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Method for preparing high-activity powder by using dry blast furnace slag

A blast furnace dry slag and powder preparation technology, applied in the direction of process efficiency improvement, recycling technology, etc., can solve the problems of ineffective excavation of blast furnace dry slag, insufficient crushing of dry slag, and insufficient utilization, so as to save raw material consumption , Improve the strength, corrosion resistance and durability, and realize the effect of resource recycling

Inactive Publication Date: 2012-04-18
韶关市柏林再生资源开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technological process is "electromagnetic rough separation → crusher crushing → secondary magnetic roller magnetic separation → high temperature reduction in smelting furnace → water quenching treatment". This method only extracts the iron element in the dry slag, and other effective components that can be used as cement mortar are not. Fully utilized, and due to insufficient dry slag crushing, dry slag blocks of different shapes and sizes are not effectively screened, resulting in low reduction degree, and the reduced waste slag is used for brick making and paving, which affects the performance of bricks , more importantly, this kind of grinding production cannot effectively tap the potential of blast furnace dry slag, resulting in a great waste of resources

Method used

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  • Method for preparing high-activity powder by using dry blast furnace slag
  • Method for preparing high-activity powder by using dry blast furnace slag

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: The blast furnace dry slag that contains a certain amount of moisture is first crushed, and then enters the magnetic separation belt conveyor, and the dry slag after magnetic separation of metal iron enters the elevator, and is transported into the drum screen, and the particles are screened. The dry slag with a diameter greater than 10 mm is returned to the ultra-fine crusher for re-crushing, and the particle size is less than 10 mm and directly enters the finished product warehouse, and the dry slag enters the dryer through a vibrating feeder, and the dry slag with a moisture content of less than 2.0% is mixed with The dust-laden water vapor in the ventilation system of the dryer passes through the dust collector, and the collected dust is mixed into the hoist and transported to the finished product warehouse;

Embodiment 2

[0019] Embodiment 2: The dry slag in the finished product warehouse is measured by a belt scale, and the composite activator and activator in the storage tank enters the ball mill at the same time. After grinding, the dry slag is transported to the powder separator through the elevator, and the qualified powder is directly transported to the finished product warehouse. The unqualified coarse powder is sent back to the first-level ball mill and the second-level ball mill for grinding. At this time, the qualified powder reaches 99.5% and is transported to the finished product warehouse;

Embodiment 3

[0020] Embodiment 3: The patent of the present invention can also be implemented on the basis of Embodiment 1: the dry slag powder in the finished product warehouse is measured by a screw feeder, sent into a high-fine ball mill, added grinding aids and activators, and ground to obtain a specific surface area ≥500㎡ / kg powder enters the elevator and transports to the finished product warehouse, the dust collector of the ventilation system of the high-fine mill, and the induced draft fan is discharged into the atmosphere, and the collected dust enters the air chute, and is sent to the finished product warehouse by the blower;

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Abstract

The invention provides a method for preparing high-activity powder by using dry blast furnace slag. The method comprises the following steps of: crushing the slag, screening, performing magnetic separation, drying, performing primary pulverizing (adding a pulverizing aid) and secondary pulverizing (adding a pulverizing aid and an active agent), selecting the powder, discharging, and thus obtaining the high-activity powder. The physical and mechanical properties of the high-activity powder totally meet the requirements of cement mortar and concrete aggregate; and the method has the characteristics of achieving high resource recovery rate, saving the consumption of raw materials, reducing environmental pollution caused by the dry slag and realizing resource recycle.

Description

technical field [0001] The invention relates to a preparation method of blast furnace dry slag, in particular to a preparation method of high activity energy powder of blast furnace dry slag. Background technique [0002] Blast furnace dry slag is the waste produced in the process of smelting pig iron in the blast furnace, that is, it is slowly cooled in the air or cooled by pouring an appropriate amount of water to form denser massive hard slag. Blast furnace dry slag is processed, rolled, crushed, and sieved into different particle sizes. It can replace sand and stone as construction aggregate, and can be used as cement mortar and concrete aggregate to increase the utilization value of dry slag and realize the resource utilization of dry slag. [0003] In the current blast furnace ironmaking process, a large amount of dry slag with a temperature between 1300°C and 1500°C is often discharged. The dry slag particles are not uniform, and most of them exist in the form of lump...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C04B5/00
CPCY02P10/20Y02W30/50
Inventor 余柏林
Owner 韶关市柏林再生资源开发有限公司
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