High-strength double-doped mineral powder

Abstract

The invention discloses high-strength double-doped mineral powder and belongs to the technical field of metallurgical environmental protection. The high-strength double-doped mineral powder is prepared from the ingredients in percentage by weight: 50% to 80% of steel slag, 20% to 40% of blast-furnace slag powder, 0% to 3% of gypsum powder and 0% to 17% of white slag, wherein the double-doped mineral powder has the density of 3.0g / cm<3> to 3.1g / cm<3>, the moisture content of not higher than 1%, the free CaO content of lower than 3%, the fluidity ratio of not lower than 97%, the activity index of not lower than 75%, the specific surface area of not smaller than 400m<2> / kg, the SO3 content of not higher than 4% and the ignition loss of 1.5% to 20%; the slag powder is commercially-available slag powder which is in line with national standards GB / T18046-2008; the steel slag is steel slag of a converter or electric furnace; and the white slag is slag, which is formed through carrying out diffusive deoxidation by taking carbon powder and ferro-silicon powder as reducers during the reduction-period operation of arc-furnace steelmaking. The high-strength double-doped mineral powder disclosed by the invention is mainly prepared from the steel slag and the blast-furnace slag powder, and the steel slag and the blast-furnace slag powder complement each other in properties through combination, so that the later strength of concrete can be effectively improved, the heat of hydration is reduced, and the slump loss is reduced; and the improvement on the working performance of the concrete is much higher than that resulting from purely using blast-furnace slag or the steel slag.

Description

technical field [0001] The invention relates to the technical field of metallurgy and environmental protection, in particular to a high-strength double-doped mineral powder. Background technique [0002] Steel slag is a kind of industrial waste slag produced during steelmaking in iron and steel enterprises. Its quantity is generally 10-20% of crude steel output, and the amount produced is huge. In 2006, the national production of steel slag was about 70 million tons, and it is still increasing every year. According to incomplete statistics, the comprehensive utilization rate of steel slag is only 10%, and most of the steel slag is still discarded. Steel slag is the most important industrial waste in iron and steel enterprises. Generally, it also contains about 10% scrap steel and more than 15% iron oxide components, and is rich in Ca and Mg-rich alkaline oxide compound mineral clinker, and most of them are slag-coated iron and iron-coated slag solids. In the state of compou...

AI Technical Summary

Problems solved by technology

[0004] The present invention intends to provide high-strength double-doped slag powder to solve the problem that steel slag is difficult to utilize and accumulate too much to affect the environment

Images