Pulverised Fuel Ash or Flyash in AAC Plants

Pulverised fuel ash (PFA) is a waste product of pulverised fuel (typically coal) which is used as an energy source in power stations.

The fuel is pulverised into a fine powder and then mixed with heated air to be burned.

Approximately 18% of the fuel forms fine glass spheres, the lighter of which (± 75%) are borne aloft by the combustion process.

This lighter fraction is typically extracted from the flue gasses by cyclones and electrostatic precipitation.

Depending on the source (mining area) and the makeup of the fuel being burned (traditional or ultramodern methods), the components of the PFA vary considerably, but all PFA contain substantial amounts of silicon dioxide (SiO2), both amorphous and crystalline.

The quantity of silicon dioxide and the presence of other components in PFA determine whether a given PFA can be used in the production of autoclaved aerated concrete (AAC).

Requirements of Flyash for AAC Blocks Manufacturing:

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Recipe Calculation for AAC Blocks

Recipe is nothing but knowing the dry weight (batch weight) of one batch or one cake. To find out dry weight, we should know the desired dry density of final block. Let us work on the density of 600 kg/m³. Batch Weight = Density x Mould volume Density = 600 kg/m3 Dimensions of the mould : Length = 4840 mm = 4.84 M Width = 1250 mm = 1.25 M Height = 670 mm = 0.67 M Volume of the mould: 4.84 M x 1.25 M x 0.67 M = 4.0535 M³ Batch Weight = 600 x 4.0535 = 2432 kg (We have taken mould height 670 mm, which is actually depth of the mould. Generally we maintain the cake height equal to mould level. But in some AAC factories, cake height may be 650 mm or 680 mm depending on the parameters like quantity of returns required, sinking of cake, uneven surface of the cake, etc., In this case cake height should be taken to calculate the volume.) Batch weight or Dry weight consists of binders (Cement and Quicklime), Fly ash or Sand, returns and anhydrite. Usually th

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Definition of AAC Blocks AAC Blocks A - Autoclaved A - Aerated C - Concrete Autoclaved aerated concrete is a lightweight concrete containing uniformly distributed voids that is subjected to high-pressure steam curing. Production of AAC Blocks This is a light- weight building material produced by autoclaving a set mix of fine siliceous materials such as ground silica sand or flyash and the binders like Portland cement and lime. Lightness is achieved by incorporating a large proportion of closed microscopic pores in the slurry with the help of entraining or foaming agent. The basic raw materials are fine-ground sand or fly ash, cement, quicklime, anhydrite or gypsum, water, and aluminum powder or paste as a rising component. A suitable mixture of these raw materials is poured into a mould, and the rising process starts due to the development of hydrogen gas formed by the reaction of aluminium in the alkaline suspension. After 20 to 40 minutes the maximum rising

Nuts and Bolts of AAC Blocks Manufacturing

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