CN104402023A - Production method for raising granularity of sodium bicarbonate product obtained by carbonization method - Google Patents
Production method for raising granularity of sodium bicarbonate product obtained by carbonization method Download PDFInfo
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- CN104402023A CN104402023A CN201410636126.8A CN201410636126A CN104402023A CN 104402023 A CN104402023 A CN 104402023A CN 201410636126 A CN201410636126 A CN 201410636126A CN 104402023 A CN104402023 A CN 104402023A
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Abstract
The invention discloses a production method for raising granularity of a sodium bicarbonate product obtained by a carbonization method. The production method comprises the following steps: (1) after dissolved and purified, raw materials are sent to a feed inlet of a carbonizer and undergo a carbonization reaction in the carbonizer so as to generate crystal magma with sodium bicarbonate crystals; (2) a part of crystal magma flowing out of an alkali outlet of the carbonizer enters a thickener to thicken, and a part of crystal magma returns to the carbonizer; (3) the thickened sodium bicarbonate crystals are continuously conveyed into a centrifuge to be dried; and (4) sodium bicarbonate which has undergone centrifugal drying undergoes pneumatic drying, and the sodium bicarbonate which has undergone pneumatic drying is cooled after moisture content reaches the standard, so as to obtain a sodium bicarbonate finished product. In comparison with methods such as a method of increasing external crystallizers and the like, the method provided by the invention can be adopted to increase granularity of the product without the need of changing technological processes of an original carbonization method and is simple to operate. By the above method, each index reaches related standards in the industry.
Description
Technical field
The present invention relates to a kind of production method improving reactive crystallization product granularity, the invention particularly relates to a kind of production method improving carborization sodium bicarbonate product granularity.
Background technology
Sodium bicarbonate is one of important inorganic chemical product, and it is widely used in the various fields such as chemical industry, light industry, medicine, weaving and fine chemistry industry.China is the important producing country of sodium bicarbonate product, and the scale so far more than millions of ton of shape, is only second to the U.S. and occupies second place of the world, for many years always with the speed increment of 2%-3% every year on average.
Although the output of China's sodium bicarbonate is very high, sodium bicarbonate product is single, can not adapt to the particular requirement of some enterprises and client, the range of application of China's sodium bicarbonate with consumption structure with abroad comparing, in food, medicine and other fields and be abroad more or less the same; Then with abroad greatly differ from each other in the application of feed additive field.In recent years, along with the develop rapidly of China's feedstuff industry, sodium bicarbonate is also significantly rising as the demand of fodder additives.But different from the application requiring in medicine and the field such as food, feedstuff industry there are certain requirements sodium bicarbonate product granularity.Therefore the suitability for industrialized production of granular sodium bicarbonate becomes the hot issue that current numerous enterprises is closely paid close attention to.
Existing patented technology in the research of granular sodium bicarbonate, the replacement(metathesis)reaction method that to have with sodium-chlor and bicarbonate of ammonia be raw material.Chinese patent CN101696022A discloses " processing method of producing food grade saleratus by double decomposition ", adopt batch production, scale is less, its replacement(metathesis)reaction adopts third order reaction technique, vacuum belt filter is repeatedly adopted to wash in reaction process, add complex process degree, product is easy to cause artificial pollution; And Chinese patent CN101185484A discloses " stepless control double decomposition reaction foodstuff level baking soda production technique ", relative to patent CN101696022A technology, this technique achieves continuous prodution, the replacement(metathesis)reaction of sodium-chlor and bicarbonate of ammonia is carried out in first mixer, can produce 20-300 order plurality of specifications product, but in the lock out operation of follow-up sodium bicarbonate product and ammonium chloride, this process energy consumption is excessive, the wash water consumed is too much, and cost is larger.
The publication number of Solvay's application is the patent of CN1047839A, adopt the principle of additional fluidized-bed crystallizer, supersaturated solution is grown up around crystal seed, the method not only needs to build specific crystallizer, and the certain degree of supersaturation of solution need be maintained, operation easier is comparatively large, and at present, having no domestic has industrial applications to report.
