CN101941848B

CN101941848B - Autoclaved sawn mud concrete building block and processing technique thereof

Info

Publication number: CN101941848B
Application number: CN2010102480787A
Authority: CN
Inventors: 翟玉波; 张朝林; 刘昭; 翟雷
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-04
Filing date: 2010-08-04
Publication date: 2012-07-04
Anticipated expiration: 2030-08-04
Also published as: CN101941848A

Abstract

The invention discloses an autoclaved sawn mud concrete building block and a processing technique thereof, belongs to a building material and a production and processing process thereof, and particularly relates to an engineering building block taking sawn mud generated in a stone sawing and processing process as a manufacturing raw material and a processing technique thereof. The building block is characterized by comprising the following raw materials in percentage by weight: 70 to 82 percent of sawn mud, 14 to 22 percent of lime, 3 to 14 percent of cement, 0.8 to 1.8 percent of gypsum and 0.06 to 0.12 percent of aluminum powder, wherein the water cement ratio is 0.5 to 0.68/1. The technique manufactures the high-quality material used in the building industry by fully using a large amount of waste, namely the sawn mud generated in the stone processing industry; and the technique has considerable economic benefit, reduces the pollution emission of the stone processing industry to the environment to a great extent, and meanwhile has good social benefit.

Description

Steam-pressing saw mud concrete building block and processing technology thereof

Technical Field

The invention belongs to a building material and a production and processing technology thereof, and particularly relates to an engineering building block taking saw mud generated in the process of sawing and processing stone as a raw material and a processing technology thereof.

Background

At present, in civil engineering, the most applied wall building blocks are fly ash aerated concrete blocks and quartz sand aerated concrete blocks, and the main manufacturing raw materials are fly ash and quartz sand. Wherein,

the fly ash aerated concrete block comprises the following raw materials in proportion:

70 to 80 percent of fly ash, 15 to 22 percent of lime and 3 to 7 percent of cement

0.8 to 1.8 percent of gypsum, 0.06 to 0.12 percent of aluminum powder and 0.5 to 0.65/1 percent of water-cement ratio

The quartz sand aerated concrete block comprises the following raw materials in percentage by weight:

68-76 percent of quartz sand, 13-21 percent of lime and 8-14 percent of cement

0.8 to 1.6 percent of gypsum, 0.06 to 0.12 percent of aluminum powder and 0.5 to 0.68/1 percent of water-cement ratio

Therefore, in the existing wall building block, the usage amount of the fly ash and the quartz sand is very large. The price of the two materials is high, and the price tends to rise continuously with the continuous increase of the dosage and the implementation of the resource regulation policy. On the other hand, saw mud is the main waste in the stone processing industry, the generation amount is very large, and no way for recycling is available at present. It is common practice to vent the air and water locally, thus causing serious pollution to the local air and water source environment.

Disclosure of Invention

The invention aims to provide a novel autoclaved sawn mud concrete block and a processing technology thereof, so as to achieve the purposes of utilizing waste, changing waste into valuable, reducing environmental pollution and saving utilization resources.

The invention discloses an autoclaved saw mud concrete block which is characterized by comprising the following raw materials in parts by weight:

70 to 82 percent of saw mud, 14 to 22 percent of lime and 3 to 14 percent of cement

0.8 to 1.8 percent of gypsum, 0.06 to 0.12 percent of aluminum powder and 0.5 to 0.68/1 percent of water-cement ratio.

The invention discloses a processing technology of autoclaved saw mud concrete building blocks, which is characterized by comprising the following steps:

the method comprises the following steps: collecting saw mud generated in the sawing process of the stone, dehydrating the saw mud by adopting a natural drying or drying method, crushing the saw mud by using a ball mill, grinding the saw mud, and sieving the crushed saw mud by using a sieve of 400-600 meshes to obtain saw mud fine powder for later use;

step two: according to the raw material proportion, putting the ground saw mud fine powder and gypsum into a stirring tank, adding water for stirring, and uniformly stirring to form slurry for later use;

