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日本NKK公司利用在脱硅工序产生的脱硅炉渣，通过添加钾（K），已开发出硅酸钾肥料。这种肥料在雨水和灌水中不容易析出，在植物根部产生柠檬酸慢慢地溶解，作为缓效性钾肥的有效性已得到确认，并在日本肥料法定标准公布。目前该公司又将硅酸钾肥料生产成粒状，生产过程是在该
Japan’s NKK company using desiliconization slag generated by desiliconization process, by adding potassium (K), has developed a potassium silicate fertilizer. This fertilizer is not easily precipitated in rainwater and irrigation, and citric acid is slowly dissolved in the roots of plants. The effectiveness of the slow-acting potassium fertilizer has been confirmed and is promulgated by the statutory standards of Japanese fertilizers. At present, the company in turn potassium silicate fertilizer into granular, the production process is in the