The name is absent



Chapter 4

significant at higher pH and kaolinite is more water-wet. At the same pH, adding

silicate can make kaolinite more water-wet than adding NaOH. NaOH only has

caustic effect to increase pH. For silicate, besides caustic effect, adsorption of
silicate ion on kaolinite positively-charged sites can make the surface of kaolinite

more negatively-charged and make kaolinite become more water-wet.

100


Wettability test

80

60

40

20

Control 24 ppm NaOH 37 ppm silicate 200 ppm NaOH 366 ppm silicate

Figure 4.4 Water-wet fraction of kaolinite with different amount of naphthenate
adding NaOH/ Na2SiO3 at different pH


Figure 4.5 shows water-wet fraction of 1.0 w.% kaolinite in toluene-brine
mixture (1:1, v∕v) with 100 ppm naphthenate adding NaOH/ Na2SiO3 at different
pH 24 hours after preparation. Kaolinite becomes more water-wet as pH

95



More intriguing information

1. Unemployment in an Interdependent World
2. Regional specialisation in a transition country - Hungary
3. Should informal sector be subsidised?
4. The name is absent
5. Reputations, Market Structure, and the Choice of Quality Assurance Systems in the Food Industry
6. The name is absent
7. An Economic Analysis of Fresh Fruit and Vegetable Consumption: Implications for Overweight and Obesity among Higher- and Lower-Income Consumers
8. Non-causality in Bivariate Binary Panel Data
9. The name is absent
10. The name is absent