阅读说明：本技术 一种黑滑石粉状悬浮煅烧增白装置和工艺 (Black talc powder suspension calcining and whitening device and process ) 是由 包先法 时继明 王仕群 崔冬梅 于 2020-08-24 设计创作，主要内容包括：本发明公开了一种黑滑石粉状悬浮煅烧增白装置和工艺,获得白度大于90%的粉状烧黑滑石产品。首先以黑滑石为原料,选矿破碎后粉磨制得黑滑石粉；然后采用多级串联悬浮预热器预热黑滑石粉,预热后的黑滑石粉进入悬浮煅烧炉系统煅烧并燃释其中有机质；最后出悬浮煅烧炉系统的烧滑石粉进入多级串联悬浮冷却器冷却。本发明的装置由多级串联悬浮预热器、一级旋风分离器、一级悬浮煅烧炉、二级旋风分离器、二级悬浮煅烧炉、辅燃点火室、多级串联悬浮冷却器、流态化冷却器等组成,在悬浮状态下完成黑滑石粉预热、煅烧和成品烧滑石粉冷却全过程。本发明工艺先进,绿色节能；自动化程度高,可实现智能化；并可以大幅提高单线生产规模。(The invention discloses a device and a process for powdery suspension calcination whitening of black talc, and a powdery calcined black talc product with whiteness of more than 90% is obtained. Firstly, taking black talc as a raw material, and grinding after mineral separation and crushing to prepare the black talc; then, preheating the black talcum powder by adopting a multistage series suspension preheater, and feeding the preheated black talcum powder into a suspension calciner system for calcining and combusting organic matters in the suspension calciner system; and finally, the calcined talcum powder out of the suspension calcining furnace system enters a multistage series suspension cooler for cooling. The device of the invention consists of a multistage series suspension preheater, a primary cyclone separator, a primary suspension calciner, a secondary cyclone separator, a secondary suspension calciner, an auxiliary combustion ignition chamber, a multistage series suspension cooler, a fluidization cooler and the like, and completes the whole processes of preheating and calcining black talcum powder and cooling finished product calcined talcum powder in a suspension state. The invention has advanced process, green and energy-saving; the automation degree is high, and intellectualization can be realized; and can greatly improve the single-line production scale.)

1. A powdery suspension of black talc calcines whitening device which characterized in that: comprises a multistage series suspension preheater, a first stage suspension calciner, a first stage cyclone separator, a second stage suspension calciner, a second stage cyclone separator, an auxiliary combustion ignition chamber, a multistage series suspension cooler and a fluidization cooler, wherein a discharge port at the lower end of the multistage series suspension preheater is communicated with a feed port at the lower side part of the first stage suspension calciner, a burner is arranged at the lower side part of the first stage suspension calciner for feeding fuel, the upper end of the first stage suspension calciner is communicated with an inlet at the top part of the first stage cyclone separator, a gas inlet at the lower end of the first stage suspension calciner is communicated with a waste gas outlet of the second stage cyclone separator, a waste gas outlet at the upper end of the first stage cyclone separator is communicated with an air inlet at the lower end of the multistage series suspension preheater, a discharge port at the lower end of the first stage cyclone separator is communicated with a feed, the lower end of the secondary suspension calciner is communicated with an auxiliary combustion ignition chamber, the upper end outlet of the secondary suspension calciner is communicated with the inlet of a secondary cyclone separator, the side part of the lower end of the auxiliary combustion ignition chamber is provided with a burner for introducing fuel, a combustion air inlet and a hot gas inlet, the lower end of the auxiliary combustion ignition chamber is communicated with a feed inlet of a fluidized cooler, the lower end discharge port of the secondary cyclone separator is communicated with the feed inlet of the upper end of a multistage series suspension cooler, the upper end of the multistage series suspension cooler is provided with a high-temperature air outlet, the lower end of the multistage series suspension cooler is provided with a bottom finished product burned talcum powder discharge pipe and a bottom cooling air inlet pipe, the high-temperature air outlet of the multistage series suspension cooler is communicated with the combustion air inlet of the auxiliary combustion ignition chamber through a high-temperature fan and a combustion air pipeline, the cooling air inlet pipe of the multistage series suspension cooler is introduced with air through a bottom cooling air inlet pipe, one end of the fluidization cooler is provided with a blanking outlet, the fluidization cooler is also provided with an exhaust outlet, and the exhaust outlet is communicated with a hot gas inlet of the auxiliary ignition chamber.

