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Method for organic surface modification of nanometer attapulgite

An inorganic surface modification and surface modification technology, which is applied to the organic surface modification of nano attapulgite, and uses anionic surfactants to organically modify the surface of nano attapulgite, which can solve the problem of high energy consumption and separation efficiency in centrifugal separation. Low, low filtration speed and other issues, to achieve the effect of low cost, good dispersion, increased distance

Inactive Publication Date: 2016-01-06
蒋寿悟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fine particles of attapulgite, there will be the following problems when performing solid-liquid separation: If filter cake is used for filtration, due to the compressibility of filter cake, with the formation of dense filter cake layer, the pressure difference required for filtration will increase sharply, Filtration speed is getting smaller and smaller
High energy consumption, low separation efficiency and serious product loss caused by centrifugal separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add natural attapulgite minerals into deionized water dissolved with 4% sodium pyrophosphate (mass ratio to attapulgite) to prepare a suspension containing attapulgite 80g / L, disperse at high speed for 2 hours with an emulsifier, and let stand for 100 hours. Adjust the pH value of the obtained nano-attapulgite aqueous dispersion to 9.5, raise the temperature to 40 ° C, and add 0.3 mol L dropwise to the nano-attapulgite aqueous dispersion while stirring. -1 Zinc sulfate aqueous solution and 0.6mol·L -1 dilute ammonia water, maintain the reaction temperature at 40°C, pH = 9.0-10.0, and add zinc sulfate accounting for 5% of the attapulgite mass (calculated as ZnO) dropwise within 2 hours. After dropping, adjust the pH to 4.5 with dilute sulfuric acid, and ripen for 0.5h. In the state of stirring, add sodium laurate accounting for 3% of the mass of the attapulgite, and continue stirring for 5 minutes after adding. Solid-liquid separation, washing, drying the washed nano-a...

Embodiment 2

[0018] Embodiment 2: the natural attapulgite mineral is added into the deionized water that is dissolved with 4% sodium pyrophosphate (mass ratio with attapulgite), is mixed with the suspension that contains attapulgite 80g / L, disperses 2h at a high speed with emulsifier, static Set to 100h. Adjust the pH value of the obtained nano-attapulgite aqueous dispersion to 9.5, raise the temperature to 100 ° C, and add 0.3 mol L dropwise to the nano-attapulgite aqueous dispersion while stirring. -1 Zinc sulfate aqueous solution and 0.6mol·L -1 dilute ammonia water, maintain the reaction temperature at 100°C, pH = 9.0-10.0, and add zinc sulfate accounting for 30% of the attapulgite mass (calculated as ZnO) dropwise within 4 hours. After dropping, adjust the pH to 4.5 with dilute sulfuric acid, and ripen for 0.5h. In the state of stirring, add sodium laurate accounting for 20% of the mass of the attapulgite, and continue stirring for 10 hours after adding. Solid-liquid separation, wa...

Embodiment 3

[0020] Add natural attapulgite minerals into deionized water dissolved with 3% sodium polypropionate (mass ratio to attapulgite) to prepare a suspension containing attapulgite 60g / L, ultrasonically disperse for 2h with an ultrasonic disperser, and let stand for 24h. Adjust the pH value of the obtained nano-attapulgite aqueous dispersion to 9.5, raise the temperature to 70 ° C, and add 0.6 mol L dropwise to the nano-attapulgite aqueous dispersion while stirring. -1 Aqueous solution of sodium aluminate and 0.6mol·L -1 dilute sulfuric acid, maintain the reaction temperature at 70°C, pH = 9.0-10.0, and add 10% of the attapulgite mass (as Al 2 o 3 meter) of sodium aluminate. After dropping, adjust the pH to 5.0 with dilute sulfuric acid, and ripen for 0.5h. In the state of stirring, potassium stearate accounting for 8% of the mass of the attapulgite was added, and after the addition was completed, the stirring was continued for 5 hours. After solid-liquid separation and washing...

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Abstract

The invention provides a method for organic surface modification of nanometer attapulgite. The method comprises the following steps: (1) inorganic surface modification of nanometer attapulgite: a step of heating dispersed and purified nanometer attapulgite aqueous dispersion to 40 to 100 DEG C and carrying out inorganic surface modification on nanometer attapulgite under stirring, wherein a surface coating substance of nanometer attapulgite is one, two or three selected from the group consisting of ZnO hydrate, Al2O3 hydrate and MgO hydrate, and in terms of oxide, a mass ratio of the inorganic coating substance to nanometer attapulgite is 5 to 30%; (2) organic surface modification of nanometer attapulgite: a step of the pH value of the inorganic surface coated nanometer attapulgite aqueous dispersion so as to allow the surface of nanometer attapulgite to be positively charged, then adding desired anionic surfactant under stirring, wherein a mass ratio of the anionic surfactant to nanometer attapulgite is 3% to 20% and the anionic surfactant is added after dissolving in deionized water, and continuing stirring for 5 to 600 min after completion of addition; and (3) post-treatment: a step of subjecting a product to solid-liquid separation, washing, drying and crushing after completion of a reaction so as to eventually obtain the anionic surfactant surface modified nanometer attapulgite.

Description

technical field [0001] The invention relates to a method for organic surface modification of nanometer attapulgite, in particular to a method for organically modifying the surface of nanometer attapulgite by using an anionic surfactant. The surface-modified nano-attapulgite has good compatibility and dispersion in organic systems. It belongs to the field of deep processing of non-metallic ore. Background technique [0002] Attapulgite is a natural silicate mineral whose typical chemical formula is Si 8 o 20 Mg 5 (OH) 2 4H 2 O. The microstructure of attapulgite is composed of three levels. First, its basic structural unit is rod crystal, which is fibrous, 0.5-2 μm long, and 0.01-0.02 μm in diameter, which belongs to one-dimensional nanomaterials. The second is that the rod crystals are tightly gathered in parallel to form a rod crystal bundle. The third is that various aggregates are formed by the mutual aggregation of crystal beams. The surface of nano attapulgite is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/06C09C3/08C09C3/10
Inventor 蒋寿悟
Owner 蒋寿悟
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