CN1188834A

CN1188834A - Method for preparing sintered porous brick and hollow brick using flyash

Info

Publication number: CN1188834A
Application number: CN98100704A
Authority: CN
Inventors: 贾云峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-06
Filing date: 1998-03-06
Publication date: 1998-07-29
Anticipated expiration: 2018-03-06
Also published as: CN1068921C

Abstract

The load-bearing porous brick or hollow brick is made up of powdered coal ash (52-75%) and granular clay (25-48%) through treating raw materials, mixing, stirring several times, shaping, drying, sinter and cooling, and features high strength (10.0-30.0 MPa), high thermal and sound insulating effect and low cost. Said porous brick can be used to build-up (7-8)-storey buildings and said hollow brick can be used to build curtain wall.

Description

A kind of method with fly-ash Preparation Fired perforated bricks and hollow brick

The invention belongs to the method for comprehensive utilization of flyash, more specifically say so with the sintered porous and hollow brick of fly-ash Preparation.

China's electric power is mainly based on the coal-burning power plant, the annual flyash that will discharge several ten million tons, serious environment pollution, therefore how to fully utilize these flyash, more and more cause people's attention, and existing a large amount of data report, be that the primary raw material produced sintering brick just has a lot of open source informations wherein with flyash, as patent application CN1049148A propose by flyash, coal stone, expansive soil, borax be raw material by moulding, airing, fire by common brick again and form; It is raw material that CN1145339A announces with flyash, yellow sand and lime, form through mixing, cutting adobe, drying, sintering, the CN1066437A patent application proposes with flyash, clay and lightweight aggregate (wood chip, rice bar, husk) with 3-5: 5-7: the 0-2 volumetric mixture ratio adopts and holds the production technology of leading to brick and make solid light-weight brick; Above-mentioned three kinds all is sintering solid bricks.The CN1133271A patent application proposes to make unburned solid brick and hollow brick with flyash, ordinary Portland cement, sand and RH-1000 additive in addition.It is raw material that CN1160692A adopts flyash and the 20-50% borax of 50-80%, through moulding, drying, sinter solid brick or hollow brick into.

Though above-mentioned clinker brick respectively has its advantage, the raw material variety that has is many, the cement that will add 9-10% (as CN1133271A) that has, and the flyash addition that has fewer (as CN1066437A), so product cost is than higher.The patent that has is as the 89109385.0 patents fly ash brick of free of calcining and steam curing openly also, and it is to be raw material with flyash, cinder, lime, clay and water, through extrusion forming, maintenance in the air, but therefore the burning-free flyash brick intensity difference that this method makes, cost are difficult to promote the use of also than higher.

It is Fired perforated bricks and the hollow brick that major ingredient is made with flyash that purpose of the present invention proposes a kind of.

Technical scheme of the present invention: with flyash is major ingredient, doses an amount of clay and makes needed baking load-bearing porous brick and non-load bearing tile by comprising stirring, base, drying, calcination steps.

Raw material that clinker brick of the present invention is used and percent by volume thereof: flyash is 52-75%, clay 28-45%, and concrete preparation method may further comprise the steps:

1, the processing of raw material: raw material mixes in proportion, stirs, and static ageing is more than 70 hours;

2, compound processing: the compound that will go on foot ageing stirs the back and rolls the index of plasticity of the compound after rolling 〉=8.0 with edge runner;

3, base: the mixture after will rolling stirs again, squeezes the mud bar through vacuum, cuts into adobe then, extrudes the pressure 〉=18kg/cm of mud bar ², vacuum 〉=0.08Mpa;

4, drying: brick bat drying to water content less than 1%;

5, roasting: adopt the alternating temperature operation: normal temperature to 700 ℃ intensification 18-22 hour, 700 ℃ to 1200 ℃ intensification 4-6 hour, kept 10-15 hour for 1200 ℃;

6, cooling: cooling is forced in cooling or air blast naturally.

Also can sneak into the coal dust of the 4-6% of material quantity in the raw material of step (1), obtain hollow internal burned brick or porous internal burned brick.

Described flyash is the flyash of steam power station discharging, and it contains materials such as silica, di-iron trioxide, alumina, calcium oxide, and also containing nearly 20% particle diameter is the glass marble of 1-5 micron.These materials will change after high-temperature roasting, and glass marble is melted, and arrange to form net structure, are fixed with the reduction net structure of temperature, thereby make clinker brick have very high intensity.Divalent iron oxide after the roasting in the raw material becomes 3 valency iron oxide, and the color of brick is reddened by ash.Lime-ash hardness in the flyash is little, can meet instructions for use after edge runner rolls, if there is the lime-ash that is frozen into piece need pass through broken.

Described clay mainly is meant the clay that general common brick is used.

