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| An improved method for determination of calcium fluoride in fluorite by EDTA titration |
| Received:March 01, 2019 Revised:March 11, 2019 |
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| DOI：10.3969/j.issn.2095-1035.2019.04.009 |
| KeyWord:calcium fluoride; EDTA; titration; calcium fluoride. |
| Author | Institution |
| zhangyue |
长春黄金研究院有限公司 |
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| Abstract: |
| A method for determination of calcium fluoride in ore by EDTA titration was established. Calcium acetate was introduced as the solvent to dissolve the sample, calcium carbonate in the sample was dissolved, and the solubility of calcium fluoride was reduced by the same ion effect. In the experiment, the relationship between the concentration of calcium ions and the solubility of calcium fluoride was explored, and the optimal concentration (10 g/L) containing calcium acetic acid was determined through comparative experiment. At the same time, other conditions in the experiment were also explored and optimized, and the optimal experimental conditions were determined as follows: the minimum weighing sample size was 0.5 g. Washing and precipitation water consumption is about 50 mL; The washing times of the second filtration were 8~10 times.The amount of potassium hydroxide added in titration was 20 mL. The precision (0.10%) and accuracy (0.08%) of the method can meet the experimental requirements. |
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