CN215694059U - System for preparing boric acid by extracting boron from natural alkali liquor - Google Patents
System for preparing boric acid by extracting boron from natural alkali liquor Download PDFInfo
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- CN215694059U CN215694059U CN202122155223.3U CN202122155223U CN215694059U CN 215694059 U CN215694059 U CN 215694059U CN 202122155223 U CN202122155223 U CN 202122155223U CN 215694059 U CN215694059 U CN 215694059U
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Abstract
The utility model discloses a system for preparing boric acid by extracting boron from natural alkali liquor, wherein a discharge hole of a boron ion exchange resin column is respectively communicated with a boron removal mother liquor barrel and a flushing water barrel, an elution inlet of the boron ion exchange resin column is communicated with a liquid outlet of a boron elution liquor barrel through a pickling liquor pipe, and an elution outlet is communicated with a liquid inlet of the boron elution liquor barrel through an elution liquor pipe; the liquid outlet of the boron eluent barrel is also communicated with the inlet of the evaporation unit, the boric acid rich liquid outlet of the evaporation unit is communicated with the inlet of the cold separation tank, the outlet of the cold separation tank is communicated with the centrifugal machine, the liquid phase outlet of the centrifugal machine is communicated with the inlet of the boric acid mother liquid barrel, and the outlet of the boric acid mother liquid barrel is communicated with the inlet of the evaporation unit. The utility model has the advantages that: the boron ion exchange resin absorbs boron ions in the natural alkali liquor, so that the boron content in the soda ash and the baking soda products is reduced; the obtained boric acid solid can be used as a glass manufacturing raw material and the like for resource utilization by adopting modes of evaporation, cold crystallization, centrifugation and the like, and does not cause harm to the environment.
Description
The technical field is as follows:
the utility model relates to a system for preparing boric acid, in particular to a system for preparing boric acid by extracting boron from natural alkali liquor.
Background art:
at present, the production of soda and baking soda mainly adopts an ammonia-soda process, a combined soda process and a natural soda process, wherein the ammonia-soda process and the combined soda process use sodium chloride as raw materials, a semi-finished product is calcined to obtain soda, soda liquid is carbonized to obtain a baking soda product, and the impurity content of the product is relatively stable because the purity of raw material salt is higher and the impurities are less.
The method for producing soda and sodium bicarbonate by trona process comprises using underground trona ore as raw material, wherein trona mainly exists in underground trona ore and trona lake, and the main component of underground trona ore is sodium sesquicarbonate (Na)2CO3·NaHCO3·H2O), in addition, it contains a small amount of impurity elements such as boron, iron, etc., and the contents of sodium carbonate and sodium bicarbonate in different ore bodies are somewhat different due to differences in geological causes. The underground trona ore is injected with water into an underground alkali layer in a water-soluble mining mode to form a dissolving cavity underground, and the obtained saturated solution is returned to a ground brine storage tank for downstream production of soda ash and baking soda.
The main technological process for producing soda ash and sodium bicarbonate by using trona includes evaporation process and carbonization process according to the composition of bittern, in which the evaporation process can be divided into sesquisoda evaporation process and monohydrate soda evaporation process, and sodium sesquicarbonate (Na) can be obtained respectively2CO3·NaHCO3·H2O) and monohydrate of soda (Na)2CO3·H2O) semi-finished product, and then calcined to obtain sodium carbonate (Na)2CO3) And (5) producing the product. The carbonization method is that natural alkali liquor reacts with carbon dioxide to obtain sodium bicarbonate semi-finished product (NaHCO)3) And drying by dry hot air flow to obtain a finished product of sodium bicarbonate.
In the process of producing the calcined soda and the baking soda by adopting the trona method, because underground trona ore contains a small amount of boron impurity elements, boron ions in the natural alkali liquor mainly exist in the form of sodium borate, the boron element content of the alkali liquor is increased due to evaporation and concentration of raw material liquid in the alkali production process, the boron content in the alkali production mother liquor reaches 600mg/l, the high boron content in the calcined soda and the baking soda products can reduce the high-quality product rate, and certain influence is caused on the product quality.
