CN215711826U - System for iron hydroxide is prepared to natural alkali lye deironing - Google Patents
System for iron hydroxide is prepared to natural alkali lye deironing Download PDFInfo
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- CN215711826U CN215711826U CN202122156016.XU CN202122156016U CN215711826U CN 215711826 U CN215711826 U CN 215711826U CN 202122156016 U CN202122156016 U CN 202122156016U CN 215711826 U CN215711826 U CN 215711826U
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Abstract
The utility model discloses a system for preparing ferric hydroxide by removing iron from natural alkali liquor, which comprises an iron ion exchange resin column, an iron removal mother liquor barrel, an acid washing liquor barrel, an iron elution liquor barrel, a washing water barrel, a neutralization tank, an alkali liquor storage tank and a filter press. According to the scheme, the iron ion exchange resin tower is arranged, and the iron ion exchange resin adsorbs iron ions in the natural alkali liquor, so that the iron content in the 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; according to the scheme, the iron-containing solution with high concentration is obtained by desorbing and adsorbing saturated ion exchange resin with hydrochloric acid, the iron-containing solution is neutralized by adopting soda ash carbonization mother liquor for making alkali to obtain ferric hydroxide precipitate, an available ferric hydroxide product is obtained by flocculation precipitation and filter press separation, and the obtained ferric hydroxide solid can be used as an iron-making raw material for resource utilization, and the environment is not damaged.
Description
The technical field is as follows:
the utility model relates to a system for preparing ferric hydroxide, in particular to a system for preparing ferric hydroxide by removing iron 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 impurity elements such as boron, iron and the like, the iron and boron contents of the alkali liquor are accumulated and increased due to evaporation and concentration of feed liquid in the process of producing the soda, in addition, equipment corrosion is also the main reason for increasing the iron content in the alkali liquor, the natural alkali liquor contains a large amount of sodium bicarbonate, iron ions mainly exist in a divalent form, and the solubility of divalent iron is higher, so the iron content in the alkali-making mother liquor reaches 60mg/l, the iron contents in the calcined soda and the baking soda products are higher, the high-quality product rate is reduced, and certain influence is caused on the product quality.
The utility model has the following contents:
in order to solve the technical problems, the utility model aims to provide a system for preparing iron hydroxide by removing iron from natural alkali liquor.
The utility model is implemented by the following technical scheme: a system for preparing ferric hydroxide by removing iron from natural alkali liquor comprises an iron ion exchange resin column, an iron removal mother liquor barrel, an acid washing liquor barrel, an iron elution liquor barrel, a washing water barrel, a neutralization tank, an alkali liquor storage tank and a filter press, the feed inlet of the ion exchange resin column is respectively communicated with a natural alkali liquor pipe and a water pipe, the discharge outlet of the iron ion exchange resin column is respectively communicated with the inlet of the iron removing mother liquor barrel and a washing water barrel, the elution inlet of the iron ion exchange resin column is communicated with an acid washing liquid barrel, the elution outlet of the iron ion exchange resin column is communicated with the inlet of the iron eluent barrel through an elution liquid pipe, the outlet of the iron elution liquid barrel is communicated with the inlet of the neutralization tank, the inlet of the neutralization tank is also communicated with a flocculating agent storage tank and an alkali liquor storage tank, the outlet of the neutralization tank is communicated with the inlet of the filter press, and the liquid outlet of the filter press is communicated with a neutralization mother liquid barrel.
Further, the iron ion exchange resin column comprises an iron ion exchange resin column A and an iron ion exchange resin column B, feed inlets of the iron ion exchange resin column A and the iron 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 iron ion exchange resin column A and the iron ion exchange resin column B; the discharge ports of the iron ion exchange resin column A and the iron ion exchange resin column B are both communicated with the inlet of the iron-removing mother liquid barrel and the flushing water barrel, and valves are arranged on pipelines communicated between the iron ion exchange resin column A and the iron-removing mother liquid barrel as well as between the iron ion exchange resin column B and the flushing water barrel;
the elution inlets of the iron ion exchange resin column A and the iron ion exchange resin column B are both communicated with the pickling solution barrel, and valves are arranged on pipelines communicated with the iron ion exchange resin column A, the iron ion exchange resin column B and the pickling solution barrel; the elution outlets of the iron ion exchange resin column A and the iron ion exchange resin column B are communicated with the elution liquid pipe, and a valve is arranged on the elution liquid pipe.
