6results about How to "Crystallize fast" patented technology

This invention relates to a method for preparing potassium fluorotantalate from tantalum solution, comprising the following steps: heating and conversion of the solution, transferring the potassium fluorotantalate crystallization solution, cooling and crystallizing the potassium fluorotantalate, discharging the potassium fluorotantalate crystallization mother liquor, washing the potassium fluorotantalate crystals, discharging the potassium fluorotantalate crystals, and drying the potassium fluorotantalate crystals. The beneficial effects are: the method of this invention is suitable for preparing potassium fluorotantalate from tantalum solution with a tantalum oxide concentration of 50 g / L to 80 g / L; high-concentration tantalum solutions do not require dilution with deionized water, saving conversion reaction materials; before adding the potassium fluorotantalate crystallization solution to the crystallization washing tank, hot water is circulated through the media jacket to preheat the crystallization washing tank, preventing excessively rapid cooling when the potassium fluorotantalate crystallization solution is added to the crystallization washing tank, thus preventing the formation of a large number of crystal nuclei or the generation of fine crystals, while allowing sufficient time for crystal growth.

The invention discloses a wear-resistant quick-dry hot-melt marking material and a preparation method thereof, and relates to the technical field of marking coatings. The wear-resistant quick-dry hot-melt marking material prepared by the invention is prepared from modified petroleum resin, titanium dioxide, filler, glass beads, crosslinked polyethylene wax and auxiliaries, the modified petroleum resin is prepared by reacting hydroxyl hyperbranched polysiloxane, epoxy polyol, dimethyl triphenylmethane tetraisocyanate and amino polysulfide rubber in petroleum resin, so that the strength and the heat resistance are effectively improved, and the service life of the hot-melt marking material is prolonged; the cross-linked polyethylene wax is prepared by reacting polyoxyethylene ether maleic anhydride with polypropylene carbonate and then cross-linking with polyethylene wax, and the polyoxyethylene ether maleic anhydride is prepared by copolymerizing diallyl polyoxyethylene ether and maleic anhydride, so that the drying time can be shortened.

The composite coating material of the present invention comprises a three-layer structure. In the middle layer, based on 100 parts by weight of sodium acetate trihydrate, the amount of borax nucleating agent is controlled at 5.1-9.6 parts by weight, which enables the surface temperature of the composite coating material to be controlled at 40±1.5℃, meeting the usage requirements of traditional Chinese medicine ironing.

The present application relates to the technical field of carbon dioxide emission reduction, and relates to an electrochemical enhanced evaporation crystallization closed-loop carbon dioxide recovery method and device. A low electric field is applied to an electrochemical absorption unit containing alkali absorption liquid, so that carbon dioxide is accelerated to convert into carbonate or bicarbonate in potassium hydroxide / potassium carbonate solution. Subsequently, the carbonate-rich solution is introduced into an evaporation-interface crystallization unit composed of hydrophilic fibers, industrial waste gas waste heat is used to drive interface evaporation, and efficient crystallization of potassium carbonate is realized in the designated area of the fibers. The aqueous solution of solid potassium carbonate and / or the uncrystallized mother liquor is sent into an electrochemical regeneration unit, potassium hydroxide is regenerated by electrochemical method, and high-purity carbon dioxide is released, so that the closed-loop process of absorption-crystallization-regeneration is realized. The present application has the advantages of low regeneration energy consumption, avoidance of high-temperature calcination, efficient and controllable crystallization, and modulization and amplification, and is suitable for carbon dioxide-containing waste gas emission reduction and resource utilization in the steel, chemical, power and other industries.

This invention relates to the field of lithium-ion battery cathode material technology, specifically a high-performance lithium-rich manganese-based cathode material based on pretreated boron nitride, its preparation method, and its application. The preparation method includes: introducing hydroxyl and amino groups onto the surface of boron nitride nanosheets; preparing a composite precursor powder by mixing a nickel-cobalt-manganese hydroxide precursor, a lithium source, TiO2, a phosphorus source, and pretreated boron nitride; sequentially performing conventional pre-calcination, a first-segment Joule heat treatment, and a second-segment Joule heat treatment; performing a third-segment instantaneous Joule heat treatment, followed by quenching; by introducing a surface-functionalized high thermal conductivity boron nitride network into the bulk phase of the material, and combining a programmed sequential heat treatment of "pre-calcination-two-segment Joule heat treatment" with instantaneous surface melting and quenching, this method effectively solves the inherent thermal gradient problem of the Joule heating method, simultaneously achieving high bulk phase homogenization and surface stabilization, resulting in a product with excellent comprehensive electrochemical performance.

This invention discloses a liquid sulfur granulation system and a liquid sulfur granulation method. The liquid sulfur granulation system includes a liquid sulfur pump (1), a sulfur feeding device (2), a sulfur forming facility (3), a vibrating screen (4), and a pre-crystallization facility (16), the pre-crystallization facility (16) having a pre-crystallization chamber. The liquid sulfur granulation method involves mixing fine sulfur powder separated by the vibrating screen (4) with liquid sulfur from the liquid sulfur pump (1) in the pre-crystallization chamber of the pre-crystallization facility (16). The fine sulfur powder acts as a seed crystal, inducing the liquid sulfur to pre-crystallize and form pre-crystallized crystal nuclei. The liquid sulfur containing the pre-crystallized crystal nuclei undergoes heat exchange with cooling water in the sulfur forming facility (3), cooling and forming into solid sulfur particles. This invention can be used for liquid sulfur granulation.