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Preparation method for modified bentonite

A technology of bentonite and calcium-based bentonite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as complicated preparation process and difficult application in industrial production

Inactive Publication Date: 2019-01-29
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process of the above method is complicated and difficult to be applied to industrial production

Method used

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  • Preparation method for modified bentonite
  • Preparation method for modified bentonite

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preparation example 1

[0037] Preparation Example 1-Preparation of calcium-based bentonite

[0038] Mix 100g of natural calcium-based bentonite and water evenly at a mass ratio of 1:12, let it stand, and layer into supernatant, middle emulsion and lower solid sediment, and take the middle emulsion. Add water to the middle emulsion, mix evenly, let it stand, and stratify again into supernatant, middle emulsion and lower solid sedimentation. Take the middle layer emulsion obtained by layering again, and repeat washing with water to remove impurities 3 times. The middle layer emulsion obtained by the fifth water washing was centrifuged and dried to obtain 62 g of calcium-based bentonite with a montmorillonite content of 97 wt%. The composition (weight percent) of calcium-based bentonite includes Na 2 O 0.22%, K 2 O 0.066%, MgO 3.35%, CaO 1.43%, MnO 2 0.01%, SiO 2 64.6%, TiO 2 0.074%, Al 2 o 3 11.86%, FeO1.49%, Fe 2 o 3 1.44%.

Embodiment 1

[0040] (1) 5g of calcium-based bentonite (preparation example 1) is mixed with deionized water to form a calcium-based bentonite slurry with a concentration of 5wt%, and the calcium-based bentonite slurry is stirred and heated to 65 ° C, then 6g of NaCl solid is added to the In the calcium-based bentonite slurry, the first mixed solution was obtained, stirred for 5 hours, left standing, and centrifuged to obtain a crude sodium-based bentonite. The crude sodium-based bentonite was washed 4 times and dried to obtain 4.7 g of sodium-based bentonite. 3 g of sodium bentonite was mixed with deionized water to form a suspension of 2 wt % sodium bentonite, and the pH was adjusted to 4.6 with nitric acid at a concentration of 0.5 mol / L.

[0041] (2) AlCl with a concentration of 0.5mol / L 3 Aqueous solution and 0.5mol / L La(NO 3 ) 3 The aqueous solution is mixed uniformly according to the volume ratio of 5:1 to obtain the second mixed solution. The second mixed solution is heated to 40°...

Embodiment 2

[0044] (1) 5g of calcium-based bentonite (preparation example 1) is mixed with deionized water to form a calcium-based bentonite slurry with a concentration of 7wt%, and the calcium-based bentonite slurry is stirred and heated to 60°C, and then 7g of NaCl solid is added to the In the calcium-based bentonite slurry, the first mixed solution was obtained, stirred for 4 hours, allowed to stand, and centrifuged to obtain a crude sodium-based bentonite. The crude sodium-based bentonite was washed 5 times and dried to obtain 4.9 g of sodium-based bentonite. 2 g of sodium bentonite was mixed with deionized water to form a suspension of 2 wt % sodium bentonite, and the pH was adjusted to 4.3 with hydrochloric acid with a concentration of 0.3 mol / L.

[0045] (2) AlCl with a concentration of 0.4mol / L 3 Aqueous solution and CeCl with a concentration of 0.4mol / L 3 The aqueous solution is mixed uniformly according to the volume ratio of 10:1 to obtain the second mixed solution. The second...

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Abstract

The invention discloses a preparation method for modified bentonite, comprising: (1) mixing a calcium bentonite slurry with a sodium salt modifier to obtain a first mixed liquid, and treating the first mixed liquid to obtain sodium bentonite, and using the sodium bentonite to prepare a sodium bentonite suspension having a pH value of 3.0 to 6.0; (2) mixing a soluble aluminum salt solution with a soluble rare earth salt solution to obtain a second mixed solution, and dropwise adding an alkaline solution to the second mixed solution to obtain a pillaring agent; and (3) mixing the pillaring agentwith the sodium bentonite suspension to obtain a modified bentonite crude product, and then conducting multiple times of water washing, drying and calcination to obtain the modified bentonite. The method of the present invention is advantageous for achieving industrial production, and is capable of obtaining modified bentonite having significantly increased surface layer spacing and specific surface area.

Description

technical field [0001] The invention relates to a preparation method of bentonite, in particular to a preparation method of modified bentonite. Background technique [0002] Bentonite is a fine-grained silicate clay mineral mainly composed of montmorillonite. Because of its physical and chemical properties such as good adsorption, large water-based swelling and strong ion exchange, it is widely used in many fields such as metallurgy, environmental protection, machinery, etc. field. All or part of the exchangeable ions between bentonite mineral layers are replaced with specific ions or ionic groups, and these specific ions and ionic groups are fixed between the layers to obtain two-dimensional interlayer pores, large specific surface area and Pillared bentonite with high thermal stability. After being modified by pillars, bentonite can be used as adsorbent and catalyst, showing excellent performance, and has good application prospects in the fields of environment and materi...

Claims

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Application Information

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IPC IPC(8): C01B33/40B82Y40/00
CPCB82Y40/00C01B33/40C01P2006/12
Inventor 张文娟马莹王其伟宋静丁艳蓉郝一凡候少春赵永志
Owner BAOTOU RES INST OF RARE EARTHS
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