本文以干水灭火剂为研究对象，使用标准搅拌器，在不同固液配比、转速和搅拌时间下研究干水灭火剂的制备过程。通过筛分和显微镜观察，最后评选出最佳的制备条件。参照普通干粉灭火剂国内外的标准，测试了干水灭火剂的各项理化性能。用自行组装的灭火实验装置对制备出的不同粒径的干水灭火剂测试了其灭油池火的灭火性能，找出粒径与灭火性能的关系；对改性后的干水灭火剂测试灭火性能，研究改性剂对干水灭火剂灭火性能的作用；并与市售的ABC类和BC类干粉灭火剂的灭火性能进行了比较，找出影响灭火剂灭火性能的因素。 干水灭火剂的制备是用标准搅拌器，通过高速搅拌法，在不同固液配比、搅拌时间、转速等条件下制备出干水灭火剂，然后通过显微镜法和筛分法研究干水灭火剂的粒度分布。实验结果表明：制备干水灭火剂的最佳固液比是1:10，最佳搅拌时间为15s，最优转速为5000r/min。此条件下制备的产品颗粒大小均一，流动性和分散性较好，其粒径主要集中在100~300μm之间。 采用振实法测得干水灭火剂的密度在0.60～0.70g/mL之间；利用休止角法和小孔流出速度法测定了干水灭火剂的流动性，粒径在100~300μm之间的干水灭火剂流动性较好，粒径在300~400μm之间的干水灭火剂的流动性最好，<100μm或>400μm的粒径的流动性较差；所有粒径段的干水灭火剂的斥水性良好，都符合国标要求。干水灭火剂的耐压性较差，最大承受压力为1.5MPa。 实验结果显示：干水灭火剂的粉体粒度直接影响其灭火效能，粒径在100~300μm之间的干水灭火剂的灭火性能最佳；只有氢氧化镁改性后的干水灭火剂的灭火性能显著提高；通过对比试验得出，干水灭火剂的灭火时间和最小灭火剂用量明显短于ABC干粉灭火剂，与BC干粉灭火剂灭火效能相当，但是BC类灭火剂不能灭固体火灾，具有一定的局限性。因此，干水灭火剂在灭火领域具有潜在的应用前景。

In this paper, dry water extinguishing agent was prepared by using a standard blender, studying different, solid-liquid ratio, stirring speed and time. Dry water extinguishing agent was distributed by screening, and the surface morphology and particle size of the powders by electron microscopy. So the best experimental conditions were selected. The physical and chemical properties of dry water extinguishing agent were tested by general domestic and international reference standard powder extinguishing agent. The fire extinguishing properties of different size dry water extinguishing agent were tested by using experimental fire device, and the relationship between particle size and fire performance was studied; The extinguishing properties of dry water extinguishing agent after modification was tested to research the effect of modification agent on extinguishing agent performance of dry water extinguishing agent, and the factors which effect the fire extinguishing performance of dry water extinguishing agent were studied by comparing with ABC and BC powders. The experimental results showed that: the best liquid ratio was 1:10, the best mixing time was 15s, the optimal speed was 5000r/min. The particle size of product was uniformity and the dry water extinguishing agent had good flowability and dispersibility, the particle size mainly was between 100~300μm. The dry water extinguishing agent density was between 0.60~0.70g/mL by using tap water measure; The flowability was tested by the angle of repose method and determination of dry holes outflow velocity. Dry water extinguishing agent have better mobility when particle size was between 100~300μm, and dry water extinguishing agent had best fluidity when particle size was between 300~400μm. Dry water extinguishing agent had good repellency anfd was in line with the national standard for all segments of particle size. Dry water extinguishing agent had poor pressure, and the maximum pressure of 1.5MPa. Experimental results showed that: the particle size of dry powder extinguishing agent directly affected the fire performance, the fire performance was the best when particle size was between 100~300μm; The dry water extinguishing agent extinguishing performance of magnesium hydroxide was only improved significantly after modification; After contrasting the test results, The fire extinguishing time and the amount of dry water extinguishing agent was significantly shorter than ABC powder extinguishing agent, and the dry water extinguishing agent had the same fire extinguishing agent performance with BC dry powder, but the BC fire extinguishing agent cannot destroy the fire of solid, so the BC poders had some limitations. Therefore, dry water extinguishing agent had potential applications in the field of fire.