CN1199710A - Process for recovery of lithium and other metals and salts from brines in helminthoid evaporating system using solar energy - Google Patents

Abstract

A process and apparatus for continuously removing soluble minor constituents from brines containing soluble major and minor constituents by use of a Helminthoid evaporator.

Description

The lithium in the recovery bittern and the method for other metal and salt

The present invention relates to from brine system, reclaim a kind of method of lithium and other time component.

Valuable element and the salt found at occurring in nature are dissolved in the bittern as ion.The method that reclaims the inferior component in this class bittern reclaims next component normally by this bittern of evaporation.Concentrated major constituent both can also can use the physical sedimentation method by in the chemical precipitation method described in No. 4271131 patents of United States Patent (USP), major constituent in the bittern is separated from the throw out that is rich in inferior component and is carried out.

We know, the fractional crystallization that constantly is precipitated out of the salt of low solubility continuously in the successive pond, with recovery the component of commercial value is arranged, as piece salt (halite NaCl), potash fertilizer (sylvite KCl), bittern is mostly from ocean, salt lake or subsurface brine.For example: the muriate bittern of the northwest China Caidamu Basin or the Dead Sea mainly contains sodium, potassium and magnesium ion.Utilize the Evaporation fractionation of the sun to be settled out salt, carnallitite, bischofite.The oldest business method that reclaims lithium is mining, as the lithium of finding in pegmatite, reclaims lithium then from this rock, because cost of technology costliness, no longer manage in most mines.

Adopting the Evaporation of bittern and chemical fractionation to come enriching lithium in California and Chile is the modern processing method that reclaims lithium from bittern, in smelting factory the lithium of enrichment is processed then, produce a kind of pure lithium compound, as: lithium chloride or Quilonum Retard.

It is because of leading ion such as Mg in the bittern that California and Chile use the method for chemical fractional crystallization always ²⁺, K ⁺And Na ⁺Content not high, the bittern Chemical Composition of the tired paddy of California gram is as follows:

Ca Mg Na K Li Cl SO ₄ HCO ₃mg/L?420 190 6500 400 23 11000?460 930

The subsurface brine that tired paddy of gram is used for carrying lithium is pumped to evaporation tank, CaCO ₃And CaCO ₄Almost all be deposited in Di Chizhong, and NaCl, KCl and MgCl ₂By also partly precipitating with reagent generation chemical reaction.Remaining fluid is the liquid of rich lithium, and its content is greatly to enough separating from throw out in gathering the pond.Final product after tired paddy processing of gram is pure Li ₂CO ₃

Resemble the such arid area in the Chinese Caidamu Basin or the Dead Sea, bittern mainly is muriate bittern.After fractional crystallization collection sylvite, useless halogen almost is a kind of pure magnesium chloride solution, contains lithium, boron, bromine, iodine and other time component of minor amount.Time component concentration is so low in the bittern, so that can not be with it from major constituent-MgCl with single fractionation step ₂In separate.Mg/Li is low by 1000: 1 in the bittern of the Caidamu Basin or the Dead Sea, in order to reclaim the trace elements as the lithium economically from this bittern, requires this ion must reach a sufficiently high concentration.In order to obtain such concentration, almost want the whole bittern of evaporate to dryness.It is still too low that remaining fluid contains the lithium amount, can not pass through a simply progressively Evaporation, and it is come out from salt body precipitate and separate.Thereby inferior component is contained in the crystalline matrix of other salt usually or as the impurity of this salt.Before this, remove magnesium in the bittern by resembling CaO generation chemical reaction, thereby obtain lithium with other salt, the cost height if the amount of demagging is too big, then this method is uneconomical.Owing in fact can not reclaim inferior component resemble the lithium, and it is uneconomical to reclaim main tramp element magnesium, like this in place, Caidamu Basin and so on, the residual halogen of carrying behind the potassium is abandoned as the halogen that gives up usually.The residual halogen of the Dead Sea is used for carrying magnesium and bromine, rather than lithium.

