Preparation method of weakly-alkaline-activated nickel slag high-strength concrete

Abstract

The invention relates to a preparation method of weak-base excited nickel slag high-strength concrete. The weak-base excited nickel slag high-strength concrete is prepared from the following raw materials in parts by mass: 350-450 parts of nickel slag, 40-50 parts of carbide slag, 20-30 parts of sodium carbonate, 40-50 parts of phosphogypsum, 550-650 parts of ferronickel tailings, 1100-1300 parts of stones, 200-300 parts of water, 5-10 parts of a grinding aid and 5-10 parts of an additive. Nickel slag is subjected to wet grinding treatment, nickel slag particles larger in specific surface area and more concentrated in particle size distribution are obtained to replace a cementing material, a weakly alkaline compound (sodium carbonate) and industrial by-products (carbide slag and ardealite) serve as excitants, and ferronickel tailings serve as fine aggregate. The nickel slag is treated in a wet grinding ultra-refining mode, energy consumption is low, and the grinding efficiency is high. Meanwhile, the sodium carbonate is added, so that metal nickel ions can be effectively cured. The prepared concrete is high in strength and good in volume stability, can effectively solve the problem of carbonization of concrete, and can be widely applied to industrial and civil buildings.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a preparation method of nickel slag high-strength concrete excited by weak alkali. Background technique [0002] Nickel slag is the solid waste generated during the process of smelting nickel-iron alloy or extracting metallic nickel. Its chemical composition is mainly SiO 2 , CaO, Al 2 o 3 , Fe 2 o 3 , MgO, etc., where SiO 2 , CaO, Al 2 o 3 The content is relatively high and has a certain pozzolanic activity. Nickel slag was previously used to extract valuable metals Ne, Fe, Co, etc. Now the domestic and foreign nickel smelting technology is very mature, so the nickel content in the nickel slag discharged from the smelting of metal nickel is already very low, so the utilization of nickel slag rate dropped significantly. At present, many smelting enterprises only deal with nickel slag by open-air accumulation or simple landfill, which not only takes up a lot...

AI Technical Summary

Problems solved by technology

However, strong alkali compounds are used, the volume stability of concrete is difficult to control and there is a potential risk of alkali-aggregate reaction

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