A preparation method of inert powder for suppressing starch deflagration

Abstract

The present invention proposes a method for preparing an inert powder for inhibiting starch deflagration, using chemically modified diatomite as the following inert powder for inhibiting starch deflagration, and the preparation process is as follows: first-grade diatomite for building materials is used as The raw material uses NaOH solution as a chemical modifier, and the inert powder that can inhibit starch deflagration is prepared through processes such as dissolution, stirring, ultrasonication, impregnation, water washing, filtration, drying, and grinding. The innovation of this invention is that NaOH modified diatomaceous earth is used as inert agent for the first time to remove organic combustible impurities, strengthen its characteristics such as large specific surface area, high porosity and adsorption rate, low thermal conductivity and low density, and prepare inorganic silicic acid Salt flame-inhibiting inerting agent, which has the characteristics of low cost, simple process, and strong inerting performance, has opened up the research of inorganic silicon powder in the inerting design of combustible dust.

Description

technical field [0001] The invention belongs to the technical field of chemical building materials and fire safety, and in particular relates to a method for preparing an inert powder capable of suppressing starch deflagration. Background technique [0002] Dust explosions in the industrial manufacturing process have caused catastrophic property losses and personal injuries to human society. Since a large amount of combustible dust is easily produced in the industrial manufacturing process, for organic dust with low minimum ignition energy, when its concentration reaches above the lower explosion limit When the explosion occurs, tiny sparks can easily cause an explosion, especially in a confined space, a secondary explosion is more likely to occur, resulting in serious economic losses and social problems. Therefore, inerting and suppressing combustible dust explosion hazards has become an important safety prevention and control measure and development trend in the industry a...

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Problems solved by technology

Common organic dusts such as starch, wood flour, and flour all have potential explosion hazards. However, the current research on dust explosions mainly focuses on the inerting treatment and explosion suppression technology for dense dust such as coal powder, aluminum powder, magnesium powder, and titanium powder. And the inerting agent used is mainly ammonium dihydrogen phosphate, aluminum hydroxide, calcium carbonate, ammonium bicarbonate, etc. and their compound, because it is difficult to mix uniformly with combustible dust, resulting in a low explosion suppression effect; in addition, in In the industry and trade industry, especially food production and processing enterprises, it is easy to produce flammable and explosive light organic dust, such as starch, flour, etc., and there are few studies on its inertization and explosion suppression, and no inorganic silicon powder is used. Research Report on Inerting Explosion Suppression

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