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Method for preparing decolorizing material for printing and dyeing wastewater

A printing and dyeing wastewater and decolorization technology, which is applied in chemical instruments and methods, textile industry wastewater treatment, water/sewage treatment, etc., can solve the problems of low particle mechanical strength and blister strength, and achieve improved decolorization performance, increased specific surface area, and improved The effect of decolorization adsorption performance

Inactive Publication Date: 2017-05-31
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding rice husks in this process increases the porosity of the granular material, but the mechanical strength and blister strength of the grains are low, and it also faces the problem of a large amount of acid treatment after acid-activated water washing

Method used

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  • Method for preparing decolorizing material for printing and dyeing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Attapulgite 500g, 80 mesh, mixed with urea and sodium hexametaphosphate solution with a concentration of 10wt%, wherein the volume ratio of attapulgite to urea is 1:0.5, and the addition of sodium hexametaphosphate is 1 / 2 of the attapulgite quality 10%. After activation at normal temperature for 2 hours, granulate (3-5mm) through a granulator, and after drying at 70°C, slowly raise the temperature to 400°C for heat treatment for 2 hours, and the heating rate of heat treatment is 1.2°C / min; remove the organic components, The attapulgite porous printing and dyeing wastewater decolorization material is obtained.

Embodiment 2

[0029] Attapulgite 500g, 80 mesh, mixed with urea and sodium hexametaphosphate solution with a concentration of 10wt%, wherein the volume ratio of attapulgite to urea is 1:0.6, and the addition of sodium hexametaphosphate is 1 / 2 of the attapulgite quality 10%. After activation at normal temperature for 1 hour, granulate (3-5mm) through a granulator, and after drying at 60°C, slowly heat up to 380°C for 4 hours and heat treatment at a rate of 1.0°C / min; remove the organic components, The attapulgite porous printing and dyeing wastewater decolorization material is obtained.

Embodiment 3

[0031] Attapulgite 500g, 80 mesh, mixed with urea and sodium hexametaphosphate solution with a concentration of 10wt%, wherein the volume ratio of attapulgite to urea is 1:0.7, and the addition of sodium hexametaphosphate is 1 / 2 of the attapulgite quality 10%. After activation at normal temperature for 3 hours, granulate (3-5mm) through a granulator, and after drying at 80°C, slowly raise the temperature to 390°C for heat treatment for 3 hours, and the heating rate of heat treatment is 0.8°C / min; remove the organic components, The attapulgite porous printing and dyeing wastewater decolorization material is obtained.

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Abstract

The invention provides a method for preparing a decolorizing material for printing and dyeing wastewater. The method comprises the following steps: (1) preparing urea and a binder into an aqueous solution, and then performing ball-milling on the aqueous solution together with attapulgite for 10-25 minutes (preferably 20 minutes) for thorough mixing, and activating at a normal temperature for 1-3 hours; (2) carrying out granulating using a disk granulating machine, and preferably controlling a grain size to a range of 3-5 mm; (3) drying the obtained granules under a condition of a temperature ranging from 60 to 80 DEG C around; and (4) increasing the temperature to a range of 380-400 DEGC C for heat treatment for 2-4 hours. The method avoids complex acid activation and the problem of treatment of a large amount of acid produced after water washing. The obtained attapulgite porous granular decolorizing material is rough and hard in surface, large in specific surface area, high in porosity, good in adsorption decolorization performance, and prone to solid-liquid separation, and can be activated and regenerated; moreover, the material has excellent mechanical strength and water soaking strength.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for preparing attapulgite porous particles used for decolorization of printing and dyeing wastewater, in particular to preparing porous particles for decolorization of printing and dyeing wastewater that can be used repeatedly by composite activation and porous structure construction. Background technique [0002] Printing and dyeing wastewater is composed of materials lost in pretreatment, dyeing, printing, finishing and other processing and production processes of textile products such as cotton, wool, and chemical fiber, as well as sewage from washing the ground. It is the main colored wastewater generated in industrial production. According to incomplete statistics, the national discharge of printing and dyeing wastewater is 3-4 million tons per day. Because printing and dyeing wastewater has complex components, large chroma, and contains a large amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/28B01J20/30C02F1/28C02F103/30
CPCB01J20/16B01J20/28011C02F1/281C02F2103/30
Inventor 刘斌姚义俊沈国柱饶伟锋陈卓赵俊杰陈顺江张诗雨张旭良
Owner NANJING UNIV OF INFORMATION SCI & TECH
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