Application of nonionic polyacrylamide in coal washing and dressing industry - CHINAFLOC
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Application of nonionic polyacrylamide in coal washing and dressing industry
2015-02-07 08:34:20
There is extensive application in coal dressing, anionic polyacrylamide is most commonly used, it can promote the effective solids quick subsidence, destruction of double charge structure of slime water stability, so that the suspension of slime particle coagulation, to clarify the recycling of coal slurry.
In the application of polyacrylamide type selection, coal washery coal slime settling, also has many applications to non ion polyacrylamide or cationic polyacrylamide, can according to different geological causes of slime.
Because of complex components of each mineral slime, take charge and surface adsorption capacity of different, wash the peat water difficult to deal with, often on the front need to add coagulant, the most common is the polymerization aluminum chloride, polymeric ferric sulfate etc.
In order to efficiently processing of coal waste water according to the need of optimization, coal slurry, coal slurry concentration and hardness of the grain size and other conditions. Selection of suitable flocculant products, in the polyacrylamide solution used to be noticed in the process of polyacrylamide solution in the peat water fully dispersed, hand cannot stir speed too fast, so as to avoid floc was damaged; on the other hand, attention should be paid to polyacrylamide solution and slurry mixing uniformity, so that the coal slurry surface contact polyacrylamide solution more fully, the charge matching degree is better, is conducive to the flocculation separation.
Separation of coal and iron, in addition to outside, manganese, copper, gold, zinc and so on, these mine wastewater general acidic state, generally by using neutralization method for treating this kind of wastewater, adjusting the pH value, the most commonly used limestone and lime to do adjustment agent.
For example, in the iron ore wastewater is treated by neutralization after processing, the main component of wastewater sludge ferric hydroxide Fe (oH) 3 and Ca (OH) 2 colloid, calcium hydroxide and colloid, Fe (OH) 2 ferrous hydroxide particles, and other ion. Use of cationic polyacrylamide (CPAM) treatment of iron sludge dewatering, can achieve very good results.