Chinese manganese ferroalloy production status and process

vOnly when manganese powder is very fine (-200 mesh is above 80%), and does not allow agglomeration containing residual carbon block products, use the method of plelletzing or pressure the ball. The manganese powder agglomeration exist the problems: the small scale of production, process energy consumption; less capital investment, more serious environmental pollution; only can self-sufficient, due to small, low-grade equipment and backward technology; due to the types of manganese powder is various and process requirements are different, leading complex agglomeration varieties, there are often requiring two or more kinds of agglomeration, resulting in equipment wasted and in the process of pelletizing need to add inorganic binder, which have increased the smelting energy consumption of the process and the impurities of manganese ferroalloys, has an impact on the smelting process and product quality.

Lower the P, C, S impuritiesin the alloys: With the performance requirements of the iron and steel materials improved, pure steel has become one of the important direction of developing iron and steel production, and pure steel production can not be separated from the low impurity content ferroalloy. The ferromanganese as large ferroalloy consumption in steel production, plays a pivotal role in the production of clean steel. In steel production, manganese ferroalloy is mainly in restore refining stage as a deoxidizer and alloying elements added in liquid steel, one of the main impurities in the ferromanganese phosphorus almost entirely into the molten steel, one of the limiting element of pure steel smelting. In order to produce high-quality low-phosphorus low-carbon pure steel, The requirements of the content of ferromanganese P, C, S and other impurities in the steelmaking increasingly high. In addition to manganese-rich slag smelting process can remove phosphorus, in other ferromanganese smelting process, most of the raw materials in the phosphorus were into the manganese ferroalloys, the phosphorus content in the ferromanganese mainly by the proportion of ingredients to control. Therefore, ferromanganese Dephosphorization, lowering carbon, remove silicon is a problem that deserve to concern.

Improve manganese alloy grade and purity: pure steel production promote pure ferromanganese production, improve product quality and performance requirements to meet the iron and steel industry, will increase the demands of manganese taste and purity in manganese ferroalloys. Therefore, called pure ferromanganese of Mn e 90%, Si d 1.5% C d 0.1%, P d 0.05% manganese ferroalloy. In the production of pure steel and special steel, need C d 0.1% of ultra-low carbon ferromanganese (the C and P content in low carbon ferromanganese and manganese). According to metal powder exporter, because of the higher prices of metal ferromanganese, there are some certain constraints on the use. With the development of the steel-making technology, high-quality pure ferromanganese instead of manganese metal is an inevitable trend. At present, Chinese pure ferromanganese production without a major breakthrough, there are very few manufacturers according to International Grade C d 0.12%, C d 0.14% to produce low carbon ferromanganese, the manufacturers produce pure ferromanganese is minimal. The main reason is: traditional large submerged arc furnace produce pure ferromanganese have some difficulties; Chinese produce low carbon ferromanganese furnace are basically self-baking electrode, the problems of increasing the carbon can not be solved; although manganese metal method can avoid increasing carbon, but because of their high production costs, the incremental development of its market is limited.

Source:http://www.mhcmp.com