The method for removing boron in the water body mainly comprises a chemical precipitation method, boron selective ion exchange resin, a reverse osmosis method and an activated carbon adsorption method, and each method has the application range. For example, in hou xiao xin in research on methods for removing boron from water, the Dian dawn in research on methods for removing boron from seawater, chemical precipitation methods for removing boron have been described, in which boron is precipitated mainly by adding calcium salt and aluminum salt to a high-content water body, but the removal rate of boron is not high, and the boron-containing precipitates cannot be utilized well, thereby causing environmental pollution.
The utility model has the following contents:
in order to solve the technical problems, the utility model aims to provide a system for preparing boric acid by extracting boron from natural alkali liquor.
The utility model is implemented by the following technical scheme: a system for preparing boric acid by extracting boron from natural alkali liquor comprises a boron ion exchange resin column, a boron removal mother liquor barrel, a flushing water barrel, a boron elution liquid barrel, an evaporation unit, a cold separation tank, a centrifugal machine and a boric acid mother liquor barrel, wherein a feed inlet of the boron ion exchange resin column is respectively communicated with a natural alkali liquor pipe and a water pipe, a discharge outlet of the boron ion exchange resin column is respectively communicated with the boron removal mother liquor barrel and the flushing water barrel, an elution inlet of the boron ion exchange resin column is communicated with a liquid outlet of the boron elution liquid barrel through a pickling liquid pipe, an elution outlet of the boron ion exchange resin column is communicated with a liquid inlet of the boron elution liquid barrel through an elution liquid pipe, a liquid outlet of the boron elution liquid barrel is communicated with an inlet of the evaporation unit, a boric acid rich liquid outlet of the evaporation unit is communicated with an inlet of the cold separation tank, an outlet of the cold separation tank is communicated with the centrifugal machine, and a liquid phase outlet of the centrifuge is communicated with an inlet of the boric acid mother liquor barrel, and an outlet of the boric acid mother liquor barrel is communicated with an inlet of the evaporation unit.
Further, the boron ion exchange resin column comprises a boron ion exchange resin column A and a boron ion exchange resin column B, feed inlets of the boron ion exchange resin column A and the boron ion exchange resin column B are both communicated with a natural alkali liquor pipe and a water pipe, and valves are arranged on the natural alkali liquor pipe and the water pipe which are communicated with the boron ion exchange resin column A and the boron ion exchange resin column B; the discharge ports of the boron ion exchange resin column A and the boron ion exchange resin column B are both communicated with the boron removal mother liquor barrel and the flushing water barrel, and valves are arranged on pipelines communicated between the boron ion exchange resin column A and the boron removal mother liquor barrel as well as between the boron ion exchange resin column B and the flushing water barrel;
elution inlets of the boron ion exchange resin column A and the boron ion exchange resin column B are both communicated with the pickling solution pipe, and valves are arranged on pickling solution pipes communicated with the boron ion exchange resin column A and the boron ion exchange resin column B; the elution outlets of the boron ion exchange resin column A and the boron ion exchange resin column B are both communicated with the elution liquid pipe, and valves are arranged on the elution liquid pipes communicated with the boron ion exchange resin column A and the boron ion exchange resin column B.
Preferably, the evaporation unit comprises a steam pipe, a preheater and a forced circulation evaporator, wherein a cold medium inlet of the preheater is communicated with an outlet of the boron elution liquid tank, a cold medium outlet of the preheater is communicated with a feed inlet of the forced circulation evaporator, and a boric acid rich liquid outlet of the forced circulation evaporator is communicated with the cold separation tank; the steam pipe is communicated with a heating chamber steam inlet of the forced circulation evaporator, and a heating chamber steam outlet of the forced circulation evaporator is communicated with a heat medium inlet of the preheater.
Further, the evaporation unit further comprises a vapor compressor, an inlet of the vapor compressor is communicated with a vapor outlet of the forced circulation evaporator, and an outlet of the vapor compressor is communicated with a vapor inlet of a heating chamber of the forced circulation evaporator.
When boron ions adsorbed on the boron ion exchange resin column are eluted, hydrochloric acid with proper concentration is injected into a boron eluent barrel, then a pickling pump is started to circularly elute the boron ion exchange resin column until the boron ions in the boron eluent reach certain concentration, the elution is stopped, and the boron eluent in the boron eluent barrel is sent into a subsequent evaporation unit for treatment.
The mode of adopting circulation elution boron ion exchange resin column is handled in this scheme, realizes the purpose of boron ion elution on the one hand, and on the other hand realizes the boron ion enrichment in the eluant, improves the effect of boron ion concentration, the subsequent evaporation of being convenient for is handled.
