CN104628275A - Phosphogypsum calcining system and phosphogypsum calcining process - Google Patents
Phosphogypsum calcining system and phosphogypsum calcining process Download PDFInfo
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- CN104628275A CN104628275A CN201510052619.1A CN201510052619A CN104628275A CN 104628275 A CN104628275 A CN 104628275A CN 201510052619 A CN201510052619 A CN 201510052619A CN 104628275 A CN104628275 A CN 104628275A
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Abstract
The invention discloses a phosphogypsum calcining system and a phosphogypsum calcining process. The phosphogypsum calcining system comprises a suspension calcinator and a combustion chamber and further comprises a flash dryer, a left multi-stage cyclone separator and a right multi-stage cyclone separator, wherein the gas outlet of the combustion chamber is communicated with the air inlet pipe of the flash drier and the air inlet on the lower part of the suspension calcinator; a guide pipe of the flash drier is communicated with the feed hole of the right multi-stage cyclone separator; the discharge hole of the right multi-stage cyclone separator is communicated with the lateral feed hole of the suspension calcinatory; the discharge hole formed in the upper part of the suspension calcinatory is communicated with the feed hole of the left multi-stage cyclone separator; the discharge hole of the left multi-stage cyclone separator is connected with an air cooler; and the gas outlet of the left multi-stage cyclone separator is communicated with the air inlet pipe of the flash drier. The phosphogypsum calcining system disclosed by the invention has the advantages of high heat utilization rate, low energy consumption and high automation degree and is suitable for large-scale production.
Description
Technical field
The invention belongs to the process for processing technical field of phosphogypsum, particularly relate to a kind of phosphogypsum calcination system and technical process thereof.
Background technology
Phosphogypsum is a kind of industry by-product gypsum of producing when producing high-concentration phosphate compound fertilizers, and main component is terra alba, and the phosphogypsum that China discharges every year reaches 4000-7000 ten thousand tons, and utilization ratio only 10%, do not applied very well for a long time.Undressed phosphogypsum is stacked and is not only taken a large amount of soils, fund, waste a large amount of Sulphur ressource, and the impurity such as fluorochemical, free phosphoric acid, P2O5, phosphoric acid salt wherein can cause soil, water body, topsoil.Current most enterprises selects one piece of wasteland to store up the phosphogypsum slag produced, and has has not only occupied land resources, and rainy day pulp-water can be caused to overflow, and fine day dirt ash disorderly flies, and severe contamination environment.Phosphogypsum has become the bottleneck of phosphorous chemical industry sustainable development, and ardealite innocent is administered and fully utilized the study hotspot becoming municipal solid wastes disposal and resource utilization field.Industrial by-product phosphorus stone phosphogypsum is through airing ageing, and attached water content is 10 ~ 12%, and phosphogypsum can form fritter.The phosphogypsum calcination system adopted at present in addition and technical process thereof exist that energy consumption is high, the problem of unstable properties, dry and pulverization process effect is bad, are difficult to apply on a large scale.
Summary of the invention
The present invention, in order to solve the problems of the prior art, provides a kind of phosphogypsum calcination system and technical process thereof, and its thermal effect utilization ratio is high, energy consumption is low, and level of automation is high, is easy to large-scale production.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: phosphogypsum calcination system, it comprises suspension roaster and the combustion chamber with gas blower, it also comprises flash dryer, left multi-cyclone and right multi-cyclone, the bottom of flash dryer is provided with inlet pipe, the top of flash dryer is provided with guide pipe, the air outlet of combustion chamber is communicated with the inlet mouth of described suspension roaster bottom with the inlet pipe of flash dryer respectively, the guide pipe of flash dryer is communicated with the opening for feed of right multi-cyclone, the discharge port of right multi-cyclone is communicated with the side opening for feed of described suspension roaster, the discharge port on described suspension roaster top is communicated with the opening for feed of left multi-cyclone, the discharge port of left multi-cyclone is connected with air cooler, the air outlet of left multi-cyclone is communicated with the inlet pipe of flash dryer.
