Manganese Iron blast furnace pig iron and blast furnace smelting operation is similar, but with the following differences ferromanganese furnace characteristics:
The content of MnO in manganese ore is lower than that in iron ore, and MnO is more difficult to reduce than FeO. During the smelting process, the amount of slag is large and the recovery rate of manganese is low.
2 Because manganese has stronger affinity with oxygen than iron, higher temperature and larger energy are needed to reduce MnO. Therefore, the smelting coke ratio of blast furnace ferromanganese is much higher than that of pig iron, and the coke load is light.
3 Due to the high coke ratio and light coke load, the particle size difference between coke and ore is large. Susceptible to developing edge airflow, airflow turbulence resulting coal, yaw easy to produce pipes.
4 The ferromanganese blast furnace has a large amount of gas and a high calorific value, resulting in a high temperature at the top of the furnace, a large dust content of the gas, and difficulty in purification.
5 furnace lining erosion is fast, the bottom of the furnace is easy to accumulate, so that the life of the lining is lower than that of the pig iron blast furnace.
The above characteristics determine that the operating system of the ferromanganese blast furnace is different from the pig iron blast furnace and has its own characteristics.
1. Loading system of blast furnace ferromanganese smelting The filling method of raw materials, fuel and flux in blast furnace ferromanganese smelting directly affects the distribution of blast furnace broken fabric layer and the distribution of rising gas flow. The blast furnace charging system includes material line, batch and loading. Material sequence and distributor working system.
(1) Feed line, that is, the distance from the lower edge to the material surface after the falling of the big bell. According to the small particle size, high density, poor rolling property, large coke particle size and good rolling property, the material line of the ferromanganese blast furnace is selected in the focus. In the following, by bounce the fabric, the ore is clothed to the edge, and the coke cloth is distributed to the center, which is conducive to the development of the central gas flow.
(2) Batch weight, which refers to the weight of each batch of ore. Small batches increase the edge, and the large batch develops the edge. According to the smelting characteristics of the ferromanganese blast furnace, the small batch is generally used to increase the edge.
(3) Loading sequence refers to the order in which the ore, coke and flux are loaded into the hopper in a batch of material. The ore is first installed as a dress (adding the edge), and the coke is first installed as a flip (development edge). In addition, there are sub-packaging, semi-dressing, and half-folding.
(4) The working system of the distributor, the use of the distributor is a measure to make the charge evenly distributed in the blast furnace section, and it can also be used to correct the unevenness of the charge and the unevenness of the gas rise. Ferromanganese blast furnaces usually use a six-point distributor cloth, that is, each batch rotates 60 degrees.
The production practice proves that the manganese iron blast furnace adopts the deep material line, the smaller batch, the formal dress or the positive sub-packing system, which is conducive to the smooth running of the furnace.
2. Air supply system The air supply system of the ferromanganese blast furnace directly affects the initial distribution of gas and the furnace condition. The determination of the air supply system is reflected in the selection of parameters such as wind pressure, air volume, air temperature and tuyere size.
In the case where the material strength is good, the particle size is uniform, and the powder is small, a large amount of wind and a small wind speed (large air outlet) can be used. On the contrary, a small air volume and a large wind speed (small air outlet) are adopted. The blast furnace volume is proportional to the blast kinetic energy. That is, the larger the volume of the blast furnace, the greater the kinetic energy of the blast. The higher the Mn content of the smelting product, the easier the furnace is to accumulate, and the blast kinetic energy required for this is also greater.
In the smelting of blast furnace ferromanganese, in order to keep the hearth active, measures should be taken to blow through the center. In addition to striving for full wind operation, high wind speeds and large blast kinetic energy should be maintained, as well as the length and angle of the tuyere to achieve this.
3. Thermal system The thermal system of blast furnace ferromanganese smelting refers to the furnace temperature level and maintenance means in smelting. The determination of the furnace temperature level should be based on ensuring the reduction rate of manganese and contributing to the reduction of the coke ratio.
The temperature of the furnace depends mainly on the utilization of coke load, wind temperature, gas heat energy and chemical energy.
