The Electric Field Purification Preparation Of Refined Yellow Phosphorus Pilot Study

The yellow phosphorus is a kind of very important foundation material for industry, it mainly makes the red phosphorus, the phosphoric acid and it is also phosphorous material compound , in addition it also uses in the chemical industry, the agricultural chemicals and so on. The high pure yellow phosphorus which is purified from yellow phosphorus or red phosphorus will be used in electronic chemistry, semi-conducting material industry, pharmaceutical industry and martial industry and so on.This paper introduced phosphorus resources distribution and the reserves of our country , has enumerated the yellow phosphorus production and the using condition in YunNan province. It has made a brief outline on the present industrial yellow phosphorus production technology situation and it has analyzed the present yellow phosphorus production method and the principle , it also has made the elaboration to its flow and the production craft.The paper has made a detailed discussion on the yellow phosphorus present purification situation and the Using status, the yellow phosphorus purification method main include the chemical method and the physical method, in which chemical method mainly includes the iodide method, chloric compound method, the acid treatment method and the ferric method, the aqueous phase oxo-process, then the physical method mainly includes the distillation and the adsorption method.This paper has expatiated the microscopic electric polarization principle and has analyzed several kinds of locomotor state to the electric charge, the statics and dynamics phenomenon caused by the electrostatic force and the phenomenon of uniform electric field and inhomogeneous electric field granule movement. Through the comparative computation, we discovered that the yellow phosphorus and impurities (As, Fe, etc) has remarkable different properties (resistivity, negativity, ionization potential, etc) , based on these properties we can make impurities polarized by different charges in high voltage electric field ,then using the electrophoretic force to separate it.According to the experimental principle we have designed a yellow phosphorus purifier equipment, and designed many kinds of experimental technics, according to the data collected and the theoretical analysis, we know that the experimental influence factor is the electric-field intensity, the response time, the electrode spacing, the flux proportion on material's discharge relative velocity. Therefore, we have done large numbers of experiments based on these factors, finally we confirmed the best experimental conditions are: temperature 55℃, voltage 20kV, time 90 minutes, purification yellow phosphorus exportation and high arsenic yellow phosphorus exportation relative velocity proportion at 10:1, electrodeΦ90mm. in that condition the arsenic elimination rate can be achieved 58%. The experiment takes the former product as material, after thrice processing the arsenic content is below 20ppm, at the same time the ratio of eliminated arsenic is 94% ,and the impurity elimination effect is also very good, the phosphorus' returns-ratio more than 99.9% after that processing the yellow phosphorus color becomes transparent.Using the electric field purification method we may carry on the liquid state or the molten material disposing impurity, including the crude oil dehydration, non-metallic inclusions eliminating in the metallurgy domain, high-pressured static electricity ion water disposal in circulating water industry. In addition it also uses in the high-pressured static electricity dust removal, food high-pressured electrostatic field sterilizing and maintaining fresh .This technology of removing the impurity under the electric field function is being researched and applied in multitudinous industries.In the day which the world generally takes environmental protection in mind, in order to realize the true environmental protection we need to bring cleaning production to layout ,only by that we can realized the real cleaning production .This experimental study exploration uses high pressure electrostatic field method to purify yellow phosphorus, doesn't use the chemical additive, the energy consumed in this method is low, the impurity in industry yellow phosphorus is concentrate in the sideline product, the phosphorus' returns-ratio is high, it doesn't produce rejectamenta . It has fundamentally solved the "three-waste-processing" problem.