The reasons for different effect of lime clays on the strength characteristics of ceramics

It is shown that an increase in the strength characteristics of ceramic products molded from weakly sintered polymineral low-melting clay raw materials and calcareous clays occurs due to an increase in the total amount of montmorillonite component in the charge; organogenic nature of calcite of calcareous clays, which contributes to the creation of a local reducing environment during firing, influencing the transition of Fe ³⁺ to Fe ²⁺ and promoting earlier sintering of clay; the presence of gypsum impurities in calcareous clays, which is a strong flux. Tab. 2, bibliography: 8 titles.