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炉渣中硫的存在限制了其在冶金流程内循环利用。为了实现含硫废渣的再生利用,提出“两段式”氧化焙烧脱硫工艺。热力学计算表明,随着焙烧温度升高及体系氧分压降低,焙烧产物CaO稳定区域增大。因此,氧化焙烧应尽可能保证较高的温度和较低的氧分压。最佳两段式焙烧工艺为:第一阶段,900℃时,CaS在空气气氛下焙烧180 min;第二阶段,1 100℃惰性气氛下焙烧40 min。经两段式焙烧处理后,工业含硫渣硫含量可由0.8%降至0.23%,脱硫率约为71.25%,基本可以达到循环利用水平。
The presence of sulfur in the slag limits its recycle within the metallurgical process. In order to achieve the recycling of sulfur-containing waste, proposed “two-stage ” oxidation roasting desulfurization process. Thermodynamic calculations show that as the calcination temperature increases and the system partial pressure of oxygen decreases, the stable area of calcined product CaO increases. Therefore, roasting should be as high as possible to ensure a higher temperature and lower oxygen partial pressure. The best two-stage roasting process was as follows: In the first stage, CaS was roasted at air temperature for 180 min at 900 ℃; in the second stage, roasted at 100 ℃ for 40 min under inert atmosphere. After two-stage roasting process, sulfur content of industrial sulfur residue can be reduced from 0.8% to 0.23% and desulfurization rate is about 71.25%, which can basically reach the level of recycling.