Compared with the on-site batching calculation, the design calculation has the following differences: 1) The chemical composition of the raw materials should be complete and accurate, and the sum of the components should be adjusted to 100% before the calculation; 2) the sum of the ratios should be 100. %; 3) The empirical data should be reliable and the calculation should be accurate; 4) The alkalinity of the sinter should not add or add limestone to the blast furnace charge.
The alkalinity of the sinter is determined according to the slag basicity specified in the blast furnace smelting. The slag basicity of the blast furnace is mainly determined by the alkalinity of the raw materials. Under the condition that a single sinter is fed into the furnace, the alkalinity of the slag is determined by the sinter. Since the slag basicity requirement is certain, the alkalinity of the sinter should also be constant. The most ideal sinter alkalinity should be such that limestone is no longer added to the blast furnace charge, and the alkalinity of the slag meets the specified requirements. This sinter is called self-fluxing sinter. Some iron smelting plant, blast furnace burden ratio has more natural ore, limestone plus or less in order not to increase the use of high alkalinity sinter, which is also known as sinter flux of sinter.
Sintering alkalinity has the following representations:
R is the sinter alkalinity, CaO, MgO, SiO 2 , Al 2 O 3 , which is the content of each component in the sintered ore. In the case where the content of Al 2 O 3 and MgO in the raw material fluctuates little, (3) The formula indicates that the formula (1) or (2) is used only when Al 2 O 3 or MgO fluctuates greatly. For most of our sinter plants, Al 2 O 3 and MgO in the raw materials are relatively stable, so CaO/SiO 2 is used to indicate the alkalinity of the sinter.
The self-fluxing sinter alkalinity can be calculated by the following steps:
Let the alkalinity of the sinter be R
The alkalinity of the slag is R'
Mixed ore containing iron ore
Pig iron containing iron Fe pig iron %
Mixed ore containing CaO and SiO 2 as CaO ore and SiO 2 ore
Coke containing CaO and SiO 2 is CaO coke and SiO 2 coke %
Blast furnace coke ratio K kg / 100 kg pig iron [next]
1) The amount of mixed ore consumed per 100 kg of pig iron is:
This formula does not consider the consumption of SiO 2 in Si in pig iron, and does not take into account the SiO 2 brought into the sinter by limestone and coke powder. When the coke ratio is low, the error is higher when the Si content in the pig iron is higher. consider pig iron consumption alkalinity Si SiO 2, and the coke powder into the SiO 2, the sintered ore be calculated as follows:
Where K'—the number of kilograms of coke powder consumed per 100 kilograms of sintered ore;
SiO 2 coke '--- coke powder contains SiO 2 ;
A—The number of kilograms of sinter consumed per kilogram of pig iron.
For example, the alkalinity of blast furnace slag is 1.05, the iron content of Fe is 94%, and the content of Si is 0.7%. The mixed ore contains Fe of 53%, SiO 2 is 9.47%, and the coke powder per 100 kg of sinter is consumed by 7.5 kg. The coke ash is 11.38%, of which CaO is 5.32%, SiO 2 is 45.12, and the blast furnace coke ratio is 575 kg.
It can be known from (4):
It can be considered that the limestone can be added to the blast furnace charge according to the two formulas (4) and (5). The alkalinity of the sinter should exceed the alkalinity of the blast furnace slag, and the excess portion should be able to make up the lime consumed by the coke in the charge. Similarly, if there is a natural ore portion in the blast furnace charge, the excess portion should also be able to make up the lime consumed by the natural ore in the charge (the calculation unit is based on 100 kg of pig iron).
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