CN101391782B - Method for simultaneously producing two different content industry anhydrous sodium sulfate - Google Patents

Abstract

A production method for simultaneously obtaining industrial anhydrous sodium sulfate with two different contents is disclosed; the higher content is that the content of Na2SO4 is over 99.0 percent; the lower content is that the content of Na2SO4 is 70.0 percent to 90.0 percent; the production method is characterized in that products with two different contents are simultaneously obtained on the same production flow line, namely, a first effect evaporation can and a second effect evaporation can produce higher content industrial anhydrous sodium sulfate and a third effect evaporation can produce lower content industrial anhydrous sodium sulfate. Refined nitramine water which comes from mining areas and undertakes nitramine water purification process treatment is used raw material. The higher content industrial anhydrous sodium sulfate which is produced by the first effect evaporation can and the second effect evaporation can together and the lower content industrial anhydrous sodium sulfate which is produced by the third effect evaporation can respectively enter two sets of centrifugal dewatering, drying, and sieving systems, and then undertake packaging so as to respectively obtain the products with two different contents; the production operates continuously and stably, the heat loss is less, the steam and electricity achieve balance, and the waste of effective production time is reduced.

Description

A kind of industrial anhydrous sodium sulfate production method that obtains two kinds of different contents simultaneously

[technical field] the present invention is a kind of industrial anhydrous sodium sulfate production method that obtains two kinds of different contents simultaneously, belongs to chemical technology field.

[background technology] so-called high-load industrial anhydrous sodium sulfate is Na ₂SO ₄Content is more than 99.0%, in the system nitre industry generally with content height and particle thin and uniformly industrial anhydrous sodium sulfate be called Sodium sulfate anhydrous.min(99), it is the important source material of industries such as washing industry, glass product, leather printing and dyeing; Low levels is a kind of Na ₂SO ₄Content has only 70.0～90.0% general industry anhydrous sodium sulphate, can be applicable to the not high industry of some sodium sulfate purity requirements as bleachinging and dyeing aspects such as industry, materials for wall.These two kinds of products all were independent production in the past, can not obtain simultaneously on same production line.High-load industrial anhydrous sodium sulfate is to adopt five to imitate external heating type pump circulation vacuum-evaporation production technique, and raw material adopts the smart glass gall that purifies (removing impurity such as calcium, magnesium) from the minery through the glass gall treatment process.Smart glass gall enters five and imitates vacuum vaporation system, the used heating steam of vapo(u)rization system is the low-pressure saturated steam from water-tube boiler, through pervaporation, concentrate, be discharged in the nitre slurry bucket after the crystallization, again through centrifuge dehydration, drying, sieve, be packaged to be high-load industrial anhydrous sodium sulfate; In producing high-load industrial anhydrous sodium sulfate process, when acquiring a certain degree, NaCl concentration in the evaporating pot (must discharging store to open-air mother liquor pond after 80～90g/l), can guarantee that so just the product of producing had both met the requirement of GB/T6009-2003 national standard I class product, satisfy customer requirements again, i.e. product Na ₂SO ₄Content more than 99.0%, the content of NaCl is below 0.35%, otherwise quality product will be affected.The production of low levels industrial anhydrous sodium sulfate is the smart glass gall through the purification of glass gall treatment process that must stop using the mining area conveying to come after mother liquor storage in the open-air mother liquor pond is full, directly use and contain the higher mother liquor of NaCl in the open-air mother liquor pond, its production technique is identical with the high-load industrial anhydrous sodium sulfate mode of production with mode, the product of producing also meets the requirement of GB/T6009-2003 national standard III class product and special user's needs are asked its Na ₂SO ₄Content is lower, generally has only 70.0～90.0%.Therefore can only be that high-content and low levels industrial anhydrous sodium sulfate are alternately produced reciprocation cycle on a production line.This method of alternately producing two kinds of products on a production line has following defective:

1. energy loss is big, when producing high-load industrial anhydrous sodium sulfate product, must discharge a part and contain the higher mother liquor of NaCl after being concentrated, the mother liquor exhaust temperature is at 80～90 ℃, the higher mother liquor of these temperature need be stored for some time, its temperature can cool down naturally, until envrionment temperature, the energy of such production cycle loss is very big, the energy through estimation loss every day is amounted to into the about 3.7t of mark coal, about 40 days of each production cycle, the energy of each production cycle loss is amounted to into the nearly 150t of mark coal.

