CN104310437A - Technique for preparing anhydrous nitre from mirabilite - Google Patents
Technique for preparing anhydrous nitre from mirabilite Download PDFInfo
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- CN104310437A CN104310437A CN201410532179.5A CN201410532179A CN104310437A CN 104310437 A CN104310437 A CN 104310437A CN 201410532179 A CN201410532179 A CN 201410532179A CN 104310437 A CN104310437 A CN 104310437A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention relates to a technique for preparing anhydrous nitre from mirabilite. A mechanical thermocompression technique and a thermal melting system are combined, and the temperature and solid-to-liquid ratio of the nitre slurry are controlled, thereby saving the external heating system of the thermal melting tank and reducing the vapor consumption. Meanwhile, secondary vapor is recompressed to the heating chamber of the evaporating tank by a vapor compressor, and the cycle is repeated, so that the overall system has small occupied area, is stable to operate and convenient for control and achieves the goal of energy saving.
Description
Technical field
The invention belongs to hot warm evaporative crystallization technique, is the anhydrous nitre technique of a mechanical vapour reheating compression techniques process saltcake system.
Background technology
In the embrane method denitration technology in the fields such as chlor-alkali, the high salt made from earth containing a comparatively high percentage of sodium chloride water containing high sodium sulfate concentration can be produced, and the saltcake solid that high salt made from earth containing a comparatively high percentage of sodium chloride water is obtained by freezing denitration mode, there is following processing mode at present:
A () is directly transported outward or landfill with solid waste form.Owing to containing a large amount of sodium sulfate in saltcake, directly outer row not only causes the pollution of local environment, also brings the significant wastage of resource simultaneously.
(b) multiple-effect evaporation method.Technical process is entering of the saltcake nitre bucket by centrifuge dehydration, and the nitre of discharging with evaporating pot is starched and mixed, and heats with secondary steam.Saltcake heat after melting anhydrous nitre slurry out carry out solid-liquid separation and obtain wet anhydrous nitre, then carry out drying treatment and obtain the anhydrous nitre of finished product and pack.Wherein, after being separated mother liquor preheating, adverse current enters triple effect, two effects, an effect evaporating pot successively, and an effect entering of nitre slurry nitre bucket nitre out, the secondary steam of end effect heats as the thermal source changing nitre bucket.This technique floor space is comparatively large, Controlling System relative complex, and change nitre bucket needs additional configuration pump circulation well heater, and along with coal price and the continuous of steam price are risen, running cost sharply rises.
Therefore, the development and application of energy conservation has become the core that product competitiveness and Sustainable development improve in enterprise, and mechanical vapour reheating compression (MVR) technology with obvious energy-saving effect has wide market outlook and using value.
Summary of the invention
The object of the present invention is to provide the anhydrous nitre technique of a kind of mechanical vapour reheating compression techniques process saltcake system, floor space is little, technical process simple, the equipment cycle of operation is long, the feature that automatic controlling level is high, energy consumption is lower to adopt this technique to reach.
The technical scheme of invention:
The anhydrous nitre technique of saltcake system, comprises the following steps:
A () enters heat through the saltcake solid that centrifuge dehydration obtains and melts tank, compress evaporating pot slurry out mix with mechanical thermal; Control heat and melt temperature 40 ~ 60 DEG C in tank;
B () heat is melted tank anhydrous nitre slurry out and is entered thickener and whizzer carries out solid-liquid separation;
C () mother liquor is 80 ~ 100 DEG C by the temperature after preheater preheats, thermal source is vapo(u)rization system water of condensation out;
D the mother liquor after () preheating enters mechanical thermo compression evaporating pot, controlling temperature in evaporating pot is 105 ~ 120 DEG C, the inlet steam temperature of vapour compressor is 100 ~ 110 DEG C, outlet steam temperature is 120 ~ 130 DEG C, feed liquid is concentrated in evaporating pot analyses nitre, the nitre slurry obtained drains into heat and melts tank, and solid-to-liquid ratio controls 15% ~ 30%;
E the wet nitre after () centrifuge dehydration enters drying bed, obtain the anhydrous nitre of product after drying.
Controlling heat in described (a) step, to melt temperature optimization in tank be 45 ~ 55 DEG C.
In described (c) step, mother liquor is 85 ~ 95 DEG C by the temperature optimization after preheater preheats.
