Method of treating manganese and iron manganese lean ore, there are three: First, mechanical processing, including washing, calcination, re-election, high intensity magnetic separation, flotation, roasting, etc.; Second Fire beneficiation, Hyperphosphate HSR When the refractory ore is used, the method of pyrometallurgical ore dressing is also called the manganese-rich slag method. The third is chemical beneficiation. When the quality requirements of the product components are very pure, and the above methods cannot meet the requirements, chemical purification is adopted. (chemical beneficiation) approach.
The high manganese slag method is a pyrometallurgical method. It is a high-iron high-phosphorus refractory manganese ore that cannot be directly used for smelting. It is selectively reduced in a blast furnace or an electric furnace to ensure sufficient reduction of elements such as iron and phosphorus. Under the premise, the reduction of manganese is suppressed, thereby obtaining a manganese-rich slag having a high manganese and low phosphorus and a large m(Mn)/m(Fe) ratio. This is a method of enriching manganese ore in line with China's situation. Because China's manganese-rich ore is rare, high-iron and high-phosphorus-selected manganese ore accounts for more than 40% of China's manganese ore reserves. Manganese-rich slag in China has been vigorously developing countries, providing high-quality raw materials for the production of iron alloy.
Fire method beneficiation has the following advantages compared with mechanical beneficiation.
(1) The sorting effect is good, and it can deal with various types of manganese ore, especially for the high-iron high-phosphorus manganese ore with complex structure containing phosphorus and finely dip-dyed, and ferromanganese cemented. It is difficult to obtain good indicators by mechanical selection. The manganese-rich slag method works well (see Table 1).
Table 1 Â Compare Agate Hill manganese ore index | |||||||
project | Main ingredients (%) | m(Mn) | m(P) | Manganese recovery rate /% | |||
Mn | Fe | P | m(Fe) | m(Mn) | |||
Mechanical beneficiation | Manganese oxide ore | 17.23 | 27.00 | 0.039 | 0.637 | 0.0026 | 　 |
Roasting magnetic separation | 27.13 | 11.52 | 0.038 | 2.35 | 0.0014 | 63.91 | |
Pyrolysis | Manganese oxide ore | 17.51 | 41.20 | 0.02 | 0.424 | 0.0015 | 　 |
Manganese-rich residue | 39.88 | 2.70 | 0.008 | 14.80 | 0.0002 | 85.00 | |
(2) The product quality is good, mainly containing high manganese, high manganese-iron mass ratio and low phosphorus content.
(3) Manganese recovery is high, reaching 85%~90%, which is 5% higher than mechanical beneficiation (see Table 2).
Table 2 Â Quality index of smelting manganese-rich slag in blast furnace | ||||||
Factory Name | Main ingredients (%) | m(Mn) | m(P) | Manganese recovery rate /% | ||
Mn | Fe | P | m(Fe) | m(Mn) | ||
Shanghai Iron and Steel Factory | 35~42 | 1 to 2 | 0.05 | 13~38 | 0.0015 | 81～90 |
Xiangtan Manganese Mine | 37.7 | 0.05 | 12.4 | 0.0013 | 82～88 | |
Yingkou Ferroalloy Factory | 35~37 | 1.5 | 0.005 | 24.1 | 0.0002 | 90 |
Agate Mountain Mine | 39~40 | 2.7 | 0.008 | 14.8 | 0.0002 | 85 |
Dao County Refining Plant | 36~40 | 1.5 to 3.0 | 0.008 | 13~24 | 0.0002 | 80～85 |
Donghuqiao Manganese Mine | 38~42 | 1.0 to 2.0 | 0.03 | 21~38 | 0.0007 | 80～85 |
Huangyang Sizhi Refinery | 40～45 | 1.5 to 3.0 | 0.025 | 15~27 | 0.0006 | 80～85 |
(4) The product has good physical properties, high manganese slag strength, and is not affected by environmental influences for long-term storage and long-distance transportation.
The shortcoming of high manganese slag production is that smelting consumes a lot of coke and electricity, the production cost is slightly higher, the smelting process can only remove iron and phosphorus and other non-ferrous metals, can not remove gangue, and because coke is brought into ash, it also makes The amount of impurities increases.
The main uses of manganese-rich slag are as follows:
(1) It is used as a raw material for the production of manganese-silicon alloy. When smelting manganese-silicon alloy in electric furnace, the ratio of manganese-rich slag is generally 30%~40%, and the purpose is to adjust m(Mn)/m(Fe) of manganese raw material into the furnace. And m(P)/m(Mn). Since manganese-rich slag contains high SiO 2 , it is mainly used to produce manganese-silicon alloy.
The production of high silicon manganese silicon alloy, because the manganese content in the manganese-containing raw materials is required to be greater than 40%, iron is less than 1%, and phosphorus is less than 0.03%, almost all of the manganese-rich slag can be used to smelt qualified products.
(2) For the production of manganese metal by fire method, when manganese metal is produced by electrothermal method, all manganese-rich slag is used (w(Mn)>40%, w(Fe)<1%, w(P)< 0.03%) is used as a raw material, and a high silicon manganese alloy is used as a reducing agent.
(3) Ingredients for the production of electric furnace ferromanganese and medium and low carbon ferromanganese.
(4) Ingredients for smelting blast furnace ferromanganese. (3) In item (4), m(Mn)/m(Fe) and m(P)/m(Mn) are mainly transferred to the furnace raw materials to ensure that the product quality meets the requirements.
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