US 12,220,680 B2
Red mud-based sewage treatment agent and preparation method thereof, red mud-based ceramsite concrete and preparation method thereof, and applications
Shucai Li, Jinan (CN); Jian Zhang, Jinan (CN); and Zhaofeng Li, Jinan (CN)
Assigned to SHANDONG UNIVERSITY, Jinan (CN)
Appl. No. 17/283,591
Filed by SHANDONG UNIVERSITY, Shandong (CN)
PCT Filed Apr. 3, 2020, PCT No. PCT/CN2020/083229
§ 371(c)(1), (2) Date Apr. 8, 2021,
PCT Pub. No. WO2021/168995, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 202010127619.4 (CN), filed on Feb. 28, 2020.
Prior Publication US 2022/0143571 A1, May 12, 2022
Int. Cl. B01J 20/00 (2006.01); B01J 20/12 (2006.01); B01J 20/18 (2006.01); B01J 20/26 (2006.01); B01J 20/30 (2006.01); C02F 1/28 (2023.01)
CPC B01J 20/12 (2013.01) [B01J 20/183 (2013.01); B01J 20/261 (2013.01); B01J 20/3021 (2013.01); B01J 20/3028 (2013.01); B01J 20/3042 (2013.01); B01J 20/3078 (2013.01); B01J 20/3085 (2013.01); C02F 1/281 (2013.01)] 15 Claims
 
1. A red mud-based ceramsite concrete, wherein the raw material composition of the red mud-based ceramsite concrete comprises the following components in mass percent: 15-30% of a solid waste complex after acidification treatment, 55-75% of a red mud-based sewage treatment agent after adsorption of pollutants, and the balance being water; a shell formed by mixing the solid waste complex after acidification treatment with water is coated on the surface of the red mud-based sewage treatment agent after adsorption of pollutants; and
the red mud-based sewage treatment agent after adsorption of pollutants is obtained using a red mud-based sewage treatment agent for sewage treatment; wherein the sewage treatment agent comprises the following components in mass percent: 80-90% of a solid waste complex subjected to acidification treatment, 2.0-15% of an alkali activator, 0-1.0% of a water reducer, 0.5-2.0% of an ultrafine additive, and 1.0-5.0% of a surfactant; and the solid waste complex comprises: at least one of 0-40% of blast furnace slag powder, 0-50% of fly ash, 0-30% of coal gangue powder and 0-35% of iron tailings powder and 40-60% of red mud powder; and
the red mud-based sewage treatment agent is prepared by a method comprising the following steps:
(1) drying, grinding and sieving at least one of blast furnace slag, fly ash, coal gangue and iron tailings powder and red mud respectively, and then, uniformly mixing the obtained powder in proportion to obtain a solid waste complex;
(2) performing acidification treatment on the solid waste complex by means of industrial tail gas in heating and pressurizing states, and after the acidification treatment is completed, drying, grinding and sieving the obtained solid waste complex to obtain a modified solid waste complex; and
(3) uniformly mixing the modified solid waste complex, the alkali activator, the water reducer, the ultrafine additive and the treatment agent in proportion, and then, pulping, granulating and curing the obtained mixture to obtain a red mud-based sewage treatment agent, is used for sewage treatment.