Described adobe, be with compound through the vacuum extrusion, cut into porous adobe or hollow brick blank, also can make the standard adobe, their used raw materials, technology are identical.Porous after roasting (internal combustion) brick hole ratio 20-40%, the non-bearing hole heart (internal combustion) brick hole ratio is 45-50%, and the size of porous brick can be 240 * 115 * 53 (or 90) mm, and the size of hollow brick can be 240 * 115 * 175 (or 240) mm.

Described roasting can be adopted known annular kiln or tunnel cave method for baking bricks.

Used edge runner, the mixer of the present invention all is the plant equipment of using always.

Major advantage of the present invention and effect:

Clinker brick of the present invention is because the amount of the flyash of usefulness is bigger, account for more than 52%, corresponding clay content reduces, the cost of product is than common brick and contain low many of the lower clinker brick of flyash amount, the preferential policy of " three wastes " of national regulation comprehensive utilization in addition, therefore method of the present invention has remarkable economic efficiency; Power plant emission goes out a large amount of flyash, and both contaminated environment had taken a large amount of soils again, can reduce environment pollution after the utilization, saves the farmland, therefore has social benefit significantly; Preparation process of the present invention adopts and repeatedly stirs and steps such as drying, roasting, thereby increased the plasticity of compound, improve the intensity of finished bricks, it is 10.0～30.0Mpa, freeze thawing dry mass loss＜20% that the present invention makes clinker brick compressive strength, coefficient of thermal conductivity 0.4-0.6 card/rice, the time, degree, can be used for the extremely frigid zones construction work, the porous bearing bricks can be used for 7-8 layer brick-concrete building and builds by laying bricks or stones, nonweight-bearing hollow brick can be used for the retaining wall of frame construction builds by laying bricks or stones, and the insulation of these two kinds of bricks, heat insulation, sound insulation property is all relatively good.

Further set forth characteristics of the present invention with example below:

Example 1

With 7.5m ³The flyash and the 2.5m of power plant discharging ³Clay mixes stirring, static ageing 70 hours is stirred, is rolled with edge runner, stirs again, vacuum is squeezed the mud bar, cut into the porous adobe of 240 * 115 * 53mm, be dried to water content less than 1% at 95 ± 5 ℃, in tunnel cave, from normal temperature to 700 ℃ intensification 20 hours, 700 ℃ of burnings to 1200 ℃ heated up 5 hours, 1200 ℃ of constant temperature 10 hours, last air blast cooling.The porous brick that makes is intensity 28.0MPa, coefficient of thermal conductivity 0.6 card/Mi Shidu after tested.

Example 2

With 5.5M ³Flyash and 4.5M ³Clay mixes stirring, static ageing 75 hours, (the time of stirring?), roll, stir again (time), squeeze the mud bar, make the hollow brick blank of 240 * 115 * 170mm, be dried to water content less than 1% at 95 ± 5 ℃, in tunnel cave, heated up 18 hours from normal temperature to 700 ℃, 700 ℃ of burnings to 1200 ℃ heated up 6 hours, 1200 ℃ of constant temperature 12 hours, last air blast cooling.The intensity 15MPa of the hollow brick that makes, 0.54 kilocalorie/Mi Shidu of coefficient of thermal conductivity.

Claims

1, a kind of method with fly-ash Preparation baking load-bearing porous brick and hollow brick is characterized in that with 52-75% (body) flyash and 28-45% (body) clay being that the method that raw material is produced clinker brick may further comprise the steps:

(1). the processing of raw material: raw material mixes in proportion, stirs, and static ageing is more than 70 hours;

(2). compound processing: the compound of (1) step ageing rolls the index of plasticity of the compound after rolling 〉=8.0 with edge runner after stirring;

(3). base: the mixture after rolling, squeeze the mud bar through vacuum, cut into adobe hollow or porous, extrude the pressure 〉=18kg/cm of mud bar ², vacuum 〉=0.08Mpa;

(4). drying: brick bat drying to water content less than 1%;

(5). roasting: adopt the alternating temperature operation: normal temperature to 700 ℃ intensification 18-22 hour, 700 ℃ to 1200 ℃ intensification 4-6 hour; At 1200 ℃ of following constant temperature 10-15 hours;

(6). cooling: cooling or air blast cooling promptly obtains bearing perforated brick or non-load bearing tile naturally.

2, in accordance with the method for claim 1, it is characterized in that also can sneaking in the raw material of step (1) coal dust of the 4-6% of material quantity, make hollow internal burned brick or porous internal burned brick.

3, in accordance with the method for claim 1, it is characterized in that described flyash is the flyash that discharge the steam power station.

4, in accordance with the method for claim 1, it is characterized in that described roasting can be with annular kiln or tunnel cave roasting.

5, in accordance with the method for claim 1, it is characterized in that described roasting tunnel cave roasting.

6, in accordance with the method for claim 1, it is characterized in that the bearing perforated brick hole ratio that is fired into is 20-40%, the non-load bearing tile hole ratio is 45-50%.