CN114933319A - Process for producing lithium hydroxide monohydrate from spodumene and production line thereof - Google Patents
Process for producing lithium hydroxide monohydrate from spodumene and production line thereof Download PDFInfo
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- CN114933319A CN114933319A CN202210629878.6A CN202210629878A CN114933319A CN 114933319 A CN114933319 A CN 114933319A CN 202210629878 A CN202210629878 A CN 202210629878A CN 114933319 A CN114933319 A CN 114933319A
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Abstract
The invention discloses a process for producing lithium hydroxide monohydrate from spodumene, which comprises the following steps: sequentially roasting, grinding, acidifying, pulping, primary impurity removal, secondary impurity removal, concentration, centrifugal separation, low-temperature evaporation crystallization, multiple evaporation crystallization and drying crystallization of spodumene concentrate. And (3) during evaporation crystallization, removing crystals in the mother liquor by pyrolysis, stopping heating when the temperature of the evaporation solution reaches 135 ℃, cooling after the temperature is controlled to be 40-60 ℃, separating out lithium hydroxide monohydrate with larger particles, adding 250-500 ppm fatty alcohol-polyoxyethylene ether, evaporating the mother liquor to 160 ℃, cooling to be 20-30 ℃, and separating out lithium hydroxide monohydrate with smaller particles through multiple crystallization. The problem of low quality of the produced lithium hydroxide monohydrate is solved, and the production cost is greatly reduced. The invention also discloses crystallization equipment for producing the lithium hydroxide monohydrate, which comprises a heating part, a separation part, a condensation part, a filtering part and the like.
Description
Technical Field
The invention relates to a lithium hydroxide production technology, in particular to a process for producing lithium hydroxide monohydrate from spodumene and a production line thereof.
Background
Lithium and its compound are new materials needed for modern scientific and technological development, and become one of future energy sources of Mongolian snakes, and lithium hydroxide monohydrate is a raw material for preparing lithium and its compound, and is used in industries of metallurgy, petrochemical industry, glass, ceramics and the like. The production process of lithium hydroxide monohydrate mainly includes spodumene (limestone) sintering method and lithium carbonate conversion method, in which the first production process is the process for industrially producing lithium hydroxide monohydrate, but said process has the defects of high energy consumption, large material flow, high cost and difficult improvement of product quality, etc. as CN99114696.4 and CN 202011543676.7.
The second way is: compared with the lithium carbonate product produced by the international brine lithium extraction process, the lithium carbonate produced by the spodumene sulfuric acid process has relatively higher price, so that the cost of the lithium hydroxide monohydrate product is influenced, and therefore, how to directly convert the lithium sulfate which is an intermediate product in the sulfuric acid process flow into the lithium hydroxide becomes an effective way for reducing the cost of the lithium hydroxide monohydrate product. In the reference, the "solution crystallization method for producing lithium hydroxide monohydrate" mentions that the quality of the product is directly affected by the control of the product crystallization during the production process of the lithium hydroxide monohydrate. In view of this, the invention provides a process for producing lithium hydroxide monohydrate from spodumene, which can reduce the cost of producing lithium hydroxide monohydrate from the existing spodumene and can solve the problem of low quality of lithium hydroxide produced from spodumene.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a process for producing lithium hydroxide monohydrate from spodumene and a production line thereof, and the process has the advantages of reducing the cost of producing lithium hydroxide monohydrate from lithium ore, improving the quality of producing lithium hydroxide and the like.
