CN109701344A - A kind of recycling of calcined by rotary kiln flue gas, purification method - Google Patents
A kind of recycling of calcined by rotary kiln flue gas, purification method Download PDFInfo
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- CN109701344A CN109701344A CN201910009550.2A CN201910009550A CN109701344A CN 109701344 A CN109701344 A CN 109701344A CN 201910009550 A CN201910009550 A CN 201910009550A CN 109701344 A CN109701344 A CN 109701344A
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Abstract
The present invention is suitable for clarifying smoke field, disclose recycling, the purification method of a kind of calcined by rotary kiln flue gas, including absorption step and recycling step, wherein, absorption step includes that the high-temperature tail gas of rotary kiln discharge is successively passed through preheating machine, deduster, scrubbing tower, cooling tail gas is obtained after drying using the heat of high-temperature tail gas to the phosphorus ore in preheating machine, cooling tail gas enters back into after deduster carries out dust separation and obtains dedusting tail gas and dust, and dedusting tail gas obtains washing tail gas and scrub raffinate after entering the washed liquid washing of scrubbing tower；Recycling step includes the recycling and reusing to the dust, the washing tail gas and the scrub raffinate, dust is first sent into dust stock tank again, scrub raffinate is successively after subsider, the dust again stock tank, leaching slot processing, de-magging phosphorus concentrate is obtained by filter press filters pressing, and tail gas will be washed as the raw material of production miemite product.The present invention efficient, high quality can carry out reclaiming clean to calcined by rotary kiln tail gas.
Description
Technical field
The invention belongs to clarifying smoke field more particularly to a kind of recycling of calcined by rotary kiln flue gas, purification method.
Background technique
Kiln-process phosphoric acid production does not consume sulfuric acid, and comprehensive energy consumption is low, can directly produce high-quality phosphoric acid, can avoid ardealite
Problem is handled, and can solve the problem of China's Sulphur ressource deficiency, is a kind of advanced phosphoric acid production method.Country's kiln method at present
Phosphoric acid production has two kinds of main techniques of tunnel furnace method and kiln process, and the high-temperature kiln gas of both production technologies is all directly to intake
It closes absorption tower and absorbs preparing phosphoric acid.Because the high-temperature kiln gas come out out of kiln carries a large amount of heat and contains a large amount of dust, in order to keep away
Exempt from the waste of energy and the direct emission pollution environment of high-temperature kiln gas, reclaiming clean need to be carried out to high-temperature kiln gas, make high-temperature kiln gas
Middle dust and harmful substance contents just can be carried out discharge after reaching standard.Application No. is a kind of high temperature of CN200810233472.6
The thermal energy of kiln gas recycles and purification method, using high-temperature kiln gas obtained in producing kiln-process phosphoric acid, be passed through high-temperature heat-exchanging with
The middle cryogenic gas being passed through simultaneously carries out septate heat transfer, and kiln gas temperature drops to 500-850 DEG C, and middle cryogenic gas is heated to 600-
800 DEG C for preheating in kiln and phosphorous vapor oxidation gas or the combustion-supporting gas of heating；Kiln gas after cooling enters scrubber, addition
Process water and tail gas washing liquid carry out washing, purifying, and the clean kiln gas after washing cooling enters hydration absorption tower preparing phosphoric acid, tail
It is discharged after the purified qualification of gas；The qualified cleaning solution part that kiln gas circulation washing, purifying obtains is taken out, and purification separation, purification are carried out
Obtained residue is for producing chemical fertilizer or making the adhesive etc. of base.It purifies obtained clear liquid and is used as hydration absorption tower replenisher.
Although reclaiming clean effectively can be carried out to high-temperature kiln gas, the efficiency that it recycles high-temperature kiln gas is lower, causes part
The waste of resource does not meet the requirement of resources sustainable development.
Summary of the invention
The present invention is directed at least solve one of above-mentioned technical problem, a kind of recycling, net of calcined by rotary kiln flue gas is provided
Change method efficient, high quality can carry out reclaiming clean to calcined by rotary kiln tail gas.
