CN210420086U - Roasting and acidifying system for lithium-phosphorus-aluminum - Google Patents
Roasting and acidifying system for lithium-phosphorus-aluminum Download PDFInfo
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- CN210420086U CN210420086U CN201921344645.1U CN201921344645U CN210420086U CN 210420086 U CN210420086 U CN 210420086U CN 201921344645 U CN201921344645 U CN 201921344645U CN 210420086 U CN210420086 U CN 210420086U
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Abstract
The utility model discloses a roasting acidification system of lithium-phosphorus-aluminum, which comprises a storage bin, an acid storage tank, an acid mixing machine, an acidification roasting rotary kiln, a grate cooler and a combustion system; the storage bin and the acid storage tank are respectively connected with an acid mixing machine, the acid mixing machine is connected with an acidification roasting rotary kiln, the acidification roasting rotary kiln is connected with a grate cooler, a heat recovery channel of the grate cooler is connected with a combustion system, and the combustion system provides a heat source for the acidification roasting rotary kiln; the combustion system is arranged on a heat recovery channel of the grate cooler, and hot air recovered by the grate cooler is fully mixed with a heat source generated by the combustion system and then enters the acidification roasting rotary kiln. The utility model discloses a lithium-phosphorus-aluminum-stone roasting acidification system adopts solitary hot-blast furnace to produce hot-blast heat and provides the heat source for the rotary kiln to the secondary air that the hot-air that will cool off the calcination material production is used as hot-blast furnace, the heat consumption of reduction system.
Description
Technical Field
The utility model relates to a roasting and acidifying technical field of operation lithium-phosphorus-aluminum-stone, in particular to a roasting and acidifying system for lithium-phosphorus-aluminum-stone.
Background
At present, the lithium salt for extracting spodumene in China is mainly roasted and acidified in a rotary kiln, and a spodumene acidified material is produced by adopting a process method of two-stage roasting and two-stage cooling and is used for extracting the lithium salt in the subsequent process. The process method of two-stage roasting and two-stage cooling has the following characteristics:
(1) the construction requires more materials and equipment, so the primary investment is large;
(2) the equipment is more and the operation is complex;
(3) the equipment is more, the maintenance workload is large, and the labor intensity of workers is high;
(4) the heat consumption is high, and different spodumene acidification roasting heat consumption is different, and is generally 800-1200 Kcal/Kg.
Therefore, it is urgently needed to provide a roasting acidification system with simple operation and low heat consumption, and reduce the equipment cost and the process cost of the lithium-phosphorus-aluminum alloy.
SUMMERY OF THE UTILITY MODEL
The utility model provides a to prior art, a lithium-phosphorus-aluminum-stone roasting acidification system, the hot-air recovery to the hot-blast furnace that produces the cooling arrangement, the lowering system energy consumption.
The utility model discloses a following technical scheme realizes: the lithium-phosphorus-aluminum-stone roasting acidification system comprises a storage bin, an acid storage tank, an acid mixing machine, an acidification roasting rotary kiln, a grate cooler and a combustion system; the storage bin and the acid storage tank are respectively connected with an acid mixing machine, the acid mixing machine is connected with an acidification roasting rotary kiln, the acidification roasting rotary kiln is connected with a grate cooler, a heat recovery channel of the grate cooler is connected with a combustion system, and the combustion system provides a heat source for the acidification roasting rotary kiln; the combustion system is arranged on a heat recovery channel of the grate cooler, and hot air recovered by the grate cooler is fully mixed with a heat source generated by the combustion system and then enters the acidification roasting rotary kiln.
And the hot air generated by the grate cooler is recycled and fully mixed with the heat generated by the combustion system to provide a heat source for the acidification roasting rotary kiln. The grate cooler cools and acidifies the roasted material by adopting natural air, and high-temperature gas obtained after heat exchange is used as a part of heat supply source of the roasting and acidification system and is fully mixed with heat generated by a combustion system, so that the fuel consumption of the combustion system can be effectively reduced, and the energy consumption is reduced.
