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1. A method for producing an aqueous suspension, comprising: (a) providing an aqueous solution A comprising at least 5 weight % of a water-soluble calcium salt, (b) providing an aqueous solution B comprising at least 5 weight % of an alkali metal hydroxide, (c) metering solution A and solution B simultaneously into a continuous reactor and contacting solution A and solution B such that solution A and solution B are mixed rapidly and intensely to form a suspension, wherein the rapid and intense mixing of the solution A and the solution B takes place continuously and a mixing time is below 1 minute, wherein the solution A and solution B are metered under pressure of at least 5 bar into the continuous reactor by means of pumps, wherein the pressure and a resulting velocity of the solution A and the solution B on introduction into the continuous reactor produces the rapid and intense mixing, and (d) discharging the suspension from the continuous reactor, where a compound for stabilizing the suspension is added to the solution A, to the solution B or to both solutions, or to the suspension produced, wherein the suspension includes calcium hydroxide in the form of nanoparticles having a particle size D90 of below 800 nm, measured by dynamic light scattering with photon cross-correlation spectroscopy, and wherein the suspension is free from calcium silicate hydrate.
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