Mother liquor after described (d) preheating enters mechanical thermo compression evaporating pot, and controlling temperature optimization in evaporating pot is 110 ~ 115 DEG C, and the inlet steam temperature of vapour compressor is optimized for 105 DEG C, and outlet steam temperature is optimized for 125 DEG C.Feed liquid is concentrated in evaporating pot analyses nitre, and the nitre slurry obtained drains into heat and melts tank, and solid-to-liquid ratio optimal control is 20% ~ 25%.
The present invention has following beneficial effect: adopt mechanical thermal compress technique and heat to melt the combination of system, by controlling temperature and the solid-to-liquid ratio of nitre slurry, eliminating the external heat system that heat melts tank, decreasing the consumption of steam; Meanwhile, by vapour compressor, the secondary steam of evaporation is pushed back again the heating chamber of evaporating pot, so recycle, make that whole system floor space is little, stable operation is convenient to control, reach energy-conservation object.
Accompanying drawing explanation
Fig. 1 is process flow diagram.
Embodiment
Embodiment 1
The saltcake solid obtaining water content 4% through centrifuge dehydration enters heat and melts tank, compresses evaporating pot slurry out mix with mechanical thermal, and controlling the temperature that heat melts tank is 45 DEG C; Heat is melted tank anhydrous nitre slurry out and is entered thickener and whizzer carries out solid-liquid separation; Mother liquor is 81 DEG C by the temperature after preheater preheats, and thermal source is vapo(u)rization system water of condensation out; Mother liquor after preheating enters mechanical thermo compression evaporating pot, and controlling temperature in evaporating pot is 117 DEG C, vapour compressor inlet steam temperature 105 DEG C, outlet steam temperature 125 DEG C, feed liquid is concentrated in evaporating pot analyses nitre, and the nitre slurry obtained drains into heat and melts tank, and solid-to-liquid ratio controls 22%; Wet nitre after centrifuge dehydration enters drying bed, obtains the anhydrous nitre of product after drying, and percent mass purity is 99.7%.
Embodiment 2
The saltcake solid obtaining water content 5% through centrifuge dehydration enters heat and melts tank, compresses evaporating pot slurry out mix with mechanical thermal, and controlling the temperature that heat melts tank is 50 DEG C; Heat is melted tank anhydrous nitre slurry out and is entered thickener and whizzer carries out solid-liquid separation; Mother liquor is 87 DEG C by the temperature after preheater preheats, and thermal source is vapo(u)rization system water of condensation out; Mother liquor after preheating enters mechanical thermo compression evaporating pot, and controlling temperature in evaporating pot is 119 DEG C, vapour compressor inlet steam temperature 107 DEG C, outlet steam temperature 128 DEG C, feed liquid is concentrated in evaporating pot analyses nitre, and the nitre slurry obtained drains into heat and melts tank, and solid-to-liquid ratio controls 25%; Wet nitre after centrifuge dehydration enters drying bed, obtains the anhydrous nitre of product after drying, and percent mass purity is 99.5%.
Claims (4)
1. the anhydrous nitre technique of saltcake system, is characterized in that comprising the following steps:
A () enters heat through the saltcake solid that centrifuge dehydration obtains and melts tank, compress evaporating pot slurry out mix with mechanical thermal; Control heat and melt temperature 40 ~ 60 DEG C in tank;
B () heat is melted tank anhydrous nitre slurry out and is entered thickener and whizzer carries out solid-liquid separation;
C () mother liquor is 80 ~ 100 DEG C by the temperature after preheater preheats, thermal source is vapo(u)rization system water of condensation out;
D the mother liquor after () preheating enters mechanical thermo compression evaporating pot, controlling temperature in evaporating pot is 105 ~ 120 DEG C, the inlet steam temperature of vapour compressor is 100 ~ 110 DEG C, outlet steam temperature is 120 ~ 130 DEG C, feed liquid is concentrated in evaporating pot analyses nitre, the nitre slurry obtained drains into heat and melts tank, and solid-to-liquid ratio controls 15% ~ 30%;
E the wet nitre after () centrifuge dehydration enters drying bed, obtain the anhydrous nitre of product after drying.
2. the anhydrous nitre technique of saltcake system according to claim 1, is characterized in that: control heat in (a) step and melt temperature 45 ~ 55 DEG C in tank.
