Assessment of the Integrity and Retention of Chromium (VI) in Portland Cement Pastes

• 作者: Ferreira Raul Tadeu Lobato Fortaleza Dário Batista Amorim Kelly Aparecida da Encarnação Lira Fernanda Silva Silva Marizete Helena Pereira Wagner Batista Santos
• 来源期刊: 化学工程与科学期刊(英文)
• 学科: 工学
• 关键词: WASTES Solidification-Stabilization CHROMIUM SOLUBILIZATION
• 年，卷（期）: 2021,（1）
• 页码范围: 1-17
• 页数: 17页
• 分类号: TG1

摘要

Chromium is a heavy metal used for various applications such as in the manufacture of stainless steels, in chemicals for wood treatment, in tanneries, and in the refractory industry. The main problem associated with the use of chromium in these activities is the considerable volume of contaminated effluent that requires treatment, mainly due to its high mobility and toxicity in its hexavalent form. Immobilization methods arise as an efficient solution for the treatment of these wastes through converting them into inert and stable materials. The present paper aims to investigate Portland cement II’s paste properties with potassium dichromate addition in order to verify the chromium immobilization process. Analyses of moisture content, water absorption, axial compressive strength, and solubilization were done in samples at 7 and 28 days with 0%;0.5%;1.05;1.5%;2.0% and 2.5% potassium dichromate addition. The results showed the influence of this salt in cement hydration reactions, damaging the mechanical behavior and the water absorption capability of the material produced. In the solubilization test, all compositions had >99% efficiency of chromium immobilization in both ages of hydration, thus demonstrating the capability of a cementitious matrix to stabilize this metal.