CN102390845A - Method for producing salt special for sodium metal by using elutriation method - Google Patents
Method for producing salt special for sodium metal by using elutriation method Download PDFInfo
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- CN102390845A CN102390845A CN2011102262931A CN201110226293A CN102390845A CN 102390845 A CN102390845 A CN 102390845A CN 2011102262931 A CN2011102262931 A CN 2011102262931A CN 201110226293 A CN201110226293 A CN 201110226293A CN 102390845 A CN102390845 A CN 102390845A
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Abstract
The invention relates to a method for producing salt special for sodium metal by using an elutriation method and belongs to the field of salt chemical engineering. In the method, the salt special for the sodium metal is produced by using gypsum mould brine. The process flow comprises the following steps of: firstly, removing sulfate ions from part of the brine by adding 1 to 1.5 kg/m<3> of BaCl2 to obtain purified brine, and producing wet salt from the other part of the brine through a salt production line; secondly, elutriating the obtained wet salt by using the purified brine to remove the sulfate ions and thus obtaining the wet salt special for the sodium metal, wherein a proportion of the using amount of the purified brine for elutriating the SO4<2-> to the mass of the wet salt is 400 to 500 mL/100 g; and finally, drying and dehydrating the obtained wet salt special for the sodium metal to obtain the salt special for the sodium metal. The method is simple in process and low in production cost; and the sulfate ion content in the obtained salt special for the sodium metal is lower than 0.070 percent.
Description
Technical field
The present invention relates to a kind of production technique of Industrial Salt, particularly a kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method belongs to the salt chemical engineering field.
Background technology
A kind of special-purpose salt that sodium Metal 99.5 is used of producing is arranged in the Industrial Salt product, and it is when electrolysis NaCl is produced sodium Metal 99.5, to use as industrial raw material.SO in the NaCl product
4 2-Therefore the work-ing life and the production efficiency of ion content directly has influence on electrolysis NaCl when producing sodium Metal 99.5 electrode bar produce special-purpose salt that sodium Metal 99.5 uses to SO
4 2-Content requirement very high, generally below 0.070% (weight percent), other index not special it.This part market requirement share in whole Industrial Salt market is little, and it is too little to set up the production line scale separately, and it is very unfortunate again to give up this part market, and how low cost prodn sodium Metal 99.5 special-purpose salt never has good way.
At present, for the Salt Production enterprise of gypsum model bittern, produce of the restriction of sodium Metal 99.5 special-purpose salt, SO owing to processing condition
4 2-Content is higher, and is wayward.The composition of gypsum model bittern (g/L): NaCl309.4, CaSO
44.68, CaCl
21.01, MgCl
20.17, NH
+ 40.54.There is enterprise once to use and uses the method that reduces gypsum content in the jar at the production initial stage.
The production initial stage when producing the sodium Metal 99.5 special-purpose salt is reduced jar method of interior gypsum content, stops exactly the feed liquid of production system is replaced by new bittern fully, at this moment the SO of production system
4 2-Ion content, gypsum content are lower.At this time do not add gypsum seed, utilize SO in the production initial stage feed liquid
4 2-Ion content, the low sodium Metal 99.5 special-purpose salt of producing of gypsum content.But along with the carrying out that produces, the gypsum content of production system raises rapidly, and every batch of output has only 500～600 tons, and the gypsum content of production system enrichment is too high, can't produce qualified sodium Metal 99.5 special-purpose salt product.And owing to do not add gypsum seed, the production system fouling is very serious, and subsequently production is caused very big influence.
There is enterprise also once to use two alkali-BaCl
2Produce low SO behind the method purified brine
4 2-Content sodium Metal 99.5 special-purpose salt, this is a kind of method of bittern purifying, removes contained Ca in the bittern with chemical process exactly
2+, Mg
2+, SO
4 2-And other impurity, again in order to salt manufacturing.
In bittern, add NaOH, Na
2CO
3, make Ca
2+, Mg
2+Generate Mg (OH)
2, CaCO
3Deposition adds BaCl
2Make SO
4 2-Generate BaSO
4Deposition.This kind method is salt manufacturing all to be purified with bittern remove impurity, if be whole purified brines fully in order to produce the sodium Metal 99.5 special-purpose salt, because metal sodium salt demand is little, causes production cost too high, and there is no need.
Patent publication No. is CN1525941A; Name is called the method for preparing the high purity wet salt, the wet salt that can obtain thus and the purposes in electrolysis process thereof; The method of producing wet salt in this patent is in natural salt solution, to add to be selected from oligopeptides, polypeptide and to have two or more hydroxy-acid groups or crystal growth inhibitor that alkyl-carboxylic acid and optional has a polymkeric substance of phosphate radical, phosphonate radical, phosphino-, sulfate radical and/or sulfonate radical has the salt crystal of special crystal face with formation, and crystallization and evaporation obtains wet salt then.The method of this production wet salt to operational requirement than higher, and complex process.
