CN210545658U - Separation equipment for low-mud-content limestone raw material - Google Patents

Abstract

The utility model discloses a separation device for limestone raw materials with low mud content, which at least comprises a primary air washing cylinder, wherein the air washing cylinder comprises a feed inlet 1, a vibration conveying section 2, a discharge outlet 4 and an air outlet 3 which are sequentially communicated, and the vibration conveying section 2 is provided with a high-pressure air nozzle 21; the feeding hole 1 is arranged along the longitudinal direction, the air outlet 3 is arranged along the transverse direction, and the vibrating material conveying section 2 is in transitional connection with the feeding hole 1 and the air outlet 3 and is obliquely arranged; the length-diameter ratio of the vibration conveying section 2 is 9.5-13.5. The silt content of the limestone raw material is reduced to be below 0.20 percent, the average power consumption of one hundred tons is 35kwh, and the washing cost is lower than that of water.

Description

Separation equipment for low-mud-content limestone raw material

Technical Field

The utility model belongs to inorganic non-metallic raw materials and preparation field specifically are a splitter of low mud content lime stone raw materials.

Background

The active lime used in the process of desulfurizing and dephosphorizing in the process of smelting special metals, the active lime raw material used in the process of producing calcium carbide, the lime precipitator used for extracting high-purity magnesium oxide from salt lake water and the like all need lime with higher purity and activity. For example, the lime precipitant used in extracting high-purity magnesia from salt lake water needs 2.5 tons of lime produced from limestone for every 1 ton of magnesia produced, and some impurities in the limestone are simultaneously precipitated when the magnesium hydroxide is precipitated, so that the impurity content of the limestone determines the purity of the high-purity magnesia in the salt lake. The impurity content in the limestone is less than 0.2 percent, the magnesia with the magnesia content of more than 98 percent can be produced, and when the impurity content of the limestone is more than 0.5 percent, the magnesia with the magnesia content of less than 96.8 percent can only be produced. The influence of the impurity content of limestone on the purity of the high-purity magnesium oxide extracted from the salt lake water is very obvious. The limestone raw material used for producing lime in calcium carbide plants requires that the content of silt is not more than 1.5%.

In order to produce high-purity high-quality lime, in addition to the chemical composition purity of the limestone, the mountain skins and loess brought in during the mining and crushing process are also main factors influencing the purity of the limestone. The simplest method for removing the mountain skins and the loess in the raw materials is water washing, but the water washing process is difficult to realize in western regions with serious water shortage.

Disclosure of Invention

The abundant but serious regional limestone silt of lack of water of western electric power resource is difficult to realize the characteristics of washing desilt to the multistage air wash method to electric power replaces water, detaches the loess of adhesion and the mountain skin of smuggleing secretly in the limestone raw materials, provides the splitter of low mud content limestone raw materials.

In order to achieve the above task, the present invention adopts the following technical solution, and the method includes:

a separation device for low-mud content limestone raw materials at least comprises a primary air washing barrel, wherein the air washing barrel comprises a feeding hole, a vibration conveying section, a discharging hole and an air outlet which are sequentially communicated, and a high-pressure air nozzle is arranged on the vibration conveying section;

the length-diameter ratio of the vibration conveying section is 9.5-13.5.

Optionally, the feed inlet is arranged along the longitudinal direction, the air outlet is arranged along the transverse direction, and the vibration material conveying section is in transitional connection with the feed inlet and the air outlet in an inclined manner.

optionally, the inclination angle α of the vibration conveying section is 18-22 °.

optionally, the included angle β between the high-pressure air nozzle and the axis of the vibration material conveying section is 28-32 degrees.

Optionally, the height H of feed inlet 1200 ~ 1500mm the feed inlet on still install first material level detector and second material level detector, first material level detector is installed at the oral area of feed inlet, the second material level detector is installed and is located 360 ~ 450mm apart from feed inlet oral area.

Optionally, a first vibrator is arranged on the feeding hole, and a second vibrator is arranged on the vibration conveying section.

Optionally, a cloth bag dust removal separation channel and a gravity settling separation channel are sequentially arranged along the longitudinal direction; the air outlet (3) is communicated with the cloth bag dust removal separation channel and the gravity settling separation channel.

Optionally, the gravity settling separation channel is connected with the screw feeder.

