高频燃烧红外吸收法快速测定低钛高炉渣中硫含量

HIGH-FREQUENCY COMBUSTION INFRARED ABSORPTION METHOD QUICKLY DETERMINES THE SULFUR CONTENT IN LOW TITANIUM BLAST FURNACE SLAG

低钛高炉渣是烧结矿石经高炉冶炼后形成的副产物,其中硫是钢中的有害元素,且硫含量的高低对高炉渣的二次利用有影响。介绍了高频燃烧红外吸收法快速测定低钛高炉渣中硫的试验方法。首先对碳硫坩埚进行高温处理,在红外碳硫仪漏气检查合格的情况下,称取(0.20±0.01)g试样于预先铺有0.3 g纯铁助熔剂的坩埚中,加入钨锡助熔剂进行样品分析。通过正交试验,确定了样品称样量(0.20 g)、纯铁助熔剂用量(0.3 g)、钨锡助熔剂用量(1.9 g)、分析时间(40 s)的分析条件。通过助熔剂加入顺序试验,确定加入纯铁、样品、钨锡助熔剂为最佳方法。采用该试验方法对低钛高炉渣实际样品中的硫进行了测定,测试结果与CSM 08 01 16 01-2005中的重量法基本吻合,相对标准偏差(RSD,n=8)为0.22%~0.60%。

Low titanium blast furnace slag is a by-product of sintered ore smelting after blast furnace smelting,in which sulfur is a harmful element in steel,and the sulfur content has an impact on the secondary utilization of blast furnace slag.The test method for rapid determination of sulfur in low titanium blast furnace slag by infrared absorption method of high-frequency combustion was introduced.Firstly,the carbon-sulfur crucible was treated at high temperature,and under the condition that the infrared carbon-sulfur meter passed the air leakage inspection,the(0.20±0.01)g sample was weighed in a crucible pre-laid with 0.3 g pure iron flux,and tungsten tin flux was added for sample analysis.Through orthogonal tests,the analysis conditions of sample weighing amount(0.20 g),pure iron flux dosage(0.3 g),tungsten tin flux dosage(1.9 g),and analysis time(40 s)were determined.Through the flux addition sequence test,it was determined that the best method was to add pure iron,sample,and tungsten tin flux.The sulfur in the actual sample of low titanium blast furnace slag was determined by this test method,and the test results were basically consistent with the gravimetric method in CSM 08011601-2005,and the relative standard deviation(RSD,n=8)was 0.22%~0.60%.