Process characteristics and considerations of batching in aerated concrete production line
October 20, 2021
When the aerated concrete production line is working, the general environment is at room temperature, the application of mixing equipment to promote the reaction between raw materials and water, releasing gas expansion slurry, while hardening cement and lime, so that the finished product of aerated concrete equipment to present a porous structure, the second stage occurs under high temperature conditions, CaO and gas reaction in the aerated concrete equipment, greatly increasing the final product of The strength of the final product is greatly increased to ensure the high quality and standard of the final aerated concrete.
Features of the batching process in aerated concrete production line
There are three kinds of raw materials for batching from physical form: liquid materials, slurry materials and powder materials, in addition to aluminum powder or aluminum powder paste.
1 liquid material measurement
Liquid materials are often measured in volume measurement tanks. Its structure is a certain volume of the cylinder (the lower part of the cone), in and out of the material tube is equipped with solenoid valve, the simplified version is connected to the liquid level indicator controller.
2 slurry material measurement
Slurry materials using slurry metering tank metering, volume metering and weight metering type two. Volume metering type slurry metering tank with glass liquid level meter observation surface for control. Its structure is relatively simple, the measurement accuracy is not high, not convenient for automatic control; weight type slurry metering tank generally with sensors for the measurement of components, measurement accuracy is high, convenient for automatic control, but the structure is more complex.
3 powder material measurement
Powdered materials are measured by weight measurement, the use of more is the lever type powder metering scale and electronic sensing type powder metering scale two. Lever weighing scale structure is relatively simple, but the measurement accuracy is not high, the material in and out of the material is not intuitive, easy to cause misoperation, and most can only measure a material, so that the batching system layout complicated; electronic sensor type weighing scale measurement accuracy is high, can achieve automatic recording and full program control, and can be multi-material measurement. Metering in and out of material instructions clear, not to form misoperation, but the equipment maintenance requirements are high.
4 Aluminum powder metering
Aluminum powder and aluminum powder paste dosage is relatively small, the general use of manual measurement, but poor sanitary conditions, foreign use of aluminum powder first formulated into aluminum powder suspension, and then the aluminum powder suspension according to the amount of ingredients for measurement, generally applicable to larger enterprises; domestic small and medium-sized enterprises also use aluminum powder paste concentrated in a silo, through the feeder into the measurement scale, measurement and then sent to the aluminum powder mixer for mixing, but because of the aluminum powder The amount of aluminum powder used is small, the impact on the gas, measurement of a slight error, it is easy to cause quality accidents, so most domestic factories are still using manual measurement to ensure the accuracy of measurement.
5 Mixing of materials
Mixing of materials and slurry pouring by the mixer to complete, the mixer must make a variety of materials in a short time to mix uniformly, and can be heated to adjust the temperature. In a shorter time (within 1min) the aluminum powder suspension, etc. will be quickly dispersed into the slurry, and finally pouring.
So what do you need to consider when batching aerated concrete?
First, to give full play to the dual role of chemical properties of raw materials and admixtures, and use the best combination of the two effectiveness, in order to reduce the water-cement ratio and cement and water consumption, should choose suitable customers to put into operation aerated concrete equipment admixtures and admixtures, and to ensure the matching of the two.
Second, consider the best amount of raw materials, must be derived from the trial ratio. To strictly prevent the ratio of insufficient amount and to avoid the side effects of excess admixture auxiliary raw materials, try to minimize the water-cement ratio to improve the pore structure of aerated concrete equipment products, thereby increasing the denseness, which is a key factor in improving the durability of finished products, strength, etc.. It is particularly worth reminding the point that the choice of high-efficiency compound admixture, and to test the best amount of admixture; different role of aerated concrete products to be designed according to its use of specific planning raw material ratios.
Third, the use of small water requirements to replace the high rate of raw material admixtures. Try to reduce the cement and water consumption, because the cement dosage is high or the volume of cementitious material slurry is too large, then will bring certain losses.