2. The suspension calcination whitening apparatus for black talc powder according to claim 1, wherein:

and the high-temperature fan is also connected with an air release valve, and part of redundant high-temperature air is purified by the air release valve through a dust collector and then is exhausted.

3. The suspension calcination whitening apparatus for black talc powder according to claim 1, wherein: the first-stage cyclone separator is single or two parallel, and the multi-stage series suspension preheater is single-row or two-row parallel.

4. The suspension calcination whitening apparatus for black talc powder according to claim 1, wherein: the two-stage cyclone separator is single or two parallel, and the multi-stage series suspension cooler is single-row or two-row parallel.

5. The suspension calcination whitening apparatus for black talc powder according to claim 1, wherein: the fuel used by the primary suspension calciner and the secondary suspension calciner is one or more of coal, natural gas, fuel oil and petroleum coke.

6. The suspension calcination whitening apparatus for black talc powder according to claim 1, wherein: and a plurality of middle necking are arranged in the cylinders of the primary suspension calciner and the secondary suspension calciner at different heights.

7. A suspension calcination whitening process for black talc powder is characterized in that: the method specifically comprises the following steps:

firstly, taking black talc as a raw material, crushing the raw material and then grinding to obtain the black talc;

then, preheating the black talcum powder by adopting a multistage series suspension preheater, and feeding the preheated black talcum powder into a suspension calciner system for calcining and combusting organic matters in the suspension calciner system;

and finally, the calcined talcum powder out of the suspension calcining furnace system enters a multistage series suspension cooler for cooling.

8. The suspension calcination whitening process for black talc powder according to claim 7, wherein: the suspension calciner system comprises a primary suspension calciner, a primary cyclone separator, a secondary suspension calciner and a secondary cyclone separator; the black talcum powder enters from a top-level feed inlet at the upper end of the multistage series suspension preheater, the black talcum powder enters a first-level suspension calciner after being preheated by the multistage series suspension preheater, the black talcum powder is calcined in the first-level suspension calciner under the environment of combustion air by using fuel, the semi-finished product burned talcum powder and waste gas which are preliminarily obtained after calcination enter a first-level cyclone separator, the waste gas is separated from the semi-finished product burned talcum powder which is preliminarily obtained by the first-level cyclone separator, the waste gas is recycled to the multistage series suspension preheater, the black talcum powder in the multistage series suspension preheater is preheated by using the waste gas, the semi-finished product burned talcum powder separated by the first-level cyclone separator is led to a second-level suspension calciner, the semi-finished product burned talcum powder and the waste gas which are obtained after calcination are led to a second-level cyclone separator in the second-level suspension calciner by, waste gas and finished burned talcum powder are separated by a secondary cyclone separator, the waste gas is recycled and led to a primary suspension calciner, the waste gas is used for providing auxiliary heat for the black talcum powder calcined in the primary suspension calciner, the burned talcum powder separated by the secondary cyclone separator is led to a multistage series suspension cooler, a cooling air inlet pipe of the multistage series suspension cooler is filled with air through a bottom-stage cooling air inlet pipe by a first fan, the air cools the finished burned talcum powder in the multistage series suspension cooler, the cooled finished burned talcum powder is discharged through a bottom-stage burned talcum powder discharging pipe at the lower end of the multistage series suspension cooler, the air and the finished burned talcum powder form high-temperature air after heat exchange, and most of the high-temperature air is sent to the secondary suspension calciner through an auxiliary combustion ignition chamber by the high-temperature fan to serve as combustion air.

