Production method of superfine slag powder

A production method and slag micropowder technology, applied in the field of building materials, can solve the problems of unstable quality, low production efficiency, low qualification rate, etc., and achieve the effects of reducing energy consumption, high production efficiency, and high qualification rate

Inactive Publication Date: 2013-11-13
NANTONG WANHAO BUILDING MATERIAL SCI & TECH
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Problems solved by technology

Most of the current production processes use ball mills to produce slag powder. This process has low production efficiency, high energy consumption, unstable quality and low pass rate.

Method used

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  • Production method of superfine slag powder

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Embodiment Construction

[0012] As shown in Figure 1, the slag enters the vertical mill after being metered. While grinding, the hot air from the fluidized fluidized furnace flows into the vertical mill. The temperature of the hot air is controlled between 230-280°C, and the slag It is crushed under the action of the pressure roller of the vertical mill, and at the same time, under the continuous drive of the centrifugal force, the slag moves to the outer edge of the grinding table, and the slag leaving the grinding table encounters the hot gas in the vertical mill and rises accordingly. The middle casing of the vertical mill enters the separator, during which the slag and the hot air have fully exchanged heat, and the water is evaporated quickly, only those particles that are enough to be carried by the wind can reach the upper separator, and then pass through the separation Powder selection by powder machine, specific surface area ≥ 400m 2 / Kg of fine powder enters the ore powder storehouse, and coa...

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Abstract

The invention discloses a production method of superfine slag powder. The production method is characterized in that slag is grinded by a vertical grinding machine and simultaneously hot gas is fed into the vertical grinding machine, wherein the slag is crushed by pressure rollers of the vertical grinding machine and is continuously driven by a centrifugal force to move towards the outer edge of a grinding disc and the slag separated from the grinding disc contacts with the hot gas in the vertical grinding machine, rises with the hot gas, passes through a middle housing of the vertical grinding machine and enters into a separator, and in the above process, the slag and the hot gas undergo heat exchange, water is fast evaporated, only the particles which can be carried by air can reach the separator at the upper part, the particles are screened by a screener, the superfine slag powder having a specific surface area greater than or equal to 400m<2>/Kg enter into a slag powder warehouse and the undesirable coarse slag powder is grinded sequentially. The production method has the advantages of high production efficiency, low energy consumption, high qualified rate and stable quality.

Description

technical field [0001] The invention relates to a production method of slag micropowder, which belongs to the field of building materials. Background technique [0002] Blast furnace slag is the industrial waste slag discharged during the blast furnace ironmaking production process. It is a molten material mainly composed of calcium silicate, which is condensed into granular matter after water quenching. Its chemical composition is mainly SiO2, CaO, Al2O3, Fe2O3, etc. Like cement clinker, it has potential hydration activity, and the activity is related to the chemical composition and the content of vitreous body produced by water quenching. However, it must be active under alkaline excitation. [0003] For a long time, slag has been mainly used by cement production enterprises, especially shaft kiln cement production enterprises, as a mixture material for accelerating the digestion of free calcium in cement clinker, reducing cement cost, and increasing cement production. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C15/00B02C23/00B02C23/08
Inventor 张志泉毛卫东杨福明
Owner NANTONG WANHAO BUILDING MATERIAL SCI & TECH
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