CN104609450A - Process and complete industrial installation for producing highly dispersed magnalium hydrotalcite powder bodies - Google Patents

Abstract

The invention discloses a process and a complete set of industrial equipment for producing highly dispersed hydrotalcite powder, which belong to the technical field of industrialization of inorganic functional materials. The device includes a slurry storage tank, a filter element type suction filter, a dispersant rectification system, a washing water regeneration system, and a continuous disc dryer; the hydrotalcite slurry enters the filter element type suction filter from the slurry storage tank for Suction filtration to obtain hydrotalcite filter cake, and the waste water produced can be reused after being purified through the washing water regeneration system; then directly add organic dispersant and mix with hydrotalcite filter cake, under the condition of mechanical stirring and/or compressed air bubbling The hydrotalcite is modified, and after the modification is completed, it is filtered with a vacuum pump, and the filter cake is transferred to a continuous disc dryer for drying; the organic dispersant used in the entire process is recycled and reused by the rectification system, avoiding the organic The dispersant pollutes the environment, reduces costs, simplifies the production process, obtains hydrotalcite products with good dispersibility and high specific surface area, and realizes large-scale production.

Description

A process and complete set of industrial equipment for producing highly dispersed hydrotalcite powder

Technical field:

The invention belongs to the technical field of industrialization of inorganic functional materials, and in particular relates to a process and a complete set of industrial equipment for producing highly dispersed hydrotalcite powder.

Background technique:

Layered Double Hydroxides (LDHs for short), also known as hydrotalcite, is a typical anionic layered material, and its chemical composition formula is [M ²⁺ _1-x M ³⁺ _x (OH ) ₂ ]A ^n- _x/n mH ₂ O, where M ²⁺ and M ³⁺ are divalent and trivalent metal cations respectively, A ^n- is an interlayer anion, x is the mole fraction of M ³⁺ ions, m is the amount of water of crystallization. The type and composition ratio of metal elements in the main layer of hydrotalcite, the type and quantity of interlayer objects, and the number of water molecules can be adjusted in a wide range according to the application requirements, which greatly enriches its functionality. It is widely used in ultraviolet blocking, infrared absorption, PVC heat stabilizer, new photoelectric materials, electrochemical energy storage and other fields.

The traditional methods for large-scale preparation of hydrotalcite in industry are co-precipitation method and nucleation-crystallization isolation method. After the synthesis reaction of hydrotalcite is completed, the slurry is directly washed with pure water and dried to obtain hydrotalcite powder product. Due to the high surface energy of hydrotalcite itself and the surface tension during the evaporation of pure water during the drying process, the final product has serious agglomeration, uneven particle size distribution, and a very low surface area (about 1-50m ² /g). This greatly limits the scope of application of hydrotalcite. Only when the agglomeration problem of hydrotalcite is solved, its special nano-effects will be well reflected in the application, and finally its mechanical, optical, thermal and other performances will be significantly improved.

Although some progress has been made in the preparation of highly dispersed hydrotalcite in the laboratory, there are still some problems to be solved in order to industrialize large-scale production: ① During the scale-up process, when the volume of the modified kettle used is enlarged to the size of ^m3 , Due to the amplification effect, the system in the kettle will be inhomogeneous, and the modification is not thorough enough, which will affect the product quality and lead to a significant decline in its performance; ② laboratory modification requires a large amount of organic dispersant (such as obtaining 1g of hydrotalcite needs to be modified with 1L of acetone ), and the recovery is difficult, and the preparation cost is high; ③ the laboratory puts the modified filter cake into a tray and dries it in a blast dryer, which cannot recycle the volatilized dispersant, resulting in waste of resources and VOCs pollution; ④ When washing with water in the laboratory, first use a vacuum pump to filter in a Buchner funnel, then transfer the filter cake to a flask, then modify it with an organic dispersant, and finally filter it in a Buchner funnel to obtain a filter cake. This process is cumbersome , not conducive to large-scale continuous production.

Invention content:

In order to overcome the amplification effect in the modification process of large reactors, recycle the organic dispersant after use and avoid environmental pollution, simplify the production process, obtain hydrotalcite products with good dispersion and high specific surface area, and realize large-scale production. The invention provides a process and a complete set of industrial equipment for producing highly dispersed hydrotalcite powder, as shown in Figure 1.

