Behavior of Alkali Compounds in the Sintering Process
Katsuaki KOBAYASHI, Yoshiaki MIURA, Akira OKAMOTO
Alkali compounds in sinter mix have an important effect upon blast furnace practice and gas cleaning work of sinter plant.
In order to clarify the behavior of alkali compounds in the sintering process, some fundamental experiments were made on chlorine roasting of alkali compounds. Experiments were carried with an electric furnace and small sintering pot using mixtures of alkalifeldspar as alkali source, NaCl and CaCl2 as chloline source and in some cases, FeS as sulphur source.
The main results obtained are as follows:
(1) It was found that formation of volatile alkali compounds increased in proportion to the amount of chlorine in raw materials.
(2) Sulphides in raw materials had an effect to retsrain voltalization of alkali compounds.
(3) Volatilization of alkali compounds into waste gas was remarkable at the last stage of the sintering process.
(4) Volatile alkali compounds consisted of alkali chloride, mainly KCl and alkali sulphate, (Na, K) 2SO4 as a minor component.