Optimization of controlled crystallization and purification for magnesium hydroxide precipitation from brine via lime process: A green and sustainable approach for seawater resource recovery

Box‑Behnken design (BBD) response surface methodology data. This part comprises 15 experimental runs (including three center‑point replicates) with three factors: stirring speed (100, 120, 140 rpm), Mg concentration (0.8, 1.0, 1.2 mol/L), and Ca/Mg molar ratio (1.0, 1.1, 1.2). D10, D50, and D90 were measured for each run.3. Washing purification orthogonal design data (L4, 23). This part comprises four experimental runs covering three factors: washing temperature (30, 60 °C), water-to-filter-cake mass ratio (2:1, 4:1), and washing time (30, 60 min).

The dataset includes Na+ and K+ removal efficiencies, residual Na2O and K2O contents, and total alkali metal oxide content (Na2O + K2O) after washing.All particle size measurements were performed using a Microtrac S3500 laser diffraction particle size analyzer. Chemical compositions (Mg2+, Na+, K+, Ca2+, Cl-) were analyzed by complexometric titration and flame atomic absorption spectrometry. The quadratic model for D₅₀ was fitted using Python (NumPy and SciPy).