The technical scheme of the invention is realized as follows:
a process for producing lithium hydroxide monohydrate from spodumene is characterized by comprising the following steps:
step 1, selecting natural spodumene concentrate, roasting the natural spodumene concentrate at 1100 ℃ for 30min, and roasting in a rotary kiln to convert alpha-lithium concentrate into beta-lithium concentrate which is easy to react with sulfuric acid;
step 2, crushing and grinding the lithium concentrate obtained in the step 1 to obtain powder with the granularity larger than 50 um;
step 3, adding concentrated sulfuric acid into the powder obtained in the step 2, wherein the main component of the lithium concentrate is lithium carbonate (Li) 2 Co 3 ) And a small amount of calcium carbonate (CaCo) 3 ) Adding concentrated sulfuric acid (H) 2 So 4 ) Then evenly stirring, wherein the reaction temperature is 200-300 ℃, and extracting lithium elements in the lithium concentrate;
step 4, adding water for pulping and leaching, and introducing hot air to change solid lithium sulfate into a lithium sulfate solution;
step 5, adding calcium carbonate into the lithium sulfate solution in the step 4 until the pH value is 5-6, adding quicklime into the solution until the pH value is 12-13, and stirring and reacting for 15min to obtain a mixture;
step 6, filtering impurities such as iron, calcium, magnesium and the like in the mixture in the step 5, washing filter residues for 5min by using water, and merging washing liquid into filtrate;
step 7, adding sodium carbonate into the filtrate obtained in the step 6, performing ion exchange, further removing calcium, and filtering the precipitate;
8, evaporating and concentrating the solution in the step 7 until the solution ratio is 1: 1.2, and controlling the temperature to be not less than 100 ℃ to evaporate water in the solution;
step 9, adding sodium hydroxide, cooling to-10 to-15 ℃, removing sodium sulfate by utilizing the property of low solubility of the sodium sulfate at low temperature to form a lithium hydroxide solution with a certain concentration, and centrifugally separating the solution to obtain sodium sulfate decahydrate to obtain a mother solution;
step 11, obtaining fine lithium hydroxide monohydrate from the residual mother liquor in the step 10 in a multi-crystallization mode;
and step 12, drying the lithium hydroxide monohydrate.
In the process for producing the lithium hydroxide monohydrate, the mother liquor is added to dilute the reaction solution before the step 10 is carried out, the crystals in the mother liquor are eliminated by pyrolysis, the temperature of the evaporation solution in the step 10 is up to 135 ℃, the heating is stopped, the cooling is carried out, the temperature is controlled to be 40-60 ℃, and the lithium hydroxide monohydrate with larger particles is separated out.
In the process for producing the lithium hydroxide monohydrate, 250-500 ppm of fatty alcohol-polyoxyethylene ether is added in the step 11, the mother liquor is evaporated to 160 ℃, the cooling temperature is controlled to be 20-30 ℃, and the lithium hydroxide monohydrate with smaller particles is separated out through multiple crystallization.
The utility model provides a production line of lithium hydroxide monohydrate, a serial communication port, the production line has a crystallization equipment, and the crystallization equipment includes heating part, separation part and condensing part, heating part includes first heating member and second heating member, the separation part includes first separation piece and second separation piece, first heating member is connected with first separation piece, first separation piece is connected with the second heating member, the second heating member is connected with the second separation piece, and the second separation piece is connected with the condensing part.
In the production line of the process for producing the lithium hydroxide monohydrate, the first heating element and the second heating element are both provided with steam outlet valves, the two steam outlet valves are connected, the heating element further comprises a solution circulating valve and a first connecting valve, the solution circulating valve is positioned on one side of the lower end of the heating element, and the first connecting valve is connected with the heating element.
In the production line of the process for producing the lithium hydroxide monohydrate, the lower end of the separating piece is connected with the driving piece, two sides of the upper end of the separating piece are connected with the fixing piece, the top of the separating piece is provided with the second connecting valve, the middle of the separating piece is provided with the third connecting valve, the first connecting valve is communicated with the second connecting valve, the output shaft of the driving piece is connected with the rotating piece, and the rotating piece is positioned at the axis of the separating piece and is connected with the separating piece.
In the production line of the process for producing the lithium hydroxide monohydrate, the condensation part comprises a condensation piece, and the condensation piece mainly comprises a fourth connecting valve, a condensation plate, a condensation net and a cold water inlet valve, wherein the fourth connecting valve is arranged at the top of the condensation piece, the fourth connecting valve is connected with the third connecting valve, the condensation plate is fixedly connected to the middle part of the condensation piece, and the condensation net is arranged at the lower end of the condensation piece.
In the production line of the process for producing the lithium hydroxide monohydrate, the top of the condensation part is connected with the filtering part, wherein the condensation part is connected with the second separating piece through the filtering part.
