TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The salt is zinc chloride sesquihydrate, zinc chloride dihemihydrate or zinc chloride tetrahydrate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The step (b) and (c) are conducted simultaneously or separately. The pretreatment is a thermal, chemical, mechanical and/or enzymatic treatment. The step (a) is carried out under acidic conditions or no chemical reagents, where the pretreated filler is subjected before step (b) to a separation step to recover a solid fraction and a liquid fraction, at least a portion of the solid fraction is fed to the enzymatic hydrolysis of step (b) and at least a portion of the liquid fraction is recycled to the enzymatic hydrolysis step (j). The pretreatment is carried out by steam explosion, with or without addition of acid. At least a portion of the liquid fraction obtained in step (e) is recycled to the enzymatic hydrolysis of step (j). The washing solution obtained in the step (f) is at least partially recycled to the enzymatic hydrolysis of step (j). The step (i) comprises processing the solid fraction obtained in step (h) by one or more washing, neutralization, pressing and/or drying. At least a portion of the obtained liquid fraction of step (h) is sent to (k) a purification step, for concentrating the inorganic salt contained in the liquid and to obtain a liquid fraction containing concentrated inorganic salt and another liquid fraction depleted inorganic salt, where the liquid fraction containing concentrated inorganic salt is then at least partly recycled to the baking step (g). The step (i) of treatment of solid fraction obtained in step (h) is carried out by one or more washing to obtain a solid fraction and a liquid fraction, where the liquid fraction is at least partially sent to a purification step, and aggregating the inorganic salt contained in the liquid fraction and to obtain a liquid fraction containing concentrated inorganic salt and another liquid fraction depleted inorganic salt, where the liquid fraction containing concentrated inorganic salt is then at least partially recycled to the baking step (g). The step (g) is performed in the presence of one or more organic solvents comprising alcohols containing methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol or tert-butanol, diols and polyols including ethanediol, propanediol or glycerol, amino alcohols including ethanolamine, diethanolamine or triethanolamine, ketones including acetone or methyl ethyl ketone, carboxylic acids including formic acid or acetic acid, dimethylformamide, dimethylacetamide, dimethylsulfoxide, acetonitrile or aromatic solvents including benzene, toluene, xylenes or alkanes. The step (h) is carried out by precipitation by adding at least one anti-solvent which is a solvent or a mixture of the solvents comprising water, alcohols, diols and polyols, amino alcohols, ketones, carboxylic acids, esters including ethyl acetate or isopropyl acetate, dimethylformamide, dimethylacetamide, dimethylsulfoxide or acetonitrile. Preferred Definitions:    X = halide anion including Cl-, F-, Br-, I-, perchlorate anion, thiocyanate anion, nitrate anion, acetate anion, para-methylbenzene sulfonate anion, sulfate anion, oxalate anion or phosphate anion; and    M = Li, Fe, Zn or Al.    EXAMPLE - No suitable example given.