Process for producing high purity phosphates

A method for producing high purity sodium phosphate comprising:

• reacting phosphate rock with phosphoric acid to produce monobasic calcium phosphate;
• and
• reacting monobasic calcium phosphate with sodium carbonate to produce sodium phosphate.

A method for producing high purity potassium phosphate comprising:

• reacting phosphate rock with phosphoric acid to produce monobasic calcium phosphate;
• and
• reacting monobasic calcium phosphate with potassium carbonate to produce potassium phosphate.

A method for producing high purity ammonium phosphate comprising:

• reacting phosphate rock with phosphoric acid to produce monobasic calcium phosphate;
• and
• reacting monobasic calcium phosphate with ammonium sulfate to produce ammonium phosphate.

A method for producing high purity ammonium phosphate comprising:

• reacting phosphate rock with phosphoric acid to produce monobasic calcium phosphate;
• and
• reacting monobasic calcium phosphate with ammonium hydroxide to produce ammonium phosphate.

A method comprising:

• reacting phosphate rock with phosphoric acid to produce monobasic calcium phosphate;
• and
• reacting monobasic calcium phosphate with x-y to produce x-phosphate, where x is selected from the group consisting of lithium, sodium, ammonium and potassium and y is selected from the group consisting of carbonate, bicarbonate, hydroxide and sulfate.