Theoretically, resemble so micro-salts such as lithium, bromine, iodine, boron, after main salt precipitation, when their content also surpasses its equilibrium value, finally also will precipitate.At a kind of MgCl that contains ₂, NaCl and KCl bittern in, the ion content ratio of these components resembles lithium, bromine, iodine, boron time components contents will exceed 1,100 times.When this bittern of evaporation, main ingredient will at first be precipitated out as one or more salt.May be attracted in the muriate crystal as a sosoloid from bromine in the muriate bittern and iodine.Yet, some time component, as: lithium, will remain in the solution, enough high up to its concentration, could be precipitated out as LiCl.Experiment shows that in chloride soln, the ratio of main ion magnesium and lithium is bordering on 1, and lithium could precipitate.So lithium will be contained in the solution, have only when it is highly enriched, could from solution, be precipitated out.

Up to now, can't from resemble the such bittern in the Dead Sea and the Caidamu Basin, carry lithium, because leading ion, particularly MgCl in these bittern with existing method ₂Too high levels.For example, can carry lithium to restraining a tired paddy bittern with existing method, the typical bittern composition contrast in its bittern composition and Cha Er sweat lake, the Caidamu Basin is as follows, represents with every liter of milligram.

Ca Mg Na K Li Cl SO ₄HCO ₃Tired little 57,890 29,050 14,910 13 228590 slight Qaidams, paddy 420 190 6,500 400 23 11,000 460 930 Qaidams (former halogen) of gram (producing the carnallitite little 122,010 1,220 293 133 359470 residual halogen after slight)

Main salt precipitation will make time component enrichment of some solubilities.When a kind of its water content of saturated bittern that contains leading ion magnesium is evaporated a half, because the supersaturation effect causes the main ion precipitation of half.Subsequently, the content of main ion roughly remains on identical saturation value.Simultaneously, although lost moisture content, the inferior component of a kind of solubility resemble the lithium still keeps undersaturated condition, so double in the remaining strength of solution of subordinate phase.This moment, this bittern still had enough big solidliquid mixture amount, by the physical sepn effect, this bittern can be discharged from sedimentary salt, just was discharged to or pumped in another evaporation tank, steamed half of its water yield again.The content of main ion still keeps its above-mentioned roughly the same saturation value.In the phase III of Evaporation, the inferior component concentration of this solubility improves 4 times.If this fractional distillation effect repeats 10 times by 2 times, the inferior component concentrations that resembles the such solubility of lithium can increase by 2 ¹⁰Or 1024 times.If repeat 5 times by 3 times, its concentration can increase by 3 ⁵Or 243 times.At that time, in the original place reaction tank described in the No.08/403364 patent application of application on March 14 nineteen ninety-five or in refinery, can be by the enriched material of this component of chemical action by refining or purifying.

From bittern, reclaim the LiCl enriched material with existing business method, sedimentary MgCl in the bittern of the Caidamu Basin ₂Amount than the high 30-60 of the amount in the bittern of California doubly.So it is so little that the raffinate that is rich in lithium of Qaidam bittern is compared with the throw out amount, cause this richness lithium bittern to be difficult for from the salt throw out, separating.If evaporate to dryness bittern, then lithium becomes a kind of impurity and is contained in MgCl ₂In, content is about 0.1% or less than 0.1%, it is uneconomic carrying lithium from the mixture of low levels like this, therefore is all can not be used for carrying lithium with the residual halogen behind Qaidam lake bittern water or its product potassium.The residual halogen that produce behind the potassium Dead Sea is used to carry magnesium and bromine at present, rather than lithium.

The dense bittern of 1 liter of LiCl of system system, its Mg/Li are 10 or less than 10, contain the lithium of 10 gram Qaidam bittern, the MgCl that then is precipitated out from bittern ₂Amount will greater than 15000 the gram.If take one step that magnesium is precipitated out from useless halogen, then the raffinate of rich lithium is compared with throw out will have a very little volume, and like this, the lithium that is rich in bittern will remain in MgCl ₂In the throw out hole or it adsorbed by crystalline material as a fluid inclusion.

