The tempo-spatial characteristics and forming mechanism of Lithium-rich brines in China

With the technological development of exploitation and separation,the primary source of lithium has gradually changed from ore to brine,which has become the main raw material,accounting for more than 80% of the total production.Resources of lithium-bearing brine are abundant in China.This paper has summarized the spatial and temporal distribution,characteristics,and formation mechanism of the lithium-rich brine in China,aiming to provide a comprehensive set of guidelines for future lithium exploitation from brines.Lithium brines usually exist in modem saline lakes and deep underground sedimentary rocks as subsurface brines.The metallogenic epoch of China's lithium-rich brine spans from the Triassic to the Quaternary,and these brines exhibit obvious regional distribution characteristics.Modem lithium-rich saline lakes are predominately located in the Qinghai-Tibet Plateau.In comparison,the subsurface lithium-rich brines are mainly distributed in the sedimentary basins of Sichuan,Hubei,Jiangxi,and the western part of the Qaidam Basin.Lithium-rich saline lakes are chloride-enriched,sulfate-enriched,and carbonateenriched,while the deep lithium-rich brines are mainly chloride-enriched.On the whole,the value of Mg/Li in deep brine is generally lower than that of brine in saline lakes.The genesis of lithium-rich brines in China is not uniform,generally there are two processes,which are respectively suitable for salt lakes and deep brine.

3-Phase Modeling for the Origin of Chinese Lithium-Rich Brines

There are significantly different origins and mineralizations among various lithium-rich brines of the world.As for Clayton Valley,Nevada,the data and interpretations recently presented suggest that the model

Hydrochemical Characteristics and Evolution of Underground Brine in Lop Nur,Northwestern China

Lop Nur is located at the eastmost end of the Tarim Basin in Xinjiang,Northwestern China.This study reviews the hydrochemical characteristics and evolution of underground brine in Lop Nur,based on analytical data from 429 water samples(mainly brine).It is found that in the NE-SW direction,from the periphery to the Luobei sub-depression,while the hydrochemical type varies from the sodium sulfate subtype(S)to the magnesium sulfate subtype(M),the corresponding brine in the phase diagram transfers from the thenardite phase(Then)area,through the bloedite phase(Blo),epsomite phase(Eps),picromerite phase(Picro),finally reaching the sylvite phase(Syl)area.As for the degree of evolution,the sequence is the periphery<Luobei horizontally and the overlying glauberite brine<the underlying clastic brine vertically.It is concluded that the oxygen and hydrogen isotopic compositions of the brine have evidently been affected through the effects of evaporation and altitude,as well as the changes in local water circulation in recent years.Boron and chloride isotopic compositions show that the glauberite brine is formed under more arid conditions than the clastic one.The strontium isotopic composition indicates that the Lop Nur brine primarily originates from surface water;however,deep recharge may also be involved in the evolution of the brine,according to previous noble gas studies.It is confirmed that the brine in Lop Nur has become enriched with potassium prior to halite precipitation over the full course of the salt lake's evolution.Based on chemical compositions of brine from drillhole LDK01 and previous lithological studies,the evolution of the salt lake can be divided into three stages and it is inferred that the brine in Lop Nur may have undergone at least two significant concentration-dilution periods.

Suppress oxygen evolution of lithium-rich manganese-based cathode materials via an integrated strategy

Improving the reversibility of anionic redox and inhibiting irreversible oxygen evolution are the main challenges in the application of high reversible capacity Li-rich Mn-based cathode materials.A facile synchronous lithiation strategy combining the advantages of yttrium doping and LiYO_(2) surface coating is proposed.Yttrium doping effectively suppresses the oxygen evolution during the delithiation process by increasing the energy barrier of oxygen evolution reaction through strong Y–O bond energy.LiYO_(2) nanocoating has the function of structural constraint and protection,that protecting the lattice oxygen exposed to the surface,thus avoiding irreversible oxidation.As an Li^(+) conductor,LiYO_(2) nano-coating can provide a fast Li^(+) transfer channel,which enables the sample to have excellent rate performance.The synergistic effect of Y doping and nano-LiYO_(2) coating integration suppresses the oxygen release from the surface,accelerates the diffusion of Li^(+)from electrolyte to electrode and decreases the interfacial side reactions,enabling the lithium ion batteries to obtain good electrochemical performance.The lithium-ion full cell employing the Y-1 sample(cathode)and commercial graphite(anode)exhibit an excellent specific energy density of 442.9 Wh kg^(-1) at a current density of 0.1C,with very stable safety performance,which can be used in a wide temperature range(60 to-15℃)stable operation.This result illustrates a new integration strategy for advanced cathode materials to achieve high specific energy density.

