基于水泥窑协同处理石灰干化污泥工艺研究磷、硫对碳酸钙分解的影响

针对水泥窑协同处理石灰干化污泥工艺,利用热差分析仪、X射线衍射和扫描电子显微镜分别从碳酸钙分解热力学和碳酸钙微观演变的角度研究了不同量的磷和硫掺比对碳酸钙分解的影响规律.实验结果表明,在碳酸钙烧制中,掺加0.5%的磷(以磷酸钙计)和硫(以硫酸钙计),使碳酸钙表观分解能分别降低了7.35%和8.04%,峰值温度分别降低了70.82℃和59.32℃,有效促进碳酸钙的分解;对其促进机理研究发现,硫酸钙、磷酸钙及其分解产物焦磷酸钙自身并不与碳酸钙及其分解产物氧化钙发生反应,他们仅破坏了碳酸钙的表面结构,促进了二氧化碳的释放,从而利于的碳酸钙分解.本研究结果表明,掺加一定量的石灰干化污泥引入磷和硫,利于水泥熟料的烧成.

Effects of Municipal Sewage Sludge on Fixation of Cr,Ni,Cu,and Zn during Co-processing of Heavy Metal-containing Waste in Cement Kilns

Cement raw meal with MSS and different heavy metals was blended to examine the fixation ratios, chemical species, and cement crystalline phases in clinkers. The results showed that blending MSS could decrease the fixation ratio of Cr, Ni, Cu, and Zn in the produced clinker by 5% to 25%. And Cr, Cu, and Zn were mainly incorporated into clinkers as metal silicates, Ni was mainly solubilized in Mg O to form magnesium nickel oxides, and the transition phases were mainly metal aluminum oxides as indicated by X-ray diffraction. The reduction of fixation ratios was likely attributed to the presence of impure elements, such as sodium and phosphorus in MSS. In addition, high concentrations（eg, 1.7 wt%） of chlorine in MSS led to metal chloride formation that could vaporize Cu, Cr, Ni, and Zn. To summarize, introducing MSS would decrease the fixation ratios of heavy metals due to the presence of impure elements, such as sodium and phosphorus and chlorine.

高频红外法测定铁铬铝纤维中碳硫含量

采用高频燃烧红外吸收法对铁铬铝纤维中的碳、硫含量进行了研究。确定了LECO CS230最佳的分析条件,分析功率为最大功率的75%,称样量为0.4～0.5 g,以钨为助熔剂,用量为1 g,在此条件下,碳的分析结果为相对标准偏差≤5%,硫的标准偏差≤10%,能获得稳定的分析结果。

ON736氧氮测定仪测定铜铬合金中氧氮含量

应用LECO ON736氧氮测定仪测定铜铬合金中氧、氮含量,讨论了标样选择、分析功率、表面处理对测定结果的影响。考察了试验方法的精密度,采用优化条件分析了不同牌号的铜铬合金,氧测定结果的相对标准偏差为3.8%~4.2%,氮测定结果的相对标准偏差为4.3%~5.6%。加入钛合金标准样品进行了回收实验,结果表明,氧和氮的回收率分别为94%~105%和93%~103%。

冷凝除湿技术在新沟河水利枢纽的应用

讨论了电气设备在高湿度环境下,产生凝露的危害。尝试提出解决问题的办法,通过实测"冷凝除湿装置"并收集、分析相关数据,为水利工程在潮湿环境中电气设备可靠运行提供技术参考。