Also have some producers to adopt other method purified brines to obtain qualified Special Metal product salt, but it purifies cost generally about 25 yuan/ton, it is more to increase cost, also is not suitable for the production of sodium Metal 99.5 special-purpose salt.
Summary of the invention
In order to overcome the above problems, the present invention has studied a kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method.In order to realize that cost degradation produces qualified sodium Metal 99.5 special-purpose salt with gypsum model bittern with elutriation method,, sought out a kind of method of under the situation of few investment as far as possible, producing the sodium Metal 99.5 special-purpose salt product that meets the demands through a large amount of experiments.
Technical scheme of the present invention is achieved in that
A kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method, the raw material of producing the sodium Metal 99.5 special-purpose salt is a gypsum model bittern, this method may further comprise the steps:
The first step: a part of gypsum model bittern in the former halogen pond is transported to reaction container, in reaction container, add can with SO
4 2-Reaction generates stable throw out, and does not need the compound of complicated reaction conditions, is purified bittern; Another part gypsum model bittern in the former halogen pond is transported to the Salt Production line, obtains wet salt;
Second step: the purified brine that obtains in the first step is transported to the wet salt that obtains with the processing of Salt Production line in the elutriation bucket after mixing, eluriating, obtains producing special-purpose wet salt of sodium Metal 99.5 and bittern mother liquor; The bittern mother liquor is back to reaction container and recycles; Reaction container utilizes the blowdown of production intermittent periodic, to discharge throw out;
The 3rd goes on foot: the special-purpose wet salt of the production sodium Metal 99.5 that obtains in second step is transported to dehydrates operation, be made as and produce the sodium Metal 99.5 special-purpose salt, be finished product salt.
Further, the interpolation in the described the first step can with SO
4 2-Reaction generates the stable throw out of matter, and the addition of compound that does not need complicated reaction conditions is according to SO in the bittern
4 2-Content confirm, to remove SO in the bittern fully
4 2-Be index.
Further: the interpolation in the described the first step can with SO
4 2-Reaction generates the stable throw out of matter, and not needing the compound of complicated reaction conditions is BaCl
2
Further, described BaCl
2Raw material is added directly in the gypsum model bittern of the needs purification in the reaction container, and addition is 1kg ~ 1.5kg BaCl
2∕ m
3Gypsum model bittern.
The water cut of the wet salt that further, obtains in the described the first step is 2.0% ~ 2.7%.
Further, describedly be used for SO in the wash-out wet salt
4 2-The consumption and the wet salt mass ratio of purified brine be 400mL～500 mL Jing Lu ∕ 100g wet salts.
Further, describedly be used for SO in the wash-out wet salt
4 2-The consumption and the wet salt mass ratio of purified brine be 400mL Jingization Lu Shui ∕ 100g wet salt.
Research of the present invention is according to being:
1, inspired by the principle of the residual washing liquid of washing machine rinsing garment surface, promptly earlier fall a large amount of washing liquids to the clothes centrifuge dripping that contains washing liquid, use the clear water rinsing to the clothes that contains a small amount of washing liquid again, soon can rinsing clean.The method that we eluriate is washed the Industrial Salt that common Salt Production explained hereafter is come out off, the SO that flush away salt particle surface attaches
4 2-Deng impurity, reach and reduce SO
4 2-Content improves the purpose of purity.
2, eluriate the selection of liquid:
At first, we expect the simplest material: clear water.Salt is very easily water-soluble solid, eluriates salt with clear water, though effect is preferably arranged, salt is soluble in water, can dissolve quite a few salt in the elutriation process, loses bigger.
We expect that eluriating meeting with gypsum model bittern reduces the salt that dissolves, and then reduce loss for fear of the dissolving of salt.Gypsum model bittern is except the advantage that has reserves and enrich, be convenient to draw materials; Eluriating salt with gypsum model bittern is because the content of salt is near saturated in the gypsum model bittern; Salt can be dissolved in the higher gypsum model bittern of NaCl content hardly, so salt loss can be ignored, and the gypsum model bittern that is used for eluriating salt can recycle; Save the energy, cut down expenses.Eluriate wet salt with gypsum model bittern and can or can not remove the SO in the wet salt
4 2-, through experiment, we find that eluriating wet salt with gypsum model bittern removes SO
4 2-Effect and not obvious, analyze its reason, SO in the gypsum model bittern
4 2-Content is sufficient, has reached metastable state, can not eluriate the SO in the wet salt basically
4 2-
So adopting, we remove SO
4 2-Gypsum model bittern eluriate salt, with not containing SO
4 2-Purified brine can the sulfate ion in the salt be diluted, and then obtain SO
4 2-The salt that content is lower, and then reach final purpose.
