Equipment for extracting gypsum whiskers from gypsum waste by ultrasonic-assisted microwave method

Abstract

The utility model relates to equipment for extracting gypsum whiskers from gypsum wastes by an ultrasonic-assisted microwave method. The equipment comprises a size mixing tank, a pipeline ultrasonic reaction system, a microwave reaction tank and a microwave crystallizing tank, a water inlet is formed above the size mixing tank, and a size stirrer A is arranged in the size mixing tank; the pipeline ultrasonic reaction system comprises a reaction tank, an ultrasonic pipeline wrapped on the outer wall of the reaction tank and a plurality of ultrasonic generating devices arranged in the ultrasonic pipeline; a gypsum slurry pump is arranged outside the reaction tank, and a variable-frequency speed-regulating stirring device and an ultrasonic sensing probe are arranged in the reaction tank; one side of the ultrasonic pipeline is connected with the size mixing tank, and the other side is connected with the microwave reaction tank; a temperature sensor is arranged on the outer wall of the microwave reaction tank, and a slurry stirrer B is mounted in the microwave reaction tank; the microwave reaction tank is connected with a microwave crystallizing tank through a slurry pipeline D, and the microwave crystallizing tank is connected with a drying machine. The production cost is low, the comprehensive energy consumption is reduced while the production efficiency is improved, and the comprehensive utilization of industrial wastes is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of environmental protection, especially to a kind of equipment for extracting gypsum whisker from gypsum waste by ultrasonic wave assisted microwave method. BACKGROUND

[0002] Ultrasonic wave is the sound wave with frequency higher than 20000Hz, which is a kind of mechanical longitudinal wave propagating in elastic medium, and has the characteristics of good directionality, large energy and strong penetration in the process of propagation, and has great application value in the fields of detection and measurement, medicine, etc., and is usually used in medical diagnosis, medical treatment, rehabilitation medicine and other medical activities.

[0003] Microwave refers to electromagnetic wave with frequency between 300MHz and 300GHz, which has the characteristics of easy to gather into beam, high directionality and straight-line propagation, and can be used to transmit high-frequency signal in unobstructed line-of-sight free space. Microwave has a wide range of applications in many fields, mainly in radar systems, communication systems, industrial and agricultural production, scientific research, medicine and biology, etc.

[0004] The application of microwave in industrial and agricultural production mainly includes measurement and heating. By using microwave, various non-electric quantities such as temperature, humidity, thickness, speed and length can be measured, and the characteristics are that the measurement equipment does not need to contact the measured object (non-contact measurement), which is especially suitable for continuous monitoring and real-time automatic control on production line; microwave heating belongs to high-power application, which can disinfect packaged food or thaw frozen food, and can heat set high molecular compounds, and can be used for drying food, wood, paper and film materials such as movie film, and household microwave ovens have also been applied, and their performance is becoming more and more perfect. However, due to the problem that the wave intensity of ultrasonic wave and microwave decreases sharply with the increase of propagation distance, their application in industry has been limited.

[0005] Gypsum whisker is a fibrous single crystal of calcium sulfate, also known as gypsum fiber, which has excellent physical and chemical properties such as high strength, high modulus, high toughness, high insulation, chemical corrosion resistance and easy compounding with polymers, and can be used as reinforcing filler, friction material, asphalt modified material, filtering material and papermaking filler, etc. Due to its excellent performance and excellent performance-price ratio, it has a wide application field and broad market prospect. In the production of gypsum whisker, natural gypsum is mainly used as raw material, which is limited by region and has high cost, so more and more researches on preparing gypsum whisker from industrial waste are carried out.

[0006] At present, the process of acidification and acid dissolution is usually used to prepare gypsum whisker, that is, industrial by-product gypsum is crushed and then added with sulfuric acid or hydrochloric acid for acidification to remove carbonate ions, and then cooled and crystallized. This process requires a large amount of acid, has high production cost and large comprehensive energy consumption. UTILITY MODEL CONTENT

[0007] The utility model wants to solve the technical problem to provide a kind of equipment of ultrasonic wave auxiliary microwave method from gypsum waste extraction gypsum whisker, which improves production efficiency and reduces comprehensive energy consumption.

