UTILIZATION OF THE SLUDGE FROM A ZINC SMELTER IN MANUFACTURING OF BUILDING BRICKS

作者：Zhu, Yinian^*; Zhang, Xuehong; Zeng, Honghu; Liu, Huili; Liang, Yanpeng; Wang, Dan

来源：Fresenius Environmental Bulletin, 2010, 19(2): 180-189.

• brickmaking
• compressive strength
• leaching
• sludge
• toxic element

A brickmaking process was utilized to stabilize the arsenic, zinc, lead and cadmium in sludge from a zinc smelter in this study. The results indicated that the appropriate percentage of sludge content for producing quality bricks was in the range of 0-4% by weight with 20-16% addition of fly ash into a clay and coal mixture prepared in brickmaking. Under this optimum mixing condition, the compressive strength of bricks made could meet the requirements of the national standards of China for fired common brick: 10.0 MPa for a MU10-class brick. After the leaching in rainwater for 31 days, the concentrations of As, Zn and Pb leached from the bricks could not only meet the demands of the integrated wastewater discharge standard of China and the identification standard for hazardous wastes - identification for extraction toxicity of China, but also satisfy the requirement of the Class III of the national environmental quality standards for surface water of China, i.e., As<0.05mg/L, Zn<1mg/L and Pb<0.05mg/L, respectively. There was no obvious difference in leaching Cd concentrations among the bricks with and without addition of toxic sludge and fly ash in brickmaking.

• 出版日期2010
• 单位桂林理工大学