9. The suspension calcination whitening process of black talc powder according to claim 8, wherein: and the high-temperature air formed after heat exchange is recycled to the auxiliary combustion ignition chamber through the exhaust outlet, so as to provide auxiliary heat for the re-calcination of the semi-finished product calcined talcum powder in the secondary suspension calciner.

10. The suspension calcination whitening process of black talc powder according to claim 8, wherein: and part of redundant high-temperature air in the high-temperature air formed in the multistage series suspension cooler is purified and discharged after passing through a dust collector through an air discharge valve.

Technical Field

The invention relates to the technical field of black talc whitening, in particular to a device and a process for powdery suspension calcination whitening of black talc.

Background

The main mineral in the black talc is talc, the content of which is 92% or more, and the black talc contains about 5% of quartz and about 2% of organic matter, and the inclusion of organic matter is a main cause of blackening. China has abundant black talc resources, the application of the black talc is limited due to low whiteness, appropriate measures must be taken to improve the whiteness of the black talc to expand the application field of the black talc, and the calcination treatment is an effective method. The calcined talc is subjected to ultrafine grinding to obtain high-quality high-whiteness ultrafine powder, and after calcination treatment, the whiteness can be greatly improved, and the calcined talc has good insulation, heat resistance, adsorption, lubrication and other properties, and is widely applied to industries such as coatings, plastics, rubber, high-grade ceramics and the like.

At present, the production of calcining and whitening the black talc mainly comprises a vertical kiln, a tunnel kiln, a ring kiln, a rotary kiln and the like, and the production enterprises are small and scattered and the technology is relatively laggard. As the blocky black talc is calcined, the process device has low heat efficiency, high calcining heat consumption, difficult guarantee of product quality uniformity, and the phenomena of insufficient burning of the inner core and the like in different degrees. The powdery calcined black talc required by a user side is obtained by selecting, crushing and grinding calcined black talc blocks, and a green, energy-saving and environment-friendly powdery calcined black talc whitening device and process are needed.

Disclosure of Invention

The invention aims to make up the defects of the prior art and provides a device and a process for suspension calcination and whitening of black talc powder.

The invention is realized by the following technical scheme:

a black talc powder suspension calcining and whitening device comprises a multistage series suspension preheater, a primary suspension calciner, a primary cyclone separator, a secondary suspension calciner, a secondary cyclone separator, an auxiliary ignition chamber, a multistage series suspension cooler and a fluidization cooler, wherein a discharge port at the lower end of the multistage series suspension preheater is communicated with a feed port at the lower side part of the primary suspension calciner, a burner is arranged at the lower side part of the primary suspension calciner for feeding fuel, the upper end of the primary suspension calciner is communicated with an inlet at the top part of the primary cyclone separator, a gas inlet at the lower end of the primary suspension calciner is communicated with a waste gas outlet of the secondary cyclone separator, a waste gas outlet at the upper end of the primary cyclone separator is communicated with an air inlet at the lower end of the multistage series suspension preheater, a discharge port at the lower end of the primary cyclone separator is communicated with a feed port at the lower side part of the secondary suspension calciner, and a, the lower end of a secondary suspension calciner is communicated with an auxiliary combustion ignition chamber, the outlet at the upper end of the secondary suspension calciner is communicated with the inlet of a secondary cyclone separator, the side part of the lower end of the auxiliary combustion ignition chamber is provided with a combustor for introducing fuel, a combustion air inlet and a hot gas inlet, the lower end of the auxiliary combustion ignition chamber is communicated with a feed inlet of a fluidized cooler through an ash discharge pipe, the discharge outlet at the lower end of the secondary cyclone separator is communicated with the feed inlet at the upper end of a multistage series suspension cooler, the upper end of the multistage series suspension cooler is provided with a high-temperature air outlet, the lower end of the multistage series suspension cooler is provided with a bottom-stage finished product burned talcum powder discharge pipe and a bottom-stage cooling air inlet pipe, the high-temperature air outlet of the multistage series suspension cooler is communicated with the combustion air inlet of the auxiliary combustion ignition chamber through a high-temperature fan and a combustion air pipeline, and the cooling, air is introduced into the fluidized cooler through a fan, a blanking outlet is formed in one end of the fluidized cooler, an exhaust outlet is further formed in the fluidized cooler, and the exhaust outlet is communicated with a hot air inlet of the auxiliary combustion ignition chamber.

