The invention discloses a
potassium removal process of a production
system for
lithium extraction from ore, belonging to the field of wet
metallurgy. The invention particularly relates to the field of
lithium salt production, and aims to solve the problems of long
potassium removal process flow and high
potassium removal operation difficulty in conventional removal of potassium in
lepidolite. The potassium removal process comprises the following steps: conducting
neutralization and
nitrate removal through
evaporation to generate potassium-rich
sodium precipitation mother liquor; adding
ferric salt into the potassium-rich
sodium precipitation mother liquor with an adjusted pH value to obtain potassium-containing
mother liquor; heating the potassium-containing mother liquor to 95 DEG C, and conducting stirring, reacting and crystallizing for 1-3 hours to obtain a suspension; and
settling the suspension, carrying out
solid-liquid separation, adjusting the pH value of a supernatant to 5-7 by using
calcium carbonate, and removing iron. The process is short in process flow, convenient to control, simple in subsequent
impurity removal, compatible with a sulfuric-acid-method
lithium extraction process, simple in design and easy to implement.