Production technology for autoclaved aerated concrete building block

The invention discloses a production technology for an autoclaved aerated concrete building block. The production technology is characterized in that the material formula comprises, by weight, 65% of fly ash, 15% of cement, 14% of lime, 5.5% of phosphogypsum and 0.5% of aluminum powder. The production technology comprises the following steps: firstly, slurries are prepared, namely, fly ash is ground by utilization of a ball grinding mill to prepare a fly ash slurry, phosphogypsum is added with water, then stirring is carried out for 1h, a phosphogypsum slurry is prepared, and then lime is crushed and ground to lime powder by utilization of the ball grinding mill; secondly, blending and stirring are carried out, namely, all the materials are sent to a casting mixer, the casting mixer is started, stirring is carried out and a concrete slurry is obtained; thirdly, casting and die entering are carried out, namely, all the concrete slurry in the casting mixer is placed in a die, and casting is carried out; fourthly, namely, a green body is thickened and condensed gradually; fifthly, cutting is carried out, namely, the shaped green body is cut according to a designed size; sixthly, autoclaved curing is carried out, namely, the cut green body is sent to an autoclaved curing kettle for autoclaved curing, and a finished product aerated concrete building block is obtained.