Optionally, the discharge port is connected with a slide sieve; the slide sieve is connected with the screw feeder.

Optionally, the discharge port is communicated with a multi-stage air washing cylinder.

Compared with the prior art, the utility model has the advantages of:

can solve the problem that the limestone in the western severe water-deficient mountainous area can not be washed by water to remove the silt. The method utilizes rich wind and light renewable power resources in the west to replace water with electricity, saves precious water resources, produces the limestone raw material with low silt content, and realizes the value increase of mineral resources. The air washing of the production process is simpler than water washing, the air washing process occupies a small area, the raw material processing amount is large, and the production cost is low. The two-stage air washing can produce limestone raw material with silt content lower than 0.20%. According to the requirements of users on the silt content, a multi-stage air washing process can be realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a separation apparatus for low-mud content limestone raw material according to the present invention;

the reference numerals in the figures denote: 1-a feeding hole, 11-a first material level detector, 12-a second material level detector, 13-a first vibrator, 2-a vibration conveying section, 21-a high-pressure air nozzle, 22-a second vibrator, 3-an air outlet, 4-a discharge hole, 5-a bag dust removal connector, 6-a bag dust removal channel, 7-a gravity settling separation channel, 8-a slide sieve and 9-a screw feeder;

the arrows in the figure indicate the direction of travel of the material.

Detailed Description

The utility model discloses a mountain skin and loess in the raw materials after the broken limestone was detached in wind washing + screening replacement washing reduce the silt content in the limestone raw materials, improve its purity. The utility model discloses but wide application is in western electric power abundant but the serious area of lack of water.

The utility model discloses the following current that mentions blasts: the wind direction is consistent with the flow direction (moving direction) of the materials, the downstream wind washing is favorable for separating dust from particles, the flowing of the materials can be further promoted, and the dust brought away by the wind is convenient to process at the rear end.

The utility model provides a defeated material of vibration indicates to carry the material in-process to adopt vibratory conveying, and the vibration makes collision each other between flitch, material and the material, and the silt of adhesion drops, and the frequency of vibration simultaneously and the inclination cooperation of dryer provide power for lime stone material motion, need not extra power and can realize simultaneously that the vibration drops and defeated material.

The air washing process equipment adopts a two-section type air washing barrel, and a limestone air washing production line capable of washing 5-9 cm and 2-5cm is built through the diameter and the length of the air washing barrel, the inclination angle of the air washing barrel, the height control and the tightness of the material level of a feeding hole, the selection of a blowing air nozzle, the calculation and the optimization of parameters such as a mounting angle, air pressure, air speed and flow and the like.

The method comprises the steps of adopting an air washing process, designing an independent two-section air washing cylinder, sealing a feeding end, leading out dust-containing air through downstream washing, settling large-particle silt in the dust-containing air through a settling chamber, separating small-particle silt through a bag-type dust collector, and discharging the small-particle silt through a screw machine. And (4) carrying out sieve sliding treatment on the limestone after the air washing to obtain the limestone raw material with extremely low mud content. The air washing cost is lower than the water washing cost, and the average hundred tons of electricity consumption of the air washing is lower than 35 kwh.

Specifically, the utility model discloses a preparation method of low mud content lime stone raw materials, include: s1: vibrating the material to be conveyed to enable silt on the surface of the limestone material to be treated to fall off to form a moving dust-containing mixture, and carrying out downstream air washing on the moving dust-containing mixture to generate a mixed material of wind-carried dust and sand, gravel and limestone; s2: dust in wind belt with particle size less than 0.5mm is separated by cloth bag dust removal; carrying out gravity settling separation on dust with a particle size of 0.5-1.5 mm in a wind belt; s3: removing limestone and gravel which are smaller than the requirement of the particle size from the gravel limestone mixed material to obtain a low-mud-content limestone raw material; or the mixed material of the sand gravel limestone is treated for multiple times by S1 and S2 in sequence, and then the limestone and gravel with the particle size smaller than the requirement are removed, thus obtaining the limestone raw material with low mud content.

