Articles
  • Acidic treatment of sodium sulfide by-product sediment to recover sodium oxide and preparation porous ceramics for building applications

  • Changrong Liua, Hongbin Tana,b,*, Aiguo Zhengc, Xiangmei Kangc, Ao Jiangc, Rui Fanga, Haorong Rena and Wanwei Fangd

  • aState Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang Sichuan 621010, China
    bShaanxi Engineering Center of Metallurgical Sediment Resource, Shaanxi University of Technology, Hanzhong Shaanxi 723000, China
    cDeyang Rail Co., Ltd. of Chengdu Railway, Deyang Sichuan 618007, China
    dXinjiang Changji Construction Group, Changji Xinjiang 831100, China

Abstract

The manufacture of sodium sulfide through a carbon reduction process, using sodium sulfate as raw material, generates sodium sulfide by-product sediment, which has potential health and environmental impacts. Herein, a novel strategy is proposed to recover sodium oxide from the sediment by using acidic treatment and the influence of solution pH on sodium oxide content is systematically studied. The results reveal that the sodium oxide content decreases with decreasing pH value of the solution. At pH = 4, the as-treated sediment results in Na2O content of 3.10 wt. %, which recovery rate is about 90%. Furthermore, the influences of sintering temperature and time on compressive strength and bulk density are studied. In general, the compressive strength and bulk density increase with increasing sintering temperature and time. After sintering at 1,300 oC for 120 min, the compressive strength and bulk density of the sintered porous ceramic are 26.66 MPa and 1.31 g/cm3, respectively. The porous ceramic, sintered at 1,300 oC, mainly consists of hauyne, gehlenite and hematite phases. In summary, the few flaws in cell-walls result in high compressive strength of the as-prepared porous ceramics.


Keywords: sodium sulfide, alkaline sediment, acid treatment, porous ceramic, waste utilization

This Article

  • 2020; 21(3): 365-370

    Published on Jun 30, 2020

  • 10.36410/jcpr.2020.21.3.365
  • Received on Nov 10, 2019
  • Revised on Apr 10, 2020
  • Accepted on Apr 14, 2020

Correspondence to

  • Hongbin Tan

  • aState Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang Sichuan 621010, China
    bShaanxi Engineering Center of Metallurgical Sediment Resource, Shaanxi University of Technology, Hanzhong Shaanxi 723000, China
    Tel : +86 816 2419201
    Fax: +86 816 2419201

  • E-mail: hb-t@163.com