In the production line of the process for producing lithium hydroxide monohydrate, the condensation net comprises an annular frame, a limiting piece is arranged on the annular frame, and the annular frame is connected to the lower end of the condensation part through the limiting piece.
In the production line of the process for producing the lithium hydroxide monohydrate, the annular frame is also connected with an arc-shaped net, the arc-shaped net is composed of a plurality of condensing pipes, the center of the annular frame is also connected with a filter element, and the filter element is provided with a plurality of condensing pipes.
In the production line of the process for producing the lithium hydroxide monohydrate, the hot air entering the first heating element is output through the two first connecting valves and is secondarily utilized in the second heating element, so that the cost benefit of equipment can be saved.
The process for producing the lithium hydroxide monohydrate by using the spodumene and the production line thereof have the following beneficial effects: the process for producing the lithium hydroxide monohydrate by the spodumene carries out secondary purification on the mother solution, solves the problem of low quality of the produced lithium hydroxide monohydrate, and simultaneously greatly reduces the production cost. According to the production line for producing the lithium hydroxide monohydrate by the spodumene, disclosed by the invention, the crystallization equipment adopts repeated crystallization, so that the quality of the lithium hydroxide monohydrate is further improved, meanwhile, hot steam is secondarily utilized, and the production cost can be reduced. Wherein, the separating piece stirs the mother liquor when the mother liquor is crystallized, so that the crystals become coarse, smooth and loose, thereby achieving the function of preventing agglomeration.
Drawings
FIG. 1 is a process diagram of the present invention for producing lithium hydroxide monohydrate;
FIG. 2 is a block diagram of a process for producing lithium hydroxide monohydrate production line according to the present invention;
FIG. 3 is a schematic view of the structure of a crystallization apparatus according to the present invention;
FIG. 4 is a schematic structural view of a heating section according to the present invention;
FIG. 5 is a schematic view of the structure of the separation section of the present invention;
FIG. 6 is a partial schematic view of the condenser section according to the present invention;
FIG. 7 is a schematic diagram of the structure of a condensing net according to the present invention;
FIG. 8 is a partial structural view of a condensing net according to the present invention;
FIG. 9 is a schematic partial structure view of FIG. 8, showing primarily the ring frame structure;
fig. 10 is a schematic view of a portion of the construction of fig. 7, primarily showing the filter cartridge construction;
fig. 11 is a partial schematic structural view of fig. 7, mainly showing an arc-shaped net structure.
The reference numbers are given as: 10-heating part, first heating part 101, second heating part 102, 11-steam outlet valve, 12-first connecting valve, 13-solution circulating valve, 14-heating pipe, 15-filter plate, 20-separating part, first separating part 201, second separating part 202, 21-lower containing part, 22-motor, 23-fixing part, 24-second connecting valve, 25-lower containing part, 26-impeller rod, 27-blade, 28-third connecting valve, 30-condensing part, 31-condensing part, 32-fourth connecting valve, 33-condensing plate, 34-condensing net, 341-ring frame, 342-limiting part, 343-arc net, 344-mounting hole, 345-positioning block, 346-condensing pipe, 347-filter core, 35-cold water inlet valve, 40-first connection, 50-second connection, 60-filter.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in FIG. 1, the process for producing lithium hydroxide monohydrate from spodumene of the present invention is characterized by comprising the following steps:
step 1, selecting natural spodumene concentrate, roasting the natural spodumene concentrate for 30min at 1100 ℃, and roasting in a rotary kiln to convert alpha-lithium concentrate into beta-lithium concentrate which is easy to react with sulfuric acid;
step 2, crushing and grinding the lithium concentrate obtained in the step 1 to obtain powder with the granularity larger than 50 um;
step 3, adding concentrated sulfuric acid into the powder obtained in the step 2, wherein the main component of the lithium concentrate is lithium carbonate (Li) 2 Co 3 ) And a small amount of calcium carbonate (CaCo) 3 ) Adding concentrated sulfuric acid (H) 2 So 4 ) Then evenly stirring, wherein the reaction temperature is 200-300 ℃, and lithium in the lithium concentrate is treatedElements are extracted, and the main reaction formula is as follows:
