage battery; and the protective agent can prevent instant impedance and voltage drop.

The invention relates to an ethylene glycol coolant circulating system which comprises a refrigerating machine, a heat exchanger, a coolant tank, a control system, a PH transmitter and an alkali solution storage tank, wherein a solution output tube of the alkali solution storage tank is connected to a main transmission tube which is communicated with the coolant tank, the PH transmitter is installed on the coolant tank, a signal collected by the PH transmitter is transmitted to the control system, and a filling pump is installed on the main transmission tube. Acidic corrosion after oxidization of the coolant can be effectively avoided.

The invention provides a high-temperature water slag washing steam pollutant deep treatment system and treatment method, the system comprises a granulation tower, a slag washing water inlet, a high-temperature slag inlet, a spraying device, a demister, a spraying liquid supply system and a slag washing pool, the spraying liquid supply system is connected with the spraying device; wherein the slagflushing pool is connected with the tower wall at the bottom of the granulation tower through a slag ditch, and the side wall at the top of the slag flushing pool is connected with the tower wall of the granulation tower through a steam return pipeline. Wherein the spraying liquid supply system comprises a filter, a settling water tank, a booster water pump and a heat exchanger which are sequentially connected through a spraying water pipeline, a liquid collecting device is arranged below the spraying device, and an inlet of the filter is connected with an outlet of the liquid collecting device. The blast furnace slag flushing steam can be deeply purified, the discharge amount of hydrogen sulfide, sulfur dioxide and other acid pollutants is reduced, slag flushing steam waste heat recyclingis achieved, and the water consumption of a slag flushing system is greatly reduced.

The invention provides a method for preparing filtering material for removing acidic gas in air, which includes steps of preparing potassium permanganate solution; granulating: after crushing, raw material aluminum hydroxide (with granularity of 7-15 microns) is treated by flash-roasting to prepare aluminum oxide powder, the aluminum oxide powder is put into a ball forming mill and added with the potassium permanganate solution to prepare balls, the size of the ball is controlled to about 3-5mm; hydrating: the prepared balls is hydrated by steam with temperature of 95-100DEG C for 6-8 hours; and baking finished product: hydrated filtering material is conveyed into an electro-thermal rotary furnace for activated baking to obtain the finished material. The invention has advantages that effective adsorption capability of the filtering material prepared by the method is 16% to HS, adsorption specific surface area of aluminum oxide is increased, and purification efficiency is improved. The material can be applied for air purifying device, so that the air purifying device can be widely applied for instrument chamber of petrochemistry industry, paper making industry and metallurgy industry, thereby effectively avoiding acid erosion of HS to instruments.

The invention relates to a heavy-loading CNG natural gas engine oil complexing agent and a preparation method and application thereof. The raw materials of the complexing agent comprise base zinc saltof dioctyl thiophosphate, super-alkali-value synthesis calcium sulfonate, alkylated diphenylamine, amidogen thioester, super-alkali-value synthesis magnesium sulfonate, high-molecular-weight ashlessdispersing agent and single alkenyl succinimide. The method comprises the steps that the raw materials are weighed, added to a blending kettle, heated to 60-70 DEG C, stirred for 2-3 hours at normal pressure and filtered, and the heavy-loading CNG natural gas engine oil complexing agent is obtained. The heavy-loading CNG natural gas engine oil complexing agent and the preparation method and application thereof have the advantages that the preparation method is easy to operate and the agent is easy to prepare. The complexing agent can distinctly meet the requirements in the second, third and fourth type of oil and is suitable for meeting the performance requirement of large-sized fixed and large-power mobile CNG natural gas engines.

The invention discloses a MTBE device methanol recovery system and a process. The MTBE device methanol recovery system comprises a methyl alcohol raw material tank and a C4 raw material tank which are connected with a feeding mixer, the feeding mixer is connected with a catalytic distillation tower through a purifier, the top of the catalytic distillation tower is connected with a catalytic distillation reflux tank, and the bottom of the catalytic distillation tower is connected with an MTBE product tank; the catalytic distillation reflux tank is in reflux connection with the catalytic distillation tower through a pipeline and is connected with a C4 tower through a pipeline, one path of the C4 tower is connected with a C4 tower reflux tank, one path of the C4 tower is connected with a heavy C4 product tank, and one path of the C4 tower is connected with an isobutane product tank; one path of the C4 tower reflux tank is in reflux connection with the C4 tower, one path of the C4 tower reflux tank is connected with an isobutane product tank, the other path of the C4 tower reflux tank is a methanol recycling pipeline, and the C4 tower reflux tank is connected with a methanol raw material tank through a methanol recycling pipeline. The invention relates to an innovative process for recovering methanol by an MTBE device, which does not adopt a common extraction and conventional distillation method in a methanol recovery process, and adopts an azeotropic distillation method for methanol recovery. No water participates in the recovery process, so that the problem of acid corrosion of equipment can be effectively avoided.