2. production control is difficult, raw materials used smart glass gall during one side manufacture anhydrous sodium sulphate through glass gall treatment process purification (removing impurity such as calcium, magnesium) for the minery, the waste water that production is produced enters wastewater disposal basin and can reach balance after high pressure centrifugal pump is conveyed in the disused well, and do not need the glass gall in minery when producing the low levels industrial anhydrous sodium sulfate, producing the waste water that is produced can not efflux, otherwise pollute the environment, can not be conveyed in the disused well, can only temporary storage in basin, but reserves are limited in the basin, therefore are difficult to control; On the low side when output is produced high-load industrial anhydrous sodium sulfate when producing the industrial anhydrous sodium sulfate of low levels in addition, cause the vapour electricity uneven, need an emptying part to give birth to steam, waste a large amount of energy, also cause sound pollution simultaneously.On the other hand, the industrial anhydrous sodium sulfate production of low levels finishes when being transformed into high-load industrial anhydrous sodium sulfate and producing, must discharge the residue mother liquor in the evaporating pot earlier, rinse jar with plain boiled water again, rinsing jar water can not efflux, must be recovered into wastewater disposal basin, add smart glass gall then again and produce, the waste effective production time.

3. the corrosion of equipment is strengthened because NaCl content is higher in the industrial anhydrous sodium sulfate of low levels, and original design be to aim to produce high-load industrial anhydrous sodium sulfate and design, so only consider to be suitable for Na during the equipment material type selecting ₂SO ₄The material of producing and do not consider also to be suitable for simultaneously the material of NaCl.

[summary of the invention] is in order to overcome above-mentioned defective when alternately producing two kinds of products on same production line, the invention provides the production method that the industrial anhydrous sodium sulfate production method that obtains two kinds of different contents on same the production line simultaneously promptly obtains high-content (Na2SO4 content is more than 99.0%) and two kinds of products of low levels (Na2SO4 content is 70.0%～90.0%) industrial anhydrous sodium sulfate simultaneously, to reduce the energy and the wasting of resources, boost productivity.

For solving its technical problem, the technical solution used in the present invention is: utilize existing five to imitate external heating type pump circulation vacuum-evaporation production line, elder generation extracts former glass gall from mine, handle through glass gall to become impurity smart glass gall seldom; With pump smart glass gall is delivered to the 5th again and imitates the evaporating pot evaporation, change the evaporation of quadruple effect evaporating pot again over to, smart glass gall after will concentrating with pump then is delivered to first and second and imitates evaporating pot, nitre slurry bucket sent into by the material that crystallizes out after centrifuge dehydration, dry screening, quantitative package become high-load industrial anhydrous sodium sulfate, after put in storage as finished product after the assay was approved; After first and second mother liquor of imitating the evaporating pot generation is handled in mother vat simultaneously, with evaporation concentration in pump delivery to the triple effect evaporator, the material that crystallizes out is sent into another nitre slurry bucket, then through centrifuge dehydration, dry screening, quantitative package becomes the industrial anhydrous sodium sulfate finished product of low levels, after the most after the assay was approved, puts in storage as finished product.

The present invention compared with prior art has following beneficial effect:

1. because production method of the present invention is still to adopt five of existing manufacture anhydrous sodium sulphate to imitate external heating type pump circulation vacuum evaporation technology, raw material is the glass gall from mine, remove calcium through the purification process processing, become smart glass gall behind the impurity such as magnesium, smart glass gall enters the 5th and imitates vacuum vaporation system, be delivered in the quadruple effect evaporating pot after concentrating, change material then to first, second imitates in the evaporating pot, the material that removes condensing crystal changes through a cover centrifuge dehydration, dry screening, the quantitative package production technique obtains outside the high-content industrial anhydrous sodium sulfate, first, second imitate that evaporating pot also will produce contain the higher mother liquor of NaCl, be discharged into triple effect evaporator, evaporation concentration is again through another set of centrifuge dehydration, dry screening, the quantitative package production technique obtains low levels industrial anhydrous sodium sulfate product.Produce the product can obtain two different contents on such production line simultaneously, and to produce be continuous, stable, avoided the original production method when mother vat is filled after, must stop to produce the high-content product, adding is cooled to the mother liquor of envrionment temperature again.So both a large amount of energy can be saved, the effective production time waste can be reduced again.

2. can avoid the industrial anhydrous sodium sulfate waste water saltiness of production low levels in the existing production method higher, can not be thrown into nature, otherwise pollute the environment, can not discharge back mine again, otherwise can cause the saltiness of mine glass gall higher, therefore can only be stored in the mother vat, cause to produce and regulate difficulty, also can avoid simultaneously reducing because of low levels industrial anhydrous sodium sulfate production output, cause gas, electricity imbalance, need often emit a part and give birth to steam, both cause energy dissipation to cause the drawback of dry sound pollution again.

3. adopting this production technique and method to produce behind the product of two different contents the required equipment of operation such as nitre slurry bucket, centrifuge dehydration, dry screening and quantitative package is two to overlap separate equipment, therefore optional different material is made, avoid causing material corrosion and the short defective of service life of equipment, help reducing production costs.

