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Method for Carbon Sequestration in High Alkaline Alumina Red Mud

A technology of alumina and high alkalinity, applied in the direction of ammonium carbonate/acid carbonate, etc., can solve the problems of breaking the balance of soil pH, changing the hardness of groundwater, and destroying the ecological environment, achieving good carbon sequestration effect, Improved reactivity and simple process

Active Publication Date: 2022-06-24
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The alumina smelting process introduces a large amount of caustic soda, resulting in a red mud pH between 12 and 14. Long-term stacking will break the pH balance of the soil and damage the ecological environment. If the filtrate seeps down, it will also cause changes in the hardness of groundwater, which is harmful to humans. and other animal health hazards

Method used

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  • Method for Carbon Sequestration in High Alkaline Alumina Red Mud

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Embodiment 1

[0034] The raw material ratio of alumina red mud carbon fixation: 25.0kg of ground red mud, 2.5kg of quicklime, 10.0kg of ammonium dihydrogen phosphate and 12.5kg of water.

[0035] (1) Preparation of raw materials: dry the undisturbed alumina red mud, grind it through a 150 μm square-hole sieve for use; industrial grade ammonium dihydrogen phosphate; calcareous quicklime powder; ordinary drinking water; test undisturbed red mud, ground red mud and Chemical composition and soluble potassium and sodium ion content of activated red mud, and converted into soluble Na 2 O and K 2 The total amount of O, test and calculation results are shown in Table 1.

[0036]Table 1 The chemical composition mass percentage and total amount of soluble potassium and sodium oxides of undisturbed red mud, ground red mud and activated red mud.

[0037]

[0038] (2) Ammonia gas collection: according to figure 1 The process flow of alumina red mud carbon fixation is shown, using figure 2 The eq...

Embodiment 2

[0046] The ratio of raw materials for carbon fixation of alumina red mud: 25.0kg of ground red mud, 5.0kg of quicklime, 12.5kg of ammonium dihydrogen phosphate and 7.5kg of water.

[0047] Except for the mixing ratio, other processes are the same as in Example 1. After the weighing test, using the mixing ratio and process of Example 2, 25kg of activated alumina red mud can fix 2080L (4.15kg) of carbon dioxide gas to obtain 8.02kg of ammonium bicarbonate and 46.5kg of phosphorus-containing red mud (water content 20.2%) .

Embodiment 3

[0049] The ratio of raw materials for carbon fixation of alumina red mud: 25.0kg of ground red mud, 4.0kg of quicklime, 9.0kg of ammonium dihydrogen phosphate and 12.0kg of water.

[0050] Except for the mixing ratio, other processes are the same as in Example 1.

[0051] After the weighing test, using the mixing ratio and process of the implementation case 3 of the present invention, 25kg of activated alumina red mud can fix 1490L (2.95kg) of carbon dioxide gas, and obtain 5.90kg of ammonium bicarbonate and 48.1kg of phosphorus-containing red mud (water content). 24.6%).

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Abstract

The invention provides a method for carbon fixation of highly alkaline alumina red mud, the steps are as follows: (1) drying the red mud and using a ball mill to grind and sieve; (2) grinding the red mud in step (1), oxidizing Stir calcium and water evenly, add ammonium dihydrogen phosphate, vigorously stir and stand still, cycle 3‑5 times; (3) collect ammonia gas through a one-way exhaust pipe during step (2) vigorously stir and stand still, and then collect Phosphorus-containing red mud residue; (4) Introduce the ammonia gas collected in step (3) into a reactor container filled with distilled water to obtain saturated ammonia water, and pass excess carbon dioxide into the saturated ammonia water to prepare ammonium bicarbonate. The invention realizes the fixation of flue gas carbon dioxide, and prepares nitrogen fertilizer which can be used in agricultural production; on the other hand, after the carbon fixation process, the alkalinity of the red mud is reduced, the reactivity is improved, and a large amount of phosphate ions is rich in it, which makes it useful in construction Provides a foundation for applications in the field of materials and soil improvement.

Description

technical field [0001] The invention relates to the application field of industrial waste gas and solid waste recycling, and in particular relates to a method for carbon-fixing with high basic alumina red mud. Background technique [0002] In 2019, global emissions remained at 33 billion tons, energy-related global carbon dioxide emissions stopped growing, and China's emissions rose but moderated. The BP Statistical Yearbook of World Energy 2019, released by BP, highlights that calls for action on climate change are growing, but actual progress in reducing carbon emissions has been relatively slow. [0003] With the increasingly serious greenhouse effect of excessive carbon dioxide emissions, the global average temperature has increased by 1°C in the past 150 years, causing glaciers to melt, sea levels to rise, extreme weather to increase, affecting natural ecosystems, destroying biodiversity, and species extinction. Therefore, how to reduce carbon dioxide emissions and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/26C04B12/02
CPCC01C1/26C04B12/02
Inventor 刘俊霞海然张磊惠存李建伟程学磊李忠育
Owner ZHONGYUAN ENGINEERING COLLEGE
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