step three: pumping the slurry into a pouring tank, sequentially adding lime and cement, stirring for 3-4 minutes, measuring the diffusivity of the slurry, wherein the diffusivity requirement reaches 16-20, and adjusting the diffusivity by adding water externally;

step four: after the diffusivity meets the requirement, starting a heating rod in a pouring tank, adding aluminum powder into an aluminum powder stirrer, adding water to prepare an aluminum powder suspension, adding the aluminum powder suspension into the pouring tank after the temperature of the slurry reaches 40-45 ℃, stirring for 50-60 seconds, and pouring the slurry into a mold;

step five: placing the die in a curing room for primary curing, wherein the room temperature of the curing room is 30-40 ℃, and the curing time is 3-3.5 hours;

step six: pushing out the blank after the strength of the blank reaches 0.7-0.9 MPa, demolding, and cutting according to a specified size;

step seven: turning the cut blank body, then hanging the turned blank body on a trolley, and then pushing the trolley into the still kettle;

step eight: vacuumizing the autoclave for 20 minutes, introducing saturated steam when the pressure in the autoclave is zero, keeping the pressure in the autoclave to be 1.28Mpa for about 2.5 hours, then performing constant-pressure curing for 6 hours, exhausting after curing is finished, opening a door of the autoclave when the pressure reaches standard atmospheric pressure, pushing out the building blocks, and stacking.

The autoclaved saw mud concrete block and the processing technology thereof provided by the invention make full use of a large amount of waste-saw mud generated in the stone processing industry, and further prepare high-quality materials used in the building industry, thereby not only having considerable economic benefits, but also reducing the pollution emission of the stone processing industry to the environment to a great extent, and having good social benefits at the same time.

Detailed Description

1. And (5) sawing the mud into a warehouse. 1000 kg of water-containing stone powder, namely saw mud generated in the process of sawing the stone is added into a feeding port by a loader, the stone powder is conveyed into a stirring pool by a conveyor belt after being ground by a ball mill, 20 kg of gypsum is added, 720 kg of water is added for full stirring, and the mixture is made into slurry for standby.

2. Pumping the slurry into a casting tank, adding 100 kg of cement and 200 kg of lime, stirring, adjusting the diffusivity, starting a heating rod in the casting tank when the diffusivity reaches about 18, adding 20 kg of aluminum powder suspension with the concentration of 5% after the temperature of the slurry reaches 45 ℃, and casting into a mold.

3. The mold was pushed into a curing chamber and cured at a room temperature of about 40 ℃ for 3 hours.

4. And pushing the mold out of a curing room, demolding, conveying to a cutting table, cutting into required small blocks, lifting to a turnover table, planing off unqualified products after turnover, and then lifting to a steam curing trolley by using a grab.

5. The steam curing trolley is pushed onto a ferry vehicle, and the ferry vehicle is utilized to push the air adding block into the still kettle.

6. Vacuumizing the autoclave, introducing air for about 2.5 hours, and curing at constant pressure for 6 hours after the pressure reaches 1.28 Mpa. And exhausting the air for 1 hour after the curing is finished.

7. And after the exhaust is finished, pushing the steam curing trolley out of the still kettle, stacking the air adding blocks, conveying the air adding blocks to a stock area, curing at room temperature, and delivering the air adding blocks out of the factory after the air adding blocks are detected to be qualified.

Through detection, the technical indexes of the autoclaved saw mud concrete building block disclosed by the invention reach that:

compressive strength: 3.8MPa (average value)

Monoblock minimum: 2.9Mpa

Dry bulk density: 612kg/m³

Thermal conductivity (dry state): 0.15W/(m.K)

Radionuclide limit: i is_Ra 0.08

Ir 0.15 。

Claims

1. The autoclaved saw mud concrete block is characterized by comprising the following raw materials in parts by weight:

2. The method for processing the autoclaved sawn mud concrete block according to claim 1, which is characterized by comprising the following steps:

step eight: vacuumizing the autoclave, introducing saturated steam when the pressure in the autoclave is zero, maintaining at constant pressure for 6 hours after the pressure in the autoclave reaches 1.28Mpa, exhausting, opening a door of the autoclave after the pressure reaches standard atmospheric pressure, pushing out the building blocks, and stacking.