New PDF release: Applied Chemistry at Protein Interfaces

By Gould R.F. (ed.)

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The total sulfur content of cleaned PT8 coal was ainalyzed by observing the various sulfur forms after d i f f e r e n t washing procedures. Results of these analyses are presented in Table I I I . Use of a 2L wash under standard condi­ tions (run #3) showed an appreciable residue of sulfateinthe cleaned coal, greater than the amount of sulfate present in the orig­ i n a l , untreated coal. Such incorporation of sulfate after treatment with HjSO^ of chemically cleaned coals has been observed before in our laboratories ( 14_).

0 M concentration appeared optimum. Coal recovery was affected by ciïanges in various parameters as for the other coals, but it was s l i g h t l y higher for any given set of conditions in the case of Lower Kittanning c o a l . The greatest d i f f e r e n c e in r e s u l t s with t h i s coal occurred with the removal of ash-forming minerals, because the two-step treatment appeared i n e f f e c t i v e except under r e l a t i v e l y mild a l k a l i n e leaching conditions. Only by carrying out the f i r s t step at a r e l a t i v e l y moderate temperature ( i .

5 · At the end of disper­ sant conditioning time ( 5 minutes), k mg/1 Purifloc-A22 was admini­ stered into the suspension, and s t i r r i n g was continued for 10 seconds at high shear, then lowered t o a gentle a g i t a t i o n for an additional. 1 0 seconds. The suspension was transferred into a 100-ml graduated cylinder and was allowed t o stand s t i l l f o r 5 minutes. At the end of the s e t t l i n g period, the suspended s o l i d s were de­ canted, and the s e t t l e d s o l i d s were recovered.

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Applied Chemistry at Protein Interfaces by Gould R.F. (ed.)

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