Summary of the invention
The object of the invention is to the deficiency overcoming meticulous, the easy caking of prior art product granularity, a kind of production method improving carborization sodium bicarbonate product granularity is provided, carborization basis realizes with substandard products alkali be raw material, low cost, technological operation be simple, continuous production goes out particle diameter at 150 order-40 object sodium bicarbonate products.
A kind of production method improving carborization sodium bicarbonate product granularity of the present invention, it comprises the following steps:
(1) deliver to carbonating tower opening for feed by after material dissolution also purification, in carbonating tower, carry out carburizing reagent, generate the magma with sodium bicarbonate crystallization;
(2) from the magma that carbonating tower alkali outlet flows out, a part enters thickener stiff, and a part is back to carbonating tower, and rework solution flow accounts for the 15%-30% that carbonating tower enters alkali lye total flux;
(3) the sodium bicarbonate crystallization continus convergence after stiff is dry to whizzer;
(4) sodium bicarbonate after centrifugal drying is carried out air stream drying, after moisture content is up to standard, cooling obtains sodium bicarbonate finished product.
Adopt during the inventive method and there is following advantage:
Compared with method such as increase outside crystallizer etc., without the need to changing original carborization technical process, can realize product granularity and increase, simple to operate, indices all reaches industry relevant criterion.
The granularity of sodium bicarbonate product can be improved significantly, and according to production reality and customer demand, production method can be adjusted flexibly, the product of 150 order-40 order all sizes can be produced.The product maximum particle diameter produced can reach 40 orders, and 60-120 order quality product content accounts for 60%-70%, and in industrial production, the alkaline cycle of carbonating tower is significantly extended.
Accompanying drawing explanation
Fig. 1 is a kind of production method schematic flow sheet improving carborization sodium bicarbonate product granularity of the present invention;
Fig. 2 is the carborization sodium bicarbonate Granularity Distribution adopting existing method to produce;
Fig. 3 is the carborization sodium bicarbonate Granularity Distribution adopting method of the present invention to produce.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
A kind of production method improving carborization sodium bicarbonate product granularity of the present invention as shown in drawings, it comprises the following steps:
(1) deliver to carbonating tower opening for feed by after material dissolution also purification, in carbonating tower, carry out carburizing reagent, generate the magma with sodium bicarbonate crystallization;
Described raw material is industrial substandard products sodium carbonate, heavy grey fine powder or industrial substandard products sodium carbonate and the mixture weighing grey fine powder.Industry substandard products sodium carbonate any one index be often referred in chloride content, iron level or water insoluble matter content exceedes the product of national standard; Heavy grey fine powder is often referred to the product through physics screening screen overflow, and this product indices meets soda ash index request, but granularity does not meet standard.
Purification is preferred adopts settling tank and millipore filter successively, and after clarification, solution enters alkali lye storage tank, then delivers to carbonating tower.
(2) from the magma that carbonating tower alkali outlet flows out, a part enters thickener stiff, and a part is back to carbonating tower, and rework solution flow accounts for the 15%-30% that carbonating tower enters alkali lye total flux, and the initial degree of supersaturation of realization response liquid reduces, and product granularity increases;
(3) the sodium bicarbonate crystallization continus convergence after stiff is dry to whizzer;
(4) sodium bicarbonate after centrifugal drying is carried out air stream drying, after moisture content is up to standard, cooling obtains sodium bicarbonate finished product.
As one of the present invention preferred embodiment, also comprise the sodium bicarbonate crystal seed supersaturation suspension of predetermined particle size range in described step (1) as raw material, the substandard products alkali raw material after purifying in described sodium bicarbonate crystal seed supersaturation suspension and step (1) sends into carbonating tower jointly.The initial degree of supersaturation of alkaline liquid can be eliminated like this, make solute around seeded growth, impel crystalline product granularity to increase.
