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Modification method of attapulgite

An attapulgite modification technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of reduced modification efficiency, weak adhesion, and long soaking time of attapulgite, so as to shorten the purification time. and the time required for modification, the effect of improving modification activity, and high industrial value

Active Publication Date: 2011-10-05
LANZHOU UNIVERSITY
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In actual use, using attapulgite as a structural material often requires modification of attapulgite, but due to the lack of uniform purity and weak adhesion, the modification effect of attapulgite is not ideal
[0003] Chinese patents disclose a variety of structural materials with attapulgite as the coating, but in the prior art, attapulgite is often affected due to reasons such as unscientific purification and incomplete modification of attapulgite. performance and function, the viscosity is not enough, and it is easy to cause disintegration when made into a coating or other structural materials
[0004] In the technical scheme disclosed in the patent document CN200510040601.6, the processing of the viscosity of the attapulgite clay is realized through the steps of natural weathering, modification treatment, batching, stirring, toner and detection. The modification treatment step of this patent is natural The weathering step takes 30-120 days, the efficiency is low, and the soaking time required for modification is also long, the purity is not high, the modification is not thorough enough, and the effect is not ideal
[0005] In the technical solution disclosed in the patent document CN200810021918.9, the modified attapulgite is obtained by soaking firstly, and then repeating the steps of secondary extrusion, adding modifier solution, freezing, heat treatment and crushing. This method is relatively simple to operate. However, the modified attapulgite is not very viscous and easy to disintegrate
[0006] In the technical solution disclosed in the patent document CN200810099402.6, sodium carbonate aqueous solution or phosphoric acid aqueous solution is used for soaking modification, and the sodium salt and acidic aqueous solution are added to the modification environment at one time. As the reaction progresses, the attapulgite The modification efficiency has decreased, especially when the modification operation is coming to an end, the modification becomes slower and incomplete, and because there is no corresponding purification treatment before the modification, it also affects its modification from another angle. effect, the overall modification effect is greatly reduced

Method used

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  • Modification method of attapulgite
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  • Modification method of attapulgite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A, the purification of attapulgite, take attapulgite 1kg and pulverize, be pulverized to particle size and be 2 orders, the attapulgite after pulverizing is added in the clear water of 10kg, stir evenly, after soaking for 10 hours, centrifuge for 10min, The rotational speed of the centrifuge is 1500r / min, and after the centrifugation, the upper suspension is filtered and dried to obtain the primary product of attapulgite;

[0024] B, the modification of attapulgite, utilize sodium carbonate configuration concentration to be the sodium carbonate solution of 2.5%, put the preliminary product of described attapulgite into sodium carbonate solution, and stir and heat, described stirring speed The heating temperature is 60r / min, and the heating temperature is maintained at 60-85°C; during the stirring process, sodium bicarbonate and sodium hydroxide particles are added while stirring, and the sodium bicarbonate and sodium hydroxide particles added to the sodium carbonate solu...

Embodiment 2

[0030]A, the purification of attapulgite, get attapulgite 1kg and pulverize, be pulverized to particle size and be 16 orders, the attapulgite after pulverizing is added in the clear water of 15kg, stir well, after soaking for 15 hours, centrifuge for 25min, the The rotating speed of described centrifugal is 1800r / min, obtains the initial product of attapulgite through steps such as drying after centrifugal;

[0031] B, the modification of attapulgite, utilize sodium carbonate configuration concentration to be 1L of sodium carbonate solution of 4.0%, put the preliminary product of described attapulgite into sodium carbonate solution, and stir and heat, described stirring The speed is 300r / min, and the heating temperature is maintained at 60-85°C; during the stirring process, sodium bicarbonate and sodium hydroxide particles are added while stirring, and the sodium bicarbonate added to the sodium carbonate solution The quality of sodium hydroxide and sodium hydroxide all account...

Embodiment 3

[0037] The difference from Example 2 is that in the step A, the attapulgite is crushed until the particle size is 5 mesh, and the centrifugation time of the step A is controlled to 10 minutes. It has been determined that compared with other attapulgite sodium salts and acidification modification methods, this example has a great breakthrough in modification degree and other aspects, as shown in the following table:

[0038]

[0039] That is to say, the viscosity of the attapulgite treated in this example is 20-25% higher than the viscosity of the attapulgite treated with clear water for 24 hours, and 10-15% higher than the viscosity of the attapulgite treated with acidification alone; the attapulgite treated in this example The specific surface area of ​​attapulgite is 3 to 5 times higher than that of attapulgite soaked in water for 24 hours. This is also a breakthrough in the purification of attapulgite. The overall modification degree of attapulgite in this example is bett...

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Abstract

The invention relates to a modification method of attapulgite, in particular relates to a modification method of the attapulgite by utilizing the steps of purifying the attapulgite, modifying the attapulgite, treating the attapulgite and the like. In the attapulgite purification step, operations such as smashing, soaking, centrifuging and the like are fully combined; and the purity of the purified attapulgite is greatly improved through specific steps and selection of parameters such as smashing degree, soaking time, centrifugation rotation speed and the like, and the times required by the purification and modification of the attapulgite are significantly shortened, so as to provide a good basis for subsequent modification, thus the purification step has a high industrial value. Stirring and heating operations are set along with the proceeding of modification, sodium bicarbonate and sodium hydroxide particles are added while stirring in the stirring process, and the modification vitality of the attapulgite is improved by utilizing a chemical reaction theory so that the attapulgite is thoroughly modified, and the modified attapulgite has a strong adhesion property and is not easy to disintegrate.

Description

technical field [0001] The invention relates to a method for modifying non-metallic ore, in particular to a method for modifying attapulgite. Background technique [0002] Attapulgite refers to a clay mineral with attapulgite as the main component. Attapulgite is a crystalline hydrated magnesium aluminum silicate mineral with unique layer chain structure characteristics and nanoscale pores. The microscopic structure of the channel has the characteristics of a large specific surface area and a well-developed mesoporous material, which is an ideal structural material. In actual use, using attapulgite as a structural material often requires modification of attapulgite. However, due to the shortcomings of uneven purity and weak adhesion, the modification effect of attapulgite is not ideal. [0003] Chinese patents disclose a variety of structural materials with attapulgite as the coating, but in the prior art, attapulgite is often affected due to reasons such as unscientific pu...

Claims

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Application Information

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IPC IPC(8): C01B33/40
Inventor 刘伟生张国林
Owner LANZHOU UNIVERSITY
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