Characterization of the Activity, Mineralogy and Correlations between the Properties of Clayey Soils

Abstract

The activity is related to the mineralogy and geological history of clays. Soils with the same value of the liquidity limit or plasticity index can have very different characteristics depending on the amount and type of clay minerals. The methylene blue value characterizes the activity of the clays and reflects the surface activity. Ten inactive soils contain minerals (kaolinite, illite), these soils absorb little water. Two swelling soils have normal activity and are composed of minerals (kaolinite, illite, Montmorillonite). The relationships between clayey soils properties, their activities and between the activity and the liquidity limit are defined. The correlations obtained are linear fit and exponential and sigmoidal fits. The correlations obtained with a coefficient of determination of R 2 (0.859 -0.999) can be used to characterize and predict certain parameters of fine-grained soils as a function of clay content.

Tennantite and Enargite Rejection in the Copper Flotation—A Mini-Review

“…Consequently, fine regrinding is required to liberate these minerals to enable differential flotation of the copper-Arsenic and the primary copper minerals. Recently two research both incorporated regrinding into a copper flotation circuit to effect liberation of Tennantite and Tetrahedrite from Chalcopyrite [13] [14] [15]. Although, this approach achieved significant improvement in copper recovery, there were still some challenges (e.g.…”

Activities and intrinsic properties of the clayey fines four lateritic gravels

“…The soil blue value characterizes the activity of the clay fines in lateritic gravelly soils and reflects surface activity [18]. The specific surface depends on the mineralogy, organic composition and texture of lateritic gravelly soils [14,[24][25][26].…”

“…Ac activity characterizes the mineral contained in the fine clay of lateritic gravels. When the clay content is high enough, grains larger than two micrometers are embedded in the clay and hardly touch each other [24][25][26]. In Figure 7, Ac -are the directing coefficients of the straight lines delimiting the areas of activity of the clay fraction of lateritic gravels (inactive, normal and active).…”