Method for preparing decoloring material of dyeing waste water by attapulgite ore

A technology for printing and dyeing wastewater and attapulgite, which is applied in separation methods, chemical instruments and methods, and textile industry wastewater treatment, etc., can solve the problems of low mechanical strength and blister strength of granular materials, high equipment corrosion, and poor recyclability. Excellent decolorization performance, eliminate pollution, reduce the effect of production

Inactive Publication Date: 2009-08-26
SICHUAN UNIV
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  • Abstract
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Problems solved by technology

However, there are disadvantages such as low mechanical strength and water bubble strength of pellets, poor recyclability after thermal regeneration, and high corrosion of Cl to equipment during heat treatment.
[0008] The above reports mentioned different methods of using attapulgite minerals as raw materials to prepare printing and dyeing wastewater decolorization materials. , drying, calcining to make granular decolorized materials, and the manufacturing process that can be reused many times after granulation without any additives and soaked in ammonium sulfate solution and has basically no pollutant emissions in the manufacturing process has not been reported yet.

Method used

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  • Method for preparing decoloring material of dyeing waste water by attapulgite ore

Examples

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Effect test

example 1

[0021] Attapulgite clay 100kg, 80 mesh, and H concentration of 1.5mol / L 2 SO 4 The solid-liquid ratio is 1:2.5 mixed, activated at room temperature for 2h, and then neutralized with 5mol / L NaOH to a pH of about 7.5, a solid-liquid separation, granulation into 3~5mm granules, drying at 90℃, and then After calcination at 700°C for 1 hour, 85kg of decolorizing material for printing and dyeing wastewater can be obtained. Evaporate and concentrate the filtrate and crystallize to obtain Na 2 SO 4 ·10H 2 O by-product is about 70kg, and the mother liquor is recycled.

[0022] The decolorizing material after decolorization is soaked in a 5mol / L ammonium sulfate solution for 3 minutes and then calcined at 300°C for 5 minutes, which can be reused. The particle strength of the decolorizing material and its decolorizing effect on single pure dyes with different properties and actual printing and dyeing wastewater are shown in Table 1.

example 2

[0024] Attapulgite clay 100kg, 80 mesh, and H concentration of 2.0mol / L 2 SO 4 Mix with solid-liquid ratio of 1:2.0, activate at room temperature for 2h, then neutralize to pH 7.5 with 5mol / L NaOH, separate solid-liquid once, granulate into 3~5mm pellets, dry at 90℃, and then After calcination at 700°C for 1 hour, 90kg of decolorizing material for printing and dyeing wastewater can be obtained. Evaporate and concentrate the filtrate and crystallize to obtain Na 2 SO 4 ·10H 2 O by-product is about 70kg, and the mother liquor is recycled.

[0025]The decolorizing material after decolorization is soaked in a 3mol / L ammonium sulfate solution for 3 minutes and then calcined at 300°C for 5 minutes, which can be reused. The particle strength of the decolorizing material and its decolorizing effect on single pure dyes with different properties and actual printing and dyeing wastewater are shown in Table 1.

example 3

[0027] Attapulgite clay 100kg, 100 mesh, and H concentration of 1.5mol / L 2 SO 4 Use a solid-liquid ratio of 1:2.0 to mix, activate at room temperature for 1.5h and add 5kg of ferrous sulfate, and then neutralize with 5mol / L NaOH to a pH of about 7.5, a solid-liquid separation, and granulate into 3~5mm pellets. After drying at 90°C and calcining at 700°C for 1 hour, 90kg of decolorizing material for printing and dyeing wastewater can be obtained. Evaporate and concentrate the filtrate and crystallize and separate the produced filtrate to obtain Na 2 SO 4 ·10H 2 The O by-product is about 80kg, and the mother liquor is recycled.

[0028] The decolorizing material after decolorization is soaked in a 2mol / L ammonium sulfate solution for 3 minutes and then calcined at 300°C for 5 minutes, which can be reused. The particle strength of the decolorizing material and its decolorizing effect on single pure dyes with different properties and actual printing and dyeing wastewater are shown in ...

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Abstract

A method for producing printing and dyeing wastewater decolorization materials from attapulgite minerals, which is based on attapulgite clay (80-100 mesh), and 1.5-3.0mol / LH2SO4, solid-liquid ratio 1: (2-3), Activate at room temperature for 1-2 hours, add 0-5% Mg2+, Fe3+, Mn2+, Ti4+ metal sulfate (calculated as metal oxide), and then pass through 3-6mol / L NaOH, Na2CO3 or NH3·H2O alkaline solution Neutralize to pH 7-8, separate solid-liquid once, granulate (3-5mm), dry, and then calcined at 700°C for 0.5-2h. Na2SO4·10H2O or (NH4)2SO4 is recovered as a by-product of the filtrate produced; after the decolorizing material decolorizes printing and dyeing wastewater, the granular material is soaked in 1.5-6.0mol / L ammonium sulfate solution for 2-5min, and baked at 300°C for 5-5min. After 25 minutes, it can be reused more than four times; the decolorization rate of the decolorization material to printing and dyeing wastewater is ≥94%, and the decolorization rate of recycling is ≥91%. It has the characteristics of simple manufacturing process, low cost, and no pollutant discharge.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a decolorizing material for printing and dyeing wastewater made from attapulgite mineral raw materials, in particular to a reusable printing and dyeing wastewater decolorizing material prepared by acid activation, alkali compounding multiple metal ions, and regeneration activation methods. Background technique [0002] Printing and dyeing wastewater is one of the extremely difficult industrial wastewaters. Its existence not only affects the sustainable development of textile printing and dyeing industry, but also poses a threat to the living environment of human beings to a certain extent. It is imperative to solve the pollution problem of printing and dyeing wastewater. Research and development of new and efficient decolorizing materials for printing and dyeing wastewater is one of the effective ways to solve this problem. Among them, the use of clay minerals such as a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01J20/30C02F1/28C02F1/52B01D15/00C02F103/30
Inventor 姚亚东尹光福郭向利卓浪罗勇康云清贺异昱张磊梁莹
Owner SICHUAN UNIV
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