Instantly grinding scoria micro powder and process for manufacturing the same

A technology of slag micropowder and production process, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high cost, high grinding body consumption, low output per hour, etc., and achieves a wide range of professional applicability , Improve the overall performance, improve the effect of the use effect

Inactive Publication Date: 2004-03-17
SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, blast furnace slag has high hardness and poor grindability. The ball milling process not only has low efficiency, high energy consumption, low output per machine hour, high cost, but also serious dust pollution; when ball milling is used to make powder, steel balls, steel forgings and high-hardness slag collide with each other , the equipment wears quickly, the consumption of the grinding body is high, and it is easy to cause adverse effects such as the reduction of the whiteness of the mineral powder and the large fluctuation of the chemical composition.

Method used

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  • Instantly grinding scoria micro powder and process for manufacturing the same
  • Instantly grinding scoria micro powder and process for manufacturing the same

Examples

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Embodiment 1

[0025] The present invention adopts the blast furnace slag of Shanghai Baosteel, and after crushing by the following vertical mill process, the slag micropowder obtained has a unique chemical composition, wherein CaO is 40.83%, Al 2 o 3 14.85%, SiO 2 is 33.12%, MgO is 8.28%, and Fe 2 o 3 is 1.47%, MnO is 0.41%, and S is 0.08%. Due to the CaO and Al in the slag 2 o 3 , MgO and other active components are relatively high, and the average activity coefficient is 1.8-2.0, which makes the vertical mill slag powder have good hydration activity. Due to sufficient pulverization, 92.2% of the particle size is ≤30μm, the median diameter is 8.149μm, and the specific surface area is ≥400m 2 / kg. Using the vertical mill slag micropowder of the present invention to replace ordinary Portland cement in equal amounts can significantly improve the comprehensive performance of concrete, which is characterized by good workability, low heat of hydration, good bleeding, good resistance to ch...

Embodiment 2

[0027] An example of the production technology of the vertical mill slag micropowder of the present invention can be found in figure 1 .

[0028] (1) Raw material transportation, one-time iron removal: the blast furnace slag raw material in the blast furnace slag bin 1 passes through the conveyor 3, and then goes through the iron remover on the conveyor to remove the iron once to the top of the vertical mill 5, and then feeds it through the air lock feeding valve 4 into the vertical mill 5;

[0029] (2) Slag grinding: The slag raw material fed into the vertical mill is rolled and pulverized by the grinding rollers on the rotating grinding disc in the vertical mill 5, and at the same time is dried by the hot air provided by the hot air system 19, and the fine powder after grinding It is sent to the high-efficiency powder classifier located on the upper part of the vertical mill for sorting, and the qualified fine powder is collected by the bag filter 12; the coarse powder fall...

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Abstract

The vertically ground mineral residue fine powder has the chemical composition of CaO 39.0-40.0 wt%, Al2O3 13.0-16.0 wt%, SiO2 32.0-35.0 wt%, MgO 2-10 wt%, and small amount of MnO, TiO2, T-Fe, T-S, P2O5, Na2O, K2O, L.O.I and I.R. It is crushed fully, has specific surface area greater than 400 sq m/kg, and over 90 % of it has grain size less than 30 microns. The production process includes material conveyance, once iron elimination, grinding and storing. The vertically ground mineral residue fine powder can raise the comprehensive performance of concrete with it, and the vertical grinding process has high production efficiency, low power consumption and low production cost.

Description

Technical field [0001] The invention relates to a building material, in particular to a fine powder of slag produced by blast furnace ironmaking as a raw material through a vertical mill and a production process thereof. Background technique [0002] Blast furnace slag is the waste slag obtained by quenching and granulating the molten material mainly composed of silicate and aluminosilicate produced during the smelting of pig iron in the blast furnace. Conventionally, blast furnace slag is used as a mixing material for cement. With the rise and development of the ready-mixed concrete industry, the research on using blast furnace slag powder as an independent component of concrete has received extensive attention. The slag micropowder produced by the ball milling process has also begun to be used. However, blast furnace slag has high hardness and poor grindability. The ball milling process not only has low efficiency, high energy consumption, low output per machine hour, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/02C04B18/14
CPCY02W30/91
Inventor 蔡机敏王彩英陈云峻朱春江
Owner SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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