So far, bittern passes through and Na ₂CO ₃Chemical reaction taking place or by stages bittern is carried out physical evaporation, remove the magnesium in the bittern, could reclaim lithium.If the demagging amount is too big, consider Na ₂CO ₃The cost of this reagent is uneconomic with the method for chemical reaction.Though as we in No. 08/503587 of former first to file application, narrated with the successive physical evaporation stage except that MgCl ₂Method be better than the method for prior art because with the separation method instead of chemical partition method of physics, but this method may be more expensive, because its requires to use evaporation stage repeatedly.

The method of describing in our common pending application provides design an evaporation system, in this system, resembles MgCl ₂Such major constituent was removed by the successive physical sepn stage.By disgorging in a series of evaporation tanks, in gathering the pond, the ratio of final bittern and throw out is greatly to enough making the bittern that is rich in time component be discharged from or pump and separated coming.

In our common pending application, we have designed three kinds of different ponds of arranging: (1) is initial, separates with a collection of pond, and the bittern that is rich in time component is gathered in last pond.(2) first pond is big pond, adopts little pond of a ratio then, and last minimum pond is to gather the concentraing pond that is rich in time component.(3) with the continuous pond of a series of same specifications, secondly components contents is more and more high, and it is the highest that the bittern that gather in last pond contains time component.

The object of the invention provides than enrichment and the more economical effective means of method that reclaims time component from bittern in the past.

Another object of the present invention is to improve the rate of evaporation of bittern under normal operation, so that provide more economical reasonable method for putting forward lithium and other micro-bittern component.

Have now found that, from the bittern of the Qaidam or the Dead Sea, can reclaim valuable lithium product cost-effectively.According to the present invention, it is mobile that the pond vaporizer of a big band internal partition can make bittern be round about manner in the pond, and purpose is to form a bittern constantly by the method for supply and collection.Contain the bittern supply at one end evaporation facility of the inferior component of lower concentration, can reclaim this time component economically at the other end that evaporates facility.

Fig. 1 is the flow graph that concentrates lithium like the present invention in the vermiform vaporizer at.

Various geometric modes can both be used for providing a continuously supply of the present invention and collection side Formula. One easily mode be to lay the such mode of dividing plate to produce circuitous effect, make to add to one Bittern in the individual groove can be extracted into to be in another groove in the other direction and flow, and as plowing, is illustrated in Among Fig. 1. So fresh bittern stream is being driven the bittern of evaporation in circuitous mode and is being flow through steaming Send out device. Because the bittern type of flow is curculionid shape fossil worm circuitous vestige in mud very, so this Brightly be known as one like the vermiform evaporimeter.

For economy is carried lithium, the evaporimeter trough is arranged in the mode of spiraling, this is that another is reasonable Measure, from this end supply fresh brine that spirals, its middle part enrichment inferior component halogen to be collected Water. Also can adopt other geometry, make bittern at one end enter continuously evaporimeter, Simultaneously, also constantly flow to the inferior component that the other end goes to reclaim desired enrichment.

Compare with other device, like the vermiform evaporimeter following advantage arranged:

(1) usage space to greatest extent.In area, the Dead Sea or California Mo Hafu (Mohave) desert, space problem is severe especially problem.At Mohave, the mountain range that the level land area of bittern water body one side is close to is limit, and the product that evaporation is produced has been limited on the face of land that can be used for Evaporation, installs like vermiform vaporizer and makes that the spendable evaporation area of bittern has obtained utilizing to greatest extent.

(2) transport bittern most effectively.In existing evaporation system, usually need a large amount of pumps or irrigation emitter unit with the pond output of bittern from this system.And for for the vermiform vaporizer, usually only with a pump supply bittern, only in some cases, need to draw rich lithium bittern with another pump at the other end.One like in the vermiform vaporizer, pump into fresh brine from an end of this vaporizer, because the water power potential energy makes bittern produce motion.Be arranged in the bittern that being rich in of the residual halogen discharge end of vaporizer be recovered the collection pond of time component and can be discharged to or pump into the device that further carries out chemical process.If it is motionless that bittern is detained in the collection pond for some reason, at this moment an available complementary pump.

