Production technology of preparing manganeisen from low grade manganese mine

Abstract

A production technology of preparing manganeisen from low grade manganese mine. Low grade manganese mine with a metal manganese content of 15-30% is dried, added with reducing agent, catalyst, solvent and bonding agent and mixed well to prepare a composite material; the low grade manganese mine composite raw material is placed in a rotary kiln or a tunnel kiln, heated to 400+ / -80 DEG C by energy of gas or natural gas with an air excess coefficient controlled at 0.9-1.0, with a heating speed of 1-4 DEG C / min at a normal temperature, wherein the furnace is kept in a weak reducing atmosphere, and insulated for 0.5-5 h; then the low grade manganese mine composite raw material is heated to 750+ / -80 DEG C with a heating speed of 2-5 DEG C / min and insulated for 0.5-5h; finally the low grade manganese mine composite raw material is heated to 1100+ / -150 DEG C and insulated for 0.5-6h; gas pressure in the furnace is kept at 0.12-0.15 MPa during heating and insulation; after the reaction, the material is cooled and treated with magnetic separation to obtain the manganeisen and tailings. The manganeisen comprises 15-20% of metal Fe, 65-75% of metal Mn, less than 5% of gangue, 1.0-6.5% of carbon, less than 0.15% of phosphor and less than 0.15% of sulfur, can be used as a raw material for smelting of high-quality manganeisen by a converter or an electric furnace and has low cost and wide application prospect.

Description

technical field [0001] The invention relates to a production process for preparing ferromanganese alloy from low-grade manganese ore, in particular to a production process for preparing manganese alloy with high manganese content by using manganese ore resources with low metal manganese content. Background technique [0002] At present, there are three types of ferromanganese alloy production, one is blast furnace smelting blast furnace ferromanganese, this method uses manganese raw ore with high manganese content and relatively low iron content, and the manganese ore needs to be sintered and put into blast furnace manganese ore or manganese sintering The manganese content of the ore needs to be greater than 35%. The process is very mature. The content of the blast furnace manganese, ferromanganese and manganese produced is relatively high, and the metal manganese content can be greater than 65%. Manganese ore with high content, poor resource adaptability; long process requi...

AI Technical Summary

Problems solved by technology

[0002] At present, there are three types of ferromanganese alloy production, one is blast furnace smelting blast furnace ferromanganese, this method uses manganese raw ore with high manganese content and relatively low iron content, and the manganese ore needs to be sintered and put into blast furnace manganese ore or manganese sintering The manganese content of the ore needs to be greater than 35%. The process is very mature. The content of the blast furnace manganese, ferromanganese and manganese produced is relatively high, and the metal manganese content can be greater than 65%. Manganese ore with high content, poor resource adaptability; long process requires sintering treatment, blast furnace smelting, heavy environmental load; blast furnace smelting needs to use more than saturated carbon, the carbon content in ferromanganese is high, only high-carbon or medium-carbon ferromanganese can be produced, and The silicon content is low, limited by resources and costs. At present, blast furnace ferromanganese products account for less than 10% of the market's ferromanganese alloys; Low-grade, polymetallic or non-metallic associated ore, the manganese ore resources with a manganese content of 15-30% account for more than 70% of the manganese ore resources. This part of the resources is sintered, and then part of the iron and manganese ore is separated by blast furnace, and the blast furnace is smelted Obtain pig iron and manganese-rich slag, and then use submerged arc furnace to produce manganese-rich slag into silicon-manganese alloy. The content of effective alloying elements silicon and manganese in silicon-manganese alloy can exceed 80%, which is higher than that of ferromanganese effective alloying elements. and increased by more than 10%, and resource adaptability was significantly enhanced

However, the process is long, the environmental load is huge, the production efficiency is low, the production cost is high, and the comprehensive recovery of manganese is only about 90%. Ferromanganese alloy, the production method is simple and mature, but this method uses metal manganese as the main raw material, resulting in a shortage of raw material resources, and the manufacturing process of metal manganese is complicated, the cost is high, and the environment is seriously polluted. It is a high energy consumption and high pollution industry