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A Red Mud Utilization Method Based on Co-processing of Industrial Tail Gas-Sewage Treatment-Green High Performance Civil Functional Materials
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A high-performance red mud technology, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., to improve adsorption efficiency, reduce toxic gas emissions, and stabilize product quality
Active Publication Date: 2021-02-23
SHANDONG UNIV
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Problems solved by technology
The process proposed by the invention can solve the problem of industrial tail gas discharge and the stockpiling of red mud-based sewage treatment agents, and prepare high-performance solid waste-based civil engineering functional materials. Red mud can absorb Ca in the process of sewage treatment. 2+ 、Na + , SO 4 2- , Cl - Plasma can improve the mechanical strength of red mud-based cementitious materials
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Embodiment 1
[0044] Based on the first technical solution mentioned in the claims, a method for preparing green civil engineering functional materials from red mud treatment sewage residues comprises the following steps: (the first step here is to prepare raw materials, grind and sieve, and the second The step is to prepare the ingredients)
[0045] (1) The red mud used is the Bayer process red mud, which is dried and ground and passed through a 200-mesh sieve to prepare a slurry with a water-cement ratio of 1.0;
[0046] (2) Adjust carbonization parameters: pressure 0.8MPa, temperature 80°C, industrial tail gas from power plant is used, carbonization time is 8 hours (to make the pH value of the red mud 8), and then the carbonized red mud is dried, ground and passed 300 mesh sieve, spare;
[0058] (2) Weigh 40 parts of red mud, 50 parts of granulated blast furnaceslag, 10 parts of sodiumhydroxide, and 5 parts of fly ash, add water until the water-cement ratio is 0.4, stir for 30 seconds and pour the test mold, and test parameters such as strength and setting time .
[0059] The test strength adopts GBT 17671-1999 cementmortar strength test method, the heavy metal leaching amount is tested according to GB / T30810-2014, and the performance indicators in Table 3 are obtained according to the test method:
[0060] Table 3 performance test results
[0061]
Embodiment 3
[0063] (1) Weigh 50 parts of red mud, 25 parts of steel slag, 20 parts of desulfurized gypsum, 10 parts of carbide slag, add water until the water-cement ratio is 0.6, and mix well;
[0064] (2) Calcinate the mixed sample to 1350°C, keep it warm for 3 hours, and dry it after water cooling;
[0065] (3) Grind the calcined sample to a specific surface area of 400m 2 / kg, add water until the water-cement ratio is 0.4, stir for 30s, pour the test block, and test parameters such as strength and setting time.
[0066] The test strength adopts GBT 17671-1999 cement mortar strength test method, the heavy metal leaching amount is tested according to GB / T30810-2014, and the performance indicators in Table 4 are obtained according to the test method:
[0067] Table 4 performance test results
[0068]
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Abstract
The invention relates to a red mud utilization method based on industrial tail gas-sewage treatment-green high-performance civil functional materials co-processing, which belongs to the technical field of environmental science and cementitious material preparation, especially relates to the preparation process of solid waste-based cementitious material, specifically : A high-performance, green and environmentally friendlyred mud-based green civil engineering functional material is prepared by coordinating the red mud residue of sewage treatment with other solid wastes, through physical and chemical activation and high-temperature calcination. The compressive strength of the solid waste-based gelling material prepared by the method proposed in the present invention can reach 29MPa, and the leaching amount of toxic elements such as heavy metals (less than 3.0ppm) is far lower than the national standard requirements, and the solid waste-based gelling material with good performance can be prepared .
Description
technical field [0001] The invention belongs to the technical field of environmental science and gelling material preparation, and in particular relates to the related fields of preparation of solid waste-based gelling material, utilization of industrial tail gas, and sewage treatment. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the rapid development of urban industry, the discharge of wastewater is increasing day by day, aggravating the degree of water pollution. According to national data, in 2007, the national sewage discharge was 65.7 billion tons, an increase of 4% over 2006. Among them, the discharge of industrial sewage was 23.6 billion tons, accounting fo...
Claims
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