Treatment of phosphate rock with acids

Abstract

Abstract PHOSPHATE ROCK IS DECOMPOSED BY TREATMENT WITH SOLUTION OF ACID SELECTED FROM THE GROUP OF ACIDS NAMED IN THE SPECIFICATION, USING A PROPORTION OF ACID SUFFICIENT TO SUBSTANTIALLY COMPLETE THE DECOMPOSITION OF THE CALCIUM FLUOPHOSPHATE OF THE USED PORTION OF THE PHOSPHATE ROCK. THERE IS PROVIDED AND USED IN THE ACID TREATMENT OF THE PHOSPHATE ROCK A REACTING COMPOUND OF ALUMINUM USED IN THE PROPORTION STATED IN THE SPECIFICATION, WITH THE RESULT THAT THE FLUORINE OF THE TREATED PHOSPHATE ROCK CHEMICALLY REACTS AND COMBINES WITH ALUMINUM OF THE USED COMPOUND OF ALUMINUM TO FORM A COMPOUND OF ALUMINUM AND FLUORINE. SEPARATE COMPOUNDS OF (1) SUBSTANTIALLY FLUORINE-FREE ARTIFICIAL PHOSPHATE AND (2) OF ALUMINUM-FLUORINE COMPOUND OF RESULT, WHICH MAY BE RECOVERED SEPARATELY IN AN ARIFICIAL PHOSPHATE PRODUCT AND A SOLID FLUOALUMINATE PRODUCT. SULPHUROUS ACID FORMED WHEN A STREAM OF GAS FROM COMBUSTION OF A SULPHUR-CONTAINING SUBSTANCE IS BROUGHT INTO AN AQUEOUS SOLUTION, MAY BE USED AS THE ACID OF TREATMENT OF PHOSPHATE ROCK, MYSELF HAVING DISCOVERED THAT WHILE PHOSPHATE ROCK IS REFRACTORY TOWARD SO-OBTAINED SULPHUROUS ACID, PHOSPHATE ROCK IS CHEMICALLY DECOMPOSABLE BY SUCH SOLUTION OF SULPHUROUS ACID CONTAINING A REACTABLE ALUMINUM COMPOUND. AS A RESULT OF MY DISCOVERY THE RECOVERY AND UTILIZATION OF SULPHUR DIOXIDE FROM GAS STREAMS RESULTING FROM THE BURNING OF SULPHUR-CONTAINING SUBSTANCES IS MADE PRACTICAL AND USEFUL. NEW AND USEFUL PHOSPHATE PRODUCTS RESULT FROM THE USE OF MY SAID DISCOVERY.

Inventors

• 👤 Anson G Betts

Bibliographic Details