CN100519420C - Method for directly producing anhydrous spherical calcium chloride from ammonia-soda process waste liquid - Google Patents
Method for directly producing anhydrous spherical calcium chloride from ammonia-soda process waste liquid Download PDFInfo
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- CN100519420C CN100519420C CNB2007101393050A CN200710139305A CN100519420C CN 100519420 C CN100519420 C CN 100519420C CN B2007101393050 A CNB2007101393050 A CN B2007101393050A CN 200710139305 A CN200710139305 A CN 200710139305A CN 100519420 C CN100519420 C CN 100519420C
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- calcium chloride
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Abstract
The invention relates to a production method of calcium chloride, in particular to a method to directly produce anhydrous spherical calcium chloride with ammonia-soda process waste liquid. The method is that: calcium liquid containing about 50 percent of CaCl2 is sent to a dissolving tank by an evaporating truck to absorb system calcium fly and heated directly by primary steam to obtain more concentrated calcium liquid; after being filtered, the concentrated calcium liquid enters a fluidized bed prilling machine to inject and granulate, then is heated by hot air, evaporated and dried to obtain calcium granules more than or equal to 94.5 percent and the superfluous calcium liquid goes back to the dissolving tank; the calcium granules from the fluidized bed enter a screening machine through a screw conveyor, a bucket elevator and a vibration feeder to be two-stage screened, qualified granules enter finished product silo, comparatively larger granules enter the vibration feeder, are crushed by a roll crusher and sent to the fluidized bed by the screw conveyor and the small granules screened directly enter the screw conveyor and go back to the fluidized bed. The invention has simple process, convenient operation, high production efficiency and good quality.
Description
Technical field:
The present invention relates to the production method of calcium chloride, particularly a kind of method of utilizing fluidized bed pelletizer by ammonia-soda process waste liquid direct production anhydrous spherical calcium chloride.
Background technology:
At present, the calcium chloride product has two water, anhydrous, 74% sheet and several specifications of food grade, but based on two water and anhydrous, product mostly is sheet or bulk.Particularly anhydrous spherical calcium chloride output is seldom for spherical calcium chloride.The production method of tradition anhydrous spherical calcium chloride is to utilize shell and tube evaporator, elevated pressures production of steam, and complex process, production efficiency are low, poor product quality.
Summary of the invention:
Purpose of the present invention just is to overcome weak point of the prior art, and provides a kind of technology simple, the production efficiency height, and good product quality utilizes the method for fluidized bed pelletizer by ammonia-soda process waste liquid direct production anhydrous spherical calcium chloride.
The object of the present invention is achieved like this: a kind of method by ammonia-soda process waste liquid direct production anhydrous spherical calcium chloride the steps include:
(1) contains CaCl
2Calcium liquid about 50% is delivered to dissolving vessel by liquor evaporating plant, by the absorption system calcium powder, with giving birth to the steam direct heating, obtains the calcium liquid of further enrichment;
(2) after dense calcium liquid is delivered to the filtration of calcium liquid filter by liquid-feeding pump, enter the fluidized bed pelletizer air prilling, hot blast by the heating of direct-fired combustion chamber is admitted to fluidized bed pelletizer, to the heating of calcium liquid, evaporation, drying, make 〉=94.5% calcium chloride finished product, unnecessary calcium liquid returns dissolving vessel through calcium liquid circulation tube;
(3) spherical calcium chloride that comes out from fluidized bed pelletizer is delivered to chapelet by worm conveyor; enter sieve apparatus through vibratory feeder; sieve through secondary; the calcium grain that granularity is qualified is gone into finished product bin; after the fluidized bed cooler cooling; deliver to the finished product bin in packing post by the finished belt machine; the calcium grain that granularity is bigger enters vibratory feeder; turn back to fluidized bed pelletizer by worm conveyor behind the roll crushing crusher machine, the small-particle that sieves directly enters worm conveyor and turns back to fluidized bed pelletizer.
Compared to existing technology, the present invention has the following advantages:
1, technology is simple, and is easy to operate;
2, production efficiency height, output is big;
3, only need with a small amount of low-pressure steam calcium liquid to be incubated, steam consumption is few;
4, fluidized bed pelletizer adopts fully closed structure, and production intensity height, equipment take up an area of little, and material is heated evenly, and heat exchange is abundant, and the thermo-efficiency height is than domestic similar drying plant energy-conservation about 30%;
5, integrate drying, cooling and size classification, flow process is short, equipment is few and it is compact to arrange
6, ball calcium is pressed the strict screening of different grain size, and the underproof retrieval system circulation of granularity holds good security the granularity quality of finished product calcium chloride;
7, level of automation height, red-tape operati is simple and efficient, and equipment failure rate is low.
Description of drawings:
Fig. 1 is a process flow sheet of the present invention.
Embodiment:
Below in conjunction with drawings and Examples in detail the present invention is described in detail:
As shown in the figure, contain CaCl
2Calcium liquid about 50% is delivered to dissolving vessel by liquor evaporating plant, and feeding 0.5MPa steam is calcium liquid heat temperature raising, and the calcium liquid temp is reached more than 120 ℃, and the calcium powder that vacuum system is returned enters dissolving vessel and absorbs through the dissolving of calcium liquid, makes about calcium liquid enrichment to 62%.
