| 主权项 |
1. Process for the production of phosphoric acid comprising at least one step of mixing sulphuric acid with a mass in reaction, thereby obtaining a homogeneous mixture, said mass in reaction including a mixture of phosphorite, calcium sulphate crystals, sulphuric acid, phosphoric acid and water, wherein said mixing is made faster than the germination times of calcium sulphate hemihydrate crystals and also of calcium sulphate dihydrate crystals in order to prevent the spontaneous germination of said hemihydrate and dihydrate calcium sulphates and comprising a step of controlled production of calcium sulphate dihydrate germs. |
