氯化铁溶液赤泥控碱作用及效果

doi:10.19964/j.issn.1006-4990.2023-0049

Abstract

Abstract:

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.

Key words: red mud, FeCl₃ solution, alkaline regulation, mineral facies component, alkali control mechanism

CLC Number:

X753

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.

Figures/Tables 12

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元素	加标回收率/%	全量/（g·kg^-1）
Ca	109.52±0.75	110.94±1.96
Na	85.93±0.71	40.42±0.34
Mg	114.98±1.39	1.82±0.02
K	93.86±0.69	1.58±0.04

样品		w（水化石榴石）/%	w（赤铁矿）/ %	w（钙霞石）/ %	w（铝酸三钙）/%	w（方钠石）/ %	w（CaCl₂）/ %	w（三水铝石）/%	w（NaCl）/ %
赤泥		44.1	28.9	9.8	6.6	4.4	3.4	2.8	—
2 d	去表泥	37.3	26.4	10.9	14.2	3.4	5.7	2.1	—
2 d	表泥	30.0	28.3	9.4	10.8	1.2	3.0	10.7	6.7
6 d	去表泥	39.4	27.0	13.0	9.1	5.2	4.9	1.4	—
6 d	表泥	28.0	24.7	9.6	18.2	1.9	8.1	4.6	4.9
18 d	去表泥	39.4	26.4	9.9	11.4	4.5	5.2	3.2	—
18 d	表泥	28.0	26.9	10.8	16.3	1.8	5.8	5.8	4.5
60 d	去表泥	31.5	26.5	9.6	14.4	3.7	5.8	6.7	1.7
60 d	表泥	30.2	24.5	15.2	13.2	0.1	6.0	8.1	2.8

样品	比表面积/ （m²·g^-1）	吸附总孔体积/ （m³·g^-1）	吸附平均孔径/ nm	吸附最可几孔径/ nm	脱附平均孔径/ nm	脱附最可几孔径/ nm
赤泥	6.720	0.047	23.060	171.808	22.547	52.073
6 d	24.899	0.048	9.514	194.136	9.023	4.120
18 d	17.630	0.059	12.040	139.209	11.438	4.001
30 d	21.917	0.070	11.938	109.650	11.977	4.086

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Function and effect of ferric chloride solution in alkaline regulation of red mud

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