50 results about "Salt fluoridation" patented technology

The invention discloses fluoride salt-free and nitrate-free low-temperature matte glaze for steel plate enamel as well as a preparation method and application of the low-temperature matte glaze, and belongs to the technical field of enamel. The matte glaze is prepared from quartz, borax pentahydrate, sodium carbonate, titanium dioxide, magnesium oxide, monopotassium phosphate, calcium carbonate, zinc oxide, magnesium carbonate, lithium carbonate, aluminum oxide and zirconium silicate according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1300 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. The matte glaze completely avoids the use of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are eliminated from the source, the fluorine content of the product is not detected through detection, and the limit value requirements of European Union REACH regulations are met. Zinc oxide and ZnO / TiO2 are added, so that the liquid phase viscosity is reduced, ion diffusion is accelerated, and the opacity (opacification performance) and gloss of the porcelain glaze are enhanced.

The utility model relates to the technical field of electrolytic bath blanking and filtering, and particularly discloses an electrolytic bath fluoride salt blanking port filtering device which comprises a feeding port, support legs are fixedly installed on the outer surface of the feeding port, the support legs are designed in a stacking mode and located on the inner side of the feeding port, an installation frame is inserted into the feeding port in a sliding mode, and the installation frame is connected with the feeding port in a sliding mode. And a filter screen is placed on the outer surface of the mounting frame in a clamped mode, the filter screen and the mounting frame are obliquely designed, and the mounting frame and the feeding opening are concentrically designed. According to the filter device for the fluoride salt feed opening of the electrolytic cell, fluoride salt added into the feed opening through a crown block can be filtered through the filter screen, and the filter screen can also filter impurities falling into the feed opening daily when the feed opening is not sealed; impurities in fluoride salt and impurities accidentally falling into the feeding port in daily use cannot enter the material box, and the impurities cannot enter the inside of the electrolytic bath to affect operation.

The application discloses a cast iron enamel low-temperature ground glaze free of fluorinated salt and nitrate, a preparation method and application thereof, and belongs to the technical field of enamel. The ground glaze is prepared from quartz, zero-water borax, soda ash, potassium carbonate, barium carbonate, potassium feldspar, magnesium carbonate, copper oxide, manganese oxide, aluminum oxide and recycled ternary battery positive electrode material according to specific mass proportions. The preparation comprises raw material mixing, smelting at 1230±10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of the smelting state. The ground glaze completely avoids the use of fluorinated salt and nitrate, eliminates the problems of fluoride emission and environmental protection equipment blockage from the source, the fluorine content of the product is not detected, and the limit value requirement of the EU REACH regulation is met. Meanwhile, by introducing the recycled ternary battery material, the adhesion of the ground glaze is obviously enhanced, the synergistic effect between components is strengthened, other performances are promoted, and resource recycling and cost reduction are realized.

The application discloses a steel plate enamel medium-temperature cobalt-nickel ground glaze free of fluorinated salt and nitrate, a preparation method and application thereof, and belongs to the technical field of enamel. The ground glaze is prepared according to specific mass proportions of quartz, zero-water borax, soda ash, potassium carbonate, calcium carbonate, potassium feldspar, copper oxide, iron oxide and recovered ternary battery positive material iron oxide. The preparation comprises raw material mixing, smelting at 1260±10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of a molten state. The ground glaze completely avoids the use of fluorinated salt and nitrate, eliminates fluorine emission and environmental protection equipment blockage problems from the source, the fluorine content of the product is not detected, and the product meets the limit value requirements of the EU REACH regulation. Meanwhile, by introducing the recovered ternary battery material, the adhesion of the ground glaze is obviously enhanced, the synergistic effect between components is strengthened, other performances are promoted, and resource recycling and cost reduction are realized.

