Process for producing a constant density lightweight aggregate

Details Process for producing a constant density lightweight aggregate Process for producing a constant density lightweight aggregate

C - Chemistry, Metallurgy

04

B

261/2, 39/52

C04B 43/00 (1980.01)

Patent

CA 1090124

ABSTRACT OF THE DISCLOSURE The present invention provides a process for prepar- ing a granular lightweight aggregate, comprising the stages of pre-drying one or more raw materials, adding additives to the raw material, homogenizing the raw material and additives, pelletizing the homogenized material in predetermined sizes, powdering the grains with a further substance, preheating the grains in a kiln to a temperature substantially less than the softening point of the grains and expanding or burning the grains at least to the softening temperature of the material, wherein during said grain preheating stage the oxygen rate in the atmosphere in which the grains are preheated is strictly cont- rolled, this oxygen rate being fixed in accordance with the required final density of the aggregate to be obtained from one or more predetermined raw materials, in the sense of making this atmosphere reducing when said density is to be low, and oxidising when said density is to be high.

252737

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