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A method for preparing magnesium silicate-based composite adsorption material by multiple co-precipitation method

A composite adsorption material and a technology of co-precipitation method are applied in the field of preparing magnesium silicate-based composite adsorption materials by multivariate co-precipitation method. Large-scale application, high adsorption capacity, and the effect of improving specific surface area

Active Publication Date: 2022-04-12
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific surface area of ​​natural magnesium silicate is relatively small (2 / g), the adsorption capacity is low, which greatly limits its application range and use effect

Method used

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  • A method for preparing magnesium silicate-based composite adsorption material by multiple co-precipitation method
  • A method for preparing magnesium silicate-based composite adsorption material by multiple co-precipitation method
  • A method for preparing magnesium silicate-based composite adsorption material by multiple co-precipitation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The preparation of hollow magnesium silicate-based composite adsorption material microspheres comprises the following steps:

[0053] (1) Add 300 mL of 0.8 mol / L sodium silicate solution into the reaction kettle, and adjust its pH to 11.26 with a sulfuric acid solution with a hydrogen ion concentration of 0.1 mol / L, slowly dissolve 150 mL of 0.8 mol / L magnesium sulfate solution Add it into the sodium silicate solution, control the reaction temperature to 55° C., react for 90 minutes, and stir at 100 rpm to obtain magnesium silicate slurry.

[0054] (2) Add 95 mL of 0.8 mol / L sodium carbonate solution to the magnesium silicate slurry described in step (1), to obtain magnesium silicate magnesium carbonate composite slurry.

[0055] (3) Aging the composite slurry of magnesium silicate and magnesium carbonate in step (2) for 12 hours, filtering and washing to obtain a composite filter material of magnesium silicate and magnesium carbonate.

[0056] (4) Magnesium silicate m...

Embodiment 2

[0059] The preparation of hollow magnesium silicate-based composite adsorption material microspheres comprises the following steps:

[0060] (1) Add 3L of 0.1mol / L potassium silicate solution into the reaction kettle, adjust the pH to 11.39 with hydrochloric acid solution with a hydrogen ion concentration of 3mol / L, and slowly add 1.5L of 0.1mol / L magnesium chloride solution In the potassium silicate solution, the reaction temperature was controlled to be 10° C., the reaction time was 60 minutes, and the stirring rate was 60 rpm to obtain magnesium silicate slurry.

[0061] (2) Add 0.43L of potassium bicarbonate solution 0.43L of 0.1mol / L and 0.43L of potassium carbonate solution of 0.1mol / L in the magnesium silicate slurry described in step (1), obtain magnesium silicate magnesium carbonate composite slurry .

[0062] (3) Aging the composite slurry of magnesium silicate and magnesium carbonate in step (2) for 3 hours, filtering and washing to obtain a composite filter materi...

Embodiment 3

[0066] The preparation of magnesium silicate-based composite adsorption material microspheres comprises the following steps:

[0067] (1) Add 20L of 1.3mol / L sodium silicate solution in the reactor, and use a hydroxide ion concentration of 1.5mol / L sodium hydroxide solution to adjust its pH to 11.94, and 1.3mol / L magnesium sulfate 10 L of the solution was slowly added into the sodium silicate solution, the reaction temperature was controlled to be 80° C., the reaction time was 120 minutes, and the stirring rate was 130 rpm to obtain a magnesium silicate slurry.

[0068] (2) Add 4 L of 1.3 mol / L sodium bicarbonate solution to the magnesium silicate slurry described in step (1), to obtain magnesium silicate magnesium carbonate composite slurry.

[0069] (3) Aging the composite slurry of magnesium silicate and magnesium carbonate in step (2) for 18 hours, filtering and washing to obtain a composite filter material of magnesium silicate and magnesium carbonate.

[0070] (4) Magne...

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Abstract

The invention discloses a method for preparing a magnesium silicate-based composite adsorption material by a multi-element co-precipitation method. The method uses a silicate solution and a magnesium salt solution as raw materials to prepare a magnesium silicate slurry; further adding the magnesium silicate slurry to the magnesium silicate slurry Adding carbonate solution to obtain magnesium silicate magnesium carbonate composite slurry; aging, filtering and washing to obtain magnesium silicate magnesium carbonate composite filter material; finally performing drying and molding treatment to obtain magnesium silicate-based composite adsorption material. The invention adds other active ingredients to expand the application range of the material; the method of pulping can improve the uniformity and structural integrity of the composite material. The magnesium silicate-based composite adsorption material microspheres and the hollow magnesium silicate-based composite adsorption material microspheres prepared by the spray drying method have significantly improved specific surface area and adsorption performance. The specific surface area of ​​the material is further improved by adopting the rolling ball granulation method, and the obtained spherical particles of the composite adsorption material are convenient for industrial application due to their complete structure and morphology.

Description

technical field [0001] The invention relates to the technical field of preparation of silicate composite materials, in particular to a method for preparing magnesium silicate-based composite adsorption materials by a multi-component co-precipitation method. Background technique [0002] Adsorption is the most common and economical method for removing various contaminants from various fluids. These fluids include water, various gases, various animal and vegetable fats and mineral oils. Pollutants that need to be removed include various organic pollutants and heavy metal salts in water, impurity gases in various gases, free acids, heavy metals, peroxides and saponified substances in oils, etc. [0003] At present, more adsorption materials are studied, including: natural zeolite, carbon material, silica gel and silicate material. Among them, silicate materials have attracted extensive attention due to their unique lamellar structure and special surface charge adsorption prop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30
CPCB01J20/043B01J20/04B01J20/10B01J20/28016
Inventor 杨儒朱永泉徐杰李敏
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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