Effects of conductive agent type on lithium extraction from salt lake brine with LiFePO_(4) electrodes

Electrochemical lithium extraction from salt lakes is an effective strategy for obtaining lithium at a low cost.Nevertheless,the elevated Mg:Li ratio and the presence of numerous coexisting ions in salt lake brines give rise to challenges,such as prolonged lithium extraction periods,diminished lithium extraction efficiency,and considerable environmental pollution.In this work,Li FePO4(LFP)served as the electrode material for electrochemical lithium extraction.The conductive network in the LFP electrode was optimized by adjusting the type of conductive agent.This approach resulted in high lithium extraction efficiency and extended cycle life.When the single conductive agent of acetylene black(AB)or multiwalled carbon nanotubes(MWCNTs)was replaced with the mixed conductive agent of AB/MWCNTs,the average diffusion coefficient of Li+in the electrode increased from 2.35×10^(-9)or 1.77×10^(-9)to 4.21×10^(-9)cm^(2)·s^(-1).At the current density of 20 mA·g^(-1),the average lithium extraction capacity per gram of LFP electrode increased from 30.36 mg with the single conductive agent(AB)to 35.62 mg with the mixed conductive agent(AB/MWCNTs).When the mixed conductive agent was used,the capacity retention of the electrode after 30 cycles reached 82.9%,which was considerably higher than the capacity retention of 65.8%obtained when the single AB was utilized.Meanwhile,the electrode with mixed conductive agent of AB/MWCNTs provided good cycling performance.When the conductive agent content decreased or the loading capacity increased,the electrode containing the mixed conductive agent continued to show excellent electrochemical performance.Furthermore,a self-designed,highly efficient,continuous lithium extraction device was constructed.The electrode utilizing the AB/MWCNT mixed conductive agent maintained excellent adsorption capacity and cycling performance in this device.This work provides a new perspective for the electrochemical extraction of lithium using LFP electrodes.

Construction of truncated-octahedral LiMn2O4 for battery-like electrochemical lithium recovery from brine

The extraction of lithium from salt lakes or seawater has attracted worldwide attention because of the explosive growth of global demand for lithium products. The LiMn_(2)O_(4)-based electrochemical lithium recovery system is one of the strongest candidates for commercial application due to its high inserted capacity and low energy consumption. However, the surface orientation of LiMn_(2)O_(4)that facilitates Li diffusion happens to be prone to manganese dissolution making it a great challenge to obtain high lithium inserted capacity and long life simultaneously. Herein, we address this problem by designing a truncated octahedral LiMn_(2)O_(4)(Tr-oh LMO) in which the dominant(111) facets minimize Mn dissolution while a small portion of(100) facets facilitate the Li diffusion. Thus, this Tr-oh LMO-based electrochemical lithium recovery system shows excellent Li recovery performance with high inserted capacity(20.25 mg g^(-1)per cycle) in simulated brine. In addition, the dissolution rate of manganese per 30 cycles is only 0.44% and the capacity maintained 85% of the initial after 30 cycles. These promising findings accelerate the practical application of LiMn_(2)O_(4)in electrochemical lithium recovery.

Facet-dependent Thermal and Electrochemical Degradation of Lithium-rich Layered Oxides

Lithium-rich layered oxides(LLOs)are promising candidate cathode materials for safe and inexpensive high-energy-density Li-ion batteries.However,oxygen dimers are formed from the cathode material through oxygen redox activity,which can result in morphological changes and structural transitions that cause performance deterioration and safety concerns.Herein,a flake-like LLO is prepared and aberration-corrected scanning transmission electron microscopy(STEM),in situ high-temperature X-ray diffraction(HT-XRD),and soft X-ray absorption spectrum(sXAS)are used to explore its crystal facet degradation behavior in terms of both thermal and electrochemical processes.Void-induced degradation behavior of LLO in different facet reveals significant anisotropy at high voltage.Particle degradation originates from side facets,such as the(010)facet,while the close(003)facet is stable.These results are further understood through ab initio molecular dynamics calculations,which show that oxygen atoms are lost from the{010}facets.Therefore,the facet degradation process is that oxygen molecular formed in the interlayer and accumulated in the ab plane during heating,which result in crevice-voids in the ab plane facets.The study reveals important aspects of the mechanism responsible for oxygen-anionic activity-based degradation of LLO cathode materials used in lithium-ion batteries.In particular,this study provides insight that enables precise and efficient measures to be taken to improve the thermal and electrochemical stability of an LLO.

