Silicon dioxide extraction process based on highland barley husks

Abstract

The invention discloses a silicon dioxide extraction process based on highland barley husks, and belongs to the technical field of material recovery. During extraction, the process includes washing the highland barley husks with water, and drying and smashing the husks to obtain highland barley husk powder; carrying out hydrothermal carbonization reaction on the highland barley husk powder and a sulfuric acid solution, instantly releasing pressure, discharging, performing filtration, collecting a filter cake, and washing the filter cake with deionized water until a washing solution is neutral;freezing the washed filter cake with liquid nitrogen, grinding the filter cake, and unfreezing to obtain an unfrozen material; pouring the unfrozen material into a saturated ammonium nitrate solution, removing surface floaters, collecting lower-layer precipitates, and performing vacuum freeze drying on the lower-layer precipitates to obtain a refined material; putting the refined material into atubular furnace, slowly heating in an oxygen atmosphere, calcining the material, cooling and discharging to obtain a calcined material; and repeatedly washing the obtained calcined material with water, and carrying out vacuum freeze drying to obtain refined silicon dioxide, thereby completing the silicon dioxide extraction process of the highland barley husks. The silicon dioxide extraction rate is high, and the product has high purity.

Description

technical field [0001] The invention discloses a silicon dioxide refining process based on highland barley barley, and belongs to the technical field of material recovery. Background technique [0002] Highland barley is one of the most important food crops in the world. As the main by-product of highland barley processing, highland barley bark can account for about 20% of the quality of highland barley itself. Compared with traditional non-renewable resources, it has great advantages of low cost and abundant output. High-temperature barley barley produces ash after high-temperature incineration, which is rich in amorphous silica and porous carbon components. It is a renewable and clean biomass energy material with abundant yields. [0003] The silicon dioxide in the highland barley barley is an amorphous amorphous silicon dioxide, which can be dissolved by heating at high temperature under normal pressure. Therefore, the highland barley barley is a good biomass silicon so...

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is: in the process of extracting silica from barley barley at present, the process of carbonizing first and then dissolving is adopted, which not only consumes a lot of energy during the carbonization process, but also easily causes damage to the internal amorphous silica. coating, which affects the subsequent dissolution of silica, resulting in the disadvantage of reducing the yield of silica, and provides a silica extraction process based on highland barley barley