Method for preparation of chemical raw materials by using of potassium-containing shale

Abstract

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.

Description

technical field [0001] The invention relates to the field of preparation of chemical raw materials, in particular to a method for preparing chemical raw materials from potassium-containing shale. Background technique [0002] Shale is a clay-based sedimentary rock with thin sheet-like bedding structure after diagenesis and consolidation. When the shale is mixed with a certain amount of potassium feldspar debris, it is called potassium-bearing shale. Potassium shale, also known as sandstone, has the molecular formula K 4 Al 9 [Si 15 o 40 ] (OH) 11 , which in its mineral theory contains: K 2 O8.5%, Fe 2 o 3 6.6%, Al 2 o 3 17.6%, Ca 2 O2.8%, Mg 2 O3.5%, SiO 2 53.5%, Na 2 O0.1%, loss on ignition 1.33%. Potassium-bearing shale is insoluble in water at room temperature, and also insoluble in acetic acid, nitric acid, sulfuric acid, alkali and inorganic salts. [0003] In the prior art, the comprehensive utilization of potassium-bearing shale (sandstone) to produce c...

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Problems solved by technology

[0006] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a method for preparing chemical raw materials using potassium-containing shale, which can solve the problem of impurities brought in when potassium-containing shale is used as a raw material to produce chemical raw materials, and can Produce useless calcium elements into calcium chloride products, and at the same time produce polyaluminum sulfate and polyferric sulfate chemical raw materials

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