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Granular red mud absorbent and preparation method thereof

A technology of adsorbent and red mud, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of complex operation, high cost, and high energy consumption in manufacturing, and achieve strong desorption and regeneration capabilities, Good strength, good adsorption performance

Inactive Publication Date: 2012-07-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it needs to be heated under several temperature gradients and roasted at high temperature, which makes its production energy-consuming, high-cost and complicated to operate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The specific preparation steps of the granular red mud adsorbent in this embodiment include the following:

[0030] (1) Granulation: Take red mud with a water content of 30wt% and a pH of 13, mix it with cement dry base directly and granulate it, and spray atomized water during the granulation process to keep the particle surface moist; (red mud dry base and cement The mass ratio of the dry basis is: 30:1. The main component of the red mud dry basis is SiO 2 , CaO, Fe 2 o 3 、Al 2 o 3 and Na 2 O mixture in any proportion. )

[0031] (2) Curing: Cover the red mud particles prepared in step (1) with a wet cloth, spray water mist to keep them wet for 3 days, and then condense into granular red mud adsorbent.

[0032] Both the granulation and curing process of the red mud adsorbent need to keep its water content at 20wt%.

[0033] The main components of the granular red mud adsorbent prepared in this example are: red mud dry basis 60wt%, cement dry basis 2wt%, water ...

Embodiment 2

[0038] The specific preparation steps of the granular red mud adsorbent in this embodiment include the following:

[0039] (1) Granulation: Take red mud with a water content of 35wt% and a pH of 14, mix it with cement dry base directly and granulate it, and spray atomized water during the granulation process to keep the particle surface moist; (red mud dry base and cement The mass ratio of dry basis is: 35:4). The main component of red mud dry base is SiO 2 , CaO, Fe 2 o 3 、Al2 o 3 and Na 2 O mixture in any proportion. )

[0040] (2) Conservation: Cover the red mud particles prepared in step (1) with a wet cloth, spray water mist to keep them wet for 8 days, and then condense into granular red mud adsorbent.

[0041] The granulation and curing process of the red mud adsorbent need to keep its water content at 20-30wt%.

[0042] The main components of the granular red mud adsorbent prepared in this example are: red mud dry basis 70wt%, cement dry basis 8wt%, water 21wt%...

Embodiment 3

[0048] The specific preparation steps of the granular red mud adsorbent in this embodiment include the following:

[0049] (1) Granulation: Take red mud with a water content of 40wt% and a pH of 15, mix it with cement dry base directly and granulate it, and spray atomized water during the granulation process to keep the particle surface moist; (red mud dry base and cement The mass ratio of the dry basis is: 32.5:5. The main component of the red mud dry basis is SiO 2 , CaO, Fe 2 o 3 、Al 2 o 3 and Na 2 O mixture in any proportion. )

[0050] (2) Curing: Cover the red mud particles prepared in step (1) with a wet cloth, spray water mist to keep them wet for 10 days, and then condense into granular red mud adsorbent.

[0051] Both the granulation and curing process of the red mud adsorbent need to keep its water content at 23wt%.

[0052] The main components of the granular red mud adsorbent prepared in this example are: red mud dry basis 65wt%, cement dry basis 10wt%, wa...

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Abstract

The invention discloses a granular red mud absorbent used for processing a large quantity of low-concentration organic wastewater and heavy metal wastewater and a preparation method of the granular red mud absorbent, belonging to the technical field of environmental protection and water treatment. The prepared granular red mud absorbent comprises the following ingredients by weight: 60-70wt% of red mud dry basis, 2-10wt% of cement dry basis and 20-30wt% of water, the particle size range of the granular red mud absorbent is 0.05-5mm, the average pore size of the granular red mud absorbent is 22.13nm, the specific surface area of the granular red mud absorbent is 17.42-23.95m2 / g, and the total pore volume of the granular red mud absorbent is 0.1325ml / g. The method is implemented as follows: mixing red mud containing certain water and dry cement uniformly, mixing and granulating by adopting a granulator, and then maintaining in the wet environment to finally obtain the granular red mud absorbent. The produced granular red mud absorbent is low in cost and good in absorbing effect, is cheap and practical, has good desorption capability and can be applied to the treatment process of organic wastewater or heavy metal wastewater.

Description

[0001] Field [0002] The invention discloses a granular red mud adsorbent and a preparation method thereof, in particular to a method for making a granular adsorbent with a certain strength by using red mud produced in the production process of alumina as the main raw material and adding a binder to make a granular adsorbent. Environmental protection and water treatment technology field. technical background [0003] In recent years, my country's pressure on environmental protection has been increasing, and the country has also strengthened its emphasis on environmental protection. In order to effectively control pollution and improve environmental quality, starting from 2011, a large number of national environmental protection laws and standards will be implemented. Water pollution control is the top priority of environmental pollution control. [0004] At present, the commonly used methods of water treatment are physical treatment and chemical treatment, mainly including ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/30C02F1/28
Inventor 巨少华卢帅丹彭金辉张利波王亚健郭胜惠
Owner KUNMING UNIV OF SCI & TECH
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