| 摘要 |
<p>The invention relates to a method for suppressing dust emissions from an expanded clay made up of porous particles, and to an expanded clay produced by the method. The essential idea of the invention is that the surface of the expanded clay particles is treated with a solution which contains an alkali metal salt or earth alkali metal salt, whereafter the particles are dried. The treatment may be carried out by immersing the particles in the solution or by spraying the solution onto the particles. Suitable salts include sodium and potassium formiates and sodium silicate. The amount of alkali metal salt or earth alkali metal salt introduced onto the surface of the particles may in expanded clay according to the invention be approx. 0.5-6 %, most preferably approx. 2.0-4.0 %, of the weight of the expanded clay.</p> |
