• Title/Summary/Keyword: Lithium hydroxide

Search Result 46, Processing Time 0.017 seconds

A study on the reaction of carbonation in the preparation of lithium carbonate powders (탄산리튬 분말 제조에 있어서 탄산화 반응에 관한 연구)

  • Yang, Jae-Kyo;Jin, Yun-Ho;Yang, Dae-Hoon;Kim, Dae-Weon
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.29 no.5
    • /
    • pp.222-228
    • /
    • 2019
  • In this study, we carried out the experiment to prepare lithium carbonate powder through gas-liquid reactions with a lithium-containing solution and $CO_2$ gas using lithium hydroxide, lithium chloride, and lithium sulfate. Thermodynamically, the carbonation reaction of a lithium-containing solution showed that aqueous reaction of lithium hydroxide occurs spontaneously, but aqueous reactions of lithium chloride and lithium sulfate does not occur spontaneously. In the case of lithium hydroxide solution, the recovery rate of lithium carbonate was 69.8 % at room temperature ($25^{\circ}C$), and increased to 89.4 % at $60^{\circ}C$. In the case of lithium chloride and lithium sulfate solution, lithium carbonate could be prepared using sodium hydroxide as an additive, but the recovery rates were 19.2 % and 16.7 %, respectively.

A study on the pyrolysis of lithium carbonate for conversion of lithium hydroxide from lithium carbonate (탄산리튬으로부터 수산화리튬 전환을 위하여 탄산리튬의 열분해에 대한 연구)

  • Park, Jae Eun;Park, Min Hwa;Seo, Hyeong Jun;Kim, Tae Seong;Kim, Dae Weon;Kim, Bo Ram;Choi, Hee Lack
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.31 no.2
    • /
    • pp.89-95
    • /
    • 2021
  • Research on the production of lithium hydroxide (LiOH) has been actively conducted in response to the increasing demand for high nickel-based positive electrode materials for lithium-ion batteries. Herein we studied the conversion of lithium oxide (Li2O) through thermal decomposition of lithium carbonate for the production of lithium hydroxide from lithium carbonate (Li2CO3). The reaction mechanism of lithium carbonate with alumina, quartz and graphite crucible during heat treatment was confirmed. When graphite crucible was used, complete lithium oxide powder was obtained. Based on the TG analysis results, reagent-grade lithium carbonate was heat-treated at 700℃, 900℃ and 1100℃ for various time and atmosphere conditions. XRD analysis showed the produced lithium oxide showed high crystallinity at 1100℃ for 1 hour in a nitrogen atmosphere. In addition, several reagent-grade lithium oxides were reacted at 100℃ to convert to lithium hydroxide. XRD analysis confirmed that lithium hydroxide (LiOH) and lithium hydroxide monohydrate (LiOH·H2O) were produced.

A Study on the Synthesis Behavior of Lithium Hydroxide by Type of Precipitant for Lithium Sulfate Recovered from Waste LIB (폐리튬이차전지에서 회수된 황산리튬 전구체로부터 침전제 종류별 수산화리튬 제조 거동 연구)

  • Joo, Soyeong;Kim, Dae-Guen;Byun, Suk-Hyun;Kim, Yong Hwan;Shim, Hyun-Woo
    • Resources Recycling
    • /
    • v.30 no.1
    • /
    • pp.44-52
    • /
    • 2021
  • This study investigated the effect of the type of alkaline precipitant used on the synthesis of lithium hydroxide by examining the behavior of lithium hydroxide produced using lithium sulfate recovered from a waste lithium secondary battery as a raw material. The double-replacement reaction (DRR) process was used to remove the impurities contained in the lithium salt precursor of lithium sulfate and to improve the efficiency of the synthesis of lithium hydroxide. The experiment was conducted by control the molar ratio of the precursor ([Li]/[OH]), the reaction temperature, and the composition of the alkaline precipitant (KOH, Ca(OH)2, Ba(OH)2) used for the production of highly-crystalline lithium hydroxide. A secondary solid-liquid separation was performed following the reaction to remove the impurities generated, and the purified aqueous solution of lithium hydroxide was evaporated to remove the moisture and obtain the product as a powder. The crystallinity and synthesis behavior of the product were examined.