The utility model has the advantages that:
1. according to the scheme, the boron ion exchange resin column is arranged to adsorb boron ions in the natural alkali liquor, so that the boron content in soda and baking soda products obtained by subsequent treatment is reduced, and the excellent rate and quality of the soda and baking soda products are improved;
2. according to the scheme, the boron-containing solution with high concentration is obtained by resolving and adsorbing the saturated boron ion exchange resin column with hydrochloric acid, and a boric acid solid product is obtained by adopting modes such as evaporation, cold precipitation crystallization and centrifugation, and the obtained boric acid solid can be used as a glass manufacturing raw material for resource utilization, and the harm to the environment is avoided.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for preparing boric acid by extracting boron from a natural alkali solution according to this embodiment.
In the figure, a boron ion exchange resin column A1, a boron ion exchange resin column B2, a boron removal mother liquor barrel 3, a flushing water barrel 4, a boron elution liquid barrel 5, a preheater 6, a forced circulation evaporator 7, a steam compressor 8, a cold separation tank 9, a centrifuge 10, a boric acid mother liquor barrel 11, a natural alkali liquor pipe 12, a water pipe 13, an acid washing liquid pipe 14, an elution liquid pipe 15 and a steam pipe 16.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a system for preparing boric acid by extracting boron from natural alkali liquor comprises a boron ion exchange resin column A1, a boron ion exchange resin column B2, a boron removal mother liquor barrel 3, a flushing water barrel 4, a boron elution liquor barrel 5, a steam pipe 16, a preheater 6, a forced circulation evaporator 7, a steam compressor 8, a cold separation tank 9, a centrifuge 10 and a boric acid mother liquor barrel 11; the feed inlets of the boron ion exchange resin column A1 and the boron ion exchange resin column B2 are both communicated with a natural alkali liquor pipe 12 and a water pipe 13, and valves are arranged on the natural alkali liquor pipe 12 and the water pipe 13 which are communicated with the boron ion exchange resin column A1 and the boron ion exchange resin column B2; the discharge ports of the boron ion exchange resin column A1 and the boron ion exchange resin column B2 are communicated with the boron removal mother liquor barrel 3 and the flushing water barrel 4, and valves are arranged on pipelines communicated with the boron ion exchange resin column A1, the boron removal mother liquor barrel 3 and the flushing water barrel 4 and pipelines communicated with the boron ion exchange resin column B2, the boron removal mother liquor barrel 3 and the flushing water barrel 4; elution inlets of the boron ion exchange resin column A1 and the boron ion exchange resin column B2 are communicated with an outlet of the boron eluent barrel 5 through an acid eluent tube 14, and valves are arranged on the acid eluent tube 14 communicated with the boron ion exchange resin column A1 and the boron ion exchange resin column B2; elution outlets of the boron ion exchange resin column A1 and the boron ion exchange resin column B2 are communicated with an inlet of the boron elution liquid barrel 5 through an elution liquid pipe 15, and valves are arranged on the elution liquid pipes 15 communicated with the boron ion exchange resin column A1 and the boron ion exchange resin column B2.
The outlet of the boron eluent barrel 5 is also communicated with the cold medium inlet of the preheater 6, the cold medium outlet of the preheater 6 is communicated with the feed inlet of the forced circulation evaporator 7, and the boric acid rich solution outlet of the forced circulation evaporator 7 is communicated with the cold-separation tank 9; the steam pipe 16 is communicated with a heating chamber steam inlet of the forced circulation evaporator 7, and a heating chamber steam outlet of the forced circulation evaporator 7 is communicated with a heat medium inlet of the preheater 6; the inlet of the vapor compressor 8 is communicated with the vapor outlet of the forced circulation evaporator 7, and the outlet of the vapor compressor 8 is communicated with the heating chamber vapor inlet of the forced circulation evaporator 7.
The outlet of the cold separation tank 9 is communicated with a centrifuge 10, the liquid phase outlet of the centrifuge 10 is communicated with the inlet of a mother liquid barrel 11 of boric acid, and the outlet of the mother liquid barrel 11 of boric acid is communicated with the feed inlet of the forced circulation evaporator 7.
The working principle is as follows:
as shown in fig. 1, the material comprises: natural alkali liquor a, condensate water b, fresh water c, washing water d, cooling return water e, cooling upper water f, boric acid solid h, 35% hydrochloric acid i and desalted water j.