Further, it still includes carbonators and baking soda filtration separator, the import of carbonators respectively with deironing mother liquor bucket and carbon dioxide pipe intercommunication, the export of carbonators with baking soda filtration separator import intercommunication, baking soda filtration separator's liquid outlet with alkali lye storage tank intercommunication.
The utility model has the advantages that:
1. according to the scheme, the iron ion exchange resin tower is arranged, and the iron ion exchange resin adsorbs iron ions in the natural alkali liquor, so that the iron content in the 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 saturated ion exchange resin is desorbed and adsorbed by hydrochloric acid to obtain a high-concentration iron-containing solution, the iron-containing solution is neutralized by using soda ash carbonization mother liquor for making alkali to obtain iron hydroxide precipitate, and an available iron hydroxide product is obtained by flocculation precipitation and filter press separation, so that the obtained iron hydroxide solid can be used as an iron-making raw material for resource utilization, and the environment is not damaged; the neutralized mother liquor is sent to the mother liquor treatment process, and can be reused after evaporation and concentration.
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 producing iron hydroxide by removing iron from a natural lye in this embodiment.
In the figure: the iron ion exchange resin column A1, the iron ion exchange resin column B2, an iron-removing mother liquor barrel 3, an acid washing liquor barrel 4, an iron elution liquor barrel 5, a neutralization tank 6, an alkali liquor storage tank 7, a filter press 8, a carbonization tower 9, a sodium bicarbonate filtering and separating device 10, a natural alkali liquor pipe 11, a water pipe 12, an elution liquid pipe 13, a washing water barrel 14, a flocculating agent storage tank 15, a carbon dioxide pipe 16 and a neutralization mother liquor barrel 17.
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 iron hydroxide by removing iron from natural alkali liquor comprises an iron ion exchange resin column a1, an iron ion exchange resin column B2, an iron removal mother liquor barrel 3, an acid wash liquor barrel 4, an iron elution liquor barrel 5, a neutralization tank 6, an alkali liquor storage tank 7, a filter press 8, a carbonization tower 9 and a baking soda filtering and separating device 10, wherein feed inlets of the iron ion exchange resin column a1 and the iron ion exchange resin column B2 are both communicated with a natural alkali liquor pipe 11 and a water pipe 12, and valves are arranged on the natural alkali liquor pipe 11 and the water pipe 12 which are communicated with the iron ion exchange resin column a1 and the iron ion exchange resin column B2; the discharge ports of the iron ion exchange resin column A1 and the iron ion exchange resin column B2 are communicated with the inlet of the iron-removing mother liquor barrel 3 and the washing water barrel 14, and valves are arranged on pipelines communicated with the iron ion exchange resin column A1, the iron-removing mother liquor barrel 3 and the washing water barrel 14 and pipelines communicated with the iron ion exchange resin column B2, the iron-removing mother liquor barrel 3 and the washing water barrel 14;
elution inlets of the iron ion exchange resin column A1 and the iron ion exchange resin column B2 are both communicated with the pickling solution barrel 4, and valves are arranged on pipelines communicated with the iron ion exchange resin column A1 and the iron ion exchange resin column B2 with the pickling solution barrel 4; the elution outlets of the iron ion exchange resin column A1 and the iron ion exchange resin column B2 are communicated with the inlet of the iron elution liquid barrel 5 through an elution liquid pipe 13, and a valve is arranged on the elution liquid pipe 13.