(3) remove the major constituent throw out effectively.In big evaporation tank, have to remove throw out in the pond with the pontoon of a costliness.Can make like vermiform vaporizer internal partition that wide to be similar to the wide or several utensils of several people wide like that for one, so that remove the major constituent throw out easily.Usually, when salt throw out amount in the circuitous groove reach groove depth 1/3 or 1/2 the time or when throw out has stoped that bittern is mobile in the groove, remove throw out.

(4) control the Evaporation process effectively.Like in the vermiform vaporizer, the inferior component concentrations resemble the lithium depends on: (a) flow velocity of the fresh brine of a specific concentrations.(b) major constituent (resembles MgCl ₂6H ₂O) such aqueous deposit is through the loss speed of water after Evaporation or the precipitating action, (c) from gathering the pond or like the speed of inferior component bittern of having removed enrichment last pond of vermiform vaporizer.Though can not accurately control the rate-of-loss of coolant that causes by factors such as weather condition, brine temperatures, can measure to its every day.In gathering groove in the bittern time component concentration reached regulation take concentration the time, bittern is discharged from the discharge end of groove in the groove, thereby has controlled the bittern rate of discharge that is rich in time component.So the dehydration volume that weighs up bittern the day before yesterday according to day stream (halogen) water rate at an easy rate adds the volume of adopting the halogen amount.

The separation pond of being narrated in the patent application of the No.08/403364 of former first to file supplies the halogen system continuously, need to measure the rate of influx and the discharge rate that flow in next pond of each pond from previous pond bittern, if adopt 100 pond series, then need carry out 100 times more than calculating, so that control is by the bittern migration of this pond system effectively, such calculating is loaded down with trivial details, and is very difficult to control such evaporation system.

(5) minimum laid down cost: the evaporation body of building a leakproof is tied to form the size of the periphery that originally depends on the pond and size etc.Each evaporation tank in evaporation tank series has its wall, but the public common dividing plate of two adjacent pool like the vermiform vaporizer.The necessary leakproof of pool wall in addition is in case the bittern of rich lithium is lost in the underground water.Groove space bar like the vermiform vaporizer is not necessarily wanted complete leakproof, because rich lithium bittern only drains in another contiguous groove from a groove.But the bottom land of a leakproof need be provided, prevent that lithium from infiltrating in the underground water on every side.

Though, being designed to be used in the sun power concentrated brine like the vermiform vaporizer, same principle can be used for making following two kinds of addition type evaporation system:

(A) use sun power to evaporate the seemingly vermiform vaporizer of bittern under heating up, wherein bittern uses the heat energy from heating system at first to heat.

(B) only use by combustion fuel or from the heat energy of other non-solar energy like the vermiform vaporizer.

Under the condition of arid area,, do not need this class heating system if enough ground surfaces are arranged as the Caidamu Basin.Then must use the accelerated evaporation system when obtainable area is restricted, heating system can be used to replenish the sun power as the required heat of evaporation.

When fuel is cheap, can be according to like system of vermiform vaporizer principle design, it not only can also can reclaim valuable component such as lithium from common seawater from bittern.

Have now found that the bittern evaporation rate is far below fresh water.Pointed in the No.08/403364 patent application of former first to file, at the year of Qaidam area fresh water about 3000 millimeters/year of pure steam output.Now also find,, contain saturated MgCl in the area, Qaidam ₂Bittern year only about 650 millimeters of pure steam output, in annual 9 warmer months, every day, pure steam output was about 2 millimeters.Fortunately as bischofite (MgCl ₂6H ₂O) aqueous like this MgCl ₂The throw out of major constituent mineral has also been removed the moisture content of bittern, and its rate of dewatering is approximately owing to constantly be evaporated to the twice of percentage of water loss in the air.The evaporation of bittern causes about 2 millimeters of water loss every day.At bischofite MgCl in addition ₂In will make in the groove bittern face 3-4 millimeter that descended again as the hydrate water of crystal water.So the dark interior bittern volume of groove of 30cm will be reduced to 1/50 of original volume, if the bittern in this vaporizer is heated to 60 ℃, then rate of evaporation can increase greatly.