And the high-temperature fan is also connected with an air release valve, and part of redundant high-temperature air is purified by the air release valve through a dust collector and then is exhausted.

The first-stage cyclone separator is single or two parallel, and the multi-stage series suspension preheater is single-row or two-row parallel.

The two-stage cyclone separator is single or two parallel, and the multi-stage series suspension cooler is single-row or two-row parallel.

The fuel used by the primary suspension calciner and the secondary suspension calciner is one or more of coal, natural gas, fuel oil and petroleum coke.

And a plurality of middle necking are arranged in the cylinders of the primary suspension calciner and the secondary suspension calciner at different heights.

The process for implementing the black talc powdery suspension calcining and whitening device specifically comprises the following steps:

firstly, taking black talc as a raw material, crushing the raw material and then grinding to obtain the black talc;

then, preheating the black talcum powder by adopting a multistage series suspension preheater, and feeding the preheated black talcum powder into a suspension calciner system for calcining and combusting organic matters in the suspension calciner system;

and finally, the calcined talcum powder out of the suspension calcining furnace system enters a multistage series suspension cooler for cooling.

The suspension calciner system comprises a primary suspension calciner, a primary cyclone separator, a secondary suspension calciner and a secondary cyclone separator; the black talcum powder enters from a top-level feed inlet at the upper end of the multistage series suspension preheater, the black talcum powder enters a first-level suspension calciner after being preheated by the multistage series suspension preheater, the black talcum powder is calcined in the first-level suspension calciner under the environment of combustion air by using fuel, the semi-finished product burned talcum powder and waste gas which are preliminarily obtained after calcination enter a first-level cyclone separator, the waste gas is separated from the semi-finished product burned talcum powder which is preliminarily obtained by the first-level cyclone separator, the waste gas is recycled to the multistage series suspension preheater, the black talcum powder in the multistage series suspension preheater is preheated by using the waste gas, the semi-finished product burned talcum powder separated by the first-level cyclone separator is led to a second-level suspension calciner, the semi-finished product burned talcum powder and the waste gas which are obtained after calcination are led to a second-level cyclone separator in the second-level suspension calciner by, waste gas and finished burned talcum powder are separated by a secondary cyclone separator, the waste gas is recycled and led to a primary suspension calciner, the waste gas is used for providing auxiliary heat for the black talcum powder calcined in the primary suspension calciner, the burned talcum powder separated by the secondary cyclone separator is led to a multistage series suspension cooler, a cooling air inlet pipe of the multistage series suspension cooler is filled with air through a bottom-stage cooling air inlet pipe by a first fan, the air cools the finished burned talcum powder in the multistage series suspension cooler, the cooled finished burned talcum powder is discharged through a bottom-stage burned talcum powder discharging pipe at the lower end of the multistage series suspension cooler, the air and the finished burned talcum powder form high-temperature air after heat exchange, and most of the high-temperature air is sent to the secondary suspension calciner through an auxiliary combustion ignition chamber by the high-temperature fan to serve as combustion air.

When the secondary suspension calciner is abnormal, the formed blanking is discharged into the fluidization cooler through the auxiliary combustion ignition chamber, is subjected to heat exchange with air in the fluidization cooler and is discharged through the blanking outlet after being cooled, and high-temperature air formed after the heat exchange is recycled to the auxiliary combustion ignition chamber through the exhaust outlet so as to provide auxiliary heat for the re-calcination of the semi-finished product calcined talcum powder in the secondary suspension calciner.

And redundant high-temperature air in the high-temperature air part formed in the multistage series suspension cooler is purified and discharged after passing through a dust collector through a blow-off valve.