The outlet of the iron eluent barrel 5 is communicated with the inlet of the neutralization tank 6, the inlet of the neutralization tank 6 is also communicated with a flocculating agent storage tank 15 and an alkali liquor storage tank 7, the outlet of the neutralization tank 6 is communicated with the inlet of the filter press 8, and the liquid outlet of the filter press 8 is communicated with a neutralization mother liquor barrel 17.
The inlet of the carbonization tower 9 is respectively communicated with the iron removal mother liquor barrel 3 and the carbon dioxide pipe 16, the outlet of the carbonization tower 9 is communicated with the inlet of the sodium bicarbonate filtering and separating device 10, and the liquid outlet of the sodium bicarbonate filtering and separating device 10 is communicated with the alkali liquor storage tank 7.
The working principle is as follows:
as shown in fig. 1, the material comprises: the method comprises the following steps of natural alkali liquor a, condensed water b, fresh water c, washing water d, a flocculating agent e, carbonization mother liquor f, iron hydroxide g, 35% hydrochloric acid h, desalted water i and neutralization mother liquor 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 iron content is about 60mg/l, the temperature is 30-60 ℃, the natural alkali liquor is sent to an iron ion exchange resin column A1, the natural alkali liquor with low iron content is obtained after ion exchange, wherein the sodium carbonate content is about 320g/l, the iron content is less than 6mg/l, the iron removal rate is more than 90%, the natural alkali liquor with low iron content enters an iron removal mother liquor barrel 3, and the natural alkali liquor with low iron content is pumped into a carbonization tower 9 of a carbonization process through an iron removal mother liquor for carbonization;
in the embodiment, the iron ion exchange resin column is filled with LSC-500 aminophosphonic acid chelating resin, and the LSC-500 aminophosphonic acid chelating resin is macroporous chelating resin which is formed by crosslinking styrene and divinylbenzene and has weak acidic aminophosphonic acid active groups, and the chemical structure is favorable for forming a chelate with iron ions.
(2) Washing: after the iron ion exchange resin column A1 with the set adsorption time is saturated with adsorbed iron, the column B2 needs to be switched to continue adsorbing iron in the natural alkali liquor, and the saturated iron ion exchange resin column A1 needs to be washed and regenerated. The specific operation is that the time is set, firstly, a washing water pump is started to flush alkali liquor in the iron ion exchange resin column A1 with washing water, then evaporation condensate water and fresh water are mixed to obtain washing water with the temperature of about 40-60 ℃, the iron ion exchange resin column A1 is washed for a certain time, the washing water enters a washing water barrel 14 and is pumped to a soda evaporation process through the washing water;
(3) regeneration: after the washing time is finished, the washed iron ion exchange resin column A1 needs to be subjected to acid elution, specifically, the acid washing time is set to start an acid washing pump, the acid washing is circulated, the concentration of hydrochloric acid in the acid washing process is between 2 and 5 percent and when the concentration of the hydrochloric acid is lower than 2 percent, an eluent with a certain hydrochloric acid concentration is prepared by a hydrochloric acid metering pump and desalted water, the acid washing eluent flows through the iron ion exchange resin column A1 at the flow rate of 2 to 4BV/h, the total amount is controlled to be 2 to 4BV (BV is the total volume of the resin), the eluent enters an iron washing eluent barrel 5, and the regenerated iron ion exchange resin column A1 is reserved;
(4) neutralizing: and (3) pumping the high-concentration iron eluent to a neutralization tank 6 through a neutralization upper liquor pump to perform neutralization reaction with sodium bicarbonate mother liquor obtained through carbonization treatment and filtration separation to obtain ferric hydroxide precipitate, stirring, adding a flocculating agent to precipitate, aggregating through a filter press 8 to obtain ferric hydroxide solid, overflowing the supernatant of the neutralization tank 6 to a neutralization mother liquor barrel 17, and allowing the mother liquor of the filter press 8 to enter the neutralization mother liquor barrel 17. The neutralized mother liquor is pumped to a mother liquor evaporation process through a neutralized mother liquor pump.
