铁尾矿酸浸液制备聚氯化铁的试验研究

doi:10.19964/j.issn.1006-4990.2023-0173

Abstract

Abstract:

In order to explore a new approach to the recovery and utilization of iron tailings from an iron ore dressing plant，the experimental process of preparing polymeric iron chloride from the acid leaching solution of the iron tailings was studied，and the self-made polymeric ferric chloride was applied to the coagulation test of kaolin suspension to test the flocculation performance of the product.The experimental results showed that the suitable conditions for polymerization were temperature 40 ℃，pH of 1.0，and polymerization time 3 h.Under these conditions，the alkalinity of synthesized polymerized ferric chloride was 20.91%，which met relevant standards，and the primary and secondary ranking of factors affecting the polymerization process were polymerization temperature，pH and polymerization time.The suitable conditions for coagulation were the dosage of polymeric ferric chloride of 250 mg/L，pH of 7.0，stirring time of 3 min，temperature of 20 ℃ and coagulation time of 60 min.Under these conditions，the turbidity removal rate was 95.54%，and the product had a good turbidity removal effect.

Key words: polyferric chloride, iron tailings, acid leaching solution, polymerization, coagulation

CLC Number:

TK09

HUANG Tao, HUANG Zili, XIAO Shuo, ZHENG Jiemiao, LIU Xiaofeng, WU Jilong. Experimental study on preparation of polyferric chloride from iron tailings acid leaching solution[J]. Inorganic Chemicals Industry, 2024, 56(2): 121-126.

Figures/Tables 13

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铁物相	w（Fe）/%	分布率/%
赤褐铁矿	23.6	85.26
菱铁矿	3.45	12.46
硅酸铁	0.50	1.81
硫化铁	0.11	0.4
磁铁矿	0.02	0.07
全铁	27.68	100

试验	聚合温度/℃	聚合pH	聚合时间/h	盐基度/%
1	30	0.8	2	6.12
2	30	1.0	4	9.81
3	30	1.2	3	8.64
4	40	0.8	4	12.41
5	40	1.0	3	20.31
6	40	1.2	2	15.39
7	50	0.8	3	4.78
8	50	1.0	2	6.09
9	50	1.2	4	5.43
k₁	8.19	7.77	9.20
k₂	16.04	12.07	11.24
k₃	5.43	9.82	9.22
R	10.60	4.30	2.04

指标项目	w （Fe³⁺）/%	w （Fe²⁺）/%	盐基度/ %	w（水不溶物）/%	密度（20 ℃）/ （g·cm^-3）
标准	≥8.0	≤0.2	5.0~30.0	≤0.3	≥1.20
自制PFC检测结果	9.26	0.1	20.91	0.1	1.22
指标项目	w （Zn）/%	w （As）/%	w （Pb）/%	w （Hg）/%	w （Cd）/%	w （Cr）/%
标准	≤0.1	≤0.000 5	≤0.002	≤0.000 5	≤0.001	≤0.005
自制PFC检测结果	0.01	—	—	—	—	—

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Experimental study on preparation of polyferric chloride from iron tailings acid leaching solution

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