Further, the acidification roasting rotary kiln comprises a furnace body and a rotary supporting device for supporting the furnace body; the furnace body comprises a rotary front section, a rotary heating section and a rotary discharging section which are connected in sequence; the rotary front section is connected with an acid mixing machine; the rotary discharging section is provided with a kiln hood cover, and the discharging end of the kiln hood cover is provided with a connecting grid and a distributing valve; the discharge end of the kiln head cover is connected with a grate type cooler; the kiln head cover is also provided with an air inlet, and the air inlet is connected with a combustion system. The rotary front section is provided with an air outlet, and hot air provided by the combustion system flows from the air inlet to the air outlet.
Furthermore, an inclined chain ring is arranged in the rotary front section, the mixed acid material is conveyed through the inclined chain ring, the heat transfer and material mixing effects are achieved, the temperature of the mixed acid material is rapidly increased in the rotary front section, and meanwhile the mixed acid material is not adhered to the inner surface of the acidification roasting rotary kiln.
Furthermore, the grate cooler comprises a cooling fan, an air chamber, a grate bed and a driving motor; the air chamber is positioned below the grate bed, and the cooling fan blows cold air into the air chamber; a feeding device is arranged on the grate bed; the driving motor drives the feeding device to move to complete feeding; the heat recovery pipeline is arranged above the grate bed. The feed inlet of the grate cooler is connected with the discharge outlet of the acidification roasting rotary kiln; the cooling air blows natural air into the grate cooler from one end of the air chamber below the grate bed; and the heat recovery channel of the grate cooler is connected with a combustion system.
The grate cooler cools the acidified and roasted materials to a temperature of 0-65 ℃, the temperature of the materials at the feeding end of the grate cooler is the highest, the temperature of the materials at the discharging end of the grate cooler is the lowest in the cooling process, and the heat exchange air for cooling the materials can flow from the feeding end to the discharging end of the grate cooler under the condition of temperature rise.
The utility model also discloses a lithium-phosphorus-aluminum-stone roasting acidification method, including following step:
s1) respectively metering the lithium-phosphorus-aluminum-stone and concentrated sulfuric acid, and sending the metered lithium-phosphorus-aluminum-stone and concentrated sulfuric acid into an acid mixer, wherein the material-acid ratio is 1: 0.45;
s2) stirring and mixing in an acid mixer to obtain an acid mixture;
s3) feeding the mixed acid material into an acidification roasting rotary kiln, providing a heat source through an external combustion system, and carrying out acidification roasting to obtain an acidification roasting material;
s4) discharging the acidified roasting materials from the kiln, cooling the acidified materials in a grate cooler by using natural air for 0-65 ℃, and fully mixing the heat-exchanged high-temperature gas and hot air generated by a combustion system to be used as a heat source of the acidified roasting rotary kiln; after cooling, the acidified materials are crushed and then enter the next working procedure.
Furthermore, in the total heat source required by the acidification roasting rotary kiln, the heat energy recycled by the grate cooler accounts for 65-75%.
Furthermore, the hot air inlet of the acidification roasting rotary kiln is 800-900 ℃.
Further, the rotating speed of the rotary kiln for acidizing roasting is 0.2-2.0 r/min, and the inclination of the kiln body is 3%; the rotating speed of the rotary kiln for the acid roasting is adjusted through frequency conversion and speed regulation, and the retention time of the materials in the rotary kiln for the acid roasting is controlled.
Further, the mass ratio of the concentrated sulfuric acid to the lithium-phosphorus-aluminum-ore powder is 0.4-0.5: 1.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
(1) the utility model provides a partial heat energy that lithium-phosphorus-aluminum-stone roasting acidification system will go out kiln high temperature material and take away retrieves reuse through the comb formula cooler, the reduction system energy consumption.
(2) The utility model provides a two sections technologies of material calcination and material acidizing are concentrated in same set of kiln system with lithium phospholite calcination acidizing system and are accomplished, have simplified process flow, and the investment is more economized, and the cost is lower.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the combustion system of the present invention;
FIG. 3 is a schematic structural view of the acid storage tank of the present invention;
the acid mixing device comprises a material bin 1, an acid storage tank 2, an acid mixing machine 3, an acid roasting rotary kiln 4, a grate cooler 5 and a combustion system 6.
Detailed Description
The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.
