Method for preparing cement mortar with photocatalysis function from red mud solid wastes
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A technology of cement mortar and photocatalysis, which is applied in the field of cement mortar to achieve important social and economic benefits, reduce pollution, and improve air quality
Inactive Publication Date: 2017-05-31
SHANDONG JIAOTONG UNIV
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However, no patent has been reported on the use of red mud solid waste to prepare cement mortar to achieve photocatalytic purification of VOC and NOx in the atmosphere after searching a large number of patents and literature
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Embodiment 1
[0023] Preparation of Granular Red Mud
[0024] (1) Weigh 100kg of red mud solid waste and sinter at 550°C for 3.5 hours;
[0025] (2) Pulverize the red mud solid waste sintered in step (1), and pass through a 100-120-mesh sieve, so that the particle size is 0.12mm-0.15mm to obtain granular red mud.
Embodiment 2
[0027] The photocatalytic functional cement mortar is prepared by using red mud, which is suitable for engineering plastering construction.
[0028] The heat-treated red mud prepared by the method in Example 1 is used as raw material, and the specific raw material mixing ratio is shown in Table 1.
[0029] Catalyst performance evaluation is achieved by the following devices:
[0030] Reactor: airtight ventilation pipe, filled with 2 pieces of cement mortar in the middle, and an ultraviolet lamp is installed on the top of the device. Take formaldehyde, benzene, toluene, and nitric oxide as simulated gas pollutants, collect air samples at the inlet and outlet sampling points every 30 minutes, test the concentration of pollutants, calculate the average value, and calculate the primary purification efficiency of the photocatalyst for gas pollutants .
[0031] The gas flow rate is 1.00L / min and 2.00L / min, the temperature is room temperature, and the air humidity is 50±5%.
[003...
Embodiment 3
[0036] The photocatalytic functional cement mortar is prepared by using red mud, which is suitable for engineering plastering construction.
[0037] The heat-treated red mud prepared by the method in Example 1 was used as raw material, and the specific raw material mixing ratio is shown in Table 2.
[0038] The photocatalytic functional mortar was tested as in Example 2, and the catalytic effect evaluation is shown in Table 7.
[0039] Table 2:
[0040]
[0041]
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Abstract
The invention discloses a method for preparing cement mortar with a photocatalysis function from red mud solid wastes. The method comprises the following steps: sintering the red mud solid wastes at temperature of 500 to 600 DEG C for 2 to 5 hours, and carrying out screening to prepare red mud particles with the particle size of 0.12 to 0.15 mm; then mixing and stirring the red mud particles with cement, sand, a polycarboxylic acid water reducing agent and water to prepare the cement mortar with the photocatalysis function. According to the method disclosed by the invention, Fe2O3, TiO2 and V2O5 photocatalysts in sintered red mud are used for generating photocatalysis action after absorbing the sunlight, so that nitric oxides and volatile organic compounds (VOC) in the atmospheric environment can be removed under catalysis in real time, and a function of purifying atmosphere is realized; meanwhile, the use range of the red mud solid wastes is expanded, the additional value of the red mud solid wastes is increased, and the aim of sustainable development is fulfilled; the method has important social and economical benefits.
Description
technical field [0001] The invention belongs to the technical field of cement mortar. Specifically relates to a method for preparing cement mortar with photocatalytic function by using red mud solid waste. Background technique [0002] Red mud is the polluting waste residue produced when alumina is extracted from bauxite in the aluminum industry. Generally, 1.0-1.2 tons of red mud is discharged for every ton of alumina produced. At present, the method of large-scale disposal of red mud in the world is mainly through the construction of red mud storage yards for long-term storage. The construction of the red mud storage yard is based on the geographical location. In mountainous areas, valleys and deep pits can be used for construction; in plain areas, deep pits can be piled up on flat ground; Seabed and other methods. This method occupies a large amount of land, and the chemical components in the red mud infiltrate the land, which is easy to cause ecological and environmen...
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