CN100417594C - Production process of large grain anhydrous sodium sulfate with natural salt lake mirabilite - Google Patents
Production process of large grain anhydrous sodium sulfate with natural salt lake mirabilite Download PDFInfo
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- CN100417594C CN100417594C CNB2005101379872A CN200510137987A CN100417594C CN 100417594 C CN100417594 C CN 100417594C CN B2005101379872 A CNB2005101379872 A CN B2005101379872A CN 200510137987 A CN200510137987 A CN 200510137987A CN 100417594 C CN100417594 C CN 100417594C
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- Prior art keywords
- anhydrous sodium
- tensio
- active agent
- clear solution
- mirabilite
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Abstract
The production process of large grain anhydrous sodium sulfate with natural salt lake mirabilite includes the steps of washing mirabilite, decomposing mirabilite, refining, settlement, neutralizing with sulfuric acid to obtain clear solution, evaporating, centrifuging to dewater, and drying with hot blast to obtain product. It features the addition of surfactant solution comprising sodium dodecyl benzene sulfonate, sodium ethoxy alkyl sulfate and warm water at about 40deg.c into the clear solution before evaporating. The production process can produce anhydrous sodium sulfate of granularity of 200-1000 microns and with high economic value.
Description
One, technical field
The present invention relates to the production method of anhydrous sodium sulphate, relate in particular to the method that natural salt lake mirabilite is produced large grain anhydrous sodium sulfate.
Two, background technology
Anhydrous sodium sulphate also claims Sodium sulfate anhydrous.min(99), is a kind of industrial chemicals.At present, utilize the method for natural salt lake mirabilite production anhydrous sodium sulphate to be: through washing nitre, change nitre, refining, sedimentation, adding acid, evaporation, centrifuge dehydration, warm air drying operation and make finished product.For example, the complete molten dehydration by evaporation method of pointing out in " salt chemical engineering technology " (in December, 1988 first version first impression ISBN-5019-0516-9/TS.355) book that light industry press publishes: the saltcake of fetching by the salt lake, isolate at reinforced place that big stone, clod are laggard goes into feed bin, the material of being emitted by feed bin is after washing, promptly wash after the nitre operation, the water that adds about 60-70 ℃ of being put into nitre jar dissolves again, this process is changed the nitre operation exactly, lysate is delivered to the first grade subsides pond and is carried out sedimentation, mainly be impurity such as sedimentation silt, obtain a secondary clearing nitre liquid; Then, a secondary clearing nitre liquid is delivered to added Na in the reaction tank
2CO
3Fully react with NaOH, enter the secondary settling bowl, remove calcium, magnesium ion, this process is exactly a refining step, after sedimentation, obtains post-defecation nitre liquid; In post-defecation nitre liquid, add the sulfuric acid neutralization, regulate pH value, obtain clear solution; At last, with the clear solution forced evaporation, centrifuge dehydration, warm air drying makes finished product.This method to the specification of quality of salt lake mirabilite is: Na
2SO
4〉=36%, CaSO
4≤ 0.6%, NaCl≤3%, MgSO
4≤ 0.25%.In above-mentioned technological process, controlled variable is: washing nitre clear water temperature is underground water normal temperature; Changing nitre jar temperature is 60 ℃--about 70 ℃, changing nitre jar glass gall concentration is 31 ° of Be
/--35 ° of Be
/In the clear liquid glass gall: Na
2SO
4320--390g/L, NaCl≤15g/L, CaSO
4≤ 0.25g/L, MgSO
4≤ 0.15g/L; The clear solution pH value is 5.0--5.5.The anhydrous sodium sulphate that this method is produced, its particle diameter has only about 150 μ m.