The invention provides a method and system for preparing a steel strand-FRP composite bar, and relates to the technical field of composite material preparation. The method for preparing the steel strand-FRP composite bar, provided by the invention, comprises the following steps of twisting steel wires to obtain a steel strand; soaking the steel strand in a resin solution to obtain a resin-coated steel strand; and wrapping the surface of the resin-coated steel strand with an FRP fiber bundle, and performing heating curing and cooling tightening in sequence to obtain the steel strand-FRP composite bar. The steel strand-FRP composite bar prepared by the method can prevent the steel strand from being subjected to carbonization, oxidation and acid corrosion, and has higher high temperature resistance and mechanical property.

The invention relates to a method for extracting lithium from salt lake brine. The method comprises the following steps that (1) the salt lake brine is provided; (2) the salt lake brine is mixed withan extracting solution, and extracting is carried out to obtain a loaded extraction liquid; (3) the loaded extraction liquid is mixed with a stripping liquid, and stripping is carried out to obtain stripping raffinate containing lithium bicarbonate, wherein the pH value of the stripping raffinate is 7-11, and the pH value of the stripping raffinate is less than or equal to the pH value of the loaded extraction liquid; and (4) the stripping raffinate is heated, and separating is carried out to obtain lithium carbonate. The method can avoid acidic corrosion of equipment and is high in safety, and the obtained lithium carbonate is high in purity and low in cost.

The invention discloses a water-based grinding fluid suspension additive. The water-based grinding fluid suspension additive comprises main components: a suspension stabilizer SF-1, a thickening agent ACRYSOL TT-935, a moisturizing agent VK-N80, ammonium polyphosphate, tripropylene glycol monomethyl ether, a lubricant MPEG-600, a defoaming agent Surfynol DF-75, and alkaline electrolysis water. The water-based grinding fluid suspension additive can be used for uniformly dispersing and suspending various types of unprocessed abrasive particles, such as alumina, zirconia, silicon carbide, boron carbide, natural or synthetic diamond, garnet and the like. The water-based grinding fluid suspension additive has excellent suspension performance, can save as much as 50% of an abrasive, and also can achieve the same or better grinding rate and grinding quality. The water-based grinding fluid suspension additive has excellent chemical and physical performance, is widely applied in industrial grinding, and is suitable for the field of sapphire grinding.

The invention provides a high-temperature water slag flushing dead steam energy-saving water collection and pollutant treatment system and method. The system comprises a high-altitude granulation tower, a slag washing water inlet, a high-temperature slag inlet, a liquid collecting device, a spraying device, a mixed air heating area, a mixed gas induced draft fan, a slag washing pool, a spraying water condensation water treatment unit, a dead steam bypass condenser, a gas heat source unit, a demister and a hygrothermograph, wherein the slag washing pool is connected with the tower wall of the bottom of the high-altitude granulation tower, the spraying water condensation water treatment unit is connected with the liquid collecting device and the spraying device, the inlet of the dead steam bypass condenser is connected with the tower wall of the high-altitude granulation tower through a dead steam bypass pipeline leading-out section A1, the outlet of the dead steam bypass condenser is connected with the inlet of the second demister, and the outlet of the second demister is connected with one side of the mixed air heating area through a dead steam bypass pipeline leading-back sectionA2. According to the invention, blast furnace slag flushing dead steam can be deeply purified, the discharge amount of hydrogen sulfide, sulfur dioxide and other acid pollutants is reduced, slag flushing dead steam waste heat recycling is achieved, and the water consumption of a slag flushing system is greatly reduced.

The invention discloses a chemical feeding device for a boiler. The chemical feeding device comprises structures of a chemical feeding metering box, a stirring machine, chemical feeding pumps, all pipelines and the like, wherein the stirring machine is arranged at the top of the chemical feeding metering box, the bottom of the chemical feeding metering box is connected with one end of a liquid chemical output pipeline, the other end of the liquid chemical output pipeline is divided into two branch pipelines to be respectively connected with the two chemical feeding pumps, and the two chemicalfeeding pumps are finally connected with the boiler through a total output pipeline. The two chemical feeding pumps are finally connected with the boiler through the total output pipeline, so that mixed liquid chemical can be pumped into the boiler; finally, the boiler is helped to achieve continuous chemical feeding, and acid corrosion to the boiler is prevented from being generated. The chemicalfeeding device for the boiler disclosed by the invention has the technical advantages of novel space structure distribution, reasonable structure, ability in feeding and supply chemicals continuously, strong practicability and the like.