Described right multi-cyclone comprises multiple right cyclonic separator, the discharge port of the right cyclonic separator of higher level is all communicated with the side opening for feed of described suspension roaster with the discharge port of the right cyclonic separator of subordinate, and the air outlet of the right cyclonic separator of higher level is communicated with the opening for feed of the right cyclonic separator of subordinate; Described left multi-cyclone comprises multiple left cyclonic separator, the discharge port of the left cyclonic separator of higher level is all connected with described air cooler with the discharge port of the left cyclonic separator of subordinate, and the air outlet of the left cyclonic separator of higher level is communicated with the opening for feed of the left cyclonic separator of subordinate.
Described right multi-cyclone comprises the first right cyclonic separator and the second right cyclonic separator, the discharge port of the first right cyclonic separator is all communicated with the side opening for feed of described suspension roaster with the discharge port of the second right cyclonic separator, the air outlet of the first right cyclonic separator is communicated with the opening for feed of the second right cyclonic separator, and the opening for feed of the first right cyclonic separator is communicated with the guide pipe of described flash dryer; Described left multi-cyclone comprises the first left cyclonic separator and the second left cyclonic separator, the discharge port of the first left cyclonic separator is all connected with described air cooler with the discharge port of the second left cyclonic separator, the air outlet of the first left cyclonic separator is communicated with the opening for feed of the second left cyclonic separator, the opening for feed of the first left cyclonic separator is connected with the discharge port on described suspension roaster top, and the air outlet of the second left cyclonic separator is communicated with the inlet pipe of described flash dryer; The air outlet of described air cooler is communicated with the inlet pipe of described flash dryer.
The air outlet of described second right cyclonic separator is connected with bag filter, and bag filter is connected with induced draft fan.
Described flash dryer also comprises upper conical pipe and inferior pyramidal pipe, the upper end diameter of described upper conical pipe is greater than the lower end diameter of upper conical pipe, the upper end diameter of described inferior pyramidal pipe is less than the lower end diameter of inferior pyramidal pipe, the axial length of described upper conical pipe is greater than the axial length of described inferior pyramidal pipe, the lower end of described upper conical pipe is communicated with the upper end of described inferior pyramidal pipe, the upper end of described upper conical pipe is communicated with discharge nozzle, and the lower end of described upper conical pipe is communicated with described inlet pipe.
The top connection of described escape pipe is provided with described guide pipe, described guide pipe is made up of upper guiding straight tube and lower guiding tapered tube, the lower end of described upper guiding straight tube is communicated with the upper end of described lower guiding tapered tube, the lower end of described lower guiding tapered tube is communicated with described discharge nozzle, and the upper end diameter of described lower guiding tapered tube is less than the lower end diameter of lower guiding tapered tube.
Described discharge nozzle and inlet pipe are straight tube; The central axes of described upper conical pipe, inferior pyramidal pipe, inlet pipe, discharge nozzle, upper guiding straight tube and lower guiding tapered tube.
The sidewall of described upper conical pipe offers dryer feed mouth.
The dryer feed mouth place of described flash dryer is provided with belt feeder, and the discharge port of belt feeder is communicated with described dryer feed mouth.
Another object of the present invention is to provide a kind of technical process of phosphogypsum calcination system, carries out according to the following steps successively:
1) compound pre-homogenizing flow process: add in the industrial by-product phosphogypsum material of attached water content 10 ~ 12% after natural drying ageing unslaked lime and flyash two mix composite modified, then through homogenization device pre-treatment, make its feed purity and proterties even;
2) suspension preheating dries flow process: the secondary waste heat wind that the part that combustion chamber produces by gas blower hot blast and the second left cyclonic separator reclaim enters flash dryer, material after step one processes enters flash dryer through belt feeder, directly contact with the hot blast in flash dryer, pulse flicker is dry, sloughs most of attached water;
3) suspension calcining flow process: the hot blast after flash dryer heat exchange carries phosphogypsum material and enters right multi-cyclone, enter through the isolated material of right multi-cyclone another part hot blast that suspension roaster and combustion chamber produce to be fired to after material reaches suitable crystalline water-content through suspension heat exchange and to overflow with hot blast, after right multi-cyclone is separated, hot blast enters bag filter dedusting, by induced draft fan in discharge, gather the material got off in bag filter and be again back in flash dryer and process;
4) fluidisation cooling process: the hot blast after calcining heat exchange by suspension roaster enters left multi-cyclone with the material overflowed, and lowers the temperature together through the isolated material of left multi-cyclone through air cooler;
5) grinding modification flow process: the material after cooling enters grinder and carries out grating grinding, after making gypsum powder reach predetermined crystalline structure and fineness, discharging enters finished bin.
