الفهرس 
ExperimantalOnly 14 pages are availabe for public view
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Abstract
Phosphoric acid is one of the most important raw materials for the production of a series of essential products for the human life today. Examples are mineral phosphate fertilizers which are used in millions of tons in the agricultural industry. Enormous quantities of phosphates are important for the production of essential basic food. So, the major goal of this study is to purify phosphoric acid from the suspended solids, iron, fluoride, copper and cadmium. The present study is classified into four parts as: 1) Removal of solids :Three types of clays (Kaolinite, Vermiculite or Bentonite ) were used to remove the suspended solids and humic acids present in the phosphoric acid. 2) Removal of iron: The removal of iron was achieved by treatment of phosphoric acid with different methods. The most suitable method is the addition of potassium amyl xanthate. 3) Removal of fluoride :Six methods were used to reduce the fluoride content from the phosphoric acid. Silicon dioxide, sodium silicate, potassium sulfate, sodium sulfate, mixture of silicon dioxide and potassium sulfate or potassium amyl xanthate were used. 4) Removal of copper and cadmium : Copper can be reduced by 92.86 % removal efficiency by addition of 1g potassium amyl xanthate/ 100mL acid. Also, the copper content decreases by increasing the addition of potassium amyl xanthate.