78 results about "First-order reaction" patented technology

The invention provides a preparation method of battery grade lithium carbonate. The preparation method is characterized by preparing slurry from industrial lithium carbonate, pumping the slurry into a first-order reaction kettle, introducing collected CO2, carrying out full reaction, then carrying out filtration to obtain filter residues, preparing slurry from the filter residues, pumping the slurry into a second-order reaction kettle, introducing collected CO2, carrying out full reaction, then carrying out filtration to obtain filter residues, preparing slurry from the filter residues, pumping the slurry into a third-order reaction kettle, introducing high-purity CO2, carrying out full reaction and then carrying out filtration; firstly pumping the filtrate obtained after each-order filtration into a decomposition reaction kettle, then transferring the filtrate to a causticization reaction kettle, adding a Ca(OH)2 solution, carrying out immediate filtration and washing to obtain filtrates, pumping the filtrates into a concentration kettle, pumping the concentrate into a synthesis kettle after the concentrate passes through a column filled with ion exchange resin and introducing high-purity CO2, thus preparing high-purity battery grade lithium carbonate. The preparation method has the beneficial effects that by utilizing the advantage that lithium carbonate can undergo hydrogenation and efficiently utilize high-purity CO2, CO2 is recycled in the reaction process and foreign ions in the kettles can be ensured to be removed, thus reducing the production cost.

The invention discloses a purification method of lime-flue gas brine, which comprises the following steps: 1) performing first-order reaction clarification: measuring concentration of Ca<2+> and Mg<2+> in raw brine, calculating required amount of lime and sodium carbonate, performing pre-feeding with the lime, feeding sodium carbonate to the raw brine and finally feeding the residual lime; 2) performing sampling and rework: testing concentration values of Ca<2+> and Mg<2+> in mixed brine liquid after a reaction, performing Step 3) if qualified, and performing further purification by utilizing caustic soda and sodium carbonate if unqualified; 3) performing primary flocculation: adding an HEC (Hydroxy Ethyl Cellulose)-maleic acid-chitosan composite flocculant to the mixed brine liquid for flocculating settling; 4) performing second-order reaction clarification: supplying carbon dioxide flue gas to liquid after the primary settling; 5) performing secondary flocculation: adding the HEC-maleic acid-chitosan composite flocculant to the brine liquid for the flocculating settling; 6) transferring liquid after the settling to a refined brine barrel of a salt manufacturing workshop. Compared with the traditional two-alkali method, the purification method has a great economic benefit; the composite flocculant is adopted, so that the purification time is short and the turbidity of the purified brine is low; the flocculant is more stable.