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

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.