US 12,006,268 B2
Method for preparing ecological foamed ceramic from lepidolite filter mud whole waste
Dean Pan, Beijing (CN); Xiaoguang Zhang, Beijing (CN); Ruhao Kong, Beijing (CN); Qijun Zhang, Beijing (CN); Zhe Tan, Beijing (CN); and Wei Wang, Beijing (CN)
Assigned to BEIJING UNIVERSITY OF TECHNOLOGY, Beijing (CN)
Filed by BEIJING UNIVERSITY OF TECHNOLOGY, Beijing (CN)
Filed on Nov. 2, 2023, as Appl. No. 18/500,592.
Application 18/500,592 is a continuation of application No. PCT/CN2023/088354, filed on Apr. 14, 2023.
Claims priority of application No. 202210496173.1 (CN), filed on May 9, 2022.
Prior Publication US 2024/0059619 A1, Feb. 22, 2024
Int. Cl. C04B 38/00 (2006.01); C04B 35/00 (2006.01); C04B 35/19 (2006.01); C04B 35/34 (2006.01); C04B 35/622 (2006.01); C04B 35/626 (2006.01); C04B 38/10 (2006.01); C04B 41/00 (2006.01)
CPC C04B 38/10 (2013.01) [C04B 35/19 (2013.01); C04B 35/62204 (2013.01); C04B 35/6261 (2013.01); C04B 35/62655 (2013.01); C04B 41/0072 (2013.01); C04B 2235/3472 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A method for preparing an ecological foamed ceramic from lepidolite filter mud whole waste, comprising the steps of (1) ball milling: subjecting a weighed lepidolite filter mud and a composite foaming agent to ball milling to obtain a ball abrasive, wherein sodium carbonate and silicon carbide are used as the composite foaming agent, wherein sodium carbonate accounts for 1%-8% of a dry weight of the lepidolite filter mud, and silicon carbide accounts for 0.5%-2% of a dry weight of the lepidolite filter mud; wherein a particle size of the lepidolite filter mud is less than 200 meshes; ball milling is performed in a wet milling manner; a mass ratio of ball-to-material is 1:1-1.2:1, a mass ratio of water-to-material is 0.8:1-1.2:1; a ball milling time is 4-8 h; and an 8-mesh grid is used in a discharging process of the ball milling; the mass of a material is the total mass of a dry weight of the lepidolite filter mud and the composite foaming agent;
(2) homogenization: subjecting the ball abrasive obtained in the step (1) to homogenizing to obtain a homogenized material; wherein a stirring speed of a homogenization process is 0.5-2 r/min, and a homogenization time is 6-12 h; after homogenization, a material is passed through a 60-mesh sieve;
(3) drying: subjecting the homogenized material obtained in the step (2) to spray drying to obtain a dried material;
(4) material distribution: subjecting the dried material obtained in the step (3) to material distribution to obtain a green body; and
(5) heat treatment: subjecting the green body obtained in the step (4) to heat-treating to obtain the ecological foamed ceramic, wherein the ecological foamed ceramic meets an industrial standard of CJ/T 299-2008;
wherein the heat treatment comprises: increasing a temperature from room temperature at a temperature rising rate of 8-15° C./min to 500-700° ° C., holding for 20-60 min, increasing the temperature at a temperature rising rate of 3-8° C./min to 1050-1200° C., holding for 30-60 min, decreasing the temperature at a cooling rate of 5-10° C./min to 700-800° C., holding for 10-30 min, and cooling for 80-120 min with a furnace to room temperature after an end of the firing.