In the embodiment of the disclosure, the wind pressure of the downstream wind washing is 67-74 kPa, and the wind flow of the downstream wind washing is 620-710 m³The flow velocity of the downstream air washing is 12.1-13.5 m/s. In the embodiment of the disclosure, before vibration material conveying, lime stone materials to be treated form material sealing, so that wind washed by downstream wind flows only along the moving direction of the dust-containing mixture; the gravel limestone mixing material forms material sealing during discharging, so that dust generated by sieve sliding separation is prevented; the natural stacking porosity of the limestone material to be treated is more than 36 percent. The limestone raw material with a certain particle size difference means that a certain accumulation gap is required to be formed in an air washing object, high-pressure air is required to keep a certain flow velocity in an air washing cylinder, and otherwise, the high-pressure air cannot take away contained silt. The experimental results prove that: the stacking porosity of the limestone raw material is required to be more than 36 percent and less than 36 percent, and as the stacking porosity is reduced, the high-pressure wind resistance is rapidly increased, and the power consumption is increased; the air flow velocity of the downstream air washing is required to be more than 12.1m/s, otherwise, the dust cannot be completely carried out.

In the embodiment of the disclosure, the inclination angle of the vibration material conveying is 18-22 degrees; the included angle between the wind direction of the downstream wind washing and the inclined plane of the vibration conveying is 28-32 degrees. The vibration material conveying has a certain inclination angle, and the rolling collision gliding of the materials can be realized by applying a slight vibration force. Air with certain pressure and certain flow rate is blown into the material conveyed by vibration, the air can only flow along the material running direction, and is discharged from the air outlet when reaching the next section, and the next separation treatment is conveniently carried out.

In the embodiment of the disclosure, the vibration frequency of the vibration material conveying is 25Hz, and the excitation force is 18-22 kN. The vibration material conveying has a certain inclination angle, and the rolling collision gliding movement among the materials can be realized by applying a slight vibration force.

With reference to fig. 1, the separation apparatus for low-mud content limestone raw material of the present invention at least comprises a primary air washing drum, the air washing drum comprises a feeding port 1, a vibration feeding section 2, a discharging port 4 and an air outlet 3 which are sequentially communicated, and a high-pressure air nozzle 21 is arranged on the vibration feeding section 2; the feeding hole 1 is arranged along the longitudinal direction, the air outlet 3 is arranged along the transverse direction, and the vibrating material conveying section 2 is in transitional connection with the feeding hole 1 and the air outlet 3 and is arranged obliquely; the length-diameter ratio of the vibration conveying section 2 is 9.5-13.5. Limestone raw materials with certain particle size difference are fed into a vibration conveying section 2 of an air washing cylinder through a feeding hole 1, high-pressure air is fed through a high-pressure air nozzle 21 for downstream air washing, and dust in an air belt with the particle size smaller than 0.5mm is separated through cloth bag dust removal; and (3) carrying out gravity settling separation on dust with a particle size of 0.5-1.5 mm, washing the sand gravel limestone mixture by using downstream air, and then screening the sand gravel limestone mixture by using a slide sieve to further remove large-particle materials. The vibration material conveying section 2 of a wind washing barrel must keep certain slenderness ratio (L/D), and the L/D is 9.5 ~ 13.5 wind washing efficiency the highest, and wind washing barrel can adopt multistage series connection simultaneously, handles the material many times, can consider size requirements such as the height and the width of equipment when establishing ties, leads to and establishes ties or the reverse series connection all can realize multistage separation processing. In addition, the length-diameter ratio also determines the energy consumption of a unit product, the selection of the power, the air pressure and the flow of a high-pressure fan, the setting of the air speed of an air outlet of the air washing barrel and the like. The research result shows that: the first-stage air washing barrel is used for air washing, the silt removal efficiency can reach 80% -87%, the second-stage air washing barrel is used for air washing, the silt removal efficiency can reach 93% -95%, and the third-stage air washing barrel is used for air washing, the silt removal efficiency can reach 94% -96%. The air washing efficiency of the air washing barrel with more than three stages is lower, the more the stages are, the purer the obtained material is, but the equipment operation cost can be increased, and therefore flexible and free combination can be carried out according to the requirements in the actual production process.

