TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The organic phase comprises at least a film agent collecting impurity ions, carrier taking impurity ions, and back-extraction agent having fluid film agent of purity water or/and diluted acid solvent. The film-producing agent in organic is kerosene, normal butane or trichloromethane; carrier is trichloromethane methyl amine and/or alkylamine; stabilizer is sulfonating polybutadiene and/or polyisobutylenesuccinyl imide; and stripping agent in emulsifiable solution liquid film is pure water. The film preparing agent in organic phase is coal oil, n-hexane or chloroform; carrier is dinonyl naphthalene sulfonic acid and/or di-(2-ethylhexyl) phosphoric acid; stability agent is sulfonating polybutadiene and/or polyisobutylene succinyl imide; stripping agent containing emulsion film agent is diluted acid solvent of hydrochloric acid, hydrogen nitrate or sulfuric acid. The emulsion film agent for removing fluorine ion impurity and anode impurity in phosphoric acid is micro-emulsion film agent prepared by organic phase having film preparing agent and carrier, with ratio of 0.4-0.6:0.4-0.5; fluid film agent with collected impurity ion is stripped out brought ion impurity by recovering and recovery stripping agent in fluorine ion recovering tower and anode recovering tower. In micro-emulsion film agent for removing fluorine ion impurity in phosphoric acid, where the film preparing agent in organic phase is coal oil, n-hexane and chloroform; carrier is chloridizing trialkyl methyl amine or/and alkylamine (TOA), or dinonyl naphthalene sulfonic acid (HD) and/or di-(2-ethylhexyl) phosphoric acid; stripping agent constructed emulsion film agent is pure water; and recovering and recovery stripping agent is pure water and/or diluted acid solvent of hydrochloric acid, hydrogen nitrate, phosphoric acid or sulfuric acid. Preferred Compositions: The ratio of organic phase of fluid film agents for removing fluorine ion impurities and metal positive ions impurities in phosphoric acid and extracting agent is 1:1-1.3. The organic phrase comprises 0.4-0.6:0.4-0.5:0.02-0.035 film-producing agent, carrier and stabilizer. Preferred Methods: The positive ion removing reaction is processed twice in crude phosphoric acid using metal positive ion removing fluid film agent and removing fluid film agents carrying different positive ion impurities from positive ion removing towers into two positive ion reclaiming towers to reclaim different metal elements. The emulsifiable solution liquid film trapping the impurity uses 5-7 V high pressure electronic fields at fluorine ion recovery tower and positive ion tower.