7 results about "White Phosphorus" patented technology

The application discloses a method for producing phosphorus pentafluoride by electrolysis. The method is to use white phosphorus and anhydrous hydrogen fluoride as raw materials, fluorometal salt or quaternary ammonium fluoride salt as conductive agent, and to carry out electrolysis reaction in a high-nickel anode electrolysis container to produce phosphorus pentafluoride. The preparation method can produce high-purity phosphorus pentafluoride in one step, and the impurities are few when used for synthesizing lithium hexafluorophosphate, and no additional hydrogen chloride gas is produced, the post-processing cost is lower, and the production process is safer and more efficient. In addition, the electrolysis reaction condition is mild, the by-product waste is less, the environmental pollution is small, and the phosphorus pentafluoride gas with a purity greater than 99.99% can be obtained.

The invention discloses a phosphorus recovery system and method for MBE equipment. The phosphorus recovery system comprises a phosphorus recovery cavity, a cooling adsorption unit and a heating conversion unit, one end of the phosphorus recovery cavity is connected to the MBE cavity through a pipeline with a first control valve, and the other end of the phosphorus recovery cavity is connected to the vacuum pump through a pipeline with a second control valve, so that phosphorus-containing gas in the MBE cavity enters the phosphorus recovery cavity; the cooling adsorption unit is arranged at the upper part of the inner side of the phosphorus recovery cavity and is used for cooling and adsorbing phosphorus-containing gas in the phosphorus recovery cavity; the heating conversion unit is arranged at the bottom of the phosphorus recovery cavity and used for converting white phosphorus adsorbed and collected by the cooling adsorption unit into red phosphorus. The device has the advantages of being compact in structure, convenient to operate, high in reliability and the like, the risk of phosphorus spontaneous combustion is greatly reduced, safety accidents are avoided, the whole phosphorus recovery system does not need to be disassembled and assembled independently for professional treatment, normal epitaxial growth of the MBE system is not affected, and manpower and material resources are relatively saved.

This invention discloses a method for removing white phosphorus from soil. First, contaminated soil is mixed evenly with water, stirred, and then nitric acid solution is added. After stirring, a phosphorus removal agent is added, and stirring continues. The mixture is then filtered, freeze-dried, and the phosphorus removal agent is removed using a magnetic sieve to obtain treated soil. The phosphorus removal agent contains nano-ferric oxide, allowing it to separate from the soil via magnetic attraction after treating the white phosphorus, reducing the difficulty of separation and enabling reuse. The soil is treated with nitric acid, causing the white phosphorus to react with the nitric acid to produce phosphate ions. The addition of the phosphorus removal agent releases lanthanum carbonate from the surface. Lanthanum has strong Lewis acidity and can form strong ligands with phosphate, which has Lewis basicity, to adsorb phosphate ions from the soil, thus forming a complex. Simultaneously, the free amino groups on the chitosan surface can adsorb metals, further completing the adsorption of the complex.

This invention relates to the field of etching technology, and in particular to an etching solution and etching method. The etching solution of this invention comprises, by mass percentage: 5wt%–18wt% nitric acid, 2wt%–6wt% glacial acetic acid, 2wt%–5wt% white phosphorus, and 2wt%–8wt% iron oxide. The etching solution of this invention exhibits excellent etching ability and stability, improves the etching morphology, and reduces etching film thickness deviation. Using the etching solution of this invention to etch steel plates to obtain pad printing steel plates improves the flatness, smoothness, brightness, and gloss of the surface of the concave-plate printing images, ensures the matching degree of film thickness for large and small images, thereby increasing the service life of the pad printing and saving pad printing costs.

The invention relates to the technical field of battery negative electrode materials, in particular to a phosphorus-carbon negative electrode material production device and a preparation method, and the preparation method comprises the following operation steps: placing activated carbon in a closed container, and then carrying out vacuum heat treatment on the closed container; injecting molten white phosphorus into the closed container in proportion, and mechanically stirring and uniformly mixing; heating the closed container and continuously stirring; the temperature in the closed container is adjusted to the conversion temperature, and heat preservation is conducted; cooling the closed container, injecting alkali liquor into the closed container after cooling, heating for alkali washing, discharging waste gas generated during alkali washing out of the closed container, and further treating the waste gas; and washing, drying and packaging. By adopting the specific device, the problem that white phosphorus and activated carbon are difficult to compound is solved, the phosphorus-carbon negative electrode material is prepared by taking cheap white phosphorus as a phosphorus source, the production cost of the phosphorus-carbon negative electrode material is remarkably reduced, and the preparation method is safe, efficient and easy to operate and does not influence the deposition efficiency of phosphorus.

The invention provides a phosphorus-carbon negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing porous carbon and an amine solution of red phosphorus for dipping to obtain mixed slurry, and carrying out solid-liquid separation to obtain filtrate and filter residues; drying the filter residue to obtain a solid; and adding the solid into the filtrate, and repeatedly carrying out mixed impregnation, solid-liquid separation and drying until the filtrate is used up to obtain the phosphorus-carbon negative electrode material. According to the preparation method, a liquid phase deposition method is adopted, the deposition amount of red phosphorus particles in the pore structure of the porous carbon matrix is increased, meanwhile, the risk of producing white phosphorus can be effectively reduced, the safety performance of the phosphorus-carbon negative electrode material is improved, and large-scale production is facilitated.

The application provides a trialkyloxyphosphine compound derivative shown in formula (I) and a preparation method thereof. The trialkyloxyphosphine compound derivative is an organic phosphorus compound with a structure similar to that of trialkyloxyphosphine, which is directly synthesized by using white phosphorus. The process method avoids the use of highly polluting chlorine gas and subsequent emission problems in traditional phosphorus chemical production, and is a more environmentally friendly production method. In addition, the method disclosed by the application has simple steps, mild reaction conditions, simple post-treatment, and can obtain a yield of more than medium.