The technical scheme is that a kind of recycling of calcined by rotary kiln flue gas, purification method, including absorption step and return
Receive step, wherein the absorption step includes that the high-temperature tail gas of rotary kiln discharge is successively passed through preheating machine, deduster, washing
Tower, obtained after being dried using the heat of high-temperature tail gas to the phosphorus ore in the preheating machine cooling tail gas, cooling tail gas again into
Enter after the deduster carries out dust separation and obtain dedusting tail gas and dust, dedusting tail gas enters the washed liquid of the scrubbing tower and washes
Washing tail gas and scrub raffinate are obtained after washing；The recycling step includes to the dust, the washing tail gas and the washing
Dust is first sent into dust stock tank again by the recycling and reusing of waste liquid, and scrub raffinate successively passes through subsider, the dust is starched again
After slot, leaching slot processing, de-magging phosphorus concentrate is obtained by filter press filters pressing, and regard washing tail gas as production miemite product
Raw material.
Optionally, cool down tail gas temperature be 150-180 DEG C.
Optionally, dedusting tail gas is first passed through scrubbing tower venturi before entering the scrubbing tower.
Optionally, cleaning solution is water or tail gas washing liquid.
Optionally, scrub raffinate settles to obtain sedimentation concentrated phase and supernatant through the subsider, and sedimentation concentrated phase is sent into institute
Dust stock tank again is stated, and is adjusted using PH of the nitric acid to slurry in the dust again stock tank, and supernatant flows back to described wash
Wash tower.
Optionally, the pH value of slurry is 1-2.5 to the dust in stock tank again.
Optionally, by the dust that pH value is 1-2.5, stock tank slurry is delivered to the leaching slot again, and uses nitric acid pair
The pH value of slurry is adjusted in the leaching slot.
Optionally, the pH value of slurry is 4.2-6.5 in the leaching slot.
Optionally, the leaching slot slurry that pH value is 4.2-6.5 sent to filter press progress filters pressing, washing, air-dried
It is used to produce liquid fertilizer or calcium ammonium nitrate magnesium products to de-magging phosphorus concentrate, and by the leaching liquid that the filter press is discharged.
Optionally, the concentration of the nitric acid is 50%-68%.
A kind of recycling of calcined by rotary kiln flue gas provided by the present invention, purification method, the high temperature tail in phosphorus ore calcining kiln
Gas successively passes through the purified treatment of preheating machine, deduster, scrubbing tower, and the heat in whole process, tail gas is fully used,
And phosphorus ore dust obtained in tail gas clean-up process, clean tail gas and filter press discharge leaching liquid etc. can be used as raw materials for production
It uses, the resource recycling rate effectively improved, accomplishes emission-free discharge, generated without waste water, waste residue, there is significant environmental protection effect
Benefit and economic benefit, meet the requirement of resources sustainable development.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the process flow chart of a kind of recycling of calcined by rotary kiln flue gas provided in an embodiment of the present invention, purification method.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be noted that term " setting ", " connection " shall be understood in a broad sense, for example, it may be directly setting, connection,
It can also be arranged indirectly by component placed in the middle, center configuration, be connected.
If in addition, have in the embodiment of the present invention "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal",
The term of the orientation or positional relationships of instructions such as "top", "bottom" "inner", "outside" is that orientation based on the figure or position are closed
System or conventional placement status or use state, are merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified structure, feature, device or element must have a particular orientation or positional relationship, nor is it necessary that with specific side
Position construction and operation, therefore be not considered as limiting the invention.In the description of the present invention, unless otherwise indicated, " more
It is a " it is meant that two or more.
Described each particular technique feature and each embodiment in a specific embodiment, in the case of no contradiction,
It can be combined in any appropriate way, such as can be with shape by different particular technique feature/embodiment combinations
At different embodiments, in order to avoid unnecessary repetition, each the various of particular technique feature/embodiment can in the present invention
No further explanation will be given for the combination of energy.
