SU425956A1 - METHOD OF MELTING METAL MANGANESH Oj'iudLr I.1 - Google Patents

Description

one

The invention relates to the field of metallurgy, in particular, to the smelting of manganese metal in an electric furnace.

There is a known method of smelting manganese metal by charging a mixture of low-phosphorus manganese concentrate, advanced manganese silicate and lime into an electric furnace, melting and tapping of metal and slag.

Such a technological scheme for smelting manganese metal has a number of significant drawbacks: a relatively high specific power consumption, a high slag ratio, a low extraction of the leading element into the alloy and its considerable loss with waste slag.

The existing process of smelting manganese metal, as a whole periodic process, has a relatively low productivity. In addition, the periodicity of the process adversely affects the durability of the furnace lining.

A distinctive feature of the proposed method is that the smelting is performed on jointly agglomerated components of the mixture, heated to a temperature of 500-600 ° C, with their continuous loading into the furnace.

This difference makes it possible to increase metal recovery, furnace productivity and durability of its lining.

The essence of the method is as follows.

For smelting manganese metal, a mixture consisting of low-phosphorus manganese concentrate, advanced manganese silicate and lime is used. The components of the mixture are crushed together to a fraction of 1-O mm and briquetted. The agglomerated mixture, heated to a temperature of 500-600 ° C, with moisture removal and reduced power consumption, is continuously loaded into the furnace and smelted, followed by the release of metal and slag.

Example. Melting is carried out in a 50 kW three-phase furnace. The following materials are used as charge materials: manganese concentrate of the dithionate enrichment method (Mn - 50%, P - 0,017%, SiOa - 1.25%, CaO - 9.8%, Fe - 0.5%), pigment manganese (Mn - 65%, Si - 29%, P - 0.04%) and lime (CaO - 92%).

The composition of the charge for the manufacture of briquettes

next,%:

43.5

Manganese Concentrate Concentrate

splico manganese 30,4

Lime26.1

The components of the mixture are ground together in a ball mill, moistened to a moisture content of 5–10% and briquetted in a roller press.

at specific pressure of pressing 500 kg / cm. The resulting briquettes are dried at 250-300 ° C, heated to 500-600 ° C and continuously loaded into the oven. The smelting process is continuous, i.e., the furnace bath is constantly filled with briquettes and as they melt, new briquette portions are loaded. Metal and slag are released every 30-40 minutes.

As a result, it was established that in the smelting of manganese metal by a continuous process at the briquetted charge, the extraction of manganese and the use of silicon increase by 5.7% and 10.4%, respectively.

The slag ratio decreases by 2.36 times, the specific power consumption decreases.

by 20.3%, and the capacity of the electric furnace is increased by 17.8%.

Subject invention

The method of smelting manganese metal by loading into the electric furnace a mixture of low-phosphorus manganese concentrate, advanced manganese silicate and lime, melting and ejection of the metal and slag, which is the case with the metal extraction enhancement slot , furnace productivity and durability of its lining, smelting is carried out on jointly agglomerated components of the charge, heated to a temperature of 500-600 ° C with their continuous loading into the furnace.