In the present invention, the raw material composition of the lithium aluminophosphate powder is shown in table 1:
TABLE 1
During the reaction roasting acidification process, the main chemical reactions are as follows:
Li2O+H2SO4→Li2SO4+H2O
Na2O+H2SO4→Na2SO4+H2O
K2O+H2SO4→K2SO4+H2O
CaO+H2SO4→CaSO4+H2O
Fe2O3+H2SO4→Fe2(SO4)3+H2O
MgO+H2SO4→MgSO4+H2O
Al2O3+H2SO4→Al2(SO4)3+H2O
Al2O3+P2O5→2AlPO4
the chemical components and percentage content of the raw material have larger difference with the chemical components of common spodumene, especially the content of phosphorus, aluminum and silicon has larger difference with the spodumene, the raw material is low-silicon, high-phosphorus and high-aluminum raw material, the spodumene is high-silicon and high-aluminum raw material, and the main useful products of the reaction are as follows: the lithium-phosphorus-aluminum is Li2SO4And AlPO4While the main product of spodumene acidification is Li2SO4。
As shown in fig. 1 to 3, a lithium-phosphor-aluminum roasting acidification system comprises a bin 1, an acid storage tank 2, an acid mixing machine 3, an acidification roasting rotary kiln 4, a grate cooler 5 and a combustion system 6; the storage bin 1 and the acid storage tank 2 are respectively connected with an acid mixing machine 3, the acid mixing machine 3 is connected with an acidification roasting rotary kiln 4, the acidification roasting rotary kiln 4 is connected with a grate cooler 5, a heat recovery channel of the grate cooler 5 is connected with a combustion system 6, and the combustion system 6 provides a heat source for the acidification roasting rotary kiln 4; the combustion system 6 is arranged on a heat recovery channel of the grate cooler 5, and hot air recovered by the grate cooler 5 is fully mixed with a heat source generated by the combustion system 6 and then enters the acidification roasting rotary kiln 4.
Metering equipment is arranged between the acid mixing machine 3 and the acid storage tank 2 and between the acid mixing machine 3 and is used for metering added lithium aluminophosphate powder and concentrated sulfuric acid, and a rotor scale is preferably selected as the metering equipment.
The combustion system 6 is preferably a hot blast stove.
The storage bin 1 stores the lithium-phosphorus-aluminum mineral powder, and the acid storage tank 2 stores concentrated sulfuric acid with the concentration of 95-98%. Two spiral stirring rods are arranged in the acid mixing machine 3, so that the mixing of the lithium-phosphoaluminate mineral powder and the concentrated sulfuric acid is realized, and the mixed acid material obtained by mixing is conveyed to the discharge end of the acid mixing machine 3. And a switch valve is arranged below the acid storage tank 2 and used for controlling concentrated sulfuric acid in the acid storage tank 2 to be discharged or closed.
The discharge end of the acid mixer 3 is connected with the feed end of the acid roasting rotary kiln 4 through a spiral pusher, and the mixed acid is conveyed into the acid roasting rotary kiln 4 through the spiral pusher for acid roasting. The combustion system 6 is connected with the acidification roasting rotary kiln 47 and the grate cooler 5, is externally connected with an air inlet fan, mixes the air inlet fan with heat exchange air discharged by the grate cooler 5 to form inlet air of a combustion system 617, and then heats the inlet air to a target temperature to be used as a heat source of the acidification roasting rotary kiln 4.
The acidification roasting rotary kiln 4 comprises a furnace body and a rotary supporting device for supporting the furnace body; the furnace body comprises a rotary front section, a rotary heating section and a rotary discharging section which are connected in sequence; the rotary front section is connected with an acid mixer 3; the rotary discharging section is connected with a grate cooler 5; the rotary discharging section is provided with a kiln hood; the air inlet is arranged on the kiln head cover and is communicated with the combustion system 6; the air outlet is arranged on the rotary front section, and hot air provided by the combustion system 6 flows from the air inlet to the air outlet.
The grate cooler 5 comprises a cooling fan, an air chamber, a grate bed and a driving motor; the air chamber is positioned below the grate bed, and the cooling fan blows cold air into the air chamber; a feeding device is arranged on the grate bed; the driving motor drives the feeding device to move to complete feeding; the heat recovery pipeline is arranged above the grate bed. The feed inlet of the grate cooler 5 is connected with the discharge outlet of the acidification roasting rotary kiln 4; the cooling air blows natural air into the grate cooler 5 from one end of the air chamber below the grate bed; and the heat recovery channel of the grate cooler 5 is connected with a combustion system 6.