The complete industrial device for producing highly dispersed hydrotalcite powder according to the present invention, the device includes a slurry storage tank, a filter element type suction filter, a dispersant rectification system, a washing water regeneration system, and a continuous disc dryer; The talc slurry enters the filter element suction filter from the slurry storage tank for suction filtration to obtain a hydrotalcite filter cake, and the generated wastewater can be reused after being purified through the washing water regeneration system; then directly add organic dispersant and hydrotalcite filter cake Mixing, modifying the hydrotalcite under the conditions of mechanical stirring and/or compressed air bubbling, suction filtration after the modification, and transferring the modified filter cake to a continuous disc dryer for drying; used in the whole process The spent organic dispersant is recovered and reused through the dispersant rectification system.

The filter-type suction filter, the filter element is made of porous material, the pore diameter is from nanometer to micron, and the channels are in a cross distribution irregular state; during suction filtration, water or organic dispersant seeps out through the channels, and the hydrotalcite is retained to form a filter cake.

The continuous disc dryer is composed of large and small drying discs arranged alternately up and down, and each drying disc has rake leaves, which are controlled by the rake arm to make a rotary motion so that the rake leaves can continuously turn over the materials; on the large drying discs, the materials Move to the center and fall into the small drying tray on the next layer from the central discharge port. After receiving the material, the small drying tray moves outward to the outer edge of the large drying tray directly below, and at the same time, the material on the small drying tray also It moves outside and falls from the outer edge to the outer edge of the large drying plate directly below; the modified filter cake is added to the first layer of drying plate in the upper part of the dryer, and then flows continuously along the exponential spiral line through the surface of each layer of drying plate.

The dispersant rectification system recovers and refines the organic dispersant used in the modification process and the organic dispersant produced in the drying process, and enters the dispersant storage tank for the next batch of hydrotalcite modification; the dispersant rectification The system includes reboiler, dispersant rectification tower, heat exchanger and condenser, which can separate, reboil, rectify and condense organic dispersant, and remove the contained water and impurities.

In the washing water regeneration system, firstly, the waste water generated after suction filtration is neutralized using the principle of acid-base neutralization, and the pH value is maintained between 6.0-8.0, and then the metal ions in the water are removed by using the reverse osmosis membrane to obtain The purified water goes into the storage tank.

The above-mentioned complete set of industrial equipment is used in the industrial production process of highly dispersed hydrotalcite powder, and its specific steps are:

A. Add 50-2000L of hydrotalcite slurry with a solid content of 1-15wt% into a filter element suction filter, the filter element pore size is 0.1-300μm, set the suction filtration pressure difference to 0.01-0.5MPa, and use a vacuum pump to pump out the water. The talc filter cake is left in the filter element suction filter; the extracted water enters the washing water buffer tank, and is purified and reused through the washing water regeneration system;

B. Under the condition of 20-150℃, add 50-2000L organic dispersant to the filter-type suction filter, modify the hydrotalcite under the condition of mechanical stirring and/or compressed air bubbling, and set the stirring speed at 50-3000rpm , the compressed air bubbling rate is 0.1-1000mL/min; after modification for 1-72 hours, carry out suction filtration, set the pressure difference of suction filtration to 0.01-0.5MPa, transfer the obtained filter cake to a continuous disc dryer for drying, set The temperature of the disc dryer is 30-200°C, and the highly dispersed hydrotalcite powder is obtained after drying for 1-48 hours; the organic dispersant used in the modification process and produced in the drying process is recovered and refined through the dispersant rectification system Enter the dispersant storage tank for the next batch of hydrotalcite modification.

