US 12,221,379 B2
Method for preparing non-sintered shell-wrapped ceramsite using solid waste meanwhile immobilizing heavy metal in river sediment, and non-sintered river-sediment-based ceramsite
Hongzhi Cui, Shenzhen (CN); Dapeng Zheng, Shenzhen (CN); Qiangwei Pang, Shenzhen (CN); Yu Jin, Shenzhen (CN); and Yuan Fang, Shenzhen (CN)
Assigned to SHENZHEN UNIVERSITY, Guangdong (CN)
Filed by SHENZHEN UNIVERSITY, Shenzhen (CN)
Filed on Apr. 12, 2024, as Appl. No. 18/633,658.
Claims priority of application No. 202310395804.5 (CN), filed on Apr. 14, 2023.
Prior Publication US 2024/0343645 A1, Oct. 17, 2024
Int. Cl. C04B 18/02 (2006.01); B09B 3/27 (2022.01); B09B 3/70 (2022.01); C04B 18/04 (2006.01); C04B 20/10 (2006.01); C04B 28/06 (2006.01); B09B 101/90 (2022.01); C04B 111/00 (2006.01)
CPC C04B 18/0472 (2013.01) [B09B 3/27 (2022.01); B09B 3/70 (2022.01); C04B 18/021 (2013.01); C04B 28/065 (2013.01); B09B 2101/90 (2022.01); C04B 2111/00732 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for preparing a non-sintered river-sediment-based shell-wrapped ceramsite using solid waste meanwhile immobilizing a heavy metal in river sediment, comprising the steps of:
(1) dehydrating the river sediment and compacting to obtain a dry cake-shaped residual soil, and grinding the dry cake-shaped residual soil, to obtain a dry powdery residual soil;
(2) mixing the dry powdery residual soil with a solid waste powder and an alkali activating powder material, to obtain a mixture;
(3) subjecting the mixture to a first granulation, to obtain first grade cold-bonded ceramsites;
(4) sieving the first grade cold-bonded ceramsites to obtain first grade cold-bonded ceramsites having a particle size of not less than 1 mm and not more than 3 mm, and first grade cold-bonded ceramsites having a particle size of larger than 3 mm but not more than 5 mm, and performing a second granulation on the first grade cold-bonded ceramsites having a particle size of not less than 1 mm and not more than 3 mm, and the first grade cold-bonded ceramsites having a particle size of larger than 3 mm but not more than 5 mm, to obtain second grade cold-bonded ceramsites, wherein a mass ratio of the first grade cold-bonded ceramsites having a particle size of not less than 1 mm and not more than 3 mm to the first grade cold-bonded ceramsites having a particle size of larger than 3 mm but not more than 5 mm is in a range of (2-1):(1-2); and
(5) mixing the second grade cold-bonded ceramsites with a sulfoaluminate cement and a Portland cement, and subjecting a resulting mixture to a third granulation, to obtain the non-sintered river-sediment-based shell-wrapped ceramsite,
wherein based on a total mass of the dry powdery residual soil, the solid waste powder, and the alkali activating powder material being 100%, a mass content of the dry powdery residual soil is in a range of 70-80%, a mass content of the solid waste powder is in a range of 15-25%, and a mass content of the alkali activating powder material is in a range of 5-10%;
an adhesive is added during the first granulation and the second granulation;
a mass ratio of the sulfoaluminate cement to the Portland cement is in a range of (7-9):(3-1); and
a mass ratio of the second grade cold-bonded ceramsites to the sulfoaluminate cement is in a range of 3:1 to 3:2.