215 results about "Salt lake" patented technology

The invention discloses a salt lake brine mining method and system for hydraulically gradient-driven water replenishing and ore dissolving of a sedimentation funnel, and relates to the technical field of salt lake mineral resource development, the method comprises the following steps: S1, collecting water level data of a sedimentation funnel area, calculating gradient distribution, dividing functional areas, and generating zoning parameters; s2, based on the partition parameters, a water injection well network is arranged in the gradient direction, water injection parameters are determined according to the water level difference, and a well network scheme is generated; s3, based on a well pattern scheme, injecting the proportioning solvent into an ore bed in a layered manner to form a directional seepage field, and generating solute transport data; s4, on the basis of solute transport data, enriched brine is extracted in the collection area, the concentration is monitored, and brine parameters are generated; and S5, based on the deviation between the brine parameter and the target value, calculating the regulation amount, adjusting the injection-production parameter to maintain dynamic balance, and outputting the salt lake brine with the target concentration. By regulating and controlling the hydraulic gradient, the form of the settlement funnel is stabilized, the phenomena of stratum disturbance and ground settlement are reduced, and the ecological risk is reduced.

The invention discloses a salt lake carbonate rock multi-parameter quantitative classification and reservoir evaluation method, and relates to the technical field of oil-gas exploration. The method comprises the following steps: selecting a key well in an exploration block, collecting a plurality of salt lake carbonate rock samples, preparing an analysis sample under an anhydrous condition, quantitatively measuring a salinity parameter, a mixing index and a diagenesis strength parameter by utilizing the analysis sample, and determining a salinity code, a mixing code and a diagenesis phase code. And naming the salt lake carbonate rock based on the salinity code, the mixed product code and the lithogenous phase code, directly evaluating the salt lake carbonate rock reservoir according to a naming result, and performing single well comprehensive evaluation on the salt lake carbonate rock reservoir. According to the method, the influence of salinity, mixed accumulation and diagenesis strength on formation and evolution of the salt lake carbonate rocks is fully considered, accurate division of the types of the salt lake carbonate rocks is achieved, the reservoir naming result is directly associated with reservoir evaluation, and technical support is provided for standardized evaluation of the salt lake carbonate reservoir.

The invention discloses an adsorption / desorption device for salt lake adsorption and lithium extraction and application thereof.The adsorption / desorption device for salt lake adsorption and lithium extraction comprises an adsorption and desorption column, an adsorbent containing area used for containing an adsorbent is arranged in the adsorption and desorption column, and a positive electrode and a negative electrode are oppositely arranged in the adsorbent containing area; the positive electrode and the negative electrode are connected through a direct-current power supply capable of reversing poles, a variable electric field can be formed during pole reversing, and the variable electric field can drive lithium ions to migrate and accelerate desorption of the lithium ions from an adsorbent, so that the lithium ion desorption efficiency is favorably improved, the concentration of the lithium ions in a desorption solution is higher, fresh water is saved, and the service life of the lithium ion battery is prolonged. And time and energy consumption are saved for subsequent concentration of lithium ions. The adsorption / desorption device for adsorbing and extracting lithium in the salt lake is simple in process flow and simple and convenient to operate, can effectively improve the desorption efficiency and save working hours, energy and fresh water, and has practical significance on utilization of lithium resources in the salt lake.

The utility model discloses a salt lake lithium extraction adsorbent scrubbing system which comprises a scrubbing tower and an adsorption tower, and a sunken water distributor is arranged at the bottom end in the scrubbing tower; the middle position of the bottom of the concave water distributor penetrates through the bottom of the scrubbing tower and is connected with a runner opening; a water replenishing opening is formed in the middle of the bottom of the scrubbing tower; two feed ports are formed in the positions, close to the water inlet, of one side of the scrubbing tower, and a water outlet is formed in the position, close to the top, of one side of the scrubbing tower; the flow channel port is sequentially connected with a pneumatic valve j, a diaphragm pump B and an adsorption column through a pipeline; according to the system, crushed resin particles and impurities are effectively removed by cleaning an adsorbent, so that the adsorption performance and the flowability of a resin bed layer are recovered, and it is ensured that the resin bed layer is always in the optimal working state. In the process of scrubbing the adsorbent, the adsorbent does not need to be manually carried except for necessary adsorption tower pipeline connection operation, so that the scrubbing efficiency is remarkably improved.

