In the process of alkali recovery in pulp and papermaking industries, "white mud" was once considered a waste product, posing a serious threat of secondary environmental pollution. However, after nearly a decade of dedicated research, Chinese scientists and engineers have developed an innovative technology that transforms this waste into a valuable resource—calcium carbonate used as filler in paper production. This breakthrough has effectively resolved a long-standing issue related to white mud disposal in the alkali recovery process.
Recently, this advanced technology successfully passed expert evaluation organized by the Environmental Science Society under the State Environmental Protection Administration. Wang Meilin, Deputy General Manager of Beijing Watermark Environmental Protection Technology Co., Ltd., explained that the technology fundamentally eliminates the generation of waste sludge by optimizing key processes in the traditional causticization stage. In addition to recovering alkali, it also produces precipitated calcium carbonate, a crucial raw material for papermaking.
So far, the first phase of the white mud refined calcium carbonate project at Shandong MCC Yinhe Paper Industry Co., Ltd.—a project developed by the company—has been operating smoothly for nearly one year. With an investment of about 10 million yuan, the project processes approximately 10,000 tons of white mud annually. The processed material replaces purchased calcium carbonate, generating over 3 million yuan in direct annual economic benefits for the company.
Similarly, the Baihe Sewage Treatment Project of Henan Xinxiang New Asia Paper Group, currently under construction, is designed to handle 20,000 tons of white mud per year. Completed and accepted in March 2007, the facility has been running stably and efficiently. Not only does it reduce the land area required for white mud landfilling, but it also eliminates local white mud pollution. The treated white mud has fully replaced purchased talcum powder, bringing more than 4 million yuan in annual economic returns to the company.
Under China’s “Eleventh Five-Year†policy promoting energy conservation and emission reduction, this technology has received national support through a “green loan.†Investment companies are now funding paper mills that lack capital to address white mud pollution. This initiative helps these companies overcome financial barriers, allowing them to generate revenue through the technology before repaying the loan. This sustainable approach not only supports environmental protection but also enhances the economic viability of papermaking enterprises.
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