Synthesis, characterization and properties of organically compounded bentonite by molecular intercalation process
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ORIGINAL PAPER
Synthesis, characterization and properties of organically compounded bentonite by molecular intercalation process Si‑wei Li1 · Jian Pan1 · De‑qing Zhu1 · Zheng‑qi Guo1 · Ji‑wei Xu1 · Jian‑lei Chou1 Received: 31 August 2019 / Revised: 5 December 2019 / Accepted: 29 December 2019 © China Iron and Steel Research Institute Group 2020
Abstract A new process for manufacturing organically compounded bentonite was developed successfully based on the organic intercalation and layered structure of bentonite. The main steps in the proposed process included wet sodium activation of bentonite ore, organic compounding and high-pressure roll grinding. The optimum procedure is recommended as follows: 5 mass% of sodium carbonate powder and 30 wt.% water are added to activate the bentonite ore for 24 h to prepare activated bentonite; 0.5 wt.% of organic molecules are added into the activated bentonite for organic compounding for 12 h; then, the high-pressure roll grinding is followed to treat the organically compounded bentonite; and finally, drying and fine grinding are performed for preparing the final organically compounded bentonite product with 10 wt.% moisture and 98% passing 0.074 mm. The obtained organically compounded bentonite was characterized using an X-ray diffractometer, a scanning electron microscope and an X-ray photoelectron spectrometer. To confirm the effect of organically compounded bentonite on green balls, the pelletizing tests were carried out. The results showed that high-pressure roll grinding can not only enhance the ability of the crystal layer to hold the combined water, but also strengthen the intercalation compounding of the organic additive, which is beneficial for the formation of a fiber-interlaced structure of the organically compounded bentonite and improves the quality index of the bentonite itself. Also, the organically compounded bentonite is helpful to improve the indexes of green balls. Keywords Organic intercalation · Sodium activation · Organically compounded bentonite · High-pressure roll grinding · Fiber-interlaced structure
1 Introduction To improve the ballability of iron concentrates and enhance the performance of green balls and dry pellets in the production of iron ore pelletizing, the bentonite was usually used as a binder in the pelletizing process [1]. * Jian Pan [email protected] * Zheng‑qi Guo [email protected] Si‑wei Li [email protected] De‑qing Zhu [email protected] Ji‑wei Xu [email protected] Jian‑lei Chou [email protected] 1
School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China
Bentonite, a very important nonmetallic mineral, is mainly composed of montmorillonite [2, 3], which is an aqueous aluminosilicate with the remarkable expansion and water absorption performances [4, 5]. When organic molecule enters the layered structure of montmorillonite, the bentonite may have strong expansion, absorption and bonding performances [6]. Due to the good properties and low price, the bentonite is widely used
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