In the present invention, the beneficial effect of system is:
(1) cooperation of suspension roaster, combustion chamber, flash dryer, left multi-cyclone and right multi-cyclone, achieve the whole system of phosphogypsum calcining, and thermal effect utilization ratio is high, energy consumption is low, energy-conserving and environment-protective, level of automation is high; The air outlet of the second right cyclonic separator is connected with bag filter, bag filter is connected with induced draft fan, after right multi-cyclone is separated, hot blast enters bag filter dedusting, by induced draft fan in discharge, gather the material got off in bag filter and be again back in flash dryer and process; The structure design of left multi-cyclone and right multi-cyclone can carry out multistage, cyclic drying to moisture phosphogypsum, makes full use of the energy of hot blast, improves drying efficiency, ensures drying effect; The air outlet of the second left cyclonic separator is communicated with the inlet pipe of described flash dryer, and the air outlet of described air cooler is communicated with the inlet pipe of described flash dryer, improves energy utilization efficiency, energy-conserving and environment-protective.
(2) hot gas flow that produces of combustion chamber after the entering of the inlet pipe of flash dryer through inferior pyramidal pipe, upper end diameter due to inferior pyramidal pipe is less than the lower end diameter of inferior pyramidal pipe, the air-flow velocity on inferior pyramidal pipe top is caused to be accelerated, air-flow after acceleration enters into upper conical pipe, upper end diameter due to upper conical pipe is greater than the lower end diameter of upper conical pipe, the air-flow velocity on upper conical pipe top is caused to reduce, upper conical pipe is entered from the moisture phosphogypsum of dryer feed mouth feeding, moisture phosphogypsum is under gravity toward falling, when it falls into the upper end of inferior pyramidal pipe, because the air-flow velocity of inferior pyramidal pipe upper end is larger, moisture phosphogypsum is upwards with by the high velocity air that this place sprays into, when moisture phosphogypsum upwards supreme tapered tube top time, because the air-flow velocity on upper conical pipe top is lower, moisture phosphogypsum is again under gravity toward falling, through the repetitive process risen several times and fall, attached water in phosphogypsum is evaporated by hot gas flow, phosphogypsum not containing attached water is upwards taken away through discharge nozzle and guide pipe by air-flow, thus complete drying process, the top connection of escape pipe is provided with guide pipe, described guide pipe is made up of upper guiding straight tube and lower guiding tapered tube, this structure design makes the phosphogypsum not containing attached water after entering into guide pipe place through discharge nozzle, phosphogypsum completes under the oblique sidewall effect of lower guiding tapered tube to be gathered, by upper guiding straight tube to going out, prevent phosphogypsum from dispersing everywhere, discharge nozzle and inlet pipe are straight tube, are convenient to install, and reduce manufacturing cost, the central axes of upper conical pipe, inferior pyramidal pipe, inlet pipe, discharge nozzle, upper guiding straight tube and lower guiding tapered tube, this structure design can reduce the loss of hot gas flow in the present invention, the sidewall of upper conical pipe offers dryer feed mouth, the setting of this dryer feed mouth position, be convenient to the drying that suspends, improve drying efficiency, ensure drying effect.
(3) native system is compared with conventional calcination system, the cooperation of suspension roaster, combustion chamber, flash dryer, left multi-cyclone and right multi-cyclone, can better homogenizing material, so that realize suspend control and the thermal exchange of material in multi-cyclone, better realize heat exchange and the mixing of material, optimize drying effect, improve drying efficiency, stablize materials quality, finished product efficiency and output is corresponding improve also.
