本文阐述了开路循环的原理,提出了应用太阳能及其它形式能量开路分解水的两个循环一改进的Fe—Cl循环和S—I循环,前者可用于在无还原性物质的条件下从赤铁矿直接生产铁;后者可以SO_2为原料连续生产硫酸,提出了两循环操作示意图,此两开路循环方法将为铁的冶炼和硫酸的生产提供具有广阔应用前景的新方法。 In this paper, the principle of open circuit is expounded and two cycles of improved Fe-Cl cycle and S-I cycle using solar energy and other forms of open circuit energy decomposition are proposed. The former can be used to recover from hematite Which can produce iron directly. The latter can continuously produce sulfuric acid with SO_2 as the raw material, and a schematic diagram of the two-cycle operation is proposed. The two open-circuit methods will provide a new method with broad application prospect for iron smelting and sulfuric acid production.