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Method for dephosphorization treatment on molten iron by using stainless steel self-produced dedusting ash ball

A technology of stainless steel and molten iron, applied in the field of steelmaking technology, can solve the problem that dust removal cannot effectively solve and utilize self-produced waste, and achieve a good dephosphorization effect

Active Publication Date: 2013-07-24
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a method for dephosphorizing hot metal using stainless steel self-produced dedusting ash balls, so as to solve the problem that the dedusting ash produced by stainless steel making in the prior art cannot effectively solve and utilize self-produced waste question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for dephosphorizing molten iron by utilizing stainless steel self-produced dedusting ash balls, comprising the following steps:

[0031] a. According to the sequence of element reactions, desiliconization must be carried out before the dephosphorization of molten iron. At the same time, the silicon content in molten iron made by JISCO is generally 0.5-0.7%, which is a relatively high level. The molten iron is desiliconized by gas-oxygen desiliconization, and the silicon content in the molten iron is reduced to 0.1%. The temperature of the molten iron after desiliconization Controlled at 1320°C;

[0032] b. After the hot metal desiliconization treatment is completed, it starts to enter the dephosphorization treatment:

[0033] b.1. Use a spray gun to spray passivated lime powder into 1 ton of molten iron after desiliconization treatment, and the effective CaO content in the passivated lime powder is 92%. The spray gun is made of external refractory materials a...

Embodiment 2

[0037] A method for dephosphorizing molten iron by utilizing stainless steel self-produced dedusting ash balls, comprising the following steps:

[0038] a. Desiliconize the molten iron by means of gas-oxygen desiliconization, reduce the silicon content in the molten iron to 0.05%, and control the temperature of the molten iron at 1300°C after desiliconization;

[0039] b. After the hot metal desiliconization treatment is completed, it starts to enter the dephosphorization treatment:

[0040] b.1. Use a spray gun to spray passivated lime powder into 1 ton of molten iron after desiliconization treatment, and the effective CaO content in the passivated lime powder is 96%. The spray gun is made of external refractory materials and built-in steel pipes. The passivated lime powder uses nitrogen as the carrier gas and is directly sprayed into the molten iron through the built-in steel pipe. The amount of passivated lime powder depends on the target binary alkalinity CaO / SiO 2 Accord...

Embodiment 3

[0044] A method for dephosphorizing molten iron by utilizing stainless steel self-produced dedusting ash balls, comprising the following steps:

[0045] a. The molten iron is desiliconized by gas-oxygen desiliconization, the silicon content in the molten iron is reduced to 0, and the temperature of the molten iron is controlled at 1300°C after desiliconization;

[0046] b. After the hot metal desiliconization treatment is completed, it starts to enter the dephosphorization treatment:

[0047] b.1. Use a spray gun to spray passivated lime powder into 1 ton of molten iron after desiliconization treatment, and the effective CaO content in the passivated lime powder is 100%. The spray gun is made of external refractory materials and built-in steel pipes. Nitrogen is used as the carrier gas for the passivation lime powder, which is directly sprayed into the molten iron through the built-in steel pipe. The amount of passivation lime powder depends on the target binary alkalinity CaO...

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Abstract

The invention provides a method for dephosphorization treatment on molten iron by using stainless steel self-produced dedusting ash ball, so as to solve the problems in the prior art that dedusting ash produced from stainless steel production cannot be effectively resolved and that self-produced waste cannot be utilized. The method comprises the steps of desilication and dephosphorization. The main raw materials for the dephosphorization treatment of dedusting ash ball comprise passivation lime powder, dedusting ash ball and fluorite. The invention effectively solves the problem of difficult recycling of dedusting ash ball from steelmaking and reduces the smelting cost, so as to advocate green, environmental protection and recycling.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for dephosphorizing molten iron by using stainless steel self-produced dust-removing ash balls in the metallurgical industry. Background technique [0002] The amount of 400 series dust removal ash generated by stainless steel steelmaking per month should reach more than 1600 tons, and the accumulation of more recycling becomes a problem. Now a part of the dust removal ash is made into balls and used in AOD converters and electric furnaces, but only 150 tons are used per month. The amount used is far less than the amount produced, and the self-produced waste cannot be effectively resolved and utilized. [0003] The main raw material for dephosphorization in the stainless steelmaking dephosphorization area is iron oxide scale, which utilizes the FeO contained in the iron oxide scale to oxidize and dephosphorize, and the content of FeO in the dus...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C7/064C21B3/04C22B1/248
CPCY02P10/20Y02W30/50
Inventor 火兴湖
Owner JIUQUAN IRON & STEEL GRP
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