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PbSO 4 Reduction Mechanism and Gas Composition at 600–1000°C
JOM ( IF 2.6 ) Pub Date : 2021-01-20 , DOI: 10.1007/s11837-020-04551-4
Yun Li , Pekka Taskinen , Yuejun Wang , Shenghai Yang , Chaobo Tang , Yongming Chen , Ari Jokilaakso

A promising lead-containing waste recycling method, with sulfur conservation and reductive sulfur-fixing co-smelting process (RSFCS), is proposed. This work investigated the PbSO4 reduction equilibrium composition, phase conversions, and microscopic transformation mechanisms during the RSFCS process at different temperatures, times, and CO-CO2 mixtures using thermodynamic modeling, thermogravimetric analysis, x-ray diffraction, and SEM-EDS analysis techniques. At the same time, the gaseous products were collected and analyzed. The results showed that three reduction paths existed: (1) PbSO4 \( \to ^{{ {\text{CO/CO}}_{{2}} }} \) PbO·PbSO4+SO2 \(\to ^{{ {\text{CO/CO}}_{{2}} }}\) 2PbO·PbSO4+SO2 \(\to ^{{ {\text{CO/CO}}_{{2}} }} \) 4PbO·PbSO4+SO2 \(\to ^{{ {\text{CO/CO}}_{{2}} }} \) PbO+SO2 \( \to ^{{ {\text{CO/CO}}_{{2}} }}\) Pb; (2) PbSO4 \( \to ^{{ {\text{CO/CO}}_{{2}} }} \) PbS; (3) PbSO4 → PbO·PbSO4+SO3 → 2PbO·PbSO4+SO3 → 4PbO·PbSO4+SO3 → PbO+SO3. Reduction temperature and CO concentration were determined as major factors in the PbSO4 reduction. In a relatively weak reductive atmosphere and at low temperature, xPbO·PbSO4 (x = 1, 2, 4), PbO, Pb, and SO2 were the major products. When temperature and the CO concentration increased, PbSO4 was selectively reduced to PbS, with sulfur in the PbSO4 fixed in PbS, instead of emitting SO2/SO3.



中文翻译:

600–1000°C下PbSO 4的还原机理和气体组成

提出了一种有前途的含铅废物回收方法,该方法具有节约硫和还原性固硫共熔工艺(RSFCS)。这项工作使用热力学模型,热重分析,X射线衍射和SEM-EDS分析,研究了在不同温度,时间和CO-CO 2混合物的RSFCS过程中,PbSO 4还原的平衡组成,相转化和微观转变机理。技术。同时,收集和分析气态产物。结果表明存在三种还原途径:(1)PbSO 4 \(\ to ^ {{{\ text {CO / CO}} _ {{2}}}} \) PbO·PbSO 4 + SO 2 \(\到^ {{{\ text {CO / CO}} _ {{2}}}} \) 2PbO·PbSO 4 + SO 2 \(\ to ^ {{{{文本{CO / CO}} _ {{2}}}} \) 4PbO·PbSO 4 + SO 2 \(\ to ^ {{{\ text {CO / CO}} _ {{2}}}} \) PbO + SO 2 \(\ to ^ {{{\ text {CO / CO}} _ {{2}}}} \\) Pb; (2)PbSO 4 \(\ to ^ {{{\ text {CO / CO}} _ {{2}}}} \) PbS;(3)PbSO 4 →PbO·PbSO 4 + SO 3 →2PbO·PbSO 4 + SO 3 →4PbO·PbSO 4 + SO 3 →PbO + SO 3。确定还原温度和CO浓度是PbSO 4的主要因素减少。在相对弱的还原性气氛和低温下,x PbO·PbSO 4x  = 1,2,4),PbO,Pb和SO 2是主要产物。当温度和CO浓度增加时,PbSO 4选择性还原为PbS,而PbSO 4中的硫固定在PbS中,而不是释放SO 2 / SO 3

更新日期:2021-01-20
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