CN100506734C

CN100506734C - Method for removing brucite powder chromophore impurity

Info

Publication number: CN100506734C
Application number: CNB2006100480625A
Authority: CN
Inventors: 宁桂玲; 李鑫; 庞洪昌; 丰世凤; 林�源
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2006-10-16
Filing date: 2006-10-16
Publication date: 2009-07-01
Anticipated expiration: 2026-10-16
Also published as: CN1970486A

Abstract

The invention discloses an eliminating method of colorful group impurity in the brucite powder in the modifying technical domain of inorganic powder material surface, which is characterized by the following: using brucite to replace synthetic method to obtain magnesium hydroxide; saving cost to increase competitive dominance; improving the whiteness of brucite through nanometer cladded modified method; avoiding discharging waste in the whole course.

Description

A kind of method of eliminating brucite powder chromophore impurity

Technical field

The invention belongs to inorganic powder material process for modifying surface field, specially refer to look group impurity in a kind of elimination brucite powder, improve the method for whiteness.

Background technology

So-called look is rolled into a ball impurity, and the matrix material color that obtains after being meant brucite powder and organic polymer mixing is gloomy, influences material color and luster and outward appearance.

Brucite be a kind of nature exist contain the highest mineral of magnesium, main component is a magnesium hydroxide.And magnesium hydroxide is important inorganic anti-flaming material, constitutes more than 50% of all fire retardant consumptions with aluminium hydroxide, and the trend of increase year by year occurs.Magnesium hydroxide with brucite replaces synthesis method to obtain shows outstanding competitive edge on price, arrive sixth because the brucite powder cost just synthesizes 1/5th of magnesium hydroxide cost.This shows that development and use brucite resource will be brought vast market space and economic benefit.But,, thereby limited its Application Areas and product category because the impurity such as existence, particularly ferric oxide of all kinds of impurity have a strong impact on the brucite powder whiteness in the brucite.Purification process about brucite normally carries out it molten, filtration that neutralizes of acid at present, obtains purified magnesium hydroxide or magnesium oxide product through the precipitator method then.The influence of a kind of impurity such as method elimination iron of nanometer coating modification to the brucite powder whiteness adopted in contrast therewith, the present invention.This surface-treated cost accounts for 3%-10% in brucite powder processing total cost.

Summary of the invention

The technology technical problem that the present invention solves provides a kind of process for treating surface cheaply, can eliminate look group impurity effect in the brucite powder by this technology, increases powder whiteness, thereby meets the need of market.

Technical solution of the present invention is, is raw material with purity greater than 90% brucite mineral, it is obtained granularity less than the rough powder of 3mm with crusher in crushing and pulverizing, put it into then to pour in the ball mill behind the immersion certain hour in the aqueous solution that contains grinding aid and grind; After treating that the brucite particle size reaches requirement, add mineral colloid (or its precursor) or organic modifiers and continue to grind for some time; The powder product that filter then, drying just obtains needs; Filtrate cycle in the process is used.

Effect of the present invention and benefit are: whole process of preparation does not have waste discharge, belongs to the environment friendly technology; Powder super-refinement and surface treatment are carried out in same equipment, and coat elimination look group impurity effect by simple surface, make the brucite complete processing simple, are significantly reduced to this than traditional purification technique.

Embodiment

Be described in detail the specific embodiment of the present invention and step below in conjunction with technical scheme.

The method that removes the group of look in brucite powder impurity of the present invention is characterized in that the surperficial coating kind of using in the grinding aid that uses in the brucite super-fine processing process and the brucite superfine powder surface modification process is as follows:

The grinding aid that uses in the brucite extra-fine grinding process is at C ₆Choose in following amine, hydramine, acid amides, alcohol, the tri-polyphosphate (phosphoric acid salt that comprises K, Na, Mg), can contain two or three component simultaneously; Brucite superfine powder surface coating is at alumine hydroxide colloid or commodity aluminium-alcohol salt, colloidal tio 2 or commodity titanic acid ester, silicon oxide colloid commodity silicon ester, C ₁₆Following alkylamine, C ₈Choose in following phosphoric acid ester or the boric acid ester, can contain two or three component simultaneously; The technical process of technology of preparing is as follows:

Step 1: is raw material with purity greater than 90% brucite mineral, and it with crusher in crushing and pulverize and obtain granularity less than the rough powder of 3mm, is put it into then in the aqueous solution that contains grinding aid and soak, and soak time is 0.5 ~ 24 hour; Wherein the weight content of grinding aid in water is 0.05 ~ 3%; The solid-to-liquid ratio of the rough powder of brucite and the aqueous solution is 1:0.5 ~ 1:20;