The beneficial effect of technical process in the present invention: the cooperation of the pre-homogenizing flow process of compound, suspension preheating oven dry flow process, suspension calcining flow process, fluidisation cooling process and grinding modification flow process in technical process; thermal effect utilization ratio is high, energy consumption is low; be easy to large-scale production; level of automation is high; also three-waste free discharge; energy-conserving and environment-protective, and the plaster of Paris purity of producing is high, performance good.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of flash dryer in the present invention.
Embodiment
(in Fig. 1, solid arrow represents flow direction of material as depicted in figs. 1 and 2, dotted arrow represents gas flow), the present invention includes phosphogypsum calcination system, it comprises suspension roaster 9 and the combustion chamber 17 with gas blower 18, it also comprises flash dryer 8, left multi-cyclone 11 and right multi-cyclone 10, the bottom of flash dryer 8 is provided with inlet pipe 6, the top of flash dryer 8 is provided with guide pipe, the air outlet of combustion chamber 17 is communicated with the inlet mouth of described suspension roaster 9 bottom with the inlet pipe 6 of flash dryer 8 respectively, the guide pipe of flash dryer 8 is communicated with the opening for feed of right multi-cyclone 10, the discharge port of right multi-cyclone 10 is communicated with the side opening for feed of described suspension roaster 9, the discharge port on described suspension roaster 9 top is communicated with the opening for feed of left multi-cyclone 11, each discharge port of left multi-cyclone 11 is connected with air cooler 12 respectively, the air outlet of left multi-cyclone 11 is communicated with the inlet pipe 6 of flash dryer 8.
Described right multi-cyclone 10 comprises the first right cyclonic separator P1 and the second right cyclonic separator P2, the discharge port of the first right cyclonic separator P1 is all communicated with the side opening for feed of described suspension roaster 9 with the discharge port of the second right cyclonic separator P2, the air outlet of the first right cyclonic separator P1 is communicated with the opening for feed of the second right cyclonic separator P2, the opening for feed of the first right cyclonic separator P1 is communicated with the guide pipe of described flash dryer 8, the air outlet of the second right cyclonic separator C2 is connected with bag filter 14, bag filter 14 is connected with induced draft fan 15.
Described left multi-cyclone 11 comprises the first left cyclonic separator C1 and the second left cyclonic separator C2, the discharge port of the first left cyclonic separator C1 is all connected with described air cooler 12 with the discharge port of the second left cyclonic separator C2, the air outlet of the first left cyclonic separator C1 is communicated with the opening for feed of the second left cyclonic separator C2, the opening for feed of the first left cyclonic separator C1 is connected with the discharge port on described suspension roaster 9 top, and the air outlet of the second left cyclonic separator C2 is communicated with the inlet pipe 6 of described flash dryer 8; The air outlet of described air cooler 12 is communicated with the inlet pipe 6 of described flash dryer 8.
Described flash dryer 8 comprises upper conical pipe 4 and inferior pyramidal pipe 5, the sidewall of upper conical pipe 4 offers dryer feed mouth 7, dryer feed 7 mouthfuls of places are provided with belt feeder 19, the discharge port of belt feeder 19 is communicated with described dryer feed mouth 7, the upper end diameter D2 of described upper conical pipe 4 is greater than the lower end diameter D3 of upper conical pipe 4, the upper end diameter D3 of described inferior pyramidal pipe 5 is less than the lower end diameter D4 of inferior pyramidal pipe 5, the axial length L 3 of described upper conical pipe 4 is greater than the axial length L 4 of described inferior pyramidal pipe 5, the lower end of described upper conical pipe 4 is communicated with the upper end of described inferior pyramidal pipe 5, the upper end of described upper conical pipe 4 is communicated with discharge nozzle 3, the lower end of described inferior pyramidal pipe 5 is communicated with described inlet pipe 6, described discharge nozzle 3 and inlet pipe 6 are straight tube.
The top connection of described escape pipe 3 is provided with described guide pipe, described guide pipe is made up of upper guiding straight tube 1 and lower guiding tapered tube 2, the lower end of described upper guiding straight tube 1 is communicated with the upper end of described lower guiding tapered tube 2, the lower end of described lower guiding tapered tube 2 is communicated with described discharge nozzle 3, and the upper end diameter D1 of described lower guiding tapered tube 2 is less than the lower end diameter D2 of lower guiding tapered tube 2.The central axes of described upper conical pipe 4, inferior pyramidal pipe 5, inlet pipe 6, discharge nozzle 3, upper guiding straight tube 1 and lower guiding tapered tube 2.
