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Method and application for extracting iron and aluminum in red mud to prepare absorbent

An adsorbent and red mud technology, which is applied in the field of water treatment, can solve the problem that the fluoride ion removal method cannot take into account the low cost and high adsorption capacity, and achieves the effects of low production cost, simple preparation method, and deepened resource utilization.

Inactive Publication Date: 2016-11-16
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is to solve the problem that the existing fluoride ion removal method cannot take into account both low cost and high adsorption capacity, and provides a method and application of extracting iron and aluminum from red mud to prepare adsorbent

Method used

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Examples

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Effect test

specific Embodiment approach 1

[0014] Embodiment 1: In this embodiment, a method for extracting iron and aluminum from red mud to prepare an adsorbent is carried out in the following steps:

[0015] 1. Acid leaching red mud: according to the liquid-solid ratio (ml / g) of 10~20, dilute hydrochloric acid with a concentration of 1~5mol / L is added to the dried red mud powder, and the acid leaching temperature is 60~100℃ Stir and leaching for 0.5~2.5h, and obtain the leachate after being separated by a centrifuge;

[0016] 2. Separation and purification of iron and aluminum: add excess sodium hydroxide solution to the leaching solution obtained in step 1 to generate reddish-brown precipitated ferric hydroxide, and carry out solid-liquid separation, and take its supernatant and set it aside for later use; Hydrochloric acid is made into ferric chloride solution, which is evaporated and concentrated, cooled and crystallized, and filtered to obtain ferric chloride hexahydrate; dilute hydrochloric acid is added to the...

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the liquid-solid ratio in Step 1 is 16:1. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the concentration of dilute hydrochloric acid in step 1 is 3 mol / L. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method and application for extracting iron and aluminum in red mud to prepare an absorbent with an aim to solve the problem that low cost and high adsorption capacity cannot be combined with an existing fluorine ion removal method. The method includes 1), acid leaching of the red mud, namely using diluted hydrochloric acid to leach the iron and aluminum from the red mud; 2), subjecting the iron and aluminum to separation and purification, adding sodium hydroxide into a leaching agent, generating sediment and subjecting to solid-liquid separation, adding the diluted hydrochloric acid into the sediment to obtain a ferric chloride solution, and subjecting the ferric chloride solution to evaporation concentration and cooling crystallization to obtain iron chloride hexahydrate; adding the diluted hydrochloric acid in supernate to obtain an aluminum chloride solution, and subjecting the aluminum chloride solution to evaporation concentration and cooling crystallization to obtain aluminum chloride hexahydrate; 3), preparation of the absorbent, namely taking ferric trichloride and aluminum trichloride obtained in the red mud as main materials and adjusting pH (potential of hydrogen) with a coprecipitation method under the room temperature to obtain sediment which is subjected to washing, drying and grinding to obtain the absorbent. The absorbent prepared with the method is applied to removal of fluorinion in water.

Description

technical field [0001] The invention relates to a method and application for preparing an adsorbent by extracting iron and aluminum from red mud, belonging to the technical field of water treatment. Background technique [0002] Excessive fluoride content in drinking water will affect the metabolism of calcium and phosphorus in the human body, and make the material metabolism and physiological functions of the human body disordered. Long-term exposure to excessive fluoride in the environment will lead to symptoms of fluorosis such as dental fluorosis and bone fluorosis. China's safe drinking water standard stipulates that the concentration of fluoride ion should not exceed 1.0mg / L. [0003] At present, the methods for removing fluoride from fluorine-containing water mainly include coagulation sedimentation, chemical precipitation, adsorption, ion exchange, electrodialysis, and reverse osmosis. Among the commonly used fluoride removal methods, the adsorption method has becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/30C02F1/28C02F101/14
CPCB01J20/06B01J20/08B01J2220/4887C02F1/281C02F1/288C02F2101/14
Inventor 朱琦李丽邢子鹏满可心郭筝司麒石
Owner HEILONGJIANG UNIV
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