Method prepared by sodium bicarbonate crystal seed supersaturation suspension is: the sodium bicarbonate finished product choosing predetermined particle size range sends into crystal seed tank as crystal seed, adopts lysate to be configured to supersaturation suspension in crystal seed tank.The centrifuge mother liquor preparation that lysate preferably adopts whizzer in step (3) to throw away.
The centrifuge mother liquor that the choline liquid that preferred the inventive method step (1) Raw dissolves employing throws away from whizzer in step (3).
In the inventive method, operating parameters controls to adopt the controling parameters in existing production process of sodium bicarbonate.
Can find out before not adding crystal seed from Fig. 2 and Fig. 3, the product median size of sodium bicarbonate is 85.16 μm, and after adopting the method for adding crystal seed, the median size of the product produced reaches 176.5 μm.
Comparative example 1
Adopt existing method to carry out sodium bicarbonate production, the sodium bicarbonate product granularity that carbonating tower device is produced is comparatively thin, and median size is 85.16 μm, and the alkaline cycle of carbonating tower is 48h.
Embodiment 1
(1) the mixture dissolving of industrial substandard products sodium carbonate and heavy grey fine powder is made into the mixing solutions that total alkalinity is 80-85tt, adopts settling tank and millipore filter purification to make the calcium-magnesium content in solution be down to below 20ppm, then with 80-110m successively
3the flow of/h delivers to carbonating tower opening for feed, in carbonating tower, carry out carburizing reagent, generates the magma with sodium bicarbonate crystallization;
(2) from the magma that carbonating tower alkali outlet flows out, a part enters thickener stiff and reaches 6.3%-6.8% to biodiversity content, a part is back to carbonating tower, rework solution flow account for that carbonating tower enters alkali lye total flux 30%, the initial degree of supersaturation of realization response liquid reduces, and product granularity increases;
(3) the sodium bicarbonate crystallization continus convergence after stiff is dry to whizzer;
(4) pneumatic dryer sodium bicarbonate after centrifugal drying being sent into 170 DEG C of-190 DEG C of high temperature carries out the air stream drying of about 10s, then, through cold front heavy rain, after vibrosieve, packing shop packaging is entered, can obtain the output of 7.5t/h, product index reaches industry standard.
The centrifuge mother liquor that the choline liquid that substandard products alkali material dissolution in step (1) adopts throws away from whizzer in step (3).
After testing: the mass content >70% of the product cut size <120 order (>125 μm) obtained, the mass content >28% of 80 order-120 orders (125 μm ﹤ particle diameter ﹤ 180 μm), the mass content >40% of 60 order-80 orders (180 μm ﹤ particle diameter ﹤ 250 μm), 40 order-60 orders (250 μm of ﹤ Li Jing≤420 μm) <2%.The alkaline cycle of carbonating tower is 120h.
Embodiment 2
(1) industrial substandard products sodium carbonate dissolving is made into the mixing solutions that total alkalinity is 80-85tt, adopts settling tank and millipore filter purification to make the calcium-magnesium content in solution be down to below 20ppm successively;
By embodiment 1 method produce particle diameter be 80-120 order sodium bicarbonate solid particulate together with the centrifugal wash water of 80-90 DEG C in crystal seed tank mix and blend (note: this temperature stir under; solid sodium bicarbonate particle is substantially insoluble); solid masses percentage composition is 30%
Then will purify solution in rear solution and crystal seed tank to mix with 4-6m
3the flow of/h delivers to carbonating tower opening for feed, in carbonating tower, carry out carburizing reagent, generates the magma with sodium bicarbonate crystallization; Described substandard products alkali raw material is industrial substandard products sodium carbonate.
(2) from the magma that carbonating tower alkali outlet flows out, a part enters thickener stiff and reaches 5.0%-6.0% to biodiversity content, a part is back to carbonating tower, rework solution flow account for that carbonating tower enters alkali lye total flux 25%, the initial degree of supersaturation of realization response liquid reduces, and product granularity increases;
(3) the sodium bicarbonate crystallization continus convergence after stiff is dry to whizzer;
(4) pneumatic dryer sodium bicarbonate after centrifugal drying being sent into 170 DEG C of-190 DEG C of high temperature carries out the air stream drying of about 10s, then, through cold front heavy rain, after vibrosieve, packing shop packaging is entered, can obtain the output of 7.5t/h, product index reaches industry standard.