[0008] To solve the above problems, the utility model discloses a kind of equipment of ultrasonic wave auxiliary microwave method from gypsum waste extraction gypsum whisker, it is characterized by: the equipment includes sizing tank, pipeline ultrasonic reaction system, microwave reaction tank and microwave crystallization tank;The upper portion of the sizing tank is equipped with water inlet, slurry agitator A is arranged in it;The pipeline ultrasonic reaction system includes reaction tank, the ultrasonic pipeline wrapped in the outer wall of the reaction tank and the ultrasonic wave generating device of several ultrasonic pipelines in the ultrasonic pipeline;The tank outside the reaction tank is equipped with gypsum slurry pump, frequency conversion speed regulating stirring device and ultrasonic wave inductive probe are arranged in the tank;One side of the ultrasonic pipeline is respectively equipped with slurry pipeline A, slurry pipeline B connected with the sizing tank, the other side is equipped with slurry pipeline C connected with the microwave reaction tank;Temperature sensor is arranged on the outer wall of the microwave reaction tank, and slurry agitator B is mounted in the inside;The microwave reaction tank is connected with the microwave crystallization tank by slurry pipeline D, and the microwave crystallization tank is connected with drying machine.

[0009] The water inlet is mounted with water inlet regulating valve and flowmeter.

[0010] Slurry conveying pump A and slurry regulating valve A are respectively arranged in the slurry pipeline A.

[0011] Slurry backflow regulating valve is mounted on the slurry pipeline B.

[0012] Slurry regulating valve B and slurry conveying pump B are respectively arranged in the slurry pipeline C.

[0013] The ultrasonic frequency of the pipeline ultrasonic reaction system is 20kHz~100MHz.

[0014] The microwave reaction tank is connected with the microwave crystallization tank through slurry conveying pump C and filter machine in sequence by slurry pipeline D, and the reaction temperature of the microwave reaction tank is 80~150 ℃.

[0015] The microwave crystallization tank is connected with the drying machine through whisker removal pump.

[0016] Compared with prior art, the utility model has the following advantages:

[0017] 1. The utility model discloses a pipeline ultrasonic reaction system which is composed of an ultrasonic pipeline, an ultrasonic wave generating device, a reaction tank, a gypsum slurry pump, a frequency conversion speed regulating stirring device and an ultrasonic wave induction probe. The ultrasonic wave generating device is installed in the ultrasonic pipeline to form a pipeline ultrasonic device, and ultrasonic waves are emitted. According to the characteristics of ultrasonic waves, the slurry in the pipeline ultrasonic reaction system resonates with the ultrasonic waves to produce cavitation effect, thereby improving the dissolution rate of the calcium sulfate slurry, reducing filter residue and further improving production efficiency.

[0018] 2. The utility model adopts a microwave reaction tank for heating, reduces the traditional heat conduction process, has fast and uniform heating speed, can improve energy conversion efficiency and reduce comprehensive energy consumption.

[0019] 3. The utility model discloses an ultrasonic wave assisted microwave method for extracting gypsum whiskers from gypsum waste. Water is used for slurry adjustment, and no acid dissolution is needed, so that no new pollution is generated to the environment.

[0020] 4. The utility model discloses a gypsum slurry pump. The frequency of the gypsum slurry pump can be controlled to make the frequency of the gypsum slurry pump an integer multiple or a fractional multiple of the ultrasonic frequency of the pipeline ultrasonic reaction system and the microwave frequency of the microwave reaction tank.

[0021] 5. The slurry in the microwave reaction tank rotates by molecules to generate heat effect through friction, improves the chemical efficiency of the slurry and makes the later crystallization more sufficient.

