Preparation Of Inorganic Lithium Ion Adsorption Material And Research Of Its Properties

Lithium resources is one of the important strategic resourceslithium and.itscompounds exist mainly in seawater, brineand ore deposit. Extracting lithium from solution has becomethe role way of developing lithium and most researchers are focusing on that.which is facing with a higher proterties d spinel lithium ionic sieve.In this work, spinel lithium ionic sieve was prepared and the performance of lithium extracted from brine was investigated. A particle making method for the commercial inorganic ions adsorption materials was studied also. First, spinel-type precursor LiMn2O4ion sieve were synthesized with LiOH H2O and MnCO3via controlling reactioncondition of inorganic manganese adsorption material, thefinal Spinel-type ionsieve with higher Li+selective adsorption propertywas prepared and further modified by acid treatment to extract lithium ions completely. Results showed that the precursors were closed to spinel-type crystals and had high specific surface area when the amount of lithium-manganesemolar ratio in the ion-sieve material preparation system of Li to Mn was0.5and reaction was at800℃for15hour. The adsorption experiments showed that ion-sieve could adsorb Li+in alkaline solution and the exchange capacity of the ion-sieve was enhanced with the increasing of pH and temperature in the process of adsorption,its maximum capacity reached.32.251mg/g when pH was12.95in LiOH solution and the time of adsorption equilibrium was30h. After being reused8times, the adsorption amount maintained at18mg/g or more and the lithium adsorption amount in Tibet Longmucuo brine reached11.273mg/g. The adsorption process was found to fit pseudo—second—order kineticequation,so the adsorption process was determined to be chemical adsorption and thekinetics controlled step of adsorbent withLi+was determined to be particle diffusion control (PDC).Second, a new particle making method was studied for commercial spherical inorganic ion adsorbent by PVC-NMP-KNO3-H2O system. Results showed that the spherical had a large number of pores and internal shape of the skeleton was mesh. The static ion-exchange capacity for lithium ions of spherical adsorbent was8.249mg/g. Static adsorption kinetics of spherical adsorbent sample was well accorded with Lagergren equation with the first order adsorption rate constant of5.21×10-3/s, and the capacity reached to4.867mg/g during the dynamic adsorption process.