The invention adopts the suspension preheating, calcining and cooling technology to realize the calcination of the black talcum powder, the heat recovery of the waste gas of the calciner and the heat recovery of the high-temperature finished product calcined talcum powder, and completes the whole processes of the preheating and calcining of the black talcum powder and the cooling of the finished product calcined talcum powder in a suspension state.

The invention comprises a secondary suspension calciner arranged in series, black talcum powder obtained primarily after the calcination of the primary suspension calciner is collected by a primary cyclone separator and then enters the secondary suspension calciner for calcination, the black talcum powder re-calcined by the secondary suspension calciner is collected by a secondary cyclone separator and then serves as finished product calcined talcum powder, and waste gas at the outlet of the secondary cyclone separator enters the primary suspension calciner. The secondary suspension calciner is initially in a pure air environment, wherein the partial pressure of carbon dioxide is lower than that of smoke, the partial pressure of oxygen is higher than that of the smoke, fuel combustion and the re-calcination of the black talcum powder are facilitated, and the calcination release of organic matters which are not separated out is further accelerated. In the working procedure, the calcining temperature of the primary suspension furnace is 700-1050 ℃, and the calcining temperature of the secondary suspension furnace is 700-1100 ℃.

The invention adopts a multistage series suspension preheater to recover the heat of the waste gas of the primary suspension calciner, the black talcum powder is fed in the preheating way and the temperature of the waste gas is reduced, the waste gas of the primary suspension calciner outlet primary cyclone separator enters the multistage series suspension preheater to gradually heat the fed black talcum powder, and the preheated black talcum powder enters the primary suspension calciner to be calcined.

The invention adopts a multistage series suspension cooler to recover the heat of the finished product of the secondary suspension calciner, namely preheating combustion air to reduce the temperature of the finished product of the calcined talcum powder, and the finished product of the calcined talcum powder obtained by separation and collection of the secondary cyclone separator enters the multistage series suspension cooler to be gradually cooled to below 120 ℃.

The invention adopts the fluidization cooler to cool the blanking of the secondary suspension calciner in abnormal condition, and the exhaust gas of the fluidization cooler enters the lower part of the secondary suspension calciner through the auxiliary combustion ignition chamber to improve the auxiliary heat.

The first-stage cyclone separator can be single or two parallel, and the corresponding multistage series suspension preheater is single-row or two-row parallel, and is determined according to the required production energy of the black talcum powder device.

The two-stage cyclone separator can be single or two parallel, and the corresponding multi-stage series suspension cooler is single-row or two-row parallel, and is determined according to the required production energy of the black talcum powder device.

The bottom of the first-stage suspension calciner and the bottom of the second-stage suspension calciner are both provided with necking for introducing spurting air, wherein the lower part of the second-stage suspension calciner is provided with an auxiliary combustion ignition chamber for ignition, and auxiliary combustion is carried out to improve the temperature of combustion air entering the bottom of the second-stage suspension calciner into the calciner.

The series number of the multi-stage series suspension preheaters is determined according to the requirement of the exhaust gas discharge temperature of the multi-stage series suspension preheaters.

The series connection stage number of the multistage series connection suspension coolers is determined according to the temperature requirement of the finished product of the multistage series connection suspension cooler for burning the talcum powder.

The invention has the advantages that: the invention preheats, calcines and cools in suspension state, has high heat exchange efficiency and low heat consumption of the system; the powdery suspension calcination has high reaction speed and high organic matter combustion degree; the temperature distribution of the suspension calcining furnace is uniform and controllable, and the uniformity and stability of the product quality are greatly improved; the high-temperature process is carried out in a static device which does not operate, the operation is stable and reliable, and the operation rate is high; the production scale is easy to be enlarged, the investment is saved, and the comprehensive energy consumption and the cost are low; the black talc with various particle sizes can be ground into powder as a raw material, so that the utilization rate of high-quality resources is improved; the automation degree is high, and the intellectualization can be realized.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: the device comprises a multistage series suspension preheater 1, a multistage series suspension calciner 2, a first cyclone separator 3, a second suspension calciner 4, a second cyclone separator 5, a multistage series suspension cooler 6, a high-temperature fan 7, an auxiliary ignition chamber 8, an air release valve 9, a fluidized cooler 10, a combustor 11, a gooseneck 12, a fan I13 and a fan II 14. A is black talcum powder, B is blanking, and C is finished product calcined talcum powder.

