Method for production of calcium compounds
AssigneeElkem Solar AS
InventorsTorfinn Buseth, Einar Andersen
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Abstract
The present invention relates to a method for production of calcium compounds having very low content of phosphorus and boron from an impure calcium chloride, solution containing phosphorus and boron, which method comprises the following steps: a) addition of a FeCl3-solution to the calcium chloride solution, b) adjusting the pH of the solution by addition of a base to between 3 and 9.5 for precipitation of iron hydroxide, iron phosphate and boron compounds, c) removal of the solid precipitate from the solution in step b) obtaining a purified calcium chloride solution, d) precipitation of a calcium compound from the solution from step c), and e) separation of the calcium compound from the solution in step d).
Claims10
A method for production of calcium compounds having very low content of phosphorus and boron from an impure calcium chloride solution containing phosphorus and boron, wherein the method comprises the following steps:
- a) adding a FeCl3-solution to the impure calcium chloride solution;
- b) adjusting the pH of the resulting solution from step a) by addition of a base to between 3 and 9.5 for precipitation of iron hydroxide, iron phosphate and boron compounds;
- c) removing a solid precipitate of iron hydroxide, iron phosphate and boron compounds from the solution resulting from step b);
- d) precipitating a calcium compound from the resulting solution from step c);
- and
- e) separating the calcium compound from the solution resulting from step d), the calcium compound with very low phosphorus and boron content.
Dependencies are inferred from the claim text.