Production technology of special aluminum powder for aerated concrete

In the past, aluminum powder used as gas-generating agent for aerated concrete products in China was mainly produced by dry method, which was complicated in production process, large in investment, unsafe, heavy in pollution and high in cost. In recent years, several factories have developed water-based aluminum paste, but the requirements for water quality are harsh, and some processes must have more post-treatment procedures, which is costly. Now, after a lot of experiments, the process of producing water-based aluminum paste from ordinary tap water and well water has been successfully developed, which can save a lot of costs.

Production process: aluminum ingot-melting-granulation-screening-ball milling-dehydration-packaging-products.

manufacturing method

1. Quality control of raw materials

When using aluminum foil scraps as raw materials, we should first select foils, pick out oxide foils, and separate aluminum foils with different thicknesses to ensure the uniform thickness of raw materials. When aluminum ingots are used as raw materials, it is necessary to ensure no oxide and uniform particle size.

2. Ball milling and grinding

The aqueous solution of the screened aluminum foil or aluminum particles and various additives is put into a ball mill for grinding. When grinding, the temperature inside the machine should be strictly controlled. If the temperature is too high, it can be adjusted by cooling with water. Stop the machine after the fineness of the material meets the requirements. The grinding AIDS used can prevent the ball and powder from sticking to each other in the ball milling process, so that the ball milling can be carried out smoothly. Gouache can make aluminum powder evenly dispersed in aqueous solution, which is convenient for grinding. Corrosion inhibitor can prevent the chemical reaction between aluminum powder and water. Coating can prevent aluminum powder from contacting with air and reacting with water in the ball mill, that is, aluminum powder is coated. Detergent was washed off by oxide in ball milling, which improved the product quality.

Step 3 unload the goods

Immediately after the ball mill stops, add the prepared discharge liquid into the machine, start the machine for 3-5 minutes, dilute the materials in the machine, and then vacuum the materials into the temporary storage tank. Then rinse the residual materials in the machine with 30~50kg of clean water, and then vacuum the water into the temporary storage tank.

dehydrate

Put the suction filter into the suction filter tank, then open the discharge valve of the temporary storage tank and put the feed liquid in the tank into the suction filter tank. When the water tank is full, close the valve, pneumatic vacuum pump, open the dehydration valve and water storage tank valve, and suck the water into the water storage tank for recycling. After the solid part is qualified, the slurry on the suction filter is discharged and put into a bucket.

After users use the aluminum paste, the reaction quality is reliable, and the produced aerated concrete block has uniform pores, moderate pore size, appropriate thickness of inter-pore walls and compressive strength in line with national standards. Warmly welcome friends from all walks of life to visit, inspect and negotiate business and seek common development.