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- Sludge dewatering process of polyacrylamide
Cationic polyacrylamide can fully meet the waste liquid treatment, the sludge concentration dehydration, mineral processing, coal washing, paper making, etc.
Flocculant is roughly divided into inorganic flocculant and high polymer flocculant two kinds big. Inorganic flocculant is mainly by reducing the surface potential way to play the role of reunion particles, such as price is cheap, but the dosage is bigger, the inefficiency of flocculation. High polymer flocculant with long chain structure, commonly on the chain functional groups containing a higher proportion of adsorption ability strong, can adsorption in different particle surface, the resulting bridging effect, the big floccules formation. Flocculant polymerization degree is higher, the aggregation effect more significant.
High polymer flocculant and the particles interact between process is divided into three steps: (1) of dispersing agent and the particles interact (defined as mixing action); (2) the rest of cohesion function; (3) further flocculation. Selection of anionic polyacrylamide (APAM) for tailing flocculant flocculation sedimentation treatment effect is best, and the flocculation sedimentation velocity impact from big to small in the order: pulp density > flocculating agent consumption > flocculant concentrations.
Flocculation precipitation technology has been widely used in all kinds of present mine tailings concentration in the production of settlement. Using flocculant "bridging" principle, in the role of cohesion, tailings particles collide with each other and in the long chain of flocculant structure under the action of adsorption together, gathered into larger flocculation groups, so as to speed up the tailings settling velocity. Flocculation is the essence of precipitation in the mixing process of coagulation, flocculation body and reaches a certain size and density, thus is advantageous to the precipitation, achieve the goal of QingZhuo separation. Grain diameter is proportional to the velocity, so the fine grained tailings in deep cone settlement flocculating agent must be added to obtain a larger size of flocculation, speed up the settlement of tailings.
The cationic polyacrylamide can be used as the slurry precipitation agent in the coal washing process. The coal washing waste water contains a certain amount of the hydrocarbon material; the unorganized emissions will pollute the soil and the groundwater. The coal washing slurry comes from the treatment of the sewage in the production, to deal with this sludge; the cationic polyacrylamide is strongly required in the treatment.
The influence of the sludge dehydration effect mainly depends on the roles of the flocculant.
The flocculant agent, on one hand, can make the sludge particle bridge and flocculate, which makes the sludge easy to be dehydrated, on the other hand, it also makes the sludge increase the viscosity which makes the mud cake more elastic, that will hinder the further dewatering effect to the sludge cake.
For the dosage of the polyacrylamide in the treatment of the coal slurry, it must be appropriate in order to effectively play its role in the flocculation effect. The appropriate dosage amount could be determined by the experiments based on the chosen process of the slime water treatment and the coal slurry property.
The less amount of the dosage will result in the slower speed of the coal slime sedimentation process, the concentrate overflow is easily exceed the standard, and can not ensure the required water circulation index, so that, the quality of the coal washing products is difficult to be stably controlled.