During the adsorption, washing and regeneration processes, the opening and closing of a valve on a pipeline are controlled, so that the material trend is controlled; finally, after neutralization and filter pressing, the ferric hydroxide solid is obtained, so that the removal of iron in the natural alkali liquor is realized, the quality of subsequent products is ensured, the obtained ferric hydroxide can be used as an iron-making raw material, the by-product and utilization of iron are realized, and the utilization value of the natural alkali liquor is improved.
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 (3)
1. A system for preparing ferric hydroxide by removing iron from natural alkali liquor is characterized by comprising an iron ion exchange resin column, an iron removal mother liquor barrel, an acid washing liquor barrel, an iron elution liquor barrel, a washing water barrel, a neutralization tank, an alkali liquor storage tank and a filter press, the feed inlet of the ion exchange resin column is respectively communicated with a natural alkali liquor pipe and a water pipe, the discharge outlet of the iron ion exchange resin column is respectively communicated with the inlet of the iron removing mother liquor barrel and a washing water barrel, the elution inlet of the iron ion exchange resin column is communicated with an acid washing liquid barrel, the elution outlet of the iron ion exchange resin column is communicated with the inlet of the iron eluent barrel through an elution liquid pipe, the outlet of the iron elution liquid barrel is communicated with the inlet of the neutralization tank, the inlet of the neutralization tank is also communicated with a flocculating agent storage tank and an alkali liquor storage tank, the outlet of the neutralization tank is communicated with the inlet of the filter press, and the liquid outlet of the filter press is communicated with a neutralization mother liquid barrel.
2. The system for preparing ferric hydroxide by removing iron from natural alkali according to claim 1, wherein the iron ion exchange resin column comprises an iron ion exchange resin column A and an iron ion exchange resin column B, feed inlets of the iron ion exchange resin column A and the iron ion exchange resin column B are both communicated with a natural alkali liquid pipe and a water pipe, and valves are arranged on the natural alkali liquid pipe and the water pipe which are communicated with the iron ion exchange resin column A and the iron ion exchange resin column B; the discharge ports of the iron ion exchange resin column A and the iron ion exchange resin column B are both communicated with the inlet of the iron-removing mother liquid barrel and the flushing water barrel, and valves are arranged on pipelines communicated between the iron ion exchange resin column A and the iron-removing mother liquid barrel as well as between the iron ion exchange resin column B and the flushing water barrel;
the elution inlets of the iron ion exchange resin column A and the iron ion exchange resin column B are both communicated with the pickling solution barrel, and valves are arranged on pipelines communicated with the iron ion exchange resin column A, the iron ion exchange resin column B and the pickling solution barrel; the elution outlets of the iron ion exchange resin column A and the iron ion exchange resin column B are communicated with the elution liquid pipe, and a valve is arranged on the elution liquid pipe.
3. The system for preparing iron hydroxide by removing iron from natural lye according to claim 1 or 2, characterized in that it further comprises a carbonization tower and a baking soda filtering and separating device, wherein the inlet of the carbonization tower is respectively communicated with the iron-removing mother liquor barrel and the carbon dioxide pipe, the outlet of the carbonization tower is communicated with the inlet of the baking soda filtering and separating device, and the outlet of the baking soda filtering and separating device is communicated with the lye storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122156016.XU CN215711826U (en) | 2021-09-07 | 2021-09-07 | System for iron hydroxide is prepared to natural alkali lye deironing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122156016.XU CN215711826U (en) | 2021-09-07 | 2021-09-07 | System for iron hydroxide is prepared to natural alkali lye deironing |
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| Publication Number | Publication Date |
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| CN215711826U true CN215711826U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122156016.XU Active CN215711826U (en) | 2021-09-07 | 2021-09-07 | System for iron hydroxide is prepared to natural alkali lye deironing |
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- 2021-09-07 CN CN202122156016.XU patent/CN215711826U/en active Active
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