Breakthrough achieved in key technologies for the resource utilization of gasification-derived high-salt-content crystalline materials

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Breakthrough achieved in key technologies for the resource utilization of high-salt-content water from coal gasification. Author/Source: Date: 10-19-2018. Clicks: 8. Recently, the \"key technologies for the resource utilization of high-salt-content water from coal gasification\", developed jointly by Ningbo Institute of Technology, East China University of Science and Technology, and Ningxia Energy and Chemical Company, were presented at a project evaluation meeting held in Yinchuan, where they received high praise from the experts present. This technology is the result of Sinopec Ningbo Engineering Co., Ltd.’s efforts to deepen industry-university-research collaboration. It focuses on the high-salinity wastewater generated by the Ningxia Energy and Chemical Coal Chemical Project, and involves the research and development of key technologies for the resourceful utilization of such wastewater through fractional crystallization, as well as pilot-scale tests. This technological breakthrough enables the high-value conversion and utilization of inorganic salts present in wastewater; the reduction rate of mixed salts is over 96%, and the quality of all four resulting products meets **the standard requirements. This significantly enhances the technical and economic viability of this approach, granting it strong competitive advantages in terms of quality as well as substantial potential for market application. The treatment of gasification wastewater has always been a major challenge in the field of wastewater treatment, both domestically and internationally. New technologies represent the trend in the treatment of wastewater from coal chemical industries. By combining a membrane concentration system with an MVR evaporation system, energy consumption can be reduced by approximately 45%-50%. This not only helps to alleviate the pressure on companies regarding wastewater discharge but also generates earnings of 12.32–75.08 yuan per ton of wastewater. Additionally, only 3.4 kilograms of mixed salt residue are produced per ton of concentrated saltwater, which reduces the costs associated with residue treatment. As a result, near-zero discharge of wastewater from coal chemical industries is achieved, along with efficient operation of the related facilities. This technology aligns with the group company’s guiding principle of \"source control, process management, and end-stage treatment\" for high-salt wastewater. It achieves the highest salt recovery rate in China, as well as the lowest overall cost for treating high-salinity water, thereby contributing to the green development and long-term healthy growth of the coal chemical industry. Sinopec Ningbo Engineering Co., Ltd. will continue to work on optimizing and improving subsequent technologies as well as carrying out industrial-scale demonstration applications, so as to make greater contributions to truly reducing, rendering harmless, recycling, and even transforming waste from coal chemical plants into high-value products.