A new method for extracting lithium from salt lake brine, comprising the following steps: a salt lake old brine raw material, desorption liquid, low-magnesium water, and adsorption tail liquid pass through an old brine feeding pipe (2), a desorption liquid feeding pipe (4), a low-magnesium water top desorption liquid feeding pipe (3), and an adsorption tail liquid top desorption liquid feeding pipe (11), respectively, which are located above and below a rotary disc of a multi-way valve system (1); and after respectively entering corresponding adsorption columns (6) by means of a duct and channel within the multi-way valve system (1), the entire process procedure is completed from an adsorption tail liquid discharge pipe (7), a qualified desorption liquid discharge pipe (10), a lithium-containing old brine discharge pipe (8), and an adsorption tail liquid top desorption liquid discharge pipe (5); and the adsorption columns (6) are connected in series or in parallel by means of channels located in the multi-way valve system (1). The feature in which a multi-way valve device is simple and easy to operate is utilized, and in comparison with a fixed bed operating system, the utilization rate of lithium adsorbent may be increased by over 20%, the utilization efficiency of the lithium adsorbent may be increased by over 40%, and production costs may be reduced by 30-50%. Therefore, the stability of a qualified desorption liquid is improved, stable production is guaranteed, and year-round constant operation may be achieved.

The invention discloses a salicylic acid anchored hydrotalcite-bentonite composite material based on salt lake bischofite as well as a preparation method and application thereof, and belongs to the technical field of preparation and application of heavy metal adsorbents. According to the invention, salt lake bischofite is used as a magnesium source, is purified and then is mixed with aluminum chloride hexahydrate, salicylic acid, bentonite and an alkaline reagent, and the composite material is prepared through a heating and pressurizing reaction. According to the material, bentonite serves as a substrate, magnesium-aluminum hydrotalcite grows on the surface, carboxyl, phenolic hydroxyl and other functional groups are anchored through flocculation and electrostatic adsorption, and the complexing capacity on heavy metal ions is synergistically enhanced. Compared with traditional hydrotalcite, the composite material has higher specific surface area, larger adsorption capacity and regeneration stability, and can efficiently remove lead ion pollution in water. The method realizes high-value utilization of salt lake magnesium resources, provides a novel adsorption material for heavy metal treatment, and has environmental protection benefits and application values.

The invention discloses a phenazine-based electrochemical electrode material as well as a preparation method and application thereof. The phenazine-based electrochemical electrode material is an organic small molecule material or an organic polymer which contains nitrogen, has a conjugated structure and can be subjected to electrochemical oxidation-reduction reaction. The phenazine-based electrochemical electrode material disclosed by the invention can be applied to selective separation and extraction of ions, can be used for selective extraction and separation of target ions in a multi-ion complex solution, and can be used for extracting valuable element ions step by step at high performance; the extraction method has the advantages of high ion extraction capacity, low cost, simple process and high element separation and extraction efficiency, is environment-friendly, can realize efficient development and comprehensive utilization in the fields of salt lake resources, marine resources, industrial sewage and wastewater recycling, seawater desalination and the like, and has a better industrialization prospect.

The present invention relates to a salt lake lithium extraction process involving low water consumption and a device, and belongs to the technical field of salt lake lithium extraction. The present technical solution comprises performing pretreatment on wastewater in a process, which comprises impurity removal and concentration; and then evaporating water in the wastewater by means of evaporation, so as to obtain recyclable water. In this way, water in wastewater is effectively recycled, thus reducing the consumption of water resources.

The invention belongs to the technical field of membrane separation, and particularly relates to a preparation method of a self-supporting polypyrrole composite membrane and application of the self-supporting polypyrrole composite membrane in extraction of lithium from a salt lake. A polyoxazole polyhydrazide copolymer is used as a porous self-supporting base membrane, and a continuous polypyrrole functional layer is constructed on the surface of the base membrane through in-situ oxidative polymerization. A dynamic charge screening microenvironment is formed by a weak positive electricity characteristic and a highly conjugated structure in a polypyrrole molecular chain, and the interception efficiency on high-charge-density magnesium ions is enhanced through electrostatic interaction; and meanwhile, the rigid pore structure realizes selective permeation of lithium ions through size screening. Under the assistance of an external electric field, the polypyrrole layer shows excellent magnesium-lithium separation performance, lithium ions are enriched and recycled from the salt lake brine with the high Mg < 2 + > / Li < + > molar ratio, and the industrial bottleneck that ion flux and selectivity are difficult to consider at the same time in a traditional separation technology is solved.