Step 2: the solid-liquid mixture that soaks in the step 1 poured in the ball mill grind, milling time requires to select in 2 ~ 20 hours according to particle size; Wherein all parts that contact with powder can not be metal materials in the ball mill;

Step 3: join in the ball mill after step 2 is ground surperficial coating with wherein mixing of materials and continue to grind 0.5 ~ 1 hour,, again material is carried out solid-liquid separation then with mill ball and feed separation; Liquid phase recycles, solid-phase material obtains the brucite superfine powder of nanometer coating modification after drying, this powder is used for the macromolecular material fire retardant or can make during as the artificial marble filler matrix material produce lead look group, is equal to chemical pure SILVER REAGENT magnesium hydrate powder effect; The surperficial coating consumption that uses in this step accounts for 0.1 ~ 5% of powder weight; Mineral colloid in the coating is bought from commodity according to practical situation or oneself is synthetic, and synthetic method 4 is carried out set by step;

Step 4: the synthetic method sol-gel method of mineral colloid, the lot of documents report is arranged, with aluminium hydroxide is example: the aqueous isopropanol that will contain aluminum isopropylate 20% is under agitation slowly poured in the aqueous isopropanol of moisture 40 ~ 70%, acetic acid 3 ~ 5%, just obtains aluminum hydroxide sol; When with commodity aluminium-alcohol salt or ester, it is 10 ~ 30% organic solution that alkoxide (or ester) is made into weight concentration, directly join then in the ball milling mechanical irrigation, as: the aqueous isopropanol that directly will contain aluminum isopropylate 20% under agitation joins in the ball milling mechanical irrigation.

Embodiment 1

The rough powder of water intaking magnesite 10 ~ 50 grams add that 30 ~ 50 grams contain that trolamine weight is 0.2 ~ 15%, in the aqueous solution of ethanol 0 ~ 20%; Breeze soaks after 1 ~ 4 hour whole slip poured in the ball milling mechanical irrigation in solution and grinds; Grind and add aqueous isopropanol 1 ~ 10 gram, the C that contains aluminum isopropylate 20% after 1 ~ 3 hour again ₈Following boric acid ester 0 ~ 3 gram; Continue then to grind 0.5 ~ 2 hour; After material separates with mill ball, material liquid-solidly separates, the solid-phase material drying just obtains the modification brucite powder, use it for and can not produce any lead or other look group in the organic resin material.

Claims

1. method of eliminating brucite powder chromophore impurity, it is characterized in that: the surperficial coating kind of using in grinding aid that uses in the brucite super-fine processing process and the brucite superfine powder surface modification process is as follows:

Choose in amine, hydramine, acid amides, alcohol or the tri-polyphosphate of the grinding aid that uses in the brucite extra-fine grinding process below C6, get wherein one or more; Tri-polyphosphate comprises the phosphoric acid salt of K, Na or Mg;

Brucite superfine powder surface coating is chosen in alumine hydroxide colloid, colloidal tio 2, silicon oxide colloid commodity silicon ester, the following alkylamine of C16, the following phosphoric acid ester of C8 or boric acid ester, gets wherein one or more;

The technical process of technology of preparing comprises:

Step 1: surpassing 90% brucite mineral with purity is raw material, and it with crusher in crushing and pulverize and obtain rough powder below the granularity 3mm, is put it into then in the aqueous solution that contains grinding aid and soak, and soak time is 0.5～24 hour; Wherein the weight content of grinding aid in water is 0.05～3%; The solid-liquid weight content of the rough powder of brucite and the aqueous solution is 1:0.5～1:20;

Step 2: the solid-liquid mixture that soaks in the step 1 poured in the ball mill grind, milling time requires to select in 2～20 hours according to particle size; Wherein all parts that contact with powder can not be metal materials in the ball mill;

Step 3: join in the ball mill after step 2 is ground surperficial coating with wherein mixing of materials and continue to grind 0.5～1 hour,, again material is carried out solid-liquid separation then with mill ball and feed separation; Liquid phase recycles, solid-phase material obtains the brucite superfine powder of nanometer coating modification after drying, this powder is used for the macromolecular material fire retardant or can make during as the artificial marble filler matrix material produce lead look group, is equal to chemical pure SILVER REAGENT magnesium hydrate powder effect; The surperficial coating consumption that uses in this step accounts for 0.1～5% of powder weight; Mineral colloid in the coating is bought from commodity according to practical situation or sol-gel method is synthesized.

2. a kind of method of eliminating brucite powder chromophore impurity according to claim 1, its feature also is: the synthetic method sol-gel method of mineral colloid: the aqueous isopropanol that will contain aluminum isopropylate 20% under agitation slowly pour into moisture 40～70% and the aqueous isopropanol of acetic acid 3～5% in, just obtain aluminum hydroxide sol.