摘要：

铝型材的表面处理工序会产生大量废水。废水经中和调节、絮凝沉淀、压滤处理后产生铝型材加工污泥。此类污泥含有较多的氯、硫等杂质，无法直接应用，需进行除杂预处理。研究发现，碳粉与污泥在高温下反应，可将污泥中的硫酸钙还原为硫化物，从而降低污泥的含硫率。热力学分析表明，碳粉可以降低污泥中CaSO₄的分解温度，且CaSO₄与碳粉反应优先生成CaS。CaS在常温下能被氧气氧化为SO₂而被去除。系统考察了脱硫工艺条件如焙烧温度、碳泥质量比、焙烧时间，结果表明，优选脱硫工艺条件为焙烧温度900℃、碳泥质量比0.12、焙烧时间60 min。在此条件下污泥脱硫率为88.30%，含硫率为0.30%。

关键词: 铝型材, 污泥, 硫酸钙, 脱硫

Abstract:

The surface treatment process of aluminum profile produces a large amount of wastewater. After the wastewater was treated by neutralization, flocculation, sedimentation and pressure filtration, the aluminum profile sludge was formed. The sludge contained impurities such as chlorine and sulfur, which cannot be used directly and needs to be pretreated for impurity removal. It was found that the reaction of carbon powder with aluminum profile sludge at high temperature could reduce the calcium sulfate in the sludge to sulfide, thus reducing the sulfur content in the sludge. Thermodynamic analysis showed that carbon powder could reduce the decomposition temperature of CaSO₄, and that CaSO₄ reacted with carbon powder to preferentially generate CaS, which could be oxidized to SO₂ by oxygen at room temperature and removed. The desulfurization process conditions were systematically investigated, such as the roasting temperature, the mass ratio of carbon powder to sludge, and the roasting time. The results showed that the optimal desulfurization process conditions were the roasting temperature of 900℃, the mass ratio of carbon powder to sludge 0.12, and the roasting time of 60 minutes. Under these conditions, the sludge desulfurization rate was 88.30%, and the sulfur content was 0.30%.

Key words: aluminum profile, sludge, calcium sulfate, desulfurization

中图分类号: 

• TU992.3