The chemical composition of the hydrotalcite is [M ²⁺ _1-x M ³⁺ _x (OH) ₂ ]A ^n- _x/n ·mH ₂ O; wherein M ²⁺ represents divalent metal cations Mg ²⁺ , Zn One or two of ²⁺ , Ca ²⁺ , Cu ²⁺ , Ni ²⁺ , Co ²⁺ , Fe ²⁺ , Mn ²⁺ , Cd ²⁺ , Be ²⁺ , preferably Mg ²⁺ , Zn ²⁺ , Ca ²⁺ , Ni ²⁺ or both; M ³⁺ represents trivalent metal cations Al ³⁺ , Co ³⁺ , Fe ³⁺ , Mn ³⁺ , Cr ³⁺ , V ³⁺ , Ti ³ One or two of ⁺ , In ³⁺ , Ga ³⁺ , preferably one or both of Al ³⁺ , Fe ³⁺ ; the acid anion ^{An- is} selected from one or more of the following acid anions Species: (1) Inorganic acid anions: CO ₃ ^2- , NO ₃ ^- , [B ₄ O ₅ (OH) ₄ ] ^2– , F ^- , Cl ^- , Br ^- , I ^- , ClO ₄ ^- , IO ₃ ^- , H ₂ PO ₄ ^- , HPO ₄ ^2- , PO ₄ ^3- , SO ₄ ^2- , S ₂ O ₃ ^2- , WO ₄ ^2- , C _r O ₄ ^2- ; (2) Organic acid anion: p-phenylene Diformate, p-hydroxybenzoate, succinate, adipate, dodecylsulfonate, benzoate; (3) Isopoly and heteropoly acid anions: Mo ₇ O ₂₄ ^6- , V ₁₀ O ₂₈ ^6- , PW ₁₁ CuO ₃₉ ^6- , SiW ₉ W ₃ O ₄₀ ^7- ; ^An- preferably NO ₃ ^- , CO ₃ ^2- , [B ₄ O ₅ (OH) ₄ ] ^2– , SO ₄ ^2- , PO ₄ ^3- , succinate, benzoate; n is the valency of the acid anion, n=1-7.

The particle size of the hydrotalcite is 30nm-5μm.

The organic dispersant is one or more of acetone, methanol, ethanol, n-propanol, isopropanol, tetrahydrofuran, acetonitrile, dioxane, dimethyl sulfoxide, N-N dimethylformamide, preferably One or both of acetone, methanol, ethanol, n-propanol, and isopropanol.

According to the principle of interface chemistry, the present invention aims at the chemical bond type of hydrotalcite and the physical and chemical properties of the surface, and uses organic solvents to modify the surface or interlayer of hydrotalcite, and designs a process and complete set of industries for producing highly dispersed hydrotalcite powder device. By modifying the organic dispersant, the dispersibility of hydrotalcite can be improved, and the agglomeration between particles can be suppressed, so that the specific surface area of the product can be increased by more than 10 times. After the hydrotalcite slurry is dehydrated to form a filter cake, the organic dispersant is directly added to the filter element suction filter for modification, that is, the filter element suction filter is used as both a suction filtration device and a modification device, which simplifies the production process , which is conducive to large-scale production; in addition, the use of rectification and condensation systems can also efficiently recycle the organic dispersant, avoiding environmental pollution, and significantly reducing production costs.

Description of drawings

The process flow diagram of the production of highly dispersed hydrotalcite powder of Fig. 1 the present invention design;

Fig. 2 is the XRD spectrogram of embodiment 1 gained hydrotalcite powder;

Fig. 3 is the infrared spectrogram of embodiment 1 gained hydrotalcite powder;

Fig. 4 is the laser particle size distribution figure of embodiment 1 gained hydrotalcite powder;

Fig. 5 is the TEM spectrogram of embodiment 1 gained hydrotalcite powder;

Fig. 6 is the isothermal adsorption curve and pore distribution diagram of the hydrotalcite powder obtained in Example 1.

Detailed ways

Example 1:

A complete set of industrial equipment for producing highly dispersed hydrotalcite powder: the equipment includes a slurry storage tank, a filter element suction filter, a dispersant rectification system, a washing water regeneration system, and a continuous disc dryer; The material storage tank enters the filter element suction filter for suction filtration to obtain a hydrotalcite filter cake, and the waste water generated is purified and reused through the washing water regeneration system; then directly add an organic dispersant to mix with the hydrotalcite filter cake, and mix it with mechanical stirring and/or Or modify the hydrotalcite under the condition of compressed air bubbling, suction filter after the modification, transfer the modified filter cake to a continuous disc dryer for drying; the organic dispersant used in the whole process is dispersed The solvent rectification system recycles and reuses.

The filter-type suction filter, the filter element is made of porous material, the pore diameter is from nanometer to micron, and the channels are in a cross distribution irregular state; during suction filtration, water or organic dispersant seeps out through the channels, and the hydrotalcite is Trapped to form a hydrotalcite filter cake.

