5Perry R H, Chilton C H, Kirkpatrick (eds.)S D. Chemical Engineers, Handbook [ M ] .4%d.New York: McGraw-Hill, 1963.
6Nickerson J D. Acidic phosphoric solutions:US,3118730 [ P ]. 1964-01-21.
7Woether C J. Production of clarified acidic phosphoric solutions: US, 3099622 [ P ]. 1963-07-30,
8Satterwhite. Suspension of solid impurities in wet process phosphoric acid : US, 3408162 [ P ] .1968-10-29.
9Gilchrist .1 G. Method for the production of phosphoric acid: US,3122d-15 [ P ] .1964-02-25.
10Vivian Asdey C, Jcdy Taravella J. Method for producing stabilized wet process phosphoric acid with low content of magnesium and aluminum:US,4710366[ P ] .1987-01-12.