Preferably, the tail part of the grate cooler 5 is further provided with an exhaust gas dust collector and a tail gas fan connected with the waste dust collector, so that redundant hot air in the grate cooler 5 is subjected to dust removal treatment in the waste dust collector, is purified and then is discharged into the atmosphere through the tail gas fan, and the atmosphere pollution is avoided.
Preferably, the acidification roasting rotary kiln 4 is further provided with a kiln tail smoke chamber, the kiln tail smoke chamber is connected with a cyclone dust collector through a waste pipeline, an exhaust pipe of the cyclone dust collector is connected with an acid mist treatment system, an ash bucket of the cyclone dust collector is connected with the acid mixer 3, and fine ash collected by the cyclone dust collector is conveyed to the acid mixer 3 for recycling. And the flue gas in the acidification roasting rotary kiln 4 is subjected to dust removal treatment by a cyclone dust collector, then enters an acid mist treatment system for acid mist removal, and the purified air passing through the acid mist treatment system is exhausted into the atmosphere through an exhaust fan.
Based on the above system, the utility model discloses a lithium-phosphorus-aluminum roasting acidification method specifically includes following step:
s1, respectively metering the lithium-phosphorus-aluminum-stone and concentrated sulfuric acid, and then sending the lithium-phosphorus-aluminum-stone and concentrated sulfuric acid into an acid mixer 3;
s11, storing the ground lithium phosphorus aluminum ore powder in a storage bin 1, metering the powder by a metering device below the storage bin 1, and feeding the powder into an acid mixer 3 for stirring and mixing;
s12, conveying the concentrated sulfuric acid in the concentrated sulfuric acid storage tank to the acid storage tank 2, metering the concentrated sulfuric acid by a metering device in the pipeline, and then conveying the concentrated sulfuric acid into the acid mixer 35 for stirring and mixing;
s2 stirring and mixing in the acid mixer 3 to obtain an acid mixture;
s21, fully stirring and mixing the lithium phosphorus aluminum mineral powder and the concentrated sulfuric acid in the acid mixing machine 3, fully mixing the materials in the acid mixing machine 3, and conveying the materials to the discharge end of the acid mixing machine 3;
s22, feeding the acid mixture which is uniformly mixed into a spiral pusher through an outlet at the discharge end of the acid mixer 3, and conveying the acid mixture into the acid roasting rotary kiln 4 through the spiral pusher for acid roasting;
s3, feeding the mixed acid material into an acidification roasting rotary kiln 4, providing a heat source through an external combustion system 6, and carrying out acidification roasting to obtain an acidification material; separating dust from the roasting flue gas through a cyclone dust collector, and recycling the dust to an acid mixer 3;
s31 the combustion system 6 which is separately arranged adopts natural gas as fuel, adjusts the temperature of the flue gas at the outlet of the combustion system 6 at 900 ℃ by adjusting the air supply of the combustion system 6, adding proper cold air and recycling the waste heat air from part of the cooler, and sends the flue gas into the acidification roasting rotary kiln 4 through the hot air pipe connected with the kiln head; the flow direction of hot air in the acidification roasting rotary kiln 4 is opposite to the conveying direction of materials;
s32, carrying out acid roasting on the mixed acid material in the acid roasting rotary kiln 4, drying, dehydrating, carrying out chemical reaction and sintering reaction on the mixed acid material at the high temperature of 800-900 ℃, wherein the mixed acid material stays in the acid roasting rotary kiln 4 for about 90min, and the acid roasted material enters the next working procedure through a discharge hole of a kiln hood; in the process of the acid roasting, the rotating speed of the acid roasting rotary kiln 4 is 0.8r/min during operation, the inclination of the kiln body is 3 percent, and the inclination angle is about 1.719 degrees.
S33, collecting flue gas from the combustion system 6 and waste gas generated by physicochemical reaction in the acid roasting rotary kiln 4 through a kiln tail smoke chamber, introducing the collected flue gas into an acid mist treatment system through a flue gas pipeline, and discharging the treated purified gas into the atmosphere;
s4, natural air is adopted to cool the acidified materials at 0-65 ℃, and the high-temperature gas after heat exchange is recycled to the combustion system 6 to be used as secondary air of the combustion system 6; after cooling, the acidified materials are crushed and then enter the next working procedure.