The invention discloses fluoride-salt-free nitrate-free medium-temperature matte glaze for cast iron enamel as well as a preparation method and application of the fluoride-salt-free nitrate-free medium-temperature matte glaze, and belongs to the technical field of enamel. The matte glaze is prepared from quartz, borax pentahydrate, titanium dioxide, sodium carbonate, magnesium carbonate, calcium carbonate, barium carbonate, aluminum oxide, sodium tripolyphosphate and lithium carbonate according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1300 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. The matte glaze completely avoids the use of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are eliminated from the source, the fluorine content of the product is not detected through detection, and the limit value requirements of European Union REACH regulations are met. And meanwhile, the ceramic has a good ceramic surface and excellent sintering performance and matte performance, is suitable for a cast iron matrix, has the sintering temperature of 760-780 DEG C, and can be used for producing green and environment-friendly enamel products.

The invention discloses a fluoride-salt-free and nitrate-free cast iron enamel high-temperature ground coat as well as a preparation method and application thereof, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, barium carbonate, potassium feldspar, magnesium carbonate, copper oxide, manganese oxide, aluminum oxide and a recycled ternary battery positive electrode material according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1290 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. According to the ground coat, the use of fluoride salt and nitrate is completely avoided, the problems of fluoride emission and environmental protection equipment blockage are solved from the source, the fluorine content of a product is not detected, and the European Union REACH regulation limit value requirements are met. Meanwhile, by introducing the recycled ternary battery material, not only is the adherence of the ground glaze obviously enhanced, but also the synergistic effect among the components is enhanced, the improvement of other properties is promoted, and the cyclic utilization of resources and the reduction of cost are realized.

The invention discloses a fluoride-salt-free nitrate-free cast iron enamel medium-temperature ground coat and a preparation method and application thereof, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, calcium carbonate, barium carbonate, potassium feldspar, magnesium carbonate, copper oxide, manganese oxide, aluminum oxide, iron oxide and a recycled ternary battery positive electrode material according to a specific mass part ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1260 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing and detecting a molten state. According to the ground coat, the use of fluoride salt and nitrate is completely avoided, the problems of fluoride emission and environmental protection equipment blockage are solved from the source, the fluorine content of a product is not detected, and the European Union REACH regulation limit value requirements are met. Meanwhile, by introducing the recycled ternary battery material, not only is the adherence of the ground glaze obviously enhanced, but also the synergistic effect among the components is enhanced, the improvement of other properties is promoted, and the cyclic utilization of resources and the reduction of cost are realized.

The application discloses a steel plate enamel low-temperature nickel underglaze without fluorinated salt and nitrate, a preparation method and application thereof, and belongs to the technical field of enamel. The underglaze is prepared from quartz, zero-water borax, soda ash, potassium carbonate, calcium carbonate, potassium feldspar, sodium feldspar, recycled ternary battery positive material and antimony oxide according to specific mass proportions. The preparation comprises raw material mixing, smelting at 1230±10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of the smelting state. The underglaze completely avoids the use of fluorinated salt and nitrate, eliminates the problems of fluoride emission and environmental protection equipment blockage from the source, the fluorine content of the product is not detected, and the limit value requirement of the EU REACH regulation is met. Meanwhile, by introducing the recycled ternary battery positive material, the adhesion of the underglaze is obviously enhanced, the synergistic effect between components is strengthened, other performances are promoted, and resource recycling and cost reduction are realized.

The application discloses a steel plate enamel high-temperature cobalt-nickel ground glaze free of fluorinated salt and nitrate, a preparation method and application thereof, and belongs to the technical field of enamel. The ground glaze is prepared from quartz, zero-water borax, soda ash, potassium carbonate, trisodium phosphate, potassium feldspar, iron oxide and recycled ternary battery positive electrode material according to specific mass proportions. The preparation comprises raw material mixing, smelting at 1290±10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of the smelting state. The ground glaze completely avoids the use of fluorinated salt and nitrate, eliminates the problems of fluoride emission and environmental protection equipment blockage from the source, the fluorine content of the product is not detected, and the product meets the limit value requirements of the EU REACH regulation. Meanwhile, by introducing the recycled ternary battery material, the adhesion of the ground glaze is obviously enhanced, the synergistic effect between components is strengthened, other performances are promoted, and resource recycling and cost reduction are realized.