The invention discloses a synthetic method of p-cyanophenol, which comprises the following specific steps: adding a solid phosphoric acid catalyst into a reaction bed layer of a fixed bed reactor, dissolving methyl parahydroxybenzoate into a solvent, feeding the solvent and water into the fixed bed reactor, introducing ammonia gas into the reactor, controlling the temperature of the reactor to be 300-500 DEG C and the pressure to be more than 0.06 MPa, continuously discharging, and rectifying and purifying to obtain a p-cyanophenol finished product. According to the synthetic method of the p-cyanophenol, provided by the invention, the reaction yield and the conversion rate are comprehensively improved through the preparation of the solid phosphoric acid catalyst, the surface treatment of a glass ball filler and the improvement of a phosphoric acid solution.

The invention discloses a waterproof and thermal insulation coating used for a building exterior wall and applied to an acidized environment and a production method of the waterproof and thermal insulation coating. The waterproof and thermal insulation coating is composed of a liquid crystal polymer, an anti-acidification component and additives; the anti-acidification component is an alkalized fiber prepared from saw dust; the additives include a dispersant, a physical foaming agent and a toughening agent; the dispersant is hydroxypropyl methyl cellulose; the physical foaming agent is a fluorocarbon compound; the toughening agent is liquid ethylene propylene rubber; and the waterproof and thermal insulation coating respectively comprises the components in percentage by weight: 79.5%-82.5%of the liquid crystal polymer, 10%-12% of the anti-acidification component, 1.3%-2.5% of the hydroxypropyl methyl cellulose, 3.5%-5.2% of the fluorocarbon compound and 1.8%-3.7% of the liquid ethylene propylene rubber. The production method disclosed by the invention is detailed and easy to realize, good in antibacterial effect, lasting in effect, environment-friendly, pollution-free, free of pungent smell and water-resistant and has a self-cleaning function.

The invention relates to a subcritical drum boiler water treatment method which is implemented by adding sodium hydroxide into boiler water until the weight percent of sodium hydroxide in the boiler water is 0.08-1%. The pH value of the boiler water before adding the sodium hydroxide is 9.2-9.25, and the pH value of the boiler water after adding the sodium hydroxide is 9.45-9.5. Compared with the prior art, after the method is used for treating the boiler water, the pH value, hydrogen electric conductivity, chlorine ions and other indexes of the boiler water are effectively monitored, the boiler water pollution discharge-condensation water fine treatment mixed bed can operate in a more economic and reasonable way, the vapor quality of the thermodynamic system is reliably ensured, the salt content of the boiler water is greatly lowered and is easy to control, the chlorine ion content of the boiler water is greatly lowered and does not have the overproof phenomenon as compared with the phosphate treatment working conditions, and the hidden danger of corrosion of chlorine ions to the boiler tube is effectively prevented. When the boiler is shut down for inspection, the thermodynamic system is clean, the water wall tube oxide film is uniform, smooth and compact and does not have the phenomenon of pitting corrosion, and the scaling rate is less than 40 g/m<2>.a, thereby satisfying Grade 1 in Standard DL/T561-95 for evaluation on scaling rate from the water wall to the fire side and corrosion.

The invention provides a fixing holddown device and a single arm-type driving plating line. The fixing holddown device is arranged on an electroplating conductive member (Feiba) of a single arm-type driving plating line and is used for fixing a hanger of a hanging basket hung to the Feiba. The fixing holddown device comprises a first rotator, a second rotator and a handle. A first position of one end of the first rotator is hinged to the Feiba, a second position of the end of the first rotator is hinged to a first end of the handle and the other end of the first rotator can tightly press the hanger on Feiba. One end of the second rotator is hinged to the first position of the handle and the other end of the second rotator is hinged to the Feiba. The axes of two hinging shafts of the first rotator are not in the same plane with the axes of two hinging shafts of the second rotator. An operator can tightly press the hanging basket only by pressing the handle and can release the hanging basket only by raising the hand so that operation efficiency is improved, labor intensity is reduced and Feiba damage caused by fixed screw fixation of the Feiba and the hanging basket is avoided.