CN107746289B

CN107746289B - Preparation process of corrosion-resistant and freezing-resistant aerated brick

Info

Publication number: CN107746289B
Application number: CN201711096839.XA
Authority: CN
Inventors: 卢松; 徐淑伟; 杜鹏; 王文强; 张建国; 王斌; 郄子玥
Original assignee: Inner Mongolia Fufeng Biotechnologies Co ltd
Current assignee: INNER MONGOLIA FUFENG BIOTECHNOLOGIES Co.,Ltd.
Priority date: 2017-11-09
Filing date: 2017-11-09
Publication date: 2020-10-16
Anticipated expiration: 2037-11-09
Also published as: CN107746289A

Abstract

The invention belongs to the field of building materials, and discloses a preparation process of a corrosion-resistant and freezing-resistant aerated brick, which comprises the following steps: step 1) preparing a material A, step 2) preparing a material B, step 3) preparing a material C, step 4) preparing a material D, step 5) preparing a mixture, and step 6) preparing an aerated brick. The invention takes the waste slag as the main raw material and assists other raw materials, the preparation process is simple, and the prepared aerated brick has the advantages of corrosion resistance, freezing resistance, high strength and good heat insulation performance.

Description

Preparation process of corrosion-resistant and freezing-resistant aerated brick

Technical Field

The invention belongs to the field of building materials, and particularly relates to a preparation method of a cold-proof and frost-proof concrete aerated brick.

Background

The aerated brick is a novel light and porous building material, and has the advantages of light weight, good heat preservation, processability, no combustion and the like. The light porous silicate product is prepared by using siliceous material and calcareous material as main material, adding gas generating agent, and through compounding, stirring, pouring, pre-curing, cutting, steaming, curing and other technological processes. The aerated concrete is called aerated concrete because the aerated concrete contains a large amount of uniform and fine air holes. The building material can be made into building blocks, plates and heat-insulating products with different specifications, can be widely applied to bearing or enclosing filling structures of industrial and civil buildings, receives general attention of the construction industry of various countries in the world, and becomes a building material which is vigorously popularized and developed by a plurality of countries.

The aerated brick is also called as an aerated concrete block, has very wide application, and is mainly used for wall materials, filler walls, floor slabs, roof slabs and other load-bearing wall materials, non-load-bearing materials and surrounding filler enclosing walls in mechanical workshops and civil buildings. The aerated brick is an aerated brick building block produced by a high-temperature steaming and pressing equipment process, namely, a brick product produced by other various processes including steaming and pressing, the aerated brick is a novel wall building material, and the aerated brick is unique in that the aerated brick is a very light heat-insulating novel building wall material, and the technology of China starts later and is more than four decades behind the whole country, but the development of the aerated brick industry of China is really very rapid, and the technical process level of the domestic aerated brick can reach the international advanced level at present.

Along with the development of the building industry, the building is higher and higher, the requirements of people on the living quality are added, and the requirements on the strength, the corrosion resistance, the shrinkage value, the freezing resistance and the like of the aerated brick are improved. The aerated brick prepared by the traditional method has low strength and poor freezing resistance, the brick body is easy to damp and mildew, the aging resistance of the brick body is poor, and the service life of the brick body is greatly shortened.

Slag is a molten waste produced in the combustion chamber of a boiler from coal, and a large amount of slag is produced by amino acid production enterprises. Due to the low utilization value and the high transportation cost, most of the slag is piled up, which causes waste and environmental pollution. How to recycle the slag and improve the added value of enterprises is also a technical problem to be solved.

Disclosure of Invention

The invention aims to overcome the defect that the aerated brick in the prior art is poor in performances such as corrosion resistance, freezing resistance and the like, and provides a preparation process of a corrosion-resistant freezing-resistant aerated brick.

In order to achieve the above object, the technical solution of the present invention is achieved by:

a preparation process of a corrosion-resistant and freezing-resistant aerated brick comprises the following steps: step 1) preparing a material A, step 2) preparing a material B, step 3) preparing a material C, step 4) preparing a material D, step 5) preparing a mixture, and step 6) preparing an aerated brick.

Further, the air conditioner is provided with a fan,

the step 1) of preparing the material A comprises the following steps: and sequentially adding the slag, the quartz sand and the desulfurized gypsum into a stirring kettle according to the mass ratio of 10-20:3-5:2-3, fully stirring to uniformly mix, crushing, and sieving with a 50-mesh sieve to obtain a material A.

Further, the air conditioner is provided with a fan,

the step 2) for preparing the material B comprises the following steps: and (2) crushing the zeolite, calcining at 500 ℃ for 30min, naturally cooling to room temperature, adding the mixture into water with twice weight, and uniformly stirring to obtain a material B.

