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Melting method for production of mineral wool from liquid blast furnace slag

A technology of blast furnace slag and slag wool, which is applied in the direction of furnaces, electric furnaces, furnace types, etc., can solve the problems of slag that is easy to cool down, viscosity, and easy to block the slag outlet, so as to shorten the conditioning period, save energy, and achieve uniform composition and temperature Effect

Inactive Publication Date: 2015-09-16
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

Although this process effectively utilizes the potential heat energy of the high-temperature melt, the equipment does not supplement the temperature during the processing, the slag is easy to cool down and the viscosity increases, and the slag outlet is easy to be blocked during the outflow process.

Method used

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  • Melting method for production of mineral wool from liquid blast furnace slag

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Embodiment Construction

[0037] The present invention will be further described below by means of drawings and embodiments.

[0038] Such as figure 1 Shown, a kind of liquid blast furnace slag provided by the invention produces the melting method of slag wool, and its operating steps are:

[0039] 1) While the liquid blast furnace slag flows into the slag tank from the launder, it is fed into the slag tank from the silo equipped with a weighing system above the launder, and a certain amount of silica powder or fly ash is added according to the capacity of the slag tank. Additives for quenching and tempering the alkaline slag of the blast furnace.

[0040] The amount of acidic additive added is added according to the following ratio:

[0041] Silica powder as SiO 2 In terms of fly ash by SiO 2 、Al 2 o 3 , CaO, and MgO, so that the composition of the liquid blast furnace slag after tempering with acidic additives is:

[0042] (SiO 2 +Al 2 o 3 ): (CaO+MgO)=1.2~1.4.

[0043] The acidic additive...

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Abstract

The present invention discloses a melting method for production of mineral wool from liquid blast furnace slag, during use of the liquid blast furnace slag for direct production of the mineral wool, an acidic additive is added into a liquid blast furnace slag tank for conditioning, the liquid blast furnace slag filled tank is heated below an electrode, an inert gas is blown on the bottom of the tank, and stirred, then the liquid blast furnace slag is poured into an electric furnace, the electric furnace is provided with the well-mixed liquid blast furnace slag with the amount of two times of the liquid blast furnace slag tank, and sustainedly heated for heat insulation; finally the furnace is opened for discharge of the slag, the furnace slag is continuously sent into a wool making machine to prepare into the mineral wool. Compared with high energy consumption of traditional cupola furnaces and kilns, by use of the process, sensible heat of the liquid blast furnace slag can be maximumly used, conditioning cycle can be shortened, meanwhile the contradiction between intermittent blast furnace slag discharge and mineral wool continuous production can be solved by the electric furnace, so that blast furnace ironmaking and mineral wool production processes can be better effectively combined to maximize economic benefits.

Description

technical field [0001] The invention belongs to the waste heat utilization of liquid blast furnace slag in the field of iron and steel production, and in particular relates to a melting method for directly producing slag wool from liquid blast furnace slag. Background technique [0002] In the "Steel Industry Adjustment and Revitalization Plan" in 2009, the country clearly put forward the goal of energy conservation and emission reduction of "nearly 100% comprehensive utilization of metallurgical slag". Therefore, the harmless and resourceful treatment of smelting waste slag is very important in my country and even in the world. The focus is also one of the central contents of promoting circular economy. [0003] During blast furnace smelting, 300-600 kg of slag is generally produced per ton of pig iron smelting. For high-quality raw materials with a grade of about 65% iron, the amount of slag can be reduced to 185-250 kg / t. In this way, the annual output of blast furnace sla...

Claims

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Application Information

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IPC IPC(8): C03B5/033C03B37/005
Inventor 袁守谦唐洋洋董洁王超李海潮刘军
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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