The continuous disc dryer is composed of large and small drying discs arranged alternately up and down, and each drying disc has rake leaves, which are controlled by the rake arm to make a rotary motion so that the rake leaves can continuously turn over the materials; on the large drying discs, the materials Move to the center and fall into the small drying tray on the next layer from the central discharge port. After receiving the material, the small drying tray moves outward to the outer edge of the large drying tray directly below, and at the same time, the material on the small drying tray also It moves outside and falls from the outer edge to the outer edge of the large drying plate directly below; the modified filter cake is added to the first layer of drying plate in the upper part of the dryer, and then flows continuously along the exponential spiral line through the surface of each layer of drying plate.

The dispersant rectification system recovers and refines the organic dispersant used in the modification process and the organic dispersant produced in the drying process, and enters the dispersant storage tank for the next batch of hydrotalcite modification; the dispersant rectification The system includes reboiler, dispersant rectification tower, heat exchanger and condenser, which can separate, reboil, rectify and condense organic dispersant, and remove the contained water and impurities.

In the washing water regeneration system, firstly, the waste water generated after suction filtration is neutralized using the principle of acid-base neutralization, and the pH value is maintained between 6.0-8.0, and then the metal ions in the water are removed by using the reverse osmosis membrane to obtain The purified water goes into the storage tank.

Use the above-mentioned complete set of industrial equipment for the industrial production of highly dispersed hydrotalcite powder:

A. Add 100L of hydrotalcite slurry with a solid content of 6wt%, an average particle size of 145.4nm, and a chemical formula of Mg ₆ Al ₂ (OH) ₁₆ CO ₃ 4H ₂ O into a filter-type suction filter with a pore size of 0.1 μm , set the suction filtration pressure difference to 0.1MPa, pump out the water with a vacuum pump, and leave the hydrotalcite filter cake in the filter element suction filter; the pumped out water enters the washing water buffer tank, and is purified and reused through the washing water regeneration system. and to pH=7;

B. Under the condition of 25°C, add 600L acetone to the cartridge type suction filter, modify the hydrotalcite under the condition of mechanical stirring, the stirring speed is 500rpm, carry out suction filtration after modification for 48 hours, set the pressure difference of suction filtration as 0.1MPa, the obtained filter cake was transferred to a continuous disc dryer for drying, and the temperature of the disc dryer was set to 40°C. After drying for 12 hours, a highly dispersed hydrotalcite powder was obtained; The produced acetone is recovered and refined by the dispersant rectification system and enters the dispersant storage tank for the next batch of hydrotalcite modification. After treatment, more than 99% of the water can be removed, and the purity of the acetone can reach more than 98%.

The XRD-6000 X-ray powder diffractometer of Shimadzu Corporation was used to characterize the crystal structure of the product. Figure 2 is the XRD spectrum of the hydrotalcite powder obtained in Example 1. It can be seen from the figure that Mg ₆ Al ₂ -CO The characteristic diffraction peaks of ₃ -LDHs are sharp and sharp, and the baseline is low and flat, indicating that the crystal structure of the product is complete.

The infrared absorption spectrum of the samples was measured by a Vector22 infrared spectrometer from Bruker, Germany. Figure 3 is the infrared spectrum of the hydrotalcite powder obtained in Example 1. It can be seen from the figure that the stretching vibration absorption peak of the laminate OH appeared at 3486cm ^-1 , and the bending vibration absorption peak of the laminate OH appeared at 1640cm ^-1 . 1570cm ^-1 is the stretching vibration absorption peak of interlayer CO ₃ ^2- , and 655cm ^-1 is the bending vibration absorption peak of interlayer CO ₃ ^2- . The infrared spectrum further proves that the crystal structure of the product is complete.

The particle size of the samples was measured using a Mastersizer 2000 laser particle size analyzer from Malvern, UK. Figure 4 is the laser particle size distribution diagram of the hydrotalcite powder obtained in Example 1. It can be seen from the figure that the average particle size of the product is 145.4nm, and the particle size distribution is relatively uniform; no peaks with large particle sizes appear, indicating that the product is dispersed Sex is very good, no obvious reunion phenomenon.

The grain size and morphology were observed by JEM2010 transmission electron microscope (JEOL). Fig. 5 is the TEM spectrogram of the hydrotalcite powder obtained in Example 1. It can be seen from the figure that the hydrotalcite particles are monodisperse, without agglomeration, with a particle size of 50-210 nm and an average particle size of about 145 nm.