Resemble MgCl when having gathered ₂6H ₂In the time of the such major constituent of O, owing to the minimizing of solubleness along with temperature reduces, so in the winter months of cold, remove the halogen rate and compare At All Other Times in this year even want big.This shows and resembles the Qaidam like this in cold dried area in winter, can both concentrate bittern in 1 year 12 months.

Be an example of explanation embodiment of the present invention below, promptly collect the example of LiCl: an energy day seasoning 100m from the bittern of the useless bittern discharging of magnesium chloride ³The saturated MgCl that is rich in dissolved LiCl ₂The vermiform vaporizer of bittern ability, this bittern amount can be supplied a bittern daily demand amout of producing 1 ton of solid LiCl factory, and Details as Follows:

(1) about 100m ³Contain about 1%LiCl, for the bittern amount of producing 1 ton of solid LiCl.

(2) the bittern amount from seemingly last trough collection of vermiform vaporizer is about 100m ³, each flute length 100m, wide 3m, dark 0.33m, volume 100m ³

(3) desire is produced 100m ³The volume that the collection bittern that contains 1%LiCl need contain the bittern of 100ppm LiCl (area, Qaidam is called old halogen) should be 10000m ³

(4) supply is about 10000m like old halogen volume in the vermiform vaporizer ³

(5) have now found that, in warm month, enter sedimentary old halogen bittern about 5mm of average daily loss rate of air or enhydrite or 0.005m, cause the about 0.005m of bittern face decline every day in the groove.So, lose 1000m ³Bittern, the surface-area of its exposure must be 2000000m ²Or 2km ²

In building enrichment bittern lithium like the vermiform vaporizer time, the bittern that leaks in the underground water on every side is reduced to a minimum.Prevent to be leaked with two kinds of ways: (a) make in the vaporizer of construction bittern face and this area's groundwater level on sustained height.(b) build the vaporizer of a leakproof.Preferably select the latter, but build a 2km ²The cost of leakproof vaporizer is not cheap.

As mentioned above, for gathering 100 times of lithium enrichments in the bittern, must supply with vaporizer 100m every day ³100 times be 10000m ³Old halogen.Evaporation divides two stages to carry out, and 10 times of fs concentrate and require old halogen from 10000m ³Drop to 1000m ³, subordinate phase concentrates for 10 times only needs bittern from 1000m ³Reduce to 100m ³A vaporizer can be divided into two sections to be built, and first section is applicable to first 10 times of enrichments of bittern, and second section is second 10 times of enrichment.Before the initial stage of Evaporation bittern concentrated in large quantities, the little leakage in pond was unlikely and causes serious economy loss.For the enrichment of first 10 times of lithiums, to build to such an extent that make bittern reach minimum leakage to ooze like the circuitous groove in first section in the vermiform vaporizer, but can not get rid of seepage fully.The trough that is used for second 10 times of lithium enrichment, substantially leakproof; Its seepage must be very small.

(a) be 1800000m like first section whole surface-area of vermiform vaporizer ³, the degree of depth＞0.33m.In first section in vaporizer, can hold the about 600000m of bittern cumulative volume ³, this section is separated into 180 troughs by dividing plate, each flute length 100m, and wide 10m is so each groove can hold bittern 3300m ³, these troughs are adjacent one another are, arrange as shown in Figure 1, flow in the next groove from a trough continuously so that bittern can be circuitous mode.