[0022] 6. The utility model discloses a low production cost, green environmental protection and realizes comprehensive utilization of industrial waste. DRAWINGS

[0023] The specific embodiments of the utility model will be further described in detail below with reference to the drawings.

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Figure 2 It is a sulfate ion concentration and dissolution kinetics analysis diagram in the utility model.

[0026] In the drawings: 1 - a slurry tank; 2 - a slurry agitator A; 3 - a water inlet adjusting valve; 4 - a flow meter; 5 - a material control valve; 6 - a slurry conveying pump A; 7 - a slurry adjusting valve A; 8 - a slurry backflow adjusting valve; 9 - an ultrasonic pipeline; 10 - an ultrasonic wave generating device; 11 - a reaction tank; 12 - a gypsum slurry pump; 13 - a frequency conversion speed regulating stirring device; 14 - an ultrasonic wave induction probe; 15 - a slurry adjusting valve B; 16 - a slurry conveying pump B; 17 - a microwave reaction tank; 18 - a temperature sensor; 19 - a slurry agitator B; 20 - a slurry conveying pump C; 21 - a filter; 22 - a microwave crystallization tank; 23 - a whisker removal pump; 24 - a drying machine. DETAILED DESCRIPTION

[0027] As shown in Figure 1 An ultrasonic assisted microwave method for extracting gypsum whiskers from gypsum waste, the device comprises a mixing tank 1, a pipeline ultrasonic reaction system, a microwave reaction tank 17 and a microwave crystallization tank 22.

[0028] The upper part of the mixing tank 1 is provided with a water inlet, and a slurry agitator A2 is arranged in the mixing tank 1; the pipeline ultrasonic reaction system comprises a reaction tank 11, an ultrasonic pipeline 9 wrapped outside the reaction tank 11 and a plurality of ultrasonic wave generating devices 10 arranged in the ultrasonic pipeline 9; the outer wall of the reaction tank 11 is provided with a gypsum slurry pump 12, the inner wall of the reaction tank 11 is provided with a frequency conversion speed stirring device 13 and an ultrasonic induction probe 14; one side of the ultrasonic pipeline 9 is provided with a slurry pipeline A connected with the mixing tank 1 and a slurry pipeline B, and the other side of the ultrasonic pipeline 9 is provided with a slurry pipeline C connected with the microwave reaction tank 17; a temperature sensor 18 is arranged on the outer wall of the microwave reaction tank 17, and a slurry agitator B 19 is arranged in the microwave reaction tank 17; the microwave reaction tank 17 is connected with the microwave crystallization tank 22 through a slurry pipeline D, and the microwave crystallization tank 22 is connected with a drying machine 24.

[0029] The water inlet is provided with a water inlet adjusting valve 3 and a flowmeter 4, which can realize linkage control.

[0030] The slurry pipeline A is provided with a slurry conveying pump A6 and a slurry adjusting valve A7.

[0031] The slurry pipeline B is provided with a slurry backflow adjusting valve 8 with feedback mechanism, which can coordinate the frequency in the tank and realize intelligent control.

[0032] The slurry pipeline C is provided with a slurry adjusting valve B15 and a slurry conveying pump B16.

[0033] The ultrasonic frequency of the pipeline ultrasonic reaction system is 20kHz-100MHz.

[0034] The microwave reaction tank 17 is connected with the microwave crystallization tank 22 through a slurry conveying pump C20 and a filter 21 in sequence, and the reaction temperature of the microwave reaction tank 17 is 80-150 DEG C.

[0035] The microwave crystallization tank 22 is connected with the drying machine 24 through a whisker removal pump 23.

[0036] The ultrasonic wave generating device 10 in the utility model is produced by Kunshan Hengyou Soundda Machinery Technology Co., Ltd.; and the microwave reaction tank 17 is produced by Xi'an Shengda Environmental Protection Equipment Co., Ltd.

