3results 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.

The utility model relates to a compressed gas foam generating device belongs to coal mine fire prevention technical field. The utility model discloses water inlet unit, jet mixing unit, static mixing unit, foaming unit and foam output unit are sequentially communicated along the medium flow direction. The utility model adopts three -level net -like foaming structure, and the gas -liquid contact and bubble dispersion effect are strengthened gradually, and the foam expansion multiple and stability have been improved significantly, the water pressure is changed through the adjustment water inlet valve, thereby the negative pressure intensity that jet nozzle produces is adjusted, realizes the quantitative inhalation of foaming agent, makes the ratio of water and foaming agent can be accurately controlled under different working conditions, through the liquid suction of jet nozzle negative pressure and the multiple disturbance effect of static helical spoiler, make water and foaming agent fully homogeneous mixture. The foam bubble particle size distribution of the utility model finally output is even, and the structure is compact, has higher expansion degree and covering performance, can be applied to mine fire prevention and disaster emergency disposal efficiently.