Detailed Description

As shown in figure 1, the invention discloses a suspension calcination whitening process for black talc powder, which comprises the following steps:

firstly, taking black talc as a raw material, and grinding after mineral separation and crushing to obtain black talc A;

then, a multistage series suspension preheater 1 is adopted to preheat the black talcum powder, and the preheated black talcum powder enters a two-stage series suspension calcining furnace system to be calcined and burn and release organic matters in the suspension calcining furnace system;

and finally, the calcined talcum powder out of the suspension calcining furnace system enters a multistage series suspension cooler 6 for cooling.

The invention also discloses a device for realizing the process, which comprises a multistage series suspension preheater 1, a primary cyclone separator 3, a primary suspension calciner 2, a secondary cyclone separator 5, a secondary suspension calciner 4, a multistage series suspension cooler 6, a fluidization cooler 10 and the like. Wherein:

the method comprises the following steps that black talcum powder A serving as a raw material enters from a top-level air inlet pipe feeding port at the upper end of a multistage series suspension preheater 1, the lower end of the multistage series suspension preheater 1 is communicated with a black talcum powder inlet at the lower side part of a primary suspension calciner 2 through a bottom-level discharge pipe, and the black talcum powder enters the primary suspension calciner 2 through the bottom-level discharge pipe at the lower end after being preheated by the multistage series suspension preheater 1;

a combustor 11 is arranged on the side part of the lower end of the primary suspension calciner 2 for adding fuel, the upper end of the primary suspension calciner 2 is communicated with an inlet at the top of the primary cyclone separator 3 through a gooseneck 12, the lower end of the primary suspension calciner 2 is communicated with an outlet of the secondary cyclone separator 5 through a pipeline and a throat, preheated black talcum powder enters the primary suspension calciner 2 through a black talcum powder inlet, the black talcum powder is calcined in the primary suspension calciner 2 in a combustion air environment by using the fuel, and a semi-finished product calcined talcum powder and waste gas which are preliminarily obtained after calcination enter the primary cyclone separator 3 through the gooseneck 12 of the primary suspension calciner 2;

an exhaust gas outlet at the upper end of the primary cyclone separator 3 is communicated with a bottom-level air inlet pipe at the lower end of the multistage series suspension preheater 1, the lower end of the primary cyclone separator 3 is communicated with a semi-finished product calcined talc powder inlet at the lower side part of the secondary suspension calciner 4 through a discharging pipe, the exhaust gas is separated from the primarily obtained semi-finished product calcined talc powder by the primary cyclone separator 3, wherein the exhaust gas is recycled to the multistage series suspension preheater 1 through the exhaust gas outlet, the black talc powder in the multistage series suspension preheater 1 is preheated by utilizing the exhaust gas, and the semi-finished product calcined talc powder separated by the primary cyclone separator 3 is led to the secondary suspension calciner 4 through the discharging pipe;

the side part of the lower end of the secondary suspension calciner 4 is provided with a burner 11 for feeding fuel, the lower end of the secondary suspension calciner 4 is communicated with an auxiliary combustion ignition chamber 8 through a pipeline and a necking, the outlet of the upper end of the secondary suspension calciner 4 is communicated with the inlet of the secondary cyclone separator 5 (also can be communicated through a gooseneck), the side part of the lower end of the auxiliary combustion ignition chamber 8 is provided with the burner 11 for feeding fuel, the inlet of combustion air is used for feeding combustion air heated by the multistage series cooler 6, the side part of the lower end of the auxiliary combustion ignition chamber 8 is also provided with a hot gas inlet for feeding exhaust gas of the fluidized cooler 10, the outlet of the upper end of the auxiliary combustion ignition chamber 8 is communicated with the lower end of the secondary suspension calciner 4, the lower end of the auxiliary combustion ignition chamber 8 is communicated with the fluidized cooler 10 through an ash discharge pipe, the semi-finished product talc powder separated by the primary cyclone separator 3 enters the secondary suspension calciner 4 through the semi-finished product talc powder inlet, and the fuel is used for re The finished product calcined talcum powder and waste gas obtained after calcination are led to a secondary cyclone separator 5, and the blanking formed when the secondary suspension calciner 4 is abnormal enters a fluidized cooler 10 through an auxiliary combustion ignition chamber 8 and an ash discharge pipe;