S41, enabling the acidified and roasted high-temperature material to fall into a grate cooler 5 from a kiln head cover, arranging a grating and a material distributing valve at the discharge end of the kiln head cover, separating the large material from the fine material by the grating, cooling the fine material in the grate cooler 5, and sliding the large material to the ground through the material distributing valve and a chute on the upper part of the grating for manual treatment;
s42, the fine materials of the grids are subjected to sufficient heat exchange with the entering cold air in the grate cooler 5, the cooled materials enter a subsequent crusher matched with the grate cooler 5 to crush the materials, the particle size of the crushed materials is less than 5mm, and the crushed materials fall into subsequent conveying equipment to be conveyed to the next procedure for treatment;
and (3) conveying part of the air subjected to heat exchange in the S43 from an air outlet in the middle of the grate cooler 5 to the combustion system 6 to be used as secondary air of the combustion system 6, and discharging the rest of hot air into the atmosphere after being treated by a dust collector.
Preferably, the acid mixer 3 adopts a variable frequency speed regulating device to control the rotating speed of the acid mixer 3, so as to control the stirring speed of the materials and the retention time in the acid mixer 3, and control the acid mixing process effect according to different process conditions.
The hot air provided by the combustion system 6 flows from the kiln head to the kiln tail, the acid mixture is conveyed from the kiln tail of the acidification roasting rotary kiln 4 to the kiln head, and the moving directions of the acid mixture and the kiln tail are opposite, so that the hot air can fully heat and roast the acid mixture.
The above roasting acidification system and roasting acidification method for the lithium-phosphorus-aluminum-stone are adopted to roast the lithium-phosphorus-aluminum-stone, the unit heat consumption is reduced to 400kcal/kg, and compared with the original lowest energy consumption of 800kcal/kg, the energy consumption is reduced by 50%.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (5)
1. A lithium-phosphorus-aluminum roasting acidification system comprises a bin (1), an acid storage tank (2), an acid mixing machine (3), an acidification roasting rotary kiln (4), a grate cooler (5) and a combustion system (6); feed bin (1) and storage acid tank (2) are connected respectively and are mixed sour machine (3), its characterized in that: the acid mixing machine (3) is connected with the acidification roasting rotary kiln (4), the acidification roasting rotary kiln (4) is connected with the grate cooler (5), a heat recovery channel of the grate cooler (5) is connected with the combustion system (6), and the combustion system (6) provides a heat source for the acidification roasting rotary kiln (4); the hot air recovered by the grate cooler (5) is fully mixed with the heat source generated by the combustion system (6) and then enters the acidification roasting rotary kiln (4).
2. The system for roasting and acidifying dawsonite as claimed in claim 1, wherein: the acidification roasting rotary kiln (4) comprises a furnace body and a rotary supporting device for supporting the furnace body; the furnace body comprises a rotary front section, a rotary heating section and a rotary discharging section which are connected in sequence; the rotary front section is connected with an acid mixing machine; the rotary discharging section is provided with a kiln hood cover, and the discharging end of the kiln hood cover is provided with a connecting grid and a distributing valve; the discharge end of the kiln head cover is connected with a grate cooler (5); the kiln head cover is also provided with an air inlet, and the air inlet is connected with a combustion system (6).
3. The system for roasting and acidifying dawsonite as claimed in claim 2, wherein: an inclined hanging garland chain is arranged in the rotary front section.
4. The system for roasting and acidifying lithium-phosphorus-aluminum-stone according to any one of claims 1 to 3, characterized in that: the grate type cooler (5) comprises a cooling fan, an air chamber, a grate bed and a driving motor; the air chamber is positioned below the grate bed, and the cooling fan blows cold air into the air chamber; a feeding device is arranged on the grate bed; the driving motor drives the feeding device to move to complete feeding; the heat recovery pipeline is arranged above the grate bed.
5. The system for roasting and acidifying lithium-phosphorus-aluminum-stone according to any one of claims 1 to 3, characterized in that: and a spiral pusher is arranged between the acid mixer (3) and the acidification roasting rotary kiln (4).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331280A (en) * | 2019-08-19 | 2019-10-15 | 四川卡森科技有限公司 | A kind of amblygonite roasting acidification system and its roasting acidization tool |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331280A (en) * | 2019-08-19 | 2019-10-15 | 四川卡森科技有限公司 | A kind of amblygonite roasting acidification system and its roasting acidization tool |
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