The invention discloses a roasting system for leaching and lithium extraction of salt lake deposited clay type lithium ores, and belongs to the technical field of salt lake resource development and lithium extraction, the roasting system comprises a rack, the rack is provided with a preheating mechanism, a rotary driving mechanism and a roasting box, the preheating mechanism is used for preheating the leached salt lake deposited clay type lithium ores, and the rotary driving mechanism is used for driving the roasting box to rotate; the preheating mechanism is composed of a charging barrel, a lower conical barrel, a communicating pipe and a preheating box, a first rotating guide ring is arranged at the lower end of the charging barrel, and a first guide ring cavity is formed in an upper cavity opening of the lower conical barrel; the lower conical barrel adopts a rotating mode, and a matching structure of a first rotating guide ring at the lower end of the matched charging barrel and a first guide ring cavity at an upper cavity opening of the lower conical barrel is adopted, so that continuous circumferential shearing force and radial pushing force can be generated on the lithium ore which is high in viscosity and easy to cake after leaching, and the lithium ore is turned over along the inner wall of the conical barrel through rotation; local accumulation dead angles are avoided, and the problem that materials are bonded and blocked in a traditional fixing structure is solved.

The application relates to the technical field of brine refining equipment, and discloses a brine refining equipment for lithium extraction from salt lakes, which comprises a precipitation tank, the bottom of the precipitation tank is fixedly connected with a support frame one, and the side wall of the precipitation tank is fixedly connected with a fixing frame. In view of the problem that the excessively long precipitation distance leads to excessively long precipitation time, five groups of collecting assemblies are arranged in the equipment, the five groups of collecting assemblies divide the precipitation tank into six layers stacked up and down, when the brine enters the inside of the precipitation tank and is uniformly distributed in the six layers, the brine in the inside of the precipitation tank will be precipitated, and the precipitate will penetrate through the turbine plate and accumulate on the top of the inclined plate. In this process, the precipitate will be precipitated at the position of the corresponding inclined plate. Through the design that the six layers simultaneously precipitate, the single precipitation time of the precipitation tank is shortened, and the single precipitation time of the equipment is greatly reduced.

The invention provides a multi-electric-layer nanofiltration membrane for extracting lithium from a salt lake and a preparation method of the multi-electric-layer nanofiltration membrane, and belongs to the technical field of nanofiltration membranes. Firstly, polysulfone and dimethylformamide are put into a mixing kettle, and a membrane casting solution is obtained; coating a non-woven fabric with the membrane casting solution, and then preparing a non-woven fabric and polysulfone combined base membrane through phase inversion; soaking the base membrane in an isopropanol solution, and removing redundant solution on the surface by using a rubber roller; the preparation method comprises the following steps: coating the surface of a base membrane with a solution of a water phase 2, then removing the redundant water phase on the surface, then coating the surface with an oil phase 2, drying a membrane, sequentially and repeatedly coating the membrane with the water phase 2 and the oil phase 2 for multiple times to obtain a nanofiltration membrane with multiple middle layers, then coating the membrane with a solution of a water phase 1, removing the redundant water phase on the surface, then coating the surface with an oil phase 1, and drying to obtain the nanofiltration membrane with multiple electric layers. According to the invention, a plurality of middle layers are positively charged, so that the electrostatic repulsion effect on magnesium ions can be fully exerted, and the magnesium ion interception is obviously improved.