3. the anhydrous nitre technique of saltcake system according to claim 1, is characterized in that: in (c) step, mother liquor is 85 ~ 95 DEG C by the temperature after preheater preheats.
4. the anhydrous nitre technique of saltcake system according to claim 1, it is characterized in that: the mother liquor after (d) preheating enters mechanical thermo compression evaporating pot, controlling temperature in evaporating pot is 110 ~ 115 DEG C, the inlet steam temperature of vapour compressor is 103 ~ 108 DEG C, outlet steam temperature is 123 ~ 128 DEG C, feed liquid is concentrated in evaporating pot analyses nitre, and the nitre slurry obtained drains into heat and melts tank, and solid-to-liquid ratio controls 20% ~ 25%.
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| CN201410532179.5A CN104310437B (en) | 2014-10-11 | 2014-10-11 | The anhydrous nitre technique of saltcake system |
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| CN201410532179.5A CN104310437B (en) | 2014-10-11 | 2014-10-11 | The anhydrous nitre technique of saltcake system |
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| CN104310437A true CN104310437A (en) | 2015-01-28 |
| CN104310437B CN104310437B (en) | 2016-04-13 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1837050A (en) * | 2006-04-14 | 2006-09-27 | 中盐制盐工程技术研究院 | Process for preparing anhydrous mirabilite by freezing method |
| CN101966997A (en) * | 2010-10-29 | 2011-02-09 | 江苏瑞普膜技术有限公司 | Process and device for producing pyrotechnite from sodium sulfate decahydrate |
| CN201914925U (en) * | 2011-01-27 | 2011-08-03 | 淄博通达防腐设备有限公司 | Mirabilite dehydrating and drying system |
| CN102320630A (en) * | 2011-09-05 | 2012-01-18 | 湖南衡阳新澧化工有限公司 | Production method of anhydrous sodium sulfate and production equipment thereof |
| CN102515207A (en) * | 2011-12-13 | 2012-06-27 | 宜宾天原集团股份有限公司 | Method for recovering sulfate radicals from dechlorinated light salt brine to prepare anhydrous sodium sulfate |
| CN102786068A (en) * | 2012-04-24 | 2012-11-21 | 天能化工有限公司 | Method for preparing anhydrous sodium sulphate by mirabilite during chlor-alkali production |
| CN103318924A (en) * | 2013-06-25 | 2013-09-25 | 代元军 | Energy-saving equipment and energy-saving method for smelting mine by virtue of waste heat |
| CN203602366U (en) * | 2013-11-25 | 2014-05-21 | 广州新普利节能环保科技有限公司 | Preparation system of anhydrous sodium sulphate |
-
2014
- 2014-10-11 CN CN201410532179.5A patent/CN104310437B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1837050A (en) * | 2006-04-14 | 2006-09-27 | 中盐制盐工程技术研究院 | Process for preparing anhydrous mirabilite by freezing method |
| CN101966997A (en) * | 2010-10-29 | 2011-02-09 | 江苏瑞普膜技术有限公司 | Process and device for producing pyrotechnite from sodium sulfate decahydrate |
| CN201914925U (en) * | 2011-01-27 | 2011-08-03 | 淄博通达防腐设备有限公司 | Mirabilite dehydrating and drying system |
| CN102320630A (en) * | 2011-09-05 | 2012-01-18 | 湖南衡阳新澧化工有限公司 | Production method of anhydrous sodium sulfate and production equipment thereof |
| CN102515207A (en) * | 2011-12-13 | 2012-06-27 | 宜宾天原集团股份有限公司 | Method for recovering sulfate radicals from dechlorinated light salt brine to prepare anhydrous sodium sulfate |
| CN102786068A (en) * | 2012-04-24 | 2012-11-21 | 天能化工有限公司 | Method for preparing anhydrous sodium sulphate by mirabilite during chlor-alkali production |
| CN103318924A (en) * | 2013-06-25 | 2013-09-25 | 代元军 | Energy-saving equipment and energy-saving method for smelting mine by virtue of waste heat |
| CN203602366U (en) * | 2013-11-25 | 2014-05-21 | 广州新普利节能环保科技有限公司 | Preparation system of anhydrous sodium sulphate |
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| CN104310437B (en) | 2016-04-13 |
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