Ceramic Industry

Efficient cleaning of acid gases

In production of tiles, expanded clay and bricks, where large numbers of small units need simple and effective air emission control systems, the SOLVAir® bicarbonate process enables users to respect local regulations and to cut treatment costs. 

In tile manufacturing (terracotta tiles, bricks and floor tiles) the combustion gas purification system needs to take into account: 

  • The type of fuel used. For example, heavy fuel oil produces large quantities of sulfur dioxide (SO2).
  • The type of raw materials used. There are several types of clay: red clay, white clay with a high carbonate content, clay containing marine sediments, sulfur compounds and in some cases, feldspar containing fluorides.

The main acid pollutants are therefore: sulfur dioxide (SO2), hydrochloric acid (HCl) and hydrofluoric acid (HF).

The SOLVAir® Solution: high energy recovery by using bicarbonate process

With the SOLVAir® bicarbonate solution, local regulations for acid pollutants are respected. Experience has also shown bicarbonate to be demonstrably more effective than the action of other sorbents. 

In addition, in some circumstances, the cleaned flue gases can be reused to pre-heat the raw material, allowing a great saving in energy consumption and CO2 emissions. Therefore, it is necessary that the flue gases contain a very low level of acid pollutants in order to avoid acid condensation and corrosion. Only the sodium bicarbonate BICAR® is able to reach this kind of performances, avoiding in same time great excesses of reagent.