li2Co 3+ H2So4 → Li2So4+ Co2+ H2o, i.e., CaCo3+ H2So4 → CaSo4+ H2o + Co2
Step 4, adding water for pulping and leaching, and introducing hot air to change solid lithium sulfate into a lithium sulfate solution;
step 5, adding calcium carbonate (CaCo) into the lithium sulfate solution in the step 4 3 ) Adding quicklime to a pH value of 5-6, stirring and reacting for 15min to obtain a mixture;
step 6, filtering impurities such as iron, calcium, magnesium and the like in the mixture in the step 5, washing filter residues for 5min by using water, and merging washing liquid into filtrate;
step 7, adding sodium carbonate (NaCo) into the filtrate obtained in step 6 3 ) And performing ion exchange to further remove calcium, and filtering the precipitate; (the main reaction formula is Ca 2+ +Co 3 2- =CaCo 3 ）
8, evaporating and concentrating the solution in the step 7 until the solution ratio is 1: 1.2, and controlling the temperature to be not less than 100 ℃ to evaporate water in the solution;
step 9, adding sodium hydroxide, cooling to-10 to-15 ℃, removing sodium sulfate by utilizing the property of low solubility of the sodium sulfate at low temperature to form a lithium hydroxide solution with a certain concentration, and centrifuging the solution to obtain sodium sulfate decahydrate to obtain a mother solution; the main reaction formula is as follows:
Li2So4+2NaOH+10H2O→ 2LiOH+Na2So4•10H2O
the obtained mother liquor can not be directly used for producing lithium hydroxide due to higher sulfate ion and sodium ion content in the mother liquor, and the mother liquor needs to be purified by a crystallization method;
step 11, obtaining refined lithium hydroxide monohydrate from the residual mother liquor in the step 10 in a multi-crystallization mode, adding 250-500 ppm of fatty alcohol-polyoxyethylene ether into the step 11, evaporating the mother liquor to 160 ℃, controlling the cooling temperature to be 20-30 ℃, and crystallizing for multiple times to separate out lithium hydroxide monohydrate with smaller particles, wherein the lithium hydroxide is a water-soluble crystalline substance, the kinetic condition of crystallization of the water-soluble substance can be changed due to the existence of a surface active substance (fatty alcohol-polyoxyethylene ether), and a certain amount of surfactant (fatty alcohol-polyoxyethylene ether) is added into the mother liquor in the crystallization process to act on the crystal shape of the lithium hydroxide monohydrate, so that the crystals become coarse, smooth and loose, and the effect of preventing agglomeration is achieved;
and step 12, drying the lithium hydroxide monohydrate, wherein after the lithium hydroxide monohydrate is subjected to centrifugal separation, 5% of free water is contained in a solid phase, the material is in a loose state and is relatively easy to dry, steam drying can be adopted, and the temperature is controlled to be not less than 100 ℃. (the main reaction formula is LiOH. H2O → LiOH + H2O)
Cost control is one of the cores of comprehensive competition of lithium chemical enterprises, wherein product quality can be improved, unit product cost can be reduced through continuous improvement and innovation of various production processes, equipment and technologies, price-premium capability of high-end products can be increased through product differentiation strategies, cost benefit is ensured, and overall profitability is improved.
The invention also discloses a production line for producing the lithium hydroxide monohydrate, which comprises roasting equipment, grinding equipment, acidification equipment, pulping equipment, impurity removal equipment, concentration equipment, centrifugal equipment and crystallization equipment. The present invention further improves the crystallization apparatus. As shown in fig. 3 to 11, the crystallization apparatus includes a heating part 10, a separation part 20, and a condensation part 30. The heating part 10 includes a first heating member 101 and a second heating member 102, and the separating part 20 includes a first separating member 201 and a second separating member 202. The first heating member 101 is connected to the first separating member 201 through the first connecting portion 40, the first separating member 201 is connected to the second heating member 102 through the second connecting portion 50, and the second heating member 102 is connected to the second separating member 202. The filtering part 60 is connected to the top of the condensing part 30, and the second separating member 202 is connected to the filtering part 60 by the second connecting part 50.
