Method for preparing high-class concrete admixture with composite powder of steel slag and mineral slag

Abstract

The invention discloses a method for preparing a high-class concrete admixture with composite powder of steel slag and mineral slag and belongs to the fields of solid waste resource utilization and building materials. A novel crushing machine with a high-efficiency deironing function, a vertical mill with a high-efficiency circulation deironing function or a rolling mill with the high-efficiency circulation deironing function, and a tubular mill with the high-efficiency circulation deironing function are connected in three stages in series, so that the powder mill equipment can take the synergistic and real-time circulation deironing and low-energy-consumption low-cost superfine milling in the granulated blast-furnace slag and steel slag powder milling process are achieved. In the product, steel slag micro powder accounts for 20-50%, the mineral slag micro powder accounts for 35-65%, the flue gas desulfurization gypsum micro powder accounts for 5-15%, and the specific surface area of the product is 630-750m<2> / kg. Due to the synergetic stimulation effect of the granulated blast-furnace slag micro powder, the steel slag micro powder and the flue gas desulfurization gypsum, the ratio of the admixture in a concrete gel material can be up to 60-100%, and ordinary-strength and high-property concrete, high-strength and high-property concrete and super-high strength and high-property concrete with C40-C100 can be prepared. By adopting the method, the production of high-property concrete is greatly improved, the energy is saved, the emission is reduced, and the cost is lowered.

Description

Technical field [0001] The invention belongs to the field of solid waste resource utilization and building materials, and relates to a preparation method of steel slag and slag composite powder advanced concrete admixture. technical background [0002] Steel slag is currently one of the worst bulk solid wastes used by iron and steel enterprises. Except for the extraction of some metallic iron, most of it has not been effectively utilized. There are still about 3% residual metallic iron in the steel tailings of most steel plants after full selection of iron, and contain higher divalent metal ions than cement clinker. my country's annual output of steel slag is nearly 100 million tons, and the utilization rate is less than 30%. Decades of accumulation and stockpiling have formed a huge Ca-Mg-Fe resource pool. However, in converter steel slag (SiO 2 +Al 2 o 3 ) / (CaO+MgO+FeO) ratio is very low, generally lower than 0.15. Therefore, if the converter steel slag is ground into...

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Problems solved by technology

[0007] The invention relates to a preparation method of steel slag slag composite powder advanced concrete admixture, the purpose of which is to solve the problem in the prior art that the potential of granulated blast furnace slag powder to provide active silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron cannot be fully utilized, and to solve In the prior art, it is impossible to give full play to the potential of steel slag micropowder to provide a large amount of divalent metal cations, and to solve the problem in the prior art that gypsum cannot fully play the role of forming ettringite minerals, thereby fully stimulating the activity of slag and steel slag

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