Composite inhibitor, flotation reagent and method for reverse flotation dephosphorization of phosphorus-containing lithium ore

The invention belongs to the field of mineral flotation, and particularly discloses a composite inhibitor for reverse flotation dephosphorization of phosphorus-containing lithium ore, which comprises at least one of alginic acid and salts thereof, and malic acid and salts thereof. The invention also provides a dephosphorization method for phosphorus-containing lithium ore by adopting the inhibitor. The composite inhibitor has good inhibition capability and selectivity, spodumene can be selectively inhibited in a phosphorus-containing lithium ore flotation system, and apatite is hardly influenced, so that the apatite is more efficiently removed through reverse flotation. Furthermore, the spodumene composite inhibitor also has a good reverse flotation dephosphorization effect on different types of phosphorus-containing lithium ores, can realize selective separation of spodumene and apatite, and obviously reduces the loss rate of lithium in apatite tailings, so that the content of P2O5 in spodumene concentrate r