Particle red-mud adsorbent preparing method used for phosphate adsorption

An adsorbent and red mud technology, applied in the field of environmental treatment, can solve the problems of unsuitability for large-scale popularization and application, low strength and porosity of ceramic adsorbent, poor adsorption performance, etc., achieve good phosphate adsorption capacity, and solve the problem of phosphoric acid The effect of salt recovery and easy access to materials

Inactive Publication Date: 2015-09-09
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent with the publication number CN1317548A uses red mud, fly ash, and clay as raw materials and prepares ceramic adsorbents with pore-forming a

Method used

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  • Particle red-mud adsorbent preparing method used for phosphate adsorption

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Embodiment 1

[0031] (1) Take a certain amount of raw red mud, mix it with the calcium and magnesium ion solution at a weight ratio of 1:5, and stir continuously until the pH reaches 8.4;

[0032] (2) Separating the above-mentioned red mud mixture with calcium and magnesium ions into solid and liquid, and washing the solid sample with deionized water for several times until the pH of the filtrate is neutral, and then drying the solid sample at 100° C. for 12 hours;

[0033] (3) Grinding and sieving the dried sample after natural cooling to obtain neutralized red mud with a particle size of 100 μm;

[0034] (4) Add the neutralized red mud to the hydrochloric acid solution of 10.0mol / L at the dosage of 0.5g / L, and react at 40°C for 5h;

[0035] (5) Separating the above red mud mixed with hydrochloric acid solution into solid and liquid, and washing the solid sample with deionized water for several times until the pH of the filtrate is neutral, then drying the solid sample at 100°C for 12 hour...

Embodiment 2

[0044] Prepare a phosphate solution with an initial concentration of 500 mg / L and an initial pH of 7.0, add the red mud particles prepared in Example 1, and stir at 100 rpm for 48 hours at a temperature of 40°C. The results obtained are as follows: the specific surface area and total pore volume of the red mud particles are 113.54m 2 / g and 0.0287cm 3 / g. The phosphate adsorption capacity of unit particle red mud-based adsorbent reached 84.56mg / g.

Embodiment 3

[0046] (1) Take a certain amount of raw red mud, mix it with the calcium and magnesium ion solution at a weight ratio of 1:5, and stir continuously until the pH reaches 8.4;

[0047] (2) Separating the above-mentioned red mud mixture with calcium and magnesium ions into solid and liquid, and washing the solid sample with deionized water for several times until the pH of the filtrate is neutral, and then drying the solid sample at 100° C. for 12 hours;

[0048] (3) Grinding and sieving the dried sample after natural cooling to obtain neutralized red mud with a particle size of 100 μm;

[0049] (4) Add the neutralized red mud to the hydrochloric acid solution of 10.0mol / L at the dosage of 0.5g / L, and react at 40°C for 5h;

[0050] (5) Separating the above-mentioned red mud mixture with hydrochloric acid solution into solid and liquid, and washing the solid sample with deionized water for several times until the pH of the filtrate is neutral, and then drying the solid sample at 1...

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Abstract

The invention discloses a particle red-mud adsorbent preparing method used for phosphate adsorption and belongs to the technical field of environment treatment. The particle red-mud adsorbent preparing method includes preparing acid-activation neutralized red mud under a certain condition, and preparing particle red-mud absorbent by the acid-activation neutralized red mud, straw powder and hydroxypropyl methyl cellulose under a certain condition. The prepared particle red-mud absorbent is used for adsorbing phosphate adsorption. The particle red-mud adsorbent preparing method is simple and practical, and the prepared particle red-mud absorbent is large in specific surface area, has excellent phosphate adsorption capacity and plays an important role in pollution of red mud, recovery of phosphate and waste treatment by waste.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a method for preparing a granular red mud-based adsorbent used for phosphate adsorption. Background technique [0002] Red mud is the polluting waste discharged from the aluminum industry when it extracts alumina. For every ton of alumina produced, an average of 0.3-2.0 tons of red mud is produced. The annual global red mud production is about 120 million tons. At present, most of the red mud relies on large-scale storage yards, and there is no effective way to use it. It not only takes up a lot of land, but also causes serious pollution to the environment. Therefore, the resource utilization of red mud is imminent. [0003] At present, some studies have made powdered red mud into an adsorbent for the adsorption of phosphate. Although the physical and chemical properties of red mud from different sources are different, they all have good adsorption...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/30C02F1/28C02F1/58
Inventor 张盼月叶捷曾光明吴彦张海波房玮刘建波晏铭苟玺莹
Owner HUNAN UNIV
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