Polyxanthate dispersant

As reported earlier (8j, polyxanthate dispersants can be prepared by reacting low molecular weight polyacrylic acid solutions with sodium hydroxide and carbon disulfide. Thus, to a 50-ml 1 percent... 

The polyxanthate dispersant, rather than improving the dispersion of pyrite, simply did not adsorb on the coal particles, thereby creating a selective dispersion action for the pyrite. These observations in Figure 2(B) were repeated and noted several times, even with purified PAAX solutions. Selective dispersion of pyrite or... 

Preliminary testing of the unpurified polyxanthate dispersant mentioned earlier, during the selective flocculation of three high sulfur coals, is described here. The coal samples used for the study were Kentucky No. 9, Meigs Creek, and Ohio No. 6. The coal... 

In order to ascertain that the selective dispersion effect of PAAX was truly due to the modified polymer itself and not to the associated poly-sulfides in the crude reaction, the flocculation testing was repeated with the purified PAAX solution. By using 300 mg/l of the purified PAAX solution, about 96 percent of the coal suspension flocculated in 5 minutes, while the pyrite suspension remained stable. These tests confirmed that the selective dispersion action was due to the PAAX (polyxanthate polymer) itself. 

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