504 results about "Salt lake brine" patented technology

The present invention relates to adsorption process of extracting lithium from salt lake brine, and the process is suitable for producing lithium carbonate and lithium chloride with lithium-containing Qinghai saline lake brine, including concentrated lithium-containing Qinghai saline lake brine. The process includes sun shining saline lake brine to obtain concentrated lithium containing brine, adsorption of lithium ion with aluminum salt adsorbent, eluting adsorbed lithium ion with water, and refining and concentrating the elutriant to obtain material for preparing lithium carbonate and lithium chloride.

The nanofiltration process is suitable for Mg-Li separation and Li enriching of Li containing bittern or Li containing solution from salt lake to prepare lithium carbonate or lithium chloride with the Li enriching bittern. Nanofiltration membrane is used in separating and enriching lithium from lithium containing bittern, which contains Mg, Ca and other cations and sulfate radical and other anions and has Li ion concentration of 0.1-11.5 g/L and Mg/Li ion weight ratio 1-200, to obtain lithium enriched bittern suitable for preparing lithium carbonate or lithium chloride. The said process is effective, and can obtain lithium enriched bittern with Mg/Li ion weight ratio 0.6-5 and Li ion content of 0.6-20 g/L.

The invention discloses a method for extracting high-value alkali metal from salt lake brine or seawater through membrane extraction-back extraction. The method is implemented through continuous operation and comprises the following steps of: fixing an ion exchange blend membrane in a membrane component, allowing an organic solution containing an extracting agent to contact salt lake brine or seawater which contains alkali metal ions by a first ion exchange membrane, and allowing alkali metal ions to pass through the ion exchange membrane and be combined with the organic solution containing the extracting agent to obtain metal complex; then transmitting an organic solution of the metal complex to a second ion exchange membrane and allowing the organic solution of the metal complex to contact a back extraction solution by the second ion exchange membrane, and allowing the metal ions to pass through the ion exchange membrane to enter the back extraction solution; during membrane extraction-back extraction, and circulating feed liquid, the back extraction solution and the organic solution containing the extracting agent on one side of the first ion exchange membrane, on one side of the second ion exchange membrane and between the first and second ion exchange membranes; and performing back extraction until a certain concentration of the back extraction solution is reached, and separating lithium, rubidium or caesium precipitates to obtain the final product. The invention provides a high-efficiency, low-cost and feasible route for industrial production of alkali metal salts.

The invention discloses a method for extracting lithium from salt lake brine by an adsorption method. The method comprises the following steps of: (1) making the salt lake brine pass through aluminum salt-containing adsorption resin at a speed of between 5 and 10 BV/H at the temperature of between 20 and 100 DEG C to ensure that the lithium ions in the salt lake brine are adsorbed on the adsorption resin; (2) making lithium ion eluant pass through the aluminum salt-containing adsorption resin at a speed of between 5 and 10 BV/H at the temperature of between 20 and 100 DEG C to ensure that thelithium ions adsorbed on the aluminum salt-containing adsorption resin are eluted and desorbed into the eluant solution so as to obtain desorption liquid; and (3) making the desorption liquid pass through common sodium cation exchange resin at a speed of between 5 and 10 BV/H to remove magnesium from the desorption liquid, and then concentrating to obtain a lithium salt. The method has the advantages of low consumption of chemical materials, simple process, easy operation and no pollution.

The invention provides a method for preparing industrial lithium carbonate by using salt lake brine with a high magnesium-to-lithium ratio. In the method, a TBP-CON-KS+FeCl3 is used as an extraction system to extract and back-extract impurity-free salt lake brine with a high magnesium-to-lithium ratio, the residual liquid obtained after back-extraction is converted by alkaline liquor for precipitation, the precipitate is washed to form an industrial lithium carbonate product and the lithium carbonate content is more than or equal to 99.0 percent and is in accordance with the requirements of GB/T 11 075-2003 standards. The method has the advantages that: liquid-liquid extraction with an organic solvent is adopted to realize the separation of lithium from magnesium, the lithium carbonate is precipitated by inorganic slats, the lithium carbonate is extracted from the salt lake brine with a high magnesium-to-lithium ratio, the process is simple, the control is easy, the operational reliability is high and the application range is wide; a process of calcination and diluted lithium solution evaporation and concentration is saved, the energy consumption is only 30 to 50 percent of that of the conventional process for producing lithium carbonate by using lithium-containing brine; initial raw material consumption comparison show that the production cost of the method is only about 8 percent of that of the prior art; and the raw material brine can return to a storage pool after the extraction of the lithium carbonate, so no by production disposal problem is involved, environmental pollution is relatively low and lithium yield in the whole process is more than or equal to 70 percent.

