Process for extracting metal manganese from manganese-rich slag

Abstract

The invention discloses a process method of extracting metal manganese from manganese-enriched slag. The process method comprises the steps of standing manganese-enriched slag liquid from a blast furnace, wherein as specific gravities are different, the liquid is layered, the upper layer is manganese-enriched slag liquid while the lower layer is iron liquid, and the iron liquid at the lower layer is discharged to separate iron; pouring the separated manganese-enriched slag liquid into a reaction kettle, proportioning a magnesium aluminum manganese alloy, and heating to 1500 DEG C to reduce the magnesium aluminum manganese alloy; after reacting for 1 hour, standing, wherein as specific gravities are different, the liquid is layered, the upper layer is hot slag liquid while the lower layer is manganese liquid, and the manganese liquid at the lower layer is discharged and cooled to obtain manganese. The extraction process provided by the invention is relatively simple, and the reduction rate of manganese is relatively high; during reaction, residual blast furnace gases are directly used for heating, so that the manufacturing cost is saved. On the other hand, the magnesium aluminum manganese alloy further can solve the existing problem of excess production capacity of magnesium and aluminum, so that the process method has good economic and social benefits.

Description

technical field [0001] The invention relates to a process method for extracting metal manganese, in particular to a process method for extracting metal manganese from manganese-rich slag. Background technique [0002] my country is a manganese-poor country with few manganese ore reserves, low grade and many impurities. Therefore, in the early 1980s, a large number of manganese ore enterprises came into being in my country. They used manganese ore enrichment technology to enrich manganese into slag and produce Manganese-rich slag, manganese-rich slag is widely used as an important raw material for smelting silicon-manganese alloys. [0003] With the development of the world economy and the transformation of our country's economy, the demand for silicomanganese alloys has been greatly reduced, which has led to a reduction in the demand for manganese-rich slag, and most of the enterprises that produce manganese-rich slag have closed down. Therefore, smelting the produced mangan...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a process for extracting metal manganese from manganese-rich slag, so as to overcome the shortcomings of high cost, low efficiency and large energy consumption in the existing extraction process