CN104495903A - Method for producing highly pure anhydrous calcium chloride in high attitude regions - Google Patents
Method for producing highly pure anhydrous calcium chloride in high attitude regions Download PDFInfo
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- CN104495903A CN104495903A CN201410692296.8A CN201410692296A CN104495903A CN 104495903 A CN104495903 A CN 104495903A CN 201410692296 A CN201410692296 A CN 201410692296A CN 104495903 A CN104495903 A CN 104495903A
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- calcium chloride
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- evaporation
- fluidized bed
- chloride solution
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/30—Concentrating; Dehydrating; Preventing the adsorption of moisture or caking
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/32—Purification
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Fertilizers (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for producing highly pure anhydrous calcium chloride by recycling an ammonia-soda process waste liquid through using the natural conditions of high attitude regions and through combining solar evaporation with triple effect evaporation and a fluidized bed spray granulation technology. The method recycling tail gas generated in the fluidized bed spray granulation technology in the process has the advantages of resource waste reduction, production efficiency increase, simple technology and good product quality.
Description
Technical field
The present invention relates to technical field of salt chemical industry, especially a kind of high altitude localities produces the method for high-purity anhydrous calcium chloride.
Background technology
Along with the fast development of west, sea industry, Hai Xizhou area alkali factory of large bavin dawn output increases year by year, the soda factory of current four ammonia-soda process, and year output reaches 4,000,000 tons, year discharge waste soda ash solution 40,000,000 cubes.The discharge not only contaminate environment of a large amount of waste liquid, also causes the waste of waste resource.These waste liquids are made full use of, turns waste into wealth, for making contributions for Qaidam development & construction again while enterprise's creation interests.
Large bavin dawn area belongs to typical land plateau desert climate, and the four seasons are failed to understand, ultraviolet is strong, and drought, average annual precipitation is low.Because high atmospheric pressure above sea level is low, the Calcium Chloride Powder Anhydrous xln granular size of production differs, and xln hardness is inadequate, and transport for long-distance frangible, profile unsightly, affects production marketing, particularly exported product, is difficult to enter world market.Again due to the reason such as temperature decline and air pressure in production process, usually cause product quality not reach national standard, can only Calcium dichloride dihydrate be produced.
Since development of the West Regions, to Qaidam country development area, exploit resources of salt lakes fully utilizes, it is the content that governments at all levels pay close attention to always, for complying with the demand for development of recycling economy test site, Qaidam, develop actively recycling economy, finds one to realize resource recycling, alleviate on the pollution of local environment and the solution of impact extremely urgent.
Fluidized bed spray granulation solution, suspension or fused solution is sprayed in the fluidized-bed bed of drying or incomplete dried particles, and in same equipment, a step completes the granulation process of evaporation, crystallization, drying or chemical reaction.Fluidized bed prilling operation is not high to the size of particle, shape need, the product obtained without caking, there is good flowing property.Agglomeration technique has been widely used in the industrial production such as medicine, chemical industry, chemical fertilizer, controls suitable processing condition, can obtain the product of required different grain size, shape and requirement of strength.In current many prilling process, fluidized bed prilling has caused the extensive concern of people, its outstanding feature be the processes such as integrated grain, mixing, drying, compared with the prilling process that other are traditional, there is the advantages such as technical process is simple, equipment configuration is compact, reduced investment, production intensity are large, and the product obtained is ashless, without block, have good flowing property.
The spent air temperture that fluidized bed spray granulation technique terminates rear generation is very high, carries more heat transfer.But current most of manufacturer does not pay attention to some extent to this, be all directly discharge after dedusting substantially, this is a kind of wasting of resources greatly in today of energy growing tension.
Summary of the invention
The object of the present invention is to provide one to be applicable to high altitude localities, utilize triple effect evaporation and atomizing granulating technology to carry out resource recycling to ammonia-soda process waste liquid, produce the method for high-purity anhydrous calcium chloride.
Object of the present invention is realized by following technical scheme:
High altitude localities produces a method for high-purity anhydrous calcium chloride, comprises the following steps:
(1) ammonia-soda process waste liquid is concentrated into the calcium chloride solution that concentration is 22 ~ 25% tedding pond solar evaporation, now separates out partial oxidation sodium particle;
(2) utilize triple effect evaporation technique by concentration be 22 ~ 25% calcium chloride solution be dewatered to about 40% concentration, and centrifugation separate out sodium chloride particle, now for evaporation finished fluid;
(3) preheating of fluidized bed spray granulation process tail gas is utilized will to evaporate finished product fluid dewatering to more than 45% concentration;
(4) fluidized bed spray granulation technique is utilized the calcium chloride solution of more than 45% concentration to be made the anhydrous spherical calcium chloride finished product being not less than 94%.