The invention relates to the technical field of dangerous solid waste treatment and resource utilization, in particular to an aluminum electrolysis overhaul slag fluoride enhanced leaching and resource recycling method. Comprising the following steps: adding pretreated overhaul slag into a complexing reaction solution of boric acid containing a dispersing agent and gluconate, and pulping; sealing the system, heating, and implementing pulse type micro-negative pressure degassing operation in which vacuumizing and normal pressure recovery are alternated during constant-temperature leaching; after the reaction is finished, carrying out thermal-state solid-liquid separation and tailing washing, and merging to obtain clear filtrate; crystal seeds are added into the filtrate, an aluminum source solution is dropwise added, the pH value is increased, solid-liquid separation is performed after constant-temperature curing, and synthetic cryolite is obtained; and supplementing the pH buffer agent to the clear liquid and then circularly returning to the liquid preparation process. According to the method, fluorine and aluminum are cooperatively extracted under the weak acid condition, generation of silicic acid gel is inhibited, equipment corrosion is reduced, mass transfer in pores is enhanced in combination with micro-negative pressure operation, and low-energy-consumption recovery of fluoride salt and closed-loop circulation of a working solution are achieved through pH regulation and control.

This invention discloses a five-component fluoride molten salt. The composition of the five-component fluoride molten salt is: 57.1–57.6 wt.% RbF, 8.2–8.6 wt.% LiF, 3.1–3.5 wt.% NaF, 16.6–17.0 wt.% KF, and 14.0–14.4 wt.% ZnF₂. This invention also discloses a method for preparing the five-component fluoride molten salt. This invention innovatively uses RbF as the main component, combined with appropriate amounts of Li, Na, K, and Zn fluorides, and for the first time proposes and prepares a five-component fluoride molten salt. This molten salt has a melting point of 410.0 ± 2.0 °C, a solid-liquid enthalpy change of 107.0 ± 6.0 J / g, a specific heat of 1.55 ± 0.55 J / g °C, and a decomposition temperature of 755 ± 2 °C. This molten salt has a melting point about 50°C lower than existing fluoride salt systems, exhibits excellent heat transfer and storage performance, can effectively improve the safety of heat transfer and storage systems, and has a wider range of application prospects.

This invention discloses a method for preparing a TiB2 coating that inhibits particle agglomeration during electrophoretic deposition, comprising the following steps: First, a fluoride salt mixture is prepared and divided into two parts. One part of the fluoride salt is mixed with boron powder and titanium dioxide powder, heated to form a molten salt, and the upper layer of molten salt is extracted. After rapid cooling, crushing, and grinding, TiB2-fluoride salt composite powder is obtained. Then, the other part of the fluoride salt is heated to form a base molten salt, and the TiB2-fluoride salt composite powder is added to the base molten salt. Electrophoretic deposition is then performed using a ring-shaped graphite anode and a cathode to be deposited. This method prepares highly dispersed TiB2-fluoride salt composite powder through in-situ synthesis, and then uses a ring-shaped anode to reduce the probability of TiB2 particle agglomeration during electrophoresis, effectively inhibiting particle agglomeration and improving the TiB2 electrophoretic deposition efficiency.

The application discloses a cast iron enamel low-temperature acid-resistant base glaze without fluorinated salt and nitrate, and a preparation method and application thereof, and belongs to the technical field of enamel. The base glaze is prepared from quartz, zero-water borax, soda ash, calcium carbonate, titanium white, potassium feldspar, lithium carbonate and recycled ternary battery positive electrode material according to specific mass proportions. The preparation comprises raw material mixing, smelting at 1300+ / -10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of the smelting state. The base glaze completely avoids the use of fluorinated salt and nitrate, eliminates the fluorine emission and environmental protection equipment blockage problem from the source, the fluorine content of the product is not detected, and the limit value requirement of the EU REACH regulation is met. Meanwhile, by introducing the recycled ternary battery material, the adhesion of the base glaze is obviously enhanced, the synergistic effect between components is strengthened, other performances are promoted, and resource recycling and cost reduction are realized.