Construction of porous disc-like lithium manganate for rapid and selective electrochemical lithium extraction from brine

In order to satisfy the growing global demand for lithium, selective extraction of lithium from brine has attracted extensive attention. LiMn_(2)O_(4)-based electrochemical lithium recovery system is one of the best choices for commercial applications because of its high selectivity and low energy consumption.However, the low ion diffusion coefficient of lithium manganate limits the further development of electrochemical lithium recovery system. In this work, a novel porous disc-like LiMn_(2)O_(4) was successfully synthesized for the first time via two-step annealing manganese(Ⅱ) precursors. The as-prepared LiMn_(2)O_(4) exhibits porous disc-like morphology, excellent crystallinity, high Li^(+)diffusion coefficient(average 7.6×10^(-9)cm^(2)·s^(-1)), high cycle stability(after 30 uninterrupted extraction and release cycles, the crystal structure hardly changed) and superior rate capacity(93.5% retention from 10-120 mA·g^(-1)). The porous structure and disc-like morphology further promote the contact between lithium ions and electrode materials. Therefore, the assembled electrochemical lithium extraction device with LiMn_(2)O_(4) as positive electrode and silver as negative electrode can realize the rapid and selective extraction of lithium in simulated brine(adsorption capacity of lithium can reach 4.85 mg·g^(-1) in 1 h). The mechanism of disc-like LiMn_(2)O_(4) in electrochemical lithium extraction was proposed based on the analysis of electrochemical characterization and quasi in situ XRD. This novel structure may further promote the practical application of electrochemical lithium extraction from brine.

In Search of Portable Water Supplies within a Brine and Mine Water-Invaded Region for Serving Some Communities around Ishiagu, Afikpo and Environs in Abakaliki Basin, Southeast Nigeria

The study investigates the hydrogeochemical characteristics of some towns in the Abakaliki Basin, comprising, Ishiagu, Aka Eze, Amaseri, Afikpo and Okposi communities, with the aim of sourcing for portable water in the area. The basin is underlain by Albian sediments, essentially shales, in the lowlands, which were affected by low-grade metamorphism that had produced slates. The highlands comprise basic intrusives from episodes of magmatism and metallic ore mineralisation. Injection of brines into the aquifer system and low, seasonal aquifer recharge from rainfall results in poor water quality in the area. The study analyzes the geochemical distribution in water sources in the area and identifies sources of pollutants to guide the better choice of portable water. Results of hydrogeochemical analysis of both surface and groundwater from the communities were compared with World Health Organization to identify portable water locations in the area. While the salt lake at Okposi is the main source of brine intrusion in the study area, the Pb/Zn mine at Ishiagu is the main source of mine-water pollution in the study area. Most chemical parameters, (especially Cl-, Na+, Ca2+, Mg2+, SO42-, HCO3-) maintain high concentrations within the salt lake area, with the values declining away from the salt lake. The main anthropogenic source of pollution in the area, especially at Ishiagu, is the indiscriminate surface mining of lead-zinc without proposer waste management practices. Possible sourcing for portable water in the study area includes a deep borehole at Ishiagu, away from lead-zinc intrusives. At the Okposi axis, searching for portable water in boreholes should target shallower aquifers that do not communicate with the deeper-seated brine zones, likewise targeting zones farther away from these brine-invaded areas. A controlled pumping rate could potentially ensure that the cone of depression was not low enough to reach the brine zone at depth. In addition, desalination could also potentially render the salt water drinkable if properly handled to eliminate the high concentration of salts in the water to the level of acceptable limit by the WHO. Based on the study, the best area to target for portable water in the study area is Afikpo, with most geochemical elements naturally occurring within WHO’s standard concentration while portable water could be harnessed in areas further away from mining sites, especially at deep groundwater.