The centrifuge mother liquor that the choline liquid that substandard products alkali material dissolution in step (1) adopts throws away from whizzer in step (3).
After testing: product <80 order (particle diameter >180 μm) the mass content >60% obtained, 60 order-80 orders (180 μm of < particle diameter <250 μm) mass content >44%, 40 order-60 orders (250 μm of < Li Jing≤420 μm) <16%.The alkaline cycle of carbonating tower is 120h.
Embodiment 3
(1) heavy grey fine powder dissolving is made into the mixing solutions that total alkalinity is 80-85tt, adopts settling tank and millipore filter purification to make the calcium-magnesium content in solution be down to below 20ppm, then with 80-110m successively
3the flow of/h delivers to carbonating tower opening for feed, in carbonating tower, carry out carburizing reagent, generates the magma with sodium bicarbonate crystallization;
(2) from the magma that carbonating tower alkali outlet flows out, a part enters thickener stiff and reaches 6.3%-6.8% to biodiversity content, a part is back to carbonating tower, rework solution flow account for that carbonating tower enters alkali lye total flux 15%, the initial degree of supersaturation of realization response liquid reduces, and product granularity increases;
(3) the sodium bicarbonate crystallization continus convergence after stiff is dry to whizzer;
(4) pneumatic dryer sodium bicarbonate after centrifugal drying being sent into 170 DEG C of-190 DEG C of high temperature carries out the air stream drying of about 10s, then, through cold front heavy rain, after vibrosieve, packing shop packaging is entered, can obtain the output of 7.5t/h, product index reaches industry standard.
After testing: the mass content >60% of the product cut size <120 order (>125 μm) obtained, the mass content >35% of 80 order-120 orders (125 μm ﹤ particle diameter ﹤ 180 μm), the mass content >25% of 60 order-80 orders (180 μm ﹤ particle diameter ﹤ 250 μm).The alkaline cycle of carbonating tower is 120h.
Claims (7)
1. improve a production method for carborization sodium bicarbonate product granularity, it is characterized in that it comprises the following steps:
(1) deliver to carbonating tower opening for feed by after substandard products alkali material dissolution also purification, in carbonating tower, carry out carburizing reagent, generate the magma with sodium bicarbonate crystallization;
(2) from the magma that carbonating tower alkali outlet flows out, a part enters thickener stiff, and a part is back to carbonating tower, and rework solution flow accounts for the 15%-30% that carbonating tower enters alkali lye total flux;
(3) the sodium bicarbonate crystallization continus convergence after stiff is dry to whizzer;
(4) sodium bicarbonate after centrifugal drying is carried out air stream drying, after moisture content is up to standard, cooling obtains sodium bicarbonate finished product.
2. the production method of raising carborization sodium bicarbonate product granularity according to claim 1, it is characterized in that: also comprise the sodium bicarbonate crystal seed supersaturation suspension of predetermined particle size range in described step (1) as raw material, the substandard products alkali raw material after purifying in described sodium bicarbonate crystal seed supersaturation suspension and step (1) sends into carbonating tower jointly.
3. the production method of raising carborization sodium bicarbonate product granularity according to claim 2, it is characterized in that: method prepared by sodium bicarbonate crystal seed supersaturation suspension is: the sodium bicarbonate finished product choosing predetermined particle size range sends into crystal seed tank as crystal seed, adopts lysate to be configured to supersaturation suspension in crystal seed tank.
4. the production method of raising carborization sodium bicarbonate product granularity according to claim 3, is characterized in that: the centrifuge mother liquor preparation that described lysate adopts whizzer in step (3) to throw away.