[0037] The method for extracting gypsum whiskers by using the device comprises the following steps:

[0038] (1) opening the material control valve 5, the crushed gypsum waste is sent into the mixing tank 1;

[0039] (2) Open the inlet regulating valve 3, flow meter 4 and slurry agitator A2 to adjust the slurry, and obtain gypsum waste slurry with a viscosity of 40~200 Pa·s;

[0040] (3) Close the slurry reflux regulating valve 8 and the slurry regulating valve B15, and open the slurry regulating valve A7. The gypsum waste slurry is transported into the reaction tank 11 by the slurry transfer pump A6.

[0041] (4) Turn on the ultrasonic generator 10 to generate ultrasound;

[0042] (5) Turn on the variable frequency speed regulating stirring device 13 and adjust the frequency of the gypsum slurry pump 12 so that its frequency is 1 / n times the ultrasonic frequency and n is an integer.

[0043] (6) When the ultrasonic sensor 14 detects that the frequency of the slurry in the reaction tank 11 is 1 / n times the ultrasonic frequency and n is an integer, the slurry regulating valve A7 is closed and the slurry regulating valve B15 is opened, and the slurry is transported into the microwave reaction tank 17 by the slurry transfer pump B16; if the slurry in the reaction tank 11 cannot reach 1 / n times the ultrasonic frequency and n is an integer as detected by the ultrasonic sensor 14 at this time, the slurry return regulating valve 8 is opened, so that the gypsum slurry returns to the gypsum waste slurry tank 1; repeat the above work until the ultrasonic sensor 14 detects that the frequency of the slurry in the reaction tank 11 is all 1 / n times the ultrasonic frequency and n is an integer, at which time the slurry in the reaction tank 11 resonates with the ultrasound;

[0044] (7) The slurry that has achieved resonance is stirred in microwave reaction vessel 17 by slurry stirrer B19. Under the action of microwave thermal effect and resonance effect, calcium sulfate breaks through the solubility limit and dissolves.

[0045] (8) When the temperature of the slurry in the microwave reaction vessel 17 reaches 90°C, the dissolved slurry is transported to the filter 21 by the slurry transfer pump C20 for filtration to obtain supersaturated calcium sulfate solution.

[0046] (9) The supersaturated calcium sulfate solution is transported to microwave crystallization tank 22 for cooling and crystallization. The crystallized product is sent to dryer 24 via whisker removal pump 23 for drying, thus obtaining gypsum whisker product.

[0047] Working principle:

[0048] Based on the characteristics and mechanism of ultrasound, the slurry in the pipeline ultrasonic reaction system resonates with the ultrasound, generating a cavitation effect, thereby improving the dissolution rate of calcium sulfate slurry.

[0049] Experiments analyzing sulfate concentration and dissolution kinetics show that under conventional mechanical stirring conditions ( Figure 2 -X1), sulfate ion concentration (SO4) 2−) with an exponential growth trend, the initial dissolution rate was high (0~30 min concentration increment reached 0.07 mol / L), and then gradually slowed down, and the equilibrium concentration was approached at about 70 min (1.18 mol / L). This phenomenon conforms to the first-order kinetic model (C(t)=Ceq−(Ceq−C0)e−kt), indicating that the dissolution process is controlled by the solid-liquid interface reaction rate. After the introduction of ultrasonic assistance ( Figure 2 -X2), the dissolution kinetics improved significantly: the sulfate concentration reached equilibrium (1.18 mol / L) within 50 min, and the initial dissolution rate increased by about 40% (0~30 min concentration increment increased to 0.08 mol / L). The cavitation effect of ultrasound accelerates dissolution, i.e. the local high pressure microjet generated by the collapse of cavitation bubbles destroys the passivation layer on the surface of calcium sulfate particles, increases the effective reaction area, and the turbulent diffusion induced by cavitation reduces the boundary layer thickness, promotes ion migration from the solid phase to the liquid phase, and improves the dissolution rate.