In the embodiment of the disclosure, the height H of the feed inlet 1 is 1200-1500 mm, a first material level detector 11 and a second material level detector 12 are further installed on the feed inlet 1, the first material level detector 11 is installed at the opening of the feed inlet 1, and the second material level detector 12 is installed at a position 360-450 mm away from the opening of the feed inlet 1. A test shows that the feed inlet sealing and material level control system can meet the process design requirement when the L/D is 9.5-13.5 and the height H of a feed inlet material column is 1200-1500 mm. Through the cooperation of the material level detector and the vibrator, the material level height is controlled, and the sealing requirement is met. In each section of air washing barrel, the pipeline at the feed inlet end is filled with limestone raw materials to play a role in sealing, and the material level height is controlled by a material level detector and a vibrator. The vibrator power, i.e. the vibratory feed rate, must meet the lower limit of the column control height.

in the embodiment of the disclosure, the inclination angle α of the vibration material conveying section 2 is 18-22 degrees, the included angle β between the high-pressure air nozzle 21 and the axis of the vibration material conveying section 2 is 28-32 degrees, the installation of the high-pressure air nozzle 21 must ensure that the axis of the air washing cylinder and the axis of the high-pressure air nozzle 21 keep a certain included angle to ensure that the flow direction of high-pressure air is basically consistent with the trend of the air washing material, and the interference of radial air of the air washing cylinder is reduced.

In the embodiment of the present disclosure, the first vibrator 13 is provided on the feeding port 1, and the second vibrator 22 is provided on the vibration feeding section 2. The air washing barrel is provided with a certain inclination angle, and the materials can roll, collide and slide down to the next section of feed inlet by applying a slight vibration force. Air with certain pressure and certain flow rate is blown into the air washing barrel, and the air can only flow along the material running direction and is exhausted from the air outlet when reaching the feeding port of the next section of air washing barrel. And settling and collecting large-particle dust in the gas in a settling chamber, discharging the large-particle dust by using a screw machine, and introducing the rest dust-containing waste gas into a bag-type dust remover for purification treatment. The limestone raw material after being washed by the second section of wind washing cylinder passes through a slide screen to remove sand grains and mountain skins which are separated from the limestone raw material and cannot be taken away by wind power.

In the embodiment of the disclosure, a cloth bag dust removal separation channel 6 and a gravity settling separation channel 7 are sequentially arranged along the longitudinal direction; the air outlet 3 is communicated with a cloth bag dust removal separation channel 6 and a gravity settling separation channel 7; the discharge port 4 is connected with a slide sieve 8 or the discharge port 4 is communicated with a multi-stage air washing cylinder; the slide sieve 8 and the gravity settling separation channel 7 are respectively connected with a screw feeder 9. Silt separation system, the design of settling chamber mainly, after dusty wind gets into the settling chamber, because the airflow channel area increases suddenly, the velocity of wind descends under the unchangeable prerequisite of flow, according to Stokes (Stokes) law, granule settling velocity V:

wherein eta is the viscosity of the liquid medium, rho is the specific gravity of the sample, and rho₀Is the specific gravity of the medium; g is the acceleration of gravity and r is the particle radius.

When the wind speed is higher than the settling velocity of the particles with the radius r, the particles with the radius r enter the bag-type dust collector, the particles with the radius larger than r settle to the bottom of the settling chamber, and the particles are discharged by the screw machine. The settling chamber can be calculated and designed according to the size requirement of the settled particles.

The first embodiment is as follows:

the high-quality limestone crushing raw material is adopted in the implementation process, and the chemical composition of the high-quality limestone crushing raw material is as follows: 55.7% of CaO, 0.3% of MgO, and Fe₂O₃＝0.1％，SiO₂＝0.71％，Al₂O₃＝0.23％，K₂O＝0.08％，Na₂O＝0.02％，SO₃＝0.02％，P₂O₅＝0.01，LOI＝43.46％。

Construction and operation of 5-9 cm limestone raw material two-section type air washing line:

the expected index is as follows: the silt content is less than 0.5 percent, the treatment capacity is 80t/h, and the average power consumption of one hundred tons is less than 50 kwh. Actually measuring that the natural stacking porosity of limestone raw materials of 5-9 cm is 40.7%, and the wind resistance is small.

The separation equipment of the low-mud content limestone raw material comprises the following steps:

the separation apparatus of this embodiment comprises a secondary wind wash drum; the primary wind washing cylinder and the secondary wind washing cylinder have the same structure and are connected in series along the longitudinal direction.