The adsorption isotherm curve and pore size distribution of the samples were tested by Autosorb-1C-VP analyzer from Quantachrome Company, USA. Fig. 6 is the adsorption isotherm curve and pore distribution diagram of the hydrotalcite powder obtained in Example 1. It can be seen from the figure that the pore size distribution of the product is between 5-20 nm. According to the adsorption isotherm, the specific surface area of the product is 148m ² /g.

Example 2:

The complete set of industrial equipment designed using embodiment 1 is used for the industrialized production of highly dispersed hydrotalcite powder:

A. Add 100L of hydrotalcite slurry with a solid content of 1wt%, an average particle size of 5μm, and a chemical formula of Mg ₆ Al ₂ (OH) ₁₆ (NO ₃ ) ₂ ·4H ₂ O, prepared by nucleation-crystallization method Cartridge-type suction filter, the pore size of the filter element is 300μm, and the suction filtration pressure difference is set to 0.1MPa. The water is pumped out with a vacuum pump, and the hydrotalcite filter cake is left in the filter-cartridge suction filter; the extracted water enters the washing water buffer tank and passes through the washing The water regeneration system is used for purification and reuse, and is set to neutralize to pH=7;

B. Under the condition of 25°C, add 600L isopropanol to the cartridge type suction filter, modify the hydrotalcite under the condition of mechanical stirring, the stirring speed is 500rpm, carry out suction filtration after modification for 24 hours, set the suction pressure The difference is 0.1MPa, and the obtained filter cake is transferred to a continuous disc dryer for drying, and the temperature of the disc dryer is set to 40°C. After drying for 12 hours, a highly dispersed hydrotalcite powder is obtained; The isopropanol produced in the process is recovered and refined by the dispersant rectification system and enters the dispersant storage tank for the next batch of hydrotalcite modification. After treatment, more than 99% of the water can be removed. The purity of isopropanol It can reach more than 98%.

Embodiment 3:

The complete set of industrial equipment designed using embodiment 1 is used for the industrialized production of highly dispersed hydrotalcite powder:

A. Add 400L of hydrotalcite slurry with a solid content of 10wt%, an average particle size of 50nm, and a chemical formula of Zn ₄ Al ₂ (OH) ₁₂ CO ₃ 4H ₂ O, prepared by nucleation-crystallization method into the filter element pump Filter, filter element pore size is 10μm, set suction filtration pressure difference to 0.1MPa, use vacuum pump to pump out water, hydrotalcite filter cake stays in the filter element suction filter; pumped water enters the washing water buffer tank, and passes through the washing water regeneration system Perform purification and reuse, set neutralization to pH=7;

B. Under the condition of 25°C, add 600L dimethyl sulfoxide to the filter element suction filter, modify the hydrotalcite under the condition of mechanical stirring, the stirring speed is 1000rpm, perform suction filtration after 48 hours of modification, and set the suction filtration The pressure difference is 0.1MPa, and the obtained filter cake is transferred to a continuous disc dryer for drying, and the temperature of the disc dryer is set at 80° C. After drying for 12 hours, a highly dispersed hydrotalcite powder is obtained; The dimethyl sulfoxide produced in the drying process is recovered and refined by the dispersant rectification system and then enters the dispersant storage tank for the next batch of hydrotalcite modification. After treatment, more than 99% of the water can be removed, and the dimethyl sulfoxide The purity of sulfone can reach more than 98%.

Example 4:

The complete set of industrial equipment designed using embodiment 1 is used for the industrialized production of highly dispersed hydrotalcite powder:

A. Add 800L of hydrotalcite slurry with a solid content of 15wt%, an average particle size of 520nm, and a chemical formula of Zn ₄ Al ₂ (OH) ₁₂ (NO ₃ ) ₂ ·4H ₂ O, prepared by nucleation-crystallization method Cartridge-type suction filter, the pore size of the filter element is 100μm, and the filter pressure difference is set to 0.1MPa. The water is pumped out with a vacuum pump, and the hydrotalcite filter cake is left in the filter-cartridge suction filter; the extracted water enters the washing water buffer tank and passes through the washing The water regeneration system is used for purification and reuse, and is set to neutralize to pH=7;

B. Under the condition of 25°C, add 1200L organic dispersant to the cartridge type suction filter, modify the hydrotalcite under the condition that the compressed air bubbling rate is 800mL/min, carry out suction filtration after 48 hours of modification, set the suction The filter pressure difference is 0.1MPa, and the obtained filter cake is transferred to a continuous disc dryer for drying, and the temperature of the disc dryer is set at 40°C. After drying for 12 hours, a highly dispersed hydrotalcite powder is obtained; And the organic dispersant produced in the drying process is recovered and refined by the dispersant rectification system and enters the dispersant storage tank for the next batch of hydrotalcite modification. After treatment, more than 99% of the water can be removed. The organic dispersant The purity can reach more than 98%. The organic dispersants used were 600L acetone and 600L methanol.

