CN106179186A

CN106179186A - A kind of preparation technology of active attapulgite clay

Info

Publication number: CN106179186A
Application number: CN201510220129.8A
Authority: CN
Inventors: 蒋华
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-05-04
Filing date: 2015-05-04
Publication date: 2016-12-07

Abstract

A kind of active clay for oil and fat purification, it includes that attapulgite original soil adds appropriate dilute acid solution, mixes wet soil, through extruding, roasting, is broken into product.The advantage of this technique is by acid amount pettiness, with short production cycle, low cost, energy consumption dry production little, without exhaust waste.Product has neutral nontoxic, Heat stability is good；Can substantially reduce acid value of lipids in oil and fat refining, drive away oils and fats abnormal flavour, keep in refine rice oil the effective ingredient such as oryzanol；Carcinogen flavacin in absorption oils and fats there is is special effect, is oils and fats and the excellent decolorising agent of chemical products and adsorbent.

Description

A kind of preparation technology of active attapulgite clay

Technical field

The present invention is the preparation technology of active attapulgite clay.

Background technology

Active hargil outside Present Domestic, extreme portions is with bentonite as raw material, is the Emathlite of the wet production activated with the strong acid such as sulphuric acid, hydrochloric acid.Often produce a bentonite active hargil product, typically want 300～400 kilograms of concentrated sulphuric acids, 70～80 water.Causing production cycle length, cost height, energy consumption big, the most substantial amounts of waste water seriously pollutes environment.Again because using the product that above-mentioned raw materials and technique produce, containing residual acid about 0.2%, pH value 2～3, when thus be accordingly used in the decolouring of edible oil, the most also some residual acids are brought in edible oil, when making food with this edible oil, because of high containing residual acid, after child is edible, easily occur that the intestines and stomach is unsuitable, is harmful to health.Introduce in application one literary composition according to attapulgite character: " attapulgite adds water and amasss more than 40% for the soil body, in 7.309 kilograms per centimeter²During pressure, decolorizing ability increases suddenly, and exceeding this pressure decolorizing ability increases slowly;400 DEG C of temperatures above roastings, display decolorizing ability activity increases ".But so far there are no the commodity product of the neutron activation attapulgite clay of without exhaust waste dry production in the high production of decolorizing ability on actual international market.

Summary of the invention

The invention aims to study one acid, water consumption pettiness, the preparation technology of without exhaust waste dry production active attapulgite clay.Product is made to have neutral nontoxic pH value 7～8, heat stability height, high adsorption capacity, acid value of lipids, deodorization can be reduced simultaneously and remove carcinogen-flavacin, keep the feature such as refine sugar and oil oryzanol, become oils and fats and the excellent decolorising agent of chemical products and adsorbent.

The preparation technology of the present invention: first be select attapulgite original soil be raw material, by its coarse crushing, ted;Broken entrance agitator in warp, is simultaneously introduced the diluted acid (aqueous solution) that concentration is 0.3～0.01 equivalent again, is stirred uniformly, and making the wet soil water content after mixing thoroughly is 35～60%;Again through pressure be 15～80 kilograms per centimeter², optimum pressure is 30～45 kilograms per centimeter²Extrude, dry;Being 200～400 DEG C of roastings through temperature again, roasting time is 30 minutes to 2 hours;The most again through in small, broken bits, check, be packaged into product.

The distinguishing feature of the present invention be attapulgite be a layer chain aluminium magensium silicate, in octahedron, magnesium etc. are unstable ions, soil adds appropriate dilute acid solution (being optimal with aqueous hydrochloric acid solution) extrude again, roasting, magnesium, iron ion is made to be dissolved in attapulgite surface, make original considerable magnesium iron ion position in attapulgite octahedron form " hole ", thus considerably increase the decolouring of attapulgite clay, absorption property.Again because active attapulgite clay need not add the acid of volume in preparation process, it is again that preparation, so its not blowdown, has therefore reached the intended purpose of invention under conditions of dry method.

Embodiment:

1. local canescence attapulgite original soil, is broken to through jaw crusher straight through less than 2 centimetres, makes original soil moisture less than 15% after tedding;It is broken to 60～80 mesh in grinding with little steel again, enter back in stirring container, (now original soil water content is generally less than 10%) is simultaneously introduced the aqueous hydrochloric acid solution of the cation exchanged water preparation that appropriate concentration is 0.05～0.02 equivalent in a reservoir, and the agitated wet soil water content made after mixing thoroughly is 56%;Extrude under the pressure of 15 kilograms every square centimeter with spiral mud extrusion machine again;Then dry into flame-insulating type rotary kiln, after kiln temperature arrives 360 DEG C, control this temperature calcination 1.5 hours;After taking-up in small, broken bits with φ 300 type centrifugal mill, make 95% above by 200 mesh, wherein should be not more than 45% less than 400 purposes, moisture is not more than 5%.Above product reaches 190 to decolorized rate power.(attapulgite original soil is 90 to decolorized rate power)

According to China's required standard at present, decolorizing ability more than 170 is efficient level active soil.

2. local Dark grey attapulgite original soil, through jaw crusher to the diameter less than 2 centimetres, makes original soil moisture less than 15% after tedding;60～80 mesh it are broken to again in φ 300 centrifugal mill, after enter to stir in container, (now water content is generally less than 10%) is simultaneously introduced the appropriate aqueous hydrochloric acid solution that concentration is 0.036 equivalent prepared with cation exchanged water, and stirring and evenly mixing, making the wet soil water content after mixing thoroughly is 39%;Reenter in extruding tank, with hydraulic press in 30 kilograms per centimeter²Pressure under extrude 3 seconds, reversely multiple pressure is once;Enter after drying in flame-insulating type rotary kiln, after kiln temperature arrives 200 DEG C, bakee 30 minutes;Taking-up φ 300 type centrifugal mill is in small, broken bits, makes 95% above by 200 mesh, is wherein not more than 45% less than 400 purposes, moisture is not more than 5% as far as possible.Above product reaches more than 190 to decolorized rate power.(this attapulgite original soil is 90 to decolorized rate power).

Claims

1. the preparation technology of an active attapulgite clay, it includes extruding, roasting, crushes, the invention is characterized in that adding dilute acid solution in attapulgite original soil is prepared as wet soil, the acid concentration of dilute acid solution is 0.3～0.01 equivalent, and optium concentration is 0.05～0.02 equivalent.

Preparation technology the most according to claim 1, is characterized in that the water quality preparing dilute acid solution can be cation exchanged water, distilled water or natural soft water.

Preparation technology the most according to claim 1, is characterized in that the pressure limit of extruding is 15～80 kilograms per centimeter², optimal pressure range is 30～45 kilograms per centimeter²。

Preparation technology the most according to claim 1, is characterized in that sintering temperature is 200～400 DEG C.

Preparation technology the most according to claim 1, is characterized in that the time of roasting is 30 minutes～2 hours.