四川盆地三叠系气田型深层富钾锂卤水勘探历程、进展与展望

四川盆地三叠系嘉陵江组和雷口坡组不仅是常规天然气的主要赋存层位,同时也形成和储存了富含钾锂等关键元素的卤水资源。本文梳理总结了四川盆地三叠系气田型深层卤水勘探进程、成因机理、富集规律方面的进展和认识,并对潜在的研究重点进行了展望。四川盆地三叠系气田型深层卤水中钾、锂等关键金属元素均达到了工业品位,随着全球对锂资源需求的增大,由起初的“气钾兼探”逐渐向“气钾锂综合勘探”过渡。四川盆地三叠系深层富钾锂卤水的成因机制大体上相同,其中干旱气候条件下古海水的蒸发浓缩致使卤水中的钾锂富集;高温高压下含钾/锂元素的杂卤石/绿豆岩与埋藏卤水发生水岩反应,进一步促进了钾锂的富集;淋滤作用也是卤水中钾元素富集的重要成因。深层卤水主要储集于各类白云岩中,其富集主要受断裂、裂缝发育带和背斜等构造控制,富集规律可归纳为“孔隙裂缝储卤、断裂运卤、背斜核部富卤”。基于目前四川盆地气田型深层卤水的勘探现状和不足,未来应该加强地球物理勘探集成新技术的研发、资源评价方法与体系的优化、含高品位伴生元素新层系的勘探以及气田型卤水有效开发利用技术的研究。未来有望在四川盆地气田型深层卤水继续取得新的找矿突破。

卤水表面附近盐岩结晶特征研究

【目的】为了弥补现代盐湖沉积考察中丢失的信息,获取盐岩动态结晶过程,指导古盐湖沉积研究。【方法】借助室内石盐蒸发实验,观察卤水蒸发过程中氯化钠结晶特征,分析石盐结晶与沉积环境之间的关系,为盐湖沉积模式建立提供参考。【结果与结论】石盐沉积位置受结晶习性影响,晶体可以在卤水界面之上沉积,其形成的动力除了蒸发泵作用外,还受空气湿度和石盐潮解共同控制;人字晶一般形成于漏斗晶基础之上,在发育空间受限时,绕不同漏斗晶核生长的纹层斜交后形成人字晶纹,两种晶型可以同时沉积于水面之上;盐湖干涸之前,可能经历岩层封锁水面的现象,并可能对临层的碎屑沉积物产生影响。

温度影响下罗布泊盐岩路基填料变形特性研究

为探明温度影响下盐岩路基填料变形特性,保障盐岩路基稳定性,促进盐岩在路基工程中资源化应用,全面分析了卤水及盐岩相变特征,基于正交试验方法探究了单次降温多因素交互作用下盐岩填料的变形规律,系统研究了多次冻融循环后盐岩填料盐胀累积规律,并基于试验段现场监测综合评价了盐湖区盐岩路基变形特征。结果表明:不同浓度卤水降温曲线均未出现明显过冷阶段,其降温曲线平衡及波动维持时间极为短暂,同时卤水相变温度随浓度增加而升高。盐岩填料的降温曲线存在显著的过冷及温度跳跃阶段,其相变温度随拌和卤水浓度增加而下降。单次降温作用下盐岩填料变形量介于-0.09~0.18 mm,各因素对盐岩填料变形的影响顺序为:上覆荷载>含卤水率>最大粒径>压实度。冻融循环作用下拌合卤水浓度越低,盐岩填料盐胀量越大;上覆荷载对盐岩填料盐胀抑制作用较强。实体工程现场监测表明随着监测时间增长盐岩路基变形呈现正弦波式周期性变化,且变形沿深度方向呈减小趋势,同时盐岩路基变形与温度具有较强的线性相关性。

卤水提锂多元新路径:技术、资源、环境和成本

传统沉淀法提锂生产周期长、不适用于低锂浓度卤水,盐湖提锂产量增长缓慢,难以满足新能源产业发展的需求。因此,开发高镁锂比卤水提锂新技术是锂产业发展的迫切需求。本文概述了吸附法、萃取法、膜法和电化学法等提锂新工艺的研究现状,发现铝基吸附剂已应用于工业生产,但其吸附容量显著地小于锰基和钛基吸附剂,而后两者的溶损和长吸附平衡时间是制约其产业化的关键。中性磷类萃取剂关注最多,但其易腐蚀和出现第三相;酰胺类萃取体系无腐蚀,已用于氯化物型卤水工业化提锂,但其稳定性需长期关注;并且萃取法工艺流程较长,酸碱消耗高。膜法无法深度除镁,需与其他方法相结合提锂,其水资源消耗量大。电渗析和“摇椅式”电化学实现了连续性提锂,加速了吸附速率,避免了洗脱剂的使用,其电耗随着优化提锂体系和工作条件的降低,电化学提锂将迎来广阔的产业前景。以上卤水提锂新工艺资源消耗和环境影响小于传统沉淀法,对高镁锂比盐湖具有显著的竞争优势,但各有弊端。因此,未来盐湖卤水提锂应加强多种新技术的集成与耦合,前移提锂过程,提升全流程锂的回收率和多种资源的综合开发。