The invention discloses a method for extracting ultrahigh-purity lithium carbonate from chloride brine with a high magnesium-lithium ratio. The method comprises the following steps of: preparing a lithium chloride concentrated solution by an adsorption, desorption and evaporation concentration process; purifying, and precipitating lithium carbonate by using ammonium bicarbonate pulp; and converting into a lithium bicarbonate solution, filtering, and decarburizing. By improving steps and parameters of the conventional process, the purity of a product is more than 99.99 weight percent and the total amount of major impurities is not more than 0.002 weight percent without the introduction of additional high-cost purification steps such as ion exchange resin/membranes; and additional sodium ions are not introduced in the production process, byproducts at all stages can be recycled, and only an extremely small amount of waste solution is generated.

The invention relates to a clean production process of plateau sulfate type boron-lithium salt lake brine. The process comprises the following steps of: (1) arranging a pre-airing pond, a mirabilite pond, a NaCl pond, a carnallite pond, an epsom salt pond I, a magnesium removing pond, an epsom salt pond II, a boron pond, a lithium pond and an old brine pond; (2) controlling the sodium ion concentration in plateau sulfate type boron-lithium salt lake brine, precipitating mirabilite out in winter to obtain brine A, naturally evaporating the brine A, and salting out to obtain brine B; (3) naturally evaporating the brine B, and precipitating sylvine and carnallite out in sequence to obtain brine C; (4) naturally evaporating the brine C, precipitating an epsom salt out, and performing solid-liquid separation to obtain brine D and a solid A; (5) blending the brine D with mirabilite, removing magnesium to obtain brine E, and naturally evaporating brine E to obtain brine F and a solid B; (6) performing a hydration reaction on brine F, naturally evaporating, and precipitating reservoir water/inderite and brine G out; and (7) evaporating brine G or refrigerating for precipitating lithium sulfate, and processing the lithium sulfate into a corresponding product. The process has the advantages of comprehensive utilization of natural energy, saving in energy and environment friendliness.

The invention relates to a method for efficiently extracting lithium from salt lake brine. The method comprises the following steps: (1) forming an extraction organic phase by an extraction agent, a co-extraction agent and a diluent, and then mixing the extraction organic phase with salt lake brine according to the volume ratio of (3-4):2 for three-stage extraction with single extraction time being 2-10 minutes to obtain an organic phase; and (2) mixing the organic phase obtained in step (1) with a reverse extraction acid solution (0-1 mol/L) for three-stage reverse extraction with single reverse extraction time being 2-10 minutes, and collecting an aqueous phase which is an aqueous solution containing lithium ions. The co-extraction agent of an extraction system of the method is hydrophobic ionic liquid, compared with conventional synergist ferric trichloride, the interference caused by iron ions is avoided, the reverse extraction acidity is greatly reduced, more importantly the lithium-magnesium separation factor is significantly improved, and the elution step of magnesium ions is reduced; in addition, the method provided by the invention is easy in process, easy to control, high in operation reliability, and good in recyclability of the organic phase, and greatly reduces the production cost for extracting the lithium from the salt lake brine.

The invention discloses a method for extracting lithium carbonate from salt lake brine with high magnesium/lithium ratio, belonging to the technical filed of inorganic salt extraction. The method comprises the following steps of: carrying out extraction, washing and stripping steps to obtain a stripping solution composed of NaCl and LiCl or NH4Cl and LiCl, then introducing CO2 or adding Na2CO3, and controlling the pH value and dynamic conditions to obtain a nanoscale or microscale Li2CO3 product. The method disclosed by the invention has the advantages of simple steps, low equipment requirement and wide sources of raw materials, and is suitable for industrial production.

