高强萤石尾矿陶粒的制备及其性能研究

doi:10.19964/j.issn.1006-4990.2022-0397

Abstract

Abstract:

Fluorite tailings-based lightweight high-strength ceramsite was prepared by sintering with fluorite tailings and clay as raw materials and silicon carbide（SiC） as foaming agent.The effects of the amount of fluorite tailings，sintering temperature，sintering duration and SiC external dosage on the properties of ceramsite were systematically investi-gated.The crystal phase and microstructure of the obtained ceramsite samples were also analyzed by thermodynamic calculation，X-ray diffraction spectrum，scanning electron microscope and other detection methods.The results showed that when the proportion of fluorite tailings was 70%（mass fraction），the proportion of clay was 30%（mass fraction），the external proportion of SiC was 0.5%（mass fraction），the preheating temperature was 450 ℃，the preheating time was 15 min，the sintering temperature as 1 210 ℃，the sintering time was 30 min，and the heating rate was 5 ℃/min，the fracturing force of the obtained fluorite tailings ceramisite was 527.9 N，the apparent density was 0.89 g/cm³，the water absorption rate was 0.21% in 1 h，and the cylinder compressive strength was 4.63 MPa，the bulk density was 594.6 kg/m³，which met the requirements of Grade 600 high-strength ceramsite for lightweight aggregates in GB/T 17431.1—2010 “Lightweight Aggregates and Experimental Methods”.The research results could provide a new method for the resource utilization of fluorite tailings.

Key words: fluorite tailings, high-strength ceramsite, sintering, resource utilization

CLC Number:

O613

LI Yu, ZHAO Wei, ZHANG Xinghua, WANG Rui, YAN Bingji, GUO Hongwei. Syudy on preparation of high-strength ceramsite from fluorite tailings and its properties[J]. Inorganic Chemicals Industry, 2023, 55(5): 100-108.

Figures/Tables 16

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m（萤石尾矿）∶ m（黏土）	w（SiO₂）/ %	w（Al₂O₃）/ %	w（Fe₂O₃）/ %	w（CaO）/ %	w（MgO）/ %	w（Na₂O）/ %	w（K₂O）/ %	w（CaF₂）/ %
6∶4	68.098	12.152	3.310	4.354	1.068	0.996	3.262	2.464
7∶3	68.646	11.894	3.055	4.438	0.936	0.867	3.359	2.858
8∶2	69.194	11.636	2.800	4.522	0.804	0.738	3.456	3.252
9∶1	69.742	11.378	2.545	4.606	0.672	0.609	3.553	3.646

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Syudy on preparation of high-strength ceramsite from fluorite tailings and its properties

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m（萤石尾矿）∶ m（黏土）	w（萤石尾矿）/ %	w（黏土）/ %	[m（SiC）/ m（物料）]/%
6∶4	60	40	0.5
7∶3	70	30	0.5
8∶2	80	20	0.5
9∶1	90	10	0.5