CN101367250A - Bentonite purification method - Google Patents

Abstract

The invention discloses a method for purifying bentonite. The method comprises the following steps: 1. dry raw bentonite is screened by use of a vibrating screen, so as to remove dust blown into the raw bentonite during storage and transport, and the humidity of a raw material is between 12 and 18 percent; 2. water is added for pulping, and the liquid-solid ratio of slurry is between 6 and 8 to 3; 3. at least two-grade sedimentation sand removal is carried out; a tapered bottom valve of a taper sedimentation tank is regularly opened for clearing impurities; and suspending liquid is injected into a slurry storage tank from a tank wall pipeline by use of a pump; 4. separation is carried out by use of a horizontal helical centrifuge, so as to remove solid matter and reserve thick slurry; 5. the slurry is dried by use of a steam heat exchange device; and 6. grinding is carried out till more than 98 percent of materials pass through a 200-mesh screen, and then a finished product is obtained. The method can be applied to purify bentonite so as to produce high-quality medicinal bentonite.

Description

A kind of bentonite purification method

Technical field

The present invention relates to a kind of bentonite purification method, relate to a kind of employing physical method bentonitic method of purifying specifically.

Background technology

Bentonite (Bentonite) is pressed transliteration, is the moisture clay pit based on montmorillonite, and public school's molecular formula is: Nax (H2O) 4 (AI2-xMg0.83) Si4010) (OH) 2, because it has special nature.As: swelling, caking property, adsorptivity, catalytic, thixotropy, suspension and cation exchange or the like, can do binding agent, suspending agent, thixotropic agent, stabilizing agent, purification and decoloration agent, casting resin, feed, catalyst etc., be widely used in fields such as agricultural, light industry and cosmetics, medicine, so montmorillonite is a kind of broad-spectrum natural minerals.High-purity is bentonitic has many uses, but natural bentonite all contains impurity such as christobalite, quartz, feldspar, mica, has only these impurity is removed, and could bring into play its usefulness to greatest extent.

Traditional bentonite purification method is: the bentonite after levigate mixes with water, and making beating adds chemical agent (calgon or sodium pyrophosphate etc.) flocculation, polymerization, and precipitation, centrifugation, solid product, oven dry, levigate, the mother liquor reuse.The shortcoming of this method is owing to used chemical reagent, no matter is in the product or in the waste water of discharging the residual of chemicals to be arranged all.Emission causes environmental pollution on the one hand; Factor application owing to product quality is restricted on the other hand.

Summary of the invention

The objective of the invention is: a kind of bentonite purification method is provided, adopts pure physical method to purify.

Technical scheme of the present invention is: a kind of bentonite purification method, form by the following step:

1, dry original soil sieves: remove the dust that original soil blows in storage and transportation, adopt concussion to sieve raw material humidity 12--18%;

2, add water making beating, mud liquid-solid ratio 6--8:3;

3, two-stage precipitation desanding at least; The taper sedimentation basin is regularly opened awl bottom valve cleaning impurity, and suspension is squeezed into pulp storage tank with pump by the pool wall pipeline.

4, horizontal spiral centrifuge separates, and discards solids, keeps dense mud;

5, mud is dried with steam heat exchanger;

6, levigate; 200 orders pass through more than 98%, get product.

Advantage of the present invention is: owing to adopted pure physical method, adopt the steam drying about 100 ℃ again, both reached the effect of kill bacteria, do not destroy bentonitic any structure again, do not influence its intrinsic performance.Therefore product quality is improved, and has improved product price simultaneously, particularly can directly use at pharmaceutical field.

The specific embodiment

Embodiment 1, dry original soil screening: remove the dust that original soil blows in storage and transportation, adopt the concussion sieve, raw material humidity 12%; Add the water making beating, mud liquid-solid ratio 6:3; The desanding of three grades of precipitations, horizontal spiral centrifuge separates, and discards solids, keeps dense mud; Mud is dried with pipe bundle type dryer after press filtration; Levigate, use Raymond machine, 200 orders pass through more than 98%, get product.

Embodiment 2, dry original soil screening: remove the dust that original soil blows in storage and transportation, adopt the concussion sieve, raw material humidity 18%; Add the water making beating, mud liquid-solid ratio 8:3; The desanding of three grades of precipitations, horizontal spiral centrifuge separates, and discards solids, keeps dense mud; Mud indirect heat transfer drum dry; Levigate, use Raymond machine, 200 orders pass through more than 98%, get product.

Claims (1)

1. bentonite purification method is characterized in that being made up of the following step:

Dry original soil screening: remove the dust that original soil blows in storage and transportation, adopt the concussion sieve, raw material humidity 12--18%;

Making beating: add the water making beating, mud liquid-solid ratio 6--8:3;

Desanding: awl bottom valve cleaning impurity is regularly opened in two-stage precipitation desanding at least, taper sedimentation basin, and suspension is squeezed into pulp storage tank with pump by the pool wall pipeline;

Separate: horizontal spiral centrifuge separates, and discards solids, keeps dense mud;

Oven dry: mud is dried with steam heat exchanger;

Levigate: 200 orders pass through more than 98%, get product.