The air washing barrel comprises a feeding hole 1, a vibration material conveying section 2, a discharging hole 4 and an air outlet 3 which are sequentially communicated, and the vibration material conveying section 2 is provided with a high-pressure air nozzle 21; the feeding hole 1 is arranged along the longitudinal direction, the air outlet 3 is arranged along the transverse direction, and the vibrating material conveying section 2 is in transitional connection with the feeding hole 1 and the air outlet 3 and is arranged obliquely; the length-diameter ratio of the vibration material conveying section 2 is 13.1, the inner diameter D is 800mm, the length L is 10500mm, and the L/D is 13.1.

the inner diameter D of the feed port 1 is 800mm, the height H is 1500mm, a first material level detector 11 and a second material level detector 12 are installed on the feed port 1, the first material level detector 11 is installed at the opening of the feed port 1, the second material level detector 12 is installed at the position 450mm away from the opening of the feed port 1, the inclination angle α of the vibration conveying section 2 is 18 degrees, the axial included angle β between the high-pressure air nozzle 21 and the vibration conveying section 2 is 32 degrees, a first vibrator 13 is arranged on the feed port 1, a second vibrator 22 is arranged on the vibration conveying section 2, a cloth bag dust removal separation channel 6 and a gravity settling separation channel 7 are sequentially arranged along the longitudinal direction, an air outlet 3 is communicated with the cloth bag dust removal separation channel 6 and the gravity settling separation channel 7, a discharge port 4 is connected with a slide sieve 8 or the discharge port 4 is communicated with a multistage air washing barrel, and the slide sieve 8 and the gravity settling separation channel 7 are respectively connected.

Equipment operation parameters and effects: the first vibrator has a power of 0.75kw and an exciting force of 7kN (lower utilization rate). The power of the second vibrator is 1.5kw, the vibration frequency is 25Hz, and the exciting force is 18 kN.

The high-pressure air nozzle 21 is connected with a G200 high-pressure fan with the model number of 2EB 1820-7 HH47, the power of 15kw, the air pressure of 67kPa and the flow rate of 710m³The high-pressure air nozzle 21 adopts a critical flow Venturi nozzle, a flow passage with gradually enlarged aperture is arranged behind the throat part of the high-pressure air nozzle, the flow speed is high, and the pressure loss is small.

The feeding amount of the feeding port 1 is 80t/h, the feeding silt content is 2.7 percent, the discharging silt content is 0.14 percent, and the silt removal rate is 94.8 percent. And the power consumption of hundreds tons of raw materials is 34 kwh.

The average power consumption of hundred tons is 35 kwh. The cost of wind washing per ton is 0.12 yuan calculated according to the electricity price of 0.34 yuan per kwh of the local area, and is lower than the cost of water washing compared with the method that 3 tons of fresh water needs to be supplemented for washing hundreds of tons of limestone raw materials.

Example two:

the high-quality limestone crushing raw material is adopted in the implementation process, and the chemical composition of the high-quality limestone crushing raw material is as follows: 55.7% of CaO, 0.3% of MgO, and Fe₂O₃＝0.1％，SiO₂＝0.71％，Al₂O₃＝0.23％，K₂O＝0.08％，Na₂O＝0.02％，SO₃＝0.02％，P₂O₅＝0.01，LOI＝43.46％。

2-5cm limestone raw material two-section type air washing line construction and operation:

the expected index is as follows: the silt content is less than 1 percent, the treatment capacity is 70t/h, and the average power consumption of one hundred tons is less than 55 kwh. Actually measuring the natural stacking porosity of limestone raw materials of 2-5cm as 38.4% and the wind resistance of the raw materials of more than 5-9 mm.

The difference between the present embodiment and the first embodiment is:

the device has the operation parameters and effects that the length-diameter ratio of the vibration conveying section 2 is 11.9, the inner diameter D is 800mm, the length L is 9500mm, the L/D is 11.9, the inclination angle α of the vibration conveying section 2 is 22 degrees, the included angle β between the high-pressure air nozzle 21 and the axis of the vibration conveying section 2 is 28 degrees, the inner diameter D of the feed port 1 is 800mm, the height H is 1200mm, the second material level detector 12 is arranged at a position 360mm away from the opening of the feed port 1, the power of the first vibrator is 0.75kw, the exciting force is 10kN (the using rate is lower), the power of the second vibrator is 1.5kw, the vibration frequency is 25Hz, the exciting force 22 kN. high-pressure air nozzle 21 is connected with a G200 high-pressure fan, the model 2EB 0-7HH47, the power is 15kw, the air pressure is 74kPa, and the flow rate m 620³H; the feeding quantity of the feeding port 1 is 70 t/h;

the feed silt content is 3.1%, the discharge silt content is 0.20%, and the silt removal rate is 93.5%. And the power consumption of hundred tons of raw materials is 36 kwh.

