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Machining method of ground steel slag

The technology of steel slag powder and steel slag is applied in the processing field of steel slag powder, which can solve the problems of high grinding cost, large equipment wear and high power consumption.

Active Publication Date: 2016-11-23
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because steel slag is difficult to break and grind, the grinding efficiency is low, the power consumption is high, and the grinding cost is high. How to improve the grinding efficiency and reduce the power consumption of grinding will directly affect the comprehensive utilization level of steel slag resources.
[0003] Traditional steel slag micronization processing technologies mainly include mechanical milling (ball milling, roller milling, roller milling + ball milling) and jet milling. The former has the disadvantages of pre-drying, large equipment wear and high energy consumption; the latter has the disadvantages of Disadvantages of pre-drying, small capacity and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: steel slag powder processing method:

[0033]The molten steel slag after tapping from a steel plant is processed by the roller method. The physical and chemical properties of the raw steel slag and the processed steel slag powder are shown in Table 1. The roller slag is transported from the silo through the belt and crushed by a roller mill. After treatment, the 2.5mm sieve residue is less than 5%. After the steel slag particles are magnetically separated by a magnetic separator, the metal iron content in the steel slag is 1.5%. It is added to the pulverizer through the steam flow pulverizer inlet, and added according to the design 5t / h For steel slag pellets, use steam at a temperature of 280°C and a pressure of 0.40 MPa as the processing medium. The d50 of the steel slag powder processed through the control of the speed of the classifier is 7.5 μm, and the surface area of ​​the steel slag powder is 486m 2 / kg, 7d and 28d activity indices were 82% and 93%...

Embodiment 2

[0036] Embodiment 2: steel slag powder processing method:

[0037] The molten steel slag after tapping from a steel plant is treated by the hot-splashing method. The physical and chemical properties of the treated steel slag are shown in Table 1. The hot-splashing slag is transported from the silo through the belt and crushed by a roller mill. After treatment, the 3mm The sieve residue is less than 5%. After the steel slag particles are magnetically separated by a magnetic separator, the metal iron content in the steel slag is 1.8%. It is added to the pulverizer through the steam flow pulverizer inlet, and the steel slag pellets are added according to the designed 6t / h. Steam at 310°C and pressure 0.34MPa is used as the processing medium, and the d50 of the steel slag powder processed through the control of the speed of the classifier is 10 μm, and the surface area of ​​the steel slag powder is 448m 2 / kg, 7d and 28d activity indices are 80% and 87% respectively, meeting the r...

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Abstract

The invention provides a machining method of ground steel slag. The method includes the following steps of directly smashing raw material steel slag into a particle material with a certain particle size, selectively removing part of iron from the particle material, sending the material into a vapor stream smashing machine to be smashed, and conducting classified collecting to obtain the ground steel slag, wherein the particle size of the ground steel slag d50 is 3-15 micrometers. In smashing, the pressure of vapor used by the vapor stream smashing machine is 0.32-0.45 MPa, the temperature is 270-400 DEG C, and meanwhile CO2 gas is introduced into the vapor stream smashing machine. Bottom material tailings with total iron amount smaller than or equal to 30% are separated from a steel slag iron-rich bottom material depositing at the bottom of the vapor stream smashing machine through magnetic separation and then mixed into the steel slag particle material and then enter the vapor stream smashing machine again to be smashed. By means of the method, after-tapping fused steel slag is directly machined into the ground steel slag after being rapidly chilled without being dried; the obtained ground steel slag product is high in activity and low in free calcium oxide content; the steel slag is directly machined into a product in situ, transport cost is saved, and the machining process is simplified.

Description

technical field [0001] The invention belongs to the technical field of steel slag processing, in particular to a processing method of steel slag powder. Background technique [0002] Steel slag micronization is an important direction to broaden the utilization of steel slag and increase its added value. Steel slag micropowder can be used as a mineral admixture for cement or concrete, and can also be used as a filler for paint, glass fiber reinforced plastics, artificial marble, paper and fertilizers. When steel slag powder is used as a building material, it has wear resistance, low heat of hydration, salt-alkali corrosion resistance, and has a certain price advantage compared with slag powder. Since steel slag is difficult to break and grind, the grinding efficiency is low, the power consumption is high, and the grinding cost is high. How to improve the grinding efficiency and reduce the power consumption of grinding will directly affect the comprehensive utilization level o...

Claims

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Application Information

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IPC IPC(8): C04B5/00
Inventor 王如意张永杰向顺华陈荣欢
Owner BAOSHAN IRON & STEEL CO LTD
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