Effect of water hardness on coal flotation
Abstract：Laboratory experiments and industrial scale tests were designed to study the effect of water hardness on coal flotation in recycling water and tap water. The gypsum and potassium sulphate were used as modifying agents to adjust the water quality. The results show that the water hardness is a key factor that influences the dispersion stability between coal and clay par- ticles. The ash content of flotation clean coal was increased by 1 ~--2 ~ with the increasing of water hardness, and there is no obvious change for the yield of flotation clean coal. At the wa- ter hardness below 35 ~DH, the coagulation between coal and clay particles and the ash content of flotation clean coal generally increase with the increasing of water hardness. Further increas- ing the water hardness doesfft further enhance the coagulation between clay and coal particles, and the ash content of flotation clean coal.
Keywords：flotationwater hardnesscoagulationmodifying agent
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)