Native system is compared with conventional calcination system, the cooperation of suspension roaster 9, combustion chamber 17, flash dryer 8, left multi-cyclone 11 and right multi-cyclone 10, can better homogenizing material, so that realize suspend control and the thermal exchange of material in multi-cyclone, better realize heat exchange and the mixing of material, optimize drying effect, improve drying efficiency, stablize materials quality, finished product efficiency and output is corresponding improve also.
The present embodiment also discloses the technical process of phosphogypsum calcination system, carries out according to the following steps successively:
1) compound pre-homogenizing flow process: add in the industrial by-product phosphogypsum material 16 of attached water content 10 ~ 12% after natural drying ageing unslaked lime and flyash two mix composite modified, then through homogenization device pre-treatment, make its feed purity and proterties even;
2) suspension preheating dries flow process: 150 DEG C of secondary waste heat wind that the part that combustion chamber 17 produces by gas blower 18 600 DEG C of hot blasts and the second left cyclonic separator C2 reclaim enter flash dryer 8, material 16 after step one processes enters flash dryer 8 through belt feeder 19, directly contact with the hot blast in flash dryer 8, pulse flicker is dry, sloughs most of attached water;
3) suspension calcining flow process: 300 DEG C of hot blasts after flash dryer 8 heat exchange carry phosphogypsum material 16 and enter right multi-cyclone 10, enter through the isolated material 16 of right multi-cyclone 10 another part 600 DEG C of hot blasts that suspension roaster 9 and combustion chamber 17 produce to be fired to after material reaches suitable crystalline water-content through suspension heat exchange and to overflow with hot blast, right multi-cyclone 10 is separated rear hot blast and enters bag filter 14 dedusting, by induced draft fan 15 in 100 DEG C of discharges, gather the material got off in bag filter 14 to be again back in flash dryer 8 and to process,
4) fluidisation cooling process: calcine 350 DEG C of hot blasts after heat exchange by suspension roaster 9 and enter left multi-cyclone 11 with the material overflowed, be cooled to 50 DEG C through air cooler 12 together through the isolated material of left multi-cyclone 11;
5) grinding modification flow process: the material 12 after cooling enters grinder and carries out grating grinding, and after making gypsum powder reach predetermined crystalline structure and fineness, discharging enters finished bin.
In described step one, homogenization device is the prior aries such as homogenizer; In described step 5, set different crystalline structure and fineness according to the purposes of gypsum, carry out grating grinding through grinder, after reaching predetermined crystalline structure and fineness, discharging enters finished bin.
Pulse flicker drying process in flash dryer 8 is, when hot blast from after inlet pipe 6 enters through inferior pyramidal pipe 5(Fig. 2 the direction of arrow represent the hot blast direction through flash dryer 8), upper end diameter D3 due to inferior pyramidal pipe 5 is less than the lower end diameter D4 of inferior pyramidal pipe 5, the air-flow velocity on inferior pyramidal pipe 5 top is caused to be accelerated, air-flow after acceleration enters into upper conical pipe 4, upper end diameter D2 due to upper conical pipe 4 is greater than the lower end diameter D3 of upper conical pipe 4, the air-flow velocity on upper conical pipe 4 top is caused to reduce, the moisture phosphogypsum fed from dryer feed mouth 7 enters upper conical pipe 4, moisture phosphogypsum is under gravity toward falling, when it falls into the upper end of inferior pyramidal pipe 5, because the air-flow velocity of inferior pyramidal pipe 5 upper end is larger, moisture phosphogypsum is upwards with by the high velocity air that this place sprays into, when moisture phosphogypsum upwards supreme tapered tube 4 top time, because the air-flow velocity on upper conical pipe 4 top is lower, moisture phosphogypsum is again under gravity toward falling, through the repetitive process risen several times and fall, attached water in phosphogypsum is evaporated by hot gas flow, containing the phosphogypsum of attached water by air-flow upwards through discharge nozzle 3, lower guiding tapered tube 2 and upper guiding straight tube 1 are taken away and are entered into right multi-cyclone 10.