The invention provides a method for extracting lithium from salt lake brine, comprising the following steps: 1) mixing organic phase composed of salt lake brine, extracting agent and extracting medium with synergist, extracting the mixture and collecting the organic phase; 2) mixing the organic phase in step 1 with hydrochloric acid solution and carrying out back-extraction on the mixture, collecting aqueous phase to obtain aqueous solution of Lithium-ion; the step is characterized in that the extracting medium is hydrophobic ionic liquid. Compared with the traditional method for extracting lithium from salt lake brine with solvent gasoline as the medium, the method of the invention employs green and environmental-friendly ionic liquid as the medium; as a result, lithium salt extraction efficiency is improved, back-extraction acidity is lowered, what is more important is that environmental pollution and equipment corrosion due to use of a great deal of volatile organic solvent and high-concentration hydrochloric acid are avoided. In addition, the organic phase of the invention features fine cyclic applicability, thus greatly reducing production cost for extracting lithium from the salt lake brine.

The present invention is manganese dioxide process of extracting lithium from salt lake brine, and the process is suitable for producing lithium carbonate and lithium chloride with lithium-containing Qinghai saline lake brine, including concentrated lithium-containing Qinghai saline lake brine. The process includes sun shining saline lake brine to obtain concentrated lithium containing brine, selective adsorption of lithium ion with MnO2 adsorbent, eluting adsorbed lithium ion with hydrochloric acid solution, and refining and concentrating the elutriant to obtain material for preparing lithium carbonate and lithium chloride.

The invention relates to a coordinate extracting system for extracting lithium from salt lake brine with extraction method, which comprises the following steps of (1) acidity of raw material liquid adjustment: adding hydrochloric acid to the salt lake brine to adjust the pH value of the raw material liquid to 1 to 5 so that the raw material liquid is obtained; (2) extracting lithium: carrying out three-stage extraction on the raw material liquid obtained in step (1) by using TBP-BA-FeCl3 solvent naphtha as an extracting agent to obtain an organic phase; (3) organic phase washing: carrying out three-stage washing to the organic phase obtained in the step (2) by using the hydrochloric acid as a washing agent; (4) organic phase reextraction: carrying out three-stage extraction on the organic phase obtained in the step (3) by using hydrochloric acid as a reextraction agent to obtain lithium chloride solution. The invention has the advantages of simple technique, easy control, low reextraction acidity, low requirements on reextraction equipment materials and concentration of lithium in the material brine, and no need of evaporation concentration of thin lithium solution, thereby saving energy, reducing consumption, decreasing the production cost, and simultaneously improving the total recovery rate of the lithium effectively.

The invention discloses a method for refining lithium from salt lake brine with a high magnesium-lithium ratio. The method comprises the following steps: 1) removing sulfate radicals from brine from which sodium and potassium are extracted, evaporating the brine to obtain lithium-rich and boron-rich brine; 2) extracting boron from the lithium-rich and boron-rich brine to obtain boric acid and lithium-rich brine; 3) separating the lithium-rich brine by using a nanofiltration membrane to obtain primary concentrated water and primary produced water; 4) through reverse osmosis, separating the primary produced water to obtain secondary produced water and fresh water; 5) removing magnesium from the secondary produced water, and evaporating the secondary produced water to obtain refined lithium-rich brine. The method is simple in technological process; by the method, the energy consumption is greatly reduced, salt lake brine resources are fully used, and the recycling rate of the lithium ions is greatly improved; influence of the boron on lithium carbonate or other lithium salt products is avoided, thus the quality and the competitiveness of products are greatly improved.

The invention discloses a lithium-titanium oxide type lithium ion sieve absorbent and a method for preparing a precursor thereof, and relates to a method for preparing an inorganic absorbent for absorbing enriched lithium from salt lake brine, seawater and other liquid lithium resources. The method is characterized in that: titanium dioxide and lithium salt are taken as raw materials, ground by a ball grinder and dried so as to prepare a precursor Li2TiO3 of an ion sieve through a high-temperature solid-phase roasting method; and the lithium is eluted from the precursor Li2TiO3 by inorganic acid to prepare an ion sieve H2TiO3. The method has the advantage of simple technology, and the obtained ion sieve has the advantages of low solution loss and high adsorption capacity.