As shown in fig. 4, the first heating member 101 is structurally identical to the second heating member 102. The heating member includes a vapor outlet valve 11, a first connection valve 12, a solution circulation valve 13, a heating pipe 14, and a filter sheet 15. Wherein the steam outlet valves of the two heating members are connected to each other, and the first connecting valve 12 is located on the heating member and is communicated with the heating member. The solution circulating valve 13 is positioned at one side of the lower end of the heating element, the heating pipe 14 is fixedly connected inside the heating element, the filter plate 15 is positioned right below the heating pipe 14, and the filter plate 15 is fixed inside the heating element.
As shown in fig. 5, the first separating member 201 is structurally identical to the second heating member 102. The separating member includes an upper receiving member 21, a motor 22, a fixing member 23, a second connection valve 24, a lower receiving member 25, an impeller stem 26, a vane 27, and a third connection valve 28. The top of the upper receiving member 21 is communicated with the second connection valve 24, and the second connection valve 24 of the first separating member 201 is communicated with the first connection valve 12 of the first heating member 101 through the cooperation of the first connection part 40 and the second connection part 50. The fixing members 23 are located at both sides of the upper receiving member 21, and are used to fixedly connect the upper receiving member 21 to the inside of the separating member. The lower receiving member 25 is fixedly connected to the upper receiving member 21 and is internally communicated. The bottom of the lower accommodating part 25 is connected with the motor 22, the output shaft of the motor 22 is connected with an impeller rod 26, and the impeller rod 26 is connected with blades 27. The impeller rod 26 is located at the axial center of the lower housing 25 and is rotatably connected to the lower housing 25. The third connection valve 28 is located at the middle of the lower receiving member 25 and communicates with the lower receiving member 25.
As shown in fig. 3, after step 9, the reaction solution is diluted by adding a mother liquor, and the crystals in the mother liquor are eliminated by pyrolysis. The obtained mother liquor is input into the first heating member 101 from the lower end of the first heating member 101 from top to bottom, and the mother liquor is filtered by the filter plate 15. Hot air is then supplied from the lower port of the first connection part 40 to heat the tube 14 inside the first heating member 101 to 135 ℃. The mother liquor is maintained in a supersaturated state, and the saturated mother liquor is fed to the first separator 201 to be cooled and crystallized. The solution is cooled at a very low rate during the initial phase, and the cooling rate is gradually increased as the crystal surface grows.
When the 135 ℃ saturated mother liquor enters the first separating part 201, the temperature of the saturated mother liquor is reduced to 40-60 ℃, the motor 22 is started, and the motor 22 drives the impeller rod 26 and the upper blades thereof to rotate so as to stir the saturated mother liquor in the separating part. Stopping heating, cooling, and discharging the lithium hydroxide monohydrate with larger precipitated particles through a bottom opening of the first separating piece 101. Wherein, in order to control the growth of crystal, prevent extra nucleation and produce, control the supersaturation of mother liquor in metastable zone, add the seed crystal of suitable granularity to mother liquor for this reason, let the solute of being crystallized grow on the seed crystal surface, stir slowly, make the seed crystal suspend in whole solution more evenly to avoid secondary nucleation phenomenon to appear as far as possible. The hardness, the configuration and the stirring speed of the evaporation stirring paddle have great influence on the nucleation rate. The hard blade and the too fast stirring speed can break up the nucleated crystals, so that the crystal edge generation amount is too much, the supersaturation degree is too high, the product granularity is fine, the contact chance of eucalyptus globulus is increased, and the bonding of crystal grains is accelerated.
Adding 250-500 ppm fatty alcohol-polyoxyethylene ether into the residual mother liquor which is not crystallized out in the first separating part 201, inputting the mother liquor into the second heating part 102 through the second connecting part 50, and evaporating the mother liquor to 160 ℃. The mother liquor is then fed into the second separator 202. The mono-permanent lithium hydroxide is a water-soluble crystalline substance, the existence of a surface active substance can change the kinetic condition of crystallization of the water-soluble substance, and in the crystallization process, a certain amount of surfactant is added into the mother liquor, so that the crystal shape of the mono-permanent lithium hydroxide can be acted, the crystal is thickened, smoothed and loosened, and the effect of preventing agglomeration is achieved. The mother liquor is evaporated to 160 ℃, the crystals precipitated by the second separating member 202 are discharged through the bottom port of the second separating member 202, and are input into the first heating member 101 for the second time, and the above steps are repeated.
