Blast-furnace smelting technique of low-sulfur low-manganese high-iron rich-manganese slag

Abstract

The invention relates to a smelting technique of high-iron high-phosphorus refractory deficient-manganese ores, particularly a blast-furnace smelting technique of low-sulfur low-manganese high-iron rich-manganese slag. The technique is characterized by comprising the following steps: (1) mixing low-sulfur low-manganese high-iron rich-manganese slag, coke and dolomite in a weight ratio of 78:21:1, and adding the mixture into the blast furnace via the furnace roof; (2) sending hot coal gas and hot air from a hot-blast furnace into the blast furnace via the furnace bottom to combust coke, thereby generating coal gas and releasing heat; and (3) while controlling the furnace temperature at 1250-1350 DEG C, carrying out selective reduction reaction in the blast furnace, and collecting the slag on the upper part of the furnace hearth, thereby obtaining the rich-manganese slag. The technique uses national abundant idle deficient-manganese ores and a certain proportion of imported high-manganese high-iron ores as raw materials, and regulates the operating parameters, operating system and operating means on the basis of the traditional rich-manganese slag smelting technique and pig iron smelting technique to form a novel smelting production technique of rich-manganese slag.

Description

technical field [0001] The invention relates to a smelting process of high-iron, high-phosphorus, refractory manganese-poor ore, in particular to a blast furnace smelting process of low-sulfur, low-manganese, high-iron, and manganese-rich slag. Background technique [0002] With the increasing market demand for silicomanganese alloys, the demand for low-phosphorus, low-iron, manganese-rich slag, one of the high-quality raw materials required for the production of silicomanganese alloys, has also increased significantly. There are fewer and fewer minerals for smelting to produce manganese-rich slag. In order to maintain production, we can only rely on adding a large amount of imported manganese ore, which keeps the production cost high. [0003] However, there are a large number of "dull ores" containing 1-8% manganese and 20-40% iron that cannot be used in China: the manganese content is too low to be of use value; The composition is complex, and it is mixed and associated ...

AI Technical Summary

Problems solved by technology

[0003] However, there are a large number of "dull ores" containing 1-8% manganese and 20-40% iron that cannot be used in China: the manganese content is too low to be of use value; The composition is complex, and it is mixed and associated with magnetite, hematite, and siderite, and cannot be selected and utilized

Images