5. according to the production method of the raising carborization sodium bicarbonate product granularity one of claim 1-4 Suo Shu, it is characterized in that: described substandard products alkali raw material is industrial substandard products sodium carbonate, heavy grey fine powder or industrial substandard products sodium carbonate and the mixture weighing grey fine powder.
6. the production method of raising carborization sodium bicarbonate product granularity according to claim 5, is characterized in that: the purification in described step (1) adopts settling tank and millipore filter successively.
7. the production method of raising carborization sodium bicarbonate product granularity according to claim 6, is characterized in that: the centrifuge mother liquor that the choline liquid that in described step (1), substandard products alkali material dissolution adopts throws away from whizzer in step (3).
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105819471A (en) * | 2016-05-25 | 2016-08-03 | 天津渤化永利化工股份有限公司 | Method for producing baking soda large in particle size |
| CN108128787A (en) * | 2018-01-13 | 2018-06-08 | 安徽金禾实业股份有限公司 | A kind of ammonium hydrogen carbonate recrystallization production method |
| CN108358220A (en) * | 2018-03-07 | 2018-08-03 | 武汉德泽环保科技有限公司 | A kind of method and apparatus producing sodium bicarbonate |
| CN109761248A (en) * | 2019-03-12 | 2019-05-17 | 谢精忠 | Sodium bicarbonate preparation facilities and preparation method |
| CN111977673A (en) * | 2020-07-29 | 2020-11-24 | 山东海天生物化工有限公司 | Production process of baking soda |
| CN112777613A (en) * | 2021-01-29 | 2021-05-11 | 山东海天生物化工有限公司 | Process method for improving grain size of carbonization reaction material in carbonization tower in soda production |
| CN113244753A (en) * | 2021-05-18 | 2021-08-13 | 宝武水务科技有限公司 | Flue gas carbon dioxide recovery and resource utilization device and method |
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| CN101185484A (en) * | 2007-11-08 | 2008-05-28 | 衡阳市海联盐卤化工有限公司 | Production process of continuous program controlled double decomposition reaction foodstuff level baking soda |
| CN101696022A (en) * | 2009-10-29 | 2010-04-21 | 湖南裕华化工集团有限公司 | Process for producing food grade saleratus by double decomposition |
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Patent Citations (3)
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| US5290322A (en) * | 1989-04-24 | 1994-03-01 | Solvay & Cie (Societe Anonyme) | Process for the crystallization of sodium bicarbonate |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105819471A (en) * | 2016-05-25 | 2016-08-03 | 天津渤化永利化工股份有限公司 | Method for producing baking soda large in particle size |
| CN108128787A (en) * | 2018-01-13 | 2018-06-08 | 安徽金禾实业股份有限公司 | A kind of ammonium hydrogen carbonate recrystallization production method |
| CN108128787B (en) * | 2018-01-13 | 2021-04-23 | 安徽金禾实业股份有限公司 | Ammonium bicarbonate recrystallization production method |
| CN108358220A (en) * | 2018-03-07 | 2018-08-03 | 武汉德泽环保科技有限公司 | A kind of method and apparatus producing sodium bicarbonate |
| CN108358220B (en) * | 2018-03-07 | 2023-05-23 | 武汉德泽环保科技有限公司 | Method and device for producing baking soda |
| CN109761248A (en) * | 2019-03-12 | 2019-05-17 | 谢精忠 | Sodium bicarbonate preparation facilities and preparation method |
| CN109761248B (en) * | 2019-03-12 | 2021-02-26 | 谢精忠 | Baking soda preparation device and preparation method |
| CN111977673A (en) * | 2020-07-29 | 2020-11-24 | 山东海天生物化工有限公司 | Production process of baking soda |
| CN112777613A (en) * | 2021-01-29 | 2021-05-11 | 山东海天生物化工有限公司 | Process method for improving grain size of carbonization reaction material in carbonization tower in soda production |
| CN113244753A (en) * | 2021-05-18 | 2021-08-13 | 宝武水务科技有限公司 | Flue gas carbon dioxide recovery and resource utilization device and method |
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| CN104402023B (en) | 2016-08-31 |
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