10th Chemistry Chapter 13,14,15,16 Notes., · (i) Volcanic eruption. (ii) Combustion of fossil fuels. (iii) Forest fires. (iv) Burning of wood. (v ... Ammonia is recovered in Ammonia recovery tower from ammonium chloride solution and calcium hydroxide formed in lime kiln. 2NH4Cl + Ca(OH)2 ...Cement kiln, · They are released when the fuels are burnt or the kiln feed is heated, and primarily react with the alkalis from the kiln feed to form alkali chlorides. These compounds, which are initially vaporous, condense on the kiln feed or the kiln dust, at temperatures between 700 °C and 900 °C, subsequently re-enter the rotary kiln system and evaporate again.