Fine sodium modification method and device for bentonite

Abstract

The invention discloses a fine sodium modification method and device for bentonite. The fine sodium modification method comprises the following steps: airing a raw material, removing impurities from the raw material, crushing, blending and stirring, and extruding through fine sodium modification. The fine sodium modification device comprises a hammer crusher, a spiral stirrer, a fine sodium modification extruder and a belt conveyer. After aired and cleaned, the raw ore of the bentonite is crushed by the hammer crusher, the crushed material is added with a sodium modifying agent in a vibration way in the conveying process through the belt conveyer, enters the spiral stirrer, is added with water to be blended and stirred, and is then conveyed to the fine sodium modification extruder to be extruded to obtain a modified semi-finished product, and then the modified semi-finished product is dried and grinded to obtain a finished product of the fine sodium modification bentonite. The bentonite particles are completely degraded in water with the adoption of the method and the device provided by the invention, the bentonite suffers from high-strength extrusion force and shearing force in the modification process, the degree of modification is high, and the column-shaped semi-finished product is low in water content, so that follow-up drying is facilitated.

Description

technical field [0001] The invention relates to a bentonite deep-processing technology, in particular to a bentonite refined sodium modification method and a device thereof. Background technique [0002] In the process of artificial sodium modification of calcium-based bentonite, the exchangeable cation species between montmorillonite layers is mainly changed through the principle of ion exchange, so as to achieve the purpose of changing the physical and chemical properties of bentonite. The crystal structure of montmorillonite is composed of two layers of silicon-oxygen tetrahedron sandwiching a layer of aluminum (magnesium) oxygen (oxygen hydroxide) octahedral layer, which is a 2:1 type layered clay mineral. Al in the tetrahedral layer 3+ Can replace Si 4+ , Mg in the octahedral layer 2+ Can replace Al 3+ , This kind of isomorphic replacement causes montmorillonite to generate excess negative charge, which can adsorb exchangeable cations on the surface of the crystal l...

AI Technical Summary

Problems solved by technology

Both the dry method and the semi-dry method of sodium treatment have the phenomenon of "cooking", that is, during the modification process, the blocky calcium-based bentonite is difficult to crush, and it is still blocky when the modification is completed, and its interior is not in contact with the sodium agent. , is still a calcium-based soil, so the overall modification effect is not good. In order to pursue a better sodium treatment effect, it generally needs to be squeezed twice or more times, which increases equipment investment and production costs; the wet method sodium treatment has a good modification effect , but the investment is high and the cost is high, generally only used for experimental research, rarely used for actual production

[0004] CN2709445Y discloses a kind of special equipment in the process of sodium bentonite, the equipment is provided with stirring tank and extruding chamber, is the combination of screw mixer and screw extruder in essence, this equipment has good remodeling effect, but still There is a "cooked" phenomenon, and in the actual production process, this equipment has high requirements for material moisture control

If the moisture is too high, the extrusion force will be small and the modification effect will be poor; if the moisture is too low, the material will be difficult to extrude, which will easily damage the equipment; It is difficult to ensure that the bentonite is evenly hydrated during the process

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