How to do swelling expansion of bentonite?
Main instruments and reagentsL, with a plug (100 ml, about 25 mm in diameter)2, hydrochloric acid solution (1N), take 83 ml of hydrochloric acid, water diluted to 1000 ml, shake well
Determination of expansion timesBentonite water has obvious expansion performance, mixing with hydrochloric acid solution, has expanded volume, called the expansion times in ml / g sample. It said the price of the same content and colloid and montmorillonite, and belongs to the type of bentonite is closely related to the same type of bentonite the soil containing smectite. The expansion times higher. Therefore, the expansion times but also to identify the technical index of bentonite ore belongs to the type and value of bentonite quality.
Operation procedureL, say, take 1 grams of sample and add 100 ml of water to 30~40 ml of waterIn the cylinder, add water to the 75 ml mark2. Close the plug and shake for 3 minutes, so that the sample is fully dispersed, mixed with water, in the bright observation, no obvious particle mass can be3. Open the stopper. Add 25 ml lN hydrochloric acid solution, then plug the plug and shake for 1 minutes4, will be placed in the cylinder is not affected by the vibration of the table, standing 24 hours, the scale read precipitate interface value, namely the expansion times in ml / g sample.
discussThe swelling property of L and high quality sodium bentonite is good, and the degree of shaking and dispersion has obvious influence on the result. Therefore, the time of shaking should be controlled strictly under the premise of sufficient shaking2, acidic bentonite expansion times of less than 5 ml / g of some kind. But a no less than 5 ml scale, not accurate readings, can be "5 ml / g sample.