The invention provides a method for preparing battery-level lithium carbonate by using salt lake brine. The method uses salt lake brine in Qinghai as a raw material and uses an ion selectivity separation device to transfer magnesium and lithium ions in the raw material of the brine under the effect of an electric field; when the raw material of the brine passes through a separation membrane with selectivity, monovalent ions, such as the lithium ions and sodium ions can pass through, but divalent ions, such as magnesium ions and calcium ions can be separated, so that lithium-enrichment brine with a low ratio of magnesium to lithium is obtained after the separation; impurities, such as Ca<2+>, K<+>, SO4<2-> and Mg<2+>, in the lithium-enrichment brine with the low ratio of the magnesium to the lithium can be deeply removed; an auxiliary material of a pure alkali solution can be purified; the lithium-enrichment brine after deep removal of the impurities is subjected to three-effect evaporation and concentration after neutralizing with acid; alkali is added into the concentrated lithium-enrichment brine at a certain temperature for lithium sedimentation; and finally, the finished product of the battery-level lithium carbonate can be obtained by drying and cooling after filter press, washing and centrifugal separation washing are carried out. The battery-level lithium carbonate meets the requirements of the local standard DB63/T1113-2012 (brine battery lithium carbonate) in the Qinghai Province.

The invention relates to a method for preparing high-purity lithium carbonate and other available byproducts from salt lake brine. The method comprises the following steps: (1) separating potassium and sodium by exposing salt in a salt field, (2) separating boron by an acidification method, (3) separating magnesium by a sedimentation method, (4) separating calcium by the sedimentation method, (5) preparing lithium chloride, and (6) preparing the lithium carbonate. The preparation method of the invention can purify the potassium, sodium, boron, magnesium and calcium ions respectively besides obtaining the lithium carbonate product of which the purity is over 99.5 percent so as to fully utilize the salt lake brine resource.

The invention discloses a method for extracting lithium from salt lake brine by using an adsorption method. The method comprises the following steps of adding an absorbent in the brine; absorbing the lithium ions in the brine to the absorbent; then treating by using a ceramic membrane; retaining the absorbent in a concentrated solution; subjecting the concentrated solution to plate-frame pressure filtration to obtain an absorbent filter cake; removing most of impurities and water from the brine; washing the filter cake with water and desorbing with an eluent to obtain a desorption solution; removing magnesium from the desorption solution by passing the desorption solution through a weak acid type cation exchange resin; concentrating with a reverse osmosis membrane to obtain a refined lithium solution for preparing lithium carbonate. The method is simple in process and can be operated easily. The absorbent has high utilization efficiency; a lithium-extracting process is short; and the content of the prepared lithium solution is high.

The invention provides a system from extracting lithium from salt lake brine, comprising ionic liquid, a co-extracting agent and a diluent; the ionic liquid is pyrrole hexafluorophosphate ionic liquid comprising lithium extraction functional groups, and the diluent is from solvent gasoline, sulfonated kerosene and petroleum ether. The use of the co-extracting agent iron trichloride is avoided in the lithium extraction system, adjusting pH of brine is not required, at least 5 tons of industrial hydrochloric acid and 2 tons of sodium hydroxide may be saved per ton of lithium chloride produced, and the production cost is greatly reduced; saponifying step, pickling step and deironing step are omitted from the technique, and therefore, the system is easier to use in industrial large-scale production.

The invention discloses an ionic liquid modified positively charged composite nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: on a supporting bottom film, firstly, carrying out interfacial polymerization on polyamine and polyacyl chloride to form a primary polyamide layer, and then carrying out an amidation reaction on acyl chloride groups remaining on the surface of the primary polyamide layer and amino functionalized ionic liquid to prepare the composite film. The preparation method comprises the following steps: (1) preparing apolyamine aqueous phase solution and a polyacyl chloride organic phase solution; (2) carrying out interfacial polymerization on the surface of the bottom film to prepare a primary polyamide nanofiltration membrane; and (3) reacting the amino-functionalized ionic liquid solution with acyl chloride groups on the surface of the primary polyamide layer, and carrying out heat treatment to obtain the positively charged composite nanofiltration membrane. By changing the charge property of the composite membrane, lithium resources in the salt lake brine with a high magnesium-lithium ratio can be effectively extracted, the magnesium-lithium separation factor of the composite membrane is lower than 0.15, and the flux is 40-50L/m<2>h. The method has the advantages that the preparation method is simple, and the method has a good industrial application prospect in the aspect of salt lake lithium extraction.

