2results about How to "High expansion factor" patented technology

The invention belongs to the technical field of graphite preparation, and particularly relates to expandable graphite without waste acid discharge as well as a preparation method and application thereof. The preparation method comprises the following steps: stirring and mixing a graphite raw material and recycled sulfuric acid for pretreatment, then adding hydrogen peroxide into the mixture, and carrying out oxidation intercalation reaction at room temperature to obtain a reaction product; carrying out solid-liquid separation on the reaction product to obtain filtrate and a solid product; filtrate is used as recycled sulfuric acid for a pretreatment process; the solid product is sequentially subjected to washing, drying and high-temperature expansion treatment, and the expandable graphite is prepared. According to the method, the core problems of high consumption of sulfuric acid and serious waste acid pollution in the production of the expandable graphite are solved from the source, the raw material and wastewater treatment cost is remarkably reduced through efficient resource recycling, and an economical, feasible and environment-friendly green production process path is provided for the industry.