The process for production using the system of the present invention is described as follows:
(1) adsorption: the natural alkali liquor a from the previous process, wherein the sodium carbonate content is about 320g/l, the boron content is about 600mg/l, the temperature is 30-60 ℃, the natural alkali liquor a with low boron content is obtained after ion exchange, the sodium carbonate content is about 320g/l, the boron content is less than 20mg/l, the boron removal rate is more than 96%, the natural alkali liquor a with low boron content enters a boron removal mother liquor barrel 3, and the natural alkali liquor a is sent to the carbonization or evaporation process through a boron removal mother liquor pump;
(2) washing: after the boron ion exchange resin column A1 with the set adsorption time is saturated to adsorb boron, the boron ion exchange resin column B2 needs to be switched to continue adsorbing boron in the natural alkali liquor a, and the saturated boron ion exchange resin column A1 needs to be washed and regenerated. The specific operation is that the pump of the washing water d is started to wash the alkali liquor in the resin column at a set time, then the condensed water b and the fresh water c are mixed to obtain the washing water d with the temperature of 40-60 ℃, the resin column is washed for a certain time, the washing water d enters the washing water barrel 4, and is pumped to the sodium carbonate evaporation process through the washing water d;
(3) regeneration: after the washing time is finished, acid elution is needed to be carried out on the well-washed boron ion exchange resin column A1, hydrochloric acid with proper concentration is injected into a boron elution liquid barrel 5, specifically, the acid washing time is set to start an acid washing pump, the acid washing is circulated, the concentration of the hydrochloric acid in the boron elution liquid is adjusted by starting a 35% hydrochloric acid i and a desalted water j when the concentration of the hydrochloric acid in the acid washing process is between 2% and 5%, the concentration of the hydrochloric acid in the boron elution liquid is adjusted by starting a hydrochloric acid metering pump when the concentration of the hydrochloric acid is lower than 2%, the acid washing liquid is circulated for about 5 times until the boron content is about 8g/l, the evaporation requirement is met, and the well-regenerated boron ion exchange resin column A1 is reserved; the boron ion exchange resin column which is washed by circularly pumping the eluent in the boron eluent barrel 5 into the washing pump is realized, on one hand, the purpose of eluting boron ions in the boron ion exchange resin column is realized, on the other hand, the enrichment of the boron ions in the eluent is realized, the effect of improving the concentration of the boron ions is improved, and the subsequent evaporation treatment is convenient.
In the embodiment, the boron ion exchange resin column is filled with LSC-800 chelate resin, the LSC-800 chelate resin is mainly boron specific coordination adsorption resin, and the functional group is mainly a meglumine group for selectively adsorbing boron; forming chelate with boric acid and borate in the feed liquid, and then intercepting and adsorbing by using the pore channel of the resin. The regenerant is mainly acid-base with a concentration of about 4%, which is resolved by hydrochloric acid to become H (hydrogen) type, and then 4% sodium hydroxide is converted into sodium type, because the natural alkali solution contains saturated sodium carbonate solution, the regenerant can replace sodium hydroxide to be directly converted into sodium type.
(4) Evaporation of boric acid: the high-concentration boric acid eluent is sent to the preheater 6 through a boric acid evaporation upper liquid pump to exchange heat with the evaporation condensate water b and then reaches the evaporator for evaporation and concentration, and steam generated by evaporation is compressed by the steam compressor 8 and then sequentially passes through the heat exchange side of the heat exchange evaporator and the preheater 6, so that the effect of saving a heat source can be achieved; the boric acid rich solution evaporated by the evaporator enters a cold separation tank 9, is stirred in the cold separation tank 9 for cold separation to 20 ℃, a large amount of boric acid crystals are separated out, and are separated by a centrifugal machine 10 and dried at 50 ℃ to obtain a boric acid product, wherein the quality of the boric acid product reaches the top grade; the centrifugal mother liquor enters a boric acid mother liquor barrel 11 and is conveyed to an evaporator by a boric acid mother liquor pump to be continuously evaporated.