[description of drawings] the present invention is further described below in conjunction with the drawings and specific embodiments.

Accompanying drawing is a technological process of production skeleton diagram of the present invention.

[embodiment] is with reference to accompanying drawing: a kind of industrial anhydrous sodium sulfate production method that obtains two kinds of different contents simultaneously that the following applicant of introduction implements, and it comprises the steps: 1, extracts former glass gall: extract former glass gall as raw material with high pressure centrifugal pump from mine; 2, adopt physical method to carry out glass gall processing 2 and remove impurity such as calcium contained in the former glass gall, magnesium, obtain smart glass gall; 3, smart glass gall being sent into smart glass gall bucket 3 stores; 4, with impeller pump the smart glass gall in the smart glass gall bucket is sent into the 5th and imitate evaporating pot 4, the 5th evaporator room pressure-0.097MPa (table) of imitating evaporating pot wherein, 43.5 ℃ of feed temperatures, each heat transfer area of imitating evaporating pot is 1100m ²Adopt external heating type pump circulation vacuum evaporation technology, smart glass gall is concentrated; 5, will send into quadruple effect evaporating pot 5 further evaporation concentration through the 5th concentrated smart glass gall of imitating after evaporating; 6, will deliver to first and second through the material after the quadruple effect evaporation concentration and imitate evaporating pot 6, under the pressure effect of saturation steam 12, make concentrated material precipitate and isolate xln and mother liquor, the first heating chamber pressure 0.293MPa (table) of imitating evaporating pot wherein, 128 ℃ of feed temperatures, second imitates the heating chamber pressure 0.115MPa (table) of evaporating pot, 107 ℃ of feed temperatures; 7, sedimentary xln in first and second effect evaporating pot is sent into nitre slurry bucket 7 and store transfer; 8, with impeller pump with the mass transport in the refining bucket 7 to centrifuge dewatering 8, after drying screening 9 and quantitative package 10 operations, obtain the high-content industrial anhydrous sodium sulfate again, send high-load industrial anhydrous sodium sulfate finished goods warehouse 11 to store at last; 9, simultaneously first and second mother liquor of imitating evaporating pot 6 is put into mother vat 13 transfers, store; 10, with the mother liquor in the mother vat 13, send into triple effect evaporator 14 with impeller pump, after carrying out evaporation concentration liquid and, centrifuge dewatering 16 15 temporary, dry screening 17 and quantitative package 18 operations through nitre slurry bucket, obtain the industrial anhydrous sodium sulfate of low levels, send into low levels industrial anhydrous sodium sulfate finished goods warehouse 19 at last, store the heating chamber pressure 0.009MPa (table) of triple effect evaporator wherein, 87 ℃ of feed temperatures.

Claims (2)

1. an industrial anhydrous sodium sulfate production method that obtains two kinds of different contents simultaneously is characterized in that: utilize to have five effect external heating type pump circulation vacuum-evaporation production lines now, extract former glass gall earlier from mine, through glass gall processing becoming impurity smart glass gall seldom; With pump smart glass gall is delivered to the 5th again and imitates the evaporating pot evaporation, change the evaporation of quadruple effect evaporating pot again over to, smart glass gall after will concentrating with pump then is delivered to first and second and imitates evaporating pot, and nitre slurry bucket sent into by the material that crystallizes out after centrifuge dehydration, dry screening, quantitative package become Na ₂SO ₄Content is at the high-content industrial anhydrous sodium sulfate more than 99.0%, after put in storage as finished product after the assay was approved; After first, second mother liquor of imitating the evaporating pot generation was handled in mother vat simultaneously, with evaporation concentration in pump delivery to the triple effect evaporator, the material that crystallizes out was sent in another nitre bucket, became Na through centrifuge dehydration, dry screening, quantitative package then ₂SO ₄Content is at the low levels industrial anhydrous sodium sulfate finished product of 70.0%-90.0%, after put in storage as finished product after the assay was approved.

2. according to the described industrial anhydrous sodium sulfate production method that obtains two kinds of different contents simultaneously of claim 1, it is characterized in that: the heating chamber gauge pressure of first evaporating pot is 0.293Mpa, 128 ℃ of feed temperatures, the heating chamber gauge pressure of second evaporating pot is 0.115Mpa, 107 ℃ of feed temperatures, the heating chamber gauge pressure of triple effect evaporator is 0.009Mpa, 87 ℃ of feed temperatures, the 5th heating chamber gauge pressure of imitating evaporating pot is-0.097Mpa, 43.5 ℃ of feed temperatures, each heat transfer area of imitating evaporating pot is 1100m ²

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