Study On New Lithium Adsorbent Adsorption Performance And The Technology Of Extracting Lithium

With the rapid development of electric bicycles, electric cars and IT industry inrecent years, lithium battery and lithium power battery has become the indispensableenergy. The demand for lithium resource in global increases year by year. Over thepast more than a century of mining, the solid-state lithium resources at home andabroad has dried up future in advance into the state. It would’t satisfy people’s needs.Salt lake brine, sea water contains limitless liquid lithium resources, is a majorresource system of lithium industry in the future. How to extracting lithium from theseliquid mines becomes an important subject in the new century. At present, thedomestic and foreign scholars have made a lot of research on liquid lithium resources,the adsorption of extracting lithium is regarded as the most promising way forextracting lithium. But most of powder lithium adsorbent exists only in lab forextracting lithium, the problem of filtering determines powder lithium adsorbentcannot be applied in industrial production.The research is about the performance of new lithium adsorbent, lithiumadsorbent ’s selectivity in the simulation of brine after forming. the new adsorbent indynamic countercurrent recycling technology of extracting lithium adsorption,desorption was mainly studied. Parameters in the process of extracting lithium wasdetermined, and it can be the basis for extracting lithium process of actualization.Here are the results of the paper’s research:(1) Alkali is driven to adsorption. According to the comparison of saturated adsorptionbetween adsorbent in the Li+solution with and without alkali, in no alkali solution,the concentration of Li+has no change before and after reaction. It is more completeto proof that alkali as one of the dynamic adsorption reaction, promotes the process ofadsorption.(2) after the adsorbent powder is preparated, The research about which kinds of acidcould be used to pickling and the time required is done in the vessels; saturatedadsorption of adsorbent is done and the capacity is31.66mg/g; By the related curve about time, capacity and the change of pH during the process, it can determined thatthe adsorption in the first60min is the fastest, and adsorption capacity is close tosaturation.(3) The new adsorbent of lithium before and after molding has agood adsorptionchoice in simulated brine,the adsorption rate of powder adsorbent for lithium is ashigh as80.0%, adsorption rate of granular adsorbent for lithium reached65%.(4) according to the research on the dynamics of ion exchange,we can know thatchemical reaction process controls the process of ion exchange rate; According tofitting pseudo first-order kinetics and pseudo secondary dynamics equation shows thatthe adsorption process conforms to the pseudo secondary adsorption kinetics(5) With the experiment of granular adsorbent in adsorption column on dynamicsaturated adsorption, dynamic adsorption in simulation brine is carried out, we canobtaine that the rate of the dynamic resolution is more than90%as granular adsorbentin a single column, the best ratio of high to diameter of adsorption column is32, andretention time is about30min, the flow speed about10mL/min is the best.(6) The optimum selection of adsorption desorption series, it is concluded that the bestprocess conditions is the fourth adsorption, third desorption, the rate of adsorption is55.66%, the rate of desorption is99.01%.