Smelting reduction is a front iron making technology for the 21st century. It can produce liquid iron by direct using common coal but not charred coal. The process has many attractive advantages such as concise flow

low investment and production cost

low environmental pollution and high quality molten iron. Combined with a reciprocal chemical technology

energy efficiency can be further improved by transforming mass coal gas

by-produced in smelting reduction

into dimethyl ether

a clean fuel. Method and characteristics of the combined technology are discussed in this paper.