Method for preparing high-purity nano silicon dioxide from organic silicon waste contact
Through the steps of acid leaching, solid-liquid separation and titration reaction, the nano-scale silicon dioxide preparation process of organic silicon waste contacts is simplified, and the problems of complex processes and high energy consumption in the existing technology are solved, and the preparation of high-purity nano-scale silicon dioxide and effective silicon recovery are realized.
CN120081383AActive Publication Date: 2025-06-03XINJIANG INST OF ECOLOGY & GEOGRAPHY CHINESE ACAD OF SCI +1
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Patent Information
- Application Number
- CN202510271060.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2045-03-07
AI Technical Summary
Technical Problem
The prior art is difficult to effectively recover nanoscale silica in silicone waste contacts, and the process is complex, the energy consumption is high, and the product particle size is unevenly dispersed.
Method used
Through steps such as acid leaching, suction filtration, solid-liquid sodium hydroxide separation, titration reaction and drying and calcining, the process flow is simplified to prepare nano-scale silica with uniform particle size dispersion.
Benefits of technology
The preparation of high-purity nanoscale silicon dioxide is realized, the process flow is simplified, energy consumption and cost are reduced, and the recovery rate of silicon and the added value of the market are improved.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to a method for preparing nano silicon dioxide from an organic silicon waste contact body, which is used for reducing the landfill volume and the harm of hazardous wastes to the environment. The method comprises the following steps: carrying out proper pretreatment on the organic silicon waste contact, carrying out acid leaching and impurity removal by using HCl, and then directly reacting NaOH with residues to prepare Na2SiO3. In the preparation process, Na2SiO3 is used as a silicon source, NH4Cl is used as a precipitator, and the catalytic hydroxyl self-condensation of Na2SiO3 is carried out in a polyalcohol / micromolecule alcohol / polyquaternium / hydrosolvent system. The influence of the proportion of the polyalcohol, the ethanol and the polyquaternium on the particle size, the dispersity and the shape of the amorphous SiO2 nanoparticles is investigated. And finally, the silicon-containing solid waste is prepared into the spherical amorphous SiO2 nano-particles with good dispersion, the yield and the purity are high, the particle size is about 100 nm, and the particle size dispersion is uniform.
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