a waste gas outlet at the upper end of the secondary cyclone separator 5 is communicated with a waste gas inlet at the bottom of the primary suspension calciner 2, the lower end of the secondary cyclone separator 5 is communicated with a top air inlet pipe at the upper end of the multistage series suspension cooler 6 through a discharge pipe, the waste gas and finished burned talcum powder are separated by the secondary cyclone separator 5, wherein the waste gas is recycled through the waste gas outlet and led to the primary suspension calciner 2, the waste gas is used for providing auxiliary heat for the black talcum powder calcined in the primary suspension calciner 2, and the burned talcum powder separated by the secondary cyclone separator 5 is led to the multistage series suspension cooler 6 through the discharge pipe;

the upper end of the multi-stage series suspension cooler 6 is provided with a top-stage high-temperature air outlet, the lower end of the multi-stage series suspension cooler 6 is provided with a bottom-stage finished product calcined talcum powder discharging pipe, a bottom-stage cooling air inlet pipe, wherein a high-temperature air outlet of the multistage series suspension cooler 6 is communicated with a combustion air inlet of the auxiliary combustion ignition chamber 8 through a high-temperature fan 7 and a combustion air pipeline, air is introduced into the cooling air inlet pipe of the multistage series suspension cooler 6 through a bottom-stage cooling air inlet pipe by a fan I13, the air cools the finished product calcined talcum powder in the multistage series suspension cooler 6, the cooled finished product calcined talcum powder C is discharged through a bottom-stage calcined talcum powder discharge pipe at the lower end of the multistage series suspension cooler 6, the air and the finished product calcined talcum powder form high-temperature air after heat exchange, and most of the high-temperature air is sent into the secondary suspension calciner 4 through the auxiliary combustion ignition chamber 8 by the high-temperature fan 7 to serve as combustion air; and part of redundant high-temperature air passes through the dust collector through the air release valve 9 and is purified and discharged.

Air is introduced into the fluidization cooler 10 through the second fan 14, a blanking outlet is formed in one end of the fluidization cooler 10, an exhaust outlet is further formed in the fluidization cooler 10, the exhaust outlet in the fluidization cooler 10 is communicated with a hot air inlet of the auxiliary combustion ignition chamber 8, blanking B formed when the secondary suspension calciner 4 is abnormal is discharged into the fluidization cooler 10 through the auxiliary combustion ignition chamber 8, the blanking B is discharged through the blanking outlet after being subjected to heat exchange with the air and cooled in the fluidization cooler 10, and high-temperature air formed after the heat exchange is recycled to the auxiliary combustion ignition chamber 8 through the exhaust outlet, so that auxiliary heat is provided for the re-calcination of the semi-finished burned talcum powder in the secondary suspension calciner 4.

The first-stage cyclone separator 3 is single or two parallel, and the multi-stage series suspension preheater 1 is single-row or two-row parallel.

The two-stage cyclone separator 5 is single or two parallel, and the multi-stage series suspension cooler 6 is single-row or two-row parallel.

The fuel used by the primary suspension calciner 2 and the secondary suspension calciner 4 is one or more of coal, natural gas, fuel oil and petroleum coke.

And a plurality of middle necking are arranged in the cylinders of the primary suspension calcining furnace 3 and the secondary suspension calcining furnace 4 at different heights.