【摘要】 借助于粒度分析、显微镜鉴定、Ｘ光粉晶衍射、差热、红外光谱等方法，对同安地区沉积型粘土的粒度、矿物成分进行测试．结果表明，该粘土为以高岭石和石英为主要组合的高岭石型粉砂质粘土．粘土矿物和石英的粒级范围和变化特征都完全不同．石英开始减少即粘土矿物开始增多．工艺上的淘洗率界限以下初始粒度是石英高值区和石英－粘土矿物重叠区，要提取高纯的粘土精矿，工艺上水洗界限必须降至０．００５ｍｍ以下更多还原

【Abstract】 The grain-size distribution and mineralogy of sedimentary clay in Tong′an area have been studied using microscope , XRD, DTA, IR and sizing. The study shows that the sedimentary clay in the area is silty kaolinitic clay, containing kaolinite and quartz, but the contents of the minerals are different in different sizes. Clay minerals increase and quartzs decrease in the sedimentary clay when the grain-size of the clay goes down.更多还原