CN1121902A - Clay-free flyash sintered brick and making method thereof - Google Patents

Abstract

The sintered clay-free flyash brick is made up from flyash (80-97%) and calc bentonite (3-20%) through curing their mixture, shaping by semi-drying method, drying and sintering in kiln and features beautiful appearance, 12.23MPa average strength, 23% hygroscopicity, volume weight of (1.38-1.63) 10 to the power -3 kg/cu.cm, and good insulating property.

Description

Clay-free flyash sintered brick and method for making thereof

The present invention is a kind of technology of utilizing heat power plant's flyash to make clay-free flyash sintered brick for building.Relate to waste reside comprehensive utilization and materials for wall technical field.

There is a large amount of fuel-burning power plant in China, the tens million of tons of year ash discharge amount, and the discharging of flyash has become big public hazards, in order to solve environmental pollution, promotes total utilization of PCA, carries out the research of high blending flyash brick, is a China and even a global big problem.Have a lot of people to be engaged in this important function for of research at present both at home and abroad, at present comparatively sophisticated can be as have two kinds of correlation technique of the present invention, i.e. steam-cured brick of flyash and clay coal ash sintering brick; Mix the high advantage of ash amount though steamed brick has, its product is freeze-thaw-not, and is not durable, and heat-insulating property is also bad, and many these class producers stop production or change the line of production.Clay coal ash sintering brick fly ash amount is only up to 30%-40%, and the blending complex process, and production efficiency is low, and the product heat-insulating property is also bad.

Task of the present invention is at the problems referred to above, develop a kind of clay ingredient that do not use, height is mixed the clay-free flyash sintered brick of ash amount, and make its performance meet or exceed the common brick level, and its cost is not higher than clay brick, can solve long-standing utilization of fly ash problem, again can not need ruin the field manufacturing clay brick that fetches earth, and solve the urgent need of building wall material.

Of the present invention theing contents are as follows: 1. starting material

[1] flyash requires:

Composition: AL ₂O ₃≤ 30% SiO ₂〉=40% SO ₃≤ 10%

Grain warp≤∮ 5mm

Water ratio≤15% (the water content height can dry use)

[2] calcium bentonite requires:

If flyash contains AL ₂O ₃Amount is high, then requires the AL of calcium bentonite ₂O ₃Low, so that the AL of compound ₂O ₃Be no more than 30%.

Particle diameter≤∮ 0.1mm

Water ratio≤5%2. proportion scales:

Flyash 80%-97%

Calcium bentonite 3%-20%3. processing step is as follows in order:

By formula rate requirement batching, mix, slaking is pressed into the brick bat drying adobe, goes into klining and becomes finished product.4. processing parameter:

Curing process is in order to allow admixtion and moisture content homogenizing, increases admixtion plasticity, requires compound piled up to leave standstill more than 24 hours.

With semidrying compression moulding, before moulding, require the compound water content below 12%.

Brick bat drying can seasoning, also can be in the tunnel furnace drying, and brick bat drying is below 8% to water-content.

The highest sintering temperature is 1000 ℃-1100 ℃, and firing period is 36 hours, and sintering temperature curve and clay brick are roughly the same.5. performance:

With the clay-free flyash sintered brick that above-mentioned prescription and processing condition are made, every physical and mechanical property all reaches clay brick one-level brick standard, and heat-insulating property and freezing and thawing performance all are better than clay brick, and its cost is near clay brick.

Embodiment:

Flyash 80%, calcium bentonite 20%, metering mixes respectively, it is even to add a certain amount of water remix, accumulation is got up, and slaking is more than 24 hours, and remix once, dry moisture content below 12%, with 6 casement compression mouldings, adobe seasoning or make the adobe moisture content below 8% in the tunnel furnace drying is placed on sintering in the tunnel furnace of common brick factory then on pressing machine, 1000 ℃ of sintering top temperatures, 36 hours sintering periods, burn the brick that, corner angle are neat, good looking appearance, average water-intake rate 23%, average intensity 12.3MPa, unit weight reach (1.38-1.63) * 10 ^-3kg/ cm ³, good heat insulating, complete freeze-thaw-, every index all meets or exceeds the standard of one-level.

Advantage of the present invention and effect:

1. this product quality can reach one-level brick standard for building, draws materials conveniently the worker Skill is simple, and the production efficiency height all can be produced throughout the year, is not subjected to weather effect, Solved power plant's ash discharge in winter difficult problem.

2. it is the highest to mix the ash amount, does not use clay, can avoid the flyash contaminated environment, And can protect the land resource of country.

3. because materials for wall is a large amount of building materials that consume, the present invention combines for flyash Close to utilize and open up Kai Xinlu; Take Anshan steam power plant as example, annual discharging flyash 1 20,000 tons, utilize the technology of the present invention, build one and produce 6000 ten thousand blocks of standard bricks per year Brick field can all be eaten up the flyash that power plant emission goes out.

Claims (4)

1. a clay-free flyash sintered brick is characterized in that, composition is by flyash 80%-97%, and calcium bentonite 3%-20% forms.

2. clay-free flyash sintered brick according to claim 1 is characterized in that the requirement of described flyash composition:

Contain AL ₂O ₃≤ 30% contains SIO ₂〉=40% contains SO ₃≤ 10% particle diameter≤∮ 5mm.

3. clay-free flyash sintered brick according to claim 1 is characterized in that the AL in the described calcium bentonite ₂O ₃Composition requires itself and flyash to be made into AL behind the compound ₂O ₃≤ 30% its warp≤∮ 0.1mm.

4. the method for making of a clay-free flyash sintered brick is characterized in that its processing step is as follows in order:

By formula rate requirement batching, batch mixing, slaking, be pressed into base, dry brick, go into klining and become finished product;

Slaking conditional request compound is piled up more than 24 hours; Use semidrying compression moulding, require mixture moisture content below 12% before the compacting; 1000 ℃ of sintering top temperatures--1100 ℃, 36 hours sintering periods.