Porous attapulgite adsorbent for printing and dyeing wastewater treatment and preparation method thereof

A technology of attapulgite and printing and dyeing wastewater, which is applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., and can solve the difficulty of solid-liquid separation, inability to separate sludge, and difficulty in solid-liquid separation and other problems, to achieve excellent adsorption and decolorization performance, simple and feasible treatment method, and to improve the effect of adsorption and decolorization efficiency

Inactive Publication Date: 2017-06-13
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses certain features from talcum clay (Talcan) to improve its properties such as absorbency, capacity, durability against abrasion or impact damage during processing. It does this through forming tiny holes within the materials called pits, increasing their size while maintaining good mechanical integrity. Calibration processes before firing help create strong structures without any defects like cracks. Additionally, calcium hydroxide activated charcoals have been used successfully to remove colorants from printed and dyed paper products due to their superior affinity towards magnetic particles attached thereon. These techniques allow for efficient removal of colored substances from these items even when they remain wet over long periods of storage.

Problems solved by technology

This patent describes different ways for modifying existing absorbents by adding certain metabolites or reducing their negative effects towards aquatic environments. These modifications can lead to improved performance but may increase manufacturing costs while minimizing potential risks associated with these processes.

Method used

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  • Porous attapulgite adsorbent for printing and dyeing wastewater treatment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 60 grams of attapulgite (100 mesh), 40 grams of β-type hemihydrate gypsum, 5 grams of sodium hexametaphosphate, 10 milliliters of hydrogen peroxide, manganese oxide MnO 2 and iron oxide Fe 2 o 3 A mixture of 0.1 g and 250 ml of water.

[0027] (1) sodium hexametaphosphate is added in water, fully dissolved, obtains uniform solution;

[0028] (2) Add attapulgite, β-type hemihydrate gypsum and manganese oxide MnO 2 with iron oxide Fe 2 o 3 mixture, stir well;

[0029] (3) Add hydrogen peroxide, stir evenly, pour the slurry into the mould, and let stand for 12 hours;

[0030] (4) The slurry and the mold are placed together in a 50°C oven for drying, demoulding, and the green body after demoulding continues to dry at this temperature;

[0031] (5) Put the dried green body into a muffle furnace for roasting, raise the temperature to 400°C at 10°C / min and keep it for 4 hours, then cool to obtain the required porous attapulgite adsorbent.

Embodiment 2

[0033] Weigh 65 grams of attapulgite (100 mesh), 35 grams of desulfurized gypsum, 5 grams of water glass, 25 milliliters of hydrogen peroxide, manganese oxide MnO 2 and chromium oxide Cr 2 o 3 A mixture of 0.5 g and 300 ml of water.

[0034] (1) Water glass is added in water, fully dissolved, obtains uniform solution;

[0035] (2) Add attapulgite, desulfurized gypsum and manganese oxide MnO 2 with chromium oxide Cr 2 o 3 mixture, stir well;

[0036] (3) Add hydrogen peroxide, stir evenly, pour the slurry into the mould, and let stand for 12 hours;

[0037] (4) The slurry and the mold are placed together in a 50°C oven for drying, demoulding, and the green body after demoulding continues to dry at this temperature;

[0038] (5) Put the dried body into a muffle furnace for roasting, raise the temperature at 10°C / min to 450°C and keep it for 3.5 hours, then cool to obtain the required porous attapulgite adsorbent.

Embodiment 3

[0040] Weigh 70 grams of attapulgite (80 mesh), 30 grams of a mixture of β-type hemihydrate gypsum and desulfurized gypsum, 5 grams of sodium hexametaphosphate, 10 milliliters of hydrogen peroxide, manganese oxide MnO 2 , chromium oxide Cr 2 o 3 and iron oxide Fe 2 o 3 A mixture of 0.1 g and 350 ml of water.

[0041] (1) sodium hexametaphosphate is added in water, fully dissolved, obtains uniform solution;

[0042] (2) Add attapulgite, a mixture of β-type hemihydrate gypsum and desulfurized gypsum, manganese oxide MnO 2 , chromium oxide Cr 2 o 3 and iron oxide Fe 2 o 3mixture, stir well;

[0043] (3) Add hydrogen peroxide, stir evenly, pour the slurry into the mould, and let stand for 12 hours;

[0044] (4) The slurry and the mold are placed together in a 60°C oven for drying, demoulding, and the green body after demoulding continues to dry at this temperature;

[0045] (5) Put the dried green body into a muffle furnace for roasting, raise the temperature to 500°C a...

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Abstract

The invention relates to a porous attapulgite adsorbent for printing and dyeing wastewater treatment and a preparation method thereof. The adsorbent is prepared from main raw materials including attapulgite and gypsum, and auxiliary raw materials including a binder, a foaming agent, a foaming catalyst and water. The mineral characteristics of the attapulgite are utilized, it is ensured that the adsorbent has the good physical adsorption performance, foaming technology forming is adopted, a large number of pores with the diameter being 0.1-1 mm are formed in the materials, the porosity is about 60-80%, the specific area of the attapulgite adsorbent is greatly increased, and the adsorption decoloration efficiency of the materials is improved. The attapulgite adsorbent is a bulk material, the purpose of solid-liquid separation of printing and dyeing wastewater treatment follow-up stages is achieved, and recycling of some dyes becomes possible. The adsorbent regeneration repeatability treatment method is simple and easy to implement, and repeated treatment can be performed.

Description

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Claims

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Application Information

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Owner NANJING UNIV OF INFORMATION SCI & TECH
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