Wherein, the hot air is inputted from the lower port of the first connection part 40, passes through the first heating member 101, and is discharged from the first connection valve. The exhaust hot air conduit is again connected to feed into the second heating element 102 and the hot air from the row of second heating elements 102 is likewise circulated back into the second heating element 102. By adopting the design, the operation cost is reduced, and the resources are saved.
While maintaining a stable supersaturation degree, mechanical collision of the crystals is reduced as much as possible. As shown in fig. 5 to 10, a filter part 60 is connected to the top of the condensation part 30, wherein the condensation part 30 is connected to the second separation member 202 through the filter part 60 and the second connection part 40. The condensation part 30 includes a condensation member 31, a fourth connection valve 32, a condensation plate 33, a condensation net 34, and a cold water inlet valve 35. The condensing part 30 is internally connected with a condensing member 31, and the top of the condensing member 31 is connected with a fourth connecting valve 32. The condensing plate 33 is fixedly connected to the inside of the condensing member 31, and the condensing net 34 is located right below the condensing plate 33. The cold water inlet valve 35 is located at a lower end side of the condensing member 31, and the cold water inlet valve 35 communicates with the condensing member 31.
The residual saturated mother liquor in the second separating member 202 is input into the filtering portion 60 through the second connecting portion 50, the filtering portion 60 is connected with the condensing portion 30, and the residual saturated mother liquor enters the condensing portion 30 and then is injected into the condensing portion 30. The residual saturated mother liquor is cooled by a condensing plate 33 and a condensing net 34, the cooling temperature is controlled at 20-30 ℃, and crystals are separated out.
As shown in fig. 7 to 11, the condensation net 34 mainly comprises an annular frame 341, a limiting member 342, an arc net 343, a mounting hole 344, a positioning block 345, a condensation pipe 346 and a filter element 347. As shown in fig. 9, a limiting member 342 is mounted on the annular frame 341, and the annular frame 341 is fixedly connected to the bottom of the condensing member 31 through the limiting member 342. Wherein, the arc net 343 is detachably connected with the annular frame 341. The arc-shaped net 343 is provided with mounting holes 344, and positioning blocks 345 are further provided at both sides of the arc-shaped net 343. The arc net 343 is mounted on the ring frame 341 through a positioning block 345, and the arc net 343 is fixed through the mounting hole 344. The arc-shaped net 343 is connected with a plurality of condenser tubes 346, every two condenser tubes 346 are wound by fiber belts, the middle part of the annular frame 341 is also connected with a filter element 347, the filter element 347 is provided with a plurality of condenser tubes 346, and every two condenser tubes 346 are wound by the fiber belts. The condensation net adopts a distributed design, so that the product is discharged in a grading way, and a uniform product with good crystallization and proper size is obtained.
And drying the lithium hydroxide monohydrate, wherein after the lithium hydroxide monohydrate is subjected to centrifugal separation, 5% of free water is contained in a solid phase, the material is in a loose state and is relatively easy to dry, steam drying can be adopted, and the temperature is controlled to be not less than 100 ℃ so as to obtain the lithium hydroxide monohydrate with higher quality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A process for producing lithium hydroxide monohydrate from spodumene is characterized by comprising the following steps:
step 1, selecting natural spodumene concentrate, roasting the natural spodumene concentrate for 30min at 1100 ℃ to obtain easily-acidified spodumene concentrate;
step 2, crushing and grinding the lithium concentrate obtained in the step 1 to obtain powder with the granularity larger than 50 um;
step 3, adding concentrated sulfuric acid into the powder obtained in the step 2, and extracting lithium element in the lithium concentrate, wherein the reaction temperature is 200-300 ℃;
step 4, adding water for pulping and leaching, and introducing hot air to change solid lithium sulfate into a lithium sulfate solution;
step 5, adding calcium carbonate into the lithium sulfate solution in the step 4 until the pH value is 5-6, adding quicklime into the solution until the pH value is 12-13, and stirring and reacting for 15min to obtain a mixture;
step 6, filtering impurities such as iron, calcium, magnesium and the like in the mixture in the step 5, washing filter residues for 5min by using water, and merging washing liquid into filtrate;
step 7, adding sodium carbonate into the filtrate obtained in the step 6, carrying out ion exchange, further removing calcium, and filtering the precipitate;
step 8, evaporating and concentrating the solution in the step 7 until the solution ratio is 1: 1.2;
step 9, adding sodium hydroxide, cooling to-10 to-15 ℃, and centrifugally separating the solution to obtain sodium sulfate decahydrate to obtain mother liquor;
step 10, evaporating, concentrating and crystallizing the mother liquor obtained in the step 9 to obtain crude lithium hydroxide monohydrate;
step 11, obtaining fine lithium hydroxide monohydrate from the residual mother liquor in the step 10 in a multi-crystallization mode;
and step 12, drying the lithium hydroxide monohydrate.
