Method for preparing granular artificial pumice stone by taking black shale as raw material

Abstract

The invention relates to a method for preparing granular artificial pumice stone by taking black shale as a raw material. According to the method, the natural black shale is taken as an ore raw material and any other reagents are not added, and the method comprises the following steps: 1) crushing the ore raw material to -20mm by adopting a crushing device; 2) sieving crushed ore to obtain a material with the particle size of 3mm-20mm by adopting a sieving device; 3) heating the sieved material to 240 DEG C-800 DEG C by adopting a calcining and heating device and the heating rate of 10 DEG C/min-20 DEG C/min in an air environment, and performing heat preservation for 12-30min; 4) heating the material after preheating and heat preservation to 1100 DEG C-1250 DEG C by adopting the heating rate of 10 DEG C/min-20 DEG C/min in the air environment and performing heat preservation for 15-30min; 5) slowly cooling the calcined and expanded material to below 400 DEG C in the air environment; and 6) sieving the calcined, expanded and cooled material to the particle size of 5mm-25mm by adopting the sieving device, thereby obtaining the granular artificial pumice stone. The method provided by the invention has the advantages of obvious effects, good safety, simple process, easiness in popularization and application, a wide range of applications and significant social and economic benefits.

Description

technical field [0001] The invention relates to a method for preparing granular artificial pumice using black shale as a raw material. Natural black shale is used as raw material without adding any other reagents, and an optimized calcining and puffing process is adopted to prepare artificial pumice. It is suitable for using natural black shale as a raw material. Granular artificial pumice as raw material is processed and prepared. Background technique [0002] Pumice, also known as pumice or pumice, has many pores, light weight, and a bulk density of less than 1000kg / m 3 , named after being able to float on water. Natural pumice is a porous, light glassy acidic volcanic extrusive rock with a bulk density of 450kg / m 3 Its chemical composition is equivalent to that of rhyolitic intermediate-acid volcanic rocks, generally silicates rich in aluminum, potassium, and sodium, that is, SiO 2 A natural substance composed like glass as the main component. Natural pumice has the c...

AI Technical Summary

Problems solved by technology

[0012] The methods for preparing artificial pumice in the prior art, including the above, often need to add a variety of ingredients, the raw materials are not easy to obtain and the cost is high, the preparation steps are also relatively cumbersome, and the quality of the obtained artificial pumice also needs to be improved

[0013] On the other hand, black shale is a natural ore with a wide distribution, and its application field is relatively narrow at present, and there is no report on using black shale as a raw material to prepare artificial pumice

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