Inorganic Chemicals Industry >
Function and effect of ferric chloride solution in alkaline regulation of red mud
Received date: 2023-02-03
Online published: 2023-11-16
To address the problems of strong alkalinity and high cost of controlling alkalinity in the process of alkaline regulation of red mud，it was proposed that FeCl3 solution produced by recovering refined iron powder from red mud worked as an alkali control agent to control alkalinity and conduct aging of red mud.The results showed that FeCl3 solution could significantly reduce the soluble alkali，such as NaOH，Na2CO3，NaHCO3，NaAl（OH）4 in red mud，and the combined alkali，like hydrated garnet and sodalite，had different degrees of dissolution and transformation.The replaced Na+ and Ca2+ ions crystallized in the surface layer of alkali-controlled mud as halite，CaCl2 and other mineral phases.The adsorption and aggregation of Fe3+ made the surface pore diameter of alkali-controlled mud decrease，and the specific surface area was increased significantly，and the surface became compact accordingly，which made the agent penetrate slowly in the early stage of alkali control of red mud and limited alkali control performance.In addition，FeCl3 solution could significantly reduce the alkali content of red mud through neutralization and precipitation.After 30 days of reaction and aging，the pH of the red mud was stabilized at about 8.50，and there was no significant rebound in late aging.The reaction and aging process could be divided into four stages，such as rapid reaction，migration and transformation，dissolution and rebound，and balanced construction.
YUE Yuansui , CHENG Guanwen , XU Min , XU Xiaoyu , ZHANG Zhenlin , NONG Guowu . Function and effect of ferric chloride solution in alkaline regulation of red mud[J]. Inorganic Chemicals Industry, 2023 , 55(11) : 121 -129 . DOI: 10.19964/j.issn.1006-4990.2023-0049
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