The utility model discloses a preparation method of low mud content limestone raw materials and separation equipment are implemented in a certain severe water-deficient mountain area in northwest. A two-stage air washing line of limestone raw materials of 2-5cm at a speed of 70t/h and a two-stage air washing line of limestone raw materials of 5-9 cm at a speed of 80t/h are built, and the sand content after air washing achieves the expected purpose.

In view of investment and energy conservation, the first-stage air washing is adopted, so that the silt is difficult to completely remove, and the product does not reach the standard; and three-stage air washing is adopted, so that the construction investment of a production line is high, and the energy consumption of unit products is high. The sand content of the limestone raw material of 5-9 cm after being air washed by the two-section air washing cylinder is reduced to be below 0.15% from the original 2.0-2.7%, and the sand content of the limestone raw material of 2-5cm is reduced to be below 0.20% from the original 2.3-3.1%. The average power consumption of hundred tons is 35 kwh. The cost of wind washing per ton is 0.12 yuan calculated according to the electricity price of 0.34 yuan per kwh of the local area, and is lower than the cost of water washing compared with the method that 3 tons of fresh water needs to be supplemented for washing hundreds of tons of limestone raw materials.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of the various embodiments of the present disclosure can be made, and the same should be considered as the disclosure of the present disclosure as long as the combination does not depart from the spirit of the present disclosure.

Claims (10)

1. The separation equipment for the limestone raw material with low mud content is characterized by at least comprising a primary air washing barrel, wherein the air washing barrel comprises a feeding hole (1), a vibrating material conveying section (2), a discharging hole (4) and an air outlet (3) which are sequentially communicated, and the vibrating material conveying section (2) is provided with a high-pressure air nozzle (21);

the length-diameter ratio of the vibration conveying section (2) is 9.5-13.5.

2. The separation equipment for the low-mud content limestone raw material according to the claim 1, characterized in that the feed inlet (1) is arranged along the longitudinal direction, the air outlet (3) is arranged along the transverse direction, and the vibration material conveying section (2) is connected with the feed inlet (1) and the air outlet (3) in a transition way and is arranged in an inclined way.

3. the separation equipment for low-mud content limestone raw material according to claim 1 or 2, characterized in that the inclination angle α of the vibration material conveying section (2) is 18-22 °.

4. the separation equipment for the low-mud content limestone raw material according to the claim 1 or 2, characterized in that the included angle β between the high-pressure air nozzle (21) and the axis of the vibration material conveying section (2) is 28-32 degrees.

5. The separation equipment for the low-mud content limestone raw material according to claim 1 or 2, wherein the height H of the feeding hole (1) is 1200-1500 mm, a first material level detector (11) and a second material level detector (12) are further installed on the feeding hole (1), the first material level detector (11) is installed at the opening part of the feeding hole (1), and the second material level detector (12) is installed at a position 360-450 mm away from the opening part of the feeding hole (1).

6. The apparatus for separating limestone raw material with low mud content according to claim 1 or 2, characterized in that a first vibrator (13) is arranged on the feed inlet (1) and a second vibrator (22) is arranged on the vibrating feed section (2).

7. The separation equipment for low-mud content limestone raw materials according to claim 1 or 2, characterized in that a cloth bag dust removal separation channel (6) and a gravity settling separation channel (7) are sequentially arranged along the longitudinal direction; the air outlet (3) is communicated with the cloth bag dust removal separation channel (6) and the gravity settling separation channel (7).

8. The apparatus for the separation of low-sludge limestone raw material according to claim 7, characterized in that the gravity settling separation channel (7) is connected to a screw feeder (9).

9. The separation equipment for low-mud content limestone raw material according to claim 1 or 2, characterized in that the discharge port (4) is connected with a slide sieve (8); the slide sieve (8) is connected with the screw feeder (9).

10. The separation equipment for low-mud content limestone raw materials according to claim 1 or 2, characterized in that the discharge port (4) is communicated with a multi-stage air washing cylinder.

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