title: The recovery of Zn and Pb and the manufacture of lightweight bricks from zinc smelting slag and clay.
abstract: Novel lightweight bricks have been produced by sintering mixes of zinc smelting slag and clay. A two-stage sintered process has been proposed to recovery of Zn and Pb and reutilization of the zinc smelting slag. In the first stage of the process, called reduction and volatilization procedure, zinc and lead were reduced by the carbon contained in the zinc smelting slag and volatilized into the dust, and the dust can be used as a secondary zinc resource. In the second stage of the process, called oxidation sintering procedure, a lightweight brick was produced. Samples containing up to 60 wt.% zinc smelting slag and 40 wt.% kaolin clay were reduced at 1050°C for 6h, and then sintered at 1050°C for 4h. The recoveries of Zn and Pb from the brick are 94.5 ± 0.6% and 97.6 ± 0.2%, respectively. Low bulk density (1.42 g cm(-3)) and relatively high compressive strength (2 2MPa) sintered bricks were produced, and the leaching toxicity of the sintered bricks was below the regulatory thresholds of Chinese National Standards.
authors.affiliation: Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China. Electronic address: phuhuiping@126.com.
authors.forename: Huiping
authors.initials: H
authors.lastname: Hu
authors.affiliation: Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
authors.forename: Qiufeng
authors.initials: Q
authors.lastname: Deng
authors.affiliation: Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.affiliation: Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Xie
authors.affiliation: Guizhou Academy of Environmental Science and Designing, Guiyang 550002, China.
authors.forename: Zeqin
authors.initials: Z
authors.lastname: Dong
authors.affiliation: Guizhou Academy of Environmental Science and Designing, Guiyang 550002, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
mesh_terms: D019245:Compressive Strength; D003252:Construction Materials; D007220:Industrial Waste; D007616:Kaolin / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D008669:Metallurgy; D059027:Recycling / Q000379:methods; D013696:Temperature; D015032:Zinc / Q000737:chemistry*
chemical_list: D007220:Industrial Waste; D007616:Kaolin; D007854:Lead; D015032:Zinc
keywords: Lightweight brick; Oxidation sintering procedure; Reduction and volatilization procedure; Zinc smelting slag