The application discloses a steel plate enamel low-temperature cobalt ground glaze free of fluorinated salt and nitrate, a preparation method and application thereof, and belongs to the technical field of enamel. The ground glaze is prepared by mixing quartz, zero-water borax, soda ash, potassium carbonate, calcium carbonate, potassium feldspar, antimony oxide and cerium oxide according to specific mass proportions. The preparation comprises raw material mixing, melting at 1230±10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of the melting state. The ground glaze completely avoids the use of fluorinated salt and nitrate, eliminates the fluorine emission and environmental protection equipment blockage problems from the source, the fluorine content of the product is not detected, and the product meets the limit value requirements of the EU REACH regulation. Meanwhile, by introducing the recycled ternary battery material, the adhesion of the ground glaze is obviously enhanced, the synergistic effect between components is strengthened, other performances are promoted, and resource recycling and cost reduction are realized.

The application discloses a kind of CO2 Atmosphere under phosphogypsum pyrolysis resource processing technology and system, comprising: phosphogypsum is pyrolyzed under the acid synergy atmosphere formed by 600 DEG C-800 DEG C and CO2 and water vapor, realize the deep removal of eutectic phosphorus and other impurities, and output high-quality gypsum;Pyrolysis tail gas is recovered waste heat by heat exchanger, and acid waste water is generated by condensation;Waste water is recovered phosphate, fluoride and organic matter in turn by grading reaction under CO2 pressurized condition, and pollutants are converted into by-products;Purified waste water after treatment is preheated and reused in pyrolysis furnace, to realize waste water zero discharge;Part of CO2 in purified flue gas is recycled, which reduces carbon emission.The process realizes efficient purification of phosphogypsum, cascade utilization of waste heat and full recovery of valuable components at low temperature by building a closed-loop system, which significantly reduces energy consumption compared with traditional calcination process, and has no secondary pollution, with outstanding environmental and economic benefits.

The invention discloses a fluoride-salt-free and nitrate-free cast iron enamel low-temperature acid-resistant ground coat as well as a preparation method and application thereof, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, calcium carbonate, titanium dioxide, potassium feldspar, lithium carbonate and a recycled ternary battery positive electrode material according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1300 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. According to the ground coat, the use of fluoride salt and nitrate is completely avoided, the problems of fluoride emission and environmental protection equipment blockage are solved from the source, the fluorine content of a product is not detected, and the European Union REACH regulation limit value requirements are met. Meanwhile, by introducing the recycled ternary battery material, not only is the adherence of the ground glaze obviously enhanced, but also the synergistic effect among the components is enhanced, the improvement of other properties is promoted, and the cyclic utilization of resources and the reduction of cost are realized.

The invention discloses a fluoride-salt-free and nitrate-free cast iron enamel low-temperature ground coat as well as a preparation method and application thereof, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, barium carbonate, potassium feldspar, magnesium carbonate, copper oxide, manganese oxide, aluminum oxide and a recycled ternary battery positive electrode material according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1230 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing and detecting a molten state. According to the ground coat, the use of fluoride salt and nitrate is completely avoided, the problems of fluoride emission and environmental protection equipment blockage are solved from the source, the fluorine content of a product is not detected, and the European Union REACH regulation limit value requirements are met. Meanwhile, by introducing the recycled ternary battery material, not only is the adherence of the ground glaze obviously enhanced, but also the synergistic effect among the components is enhanced, the improvement of other properties is promoted, and the cyclic utilization of resources and the reduction of cost are realized.