The invention belongs to the technical field of adsorption materials for extracting lithium from salt lake brine, and provides a ternary vanadium-titanium-niobium lithium ion sieve based on a biomimetic mineralization template and a lithium extraction device and a lithium extraction process thereof aiming at the bottleneck problems of low adsorption capacity, poor magnesium-lithium selectivity, short cycle life and the like of the existing titanium-based lithium ion sieve. The lithium ion sieve material with an anatase-brookite mixed crystal structure and three-stage through pore channels is constructed by coupling vanadium and niobium elements with a multi-stage atmosphere regulation gradient calcination process method. According to the technology, the oxygen vacancy concentration, the ion diffusion kinetics and the structural stability of the material are remarkably improved. The invention provides a novel adsorbing material solution with high adsorbability, optimization and long circularity for extracting lithium from salt lake brine with high magnesium-lithium ratio, and has important application value in the fields of promoting green and efficient development of salt lake lithium resources and new energy strategic resource recovery.

The invention provides a salt lake resource dynamic monitoring system based on a Kriging interpolation method. Comprising a drilling deployment module, a resource reserve initial exploration module, a multi-source data acquisition and preprocessing module, a spatial interpolation algorithm module and a three-dimensional visual modeling and rendering module. According to the method, the Kriging interpolation method and the Co-Kriging interpolation method are combined, the main and auxiliary variable spatial correlation is utilized to improve the reserve estimation accuracy, the limitation of dependence on a large number of samples traditionally is broken through, center encryption and peripheral control drill hole arrangement is combined with uncertainty evaluation to optimize the exploration cost, comprehensive evaluation is supported by a small number of samples, the model is dynamically updated by the system monthly, and the exploration efficiency is improved. The problem of traditional data lag is solved, the resource dynamic state is visually presented through the three-dimensional visual modeling and rendering module, a basis is provided for decision making, the resource utilization rate is improved, and premature exhaustion is avoided.

The invention belongs to the technical field of salt lake resource development and rare metal recovery, and discloses a fibrous rubidium adsorbent as well as a preparation method and application thereof, a metal-based Prussian blue analogue spinning solution is synthesized in a non-aqueous system through a one-pot method, and the fibrous rubidium adsorbent is directly prepared through wet spinning. The preparation of the powder adsorbent and the molding of the composite material are integrated, so that the process is simplified, and the problem of powder agglomeration is avoided. The prepared fibrous rubidium adsorbent has the rubidium ion adsorption capacity of 248.73 mg / L, achieves adsorption equilibrium within 7 min, is suitable for industrially recovering rubidium from high-salinity salt lake brine, and has remarkable economic and environmental benefits.

The utility model discloses a salt lake lithium extraction crystallization matrix assembly, relates to the field of salt lake lithium extraction process equipment, and can solve the problem of low lithium carbonate crystallization efficiency caused by the fact that a three-dimensional crystallization nucleation matrix is fixedly arranged in a solar pond in the prior art. The salt lake lithium extraction crystallization base body assembly comprises a three-dimensional support arranged in brine in a solar pond and a plurality of base bodies connected to the three-dimensional support and used for providing a solid-liquid contact surface for lithium carbonate crystallization. The driving device is connected to the pond bank of the solar pond; and the driving rod is connected between the output end of the driving device and the three-dimensional bracket and is used for driving the three-dimensional bracket to swing back and forth in cooperation with the driving device.

The present invention discloses a nanofiltration membrane assembly for lithium extraction from salt lakes and a preparation device thereof, comprising a filter membrane main body and a coiled tube, and also comprising a detection assembly, which is used for detecting the use status of the filter membrane main body; a water outlet end cover and a water inlet end cover are respectively provided at both ends of the coiled tube, a guide tube is fixedly provided on the water inlet end cover, the detection assembly comprises a detection tube slidably sealed and arranged on the guide tube, an observation column is provided on the detection tube, and a detection assembly and a buffer assembly are provided on the water inlet end cover; when the filtering capacity of the filter membrane main body decreases, the pressure inside the coiled tube increases, pushing the buffer assembly to drive the observation column to slide, and the filtering capacity of the filter membrane main body can be fed back to the outside through the observation column, thereby facilitating the external judgment of the use degree of the filter membrane main body, so that the filter membrane main body can be accurately replaced after a certain degree of use, avoiding excessive or incomplete use of the filter membrane main body, resulting in reduced use effect of the filter membrane main body.

