A kind of silicon-rich magnesium nickel slag-free clinker non-shrinkage cement and its preparation method

Abstract

The invention discloses silicon-rich and magnesium-rich nickel slag clinker-free non-shrinking cement. The silicon-rich and magnesium-rich nickel slag clinker-free non-shrinking cement is prepared from the following components: lime, lithium slag and silicon-rich and magnesium-rich nickel slag, wherein the mass percent of the lime, the lithium slag and the silicon-rich and magnesium-rich nickel slag is 10 percent to 20 percent, 20 percent to 40 percent and 40 percent to 70 percent respectively. According to the silicon-rich and magnesium-rich nickel slag clinker-free non-shrinking cement, thelime and the lithium slag are used as an alkali activator; under a certain temperature condition, a cementing property potential of main minerals in the silicon-rich and magnesium-rich nickel slag isrealized extremely, the hydration activity is improved and a cementing material is obtained. By controlling the doping amounts of the lime and the lithium slag and reaction temperature and respectivereaction speeds of mineral components including clino-enstatite, enstatite and ferrohortonolite, so that a generation speed of Mg(OH)2 in a hydration reaction product is controlled; a principle that the volume of the Mg(OH)2 is increased by utilizing MgO in the minerals is utilized and the shrinkage performance of a cement component is controlled, so that a non-shrinking cement component is prepared; a way for greatly and sufficiently utilizing the nickel slag is provided. Moreover, a preparation technology of the clinker-free cement is simple and is easy to operate.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a silicon-rich magnesium nickel slag-free clinker-free cement and a preparation method thereof. Background technique [0002] The hardening shrinkage of Portland cement is its serious shortcoming. It will cause the cement to be unsuitable for making super-long components, and the cement components will produce micro-cracks, etc., which seriously limits the scope of use of cement. [0003] Nickel slag is a kind of industrial waste slag discharged during the nickel metal smelting process. Calculated by producing 1 ton of nickel to produce 20-30 tons of nickel slag, the nickel slag produced nationwide in 2015 was about 2,500-4,000 tons, which urgently needs to be effectively utilized. The chemical composition of silicon-rich magnesium nickel slag is CaO, SiO 2 , MgO, Al2O 3 , Fe 2 o 3 , in various nickel slags its SiO 2 , MgO content is high, and the sum of the two...

AI Technical Summary

Problems solved by technology

The hydration activity of nickel slag itself is very low, and it is difficult to be directly used as a cementitious material in large quantities.

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