The cooperation of the pre-homogenizing flow process of compound, suspension preheating oven dry flow process, suspension calcining flow process, fluidisation cooling process and grinding modification flow process in present invention process flow process; thermal effect utilization ratio is high, energy consumption is low; be easy to large-scale production; level of automation is high; also three-waste free discharge; energy-conserving and environment-protective, and the plaster of Paris purity of producing is high, performance good.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (10)
1. phosphogypsum calcination system, it comprises suspension roaster and the combustion chamber with gas blower, it is characterized in that: it also comprises flash dryer, left multi-cyclone and right multi-cyclone, the bottom of flash dryer is provided with inlet pipe, the top of flash dryer is provided with guide pipe, the air outlet of combustion chamber is communicated with the inlet mouth of described suspension roaster bottom with the inlet pipe of flash dryer respectively, the guide pipe of flash dryer is communicated with the opening for feed of right multi-cyclone, the discharge port of right multi-cyclone is communicated with the side opening for feed of described suspension roaster, the discharge port on described suspension roaster top is communicated with the opening for feed of left multi-cyclone, the discharge port of left multi-cyclone is connected with air cooler, the air outlet of left multi-cyclone is communicated with the inlet pipe of flash dryer.
2. phosphogypsum calcination system according to claim 1, it is characterized in that: described right multi-cyclone comprises multiple right cyclonic separator, the discharge port of the right cyclonic separator of higher level is all communicated with the side opening for feed of described suspension roaster with the discharge port of the right cyclonic separator of subordinate, and the air outlet of the right cyclonic separator of higher level is communicated with the opening for feed of the right cyclonic separator of subordinate; Described left multi-cyclone comprises multiple left cyclonic separator, the discharge port of the left cyclonic separator of higher level is all connected with described air cooler with the discharge port of the left cyclonic separator of subordinate, and the air outlet of the left cyclonic separator of higher level is communicated with the opening for feed of the left cyclonic separator of subordinate.
3. phosphogypsum calcination system according to claim 2, it is characterized in that: described right multi-cyclone comprises the first right cyclonic separator and the second right cyclonic separator, the discharge port of the first right cyclonic separator is all communicated with the side opening for feed of described suspension roaster with the discharge port of the second right cyclonic separator, the air outlet of the first right cyclonic separator is communicated with the opening for feed of the second right cyclonic separator, and the opening for feed of the first right cyclonic separator is communicated with the guide pipe of described flash dryer; Described left multi-cyclone comprises the first left cyclonic separator and the second left cyclonic separator, the discharge port of the first left cyclonic separator is all connected with described air cooler with the discharge port of the second left cyclonic separator, the air outlet of the first left cyclonic separator is communicated with the opening for feed of the second left cyclonic separator, the opening for feed of the first left cyclonic separator is connected with the discharge port on described suspension roaster top, and the air outlet of the second left cyclonic separator is communicated with the inlet pipe of described flash dryer; The air outlet of described air cooler is communicated with the inlet pipe of described flash dryer.
4. phosphogypsum calcination system according to claim 3, is characterized in that: the air outlet of described second right cyclonic separator is connected with bag filter, and bag filter is connected with induced draft fan.
5. the phosphogypsum calcination system according to any one of claim 1-3, it is characterized in that: described flash dryer also comprises upper conical pipe and inferior pyramidal pipe, the upper end diameter of described upper conical pipe is greater than the lower end diameter of upper conical pipe, the upper end diameter of described inferior pyramidal pipe is less than the lower end diameter of inferior pyramidal pipe, the axial length of described upper conical pipe is greater than the axial length of described inferior pyramidal pipe, the lower end of described upper conical pipe is communicated with the upper end of described inferior pyramidal pipe, the upper end of described upper conical pipe is communicated with discharge nozzle, the lower end of described upper conical pipe is communicated with described inlet pipe.
