Method for purifying montmorillonite, purified montmorillonite and combination thereof
A technology of montmorillonite and montmorillonite powder, which is applied to chemical instruments and methods, wet separation, and other household appliances, and can solve problems such as high cost, difficult separation of fine-grained impurities, and long purification cycle
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Embodiment 1
[0259] The purification of embodiment 1 montmorillonite
[0260] Mineral composition of raw bentonite: montmorillonite 42.5%, α-quartz 33.9%, kaolin 12.0%, feldspar 7.4%, calcite 4.3%, see Figure 2.
[0261] The raw ore is dried, crushed, passed through a 50-mesh sieve, added water and 0.3% sodium hexametaphosphate of raw ore powder to form a slurry with a solid content of 20%, stirred for two hours, passed through a three-stage hydrocyclone, and separated The slurry is mixed with water to make a thin slurry with a solid content of 3%, which is separated in a disc centrifuge, and the separated thin slurry is concentrated in another disc centrifuge, and the concentrated slurry is passed through a plate and frame filter press After pressure filtration, a filter cake with a solid content of 40-50% is obtained. The filter cake is dried at 120° C. and crushed to a size above 500 mesh.
[0262] The mineral composition of the purified montmorillonite is 95.1% montmorillonite and 5.1...
Embodiment 2
[0263] The purification of embodiment 2 montmorillonite
[0264] Mineral composition of raw bentonite: montmorillonite 46.8%, α-quartz 53.2%, see Figure 4.
[0265] The raw ore is dried, crushed, passed through a 50-mesh sieve, added water and 0.5% sodium polyacrylate powder of the raw ore, and made into a slurry with a solid content of 15%, stirred for 2.5 hours, passed through a four-stage hydrocyclone, and separated Add water to the slurry to make a thin slurry with a solid content of 3%, enter the disc centrifuge for separation twice, and the separated thin slurry enters another disc centrifuge to concentrate, and the concentrated slurry is filtered by plate and frame After press filtration, a filter cake with a solid content of 40-50% is obtained. The filter cake is dried at 120°C and crushed to a size above 500 mesh.
[0266] The mineral composition of the purified montmorillonite: 96.7% montmorillonite, 3.3% α-quartz, see Figure 5. The recovery rate is 65%, heavy meta...
Embodiment 3
[0267] The purification of embodiment 3 montmorillonite
[0268] Mineral composition of raw bentonite: 86.5% montmorillonite, 13.5% α-quartz, see Figure 6.
[0269] The raw ore is dried, crushed, passed through a 50-mesh sieve, added water and 0.8% sodium hexametaphosphate of raw ore powder, and made into a slurry with a solid content of 25%. After stirring for two hours, pass through a three-stage hydrocyclone, The separated slurry is mixed with water to make a thin slurry with a solid content of 3%, and it is separated once in a disc centrifuge, and the separated thin slurry is concentrated in another disc centrifuge, and the concentrated slurry is pressed through a plate and frame. After pressing by the filter, a filter cake with a solid content of 40-50% is obtained, which is dried at 120°C and crushed to a size above 500 mesh.
[0270] Mineral composition of purified montmorillonite: 97.0% montmorillonite, 3.0% α-quartz, see Figure 7. The recovery rate is 75%, heavy met...
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