التفاصيل البيبلوغرافية
| العنوان: |
阳极炭渣催化脱碳制备冰晶石工艺研究. (Chinese) |
| Alternate Title: |
Study on preparation process of cryolite from anode carbon slag by catalytic decarburization. (English) |
| المؤلفون: |
张雅琪, 陈喜平, 孙宁宁 |
| المصدر: |
Inorganic Chemicals Industry; Mar2024, Vol. 56 Issue 3, p91-97, 7p |
| Abstract (English): |
Aluminum anode carbon slag is a hazardous waste，but also a high⁃value of fluorine resources，the content of cryo⁃ lite is about 70%，which has greater recycling value.In order to achieve the resource utilization and value⁃added utilization of anode carbon slag，the one⁃step roasting decarbonization process for recovering cryolite was explored.The effects of calci⁃ nation temperature，holding time，and reagent ratio on the decarburization rate of anode carbon slag were investigated by adding reaction additives for catalytic calcination.The obtained optimal experimental conditions were calcination tempera⁃ ture of 760 ℃，holding time of 2.5 h，addition of reaction additives of 5%（mass fraction），and a decarbonization rate of 97.75% under these conditions.Differential thermal analysis was conducted on the carbon slag with reaction additive of 5% and the combustion law of anode carbon slag catalyzed by adding reaction additives was obtained.As the temperature in⁃ creasing，the decomposition of crystalline water，combustion of reaction additives，combustion of carbon in carbon slag，and volatilization of electrolytes occured successively. There was no obvious carbon residue in the obtained product，and the main component was cryolite.No new impurities were introduced during the catalytic roasting process.The iron and silicon impurities in the recovered cryolite were low in content and of high quality，and could be directly returned to the electrolytic cell for recycling. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
铝电解阳极炭渣属于危废，但也是价值较高的含氟资源，其冰晶石含量约为70%（质量分数），有较大的 回收利用价值。为实现阳极炭渣的资源化增值利用，探究了一步焙烧脱碳回收冰晶石的工艺，通过在阳极炭渣中添 加反应助剂进行催化焙烧，考察了焙烧温度、保温时间、药剂配比对炭渣脱碳率的影响，得到实验最优条件：焙烧温 度为760 ℃、保温时间为2.5 h、反应助剂添加量为5%（质量分数），该条件下脱碳率达到97.75%。对添加5%反应助 剂的炭渣进行差热分析，得到了添加反应助剂催化焙烧阳极炭渣的燃烧规律，随着温度的升高先后发生结晶水的分 解、反应助剂的燃烧、炭渣中碳的燃烧及电解质的挥发。所得到的产品中未见明显的碳残留，主要成分为冰晶石且 催化焙烧过程中未引入新杂质，回收的冰晶石中铁硅杂质含量低、品质高，可直接返回电解槽循环使用。 [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |