Non-sintered ceramic aggregate with stone coal vanadium extraction tailings as main raw material and preparation method thereof

Abstract

The invention relates to a non-sintered ceramic aggregate with stone coal vanadium extraction tailings as a main raw material and a preparation method thereof. The non-sintered ceramic aggregate comprises the following raw material components in percentage by weight: 45-60 percent of stone coal vanadium extraction tailings, 10-30 percent of fly ash, 7-15 percent of solid alkali exciter, 5-10 percent of cement, 5-10 percent of quick lime, 2-5 percent of gypsum and 5-15 percent of water. The preparation method comprises the following steps of: according to the raw materials and the contents thereof, uniformly mixing the stone coal vanadium extraction tailings and the solid alkali exciter and grinding to be below 0.074 mm to prepare a prefabricated material; adding the fly ash, the cement, the quick lime, the gypsum and the water into the prefabricated material and uniformly stirring to prepare a mixture; aging the mixture for 1-3 hours; pelletizing; aging for 3-7 days; holding in an autoclave; and autoclaving under the condition of 0.8-1.2 MPa for 6-10 hours. The non-sintered ceramic aggregate has the advantages of environmental friendliness, simple process, low energy consumption and high utilization rate of tailings; and a prepared non-sintered ceramic aggregate product has high strength and good thermal insulation performance.

Description

technical field [0001] The invention belongs to the technical field of unfired ceramsite. In particular, it relates to a non-burning ceramsite and a preparation method thereof, which uses the tailings of vanadium extraction from stone coal as the main raw material. Background technique [0002] In recent years, ceramsite has been widely used in building materials, horticulture, food and beverage and refractory insulation materials due to its light weight, corrosion resistance and good insulation properties. It is more in line with the trend of energy saving in production and has received widespread attention. At present, the main raw materials for making ceramsite are aluminosilicate minerals or industrial solid waste. In research at home and abroad, clay, shale or fly ash are mainly used as raw materials to prepare ceramsite, such as "shale unfired ceramsite". (CN201068430Y, 2008) patented technology; Alkali activator in the traditional technology is that the heat energy ...

AI Technical Summary

Problems solved by technology

At present, the main raw materials for making ceramsite are aluminosilicate minerals or industrial solid waste. In research at home and abroad, clay, shale or fly ash are mainly used as raw materials to prepare ceramsite, such as "shale unfired ceramsite". (CN201068430Y, 2008) patented technology; Alkali activator in the traditional technology is that the thermal energy that does not produce in the grinding process is rationally utilized in adding the mixture, as " the prescription of exempting from steaming and exempting from burning fly ash ceramsite " (CN1868963A, 2006) patented technology, solid alkali activator particles are relatively coarse, which is not conducive to the leaching of active SiO2 and Al2O3; Pressed ceramsite is directly put into the autoclave for curing after the ball is made, without aging, which is not conducive to the growth of the strength of ceramsite

However, there is no report on the preparation of ceramsite by using the tailings of vanadium extraction from stone coal as raw material.

[0003] Vanadium extraction tailings from stone coal are waste residues left after the rare metal vanadium is extracted from stone coal through roasting and leaching processes. At present, the method of stacking is mainly adopted It is easy to cause problems such as land occupation, environmental pollution and waste of resources.