3, the SO in the removal gypsum model bittern
4 2-
As everyone knows, can be with removing SO
4 2-Material a lot, with Ba
2+For best, SO
4 2-With Ba
2+In conjunction with being easier to, very easily generate the BaSO of stable in properties
4, without any need for the reaction conditions of complicacy, and BaSO
4Be highly stable deposition, be easy to separate, so adopt BaCl
2Remove SO
4 2-It is optimal selection.
We are employed in the gypsum model bittern and add BaCl
2Remove SO
4 2-Method, make to eluriate and to use purified brine.
4, elutriation is confirmed with the consumption of purified brine
The consumption of eluriating with purified brine is a key factor, effect that its decision is eluriated and production cost etc.We have carried out test to confirm to eluriate the optimum amount with purified brine.
Below, measure its various component contents: the results are shown in Table 1 through randomly drawing wet salt salt appearance.
Accurate weighing 100g wet salt has been removed SO with 100mL, 200 mL, 300 mL, 400 mL, 500 mL, 600 mL, 700 mL, 800 mL, 900 mL, 1000 mL respectively
4 2-Purified brine eluriate, and then can remove contained SO in the wet salt
4 2-, after fully eluriating, suction filtration dries, and obtains removing part SO
4 2-Wet salt, measure its content and see the following form 2.
We can find out through above-mentioned data, when the purified brine consumption is 400mL, and SO
4 2-Content just can reach the level below 0.070%, and continue to increase the consumption of purified brine, eluriate effect and do not significantly improve.If expect SO
4 2-The wet salt that content is lower, need strengthen the consumption of purified brine, and increase is bigger relatively for cost like this, so we draw the conclusion of this experiment: when the ratio of wet salt quality and bittern consumption is 100g Shi Yan ∕ 400mL bittern, reach optimum reaction condition.
Owing to testing data certain error is arranged certainly in producing, thus in producing we to select the purified brine usage ratio be that 1 ton of salt is used purified brine 4m
3~ 5m
3, this condition is the top condition of production.
Beneficial effect of the present invention:
(1) a kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method of the present invention is utilized general salt production line, through simply transforming, just can produce, and need not set up new production line, and facility investment is few.
(2) technical process is simple, and is easy to operate, and treating processes only need add the Powdered BaCl of getting
2, agitation and filtration gets final product, so flow process is very simple, easy to operate.Gypsum model bittern is except the advantage that has reserves and enrich, be convenient to draw materials; Eluriating salt with gypsum model bittern is because the content of salt is near saturated in the gypsum model bittern; Salt can be dissolved in the higher gypsum model bittern of NaCl content hardly, so salt loss can be ignored, and the gypsum model bittern that is used for eluriating salt can recycle; Save the energy, cut down expenses.
(3) treatment effect is good, through the processing of this method to sulfate ion in bittern or the industrial brine, the content of sulfate ion is reduced more than ninety percent, and sulfate ion content is lower than 0.070% in the sodium Metal 99.5 special-purpose salt that obtains.
Description of drawings:
Fig. 1 technological process of production figure of the present invention
.
Embodiment:
Below in conjunction with technological process of production figure and production embodiment the present invention is done further detailed description.
Gypsum model bittern part in the former halogen pond is transported to reaction container, under the normal temperature and pressure with Powdered industrial BaCl
2Raw material is added directly in the gypsum model bittern that needs to purify, and addition is 1kg ~ 1.5kg BaCl
2∕ m
3Gypsum model bittern is removed the SO in the gypsum model bittern
4 2-Be purified bittern.Most of gypsum model bittern is transported to the Salt Production line, obtains wet salt, and wet salt must get water cut 2.0% ~ 2.7%.The purified brine that obtains is transported to the wet salt that obtains with the processing of Salt Production line in the elutriation bucket mixes, eluriate, obtain producing special-purpose wet salt of sodium Metal 99.5 and bittern mother liquor.Purified brine is used purified brine 4m with the ratio of producing the special-purpose wet salt of sodium Metal 99.5 according to the special-purpose wet salt of 1 ton of sodium Metal 99.5
3~ 5m
3Control.The special-purpose wet salt of the sodium Metal 99.5 that obtains is transported to and dehydrates operation, dehydrates, and obtains finished product salt, and the bittern mother liquor in the elutriation bucket is back to reaction container and recycles.Reaction container utilizes the blowdown of production intermittent periodic, to discharge sedimentary BaSO
4
We on June 16th, 2011 8:00 to 18:00 the sodium Metal 99.5 special-purpose salt of producing is carried out sampling Detection, produce 216 tons of sodium Metal 99.5 special-purpose salts between detection period altogether, add BaCl
21.2 ton, two 50m
3∕ h purified brine transferpump standard-sized sheet is carried altogether and is eluriated with about 900 m of purified brine
3~ 1000 m
3The about BaCl of average ton salt consumption
25.6kg, consume and eluriate with purified brine 4.6 m
3
In different time the product of producing is carried out sampling Detection, data are seen table 3.
