The six major modification methods of bentonite, a general talk, after reading you will understand!
2022-03-11
The modification operation of bentonite usually uses physical, chemical and mechanical methods to treat the surface of natural bentonite. According to the required purpose, the physical or chemical properties of the bentonite surface are changed to meet the application of bentonite in different technical fields. At the same time, the function and use value of bentonite can be improved. Some are used to change the characteristics of bentonite and some are used to change a certain ability of bentonite, improve the corresponding ability effect.
What are the most common bentonite modification methods? Xiaobian through finishing, a total of five kinds of modification methods: acid modification, roasting calcination method, sodium method, salt modification method, organic modification method. below a detailed understanding of it.
1. Sodium modification method
In the practical application of bentonite, it is found that the exchange capacity of Ca2 in calcium-based soil is much lower than that of Na. Therefore, calcium-based soil is often put into market after sodium. Commonly used sodium agents are NaF, Na2CO3, NaCl, NaNO3, NaSO, etc.
2. Roasting activation modification method
The calcination activation modification method is to calcine bentonite at different temperatures for a certain period of time. This calcination, so that the bentonite in turn lost the surface of the water, the framework of the binding water, the organic pollutants in the channel, resulting in an increase in air rate, the structure is more loose, and ultimately increased the adsorption of bentonite.
3. Organic modification method
The principle of organic modification method makes bentonite organic and obtains organic composite bentonite. This modification method, so that the bentonite from hydrophilic hydrophobic completely changed known as lipophilic hydrophobic. Organic modification is used to enhance the ability of bentonite to remove organic matter by increasing the interlayer distance of bentonite.
4. Inorganic modification method
The principle of inorganic modification method is similar to organic modification method, mainly through the expansion characteristics of bentonite, and the interlayer cation exchangeability of bentonite, these two characteristics, the natural bentonite is modified. After inorganic modification of natural bentonite, the spacing between layers is obviously increased, which can also improve the adsorption effect.
5. Inorganic/organic composite modification method
The principle of inorganic/organic composite modification method is based on two characteristics of bentonite: 1. the layer gap of bentonite is relatively large; 2. the cation exchangeability of bentonite. The method is to first use inorganic polymer to open the interlayer domain of bentonite to make the spacing larger, and then change the surface properties of bentonite by activator.
The commonly used preparation method first uses polyhydroxy cation to treat bentonite, which increases the interlayer domain of bentonite, resulting in charge reversal, and then adds organic surface activator to change its surface properties.
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