2. The process for producing lithium hydroxide monohydrate according to claim 1, wherein the mother liquor is added to dilute the reaction solution before the step 10, the crystallization in the mother liquor is eliminated by pyrolysis, the temperature of the evaporation solution in the step 10 is up to 135 ℃, the heating is stopped, the solution is cooled, the temperature is controlled to be 40-60 ℃, and lithium hydroxide monohydrate with larger particles is separated out.
3. The process for producing lithium hydroxide monohydrate according to claim 1 or 2, wherein 250-500 ppm of fatty alcohol-polyoxyethylene ether is added in the step 11, the mother liquor is evaporated to 160 ℃, the cooling temperature is controlled to 20-30 ℃, and lithium hydroxide monohydrate with smaller particles is separated out through multiple crystallization.
4. A production line for implementing a process for producing lithium hydroxide monohydrate according to claim 1, wherein the production line comprises a crystallization apparatus, the crystallization apparatus comprises a heating part, a separation part and a condensation part, the heating part comprises a first heating element and a second heating element, the separation part comprises a first separation element and a second separation element, the first heating element is connected with the first separation element, the first separation element is connected with the second heating element, the second heating element is connected with the second separation element, and the second separation element is connected with the condensation part.
5. The production line of claim 4, wherein the first heating element and the second heating element are both provided with steam outlet valves, and the two steam outlet valves are connected, the heating element further comprises a solution circulating valve and a first connecting valve, the solution circulating valve is positioned on one side of the lower end of the heating element, and the first connecting valve is connected with the heating element.
6. The production line of a process for producing lithium hydroxide monohydrate of claim 5, wherein the lower end of the separating member is connected with a driving member, the two sides of the upper end of the separating member are connected with a fixing member, the top of the separating member is provided with a second connecting valve, the middle of the separating member is provided with a third connecting valve, the first connecting valve is communicated with the second connecting valve, and the output shaft of the driving member is connected with a rotating member which is positioned at the axis of the separating member and is connected with the separating member.
7. The production line of the process for producing lithium hydroxide monohydrate of claim 6, wherein the condensation part comprises a condensation member, and the condensation member mainly comprises a fourth connection valve, a condensation plate, a condensation net and a cold water inlet valve, wherein the fourth connection valve is arranged at the top of the condensation member, the fourth connection valve is connected with the third connection valve, the condensation plate is fixedly connected with the middle part of the condensation member, and the condensation net is arranged at the lower end of the condensation member.
8. The production line of lithium hydroxide monohydrate process according to claim 7, wherein a filtering part is connected to the top of the condensing part, wherein the condensing part is connected with the second separating member through the filtering part.
9. The production line of claim 7, wherein the condensing net comprises a ring frame, the ring frame is provided with a limiting member, and the ring frame is connected to the lower end of the condensing part through the limiting member.
10. The production line of the process for producing lithium hydroxide monohydrate of claim 9, wherein the annular frame is further connected with an arc-shaped net, the arc-shaped net is composed of a plurality of condensing pipes, a filter element is further connected to the center of the annular frame, and the filter element is provided with a plurality of condensing pipes.
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