Method for producing expanded vermiculite with microwave method

Abstract

The invention relates to a method of producing expanding vermiculite with a microwave method. The method comprises the steps as follows: microwave is adopted to expand for the vermiculite and interactive effect happens between the microwave and the vermiculite. The microwave effect causes water shake acutely among vermiculite layers. The partial temperature among layers arises rapidly and water among layers boiloffs rapidly. The vaporization water produces partial pressure to maintain the vermiculite layers and the layers. The invention has the macroscopic behavior that the vermiculite expands rapidly, and avoids the process of temperature expansion, thereby resolving the problem of brickle vermiculite after expansion. Simultaneously, as the vermiculite is cleaned before the expansion, the content of impurity is decreased and the quality of vermiculite after expansion is improved. The high-quality expanded vermiculite made by adopting the method can be used in the application fields such as high-quality expansion vermiculite powder for producing high-temperature mechanism part heat barrier coating, bulking agent for composing the organic clay composite material, filling material of energy-saving heat preservation wall and materials for producing high-quality heat insulation vermiculite boards.

Description

technical field [0001] The invention relates to a method for preparing expanded vermiculite by microwave Background technique [0002] Expanded vermiculite is made by heating vermiculite raw ore to a certain temperature, rapidly losing water and expanding rapidly. Expanded vermiculite has the characteristics of fire prevention, heat insulation, sound absorption, non-toxic, low weight capacity, moisture absorption and antibacterial, and is widely used in construction and industrial energy saving. , environmental protection, agriculture and animal husbandry, horticulture and other fields. [0003] In the construction industry, expanded vermiculite is mainly used to make loose fillers, expanded vermiculite products, expanded vermiculite concrete, etc., and is used as materials for light weight, heat preservation, heat insulation, sound absorption, and fire prevention. For example, after the expanded vermiculite is dispersed in the asphalt, the lightweight roof board made of it...

AI Technical Summary

Problems solved by technology

Because it is heated at 800-900 degrees, the vermiculite will gradually become brittle and fragmented while expanding, resulting in a lot of expanded vermiculite powder, which greatly affects the quality and application range of expanded vermiculite

In addition, the thermal expansion process mostly uses coal as fuel to generate heat, which will cause waste gas emissions and pollute the environment. At the same time, because there are more inhalable particles in the production workshop, it is easy for workers to suffer from occupational diseases.

[0009] The fluidized bed heating expansion method is a new technology that has become popular in recent years. Using natural gas as fuel greatly improves the combustion efficiency and energy utilization rate. At the same time, the production environment has also been improved, but it still cannot solve the problem of vermiculite brittleness. Key issues of stone quality