for coal washing,we normally use anionic polyacrylamide with medium molecular weight and medium hydrolysis degree.sometime we can use nonionic polyacrylamide ,it depend on the geological conditions
we recommend our models of Chinafloc A2015 for your applications.
1. Product characteristics
After the coal is mined and sized it is then ground down by ball mills and then separated from the waste by gravityin a medium of water. The coal floats and the waste sinks with the subsequent coal again sized and separatedinto the finished product.
During the process fine coal particles are generated which require further processing to recover these fine coalparticles. This is normally achieved by a flotation process where a flotation agent is added to promote theseparation of coal from waste. Again the coal floats and the waste sinks.
The fine coal is then recovered by sedimentation and then by filtration or centrifugation. Flocculants are used in the sedimentation process to promote solid-liquid separation and subsequent rapid settlement in the thickeners so by producing clean water from the overflow of the thickeners for recycling back to the preparationplant. The fine coal, which settles, is subsequently recovered by filtration/centrifugation as the finegrade coal product. Again during the filtration/centrifugation process flocculant is added to enhance theseparation process.
When processing brown coal, or coal with high clay content, it is sometimes necessary to use a coagulant prior to the addition of a flocculant for settlement applications so as to achieve efficient solids capture and anacceptable overflow clarity.
2. Quality index
(1)Settlement/clarification of fine coal slurry in the thickening vessels.
(2)Enhancing solid-liquid separation of the fine coal (from the thickener underflow) normally by filtration /centrifugation.
(3)Settlement/clarification of the waste slurry (tailings) in the thickening vessels.
(4)Enhancing solid-liquid separation of the tailings (from the thickener underflow) normally by filtration/centrifugation.
4. Instruction for use
(1)It's very important to make the efficient dispersion during using, otherwise will cause agglomerate
and"fish eyes", dissolving time will be longer.