Method for preparing ecological foamed ceramic from lepidolite filter mud whole waste

Patent metadata

Field	Value
Publication number	US-2024059619-A1
Application number	US-202318500592-A
Country	US
Kind code	A1
Filing date	Nov 2, 2023
Priority date	May 9, 2022
Publication date	Feb 22, 2024
Grant date	—

Abstract

A method for preparing an ecological foamed ceramic from lepidolite filter mud whole waste belongs to the field of environmental protection and resource reuse. The ecological foamed ceramic with excellent properties can be prepared by using lepidolite filter mud as the main raw materials, including ball milling, homogenization, drying, material distribution, and heat treatment. The amount of lepidolite filter mud in the present invention accounts for more than 90%, which is a whole waste utilization and can achieve high-value utilization of bulk lepidolite filter mud. The present invention uses a composite foaming agent combined with a foaming technology and has the advantages of rapid foaming and controllable pore size compared with a single foaming agent. The ecological foamed ceramic prepared by the present invention meets the industrial standard of CJ/T 299-2008 “Artificial ceramic filter material for water treatment” and has potential application value in domestic sewage treatment.

First claim

What is claimed is:

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 the dry weight of the lepidolite filter mud, and silicon carbide accounts for 0.5%-2% of the dry weight of the lepidolite filter mud; wherein the particle size of the lepidolite filter mud is less than 200 meshes; ball milling is performed in a wet milling manner; the mass ratio of ball-to-material is 1:1-1.2:1, the mass ratio of water-to-material is 0.8:1-1.2:1; the 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 the material is the total mass of the dry weight of the lepidolite filter mud and the composite foaming agent;
(2) homogenization: subjecting the ball abrasive obtained in step (1) to homogenizing to obtain a homogenized material; (3) drying: subjecting the homogenized material obtained in step (2) to spray drying to obtain a dried material; (4) material distribution: subjecting the dried material obtained in step (3) to material distribution to obtain a green body; and (5) heat treatment: subjecting the green body obtained in step (4) to heat-treating to obtain the ecological foamed ceramic, wherein the ecological foamed ceramic meets the industrial standard of CJ/T 299-2008 “Artificial ceramic filter material for water treatment”; wherein the specific heat treatment comprises: increasing the 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 the end of the firing.

2 . The method for preparing ecologically foamed ceramic from lepidolite filter mud whole waste of claim 1 , wherein during the homogenizing in step (2), the stirring speed of the homogenization process is 0.5-2 r/min, and the homogenization time is 6-12 h; after homogenization, the material is passed through a 60-mesh sieve.

Assignees

• Univ Beijing Technology

Inventors

• Pan Dean
• Zhang Xiaoguang
• Kong Ruhao
• Zhang Qijun
• Tan Zhe
• Wang Wei

Classifications

• C04B2111/00017

  Aspects relating to the protection of the environment · CPC title

• C04B38/10 Primary

  by using foaming agents (C04B38/02 takes precedence){or by using mechanical means, e.g. adding preformed foam} · CPC title

• C04B35/19

  Alkali metal aluminosilicates, e.g. spodumene · CPC title

• C04B35/62204

  using waste materials or refuse (clay-wares containing waste materials C04B33/132) · CPC title

• C04B35/6261

  Milling · CPC title