As shown in Figure 1, a kind of recycling of calcined by rotary kiln flue gas provided in an embodiment of the present invention, purification method, are applied to
The reclaiming clean of flue gas after phosphorus ore calcining, including absorption step and recycling step absorb the phosphorus ore dust in high-temperature tail gas, and will
It obtains phosphorus ore dust and tail gas recycle recycles, wherein absorption step includes successively being passed through the high-temperature tail gas of rotary kiln discharge
Preheating machine, deduster, scrubbing tower, high-temperature tail gas is passed through in preheating machine, using the heat in high-temperature tail gas in preheating machine
Phosphorus ore is dried, and obtains cooling tail gas and dry phosphorus ore, dry phosphorus ore enter rotary kiln and decompose through high-temperature calcination, and cooling tail gas enters
Deduster obtains dedusting tail gas and dust after carrying out dust separation, and dedusting tail gas is washed after entering the washed liquid washing of scrubbing tower
Tail gas and scrub raffinate are washed, recycling step includes the recycling and reusing to dust, washing tail gas and scrub raffinate, first by deduster
Obtained in dust be sent into dust again stock tank be made into slurry, scrub raffinate is admitted to dust stock tank again after subsider settles
Mix with its internal slurry, slurry is delivered to leaching slot again handles, is finally delivered to filter press progress filters pressing and obtain
De-magging phosphorus concentrate, while washing tail gas will be obtained in scrubbing tower as the raw material of production miemite product.Wherein cool down tail gas
Middle dust is acted on through deduster, and most of (about 90%) dust is separated, after the washed tower effect of the dust of remaining part
It is left, so that the content of dust is close to 0 in washing tail gas, it is ensured that use and wash the carbonic acid that tail gas is produced as raw material
The whiteness of calcium and magnesium product meets the requirements.Whole process, the heat in high-temperature tail gas can be effectively utilized in preheating machine, keep away
Exempt to cause the waste of thermal energy, and cools down tail gas after a series of subsequent processing, it can be efficiently by dust such as phosphorus ores from tail gas
In separate, and obtain clean tail gas and can be used as raw material for producing miemite product, accomplish emission-free discharge, and divide
The phosphorus ore dust and scrub raffinate separated out after processing, can be obtained de-magging phosphorus concentrate, phosphorus ore dust and scrub raffinate and produce through processing
For raw leaching liquid but also as calcium ammonium nitrate magnesium products or the raw material of liquid fertilizer, resource recycling rate is high, there is significant ring
Benefit and economic benefit are protected, the requirement of sustainable development is met.
Optionally, the temperature of tail gas of cooling down can be avoided the heat in tail gas from being wasted, can also be prevented for 150-180 DEG C
The exhaust temperature that cools down is excessively high, damages deduster.
Optionally, the temperature of cooling tail gas can be monitored, when the temperature for the tail gas that cools down is higher than preset temperature, is led to
Cross flue gas recirculation blower fan by cool down tail gas send back in the preheating machine, continue with cooling tail gas in thermal energy to rock phosphate in powder into
Row heating can will cool down until the temperature of cooling tail gas reaches setting value, and under the pressurization of flue gas recirculation blower fan
Tail gas sends back in the preheating machine, and cooling tail gas is avoided to scatter and disappear excessive thermal energy in transmission process.
Optionally, deduster is cyclone dust collectors, high dust collection efficiency, its working principle is that dust-contained airflow is made to make rotation fortune
It is dynamic, grit is separated to from air-flow by means of centrifugal force and is trapped in wall, then so that grit is fallen into ash bucket by gravity.Make
For another embodiment, deduster can also be sack cleaner.
Optionally, dedusting tail gas is first passed through scrubbing tower venturi before entering scrubbing tower, using Venturi effect, makes to dissipate
Dust of the cloth in tail gas and washing droplet surface contact, drop constantly capture the powder dust particle in tail gas and form mud drop, from
And scrubbing tower is improved to the adsorption capacity of dust in tail gas, improve the clean-up effect to tail gas.
Optionally, cleaning solution is water or tail gas washing liquid.
Optionally, scrub raffinate obtains sedimentation concentrated phase and supernatant after subsider natural subsidence, and sedimentation concentrated phase is sent into
Dust stock tank again, and the PH of slurry in dust again stock tank is adjusted using the nitric acid that concentration is 50%-68%, make dust again
The pH value of slurry is 1-2.5 in stock tank.Through insoluble matter can have been retained in the isolated phosphorus ore dust of deduster and sedimentation concentrated phase,
It can be dissolved under the action of nitric acid, the presence that can avoid insoluble matter will affect subsequent production procedure, lead to de-magging phosphorus concentrate
There is impurity, while supernatant flows back to scrubbing tower as cleaning solution, is recycled, reduces production cost.
Optionally, sedimentation concentrated phase is 1.5-3h with the time of nitric acid reaction in dust again stock tank.