Preferably, in above-mentioned steps (2), in evaporation finished fluid, other impurity should control below 3%;
Compared to existing technology, the present invention has the following advantages:
1, utilize land plateau desert climate, to ammonia-soda process waste liquid recycling, turn waste into wealth, save energy;
2, change traditional single-action, double-effect evaporation technique is triple effect evaporation technique, reduce steam consumption, energy-saving effect is remarkable;
3, the tail gas utilizing fluidized bed spray granulation technique to terminate rear generation carries out preheating to evaporation finished fluid, reduces the wasting of resources, enhances productivity;
4, mature production technology is simple, easy handling.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
1 describe the present invention by reference to the accompanying drawings:
As shown in the figure, because large bavin dawn area belongs to typical land plateau desert climate, ultraviolet is strong, drought, light application time is long, intensity is large, so first ammonia-soda process waste liquid (concentration is the calcium chloride solution of about the 15%) scene of transporting to that alkali factory produces is tedded pond and tedded, solar evaporation enters triple-effect evaporator after being concentrated into 22.8-25.1%, make full use of the recycling of heat energy by secondary steam, reduce the consumption of steam.Calcium chloride solution after concentrate is dewatered to 40-45% concentration, and the saturated precipitation of sodium chloride particle, utilizes whizzer to be separated, and the calcium chloride solution now obtained is evaporation finished fluid.Evaporation finished fluid is atomized by liquid pump and spray gun, directly enters pelleting main machine, and directly contact in fluidized-bed inside with high temperature air, after the atomization of liquid, dry contact area increases more than 1000 times, carries out strong heat and mass, obtains 94% anhydrous spherical calcium chloride.
Above-mentioned technology utilization natural environmental condition, greatly enhances thermo-efficiency, reduces production cost.
Claims (2)
1. high altitude localities produces a method for high-purity anhydrous calcium chloride, it is characterized in that described method comprises the following steps:
Ammonia-soda process waste liquid is concentrated into the calcium chloride solution that concentration is 22 ~ 25% tedding pond solar evaporation, now separates out partial oxidation sodium particle;
Utilize triple effect evaporation technique by concentration be 22 ~ 25% calcium chloride solution be dewatered to about 40% concentration, and centrifugation separate out sodium chloride particle, the calcium chloride solution obtained for evaporation finished fluid;
Utilize the preheating of fluidized bed spray granulation process tail gas will evaporate finished product fluid dewatering to more than 45% concentration;
Fluidized bed spray granulation technique is utilized the calcium chloride solution of more than 45% concentration to be made the anhydrous spherical calcium chloride finished product being not less than 94%.
2. a kind of high altitude localities produces the method for high-purity anhydrous calcium chloride according to claim 1, it is characterized in that: in step (2), in evaporation finished fluid, other impurity should control below 3%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692296.8A CN104495903A (en) | 2014-11-27 | 2014-11-27 | Method for producing highly pure anhydrous calcium chloride in high attitude regions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692296.8A CN104495903A (en) | 2014-11-27 | 2014-11-27 | Method for producing highly pure anhydrous calcium chloride in high attitude regions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104495903A true CN104495903A (en) | 2015-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410692296.8A Pending CN104495903A (en) | 2014-11-27 | 2014-11-27 | Method for producing highly pure anhydrous calcium chloride in high attitude regions |
Country Status (1)
| Country | Link |
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| CN (1) | CN104495903A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3184490A1 (en) * | 2015-12-25 | 2017-06-28 | Zhenxi Zhou | Method for recycling ammonia from low-concentration ammonium chloride wastewater |
| CN108178213A (en) * | 2017-12-30 | 2018-06-19 | 西安九环科技有限公司 | Calcium chloride wastewater is concentrated and dried thermal energy coupling device |
| CN109455751A (en) * | 2018-12-05 | 2019-03-12 | 安徽华塑股份有限公司 | The method that by-product hydrochloric acid and lime stone screenings prepare calcium chloride |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1354135A (en) * | 2000-11-16 | 2002-06-19 | 唐山三友志达钙业有限公司 | Non-scaling production method of calcium chloride by directly using waste liquor of ammonia-soda process and plate-type evaporator |
| CN101125673A (en) * | 2007-08-28 | 2008-02-20 | 唐山三友志达钙业有限公司 | Method for directly producing calcium chloride from ammonia-soda process waste liquid |
| CN101125674A (en) * | 2007-08-28 | 2008-02-20 | 唐山三友志达钙业有限公司 | Method for directly producing anhydrous spherical calcium chloride from ammonia-soda process waste liquid |
-
2014
- 2014-11-27 CN CN201410692296.8A patent/CN104495903A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1354135A (en) * | 2000-11-16 | 2002-06-19 | 唐山三友志达钙业有限公司 | Non-scaling production method of calcium chloride by directly using waste liquor of ammonia-soda process and plate-type evaporator |
| CN101125673A (en) * | 2007-08-28 | 2008-02-20 | 唐山三友志达钙业有限公司 | Method for directly producing calcium chloride from ammonia-soda process waste liquid |
| CN101125674A (en) * | 2007-08-28 | 2008-02-20 | 唐山三友志达钙业有限公司 | Method for directly producing anhydrous spherical calcium chloride from ammonia-soda process waste liquid |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3184490A1 (en) * | 2015-12-25 | 2017-06-28 | Zhenxi Zhou | Method for recycling ammonia from low-concentration ammonium chloride wastewater |
| CN108178213A (en) * | 2017-12-30 | 2018-06-19 | 西安九环科技有限公司 | Calcium chloride wastewater is concentrated and dried thermal energy coupling device |
| CN109455751A (en) * | 2018-12-05 | 2019-03-12 | 安徽华塑股份有限公司 | The method that by-product hydrochloric acid and lime stone screenings prepare calcium chloride |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150408 |