Quality product about anhydrous sodium sulphate, GB GB/T6009-2003 has formulated quality index to anhydrous sodium sulphate master content, whiteness, muriate, calcium magnesium, water-insoluble, moisture content, iron level, but, do not do particular requirement to anhydrous sodium sulphate particulate size.But, in recent years, along with the development of chemical industry, some use anhydrous sodium sulphate enterprise, its granularity has been proposed technical requirements, and the particle diameter that requires anhydrous sodium sulphate is controlled needs such as dissolution rate, minimizing dust pollution when satisfying its special producing more than 200 μ m.Large grain anhydrous sodium sulfate generally is meant: the anhydrous sodium sulphate of particle diameter more than 200 μ m, and its economic worth height, the market demand amount is big.Large grain anhydrous sodium sulfate mainly is used in: industries such as washing product industry, high precision dyeing, glass industry, special appliances for labor protection.At present, the method for natural salt lake mirabilite production anhydrous sodium sulphate can not be produced large grain anhydrous sodium sulfate, can not meeting the market requirement.
Three, summary of the invention
The objective of the invention is provides a kind of new production method for satisfying the demand of market to large grain anhydrous sodium sulfate, changes the crystallization condition of clear solution in the vaporizer, and obtaining particle diameter is the large grain anhydrous sodium sulfate of 200-1000 μ m.
The production method that the present invention utilizes natural salt lake mirabilite to produce large grain anhydrous sodium sulfate is: through washing nitre, change nitre, refining, sedimentation, add the sulfuric acid neutralization, obtain clear solution, then, with the clear solution forced evaporation, centrifuge dehydration again, warm air drying, make finished product, it is characterized in that: before above-mentioned forced evaporation operation, in clear solution, add tensio-active agent stoste, and stir, mixed ratio is to add 1 cubic metre of tensio-active agent stoste in 40 cubic metres of clear solutions, and then carry out described evaporization process, when being evaporated to solid-to-liquid ratio and being 1: 3, enter described centrifuge dehydration again, the warm air drying operation makes finished product, and described tensio-active agent stoste is by Sodium dodecylbenzene sulfonate, the warm water of ethoxylated alkyl sulfate and about 40 ℃ mixes formulated, mixed ratio is: prepare 1 cubic metre of tensio-active agent stoste, need 60 kilograms of Sodium dodecylbenzene sulfonatees, ethoxylated alkyl sulfate content is 200 kilograms of 90% emulsions, all the other are water.
The present invention records on the basis of a large amount of experiments, and anhydrous sodium sulphate crystal size size is relevant with evaporation capacity, input concentration, evaporation time, tensio-active agent etc.Especially adding specified quantitative Sodium dodecylbenzene sulfonate and these two kinds of tensio-active agents of ethoxylated alkyl sulfate can change crystal size preferably in the metabisulfite solution crystallisation process.Can control the generation quantity of sodium sulfate nucleus and change its crystalline profile, can make the sodium sulfate crystal chap big.
Advantage of the present invention is: owing to adopt technique scheme, can obtain particle diameter is the anhydrous sodium sulphate product of 200-1000 μ m, can obtain the macrobead product, to improve the economic worth of product, meets the need of market.Do not influence product master content, can reduce vaporizer and rinse a jar number of times, effectively enhance productivity, technology is simple, invests little.
Four, embodiment
Gather the natural salt lake mirabilite raw material,, obtain 120 cubic metres of clear solutions, in clear solution, add 3 cubic metres of tensio-active agent stostes, and stir, afterwards, carry out forced evaporation again through washing nitre, change nitre, refining, sedimentation, adding in the sulfuric acid and operation.When being evaporated to solid-to-liquid ratio and being 1: 3, carry out centrifuge dehydration, warm air drying, make the anhydrous sodium sulphate finished product at last.Tensio-active agent stoste is that the warm water by Sodium dodecylbenzene sulfonate, ethoxylated alkyl sulfate and about 40 ℃ mixes formulated.Mixed ratio is: prepare 3 cubic metres of tensio-active agent stostes, needing 180 kilograms of Sodium dodecylbenzene sulfonatees, ethoxylated alkyl sulfate content is 600 kilograms of 90% emulsions, and all the other are water.