Optionally, by dust that pH value is 1-2.5, stock tank slurry is delivered to leaching slot again, and the use of concentration is 50%-
The pH value of slurry in leaching slot is adjusted in 68% nitric acid, so that the pH value for leaching slurry in slot is adjusted to 4.2-6 weakly acidic,
Prevent dust again stock tank slurry acidity it is too strong, influence subsequent operation.
In practical application, leaching slot and the leaching slot phase in the next step of wet ball grinding in industrial phosphorus ore producing process
Together.
Optionally, the leaching slot slurry that pH value is 4.2-6 is sent to filter press and carries out filters pressing, washing, air-dried, can be obtained
De-magging phosphorus concentrate, and the leaching liquid of filter press discharge contains the ingredients such as nitrate ion, can be used as production liquid fertilizer or nitric acid
Ammonium calcium and magnesium particle, powdery fertilizer product.
In practical application, can demand according to market to different product, leaching liquid can also be reacted with washing tail gas
For producing miemite product.
In one embodiment, rock phosphate in powder with the charging rate of 16t/h through bucket elevator enter preheating machine heating, and by preheating machine into
Enter in rotary kiln and calcined, the temperature in rotary kiln is 950 DEG C, and the sustained combustion time is 2h, subsequent discharges into cooler progress
Cooling to obtain burnt ore, burnt ore enters after ball mill by wet process adds water for ball milling after the metering of belt weighing balance obtains phosphate ore pulp, opens
Phosphate ore pulp is delivered to leaching slot by pump.Wherein, rock phosphate in powder calcination process rotary kiln can generate high-temperature tail gas, and direct emission can pollute
Environment need to carry out purified treatment to high-temperature tail gas.Specific step is as follows: the high-temperature tail gas that rotary kiln tail portion is discharged is passed through preheating
Machine heats the phosphorus ore in preheating machine using the heat in high-temperature tail gas, and high-temperature tail gas carries out in preheating machine with phosphorus ore
After heat exchange, phosphorus ore temperature is increased, and the temperature of high-temperature tail gas is reduced to 150 DEG C of -180 DEG C of formation cooling tail gas, then will drop
Warm tail gas is passed through cyclone dust collectors, and dedusting tail gas is obtained under the action of cyclone dust collectors, 90% ground phosphate rock in the tail gas that cools down
Dirt is collected in wall because centrifugal force effect is separated and is captured from air-flow, falls into ash bucket by gravity phosphorus ore dust, ash
It is collected in bucket and obtains the phosphorus ore dust of about 400Kg, dust stock tank again is added in the phosphorus ore dust being collected into, scrub raffinate is added
Or water is made into phosphate ore pulp, and the dedusting tail gas that removes most of phosphorus ore dust is through enturi tube is passed through scrubbing tower, and uses technique
Water washs dedusting tail gas to obtain washing tail gas, and the phosphorus ore dust in dedusting tail gas obtains after being water cooled solidifying capture containing phosphorus
The scrub raffinate of miberal powder dirt, it is washed after washing tail gas in phosphorus ore dust content close to 0, can be used as production magnesium calcium carbonate
The whiteness of the raw material of product, obtained magnesium calcium carbonate product is high；Scrub raffinate is passed through subsider simultaneously, is separated through natural subsidence
Afterwards, the supernatant liquor of subsider flows back to scrubbing tower and is recycled as cleaning solution, and the concentrated phase of subsider lower layer is then conveyed
To dust, stock tank is mixed with the isolated phosphate ore pulp of cyclone dust collectors again, and the nitre that concentration is 62% is added in dust again stock tank
Acid, pH value of the dust again in stock tank become 1.5, and after reacted 2.5h, the phosphate ore pulp in dust again stock tank is delivered to leaching slot,
It is mixed with the phosphate ore pulp that wet ball grinding obtains, the nitric acid for reusing 62% adjusts the pH value for leaching phosphate ore pulp in slot, makes to leach slot
The pH value of interior phosphate ore pulp stabilizes to 5, will leach the phosphate ore pulp that pH value is 5 in slot using Pulp pump and be delivered to filter press progress filters pressing
Phosphorus ore filter cake is obtained, and phosphorus ore filter cake is washed using water (temperature is 50 DEG C -70 DEG C), with compressed air drying phosphorus ore filter
Then cake draws off phosphorus ore filter cake, phosphorus ore filter cake is de-magging phosphorus concentrate (P2O5 >=35%, MgO≤1.0%), and filter press is arranged
There are nitrate ion, calcium ion, magnesium ions etc. in leaching liquid out, can be used as the life of liquid fertilizer or calcium ammonium nitrate magnesium products
Produce raw material.