The invention discloses a method for preparing a humic acid anchored hydrotalcite coated Fe3O4 magnetic material based on salt lake bischofite and application, and belongs to the technical field of heavy metal adsorbents. The method comprises the following steps: preparing high-purity magnesium chloride hexahydrate by taking salt lake bischofite as a raw material, mixing with an aluminum source, hydrolyzing to generate a hydrotalcite precursor, and decomposing the nitrogen source to provide an alkaline environment to promote formation of a layered structure; humic acid is chelated with heavy metals through functional groups and is stably anchored on the surface of hydrotalcite, Fe3O4 is used as a magnetic substrate, the material is endowed with magnetism, and a hydrothermal one-step in-situ growth composite structure is realized. The composite material combines the advantages of humic acid, hydrotalcite and Fe3O4, the adsorption capacity is remarkably improved, chemical adsorption is enhanced, efficient solid-liquid separation is achieved, and the defects of traditional materials are overcome. When the bischofite is used as a heavy metal adsorbent, lead ions can be efficiently removed and rapidly recovered, the steps are simple, the cost is low, the effect is remarkable, a new way is developed for utilization of the bischofite in the salt lake, and the bischofite has subject and application values.

The invention relates to the technical field of metal extraction, in particular to a process for extracting magnesium from taupe salt lake clay containing magnesium in multiple occurrence states. A technology for extracting magnesium from taupe salt lake clay containing multi-occurrence-state magnesium is characterized by comprising the following steps that the salt lake clay is crushed and sieved, then fine particles are soaked in a leaching agent, and leaching liquid containing the magnesium element is obtained through filtering; wherein the leaching agent is prepared from concentrated hydrochloric acid, concentrated sulfuric acid and low-salinity water, and the volume ratio of the concentrated hydrochloric acid to the concentrated sulfuric acid to the low-salinity water is (0.05-0.15): (0.05-0.15): 0.8; the low-salinity water is natural water of the horse-sea basin. According to the method, the low-salinity water and the mixed acid (sulfuric acid and hydrochloric acid) are adopted to prepare the composite extracting agent, the efficient leaching rate is achieved through the multiple cooperation mechanisms of Cl <-> competitive adsorption replacement, sulfate radical complexing dissolution and the ultrasonic cavitation effect, the leaching capacity is greatly improved compared with a single water body technology, and meanwhile acid wastewater discharge is reduced.

The invention discloses a novel salt lake lithium extraction process for efficient and balanced utilization of energy, and belongs to the technical field of preparation of new energy materials. The process comprises the following heat recovery and utilization steps: S1, low-grade heat recovery: adopting raw water of production water as cooling water, and recovering heat in the following procedures: an adsorption lithium extraction procedure, an electrodialysis procedure and a nanofiltration reverse osmosis procedure; s2, medium-grade heat recovery: feeding the production water with recovered low-grade heat or / and reverse osmosis fresh water as a byproduct of the nanofiltration reverse osmosis process into the following processes for continuously absorbing heat: a lithium carbonate process cooling section, an air compression process, a concentration process and a mother liquor recovery process; and S3, heat utilization: taking the production water or / and reverse osmosis fresh water from which the medium-grade heat is recovered as thermal desorption water, and feeding the thermal desorption water into an adsorption lithium extraction process. According to the invention, the application of a circulating-water-free cooling system is realized in the salt lake lithium extraction process for the first time, the investment cost and the occupied area are reduced, and the subversive innovation of the traditional process is realized.

The invention relates to the technical field of construction engineering foundation treatment, in particular to a foundation structure based on a high-saturation brine crystallization technology and a construction method of the foundation structure. The foundation structure comprises a basic primary salt rock bearing layer, a bottom framework cementing layer and a surface sand gravel compensation layer. As the magmatic rocks are very hard, high in density and enough in salt lake chemical environment resistance, the magmatic rocks are directly put into a hypersalinity brine area to form a rigid framework, framework building-in, gap filling and overall cementing are achieved through natural crystallization of salt lake hypersalinity brine, and a core rigid framework of the foundation is formed; the structure can be connected with a primary salt rock bearing layer of a lower foundation to form a stress transmission system, can resist soaking erosion caused by conventional fluctuation of the brine water level, has anti-floating and anti-seepage dual performance, can improve the foundation bearing capacity and the anti-settling capacity, and enables a building newly built on a salt lake to be more stable. Meanwhile, the magmatic rocks are natural materials, so that the salt lake environment is not polluted, and the environmental protection property is good.