Result by table 3 can find out, the SO in the sodium Metal 99.5 special-purpose salt of production
4 2-Content about 0.065, meet sodium Metal 99.5 special-purpose salt SO
4 2-The standard of content below 0.070% (weight percent).
Be noted that at last a kind of method with elutriation method production sodium Metal 99.5 special-purpose salt of the present invention not only is fit to gypsum model bittern and produces the sodium Metal 99.5 special-purpose salt, and be fit to other bittern to remove SO
4 2-For purpose is produced the sodium Metal 99.5 special-purpose salt; Other modification that is equal to replacement or makes of affiliated technical field those of ordinary skill according to prior art; As long as do not exceed the thinking and the scope of technical scheme of the present invention, all should be included within the interest field of the presently claimed invention.
Claims (7)
1. method of producing the sodium Metal 99.5 special-purpose salt with elutriation method, the raw material of producing the sodium Metal 99.5 special-purpose salt is a gypsum model bittern, it is characterized in that: this method may further comprise the steps:
The first step: a part of gypsum model bittern in the former halogen pond is transported to reaction container, in reaction container, add can with SO
4 2-Reaction generates stable throw out, and does not need the compound of complicated reaction conditions, is purified bittern; Another part gypsum model bittern in the former halogen pond is transported to the Salt Production line, obtains wet salt;
Second step: the purified brine that obtains in the first step is transported to the wet salt that obtains with the processing of Salt Production line in the elutriation bucket after mixing, eluriating, obtains producing special-purpose wet salt of sodium Metal 99.5 and bittern mother liquor; The bittern mother liquor is back to reaction container and recycles; Reaction container utilizes the blowdown of production intermittent periodic, to discharge throw out;
The 3rd goes on foot: the special-purpose wet salt of the production sodium Metal 99.5 that obtains in second step is transported to dehydrates operation, be made as and produce the sodium Metal 99.5 special-purpose salt, be finished product salt.
2. a kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method according to claim 1 is characterized in that: the interpolation in the described the first step can with SO
4 2-Reaction generates the stable throw out of matter, and the addition of compound that does not need complicated reaction conditions is according to SO in the bittern
4 2-Content confirm, to remove SO in the bittern fully
4 2-Be index.
3. a kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method according to claim 1 is characterized in that: the interpolation in the described the first step can with SO
4 2-Reaction generates the stable throw out of matter, and not needing the compound of complicated reaction conditions is BaCl
2
4. a kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method according to claim 1 is characterized in that: described BaCl
2Raw material is added directly in the gypsum model bittern of the needs purification in the reaction container, and addition is 1kg ~ 1.5kg BaCl
2∕ m
3Gypsum model bittern.
5. a kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method according to claim 1, it is characterized in that: the water cut of the wet salt that obtains in the described the first step is 2.0% ~ 2.7%.
6. a kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method according to claim 1 is characterized in that: describedly be used for SO in the wash-out wet salt
4 2-The consumption and the wet salt mass ratio of purified brine be 400mL～500 mL Jing Lu ∕ 100g wet salts.
7. a kind of method of producing the sodium Metal 99.5 special-purpose salt with elutriation method according to claim 1 is characterized in that: describedly be used for SO in the wash-out wet salt
4 2-The consumption and the wet salt mass ratio of purified brine be 400mL Jingization Lu Shui ∕ 100g wet salt.
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Cited By (3)
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| CN104891531A (en) * | 2015-05-13 | 2015-09-09 | 中盐舞阳盐化有限公司 | Preparation method of metal sodium salt |
| CN106241836A (en) * | 2016-07-29 | 2016-12-21 | 中盐金坛盐化有限责任公司 | A kind of energy-saving metal sodium salt and its preparation method and application |
| CN106343515A (en) * | 2016-08-22 | 2017-01-25 | 自贡市轻工业设计研究院有限责任公司 | Method for producing natural high calcium salt by calcium type brine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104891531A (en) * | 2015-05-13 | 2015-09-09 | 中盐舞阳盐化有限公司 | Preparation method of metal sodium salt |
| CN104891531B (en) * | 2015-05-13 | 2017-03-01 | 中盐舞阳盐化有限公司 | A kind of preparation method of metal sodium salt |
| CN106241836A (en) * | 2016-07-29 | 2016-12-21 | 中盐金坛盐化有限责任公司 | A kind of energy-saving metal sodium salt and its preparation method and application |
| CN106343515A (en) * | 2016-08-22 | 2017-01-25 | 自贡市轻工业设计研究院有限责任公司 | Method for producing natural high calcium salt by calcium type brine |
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Application publication date: 20120328 |