Effect of organic acids on iron removal from iron-ion kaolinite
PTMS magnetic separation
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Effect of organic acids on iron removal from iron-ion kaolinite
The effects of various organic acids, namely acetic acid, formic acid, citric acid, ascorbic acid, succinic acid, tartaric acid and oxalic acid on the decolorization of the Tiruwanna Tapram Kalliyur iron in southern India and the resulting iron-colored kaolinite clay Improvements were studied. Because of its high acid strength, good complexing ability and strong reducing ability, oxalic acid can obtain the best effect at room temperature and high temperature. Reaction parameters such as time, temperature and reagent concentration were optimized. The optimum conditions required to achieve a brightness of ≥ 80% are: temperature - 100 ° C, oxalic acid concentration - 0.1 M, reaction time - 90 minutes. A 30-day leaching test at room temperature increased the brightness from 66.3% to 83.5% ISO. The corresponding iron oxide removal is about 80%. The addition of ferrous ions and protons improves the kinetics of this structural reaction. Leaching tests on previously selected samples using magnetic separation showed only a slight improvement in brightness, indicating that brightness is more dependent on surface coated iron oxide rather than discrete particles. Compare the effects of acid leaching on the physical properties of clay, such as gloss, plasticity, viscosity, specific surface area and pore volume. A slight increase in specific surface area and pore volume suggests that the clay amorphous alumina, silica and iron oxide are removed from the clay surface, and also due to the delamination produced to some extent. No significant changes were observed in viscosity and plasticity due to delayed processing.
