The invention discloses a method for preparing high-purity
iron phosphate from iron-containing
slag, and belongs to the technical field of comprehensive utilization of industrial
solid wastes. The method comprises the steps that: high-concentration
phosphoric acid selective leaching is conducted on the iron-containing
slag, the concentration of
phosphoric acid is 4-8 mol / L,
solid-liquid separation is conducted after the reaction is finished, and leached
slag can serve as a
raw material for manufacturing
cement ceramics to be sold; water is added into
leachate to dilute the
leachate, and then
crystallization iscontrolled to prepare high-purity
iron phosphate; and residual
crystallization liquid is subjected to a membrane separation-
evaporation concentration process to realize regeneration and cyclic utilization of the
phosphoric acid. The method is short in process, low in cost, high in environmental friendliness and high in iron
utilization rate; the prepared high-purity
iron phosphate can be used for preparing materials such as
lithium ion batteries, ceramics and catalysts; and
macro element iron in iron-containing industrial
solid waste is utilized in a high-valued mode. According to the method, the problems of environmental
pollution and resource waste caused by the iron-containing slag are solved, the
environmental protection pressure of metallurgical enterprises is relieved, and the
economic benefits of the metallurgical enterprises are improved.