In the adsorption, washing and regeneration processes, the opening and closing of a valve on a pipeline are controlled, so that the boron ion exchange resin column A1 and the boron ion exchange resin column B2 are subjected to adsorption-washing-regeneration circulation, and boron ion eluent with a certain concentration is obtained; evaporating, cold separating out, crystallizing and centrifuging the boron ion eluent to obtain boric acid solid h; the method not only realizes the removal of boron in the natural alkali liquor a and ensures the quality of subsequent products, but also can use the obtained boric acid as a glass manufacturing raw material, realizes the byproduct and utilization of boron and improves the utilization value of the natural alkali liquor a.
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 utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The utility model provides a system for boron is prepared to natural alkali lye is carried boron, its characterized in that, including boron ion exchange resin column, boron removal mother liquor bucket, wash cask, boron elution liquid bucket, evaporation unit, cryotank, centrifuge, boric acid mother liquor bucket, the feed inlet of boron ion exchange resin column respectively with natural alkali liquor pipe and water pipe intercommunication, the discharge gate of boron ion exchange resin column respectively with boron removal mother liquor bucket with wash cask intercommunication, the elution import of boron ion exchange resin column with the liquid outlet of boron elution liquid bucket passes through pickle liquor pipe intercommunication, the elution export of boron ion exchange resin column with the inlet of boron elution liquid bucket passes through the eluent pipe intercommunication, the liquid outlet of boron elution liquid bucket still with the import intercommunication of evaporation unit, the boric acid rich liquid export of evaporation unit with the import intercommunication of cryotank, the export of cryotank with the centrifuge intercommunication, and a liquid phase outlet of the centrifuge is communicated with an inlet of the boric acid mother liquor barrel, and an outlet of the boric acid mother liquor barrel is communicated with an inlet of the evaporation unit.
2. The system for preparing boric acid by extracting boron from natural alkali liquor according to claim 1, wherein the boron ion exchange resin column comprises a boron ion exchange resin column A and a boron ion exchange resin column B, feed inlets of the boron ion exchange resin column A and the boron ion exchange resin column B are respectively communicated with a natural alkali liquor pipe and a water pipe, and valves are respectively arranged on the natural alkali liquor pipe and the water pipe which are communicated with the boron ion exchange resin column A and the boron ion exchange resin column B; the discharge ports of the boron ion exchange resin column A and the boron ion exchange resin column B are both communicated with the boron removal mother liquor barrel and the flushing water barrel, and valves are arranged on pipelines communicated between the boron ion exchange resin column A and the boron removal mother liquor barrel as well as between the boron ion exchange resin column B and the flushing water barrel;
elution inlets of the boron ion exchange resin column A and the boron ion exchange resin column B are both communicated with the pickling solution pipe, and valves are arranged on pickling solution pipes communicated with the boron ion exchange resin column A and the boron ion exchange resin column B; the elution outlets of the boron ion exchange resin column A and the boron ion exchange resin column B are both communicated with the elution liquid pipe, and valves are arranged on the elution liquid pipes communicated with the boron ion exchange resin column A and the boron ion exchange resin column B.
3. The system for preparing boric acid by extracting boron from natural alkali liquor according to claim 1 or 2, wherein the evaporation unit comprises a steam pipe, a preheater and a forced circulation evaporator, wherein a cold medium inlet of the preheater is communicated with an outlet of the boron elution liquor tank, a cold medium outlet of the preheater is communicated with a feed inlet of the forced circulation evaporator, and a boric acid rich liquor outlet of the forced circulation evaporator is communicated with the cold precipitation tank; the steam pipe is communicated with a heating chamber steam inlet of the forced circulation evaporator, and a heating chamber steam outlet of the forced circulation evaporator is communicated with a heat medium inlet of the preheater.
4. The system for extracting boron from natural alkali liquor to prepare boric acid according to claim 3, wherein the evaporation unit further comprises a vapor compressor, an inlet of the vapor compressor is communicated with a vapor outlet of the forced circulation evaporator, and an outlet of the vapor compressor is communicated with a vapor inlet of a heating chamber of the forced circulation evaporator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122155223.3U CN215694059U (en) | 2021-09-07 | 2021-09-07 | System for preparing boric acid by extracting boron from natural alkali liquor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122155223.3U CN215694059U (en) | 2021-09-07 | 2021-09-07 | System for preparing boric acid by extracting boron from natural alkali liquor |
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| CN202122155223.3U Active CN215694059U (en) | 2021-09-07 | 2021-09-07 | System for preparing boric acid by extracting boron from natural alkali liquor |
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