Spongy bentonite-based composite adsorbing material and preparation method thereof

A composite adsorption material and a technology of bentonite are applied in the field of sponge-like bentonite-based composite adsorption materials and their preparation, which can solve the problems of low adsorption rate, low pore connectivity, small pores, etc., and achieve improved performance, adsorption capacity and adsorption. Effects of velocity, enlarged pore size, and degree of connectivity

Active Publication Date: 2011-04-06
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a sponge-like bentonite-based composite adsorption material and its preparation method, which mainly solves the problem that bentonite is difficult to separate from solid and liquid in water and waste water treatment and uses bentonite and plastic composite extrusion granulation products to be compact and have small pores , the problem of low pore connectivity and low adsorption rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 70wt% of natural bentonite, then add 30wt% of thermoplastic polymer polyethylene, and stir for 30 minutes. Then add the mixed sample into the feeding funnel of the twin-screw plastic extruder, and wait until each section of the twin-screw plastic extruder reaches the set conveying section 190°C, the plasticizing section 200°C, and the melting section 210°C. Compress the heating temperature of 220°C in the extrusion section, start the main engine to extrude, and obtain a thin strip product, which directly enters the water tank for cooling and cutting, and finally obtains a short columnar adsorbent.

[0017] Soak the short columnar adsorbent in 25°C water for 10 minutes, take it out and put it into the puffing equipment, cover the sealing cover, heat and rotate the puffing tank to make it heat up rapidly, when the pressure in the tank reaches 0.5MPa, stop Heating and opening the machine cover to obtain the sponge-like bentonite-based composite adsorption material.

...

Embodiment 2

[0020] Take 70wt% of natural bentonite, then add 30wt% of thermoplastic polymer polyethylene, and stir for 30 minutes. Then put the mixed sample into the feeding hopper of the twin-screw plastic extruder, and wait until each section of the twin-screw plastic extruder reaches the set heating temperature, that is, the conveying section is 190°C, the plasticizing section is 200°C, and melted Section 210 ° C, compression extrusion section 220 ° C, start the main engine to extrude, and obtain a thin strip product, which directly enters the water tank for cooling and cutting, and finally obtains a short columnar adsorbent.

[0021] Soak the short columnar adsorbent in 25°C water for 12 minutes, take it out and put it into the puffing equipment, cover the sealing cover, heat and rotate the puffing tank to make it heat up rapidly, when the pressure inside the tank reaches 0.8MPa, stop Heating and opening the machine cover to obtain the sponge-like bentonite-based composite adsorption ...

Embodiment 3

[0024] Take 60wt% of natural bentonite, add 10wt% of auxiliary selective adsorption raw materials, stir for 15 minutes, add 25wt% of thermoplastic polymer polypropylene and 5wt% of polyethylene, and stir for 15 minutes. Then put the mixed sample into the feeding hopper of the twin-screw plastic extruder, and wait until each section of the twin-screw plastic extruder reaches the set heating temperature, that is, the conveying section is 190°C, the plasticizing section is 200°C, and melted Section 210°C, compression extrusion section 220°C, start the main engine to extrude to obtain a thin strip product, put the obtained thin strip product in a water tank to cool, cut, and finally obtain a short columnar adsorbent.

[0025] Soak the short columnar adsorbent in water at 25°C for 16 minutes, take it out and put it into the puffing equipment, cover the sealing cover, heat and rotate the puffing tank to make it heat up rapidly, when the pressure in the tank reaches 1MPa, stop adding ...

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Abstract

The invention discloses a spongy bentonite-based composite adsorbing material and a preparation method thereof. The composite adsorbing material is prepared by the following steps of: proportioning, mixing and plasticizing extruding to obtain strip-shaped bentonite-based composite material extrudate with diameter of between 2 and 5mm; introducing the extrudate into water of room temperature and cooling; meanwhile, cutting the strip-shaped product into short columnar or strip-shaped products by using a shear; placing the products in water at the temperature of between 25 and 100 DEG C and soaking for 5 to 20 minutes so that the material absorbs water to be wetted; and placing in a tank of an air flow expanding machine, turning and heating the tank, opening a material port of the tank when the air pressure in the tank reaches 0.5 to 1.0MPa and releasing the air in the tank to obtain the composite adsorbing material. By using the material and the method, the pore size and the communication degree of granulated products compositely extruded from the bentonite and plastic are expanded, so that the adsorption capacity and the adsorption rate of the granulated products are obviously improved. The product of the invention is suitable for heavy metal ion-containing waste water treatment.

Description

1. Technical field [0001] The invention relates to an adsorbent for treating water and waste water, in particular to a sponge-like bentonite-based composite adsorption material and a preparation method thereof. 2. Background technology [0002] Bentonite is a clay rock mainly composed of montmorillonite, which has natural adsorption and cation exchange properties, and can be used as an adsorption material for water and wastewater treatment. However, due to the clay mineral properties of bentonite, the particles are fine, and it is easy to disperse and slurry when used in a water environment to form a suspension, resulting in difficulty in solid-liquid separation, and it is difficult to recycle, which affects the practical application of bentonite in water and wastewater treatment. . In order to solve this problem, Ma Shaojian and others prepared a plastic skeleton type bentonite composite adsorbent in the laboratory (Patent No. 200710035221.2). This patented technology use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28
Inventor 马少健莫伟唐丽群苏秀娟廖芳艳林美群杨金林胡治流王桂芳杨梅金
Owner GUANGXI UNIV
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