The content and type of montmorillonite are the criteria for determining whether a bentonite mineral product is acceptable. Therefore, the process technology of bentonite is particularly important. The bentonite beneficiation process is purified by dry and wet methods.
1. Dry method: the content of montmorillonite is over 80%
The dry method mainly adopts wind selection, and more than 90% of the bentonite concentrates in the world are obtained by wind selection. The wind selection generally requires that the amount of montmorillonite contained in the feed be more than 80%.
2, wet method: montmorillonite content <80%
In order to make full use of the medium and low grade bentonite resources with montmorillonite content <80%, high purity montmorillonite concentrate can be obtained by wet beneficiation process. The selection of a suitable dispersant can achieve the purpose of sodium modification while sorting and purifying montmorillonite. The wet process is mainly based on re-election, and is superfinely ground by a grinding machine such as a stirring mill, classified by a cyclone or a centrifuge, and magnetically removed to remove magnetic minerals. The wet process consumes a large amount of water and is difficult to dehydrate and dry.
The deep processing technology of bentonite includes artificial sodium modification, acid activation treatment, organic coating treatment, etc., in order to improve certain technical indicators of the product and increase its use value.
The artificial sodium modification methods include suspension method, stacking sodium method, extrusion method (wheel milling method, double screw extrusion method, choke extrusion method, counter roll extrusion method, etc.).
The acid-activated dry-drying activation process and the wet activation process.
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