Magnetic particle-attapulgite composite nano material and preparation method by directly dissolving attapulgite in acid

Abstract

The invention relates to a direct acid-soluble process for preparing magnetism grain concavo-convex baculine stone nanometer composite material and concavo-convex baculine stone, which direct uses acid for dissolution, wherein composite material is loading nanometer magnetism grain on the surface of concavo-convex baculine stone. Selecting sedimentary concavo-convex baculine stone clay as raw materials, dissolving the clay with acidm and dissolving iron ion of the concavo-convex baculine stone crystal structure out, adding alkali for neutralization reaction, making the iron ion dissolved hydrolyze and forming iron hydroxide; dewatering and washing suspending liquid, reduced calcining the solid obtained to make iron hydroxide change into nanometer magnetism grain and load on the crystal surface, to get the magnetism grain concavo-convex baculine stone nanometer composite material. The composite material can be operated with electromagnetic field, to carry out magnetic flocculation, recovery, filtration and target controlling of the concavo-convex baculine stone adsorbent.

Description

Technical field: [0001] The invention relates to a magnetic particle-attapulgite clay composite material endowing attapulgite clay with excellent magnetic properties, and a preparation method thereof. Background technique: [0002] Attapulgite is a hydrous magnesium aluminum silicate mineral with a chain layer structure, which has a large specific surface area and exhibits excellent adsorption activity. However, in its application as an adsorbent, due to the excellent colloidal properties of attapulgite clay, attapulgite clay has high colloidal stability in aqueous suspensions, resulting in difficulties in solid-liquid separation in liquid phase systems. This has always been a difficult problem restricting the industrial application of attapulgite clay adsorbents. There are two traditional solutions. First, the attapulgite clay adsorbent is used in powder form. In order to achieve solid-liquid separation, the attapulgite clay is flocculated and precipitated by adding a floc...

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Problems solved by technology

In this way, adding flocculant will increase the cost, and at the same time, the amount of sludge will be greatly increased and the difficulty of sludge treatment will be increased; the second solution is to granulate attapulgite clay, which needs to be added with binder or High temperature treatment increases the particle size and mass transfer resistance, and reduces the adsorption effect of attapulgite clay. At the same time, the cost is high, and the application in some fields is greatly restricted.

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