The invention discloses a method for preparation of chemical raw materials by using of
potassium-containing shale, and the method comprises the following steps: first, mixing
potassium-containing shale
powder and
hydrochloric acid in a reaction kettle for pretreatment, filtrating to get a
hydrochloride solution and a shale acidification body, then performing
catalytic decomposition of the shale acidification body to obtain an aluminum salt, an iron salt and a
potassium salt; reacting the
hydrochloride solution with
calcium hydroxide for an acid-base reaction, adjusting the pH value to 7 - 9, performing secondary filtering of the reactants to obtain a filtrate cake and a filtrate,
drying the filtrate to obtain
calcium chloride hexahydrate and
calcium chloride dihydrate; mixing the
filter cake with
sulfuric acid for
dissolution, slowly adding a
sodium carbonate solution, adjusting the pH value, and then adding a polymerizer to the solution for reaction to prepare polymeric aluminum
sulfate and polymeric
ferric sulphate. The method can solve the problem of impurities taken in by the potassium-containing shale as a
raw material for the production of the chemical raw materials, and can prepare useless calcium element into a calcium
chloride product, and meanwhile can produce the chemical raw materials of the polymeric aluminum
sulfate and the polymeric
ferric sulphate, lower the production costs and improve the economic efficiency.