Calcium silicon steps

2.3.1 imbibe pipetted sample buy silica 50ml, 250ml placed in a plastic cup;
2.3.2 Add 10 ~ 15ml of nitric acid with stirring, cooling to room temperature 30 ℃;
2.3.3 potassium chloride solution was added and stirred until a little saturated potassium chloride precipitated, was added 10ml, 15% potassium fluoride solution was placed carefully stirred 20min;
2.3.4 medium speed filter paper and washed with 5% potassium chloride solution 20ml plastic cup and the precipitate was washed three times;
2.3.5 garnet manufacturers the filter paper is placed along with the original precipitate plastic beaker, add 10ml of potassium chloride - ethanol solution and 1ml of phenolphthalein indicator;
2.3.6 stirring constantly with 0.15MNaOH and not washed in acid until the solution appears red, add 200ml boiling water and use 0.15MNaOH neutralized to phenolphthalein reddish
2.3.7 Sio2 content is calculated as the percentage of
Tsio2 × V × 5
Sio2 = × 100
m × 1000