The coke load is related to the manganese and iron content in the ore, the amount of slag in the smelting, the flux consumption, and the air temperature, blast furnace volume and working state. Under the premise that the above conditions are relatively stable, a suitable and stable coke load should be maintained. When the above conditions change, the coke load should be adjusted according to the change to ensure the stability of the furnace temperature.
In blast furnace ferromanganese smelting, the heat brought in by the hot air is one of the main sources of blast furnace heat. Increasing the air temperature can reduce the coke ratio and reduce the amount of gas generated, which is beneficial to the condition of the furnace. Therefore, the air temperature should be increased as much as possible under the conditions of the equipment.
4. Slag making system The blast furnace ferromanganese slag making system is related to raw material conditions. When the high-grade manganese, Mn, ratio of Fe by mass, flux can be fluxless less production of high carbon ferromanganese, when the slag of low phosphorus, low-iron slag manganese-rich, Si-Mn alloy can be used as starting materials. China's manganese ore has a low manganese content, and the domestic production of high-carbon ferromanganese by flux method is mainly based on alkaline slag operation. Slag alkalinity is generally controlled at
Production practice shows that when the MgO content in the slag is increased from 5% to 8%, the MnO in the slag is reduced from 8% to 5%. For this reason, the suitable slag composition in blast furnace ferromanganese smelting is: CaO is 30%~44%; SiO 2 is 25%~30%; MgO is 8%~12%; Al 2 O 3 is 10%~15% MnO is 3% to 7%.
The content of MnO in manganese ore is lower than that in iron ore, and MnO is more difficult to reduce than FeO. During the smelting process, the amount of slag is large and the recovery rate of manganese is low.
2 Because manganese has stronger affinity with oxygen than iron, higher temperature and larger energy are needed to reduce MnO. Therefore, the smelting coke ratio of blast furnace ferromanganese is much higher than that of pig iron, and the coke load is light.
3 Due to the high coke ratio and light coke load, the particle size difference between coke and ore is large. Susceptible to developing edge airflow, airflow turbulence resulting coal, yaw easy to produce pipes.
4 The ferromanganese blast furnace has a large amount of gas and a high calorific value, resulting in a high temperature at the top of the furnace, a large dust content of the gas, and difficulty in purification.
5 furnace lining erosion is fast, the bottom of the furnace is easy to accumulate, so that the life of the lining is lower than that of the pig iron blast furnace.
The above characteristics determine that the operating system of the ferromanganese blast furnace is different from the pig iron blast furnace and has its own characteristics.
1. Loading system of blast furnace ferromanganese smelting The filling method of raw materials, fuel and flux in blast furnace ferromanganese smelting directly affects the distribution of blast furnace broken fabric layer and the distribution of rising gas flow. The blast furnace charging system includes material line, batch and loading. Material sequence and distributor working system.
(1) Feed line, that is, the distance from the lower edge to the material surface after the falling of the big bell. According to the small particle size, high density, poor rolling property, large coke particle size and good rolling property, the material line of the ferromanganese blast furnace is selected in the focus. In the following, by bounce the fabric, the ore is clothed to the edge, and the coke cloth is distributed to the center, which is conducive to the development of the central gas flow.
(2) Batch weight, which refers to the weight of each batch of ore. Small batches increase the edge, and the large batch develops the edge. According to the smelting characteristics of the ferromanganese blast furnace, the small batch is generally used to increase the edge.
(3) Loading sequence refers to the order in which the ore, coke and flux are loaded into the hopper in a batch of material. The ore is first installed as a dress (adding the edge), and the coke is first installed as a flip (development edge). In addition, there are sub-packaging, semi-dressing, and half-folding.
(4) The working system of the distributor, the use of the distributor is a measure to make the charge evenly distributed in the blast furnace section, and it can also be used to correct the unevenness of the charge and the unevenness of the gas rise. Ferromanganese blast furnaces usually use a six-point distributor cloth, that is, each batch rotates 60 degrees.
The production practice proves that the manganese iron blast furnace adopts the deep material line, the smaller batch, the formal dress or the positive sub-packing system, which is conducive to the smooth running of the furnace.