Above-mentioned dense calcium liquid is delivered to the calcium liquid filter by liquid-feeding pump filter, enter the fluidized bed pelletizer air prilling afterwards.The calcium liquid that the tablets press shower nozzle ejects forms vaporific, and must adopt warm air to carry out drying this moment, removes the finished ball calcium that most of moisture content just can make content 〉=94.5%.Drying means is as follows: the coke-oven gas from the coke-oven plant enters the ignition of direct-fired combustion chamber after purifying treatment; the cold wind of sending into for fan heats; air themperature after the heating is controlled at about 450 ℃; this hot blast is admitted to fluidized bed pelletizer to the heating of calcium liquid, evaporation, drying; can make finished product calcium grain, unnecessary calcium liquid returns dissolving vessel through calcium liquid circulation tube.
Above-mentioned coal gas must be handled through cleaning and desulfurization before entering the combustion chamber, without the raw gas that desulfurizing and purifying is handled, and the sulphur content height, the burning back produces SO
2Easy damage equipment, polluted product, the while contaminate environment, so should select sweetening agent and cleaning process technology for use, the first step is carried out H earlier
2S slightly removes, and second step was carried out COS, CS
2Remove Deng the organosulfur essence.
Finished product calcium grain enters sieve apparatus through worm conveyor 1, chapelet, vibratory feeder 1 successively.Through the screen cloth screening, the product of different-grain diameter obtains separating: the calcium grain (2-4mm) that granularity is qualified enters finished product bin 1, after the fluidized bed cooler cooling, is delivered to the finished product bin 2 in packing post by the finished belt machine; Calcium the grain (〉 4mm that granularity is bigger) after entering the roll crushing crusher machine, vibratory feeder 2 turns back to fluidized bed pelletizer by worm conveyor 2; The small-particle that sieves (＜2mm) directly enter worm conveyor 2 and turn back to fluidized bed pelletizer.
Claims (1)
1, a kind of method by ammonia-soda process waste liquid direct production anhydrous spherical calcium chloride the steps include:
(1) contains CaCl
250% calcium liquid is delivered to dissolving vessel by liquor evaporating plant, by the absorption system calcium powder, with giving birth to the steam direct heating, obtains the calcium liquid of further enrichment;
(2) after dense calcium liquid is delivered to the filtration of calcium liquid filter by liquid-feeding pump, enter the fluidized bed pelletizer air prilling, hot blast by the heating of direct-fired combustion chamber is admitted to fluidized bed pelletizer, to the heating of calcium liquid, evaporation, drying, make 〉=94.5% calcium chloride finished product, unnecessary calcium liquid returns dissolving vessel through calcium liquid circulation tube;
(3) spherical calcium chloride that comes out from fluidized bed pelletizer is delivered to chapelet by worm conveyor; enter sieve apparatus through vibratory feeder; sieve through secondary; the spherical calcium chloride particle that granularity is qualified is gone into finished product bin; after the fluidized bed cooler cooling; deliver to the finished product bin in packing post by the finished belt machine; the spherical calcium chloride particle that granularity is bigger enters vibratory feeder; turn back to fluidized bed pelletizer by worm conveyor behind the roll crushing crusher machine, the spherical calcium chloride small-particle that sieves directly enters worm conveyor and turns back to fluidized bed pelletizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101393050A CN100519420C (en) | 2007-08-28 | 2007-08-28 | Method for directly producing anhydrous spherical calcium chloride from ammonia-soda process waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101393050A CN100519420C (en) | 2007-08-28 | 2007-08-28 | Method for directly producing anhydrous spherical calcium chloride from ammonia-soda process waste liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101125674A CN101125674A (en) | 2008-02-20 |
| CN100519420C true CN100519420C (en) | 2009-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101393050A Expired - Fee Related CN100519420C (en) | 2007-08-28 | 2007-08-28 | Method for directly producing anhydrous spherical calcium chloride from ammonia-soda process waste liquid |
Country Status (1)
| Country | Link |
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| CN (1) | CN100519420C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101367537B (en) * | 2008-09-12 | 2011-06-22 | 青海金锋实业有限公司 | Novel process for preparing spherical calcium chloride with spray of rotary kiln |
| CN102390855B (en) * | 2011-08-10 | 2014-07-30 | 重庆元和精细化工有限公司 | Production method of granular anhydrous strontium chloride |
| CN104495903A (en) * | 2014-11-27 | 2015-04-08 | 大柴旦吉利化工有限公司 | Method for producing highly pure anhydrous calcium chloride in high attitude regions |
| CN106477614A (en) * | 2016-09-30 | 2017-03-08 | 江苏海企技术工程股份有限公司 | A kind of method reducing anhydrous calcium chloride finished product temperature |
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2007
- 2007-08-28 CN CNB2007101393050A patent/CN100519420C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN101125674A (en) | 2008-02-20 |
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