Introduce characters and applications of granulation techniques of the molten blast furnace slag in contemporary China, describe characters and design ideas of two types of granulation boxes, represent three types of circulating granulation water systems, put forward matching proposal between the molten slag granulation system and the circulating granulation water system, analyze contemporary research and problems of waste heat recovery of the molten BF slag. Since the 21th century, blast furnace process in China has been enhancing continuously, but granulation process of the molten BF slag doesn't be improved thoroughly. Engineers haven't discovered a high cost-effective process for the molten BF slag granulation, it contains simplicity, safety, reliability, low cost and high benefit. Nowadays many types of granulation processes were applied in China, screw process, INBA process and wheel-style process, but there is no consensus on best process After granulation process is determined, the granulation water system will be defined, it has three types: granulation water is directly used in slag granulation, granulation water is cooled by cooling tower to be used in slag granulation, combination of cooling water granulation and steam condensation recovery. Slag granulation system and granulation water system are variable; their rational combination is selected by comprehensively comparing different matching types. Nowadays low efficiency of waste heat recovery of the molten BF slag seriously restricts commercial operation so that it leads to substantial waste heat discharge. Problems must be resolved by improving the efficiency of waste heat recovery and the added value of by-product.
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