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Preparation method of red mud with super-large specific surface area

A technology of specific surface area and red mud, which is applied in the field of red mud preparation with super large specific surface area, can solve problems such as difficult treatment, large land occupation, groundwater and environmental pollution, and achieve enhanced utilization, increased utilization probability, The effect of reducing pollution

Inactive Publication Date: 2019-11-26
HENAN CHANGXING IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Red mud is a solid powdery alkaline waste produced in the production process of alumina industry. Due to its complex composition, it is difficult to handle. At present, most of the red mud treatment methods adopt the direct accumulation method. This method not only takes up a lot of land , and with the extension of the stacking time, the alkaline substances and some other harmful substances in the red mud will enter the soil with the rainwater, causing huge pollution to groundwater and the environment

Method used

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  • Preparation method of red mud with super-large specific surface area
  • Preparation method of red mud with super-large specific surface area
  • Preparation method of red mud with super-large specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Take a 500mL three-necked round-bottom flask and place it in a constant temperature electric heating cap, connect the stirrer and the condenser with cooling water, take 30g of the original Bayer process red mud and 180mL of 6mol / L concentrated hydrochloric acid into the three-necked flask.

[0025] (2) Set the temperature of the constant temperature heating cap to 65°C, the speed of the stirrer to 500r / min, and the reaction time to 1h.

[0026] (3) After the reaction is completed, pour the turbid liquid into a vacuum filter bottle for solid-liquid separation, wash the solid with deionized water until it is nearly neutral, then dry, crush, and grind the solid, and then pass through an 80-mesh sieve, and then Store samples in airtight containers.

[0027] (4) Take a small amount of the sample from step 3 to measure its specific surface area, pore volume and pore size distribution. The measured specific surface area is 428.53m 2 / g, the pore volume is 389.67m 2 / g. ...

Embodiment 2

[0029] (1) Take a 500mL three-necked round-bottom flask and place it in a constant temperature electric heating cap, connect the stirrer and the condenser with cooling water, take 30g of the original Bayer process red mud and 180mL of 12mol / L concentrated hydrochloric acid into the three-necked flask.

[0030] (2) Set the temperature of the constant temperature heating cap to 65°C, the speed of the stirrer to 500r / min, and the reaction time to 1h.

[0031] (3) After the reaction is completed, pour the turbid liquid into a vacuum filter bottle for solid-liquid separation, wash the solid with deionized water until it is nearly neutral, then dry, crush, and grind the solid, and then pass through an 80-mesh sieve, and then Store samples in airtight containers.

[0032] (4) Take a small amount of the sample from step 3 to measure its specific surface area, pore volume and pore size distribution. The measured specific surface area is 292.63 m 2 / g, the pore volume is 242.12 m 2 / ...

Embodiment 3

[0034] (1) Take a 500mL three-neck round-bottom flask and place it in a constant temperature electric heating cap, connect the stirrer and the condenser with cooling water, take 30g of the original sintering red mud and 180mL of 6mol / L concentrated hydrochloric acid into the three-necked flask.

[0035] (2) Set the temperature of the constant temperature heating cap to 65°C, the speed of the stirrer to 500r / min, and the reaction time to 1h.

[0036] (3) After the reaction is completed, pour the turbid liquid into a vacuum filter bottle for solid-liquid separation, wash the solid with deionized water until it is nearly neutral, then dry, crush, and grind the solid, and then pass through an 80-mesh sieve, and then Store samples in airtight containers.

[0037] (4) Take a small amount of the sample from step 3 to measure its specific surface area, pore volume and pore size distribution. Its specific surface area was measured to be 602.71 m 2 / g, the pore volume is 550.44 m 2 / ...

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Abstract

The invention provides a preparation method of red mud with a super-large specific surface area. The method comprises the following steps: drying, crushing, grinding and sieving of red mud, an acid leaching reaction, filtration after the reaction, and water washing, drying, crushing, grinding and sieving of the obtained filter residues to obtain the red mud with the super-large specific surface area. The red mud produced in the alumina industry is used as a raw material, alkaline substances in the red mud are removed through reaction, and some calcium salts, ferric salts and other substances are dissolved out to obtain the new product. The specific surface area of the new product is 5-20 times higher than that of the red mud, so the heavy metal adsorption capacity of the red mud is improved, the problem of environmental pollution caused by traditional red mud accumulation is solved, the new use of the red mud is developed, waste is changed into valuables, and the self values are improved.

Description

technical field [0001] The invention relates to the technical field of functional inorganic materials, in particular to a method for preparing red mud with a super large specific surface area. Background technique [0002] Red mud is a solid powdery alkaline waste produced in the production process of alumina industry. Due to its complex composition, it is difficult to handle. At present, most of the red mud treatment methods adopt the direct accumulation method. This method not only takes up a lot of land , and with the extension of the stacking time, the alkaline substances and some other harmful substances in the red mud will enter the soil with the rainwater, causing huge pollution to groundwater and the environment. [0003] How to reduce the pollution caused by red mud to the environment, make full use of the value of red mud, and achieve the purpose of treating waste with waste has become an urgent problem to be solved in the aluminum industry. In many experiments, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08C02F1/28B01J20/30C02F101/20
CPCB01J20/08C02F1/281C02F2101/20
Inventor 孙志昂郭焱王倩张越何小山席艺慧
Owner HENAN CHANGXING IND CO LTD
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