2. Air supply system The air supply system of the ferromanganese blast furnace directly affects the initial distribution of gas and the furnace condition. The determination of the air supply system is reflected in the selection of parameters such as wind pressure, air volume, air temperature and tuyere size.
In the case where the material strength is good, the particle size is uniform, and the powder is small, a large amount of wind and a small wind speed (large air outlet) can be used. On the contrary, a small air volume and a large wind speed (small air outlet) are adopted. The blast furnace volume is proportional to the blast kinetic energy. That is, the larger the volume of the blast furnace, the greater the kinetic energy of the blast. The higher the Mn content of the smelting product, the easier the furnace is to accumulate, and the blast kinetic energy required for this is also greater.
In the smelting of blast furnace ferromanganese, in order to keep the hearth active, measures should be taken to blow through the center. In addition to striving for full wind operation, high wind speeds and large blast kinetic energy should be maintained, as well as the length and angle of the tuyere to achieve this.
3. Thermal system The thermal system of blast furnace ferromanganese smelting refers to the furnace temperature level and maintenance means in smelting. The determination of the furnace temperature level should be based on ensuring the reduction rate of manganese and contributing to the reduction of the coke ratio.
The temperature of the furnace depends mainly on the utilization of coke load, wind temperature, gas heat energy and chemical energy.
The coke load is related to the manganese and iron content in the ore, the amount of slag in the smelting, the flux consumption, and the air temperature, blast furnace volume and working state. Under the premise that the above conditions are relatively stable, a suitable and stable coke load should be maintained. When the above conditions change, the coke load should be adjusted according to the change to ensure the stability of the furnace temperature.
In blast furnace ferromanganese smelting, the heat brought in by the hot air is one of the main sources of blast furnace heat. Increasing the air temperature can reduce the coke ratio and reduce the amount of gas generated, which is beneficial to the condition of the furnace. Therefore, the air temperature should be increased as much as possible under the conditions of the equipment.
4. Slag making system The blast furnace ferromanganese slag making system is related to raw material conditions. When the high-grade manganese, Mn, ratio of Fe by mass, flux can be fluxless less production of high carbon ferromanganese, when the slag of low phosphorus, low-iron slag manganese-rich, Si-Mn alloy can be used as starting materials. China's manganese ore has a low manganese content, and the domestic production of high-carbon ferromanganese by flux method is mainly based on alkaline slag operation. Slag alkalinity is generally controlled at
Production practice shows that when the MgO content in the slag is increased from 5% to 8%, the MnO in the slag is reduced from 8% to 5%. For this reason, the suitable slag composition in blast furnace ferromanganese smelting is: CaO is 30%~44%; SiO 2 is 25%~30%; MgO is 8%~12%; Al 2 O 3 is 10%~15% MnO is 3% to 7%.
3 In 1 Servo Feeders is in the short space design were especially developed to meet the needs of customers with not enough space. They offer process reliability even for the most demanding materials. They are optimally suited for the manufacture of structural parts as well as for processing of high-strength materials - even for the higher ranges of strip thickness.
By combination of straightener and roll feed into one machine, so called feeder-straightener, which is positioned directly at the press, the needed space for material loop of straightened material can be saved.
The feeder-straightener is supplied with material out of a (in comparison) very small loop of not straightened material below the Decoiler.
The decoiler is equipped with a variable speed drive as well as with a very sensitive loop control. By this way it is assured that there always will be enough material available for supply of the feeder-straightener.
In case that feeding lengths and stroke rates do require a bigger material stock within the material loop, the Coil Feeding Line will be completed with a loop pit.
Mayflay Auto Feeder 3 In 1 is suitable for all kinds of automobile stamping, appliances manufacturing, computer and electronic componets, hardware and metal parts etc industry.
3 In 1 Servo Feeders
4 in 1 Straightener Feeders, Sheet Metal Feeding Equipment,Uncoiler System Feeder Straightener, 3 in 1 press feeding, Cradles & Levelers,Decoiler Leveler Feeder
Mayflay Machinery(huizhou) Co.,LTD , https://www.pressfeeders.com