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- The main applications of polyacrylamide(PAM,FLOCCULANT)
The solution of many technological problems related to the acceleration and increase of efficacy of separation processes of solid-liquid systems requires the use of polyacrylamides, among others, two fundamental properties: high molecular weight and ionic (anionic or cationic ) in their molecules.
These separation processes acquire great importance in such currently essential as water purification (as flocculating agents in physical-chemical treatments for dehydration and drying of the resulting sludge), paper manufacture (as retention) activities or mining (as aids in the process of separating solids).
For the special features, you can only use a small number of commercially available monomers basis elements manufacture. Of all these, acrylamide has become the last thirty years in the major monomer onto which has been based the whole chemistry of these products. Over 95% of those in the market for the above uses polyacrylamides are synthesized from acrylamide and two or three more cationic or anionic comonomers.
Anionic polyacrylamide can be used in enrichment of ore mining and metallurgy, can effectively promote the sedimentation rate of the solid material using polyacrylamide or accelerate the enrichment of small objects, thus enhancing the effect of the solid-liquid separation, reducing queue erosion and environmental pollution applications, reduce production costs.
Mineral processing process in the general case, a high molecular weight product to ensure it is necessary that the rate of settlement, the effect of easy spinning process to better achieve the economic effects.
A coal industry, coal mined in accordance with the categories of different particle sizes, depending on the proportion of the carbon particles and the impurities in the aqueous medium in the separation of water, coal floating on top, impurities sink to the bottom, the coal classification processing, thereby obtaining the product.
In the above method for producing the powdered coal, coal processing may require further treatment for recycling. Usually completed by the flotation process, the addition of flocculant and coagulant aids to improve the efficiency of coal and separation of impurities out clean coal flotation, the waste disposal. Clean coal flotation sedimentation, filtration or centrifugation Lost Clean anionic polyacrylamide this process. As flocculant, for solid-liquid separation, filtration and centrifugation and then concentrated machine, again using the anionic polyacrylamide flocculant.
Two, crushed ore ingots sieved using a milling machine, water was added and sprayed more lime, concentrator Settlement Then, using anionic polyacrylamide this stage, promote the rapid resolution of solids substrate was filtered through a series of filter tank. Anionic polyacrylamide flocculant added before filtration concentrator.
Third lead and zinc in the process of separating zinc sulfide: oxidation mineral zinc oxide calcine. Then oxide leaching with sulfuric acid. PH in the neutral filtrate and filtrate pH of about 5 to 2.5 to enable acid all dissolved in concentrated sulfuric acid. Some hubs augment a hot filtration, the enrichment process to further improve recovery. Reverse reflux sedimentation systems are typically used overflow concentrated purified neutral.
Filtration in the process of lead and zinc, the use of anionic polyacrylamide. Flocculant to promote rapid resolution of minerals and clarification filtering, to improve the efficiency of the production process, to reduce the loss of minerals.
De aluminum crusher bauxite ore processing pulverized first to a level less than 1 mm. He added concentrated sodium hydroxide and the high temperature and pressure. The aluminum is dissolved in a highly corrosive fluid, while the other impurities besides silicon does not dissolve soluble. Gravel, together with a precipitate of the primary concentrated suspension together after the above process is removed. Entry into the main pool concentrated anionic polyacrylamide flocculant. This process overflow rinsed very important period. The bottom stream concentrated pool the red mud by a reverse reflux sinking process. Aluminum in this process in the liquid is recovered through a series of sedimentation pool washed. The anionic polyacrylamide flocculant is used again in order to promote rapid subsidence and qualify to clarify overflow. The aluminum-rich, the main pool overflow concentrated after filtration, cooling (48 hours), the filling of aluminum hydrate in order to promote the precipitated aluminum trihydrate. After filtration and washing the calcined aluminum.