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Steel slag micro-powder with weak retarding characteristic and production method thereof

A steel slag fine powder and production method technology, applied in cement production, chemical instruments and methods, climate sustainability, etc., can solve the problems of reduced steel slag utilization rate, difficult grinding, long cement or concrete retardation time, etc.

Active Publication Date: 2021-04-20
RIZHAO STEEL HLDG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When the converter steel slag is used in the cement and concrete industries, it is necessary to grind the converter steel slag to 400m 2 After being applied to composite cementitious systems such as cement and concrete, the setting time of the composite cementitious material will be greatly increased and the strength of the composite cementitious material will be reduced. The slow setting time of cement or concrete is too long, which leads to the limitation of the application of converter steel slag in the composite cementitious system; 1. Steel slag itself has a lot of calcium, magnesium, silicon and other elements, which makes grinding of steel slag difficult and costly. This is another important reason that limits the application of converter steel slag; the application limitation of converter steel slag leads to the utilization of steel slag The rate is reduced, resulting in waste of steel slag

Method used

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  • Steel slag micro-powder with weak retarding characteristic and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] A method for producing steel slag micropowder with weak retarding properties, the specific process is as follows:

[0042] The steel slag is transferred to the slag pool by a flatbed truck, and the steel slag is digested in the slag pool. The specific process is as follows:

[0043] The steel slag is cooled in a stepped cooling method, that is, the steel slag is cut into layers from the top to the bottom, and the cut layers are gradually cooled in turn, as follows:

[0044] (1) One time fetching water: 20m 3 / h water flow rate, water fetching 30min; water fetching is carried out with the basic principle of small flow rate and slow cooling, to avoid the instantaneous vaporization and expansion of water that is easy to occur when high-temperature steel slag is used for large-flow fetching water, causing the phenomenon of air blasting; Finally, the steel slag temperature is between 400-500°C;

[0045] (2) Second water fetching: 30m 3 / h pumping flow, pumping water for 6...

experiment example 1

[0066] Use the steel slag micropowder that embodiment 1 obtains to carry out following experiment:

[0067] 1. According to the ratio of benchmark cement:steel slag powder=70:30, measure the activity index of steel slag powder, the 3-day activity index is 56%, the 7-day activity index is 63%, and the 28-day activity index is 73%;

[0068] 2. According to cement clinker: limestone: gypsum: slag powder: steel slag powder = 58.8:5.6:5.6:15:15 to prepare composite cementitious material, initial setting is 163min, final setting is 245min; steam expansion rate is 0.19%; 1 day Compressive strength 9.3MPa, 3-day compressive strength 26MPa, 28-day compressive strength 47MPa;

[0069] 3. Prepare C30 concrete according to water: cement: steel slag powder: slag powder: sand: stone = 170:240:52:108:860:1005, the initial slump is 190mm, the 7-day compressive strength is 28MPa, and the 28-day compressive strength is 39MPa .

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Abstract

The invention provides steel slag micro-powder with a weak retarding characteristic and a production method thereof. The steel slag micro-powder has a specific surface area of 300 + / -20 m <2> / kg, 45 [mu]m screen residue of more than or equal to 5%, and particle size distribution of D10 = 8.49 [mu]m, D50 = 22.59 [mu]m, D90 = 42.60 [mu]m and D99 = 60.69 [mu]m. The production method mainly comprises the steps of steel slag hot braising treatment, magnetic separation rod grinding treatment and powder selecting and grinding treatment. The production cost of the steel slag micro-powder produced by the production method is 70 yuan / ton, the machine-hour of a grinding machine is 66 t / h in the grinding process, and the production method has the advantages of low production cost and large treatment capacity.

Description

technical field [0001] The invention relates to the technical field of converter steel slag application, in particular to a micro-powder of steel slag with weak retardation property and a production method thereof. Background technique [0002] Converter slag is the waste slag produced in steelmaking, accounting for about 12-13% of steel production. With the increase of steel production in my country, the production of converter slag is also increasing. The main use of converter steel slag is to apply it to the cement and concrete industries after grinding, and to extract steel casting billets from it. [0003] When the converter steel slag is used in the cement and concrete industries, it is necessary to grind the converter steel slag to 400m 2 After being applied to composite cementitious systems such as cement and concrete, the setting time of the composite cementitious material will be greatly increased and the strength of the composite cementitious material will be red...

Claims

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Application Information

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IPC IPC(8): C04B7/147C04B7/38C04B5/00B02C15/00B02C23/14B03C1/30
CPCY02W30/91
Inventor 梁晓杰朱先胜范振鹏丁永刚赵景鑫
Owner RIZHAO STEEL HLDG GROUP
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