Wastewater treatment in sulphate-route TiO2 production

• Autores: Albert Li
• Localización: Industrial Minerals, ISSN 0019-8544, Nº. 596, 2017 (Ejemplar dedicado a: Septiembre)
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Large volumes of wastewater represent both a cost and environmental burden for China's titanium dioxide industry, but new membrane filtration technology could help with water conservation and yield a suite of valuable by-products, Albert Li, IM Correspondent, finds.

    Yidu Zhang, deputy general manager of Ningbo Xinfu Titanium Dioxide Co., is something of an expert in the treatment of wastewater from titanium dioxide (TiO2) processing.

    Based in Ningbo, Zhejiang province, in eastern China, the company is a high-tech business specialising in the production of high-purity TiO2, with capacity of around 100,000 tpa.

    Speaking at the China TiO2 Industry Green Manufacturing and Application Forum in Longkou, Shandong province, earlier this year, Yidu discussed the challenges facing companies that produce TiO2 using sulphuric acid - known as sulphate-route processing.

    This process involves digesting a TiO2 feedstock (usually rutile or ilmenite) in strong sulphuric acid which converts the titanium components into titanyl sulphate and the iron into sulphates. This is then clarified to give pure TiO2.