盐湖卤水中硼酸盐化学形态及Raman光谱定量分析

我国青藏盐湖以富含硼锂而著称,卤水中硼化学赋存状态随湖水化学类型的不同而发生变化,其中以硫酸盐型盐湖卤水中硼酸盐的存在形式变化最为复杂,卤水蒸发过程一般不以固体盐形式结晶析出,而是以多硼物种形式富集于氯化镁饱和老卤中,表现出严重的过饱和性,对后续锂盐和镁盐的分离提取影响较大。开展盐湖卤水体系中硼酸盐化学形态、分布规律及离子间作用机制等溶液化学研究对盐湖资源高效开发具有重要的意义。相比常规拉曼光谱技术,拉曼积分球基于拉曼散射原理可极大地提高激发光的使用效率和拉曼散射信号,对硼酸盐溶液结构检测具有拉曼响应信号强、检出限低、信噪比高等优点,为盐卤复杂体系硼酸盐化学形态的定量分析奠定了基础。利用拉曼积分球开展了盐湖卤水硼酸盐化学形态研究,阐述了卤水蒸发过程多硼酸根离子的变化规律;同时借助响应曲面法进行实验设计与优化,建立了共存盐类干扰回归模型用于盐湖卤水中单硼物种B(OH)_(3)的准确测定。结果表明,盐湖卤水浓缩过程中硼不断聚合生成多聚度硼酸根离子如B_(3)O_(3)(OH)_(4)^(-)和B_(6)O_(7)(OH)_(7)^(2-)等,硼的化学形态变化规律与碱土金属如MgCl_(2)-MgO-2B_(2)O_(3)-H_(2)O体系中硼物种变化一致,但与碱金属溶液体系物种变化差别较大。回归模型对卤水中正硼酸B(OH)_(3)定量分析的相对误差小于5%,准确度较高;阐明了蒸发浓缩过程中B(OH)_(3)物种分布的变化规律,从定量视角初步阐述了卤水富集过程硼酸根离子间的聚合作用关系,可为后续开展盐卤体系多硼物种分布及作用机制研究提供新思路、新方法。

从高钙富硼老卤中提硼研究

以青海某高钙富硼老卤为研究对象开展了提硼研究。结果表明,合适的萃取条件为:磺化煤油为稀释剂、异辛醇用量50%、萃取相比1.0、萃取混合时间15 min;合适的反萃条件为:反萃剂为pH=1的稀盐酸、反萃相比1.5、反萃混合时间15 min。以此条件在5级混合澄清槽中完成了连续逆流萃取—反萃运转试验,连续运转45 h,硼萃取率为95.49%,硼与钾、钠、钙、镁的分离效果较好;硼反萃率为99.59%,反萃液中硼含量达17.17 g/L。采用“溶剂萃取—反萃—高温蒸发—低温冷却结晶—重溶—冷却结晶—过滤洗涤—干燥”工艺高效分离提取硼,硼总回收率为92.33%,制备出的硼酸产品达国家标准(GB/T 538—2018)要求。

造粒的氮掺杂碳纳米管基吸附剂对卤水中硼的吸附行为与机理

盐湖卤水中硼资源丰富,存在形式复杂多样,分离和回收硼的意义重大。基于N掺杂强静电与多羟基协同作用能够有效提高硼阴离子的分离机制,设计以水合肼为N源,多羟基的一维纳米材料碳纳米管(CNTs)为多羟基络合基,采用简单的一锅水热法合成了N掺杂的碳纳米管硼吸附材料(N-CNTs)。此外,以改性的聚丙烯腈为造粒剂,经造粒后,最大硼吸附容量为20.45 mg/g,特别在低浓度硼的分离中表现出优异的性能,这使N-CNTs成为硼的高效吸附材料。吸附机理为一维碳纳米管和改性聚丙烯腈的高比表面积上多羟基与N掺杂位置发生强静电协同增强络合吸附。硼吸附过程符合朗格缪尔吸附等温模型和准二阶动力学模型,在高浓盐多离子溶液中表现出优异的选择性硼吸附性能。该吸附剂在东台吉乃尔盐湖卤水中硼的吸附容量达18.92±1 mg/g,该技术在盐湖卤水及水处理行业具有较高的应用潜力。

