The neutralization method has the characteristics of simple system, reliable and low cost. Depending on the neutralizing agent selected, it is usually divided into lime, lime milk, neutralization method, limestone neutralization method and limestone-lime combination method.
The limestone neutralization method uses limestone or dolomite as a neutralizing agent. The equipment and processes used are:
Ordinary filtration of neutralization method, limestone or white boulder dry powder or floating direct dosing, limestone neutral and roller method and upflow limestone expansion filter method.
When the content of divalent iron ions in the acid mine wastewater is high, the limestone-lime combination treatment method should be adopted.
This method is to add a lime reaction tank after the limestone neutralization treatment. The treatment process is as follows:
Acid mine drainage -> limestone neutralization drum -> lime reaction tank -> sedimentation discharge.
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