Can build the bittern lakeside in like first section of vermiform vaporizer, the refuse chlorination magnesium salts that is used for carrying behind the potassium in the nonirrigated farmland district removes shop fixtures as the cement material, retaining wall and make dividing plate.Each groove will be repaiied enough deeply, and about 33cm from the end to the surface is so that can hold bittern.Because evaporation causes the bittern loss, thus bittern will often be replenished, so that the bittern face always keeps same height with this area's ground water table.Certainly, the water power potential energy difference between bittern face and the peripheral ground water table can be ignored in the groove.Leak into the bittern in the underground water or the bittern that swells can be ignored down from underground water normal, the end of particularly supposing this pond is watered with retaining wall to be consolidated under the situation that reduces seepage.If feasible, vaporizer also can be with a kind of water-repellent substance of black, in polyvinyl chloride (PVC) or black canvas benefit, to increase rate of evaporation.Although not require not do like this, preferably these troughs have a rectangular profile, so that this system easy to operate and be convenient to reclaim product.

Bittern from the waste treatment pond is a kind of magnesium chloride solution that contains about 150ppm LiCl.Bittern is a kind of round about manner 180 troughs like the vermiform vaporizer of constantly flowing through that continue.Bischofite precipitates, and the lithium that is enriched in the bittern flows forward.The volume decision of the bittern that the flow velocity of bittern every day pumps by Evaporation bittern daily loss amount with from last groove.Because the precipitating action of Evaporation and enhydrite, the volume of bittern daily loss is 0.005m * 1800000m ²Or 9000m ³Pump and import second section bittern volume vaporizer in last groove every day is 1000m ³So the fresh brine day of supply of supplying with first trough of vaporizer front is 10000m ³, during 10 hours, with 1000m ³/ hour speed pump into bittern.Can put the flow velocity that a dyeing marker removes the bittern that spike flows to.To flow into 10000m every day ³Flow velocity bittern, primary 10000m ³Bittern flow into 600000m ³Vaporizer after, through bimestrial migration, arrive and gather in the groove, original bittern VOLUME LOSS 9/10ths, in vaporizer, precipitated 8000 tons MgCl ₂6H ₂O, 1000m ³Bittern when from last groove, pumping, bittern lithium content＞0.1% that enrichment is 10 times contains LiCl more than one ton.For enriching lithium further, this bittern all is pumped to second section of vaporizer.

Constantly for halogen and adopt the method for halogen will be with about 2 months of the seasoning at least in vaporizer of this bittern, in the end just can reach the concentration of regulation in groove.When running into the rough weather Evaporation when insufficient, the halogen of delaying to adopt possibly in the end reaches the concentration of regulation in groove once more up to lithium content.If economically feasible words will be installed a heating systems, when weather condition are unfavorable, so that form normal rate of evaporation.

Observed already in the area resemble the Caidamu Basin, in the time of April to October, the halogen temperature reaches 40 ℃ more than, thereby can carry out Evaporation effectively.In late October, temperature descends in air, adopts the halogen rate and lowers.But in December or January, it is very effective that this method becomes once more, and that is because aqueous MgCl ₂6H ₂O precipitates, and makes bittern lose in the same old way.

(b) making the seemingly vermiform vaporizer second segment table area of lithium enrichment once again is 200000m ²This section brine depth also is 0.33m.The about 66000m of cumulative volume ³This section is divided into 66 troughs with compartment, each flute length 500m, and wide 6m, every groove is contained the about 1000m of bittern ³Dividing plate is laid as shown in Figure 1, and it makes bittern be circuitous mobile, passes through vaporizer continuously.