The application discloses a self-supporting fracturing fluid system prepared by using various natural salt water and application thereof, and provides a self-supporting fracturing fluid system for development of geological energy (in particular, oil and gas, geothermal energy and natural gas hydrate), which is not affected by ion concentration in seawater, salt lake water and surface water, has low requirement on water source, can be prepared by using various types and concentrations of mineralization water source at the same time, and can be directly prepared by using various surface water to prepare the self-supporting fracturing fluid system, so that the requirement of water source for fracturing technology in areas lacking fresh water is met.

The invention provides a clamp for salt lake loose sample CT scanning and a clamping method, and the clamp for salt lake loose sample CT scanning comprises a base which is rotatably arranged around an axis parallel to a first direction; the containing assembly is arranged on one side of the base, and a containing part is hollow; the sample tank is arranged in the accommodating part; the sample tank comprises a tank body, a flexible part and an inflation assembly, an opening is formed in the top of the tank body, the edge of the flexible part is in sealed connection with the inner side of the top of the tank body, a space defined by the flexible part and the tank body is communicated with the inflation assembly, and the middle of the flexible part is connected with the bottom of the tank body, so that the flexible part is in an inverted cone shape and is used for containing a tested sample; and the connecting assembly is arranged on the containing assembly, and the base and the containing assembly are detachably connected through the connecting assembly. Damage to the salt lake loose sample can be reduced, scanning is carried out on the premise that the salt lake loose sample is kept stable and not prone to changing the morphological structure, and the quality of data obtained through CT scanning is improved.

The invention provides a brine salt production system optimization technology innovation integration before drying of periodic drought and flood alternation type salt lake ecological management, belongs to the technical field of salt lake ecological management and resource comprehensive utilization, and particularly relates to a brine salt production system optimization technology innovation integration before drying of periodic drought and flood alternation type salt lakes by taking ecological management as a primary task and in a window period before drying of the periodic drought and flood alternation type salt lakes. Through digital regulation and control and multi-technology system optimization integration, the integrated system and method for reducing the source of salt-alkali dust storm, recovering high-value salt resources, realizing zero emission of old brine and quickly recovering an ecological base are realized. The integrated system has the following remarkable benefits: the ecological benefits are excellent: white tornado type salt-alkali dust storm formed after the periodic drought and flood alternating type salt lake is dried up is effectively eradicated, the discharge flux of the salt-alkali dust is reduced to be less than or equal to 5 mu gms, and the dust source reduction rate is gt; 92%; after treatment, the vegetation coverage rate of the lake basin is not less than 40% in one year and not less than 70% in three years. The recovery rate of NaSOis is not less than 90%, and the recovery rate of NaCl is not less than 85%.

A salt lake deep rock salt mining method belongs to the field of salt lake mining, and comprises the following steps: detecting crack distribution of an underground rock salt layer by using a geological radar, opening cracks by using a drilling method to form grouting drill holes, and injecting modified bentonite slurry into the grouting drill holes to make the modified bentonite slurry fully permeate into the rock salt cracks, so as to form a rock salt layer; further, rock salt cracks are damaged after the modified bentonite in the modified bentonite slurry loses efficacy; and drilling and digging the grouting hole by using a drill bit, cooling the drill bit by using bentonite slurry as circulating liquid in the drilling and digging process, collecting the circulating liquid, and airing to separate out salt, thereby completing deep rock salt mining. The bentonite slurry is used as circulating liquid, the drill bit is effectively cooled, the absorptivity of salt is greatly improved, salt dissipation is reduced, compared with a traditional mining method, the mining depth can be expanded to 5 m or below, and a revolutionary scheme is provided for efficient and sustainable development of salt lake resources.