The application discloses a steel plate enamel medium-temperature nickel underglaze without fluorinated salt and nitrate, a preparation method and application thereof, and belongs to the technical field of enamel. The underglaze is prepared from quartz, zero-water borax, soda ash, potassium carbonate, calcium carbonate, potassium feldspar, sodium feldspar, recycled ternary battery positive material and antimony oxide according to specific mass proportions. The preparation comprises raw material mixing, smelting at 1260±10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of the smelting state. The underglaze completely avoids the use of fluorinated salt and nitrate, eliminates the problems of fluoride emission and environmental protection equipment blockage from the source, the fluorine content of the product is not detected, and the limit value requirement of the EU REACH regulation is met. Meanwhile, by introducing the recycled ternary battery positive material, the adhesion of the underglaze is obviously enhanced, the synergistic effect between components is strengthened, other performances are promoted, and resource recycling and cost reduction are realized.

The utility model discloses a fluoride salt charging vehicle for an electrolytic aluminum factory, and particularly relates to the technical field of charging vehicles, the fluoride salt charging vehicle comprises a first vehicle body, a second vehicle body is arranged on one side of the first vehicle body, and a crushing and conveying assembly is arranged at the top of the second vehicle body. The crushing and conveying assembly is arranged, a hollow flow guide frame drives a plurality of first crushing plates and second crushing plates to rotate when rotating, the second crushing plates crush large material blocks in a gathering frame when selecting, and crushing rods perform secondary crushing on the crushed material blocks when rotating, so that the situation that the material blocks are large and block the device is effectively avoided, and the crushing efficiency is improved. Air flow flows between the gathering frame and the gathering cover, small materials generated by crushing are prevented from being stacked on the inner wall of the gathering frame, the crushed raw materials can also be discharged through the discharging pipe, the materials are conveyed through rotation of the conveying auger, and the poor crushing effect caused by too many materials in the gathering cover is effectively avoided.

The utility model discloses a purification device for electrolyzing system and electrolyzing system with the same, the purification device for electrolyzing system comprises a recovery articulated chute, the recovery articulated chute is provided with an air inlet, an air outlet and a feed opening, the feed opening is located between the air inlet and the air outlet, the height of the recovery articulated chute is gradually reduced from the air inlet to the air outlet; the fan is used for guiding the flow direction of gas in the recovery elephant trunk; the filtering piece is arranged between the air inlet and the discharging opening; the flue is provided with a feeding port, and the feeding port is located below the discharging port; the blanking pipe is respectively communicated with the feeding hole and the blanking hole; the valve body is arranged on the discharging pipe and used for controlling the discharging amount of the discharging pipe. According to the purification device disclosed by the embodiment of the utility model, secondary purification of the electrolysis flue gas can be realized, on one hand, the purification degree of the electrolysis flue gas is high, the purification efficiency is improved, and on the other hand, the consumption of fluoride salt in the electrolysis bath is reduced, and the electrolysis production cost is reduced.

The invention discloses a fluoride-salt-free and nitrate-free medium-temperature cobalt ground coat for steel plate enamel as well as a preparation method and application of the medium-temperature cobalt ground coat, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, calcium carbonate, potassium feldspar, antimony oxide, cerium oxide and a recycled ternary battery positive electrode material according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1260 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing and detecting a molten state. According to the ground coat, the use of fluoride salt and nitrate is completely avoided, the problems of fluoride emission and environmental protection equipment blockage are solved from the source, the fluorine content of a product is not detected, and the European Union REACH regulation limit value requirements are met. Meanwhile, by introducing the recycled ternary battery material, not only is the adherence of the ground glaze obviously enhanced, but also the synergistic effect among the components is enhanced, the improvement of other properties is promoted, and the cyclic utilization of resources and the reduction of cost are realized.

