The present invention provides a method for the preparation of multi-nutrient potassic fertilizer, by recovering potassium from sugarcane molasses based alcohol distillery effluent (commonly known as spent wash). The process involves pre-treatment of spent wash to clarify the aqueous phase and utilization of the treated spent wash in production of potassic fertilizer. The present invention enables utilisation of spent wash for recovery of value-added product (viz., potash fertiliser of >99% purity) and improves ease of Zero Liquid Discharge compliance by subjecting the relatively benign process effluent to industrially practiced techniques for water recovery and salt reclamation.

Described are embodiments of a lithium metal phosphate production methods and systems. The systems and methods can include combining lithium extraction from spodumene, lithium recycling from lithium ion battery (LIB) black mass, and/or lithium metal phosphate synthesis from metal phosphates.

Described are embodiments of a lithium metal phosphate production methods and systems. The systems and methods can include combining lithium extraction from spodumene, lithium recycling from lithium ion battery (LIB) black mass, and/or lithium metal phosphate synthesis from metal phosphates.

Provided is a method of manufacturing a high-purity lithium phosphate by utilizing a lithium waste liquid of a wasted battery. Lithium phosphate is manufactured and refined by using a minimized amount of sodium hydroxide and by using phosphate, lithium hydroxide, and an optimized pH condition, so that it is possible to manufacture high-purity lithium phosphate from which fine impurities which cannot be removed by cleaning are effective removed. A waste water treatment process of processing waste water as to be immediately discharged is integrated, so that the method is very efficient and environment-friendly. Therefore, since the high-purity lithium phosphate can be manufactured by utilizing a lithium waste liquid discarded in a wasted battery recycling process, the method has an effect in that the method is applied to a wasted battery recycling industry to prevent environmental pollution and facilitate recycling resources.

An embodiment of the present invention provides a method for preparing a solid lithium salt from a lithium solution including the steps of, preparing a mixture in which a phosphorus-containing material is added to a lithium solution in step 1; adding a basic solution to the prepared mixture to adjust the pH in step 2; making the pH-adjusted mixture react by raising its temperature and filtering to recover lithium phosphate in step 3; preparing an acid lithium solution in which distilled water and acid are added to the recovered lithium phosphate, in step 4; and recovering a solid lithium salt by evaporative concentration of the acid lithium solution, in step 5.

The present application relates to field of cathode material, and a cathode material and a method for preparing the same, a lithium ion battery provided, where the cathode material includes an active material having a chemical formula Li.sub.a(Ni.sub.xCo.sub.yR.sub.z).sub.1-bM.sub.bO.sub.2, where 0.9a1.10, x+y+z=1, 0.8x0.99, 0y0.15, 0z0.1, 0b0.1; R includes Al and/or Mn, M includes a metal element; and a coating layer on surface of the active material, where the coating layer includes a phosphate compound; the cathode material has a particle hardness of Cs50 Mpa and satisfies the following: Cs.sub.10/Cs.sub.500.7; where Cs.sub.10 is hardness of particles with a particle size D10, and Cs.sub.50 is hardness of particles with a particle size D50. The cathode material and method for preparing the same, lithium ion battery provided, which improve coating uniformity, precisely control coating amount, improve rate and cycling performance of lithium ion battery, and reduce production costs.

Provided is a method of manufacturing a high-purity lithium phosphate by utilizing a lithium waste liquid of a wasted battery. Lithium phosphate is manufactured and refined by using a minimized amount of sodium hydroxide and by using phosphate, lithium hydroxide, and an optimized pH condition, so that it is possible to manufacture high-purity lithium phosphate from which fine impurities which cannot be removed by cleaning are effective removed. A waste water treatment process of processing waste water as to be immediately discharged is integrated, so that the method is very efficient and environment-friendly. Therefore, since the high-purity lithium phosphate can be manufactured by utilizing a lithium waste liquid discarded in a wasted battery recycling process, the method has an effect in that the method is applied to a wasted battery recycling industry to prevent environmental pollution and facilitate recycling resources.

The present invention relates to a method for recovering lithium from a waste lithium secondary battery using a pyrometallurgical smelting method, which comprises a step for melting a waste lithium secondary battery containing nickel, cobalt, copper, and lithium, a flux having a melting temperature of 1,400 C. or less, and a lithium recovery agent to separate and obtain a slag, metal phase and lithium compound, wherein the lithium recovery agent includes at least one of chlorine and fluorine, and wherein the amount of each of nickel, cobalt and copper contained in the metal phase is more than 10 times compared to that of the slag.