Process for refining high-purity yellow phosphorus

Abstract

The invention discloses a manufacturing method of refined high-purity yellow phosphor, which comprises the following steps: adding 20-30% yellow phosphor into 70-80% water in the sandwich insulating furnace; heating to fuse into liquid pattern; doping 8-15% carbonate; heating to 70-75 Deg C; stirring; washing through 75-80 Deg C; stewing; sedimenting; making arsenic content less than 0.2PPM and each impurity content less than 300PPM; refining to obtain 5-6N high-purity yellow phosphor.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a production method of refined high-purity yellow phosphorus. Background technique [0002] High-purity yellow phosphorus is a doping source for the preparation of semiconductors and semiconductor materials, and is also a raw material for the production of electronically pure phosphorus oxychloride. According to the quality standard of high-purity yellow phosphorus, the content of arsenic should be less than 0.2PPM, and the content of other impurities should be less than 300PPM. In this regard, in order to achieve this content standard, various countries have conducted a large number of researches with different methods. [0003] Japanese Patent Laid-Open No. 5-116916 discloses that yellow phosphorus treated with concentrated nitric acid at 48-50°C lasts up to 12 hours to reduce the arsenic content in yellow phosphorus from 55PPM to below 10PPM. Japanese Showa 54-9369...

AI Technical Summary

Problems solved by technology

However, their production process is complicated, and the required conditions are harsh. A little carelessness will cause an explosion, and the safety is poor.