溶析结晶用于盐湖卤水提钾和镁锂分离研究

采用溶析结晶法快速分离盐湖卤水中氯化钾并降低卤水中的镁锂比,解决青海盐湖盐田摊晒存在的生产周期长、需要修建大面积盐田等难题。以有机溶剂为溶析剂,考察了不同种类溶析剂加入量、溶析温度、溶析时间等对盐湖氯化钾收率及镁锂比的影响。实验结果表明,以无水乙醇为溶析剂与盐湖卤水体积比为2∶1,溶析温度为-15℃,时间为90 min时,氯化钾和氯化钠的收率分别达到93.15%和99.84%。溶析结晶后的母液经过过滤,在70~80℃,以0.5℃/min的降温速率进行动态降温,析出氯化镁晶体,镁锂质量比由原卤中的388.44降低至266.63,最终达到快速分离氯化钾的目的及为后续对镁锂进一步分离提供更有利的条件。

胜利探区油气共/伴生资源综合利用前景

胜利探区发现了多种油气共/伴生资源,部分为关系国防、农业、高科技等行业安全的战略资源,极具开发利用价值。针对目前研究较深入、已经工业化生产的氦气、卤水(钾盐)、铀矿等,分析了其在中国的勘探开发现状、在胜利探区的赋存特征、成矿条件及综合利用前景。研究结果表明:①氦气高异常主要分布在济阳坳陷、柴达木盆地的10余个地区,元古界—新生界的多个层位,具有与常规天然气、非烃气、页岩气等伴生的多种赋存类型。②济阳坳陷、柴达木盆地在古近纪—第四纪均具有发育卤水(钾盐)的古气候、古环境,其中东营凹陷油田水含有丰富的溴、锂、钾等,柴达木盆地的油田水中钾、锂较高,部分地区含量值达工业品位。③铀矿的主要类型为砂岩型,车排子凸起的多口井在白垩系、新近系呈现高异常自然伽马值,为最有利的伴生铀矿远景区;吐哈盆地、柴达木盆地及济阳坳陷的部分胜利探区也具有发育铀矿的铀源、构造、岩相、水文地质等成矿条件,部分井的自然伽马测井数据表现出高异常值。整体上胜利探区油气共/伴生资源具有类型多、分布层位多、异常区域广的特点。若充分利用胜利油田在勘探基础资料、地质基本认识、工程设施等方面的天然优势,尽快系统开展油气共/伴生资源成藏(矿)规律研究、资源潜力评价、提取工艺技术攻关等工作,有望将其发展成为新的业务增长极。

即食麻辣风味螺蛳卤水配方研制

主要探究不同风味物质及其比例对即食麻辣风味螺蛳卤水底料及卤水配方的品质影响,为开发简便、快速、口感统一麻辣风味螺蛳提供参考。通过单因素试验和正交试验相结合的方式考查了麻味调料、辣味调料、香辛味调料对即食麻辣风味螺蛳卤水底料品质的影响。结果表明,最佳配方为麻味调料添加量9%,辣味调料添加量45%,香辛味添加量6%。用同样的试验方法考查了卤水底料添加量、白砂糖添加量、食盐添加量对卤水品质的影响,结果表明,卤水的最佳配方为卤水底料添加量60%,白砂糖添加量2.0%,食盐添加量3.0%。在最佳配方下制作的产品均能达到预期的品质。

柴达木盆地卤水钾盐迁聚规律与找矿新突破

钾盐是我国大宗紧缺战略性“粮食”矿产,对保障国家粮食安全具有重要意义。我国钾盐资源具有需求量大、对外依存度高等特点,寻找新的钾盐矿床、形成新的大型钾盐资源基地刻不容缓。2023年,中国地质调查局组织开展青海柴达木盆地钾盐“增储保供”地质调查工作,在前期对柴达木盆地成盐聚钾规律性认识的基础上,于柴西北大浪滩—黑北凹地部署实施了“探采一体化”柴钾1井,钻获1021.95 m(井深111.54~1133.49 m)巨厚松散砂砾储卤层,全井段抽卤试验获日稳定涌水量8586 m^(3)/d、水位降深11.3 m、单位涌水量759.89 m^(3)/d·m、氯化钾平均含量为0.54%的高产工业品位“砂砾型”卤水钾矿,取得了柴达木盆地陆相深层卤水钾盐找矿新突破,为形成中国新的亿吨级大型钾盐基地夯实了资源基础。