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Integrated continuous production type clay dissociation-modification-drying method

A production method and clay technology, applied in the field of clay dissociation, can solve the problems of high cost, high energy consumption, and non-environmental protection, and achieve the effect of low cost, low energy consumption, and easy control of the process

Inactive Publication Date: 2017-02-22
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a simple, efficient and low-cost continuous production clay dissociation-modification-drying integrated method, on the basis of maintaining the original shape of the clay structural unit, to realize clay micro-nano to overcome the shortcomings of existing technologies such as high energy consumption, high cost, low efficiency, and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Follow the steps below to connect and produce modified micro-nano attapulgite powder

[0022] (1) Clay pretreatment: fully mix and soak 100 mesh attapulgite with isopropanol; among them, isopropanol is twice the mass of attapulgite;

[0023] (2) Extrusion treatment: choose an intermeshing co-rotating twin-screw extruder, adjust the length-to-diameter ratio of the twin-screw to 1:32, and control the extrusion temperature to 50°C; Active agent - quaternary ammonium salt is added at a uniform speed, mixed and extruded;

[0024] (3) Drying: Heat and dry the extruded attapulgite at 80°C to remove the solvent, and at the same time recycle and reuse the used isopropanol to obtain cetyltrimethylammonium bromide ammonium bromide in a soft agglomerated state. Sexual micro-nano attapulgite powder.

Embodiment 2

[0025] Embodiment 2: Follow the steps below to connect and produce modified micro-nano attapulgite powder

[0026] (1) Clay pretreatment: fully soak 60-mesh sepiolite in water for 2 hours, and the amount of water used is twice the mass of sepiolite;

[0027] (2) Extrusion treatment: Select an intermeshing co-rotating twin-screw extruder, adjust the length-to-diameter ratio of the twin-screws to 1:46, control the extrusion temperature to 125°C, and replace the pretreated sepiolite with 3% of its mass Sexual agent - silane coupling agent is added at a uniform speed and mixed and extruded;

[0028] (3) Drying: The extruded sepiolite is heated, dried and dehydrated at 120°C to obtain micro-nano sepiolite clay powder in a soft agglomerated state.

Embodiment 3

[0029] Embodiment 3: Follow the steps below to connect and produce modified micro-nano attapulgite powder

[0030] (1) Clay pretreatment: fully soak 200-mesh dolomite-type attapulgite in N,N-dimethylformamide, the amount of which is 3 times the mass of clay;

[0031] (2) Extrusion treatment: choose an intermeshing co-rotating twin-screw extruder, adjust the length-to-diameter ratio of the twin-screw to 1:60, and control the extrusion temperature to 200°C; Modifier - stearic acid is added at a uniform speed and mixed for extrusion;

[0032] (3) Drying: heat and dry the extruded dolomite-type attapulgite at 160°C to remove the solvent, and then obtain the modified micronanoized dolomite-type attapulgite powder in a soft agglomerated state. -Dimethylformamide is recycled for reuse.

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PUM

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Abstract

The invention discloses an integrated continuous production type clay dissociation-modification-drying method. The method comprises the following steps: fully mixing and soaking clay in a dispersion solvent; uniformly adding the pretreated clay and a modifier in a meshed co-rotating twin screw extruder, adjusting the extrusion parameter, and utilizing strong shearing force of the meshed co-rotating twin screw extruder at a meshed position to loosen and tear clay aggregate; and further drying the extruded clay to obtain micro-nano clay powder in the soft gathering state, and recycling the solvent at the same time. According to the invention, the strong shearing force of the meshed co-rotating twin screw extruder at the meshed position is utilized to loosen and tear the clay aggregate, so that the requirements for equipment are low, the process is easy to control, environmental friendliness is realized, the energy consumption and the cost are low, and large-scale continuous environmental-friendly production can be realized.

Description

technical field [0001] The invention relates to a clay dissociation method, in particular to an integrated clay dissociation-modification-drying method capable of continuous production. Background technique [0002] Clay is a natural micro-nano material, and the structural units mainly form dense aggregates through hydrogen bonds and physical forces. In recent years, from the traditional purely dry or wet dissociated clay, a new process of dissociated clay that combines dry and wet processes has gradually been developed, such as extrusion-freezing-thawing, freezing-milling and roller extrusion- Dry-wet combination technology such as high-pressure homogenization can better dissociate clay and realize the micro-nanoization of clay. However, processes such as freeze-thawing and high-pressure homogenization still have defects such as high energy consumption and secondary agglomeration, and the amount of wastewater is large, or a large amount of organic solvents are required, ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28C1/18B28C1/10
CPCB28C1/182B28C1/10
Inventor 陈静蔡鹏金叶玲倪伶俐蒋金龙丁师杰
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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