Fabrication of Porcelains Having Improved Thermal Shock Resistance by a Lithium Solution Infiltration Method (리튬용액침투법에 의한 내열충격성이 향상된 세라믹 제조)

  • Na, Sang-Moon;Lee, Sang-Jin
    • Journal of the Korean Ceramic Society
    • /
    • v.50 no.2
    • /
    • pp.127-133
    • /
    • 2013
  • Porcelain with high thermal shock resistance was successfully fabricated by a lithium solution infiltration method with a lithium hydroxide solution. Lithium hydroxide solutions having various lithium concentrations were infiltrated into pre-sintered porcelain bodies. The porcelain sample infiltrated by the 9 wt% lithium solution and heat treated at $1250^{\circ}C$ for 1 h showed a low thermal expansion coefficient of $1.0{\times}10^{-6}/^{\circ}C$ with excellent thermal shock resistance. The highly thermally resistant porcelain had a well-developed ${\beta}$-spodumene phase with the general phases observed in porcelain. Furthermore, the porcelain showed a denser structure of $2.41g/cm^3$ sintering density and excellent whiteness in comparison with commercial thermally resistible porcelains. The lithium hydroxide in the samples readily reacted with moisture, and liquid phase reactants were formed during the fabrication process. In the case of an excess amount of lithium in the sample body, the lithium reactants were forced to the surface and re-crystallized at the surface, leaving large pores beneath the surface. These phenomena resulted in an irregular structure in the surface area and led to cracking in samples subjected to a thermal shock test.

Recovery of Valuable Lithium Hydroxide by Ion Exchange Process: A Review (이온 교환 공정에 의한 귀중한 수산화 리튬의 회수: 리뷰)

  • Sarsenbek, Assel;Rajkumar, Patel
    • Membrane Journal
    • /
    • v.32 no.6
    • /
    • pp.401-410
    • /
    • 2022
  • Demand for lithium hydroxide (LiOH) is annually increasing due to its efficiency and safety for the environment in comparison to its current alternatives. Lithium can be found in different salty and brine lakes which later synthesized to produce LiOH for various applications. Different methods are used to separate and recover lithium ions, the most common of which is electrodialysis (ED). ED is a membrane-based separation technique which works on potential difference of its layers as a driving force to push ions from one side to another. The ion exchange membrane (IEM) in ED makes the process efficient because of the perm selectivity of different ions vary depending on their hydrodynamic volume. In this review, the different alteration strategies of both ED and IEM, to enhance the recovery of lithium ions are discussed.

A study on the fabrication of lithium carbonation powder by gas-liquid reaction using ultrasonic energy (탄산리튬 분말 제조에 있어서 초음파 에너지를 적용한 기액반응에 관한 연구)

  • Kim, Dae-Weon;Kim, Bo-Ram;Choi, Hee-Lack
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.30 no.2
    • /
    • pp.55-60
    • /
    • 2020
  • In the previous study, we reported the result to prepare lithium carbonate powder from various lithium-contained solution. Therefore, using the lithium hydroxide solution, it is conformed that the reaction could occur thermodynamically, and the recovery rate of lithium was 89.4 %. In this study, we carried out the experiment to prepare lithium carbonate powder through gas-liquid reactions with lithium hydroxide solution and CO2 gas using ultrasound energy. In case ultrasonic energy is applied to the reaction of lithium carbonate, the recovery rate of lithium at room temperature was approximately 83.8 %, and the recovery rate of lithium was greatly increased to approximately 99.9 % at 60℃ reaction temperature. And when ultrasonic energy is not applied, the particle size of lithium carbonate powder was 7.7 ㎛ in D50. But the particle size of lithium carbonate powder was significantly reduced to 8.4 ㎛ in D50 under the influence of ultrasonic.

Study on Preparation of High Purity Lithium Hydroxide Powder with 2-step Precipitation Process Using Lithium Carbonate Recovered from Waste LIB Battery (폐리튬이차전지에서 회수한 탄산리튬으로부터 2-step 침전공정을 이용한 고순도 수산화리튬 분말 제조 연구)

