▎ 摘　　要

NOVELTY - Carbon-coated lithium iron manganese phosphate is prepared by (a) soaking waste solid lithium iron phosphate separated in acidic waste water in the process of producing titanium pigment by chlorination method, and separating solid and liquid to obtain filtrate; (b) performing Inductively Coupled Plasma (ICP) test on filter liquid to get the content of elements of lithium, iron, manganese, phosphorus, and phosphorus in the filtrates; (c) adding iron (Fe) source and/or manganese (Mn) source according to the mole number x+y=1 of Fe and Mn elements in the filtrate, where x is 0.6-0.9, and y is 0.1-0.4; (d) adding lithium source; (e) adding phosphorus source and adjusting the pH value of filtrate to 8-11 and reacting to obtain the lithium-manganese phosphate precursor; and (f) mixing lithium manganese phosphate precursor, carbon source, water and dispersant uniformly to obtain the lithium manganese phosphate slurry, grinding, drying, and roasting. USE - Preparation of carbon-coated lithium iron manganese phosphate used for lithium ion battery (claimed) used in electrochemical energy storage. ADVANTAGE - The method solves the problem of recycling the waste solid lithium iron phosphate separated from acidic waste water and lithium ion battery in the process of producing titanium pigment by chlorination process, and greatly reduces the production cost of carbon-coated lithium manganese phosphate. The method has high recovery and utilization rate of waste material, simple steps, and convenient operation; does not easily generate secondary pollution; and is more environment-friendly.