Zeta potential of coal fines in aqueous suspension.
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概要
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Zeta potential measurements of coal are useful for the coal fines processing technology. It is important to find out why the different types of coal have different values of zeta potential at the same pH values of suspension. Although the zeta potential is the nature of the surface of the coal particles in suspension, we attempted to relate the zeta potential to their elemental components on the basis of the simplest idea that the chemical component ratio at the coal surface without any surface oxidation effect is proportional to that of the bulk chemical composition. The empirical equation of the relation between the zeta potential of the particles and the chemical components of coal samples was determined in aqueous suspension with different pH values. The equation is represented as follows:<BR><I>Z</I>=<I>B<SUB>C</SUB></I>×<I>(C)</I>+<I>B<SUB>H</SUB></I>×<I>(H)</I>+<I>B<SUB>O</SUB></I>×<I>(O)</I>+<I>B<SUB>N</SUB></I>×<I>(N)</I>+<I>B<SUB>S</SUB></I>×<I> (S) </I>+<I>B<SUB>A</SUB></I>×<I> (A) </I>, <BR>where Z is the zeta potential (mV) of the particles, <I>(C)</I>, <I>(H)</I>, <I>(O)</I>, <I>(N)</I>, <I>(S)</I> and <I>(A)</I> are weight percent of carbon, hydrogen, oxygen, nitrogen, sulphur and ash, respective-ly, and <I>B<SUB>C</SUB></I>, <I>B<SUB>H</SUB></I>, <I>B<SUB>O</SUB></I>, <I>B<SUB>N</SUB></I>, <I>B<SUB>S</SUB></I> and <I>B<SUB>A</SUB></I> are coefficients (mV %) of each respective components of the coal samples. Using the data of thirteen samples, the above coefficients were calculated numerically by the least square method in suspensions with different pH values. When the chemical components of a coal sample are known, the zeta potential of the coal fines can be determined by the equation with those coefficients.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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