A method for pre-desiliconization, pre-decarburization and pre-dephosphorization of molten iron in a molten iron tank
A molten iron tank and pre-desilication technology, which is applied in the field of steelmaking and continuous casting, can solve the problems of long processing time, rising liquid level, slow chemical reaction, etc., so as to reduce the consumption of slag-forming materials, the consumption of iron and steel materials, and the carbon content. and phosphorus content reduction, the effect of large economic benefits
Active Publication Date: 2018-02-27
ANGANG STEEL CO LTD
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Problems solved by technology
[0004] To sum up, most of the methods of pre-decarburization, pre-desiliconization and pre-dephosphorization of molten iron in molten iron tanks are carried out by spraying powder or slag. Due to the influence of slagging speed, the chemical reaction is slow and the processing time is long. , a larger temperature drop
The main reason for the difficulty in the recovery of highly oxidizing continuous casting slag is that the high oxidizing slag has a high oxidizability, which may easily cause problems such as liquid level rise and molten steel splashing in the process of hot recovery
Method used
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Embodiment Construction
[0015] This embodiment is a method for pre-decarburizing, pre-desiliconizing and pre-dephosphorizing molten iron by using ultra-low carbon IF steel casting residual steel slag. Its process is carried out in accordance with the following procedures in turn:
[0016] (1) The steel output of the ultra-low carbon IF steel converter is 260t. After casting, the remaining steel slag is 12.5t. The composition of the casting slag is as follows.
[0017] Surface casting slag composition, %
[0018] FeO
[0019] (2) First transport the empty molten iron tank to the molten iron pouring room, and fill it with 60t of molten iron. The composition and temperature of the molten iron are shown in the table below.
[0020] Composition and temperature of molten iron before surface treatment
[0021] C，％
[0022] (3) Transport the ladle containing the hot cast slag and the molten iron tank containing 60t molten iron to the molten iron treatment station, pour the hot cast slag ...
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The invention discloses a method for carrying out pre-desiliconization, pre-decarburization and pre-dephosphorization on molten iron in a molten iron tank. The method is characterized in that after molten steel casting is stopped, a steel ladle containing residual high-oxidation thermal-state casting steel slag with more than 15% (in percentage by mass) of iron oxides is transported to a molten iron treatment station; the residual thermal-state casting steel slag is poured into the molten iron tank with molten iron accounting for 10%-30% of the total weight of the molten iron which meets the converter requirements; meanwhile, 10kg-20kg of aluminum particles and 20kg-35kg of a slag melting agent are added every time 1t of the residual high-oxidation thermal-state casting steel slag is recycled, and then, molten iron is continuously added into the molten iron tank; and after the weight of the molten iron meets the converter requirements, molten iron slagging-off treatment is carried out, so that molten iron in the molten iron tank and the residual slag are added into the converter for being subjected to converting after slagging-off.
Description
technical field [0001] The invention belongs to the technical field of steelmaking-continuous casting, and in particular relates to a method for pre-desiliconizing, pre-decarburizing and pre-dephosphorizing molten iron in a molten iron tank. Background technique [0002] At present, the pre-desiliconization and pre-dephosphorization of molten iron in the molten iron tank mainly adopt the spraying method, and are generally treated by adding special molten iron desiliconization agents and dephosphorization agents. CN201010131649.9 discloses a molten iron dephosphorization agent and a method for desiliconization and dephosphorization. The molten iron dephosphorization agent is composed of the following components in parts by weight: mixed acid iron oxide powder 20% to 35%; shot blasting dust removal powder 50-60%; stainless steel steelmaking dust 14-25%, the use of chromium-nickel solid oxide in the formula can make the nickel content of molten iron at the end of dephosphorizat...
Claims
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IPC IPC(8): C21C7/076C21C7/064C21C7/068
CPCY02P10/20
Inventor 赵成林马勇廖相巍张宁张维维王丽娟
Owner ANGANG STEEL CO LTD