Further, the air conditioner is provided with a fan,

the step 3) is to prepare a material C: pulverizing wheat bran into powder, adding into 3-5M magnesium chloride aqueous solution with twice weight, stirring at 200rpm for 10min, standing for 30min, filtering, and collecting precipitate to obtain material C.

Further, the air conditioner is provided with a fan,

the step 4) for preparing the material D comprises the following steps: putting the silica sol, the sodium dodecyl sulfate and the glass fiber into a dispersion machine according to the mass ratio of 3:1:1, dispersing for 2min at 1000rpm, and then adjusting the pH value to 9 by using sodium hydroxide to obtain a material D.

Further, the air conditioner is provided with a fan,

the step 5) of preparing the mixture comprises the following steps: and (3) conveying the material A, the material B, the material C, the material D and the phosphate cement to a stirrer according to the mass ratio of 30-50:1-2:2-3:3-5:10-15, adding water accounting for 1.5-2 times of the mass of the phosphate cement, mixing and stirring at the stirring speed of 100rpm for 60min to obtain a mixture.

Further, the air conditioner is provided with a fan,

the step 6) of preparing the aerated brick comprises the following steps: pouring the mixture obtained in the step 5) into a mold, and performing compression molding by a press machine to obtain a brick blank, wherein the compression strength is 22MPa, and the compression time is 30 s; placing the prepared green brick into a static curing chamber, sealing the static curing chamber, keeping the temperature at 60 ℃, and keeping the static curing time for 3-5 hours; and cutting the statically-cured brick blank into blocks by a cutting machine, and finally putting the blocks into a steam curing kettle for steam curing treatment.

Preferably, the first and second electrodes are formed of a metal,

the temperature of the autoclaved curing treatment is 180 ℃, the pressure is 1.5MPa, and the time is 2 h.

The starting point and the beneficial effects of the invention mainly comprise but are not limited to the following aspects:

the waste slag is used as a main raw material and is used as an auxiliary raw material, the preparation process is simple, and the prepared aerated brick is corrosion-resistant, freezing-resistant, high in strength and good in heat-insulating property;

the wheat bran belongs to wastes, is used as a water reducing agent, has the requirements of freezing resistance, permeation resistance and the like, has strong hydrophilicity, expands after absorbing water, has poor adhesive force and slow condensation, and the magnesium chloride has the functions of corrosion prevention and mildew prevention on agricultural wastes, prevents the phenomenon of serious retardation in the preparation process and prolongs the service life of the product;

according to the invention, the zeolite material is calcined, and a proper amount of the zeolite material is added, so that the self-shrinkage of the mixed material in the drying process is reduced, and the breaking and compression strength of the aerated brick is improved;

according to the invention, silica sol and sodium dodecyl sulfate are used as foaming agents, so that the foaming uniformity, stability and compatibility are good; pores with different levels are generated by foaming of the two foaming agents and are matched with each other in a synergistic manner, so that the excellent heat-insulating and moisture-proof effects can be achieved, and meanwhile, the corrosion resistance and the breaking strength of the aerated brick can be improved by adding a proper amount of glass fibers.

Drawings

FIG. 1: influence of the addition amount of the slag on the performance of the aerated brick.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the present invention will be described more clearly and completely below with reference to specific embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A preparation process of a corrosion-resistant and freezing-resistant aerated brick comprises the following steps:

step 1) adding slag, quartz sand and desulfurized gypsum into a stirring kettle in sequence according to a mass ratio of 10:3:2, fully stirring to mix uniformly, crushing, and sieving with a 50-mesh sieve to obtain a material A;

step 2) crushing zeolite, calcining at 500 ℃ for 30min, naturally cooling to room temperature, adding the mixture into water with twice weight, and uniformly stirring to obtain a material B;

step 3) crushing wheat bran into powder, adding the powder into a magnesium chloride aqueous solution with the concentration of 3M and the weight twice that of the wheat bran, stirring the mixture for 10min at a stirring speed of 200rpm, standing the mixture for 30min, filtering and collecting precipitates to obtain a material C;

step 4) putting the silica sol, the sodium dodecyl sulfate and the glass fiber into a dispersion machine according to the mass ratio of 3:1:1, dispersing for 2min at 1000rpm, and then adjusting the pH value to 9 by using sodium hydroxide to obtain a material D; the concentration of the silica sol is 8 wt%;

step 5) conveying the material A, the material B, the material C, the material D and the phosphate cement to a stirrer according to a mass ratio of 30:1:2:3:10, adding water accounting for 1.5 times of the mass of the phosphate cement, mixing and stirring at a stirring speed of 100rpm for 60min to obtain a mixture;

step 6) pouring the mixture obtained in the step 5) into a mold, and performing compression molding through a press machine to obtain a brick blank, wherein the compression strength is 22MPa, and the compression time is 30 s; placing the prepared green bricks into a static curing room, sealing the static curing room, keeping the temperature at 60 ℃, and keeping the static curing time for 3 hours; cutting the statically-cured brick blank into blocks by a cutting machine, and finally putting the blocks into a steam curing kettle for steam curing treatment, wherein the steam curing treatment temperature is 180 ℃, the pressure is 1.5MPa, and the time is 2 h.