A kind of recycling of calcined by rotary kiln flue gas, purification method provided by the embodiment of the present invention, in phosphorus ore calcining kiln
High-temperature tail gas successively passes through the purified treatment of preheating machine, deduster, scrubbing tower, and the heat in whole process, tail gas is filled
Divide and utilize, and phosphorus ore dust obtained in tail gas clean-up process, clean tail gas and filter press discharge leaching liquid etc. can be used as life
It produces raw material to use, the resource recycling rate effectively improved, accomplishes emission-free discharge, generated without waste water, waste residue, had significant
Environmental benefit and economic benefit meet the requirement of resources sustainable development.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modification, equivalent replacement or improvement etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of recycling of calcined by rotary kiln flue gas, purification method, which is characterized in that including absorption step and recycling step,
In, the absorption step includes that the high-temperature tail gas of rotary kiln discharge is successively passed through preheating machine, deduster, scrubbing tower, utilizes height
The heat of warm tail gas obtains cooling tail gas after drying to the phosphorus ore in the preheating machine, cooling tail gas enters back into the dedusting
Device obtains dedusting tail gas and dust after carrying out dust separation, and dedusting tail gas is washed after entering the washed liquid washing of the scrubbing tower
Wash tail gas and scrub raffinate；The recycling step includes the recycling to the dust, the washing tail gas and the scrub raffinate
Recycle, dust be first sent into dust stock tank again, scrub raffinate successively pass through subsider, the dust again stock tank, at leaching slot
After reason, de-magging phosphorus concentrate is obtained by filter press filters pressing, and tail gas will be washed as the raw material of production miemite product.
2. a kind of recycling of calcined by rotary kiln flue gas as described in claim 1, purification method, which is characterized in that cooling tail gas
Temperature be 150-180 DEG C.
3. a kind of recycling of calcined by rotary kiln flue gas as described in claim 1, purification method, which is characterized in that dedusting tail gas
Scrubbing tower venturi is first passed through before entering the scrubbing tower.
4. a kind of recycling of calcined by rotary kiln flue gas as claimed in claim 3, purification method, which is characterized in that cleaning solution is
Water or tail gas washing liquid.
5. a kind of recycling of calcined by rotary kiln flue gas as described in claim 1, purification method, which is characterized in that scrub raffinate
It settles to obtain sedimentation concentrated phase and supernatant through the subsider, sedimentation concentrated phase is sent into dust stock tank again, and use nitric acid
The PH of slurry in the dust again stock tank is adjusted, and supernatant flows back to the scrubbing tower.
6. a kind of recycling of calcined by rotary kiln flue gas as claimed in claim 5, purification method, which is characterized in that the dust
The pH value of slurry is 1-2.5 in stock tank again.
7. a kind of recycling of calcined by rotary kiln flue gas as claimed in claim 6, purification method, which is characterized in that be by pH value
Stock tank slurry is delivered to the leaching slot to the dust of 1-2.5 again, and using nitric acid to the pH value of slurry in the leaching slot
It is adjusted.
8. a kind of recycling of calcined by rotary kiln flue gas as claimed in claim 7, purification method, which is characterized in that the leaching
The pH value of slurry is 4.2-6.5 in slot.
9. a kind of recycling of calcined by rotary kiln flue gas as claimed in claim 8, purification method, which is characterized in that be by pH value
The leaching slot slurry of 4.2-6.5 send to filter press carry out filters pressing, washing, it is air-dried obtain de-magging phosphorus concentrate, and by the pressure
The leaching liquid of filter discharge is for producing liquid fertilizer or calcium ammonium nitrate magnesium products.
10. a kind of recycling of calcined by rotary kiln flue gas as described in claim 5 or 7, purification method, which is characterized in that described
The concentration of nitric acid is 50%-68%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114620753A (en) * | 2021-11-29 | 2022-06-14 | 浙江天石纳米科技股份有限公司 | Low-carbon process method for producing light calcium carbonate by comprehensively utilizing chemical reaction heat |
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| CN114620753B (en) * | 2021-11-29 | 2023-08-18 | 浙江天石纳米科技股份有限公司 | Low-carbon process method for producing light calcium carbonate by comprehensively utilizing chemical reaction heat |
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