Compare with first section vaporizer, second section is solid with watering when the magnesium cement of real estate, and with black plastic plate lining with antiseep.This vaporizer can be built on the local ground water table, avoids seepage.Be the magnesium chloride bittern of a kind of containing＞0.1% dissolved LiCl solution in first section stern notch, every day this bittern pumped into the first groove of second section in vaporizer.Bittern also is 66 troughs that circuitous flow pattern is passed through second section.When rich lithium bittern flowed forward, bischofite also precipitated thereupon.Causing bittern daily loss amount owing to the precipitation of Evaporation and aquo compound is 0.005m * 200000m ²Or 1000m ³From stern notch, pump, be used in an original place reactor or be 100m at the bittern volume that a factory processes at last ³/ day.The whole day replacement amount of bittern that is used for second section first groove of supply from first section stern notch is 1000m ³

Can introduce a kind of marker that dyes goes spike to flow into the flow velocity of bittern.If with 1000m every day ³Speed flow original 1000m ³Bittern stream flow into 66000m ³Vaporizer, after through 66 days, arrive to gather groove, originally the bittern VOLUME LOSS 9/10 and reached balance.In vaporizer, the MgCl that from bittern, is settled out ₂6H ₂O is about 800 tons, and the content of lithium has improved 10 times again.Now, the 100m that from stern notch, pumps ³The LiC that concentration is 1% in the bittern, amount is about 1 ton can process in an original place reactor or in a factory.

Continuously for halogen and the characteristics of adopting halogen, bittern is being four wheat harvesting periods like the ripe cycle in the vermiform vaporizer in conjunction with first and second evaporator stages.After the bittern maturation, LiCl after concentration has reached design requirements in bittern just, and also the there evaporation conditions is also normal, is 1000m from the volume in the first section first groove of old halogen input vaporizer that contains LiCl100-150pm in the waste treatment pond ³/ day.Once fill with bittern in this system, and operation fully, can gather from second section stern notch then that to contain 1% LiCl bittern volume be 100m ³When the Evaporation of rough weather condition is insufficient, then may need: a) delay to adopt halogen, gather again when the concentration of lithium reaches normality in stern notch.Or b) comes the accelerated evaporation effect with heating systems.

The rich lithium bittern temporary storage that pumps is in a sizeable storage pool.This bittern is the saturated magnesium chloride solution of a kind of 1%LiCl of containing, MgCl ₂Can react with the CaO that adds, generate Mg (OH) ₂Precipitation.Magnesium hydroxide can be used as the magnesium cement raw material and goes on the market.Now, add H ₂SO ₄Can make calcium excessive in the bittern generate CaSO ₄Precipitation, this separation method can be in as previous No.08/403364 patent application carry out in original place reactor of narration, or in a factory, implement be the pure lithium chloride (LiCl) that exsiccant is convenient to sell so that obtain final product.

Though the present invention is described with embodiment, should understand not departing under the scope of the invention and can make various modifications and variations that the definition of the scope of the invention should be with reference to the accompanying Claim book.

Claims (7)

1. method of from the bittern that contains solubility major constituent and time component, extracting solubility time component, this method comprises by evaporating bittern at a continuously feeding type evaporator section so that solubility bittern major constituent and solubility bittern time component are optionally separated, described vaporizer comprises a series of evaporation tanks, and then constitute one like the vermiform vaporizer, described solubility bittern major constituent come out by settling the bittern of crossing described vaporizer from Continuous Flow and from described like removing the vermiform vaporizer, so enrichment still be dissolved in described component in the mobile bittern.

2. according to the process of claim 1 wherein that time component is a lithium.

3. according to the method for claim 1, this method comprises uses heating system to be evaporated the temperature of bittern and accelerated evaporation speed with raising.

4. according to the method for claim 3, wherein the accessory constituent of bittern is a lithium.

5. be used for extracting the vaporizer of solubility time component from the bittern that contains major constituent and time component, comprise a kind of with feed end and discharge end and and the device separated by a series of dividing plates with steam capability, make described bittern flow through the equipment of described discharge end continuously from described feed end with being used to, water and solubility major constituent were at first removed from described bittern before described solubility time component reclaims whereby.

6. being used for according to claim 5 from having solubility major constituent and time component bittern to extract the vaporizer of solubility time component, comprise a series of troughs that two ends adjacent one another are are arranged, each of described adjacent slot makes bittern be circuitous flow pattern and flows through whole tank systems linking to each other endways.

7. the vaporizer of claim 5 is wherein separated dividing plate spiral fashion so arrangement in the form of a ring.

Images