Example 2

step 1) adding slag, quartz sand and desulfurized gypsum into a stirring kettle in sequence according to a mass ratio of 20:5:3, fully stirring to mix uniformly, crushing, and sieving with a 50-mesh sieve to obtain a material A;

step 3) crushing the wheat bran into powder, then adding the powder into a magnesium chloride aqueous solution with the concentration of 5M and the weight twice that of the wheat bran, stirring the mixture for 10min at the stirring speed of 200rpm, then standing the mixture for 30min, filtering and collecting precipitates to obtain a material C;

step 4) putting the silica sol, the sodium dodecyl sulfate and the glass fiber into a dispersion machine according to the mass ratio of 3:1:1, dispersing for 2min at 1000rpm, and then adjusting the pH value to 9 by using sodium hydroxide to obtain a material D; the concentration of the silica sol is 10 wt%;

step 5) conveying the material A, the material B, the material C, the material D and the phosphate cement to a stirrer according to a mass ratio of 50:2:3:5:15, adding water accounting for 1.5-2 times of the mass of the phosphate cement, mixing and stirring at a stirring speed of 100rpm for 60min to obtain a mixture;

step 6) pouring the mixture obtained in the step 5) into a mold, and performing compression molding through a press machine to obtain a brick blank, wherein the compression strength is 22MPa, and the compression time is 30 s; placing the prepared green bricks into a static curing room, sealing the static curing room, keeping the temperature at 60 ℃, and keeping the static curing time for 5 hours; cutting the statically-cured brick blank into blocks by a cutting machine, and finally putting the blocks into a steam curing kettle for steam curing treatment, wherein the steam curing treatment temperature is 180 ℃, the pressure is 1.5MPa, and the time is 2 h.

Example 3

step 1) adding slag, quartz sand and desulfurized gypsum into a stirring kettle in sequence according to a mass ratio of 15:4:2, fully stirring to mix uniformly, crushing, and sieving with a 50-mesh sieve to obtain a material A;

step 3) crushing the wheat bran into powder, then adding the powder into a magnesium chloride aqueous solution with the concentration of 4M and the weight twice that of the wheat bran, stirring the mixture for 10min at the stirring speed of 200rpm, then standing the mixture for 30min, filtering and collecting precipitates to obtain a material C;

step 4) putting the silica sol, the sodium dodecyl sulfate and the glass fiber into a dispersion machine according to the mass ratio of 3:1:1, dispersing for 2min at 1000rpm, and then adjusting the pH value to 9 by using sodium hydroxide to obtain a material D; the concentration of the silica sol is 9 wt%;

step 5) conveying the material A, the material B, the material C, the material D and the phosphate cement to a stirrer according to the mass ratio of 40:1:2:5:10, adding water accounting for 2 times of the mass of the phosphate cement, mixing and stirring at the stirring speed of 100rpm for 60min to obtain a mixture;

step 6) pouring the mixture obtained in the step 5) into a mold, and performing compression molding through a press machine to obtain a brick blank, wherein the compression strength is 22MPa, and the compression time is 30 s; placing the prepared green bricks into a static curing room, sealing the static curing room, keeping the temperature at 60 ℃, and keeping the static curing time for 4 hours; cutting the statically-cured brick blank into blocks by a cutting machine, and finally putting the blocks into a steam curing kettle for steam curing treatment, wherein the steam curing treatment temperature is 180 ℃, the pressure is 1.5MPa, and the time is 2 h.

Example 4

The performance test of the aerated brick of the invention comprises the following steps:

TABLE 1

Performance index	Density kg/cubic meter	Compressive strength Mpa	Loss rate of compressive strength after freezing%	Flexural strength Mpa	Soaking in 6% saline for 100 days
						Example 1	653	93.4	10.2	17.2	Without loosening and flaking
Example 2	681	95.2	9.5	17.6	Without loosening and flaking
						Example 3	639	91.4	9.8	16.3	Without loosening and flaking

And (4) conclusion: the aerated brick prepared by the process has excellent frost resistance and corrosion resistance, high compressive and flexural strength, low density and thermal conductivity controlled within 0.15 w/m.k, prolongs the service life and improves the building quality.

