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概述了磷铵喷浆造粒“三内”技术（内返料、内分级、内破碎）在复肥生产中的研究开发和工业应用情况，提出了今后“三内”技术的研究方向。
The research development and industrial application of “three internal” technology (inner material return, internal classification and internal crushing) in the production of compound fertilizer are summarized. The future research directions of “three internal” technologies are put forward.