The invention discloses a salt lake brine comprehensive recovery method and system, and belongs to the technical field of salt lake resource utilization. The method comprises the following steps: performing ammonia precipitation reaction on salt lake brine and an ammonia precipitator, and then filtering and washing to obtain Mg (OH) 2 and ammonia precipitation filtrate; carrying out dehydration and roasting treatment on Mg (OH) 2 to obtain an active MgO product; introducing carrier gas into the ammonia precipitation filtrate under a negative pressure condition to perform deamination treatment, and crystallizing and drying the deaminated filtrate to obtain an ammonium chloride product; and returning ammonia gas recovered by deamination treatment to an ammonia precipitation reaction section for cyclic utilization, and recycling water obtained by crystallization and drying to a filtering and washing section for cyclic utilization. The method provided by the invention has the advantages of short process flow, low energy consumption, continuous production, increased yield, no generation of waste liquid and waste residue, and no environmental pollution, realizes efficient preparation and recovery of active magnesium oxide and ammonium chloride, and realizes efficient utilization and zero emission of salt lake brine.

The application relates to the technical field of refractory material preparation, and particularly discloses a preparation method of high-purity high-bulk-density sintered magnesia from salt lake. The method uses magnesium hydroxide produced by salt lake bischofite as raw material, obtains high-purity magnesium oxide powder through suspension furnace light burning, and then sequentially goes through fine grinding, ball pressing, maintenance, high-temperature calcination under oxygen-rich conditions and cooling to obtain sintered magnesia with high purity and high bulk density. By controlling the particle size and burning vector in the fine grinding process, introducing pre-pressing and exhaust devices in the ball pressing link, using shaft kiln waste heat in the maintenance link, combining the shaft kiln staged preheating-calcining-cooling process and oxygen-rich combustion conditions, the compressive strength and forming stability of the ball material can be significantly improved, and the densification and uniformity of the calcining process can be ensured. The method can fully utilize the salt lake magnesium resources, reduce the dependence on magnesite, and the prepared sintered magnesia has excellent performance of MgO content being greater than or equal to 99.0%, bulk density being greater than or equal to 3.40 g / cm 3 , and can meet the application requirements of high-end refractory materials.

This invention discloses a method for preparing high-purity lithium phosphate using lithium precipitation mother liquor from salt lake brine. The method includes: placing the lithium precipitation mother liquor from salt lake brine and a dispersant in a closed reaction apparatus and heating to 70℃-95℃; then introducing a phosphoric acid solution and performing a crystallization lithium precipitation reaction followed by aging to obtain crude lithium phosphate; wherein the dispersant includes an ethylene glycol polymer; purifying and drying the crude lithium phosphate to obtain high-purity lithium phosphate. The method provided by this invention features simple process, high lithium yield, controllable crystallization process, high product purity, single raw material usage, economic rationality, and environmental friendliness, which is beneficial for the high-value, efficient, and sustainable development and utilization of salt lake resources.

This invention belongs to the field of lithium extraction technology from salt lakes, specifically relating to a manganese dioxide-coated manganese-based lithium adsorbent, its preparation method, and its application. This invention utilizes spherical manganese carbonate to prepare a precursor for the manganese-based lithium adsorbent, and then further achieves manganese dioxide coating modification through low-temperature redox technology to obtain a manganese dioxide-coated manganese-based lithium adsorbent. The resulting manganese dioxide-coated manganese-based lithium adsorbent can achieve highly efficient lithium extraction from salt lake brines with a high magnesium-to-lithium ratio, while also possessing advantages such as low manganese loss rate (<1.5%), strong recyclability, and low preparation cost, thus having broad application value.

The invention provides a method for preparing sodium carbonate from salt lake lithium extraction waste liquid. The method comprises the following steps: S1, carrying out first nanofiltration on the salt lake lithium extraction waste liquid to obtain first nanofiltration material liquid and first nanofiltration waste liquid; s2, the first nanofiltration material liquid is subjected to permeation, and permeation material liquid and permeation waste liquid are obtained; s3, adjusting the pH value of the transparent material liquid to obtain a pretreated transparent material liquid, and carrying out second nanofiltration on the pretreated transparent material liquid to obtain a second nanofiltration material liquid and a second nanofiltration waste liquid; s4, performing monovalent ion selective electrodialysis treatment on the second nanofiltration material liquid to obtain electrodialysis material liquid and electrodialysis waste liquid; and S5, sequentially carrying out evaporation concentration and cooling crystallization on the electrodialysis feed liquid to obtain sodium carbonate crystals. The method is simple in process flow, low in raw material cost and environment-friendly, the comprehensive utilization efficiency and economic benefits of salt lake resources can be remarkably improved, and the method has important industrial application value and wide market prospects.