Example 5

Influence of various material factors on the performance of the aerated brick:

1. the slag components selected by the invention are as follows: the slag composition was determined as follows: 47.3 percent of silicon dioxide, 25.9 percent of aluminum oxide, 5.4 percent of ferric oxide, 3.7 percent of calcium oxide, 1.3 percent of magnesium oxide and the balance of others, and the pH value is 8.9.

The influence of the addition amount of the material A on the performances of various aspects of the aerated brick is detected, the weight ratio of 30:1:2:3:10 recorded in the example 1 is used as an example, the comparative example 1 is set to be free of slag, and the rest is the same as the example 1; comparative example 2 was a mass ratio of 10:1:2:3:10, as in example 1; comparative example 3 was a mass ratio of 50:1:2:3:10, as in example 1; comparative example 4 was a mass ratio of 70:1:2:3:10, as in example 1.

As shown in FIG. 1, in comparative examples 3 to 4, the compressive and flexural strength was remarkably decreased by adding an excessive amount of slag; the compression strength and the breaking strength of the comparative examples 1-2 and the example 1 are not large, but the compression strength loss rate after freezing and the heat preservation performance of the example 1 are obviously better than those of the comparative examples 1-2 (not shown in the attached drawings), and the addition of a proper amount of slag can reduce the enterprise burden and improve the utilization value of waste.

2. Impact of material B on performance: the comparative example, in which the material B was not added, found that the compressive and flexural strength was reduced by 10% or more.

3. Impact of Material D on Performance: comparative example 1 only adopts sodium dodecyl sulfate and glass fiber, and comparative example 2 only adopts sodium dodecyl sulfate, and the result shows that the compressive strength of comparative example 1 is reduced by 15%, the glass fiber is slightly dropped after being soaked in 6% saline water for 100 days, and the heat conductivity coefficient is improved by 30%; the compressive strength of comparative example 2 was reduced by 20% or more, and the film was loosened and peeled off after being soaked in 6% saline for 100 days.

Although the specific embodiments of the present invention have been described with reference to the examples, the scope of the present invention is not limited thereto, and those skilled in the art will appreciate that various modifications and variations can be made without inventive effort by those skilled in the art based on the technical solution of the present invention.

Claims

1. A preparation process of a corrosion-resistant and freezing-resistant aerated brick comprises the following steps:

step 1) preparing a material A, comprising the following steps: sequentially adding the slag, the quartz sand and the desulfurized gypsum into a stirring kettle according to the mass ratio of 10-20:3-5:2-3, fully stirring to uniformly mix, crushing, and sieving with a 50-mesh sieve to obtain a material A;

step 2) preparing a material B, comprising the following steps: crushing zeolite, calcining at 500 ℃ for 30min, naturally cooling to room temperature, adding the mixture into water with twice weight, and uniformly stirring to obtain a material B;

step 3) preparing a material C: pulverizing wheat bran into powder, adding into 3-5M magnesium chloride aqueous solution with twice weight, stirring at 200rpm for 10min, standing for 30min, filtering, and collecting precipitate to obtain material C;

step 4) preparing a material D, comprising the following steps: putting silica sol, sodium dodecyl sulfate and glass fiber into a dispersion machine according to the mass ratio of 3:1:1, dispersing for 2min at 1000rpm, and then adjusting the pH value to 9 by using sodium hydroxide to obtain a material D;

step 5) preparing a mixture, comprising the following steps: conveying the material A, the material B, the material C, the material D and the phosphate cement to a stirrer according to the mass ratio of 30-50:1-2:2-3:3-5:10-15, adding water accounting for 1.5-2 times of the mass of the phosphate cement, mixing and stirring at the stirring speed of 100rpm for 60min to obtain a mixture;

step 6) preparing the aerated brick, which comprises the following steps: pouring the mixture obtained in the step 5) into a mold, and performing compression molding by a press machine to obtain a brick blank, wherein the compression strength is 22MPa, and the compression time is 30 s; placing the prepared green brick into a static curing chamber, sealing the static curing chamber, keeping the temperature at 60 ℃, and keeping the static curing time for 3-5 hours; and cutting the statically-cured brick blank into blocks by a cutting machine, and finally putting the blocks into a steam curing kettle for steam curing treatment.

2. The preparation process according to claim 1, wherein the autoclave curing treatment is carried out at a temperature of 180 ℃, a pressure of 1.5MPa and a time of 2 h.