The invention discloses a fluoride-salt-free and nitrate-free high-temperature cobalt-nickel ground coat for steel plate enamel as well as a preparation method and application of the high-temperature cobalt-nickel ground coat, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, trisodium phosphate, potassium feldspar, ferric oxide and a recycled ternary battery positive electrode material according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1290 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. According to the ground coat, the use of fluoride salt and nitrate is completely avoided, the problems of fluoride emission and environmental protection equipment blockage are eliminated from the source, the fluorine content of the product is not detected, and the European Union REACH regulation limit value requirements are met. Meanwhile, by introducing the recycled ternary battery material, not only is the adherence of the ground glaze obviously enhanced, but also the synergistic effect among the components is enhanced, the improvement of other properties is promoted, and the cyclic utilization of resources and the reduction of cost are realized.

This utility model relates to the field of prebaked aluminum electrolytic cell technology, specifically a fluoride salt batching device for a prebaked aluminum electrolytic cell. It includes a mounting bracket, with a hydraulic cylinder and a storage silo mounted on top of the bracket. A drive motor, a mixing silo, a second drive motor, and a stirring rod are mounted on the outside of the mounting bracket. A third drive motor is mounted on the outside of the mixing silo, and its output is connected to a feeding rod. A discharge port is installed at the bottom of the mixing silo, and a servo motor is mounted at the top, with its output connected to a transmission rod. A weighing hopper is mounted on the transmission rod, and a weighing scale is installed at the bottom of the weighing hopper. After mixing, drive motors one and two are turned off, while drive motor three continues to operate. The mixing silo remains tilted, and the solenoid valve is opened to discharge the raw material through the discharge port. Drive motor three drives the feeding rod to rotate, preventing the raw material from clogging the discharge port, thus completing the batching process. This method ensures a fast discharge speed.

The utility model relates to a kind of related technical fields of batching equipment, specifically to a kind of intelligent aluminium electrolysis cell fluorizated salt constant volume unloader, comprising: bottom plate;The top of the bottom plate is provided with storage tank.This utility model is cooperated under the cooperation of bottom plate, storage tank, support rod, discharge port, fixed ring, transmission shaft and leakage prevention mechanism, not only can accurately control the discharge measurement of aluminium electrolysis fluorine salt, but also can quickly close discharge port at the same time when discharging ends, avoid a small amount of aluminium electrolysis fluorine salt continue to discharge, improve the accuracy of aluminium electrolysis fluorine salt discharge, solve the existing intelligent aluminium electrolysis cell fluorizated salt constant volume unloader Although aluminium electrolysis fluorine salt can be controlled to carry out quantitative discharge, but it does not have the function of preventing leakage, resulting in a small amount of aluminium electrolysis fluorine salt continue to discharge through discharge pipeline in the process of preventing leakage piston telescopic control discharge pipeline closure, so that aluminium electrolysis fluorine salt discharge exists error, and the problem of poor practicability.

The invention discloses a fluoride-salt-free and nitrate-free steel plate enamel high-temperature cobalt ground coat as well as a preparation method and application thereof, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, calcium carbonate, potassium feldspar, antimony oxide, a recycled ternary battery positive electrode material and cerium oxide according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1290 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. According to the ground coat, the use of fluoride salt and nitrate is completely avoided, the problems of fluoride emission and environmental protection equipment blockage are eliminated from the source, the fluorine content of the product is not detected, and the European Union REACH regulation limit value requirements are met. Meanwhile, by introducing the recycled ternary battery material, not only is the adherence of the ground glaze obviously enhanced, but also the synergistic effect among the components is enhanced, the improvement of other properties is promoted, and the cyclic utilization of resources and the reduction of cost are realized.

The invention relates to an oil and gas field blocking remover and a preparation method thereof, and belongs to the technical field of oil and gas development. The blocking remover comprises the following components in percentage by mass: 15%-25% of a polydentate chelating acid compound, 5%-8% of fluoride salt, 2%-5% of a surfactant compound, 1%-3% of a corrosion inhibitor, 2%-4% of a mutual solvent, 0.5%-1% of a dispersing agent and the balance of water, the polydentate chelating acid compound comprises amino trimethylene phosphonic acid and 1-hydroxyethylidene-1, 1-diphosphonic acid; and the surfactant compound comprises a quaternary ammonium salt type surfactant and a PO-EO block copolymer. The blocking remover provided by the invention can realize a good blocking removal effect on inorganic-organic composite blocking substances, is low in corrosion rate to a tubular column, reduces unnecessary damage to the tubular column, and has a wide market prospect. The invention further provides a preparation method of the blocking remover, and the preparation method is simple in process, low in requirements on environment and equipment and suitable for industrial application.

