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Application of Polyacrylamide in Mining Industry

Polyacrylamide is widely used in mining, especially in mineral processing. Polyacrylamide can not only separate minerals and ore, but also can be used as a flocculant for wastewater treatment in the mining industry, or to seal mining pipelines.

1. After the gold and silver are crushed and screened, the minerals are further pulverized by adding water and lime with a grinder, and then settled in the next step of the thickener. At this stage, the polyacrylamide anion is used to promote the rapid settlement of the solid, and the substrate passes through a series of filter tanks. Perform filtering. Add anionic polyacrylamide flocculant to the thickener before filtration.

2. Lead and zinc in the separation process of zinc sulfide: minerals are oxidized to zinc oxide after calcining. Next, the oxide is leached with sulfuric acid. The neutral filtrate with a pH of about 5 and the acidic filtrate with a pH of 2.5 can dissolve all the concentrate in sulfuric acid. Some concentrators add a hot filtration and concentration process to further increase the recovery rate. The reverse reflux sedimentation system is usually used for the overflow purification of neutral concentration. In the lead-zinc filtration process, anionic polyacrylamide flocculant is used to promote the rapid sedimentation of minerals and the clarification of the filtrate, improve the production efficiency of the process, and reduce the loss of minerals.

3. In the process of aluminum ore processing, first crush the mineral to less than 1mm level. Then add concentrated sodium hydroxide and apply high temperature and high pressure. Aluminum is dissolved in highly corrosive liquids, and other impurities are not dissolved except for soluble silicon. After the above process, the sand and gravel are removed together with the ore slurry that has undergone primary concentration and precipitation. An anionic polyacrylamide flocculant is added to the primary concentration tank. This is a very important process for clarifying the overflow. The underflow of the thickening tank, the red mud, will be treated by a reverse flow sedimentation process. In this process, the aluminum in the liquid is recovered through a series of washing and settling tanks. At this time, the anionic polyacrylamide flocculant is used again to promote rapid sedimentation and obtain a clarified overflow that meets the requirements. The overflow of the aluminum-rich primary concentration tank is filtered, and after cooling (48 hours), aluminum hydrate is added to promote the precipitation of aluminum trihydrate. After filtering, washing and calcining to obtain aluminum.

4. The ore pulp or tailings from the flotation pond of copper ore will enter the thickening pond for further settlement. At this time, flocculants are added to promote rapid sedimentation and clarify overflow. The clarified overflow will be used as recycled water. The remaining concentrated tailings will be driven into a centrifuge for centrifugal dehydration, at which time anionic polyacrylamide flocculant will be added as a centrifugal additive.

The air bubbles (concentrate) laden with copper ore are separated mechanically from the overflow. Then it is concentrated and dehydrated. At this time, anionic polyacrylamide flocculant is used to improve the efficiency of sedimentation and filtration. The final concentrate or filter cake contains approximately 25% to 35% copper. This will be recovered through pyrometallurgy.


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