赤泥硫酸铵焙烧浸出液水解制备偏钛酸的研究

doi:10.19964/j.issn.1006-4990.2022-0191

Abstract

Abstract:

Metatitanic acid was prepared by controlled hydrolysis of the titanium component in the leaching solution of the roasted mixture of red mud and ammonium sulfate to recover titanium.Firstly，reduced iron powder was added as reducing agent to reduce Fe³⁺ into Fe²⁺ in the leaching solution.Then，the hydrolysis conditions were controlled，and the Ti⁴⁺ in the leaching solution was hydrolyzed to synthesize metatitanic acid and was separated and recovered.The research results showed that the optimal hydrolysis conditions for the titanium component in the leaching solution were determined as follows：theoretical amount of the added reduced iron powder required for complete reduction of Fe³⁺ into Fe²⁺，hydrolysis temperature of 140 ℃，hydrolysis time period of 4 h，hydrolysis ending pH of 2.0，and added titanium amount in the metatitanic acid seed of 9% of the total titanium content in the leaching solution.Under the above optimal process conditions，the hydrolysis efficiency of titanium in the leaching solution was reached as high as 95%.The metatitanic acid product had anatase crystal form and low crystallinity.The morphology of the product was irregular circular spheres with massive agglomeration to a certain extent.Since the metatitanic acid particle adsorbed a certain amount of sulfate，the calculated product composition was determined as TiO₂·0.7H₂O·0.08SO₃.

Key words: selective hydrolysis, red mud, ammonium sulfate, titanium, metatitanic acid

CLC Number:

P618.47

PAN Sicheng,XU Hongbin,ZHANG Hongling,DONG Yuming,ZHANG Hongjun,LOU Taiping. Study on preparation of metatitanic acid by hydrolysis of leaching solution of roasted mixture of red mud and ammonium sulfate[J]. Inorganic Chemicals Industry, 2023, 55(2): 85-91.

Figures/Tables 11

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组成	质量浓度/（g·L^-1）	组成	质量浓度/（g·L^-1）
Ti⁴⁺	4.10	SO₄^2-	139.24
Al³⁺	14.35	NH₄⁺	23.43
Fe³⁺	25.51	H⁺	0.12
Na⁺	10.16

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Study on preparation of metatitanic acid by hydrolysis of leaching solution of roasted mixture of red mud and ammonium sulfate

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