Investigation of adsorption accumulation of microcomponents in various horizonts of laterate bauxite-bearing weatherin profileстатьяНаучная хроникаИсследовательская статьяЭлектронная публикация
Дата последнего поиска статьи во внешних источниках: 21 мая 2019 г.
Аннотация:Experiments on the adsorption of trace
elements on various types of rocks of lateritic weathering
cores have been conducted under static conditions. Results
on the adsorption of trace elements were obtained as a
function of pH (3, 4.5, 5.5, and 7) and of the initial
concentration of the solution (1ppm-20ppb). As
adsorbents, samples of rocks of the bauxite profile (from
the top downwards along the section) were used: cuirass,
bauxites, laterites of transition zone. It is determined that
against a background of high Al content in the solution, as
a result of partial dissolution of gibbsite at pH 3, an
insignificant desorption of most trace elements is observed.
Significant adsorption was revealed for Ga, Sc.
Microelements Be, Y, As, U, Pb, REE are adsorbed almost
completely at pH 4.5-7. The partial adsorption is observed
for Co, Ni, Cu and Cd. The absorption values of V, Th, and
Bi by the solid phase, regardless of the rock and the pH,
were 98-100%. The experimental data are in good
agreement with the accumulation of trace elements in the
profile of lateritic bauxiton weathering crusts.