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Method for preparing magnetic granule-attapulgite nano composite material

A nano-composite material and attapulgite technology, which is applied in the field of magnetic particle-attapulgite clay composite material preparation, can solve the problems of increased cost of flocculants, increased difficulty in sludge treatment, reduced adsorption effect of attapulgite clay, and the like, To achieve the effect of excellent adsorption performance

Inactive Publication Date: 2006-10-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Method for preparing magnetic granule-attapulgite nano composite material
  • Method for preparing magnetic granule-attapulgite nano composite material
  • Method for preparing magnetic granule-attapulgite nano composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The specific implementation is as follows:

[0024] 1. The attapulgite clay and water that have been processed through extrusion and mud refining are made into an attapulgite clay suspension with a mass volume ratio of 0.1:100 to 20:100, preferably a solid-to-liquid ratio of 1:100 to 5:100, Stirring promotes the dispersion of attapulgite crystal bundles to form a stable attapulgite clay suspension;

[0025] 2. Under the condition of strong stirring, add divalent iron salt solution to the dispersed attapulgite clay suspension, the concentration of the iron salt solution is 1%-50%, preferably 5%-10%. The mass ratio of iron to attapulgite clay in the attapulgite clay and iron salt mixture is 100:0.5-100:30, preferably 100:1-100:5. The iron salt referred to includes ferrous sulfate, ferrous chloride, and ferric chloride. The above suspension is heated to 50°C to 100°C, preferably 60°C to 80°C.

[0026] 3. In addition, prepare a mixed solution of nitrate and lye, the conc...

Embodiment 2

[0031] The difference from the above-mentioned Example 1 is that in order to make the crystal particle size of the magnetic particles formed by direct crystallization from the solution smaller, 0.1% by weight of the attapulgite clay is added to the attapulgite clay suspension prepared in step 1. Citric acid, or citrate, or phosphate, as a crystal growth control agent. Other steps are the same as in Example 1. Finally, the particle size of the magnetic particles loaded on the surface of the attapulgite is less than 15 nanometers ( Figure 4 shown).

Embodiment 3

[0033] The specific implementation is as follows:

[0034] 1. The attapulgite clay and water that have been processed through extrusion and mud refining are made into an attapulgite clay suspension with a mass volume ratio of 0.1:100 to 20:100, preferably a solid-to-liquid ratio of 1:100 to 5:100, Stirring promotes the dispersion of attapulgite crystal bundles to form a stable attapulgite clay suspension;

[0035] 2. Add the mixed solution of ferrous iron salt and ferric iron salt to the dispersed attapulgite clay suspension under strong stirring condition. The molar ratio of ferrous salt to ferric salt is 3:1~1:1, preferably 1:1;

[0036]3. Add lye to the above suspension under vigorous stirring, the molar ratio of lye to iron salt is 8:3, stir and age the crystal for 0.5-5 hours.

[0037] 4. Dehydrating, washing and drying the suspension obtained in the above steps to obtain a magnetic particle-attapulgite clay composite material. The magnetic susceptibility of the obtain...

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Abstract

The invention is a method for preparing magnetic grain-attapulgite nano composite, characterized in using attapulgite clay and iron salt as raw materials, by nucleation of bivalent, or bivalent and trivalent iron ions on the attapulgite surface and their stable action on crystal nucleus, caused by the attapulgite clay, directly crystallizing nano magnetic grains in solution, and depositing on the surface of the attapulgite crystals, so as to compose the composite. And it has super paramagnetism and strong absorptivity, able to be controlled under the action of magnetic field to implement magnetic flocculation, magnetic recovery, magnetic filtration, and target control of attapulgite sorbent. And it can be widely applied to the fields of purification of industrial raw materials, deep filtration for air purification, nano film material, deep processing for water supply processing, etc.

Description

Technical field: [0001] The invention relates to a method for preparing a magnetic particle-attapulgite clay composite material endowing attapulgite clay with excellent magnetic properties. Background technique: [0002] Attapulgite is a hydrous magnesium aluminum silicate mineral with a chain-layer structure, which has a rod-like crystal shape with a diameter of about 30nm to 40nm, and is an important natural nano-mineral material. Because attapulgite crystals belong to nanoscale characteristics, attapulgite has a huge surface area and adsorption activity, and has important potential application value as an adsorbent. [0003] 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 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
Inventor 陈天虎谢巧勤庆承松彭书传
Owner HEFEI UNIV OF TECH
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