[0050] From the conductivity effect on ion migration experiment, it can be seen that the conventional conductivity change is significantly positively correlated with the sulfate concentration ( Figure 2 -Y1), but the conductivity ( Figure 2 -Y2) growth slope is higher under ultrasonic assistance (increment ratio from 50 μS / cm·0.01 mol / L to 60 μS / cm·0.01 mol / L). This shows that ultrasound not only accelerates dissolution, but also improves ion dispersibility, i.e. cavitation destroys the aggregation of ion clusters or unsolved particles in the solution, reduces ion migration resistance, enhances ion activity coefficient, and improves reaction rate.

[0051] Comparing the two groups of data, ultrasonic + microwave assistance shortens the dissolution time by about 28.6% (from 70 min to 50 min), and the conductivity saturation value increases by 4.0% (from 5060 μS / cm to 5370 μS / cm), effectively improving the dissolution rate of calcium sulfate slurry.

Claims

1. An apparatus for extracting gypsum whiskers from gypsum waste by ultrasonic assisted microwave method, characterized by: The device comprises a mixing tank (1), a pipeline ultrasonic reaction system, a microwave reaction tank (17) and a microwave crystallization tank (22); the mixing tank (1) is provided with a water inlet on the top, and a slurry agitator A (2) is arranged in the mixing tank (1); the pipeline ultrasonic reaction system comprises a reaction tank (11), an ultrasonic pipeline (9) wrapped outside the reaction tank (11) and a plurality of ultrasonic wave generating devices (10) arranged in the ultrasonic pipeline (9); the reaction tank (11) is provided with a gypsum slurry pump (12) outside the tank, a variable frequency speed regulating stirring device (13) and an ultrasonic induction probe (14) are arranged in the tank; one side of the ultrasonic pipeline (9) is provided with a slurry pipeline A and a slurry pipeline B connected with the mixing tank (1) respectively, and the other side is provided with a slurry pipeline C connected with the microwave reaction tank (17); a temperature sensor (18) is arranged on the outer wall of the microwave reaction tank (17), and a slurry agitator B (19) is arranged in the microwave reaction tank (17); the microwave reaction tank (17) is connected with the microwave crystallization tank (22) through a slurry pipeline D, and the microwave crystallization tank (22) is connected with a drying machine (24).

2. An apparatus for extracting gypsum whiskers from gypsum waste by ultrasonic assisted microwave method as claimed in claim 1, wherein: The water inlet is provided with a water inlet regulating valve (3) and a flowmeter (4).

3. An apparatus for extracting gypsum whiskers from gypsum waste by ultrasonic assisted microwave method as claimed in claim 1 wherein: The slurry pipeline A is provided with a slurry conveying pump A (6) and a slurry regulating valve A (7) respectively.

4. An apparatus for extracting gypsum whiskers from gypsum waste by ultrasonic assisted microwave method as claimed in claim 3 wherein: The slurry pipeline B is provided with a slurry backflow regulating valve (8).

5. An apparatus for extracting gypsum whiskers from gypsum waste by ultrasonic assisted microwave method as claimed in claim 1, wherein: The slurry pipeline C is provided with a slurry regulating valve B (15) and a slurry conveying pump B (16) respectively.

6. An apparatus for extracting gypsum whiskers from gypsum waste by ultrasonic assisted microwave method as claimed in claim 5 wherein: The ultrasonic frequency of the pipeline ultrasonic reaction system is 20 kHz-100 MHz.

7. An apparatus for extracting gypsum whiskers from gypsum waste by ultrasonic assisted microwave method as claimed in claim 1, wherein: The microwave reaction tank (17) is connected with the microwave crystallization tank (22) through the slurry pipeline D in sequence through a slurry conveying pump C (20) and a filter (21), and the reaction temperature of the microwave reaction tank (17) is 80-150 ℃.

8. An apparatus for extracting gypsum whiskers from gypsum waste by ultrasonic assisted microwave method as claimed in claim 1, wherein: The microwave crystallization tank (22) is connected with the drying machine (24) through a whisker removal pump (23).

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