The invention discloses a fluoride-salt-free and nitrate-free medium-temperature titanium creamy yellow overglaze for steel plate enamel as well as a preparation method and application of the overglaze, and belongs to the technical field of enamel. The cover glaze is prepared from quartz, anhydrous borax, rutile, potassium feldspar, magnesium carbonate, trisodium phosphate, calcium carbonate, potassium dichromate and zinc oxide according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1300 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. The overglaze completely avoids the use of fluoride salt and nitrate, eliminates the problems of fluoride emission and environmental protection equipment blockage from the source, the fluorine content of the product is not detected through detection, the product meets the European Union REACH regulation limit value requirements, has good hue, luster and firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 800-840 DEG C and the firing time of 20-30 minutes, and can be widely applied to the production of steel plates. The method can be used for producing green and environment-friendly enamel products.

The invention discloses a fluoride-salt-free and nitrate-free medium-temperature nickel ground coat for steel plate enamel as well as a preparation method and application of the medium-temperature nickel ground coat, and belongs to the technical field of enamel. The ground coat is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, calcium carbonate, potassium feldspar, albite, a recycled ternary battery positive electrode material and antimony oxide according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1260 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing and detecting a molten state. According to the ground coat, the use of fluoride salt and nitrate is completely avoided, the problems of fluoride emission and environmental protection equipment blockage are solved from the source, the fluorine content of a product is not detected, and the European Union REACH regulation limit value requirements are met. Meanwhile, the recycled ternary battery positive electrode material is introduced, so that the adherence of the ground coat is obviously enhanced, the synergistic effect among the components is enhanced, the improvement of other properties is promoted, and the cyclic utilization of resources and the reduction of cost are realized.

The utility model relates to the technical field of aluminum electricity corollary equipment, in particular to a fluoride salt feeding vehicle feed opening dust collecting device which comprises a dust collecting cover, the dust collecting cover comprises a top pipe, a taper pipe and a bottom pipe, the inner wall of the top pipe is fixedly connected to a shell of a feeder, the top pipe is arranged above a flange at the lower end of the feeder, and the bottom end of the bottom pipe is arranged below the top face of a feed inlet of a feed box. According to the fluoride salt powder dust collection device, flying fluoride salt powder is limited in the dust collection cover through the arrangement of the dust collection cover, and then the flying fluoride salt powder is collected into the dust collection box through the arrangement of the negative pressure fan and the dust collection pipe; the problem that fluoride salt powder materials fly in the discharging process is fundamentally solved, fluoride salt dust is prevented from polluting the environment, and it is guaranteed that the working environment is clean and tidy.

The application discloses a kind of purification methods of crystalline graphite, belong to graphite purification technical field, the crystalline graphite with carbon content greater than 82% is pretreated with fluoride salt mixture, sodium chloride, dispersing agent, deionized water are added to the crystalline graphite after pretreatment, fluoride salt mixture, then again drying is obtained viscous mixture, heat treatment is carried out under inert atmosphere, high-carbon crystalline graphite can be obtained after washing with water.Hydrochloric acid, deionized water are directly added to the mixture after heat treatment, heated and stirred, after reaction, graphite is separated by filtration, and waste liquid is recovered and treated;The separated graphite is repeatedly washed with water, filtered, dried and crushed to obtain high-carbon crystalline graphite with carbon content higher than 99%.The high-carbon crystalline graphite obtained by the application has a water content of not more than 0.5%, an ash content of not more than 0.7%, and the finished product can be applied to electromagnetic shielding materials, antistatic materials, conductive materials, corrosion-resistant materials, lubricants, fireproof materials and the like.