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Production technology of composite slagging agent for steelmaking

A production process and slag-removing agent technology, which is applied in the recycling field of steelmaking solid waste, to achieve the effect of promoting rapid melting and realizing the effect of slag removal

Active Publication Date: 2013-12-18
新疆中合大正冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above information, it can be seen that there is no case of using aluminum refractories to make converter steelmaking slag agent

Method used

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  • Production technology of composite slagging agent for steelmaking

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Production line configuration: 3 converters with an engineering capacity of 120 tons, which produce Al 2 o 3 80 tons of discarded refractory materials as the main component;

[0022] The technological process of the present invention: discarded refractory materials (aluminum-silicon carbide-carbon bricks) in steelmaking plants → crushing → grinding → adding iron ore powder pressure balls → drying → adding during converter smelting.

[0023] 1) Waste refractories (Al 2 o 3 content of 71%) to the production plant, first sort out the industrial waste and iron-containing raw materials, wait for them to cool below 30 ℃, and use the outer dimensions of 1300×1400×1400mm produced by Shandong Jiuchang Heavy Industry Technology Co., Ltd. PC0606 Jaw Crusher, broken into particles below 5 or 25 or 50mm for use.

[0024] 2) Add the crushed waste refractory particles into the Raymond mill of model 4R3216 produced by Shanghai Jianshe Luqiao Machinery Equipment Co., Ltd., and proce...

Embodiment 2

[0032] See Table 2 for the composition Wt()% (mass percentage) of waste refractories and iron ore in steelmaking ladles.

[0033] Table 2

[0034]

[0035] will start with Al 2 o 3 The waste refractories as the main component are crushed by a jaw crusher, and then ground into small particles of 2.9mm by Raymond mill, mixed with iron ore powder with a particle size of 2.9mm, and pressed into 30± 5mm spheres, added early in the converter steelmaking process.

[0036] After the above raw materials are added to the converter, under the temperature conditions in the converter furnace, the Fe in the sphere 3 o 4 Reacting with SiC and C in the middle of the refractory material, the gas and thermal expansion generated will cause the slag-removing agent sphere to break, and the main component Al in it will be broken. 2 o 3 It reacts with the components CaO and MgO in the middle of the slag material, and plays the role of slag melting and melting. The main reactions are as foll...

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Abstract

The invention provides a production technology of a composite slagging agent for steelmaking. Wasted aluminum-carborundum-carbon bricks are used and cooled to 0.5-30 DEG C, the bricks are placed in a PC0606 jaw crusher and are crushed to particles of 3-50mm, then the particles are placed in a mill of a 4R3216 Raymond mill and are machined to form powder of 0.1-3.0mm, the powder is mixed with iron ore powder of 3.0mm by the weight ratio of 41:59, the mixture is added into a forced stirring mixer for stirring and mixing, added is controlled in 15 minutes, after stirring for 15 minutes, the mixture is placed in a dry powder ball press machine for pressing, ball bodies of 30+ / -5mm are formed, and the ball bodies are dried under the temperature of 20-50 DEG C for use. The use amount of the slagging agent is 15-19kg for each ton of slag.

Description

technical field [0001] The invention relates to the recycling of steelmaking solid waste. The waste refractory material of the ladle: aluminum-silicon carbide-carbon brick is prepared into an aluminum slag reducing agent, which is applied in the converter steelmaking process to highlight economic benefits. Background technique [0002] The steelmaking process uses fluorite (calcium fluoride) as a slag agent, which can thin the thicker slag to increase the flow of slag, making it easy to desulfurize, dephosphorize, etc., but due to the corrosion of calcium fluoride in converter slag Furnace lining, cladding, and the decomposition of calcium fluoride at high temperature will inevitably produce a large amount of F - Ions, through the dust removal system of converter steelmaking, enter the cooling circulating water, causing serious pollution to the ecological environment, that is, to water resources. Moreover, the quality of ore and fluorite slag agent used for a long time is u...

Claims

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Application Information

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IPC IPC(8): C21C5/36
Inventor 吴汉元
Owner 新疆中合大正冶金科技有限公司