6. phosphogypsum calcination system according to claim 5, it is characterized in that: the top connection of described escape pipe is provided with described guide pipe, described guide pipe is made up of upper guiding straight tube and lower guiding tapered tube, the lower end of described upper guiding straight tube is communicated with the upper end of described lower guiding tapered tube, the lower end of described lower guiding tapered tube is communicated with described discharge nozzle, and the upper end diameter of described lower guiding tapered tube is less than the lower end diameter of lower guiding tapered tube.
7. phosphogypsum calcination system according to claim 6, is characterized in that: described discharge nozzle and inlet pipe are straight tube; The central axes of described upper conical pipe, inferior pyramidal pipe, inlet pipe, discharge nozzle, upper guiding straight tube and lower guiding tapered tube.
8. phosphogypsum calcination system according to claim 7, is characterized in that: the sidewall of described upper conical pipe offers dryer feed mouth.
9. phosphogypsum calcination system according to claim 8, is characterized in that: the dryer feed mouth place of described flash dryer is provided with belt feeder, and the discharge port of belt feeder is communicated with described dryer feed mouth.
10. use the technical process of the phosphogypsum calcination system described in claim 9, it is characterized in that carrying out according to the following steps successively:
1) compound pre-homogenizing flow process: add in the industrial by-product phosphogypsum material of attached water content 10 ~ 12% after natural drying ageing unslaked lime and flyash two mix composite modified, then through homogenization device pre-treatment, make its feed purity and proterties even;
2) suspension preheating dries flow process: the secondary waste heat wind that the part that combustion chamber produces by gas blower hot blast and the second left cyclonic separator reclaim enters flash dryer, material after step one processes enters flash dryer through belt feeder, directly contact with the hot blast in flash dryer, pulse flicker is dry, sloughs most of attached water;
3) suspension calcining flow process: the hot blast after flash dryer heat exchange carries phosphogypsum material and enters right multi-cyclone, enter through the isolated material of right multi-cyclone another part hot blast that suspension roaster and combustion chamber produce to be fired to after material reaches suitable crystalline water-content through suspension heat exchange and to overflow with hot blast, after right multi-cyclone is separated, hot blast enters bag filter dedusting, by induced draft fan in discharge, gather the material got off in bag filter and be again back in flash dryer and process;
4) fluidisation cooling process: the hot blast after calcining heat exchange by suspension roaster enters left multi-cyclone with the material overflowed, and lowers the temperature together through the isolated material of left multi-cyclone through air cooler;
5) grinding modification flow process: the material after cooling enters grinder and carries out grating grinding, after making gypsum powder reach predetermined crystalline structure and fineness, discharging enters finished bin.
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| CN107651870A (en) * | 2017-11-07 | 2018-02-02 | 河南建筑材料研究设计院有限责任公司 | A kind of suspension air-flowing type ardealite integrated treatment unit and method |
| CN110156359A (en) * | 2019-06-17 | 2019-08-23 | 长沙紫宸科技开发有限公司 | With the method for dry-process rotary kilns factory transition consumption ardealite producing building land plaster |
| CN112028511A (en) * | 2020-09-10 | 2020-12-04 | 合肥水泥研究设计院有限公司 | Calcination dehydration method of phosphogypsum |
| CN116063014A (en) * | 2021-11-04 | 2023-05-05 | 中国科学院过程工程研究所 | Phosphogypsum fluidization roasting device and method |
| CN116354631A (en) * | 2023-04-03 | 2023-06-30 | 宁夏博得石膏研究院(有限公司) | Efficient hot air mixing heat exchange type one-step gypsum calcination system and process |
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| CN107651870A (en) * | 2017-11-07 | 2018-02-02 | 河南建筑材料研究设计院有限责任公司 | A kind of suspension air-flowing type ardealite integrated treatment unit and method |
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| CN116063014A (en) * | 2021-11-04 | 2023-05-05 | 中国科学院过程工程研究所 | Phosphogypsum fluidization roasting device and method |
| CN116354631A (en) * | 2023-04-03 | 2023-06-30 | 宁夏博得石膏研究院(有限公司) | Efficient hot air mixing heat exchange type one-step gypsum calcination system and process |
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