Novel technique and system for sending reducing gas prepared by medium/low-rank coal gasification to conveying bed for smelting in cold state

Abstract

The invention provides an ore powder reduction method and system. The ore powder reduction method comprises the following steps: reacting coal, vapor and oxygen in a gasification reactor to obtain a reducing gas containing carbon monoxide and hydrogen; reacting the reducing gas and ore powder in a conveying bed reduction reactor to obtain a reduction product and a reduction exhaust; and introducing the reduction exhaust into the conveying bed reduction reactor, including: previously mixing the reduction exhaust and the reducing gas, carrying out desulfurization and decarburization to obtain a purified gas mixture, and introducing the purified gas mixture into the conveying bed reduction reactor. The method can effectively reduce the ore powder, thereby saving the cost and obviously enhancing the reduction efficiency of the ore powder.

Description

technical field [0001] The invention relates to the field of metallurgy. Specifically, it involves a new smelting process and system for preparing reducing gas from gasification of medium and low rank coal to conveying bed. Background technique [0002] my country is rich in low-quality mineral reserves. The proven resource reserves of iron ore in the country are 61.335 billion tons, of which the basic reserves are 22.364 billion tons and the resources are 38.971 billion tons. The proven resource reserves of iron ore are 1.002 billion tons, accounting for 1.6% of the total iron ore proven resource reserves. On the other hand, my country's iron ore reserves with associated (sym)biotic beneficial components account for about 1 / 3 of the country's reserves. The associated (symbiotic) beneficial components include: vanadium, titanium, tungsten, molybdenum, cobalt, antimony, More than 30 rare and precious metals such as gold, cadmium, gallium, uranium, and thorium. This is the ma...

AI Technical Summary

Problems solved by technology

The use of existing blast furnace technology to "forcibly" smelt composite ore has resulted in a large number of symbiotic elements being wasted without rational use, and even environmental pollution. For example, about 4 billion tons of high-grade medium-high phosphorus iron ore in my country have not been utilized.

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