  • Joo, Soyeong;Kang, Yubin;Shim, Hyun-Woo;Byun, Suk-Hyun;Kim, Yong Hwan;Lee, Chan-Gi;Kim, Dae-Guen
    • Resources Recycling
    • /
    • v.28 no.5
    • /
    • pp.60-67
    • /
    • 2019
  • A valuable metal recovery from waste resources such as spent rechargeable secondary batteries is of critical issues because of a sharp increase in the amount of waste resources. In this context, it is necessary to research not only recycling waste lithium-ion batteries (LIBs), but also reusing valuable metals (e.g., Li, Co, Ni, Mn etc.) recovered from waste LIBs. In particular, the lithium hydroxide ($LiOH{\cdot}xH_2O$), which is of precursors that can be prepared by the recovery of Li in waste LIBs, can be reused as a catalyst, a carbon dioxide absorbent, and again as a precursor for cathode materials of LIB. However, most studies of recycling the waste LIBs have been focused on the preparation of lithium carbonate with a recovery of Li. Herein, we show the preparation of high purity lithium hydroxide powder along with the precipitation process, and the systematic study to find an optimum condition is also carried out. The lithium carbonate, which is recovered from waste LIBs, was used as starting materials for synthesis of lithium hydroxide. The optimum precipitation conditions for the preparation of LiOH were found as follows: based on stirring, reaction temperature $90^{\circ}C$, reaction time 3 hr, precursor ratio 1:1. To synthesize uniform and high purity lithium hydroxide, 2-step precipitation process was additionally performed, and consequently, high purity $LiOH{\cdot}xH_2O$ powder was obtained.

Low-cycle fatigue behaviors of 316L austenitic stainless steel in high temperature water: Effects of pre-soaking, dissolved oxygen, and boric acid & lithium hydroxide

  • Xiong, Yida;Watanabe, Yutaka;Shibayama, Yuki;Zhong, Xiangyu;Mary, Nicolas
    • Nuclear Engineering and Technology
    • /
    • v.54 no.9
    • /
    • pp.3215-3224
    • /
    • 2022
  • Latest studies found that for 316LN austenitic stainless steel (ASS), its LCF life decreased noticeably in high temperature water containing a great amount of dissolved oxygen (DO) (2 ppm DO), compared with that in the water containing 50 or 100 ppb DO. This finding is different from previous studies about ASSs. This study confirmed that the 316L had similar behavior to 316LN. The LCF life of 316L in water containing 1000 ppb DO water was considerably shorter than that in the water containing 50 ppb DO. Addition of boric acid & lithium hydroxide and pre-soaking did not display noticeable effects on the LCF life of this material in the water with 1000 ppb DO, indicating the discrepancy between the latest studies and previous studies was not caused by the boric acid & lithium hydroxide and pre-soaking. This study also confirmed that similar to 316LN, when a certain amount of DO was added into the water, the amount of hydrogen absorbed into the material decreased significantly compared with that when the DO was less than 5 ppb.

Characterization of Surface Films Formed Prior to Bulk Reduction of Lithium in Rigorously Dried Propylene Carbonate Solutions

  • Chang, Seok Gyun;Lee, Hyo Jung;Gang, Heon;Park, Su Mun
    • Bulletin of the Korean Chemical Society
    • /
    • v.22 no.5
    • /
    • pp.481-487
    • /
    • 2001
  • Surface films formed prior to bulk reduction of lithium have been studied at gold, platinum, and copper electrodes in rigorously dried propylene carbonate solutions using electrochemical quartz crystal microbalance (EQCM) and secondary ion mass spectrometry experiments. The results indicate that the passive film formation takes place at a potential as positive as about 2.0 V vs. Li/Li+ , and the passive film thus formed in this potential region is thicker than a monolayer. Quantitative analysis of the EQCM results indicates that electrogenerated lithium reacts with solvent molecules to produce a passive film consisting of lithium carbonate and other compounds of larger molecular weights. The presence of lithium carbonate is verified by SIMS, whereas the lithium compounds of low molecular weights, including lithium hydroxide and oxide, are not detected. Further lithium reduction takes place underneath the passive film at potentials lower than 1.2 V with a voltammetric current peak at about 0.6 V.

Study on the Precipitation of Magnesium Hydroxide from Brine (염수로부터 수산화마그네슘의 침전 특성 연구)

  • Seo, Bong Won;Song, Young-Jun;Lee, Gye Seung;Shin, Kang Ho;Jang, Yoon Ho;Kim, Youn-Che;Yoon, Si-Nae
    • Resources Recycling
    • /
    • v.23 no.3
    • /
    • pp.21-29
    • /
    • 2014
  • This study was conducted to obtain the basic data for designing the lithium recovery process from the "salar de Uyuni" in Bolivia. For this study, the mock brine which has the similar chemical composition with the brine of "salar de Uyuni" was prepared, and the effects of reaction factors such as temperature, time, pH and so forth on the precitation reaction of magnesium hydroxide were investigated.