The invention belongs to the technical field of a functional material, and discloses a method for preparing a composite adsorption material used for absorbing rubidium and cesium ions. The method is characterized in that a polymer layer containing an o-dihydroxybenzene structure is prepared through in-situ polymerization on the surface of a porous material, then am ion exchange function nano adsorbent layer is subjected to in-situ growth on the surface of the polymer layer, and the composite adsorption material can be obtained. The polymer layer on the surface of the porous material has strong rubidium caesium complexation and adsorption functions, has strong adhesion effect on a porous material and the ion exchange function adsorbent, greatly increase the stability of the composite adsorption material, is in favor of in-situ growth of the adsorbent, and can adjust and control the granularity of the adsorbent layer; during adsorption, a solution and the adsorbent are fully contacted, and are connected with the polymer layer through particle gaps of the adsorbent, synergism is used for absorbing rubdium and cesium, the adsorption capacity is high, and the composite adsorption material can be used for absorbing rubidium and caesium in salt lake brine and absorbing caesium in radioactivity waste water.

The invention discloses a continuous ion exchange device for extracting lithium from salt lake brine, comprising resin, a plurality of resin columns used for loading the resin, a feeding main pipe which is communicated with the upper end of each resin column and a discharge main pipe which is communicated with the lower end of each resin column, wherein the resin columns are sequentially connected in series by a serial pipeline to form an adsorption resin column group, a rapid leaching resin column group and a leaching resin column group which are in sequential mobile circulation running, andeach feeding branch pipe and each discharge branch pipe are respectively provided with a control valve used for harmoniously controlling the transformation process of realizing ion exchange, washing,leaching and resin in turn among the resin column groups. Compared with the traditional fixed bed adsorption technology, the invention has the advantages of simple equipment, convenient operation, high automation degree, small usage amount of resin, high utilization ratio, stable product concentration and high concentration of qualified liquid.

The invention provides a method for extracting lithium from salt lake brine. The method comprises the following steps: 1) preparing extract organic phases which comprise a composite extracting agent and a diluent, wherein the composite extracting agent is prepared by mixing tributyl phosphate with N,N-bis(2-ethylhexyl)-3-butanone acetamide according to a volume percent ratio of 50% to 50%; the diluent is sulfonated kerosene; 2) preparing an extract water phase which is an LiCl-MgCl2-H2O system; 3) adding HCl and FeCl3.6H2O to the extract water phase, wherein the ratio of amount of substances of iron and lithium is controlled to be 1.3 to 1, the acid concentration is 0.5mol/L, and the lithium concentration is 1-3g/L; 4) standing after fully mixing the extract water phase obtained in the step 3) with the extract organic phases obtained in the step 1) in a volume ratio of 1 to 2, and then separating a liquid phase. By adopting the method, the problems that the corrosivity of high-concentration tributyl phosphate towards extraction equipment is stronger and the dissolution loss of the extracting agent in water is serious in long-term operation are solved, and the lithium extraction efficiency of the prior art is achieved. The extraction method is simple and reliable to operate.

The invention discloses a preparation method of manganese oxide ion sieve adsorbent and a precursor of the manganese oxide ion sieve adsorbent. The method comprises the specific steps that lithium hydroxide solutions are firstly added into manganous salt solutions for a co-precipitation reaction, generated gelatinous precipitate is dried and calcinated, obtained powder is soaked in acid for lithium removal, solutions with lithium are added for a hydrothermal reaction, cooling, filtering, washing and drying are carried out, and the ion sieve precursor Li<4>Mn<5>O<12> is obtained; the precursor is soaked in the acid for lithium removal again, and the ion sieve adsorbent MnO<2>.0.31H<2>O is obtained. The synthetic lithium ion sieve precursor material Li<4>Mn<5>O<12> has a spinel structure, the synthetic ion sieve MnO<2>.0.31H<2>O can be used for extracting lithium of salt lake brine, seawater and other lithium solutions, and the advantages of being large in adsorption capacity, high in selectivity and good in circulating performance are achieved.

The invention relates to a granular lithium ion sieve, which is used for extracting lithium from (metal) lithium-containing solution such as salt lake brine, seawater, well brine or geothermal water and the like. The granular lithium ion sieve is prepared by cladding lithium ion sieve powder into a polymer in the process of forming a cross-linked polymer through the reversed phase suspension polymerization of an acrylate monomer. The granular lithium ion sieve has the advantages of high mechanical strength, high selectivity, high adsorbance, high adsorption rate (the adsorbance is 2 mmol*g<-1> in one hour) and high stability. The foundation is provided for extracting the lithium from the salt lake brine by an ion sieve adsorption method.