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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.
Power spinning is also called thinning spinning. Power spinning is a non-cutting processing method developed on the basis of ordinary spinning. When spinning, use the tail top to fix the blank on the mold. When the mold rotates, the rotating wheel makes a feeding motion, so that the blank continuously becomes thinner point by point and abuts against the mold to form a part of the required shape. Power spinning realizes the forming of the workpiece by changing the thickness and shape of the blank.
On airplanes, various nose covers, auxiliary fuel tanks, air intakes, gas cylinders, tie rods, slide rails, and actuators are all formed by spinning. In the engine, most of the propeller cap, casing, lip, intake cone, nozzle, nozzle, etc. are also formed by spinning. Such parts have complex structures, special raw materials, and large product sizes. The use of spinning forming can improve the integrity of structural components, reduce welds and component deformation, and reduce the workload of manual calibration. More importantly, due to the increased strength of the material after spinning, the design wall thickness of the parts can be reduced, thereby reducing the weight of the whole machine and improving the reliability of the whole machine.
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