Claims (1)
1. a natural salt lake mirabilite is produced the method for large grain anhydrous sodium sulfate, it is through washing nitre, change nitre, refining, sedimentation, add the sulfuric acid neutralization, obtain clear solution, then, with the clear solution forced evaporation, centrifuge dehydration again, warm air drying, make finished product, it is characterized in that: before above-mentioned forced evaporation operation, in clear solution, add tensio-active agent stoste, and stir, mixed ratio is to add 1 cubic metre of tensio-active agent stoste in 40 cubic metres of clear solutions, and then carries out described evaporization process, when being evaporated to solid-to-liquid ratio and being 1: 3, enter described centrifuge dehydration again, the warm air drying operation makes finished product, and described tensio-active agent stoste is by Sodium dodecylbenzene sulfonate, the warm water of ethoxylated alkyl sulfate and about 40 ℃ mixes formulated, and mixed ratio is: prepare 1 cubic metre of tensio-active agent stoste, need 60 kilograms of Sodium dodecylbenzene sulfonatees, ethoxylated alkyl sulfate content is 200 kilograms of 90% emulsions, and all the other are water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101379872A CN100417594C (en) | 2005-12-22 | 2005-12-22 | Production process of large grain anhydrous sodium sulfate with natural salt lake mirabilite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101379872A CN100417594C (en) | 2005-12-22 | 2005-12-22 | Production process of large grain anhydrous sodium sulfate with natural salt lake mirabilite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1986406A CN1986406A (en) | 2007-06-27 |
| CN100417594C true CN100417594C (en) | 2008-09-10 |
Family
ID=38183367
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101379872A Expired - Fee Related CN100417594C (en) | 2005-12-22 | 2005-12-22 | Production process of large grain anhydrous sodium sulfate with natural salt lake mirabilite |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948123B (en) * | 2010-08-20 | 2012-05-23 | 四川省川眉芒硝有限责任公司 | Technique for manufacturing anhydrous medicinal mirabilite |
| CN103896309A (en) * | 2014-03-28 | 2014-07-02 | 南风化工集团股份有限公司 | Production method of chemical agent anhydrous sodium sulfate |
| CN106745081A (en) * | 2015-11-23 | 2017-05-31 | 湖南衡阳新澧化工有限公司 | A kind of production method of large grain anhydrous sodium sulfate |
| CN106745079A (en) * | 2015-11-23 | 2017-05-31 | 湖南衡阳新澧化工有限公司 | A kind of production method of glauber salt |
| CN106752088A (en) * | 2015-11-24 | 2017-05-31 | 湖南衡阳新澧化工有限公司 | A kind of production method of superfine modified anhydrous sodium sulphate |
| CN110921684A (en) * | 2018-09-19 | 2020-03-27 | 南风化工集团股份有限公司 | Production method of chemical reagent anhydrous sodium sulfate |
| CN109592698B (en) * | 2018-12-12 | 2021-05-25 | 天津大学 | A kind of method for preparing funnel-shaped sodium sulfate from high-salt waste water |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA986684A (en) * | 1972-09-13 | 1976-04-06 | Richard S. Aston | Production of anhydrous sodium sulphate |
| CN1178195A (en) * | 1996-08-29 | 1998-04-08 | 内蒙古伊克昭化工研究设计院 | Production of crystal anhydrous sodium sulphate from nitrate containing brine |
-
2005
- 2005-12-22 CN CNB2005101379872A patent/CN100417594C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA986684A (en) * | 1972-09-13 | 1976-04-06 | Richard S. Aston | Production of anhydrous sodium sulphate |
| CN1178195A (en) * | 1996-08-29 | 1998-04-08 | 内蒙古伊克昭化工研究设计院 | Production of crystal anhydrous sodium sulphate from nitrate containing brine |
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| Publication number | Publication date |
|---|---|
| CN1986406A (en) | 2007-06-27 |
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Granted publication date: 20080910 Termination date: 20100122 |