转底炉氧化锌粉高值化利用研究

doi:10.19964/j.issn.1006-4990.2022-0263

Abstract

Abstract:

Aiming at the problem of low added value of zinc oxide powder in rotary hearth furnace，the zinc oxide powder in rotary hearth furnace was taken as the research object，and the choline chloride-oxalic acid dihydrate（CC-OA） deep eutectic solvent was used as the research system.The selective solubility of deep eutectic solvent was used to purify zinc oxide powder and prepare nano-zinc oxide，and the kinetics of nano-zinc oxide grain growth was studied.The optimal solution for zinc oxide powder washing treatment was that the washing temperature was 50 °C，the washing time was 3 min，and the liquid-solid ratio was 3 mL/g.The precursor obtained by treating zinc oxide powder with deep eutectic solvent was ZnC₂O₄·2H₂O.According to the phenomenological equation，the relationship between roasting temperature，roasting time and particle size was calculated，and the preparation of nano-zinc oxide with specific particle size was realized.Under the conditions of calcination temperature of 400 ℃ and calcination time of 2 h，the content of zinc oxide could reach 99.768%.The morphology was relatively uniform and spherical，and the average particle size was 28.5 nm and the particle size was mainly distributed between 10~100 nm.

Key words: rotary hearth furnace, zinc oxide powder, deep eutectic solvent, nanometer zinc oxide, kinetics

CLC Number:

TQ 132.41

YAO Haiwei,MAO Rui,WANG Fei,ZHU Zuoqiao. Study on high-value utilization of zinc oxide powder in rotary hearth furnace[J]. Inorganic Chemicals Industry, 2022, 54(12): 119-125.

Figures/Tables 17

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项目		w（ZnO）/ %	电镜平均粒径/nm	比表面积/ （m²·g^-1）	团聚指数	w（Pb）/ %	w（Mn）/ %
CC-OA法		99.768	28.5	33.8	—	0	—
GB/T 19589—2004《纳米氧化锌》	1类	≥99.0	≤100	≥15	≤100	≤0.001	≤0.001
	2类	≥97.0	≤100	≥15	≤100	≤0.001	≤0.01
	3类	≥95.0	≤100	≥15	≤100	≤0.03	≤0.005
德国拜耳公司标准		93~96	50	45	—	≤0.04	≤0.002
项目		w（Cd）/ %	w（Hg）/ %	w（105 ℃挥发物）/%	w（水溶物）/ %	w（盐酸不溶物）/%	灼烧失量/ %
CC-OA法		—	—	0.32	0.048	0.011	1.28
GB/T 19589—2004《纳米氧化锌》	1类	≤0.001 5	≤0.000 1	≤0.5	≤0.1	≤0.02	—
	2类	≤0.005	—	≤0.5	≤0.1	≤0.02	≤2
	3类	—	—	≤0.7	≤0.7	≤0.05	≤4
德国拜耳公司标准		—	—	—	1.0	—	3~6

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Study on high-value utilization of zinc oxide powder in rotary hearth furnace

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