Preparation of calcium carbonate with microstructure and nanostructure from carbide slag for CO2 sequestration by using recyclable ammonium chloride--颗粒学报PARTICUOLOGY

Yao, J., Chen, Q., Zeng, L., & Ding, W. (2024). Preparation of calcium carbonate with microstructure and nanostructure from carbide slag for CO2 sequestration by using recyclable ammonium chloride. Particuology, 90, 1-9. https://doi.org/10.1016/j.partic.2023.11.017

Preparation of calcium carbonate with microstructure and nanostructure from carbide slag for CO₂ sequestration by using recyclable ammonium chloride

Jin Yao^{a b}, Qiuju Chen^{a b}, Li Zeng^c, Wenjin Ding^{a b c *}

a Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang, 621010, China
b Sichuan Engineering Lab of Non-metallic Mineral Powder Modification and High-value Utilization, Mianyang, 621010, China
c School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, China

10.1016/j.partic.2023.11.017

Volume 90, July 2024, Pages 1-9

Received 26 September 2023, Revised 2 November 2023, Accepted 2 November 2023, Available online 28 November 2023, Version of Record 16 December 2023.

E-mail: dwjdykclx@163.com

Highlights

• High purity CaCO₃ with different grain sizes, structures, and morphologies is successfully produced.

• NH₄Cl is used to leach Ca²⁺ from carbide slag and can be recycled.

• The crystal phase, grain size, and morphology of CaCO₃ could be controlled by adjusting the reaction conditions.

Abstract

Based on the composition characteristics of carbide slag and the application of polyvinyl chloride, a method of preparing calcium carbonate with microstructure and nanostructure by using carbide slag as a raw material and ammonium chloride as a leaching agent was proposed. The factors for the preparation of calcium carbonate and the effects of different conditions on the crystal phase, grain size, and morphology of calcium carbonate were systematically studied. The results showed that the nanosized calcium carbonate was prepared at 60 mL/min, 25 °C, no additional ammonia, and 60 min. The product of spherical vaterite was in accordance with the relevant standards for the industrial precipitation of calcium carbonate. Moreover, the reuse of carbonation filtrate was realized. The crystal phase, grain size, and morphology of the carbonation product could be controlled by adjusting the reaction conditions. The manuscript provided a new idea for resource utilization of carbide slag and preparing nanocalcium carbonate.

Graphical abstract

Keywords

Carbide slag; Ammonium chloride; Cyclic utilization; Micro and nano structure; Product control

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