Example 5:

The complete set of industrial equipment designed using embodiment 1 is used for the industrialized production of highly dispersed hydrotalcite powder:

A. Add 1800L of hydrotalcite slurry with a solid content of 15wt%, an average particle size of 810nm, and a chemical formula of Mg ₄ Al ₂ (OH) ₁₂ CO ₃ 4H ₂ O, prepared by nucleation-crystallization method into the filter element pump Filter, the filter core aperture is 210μm, set the suction filtration pressure difference to 0.3MPa, pump out the water with a vacuum pump, and the hydrotalcite filter cake remains in the filter core suction filter; the pumped water enters the washing water buffer tank and passes through the washing water regeneration system Perform purification and reuse, set neutralization to pH=7;

B. Under the condition of 25°C, add 2000L organic dispersant to the cartridge-type suction filter, modify the hydrotalcite under the condition of mechanical stirring, the stirring speed is 1000rpm, carry out suction filtration after 24 hours of modification, set the suction pressure The difference is 0.3MPa, and the obtained filter cake is transferred to a continuous disc dryer for drying, and the temperature of the disc dryer is set to 100°C. After drying for 12 hours, a highly dispersed hydrotalcite powder is obtained; The organic dispersant produced in the process is recovered and refined by the dispersant rectification system and enters the dispersant storage tank for the next batch of hydrotalcite modification. After treatment, more than 99% of the water can be removed. The purity of the organic dispersant It can reach more than 98%. The organic dispersants used were 1000L acetone and 1000L tetrahydrofuran.

Embodiment 6:

The complete set of industrial equipment designed using embodiment 1 is used for the industrialized production of highly dispersed hydrotalcite powder:

A. Add 400L of hydrotalcite slurry with a solid content of 12wt%, an average particle size of 2μm, and a chemical formula of Mg ₄ Al ₂ (OH) ₁₂ (NO ₃ ) ₂ ·4H ₂ O, prepared by nucleation-crystallization method Cartridge-type suction filter, the pore size of the filter element is 250μm, and the suction pressure difference is set to 0.01MPa. The water is pumped out with a vacuum pump, and the hydrotalcite filter cake is left in the filter-type suction filter; the extracted water enters the washing water buffer tank and passes through the washing The water regeneration system is used for purification and reuse, and is set to neutralize to pH=7;

B. Under the condition of 100°C, add 600L organic dispersant to the cartridge-type suction filter, and modify the hydrotalcite under the condition of compressed air bubbling. The compressed air bubbling rate is 100mL/min, and the modification is carried out after 24 hours. Suction filtration, set the pressure difference of suction filtration to 0.01MPa, transfer the obtained filter cake to a continuous disc dryer for drying, set the temperature of the disc dryer to 200°C, and obtain highly dispersed hydrotalcite powder after drying for 12 hours; The organic dispersant used in the curing process and produced in the drying process is recovered and refined by the dispersant rectification system and then enters the dispersant storage tank for the next batch of hydrotalcite modification. After treatment, more than 99% of the water can be removed In addition, the purity of the organic dispersant can reach more than 98%. The used organic dispersant is 200L acetone, 200L ethanol, 200LN-N dimethylformamide.

Claims (9)

1. A complete set of industrial equipment for producing highly dispersed hydrotalcite powder, characterized in that the equipment includes a slurry storage tank, a filter cartridge type suction filter, a dispersant rectification system, a washing water regeneration system, and a continuous disc dryer ;The hydrotalcite slurry enters the filter element suction filter from the slurry storage tank for suction filtration to obtain the hydrotalcite filter cake, and the generated waste water can be reused after being purified through the washing water regeneration system; then directly add the organic dispersant and water The talc filter cake is mixed, and the hydrotalcite is modified under the condition of mechanical stirring and/or compressed air bubbling. After the modification, the filter cake is transferred to a continuous disc dryer for drying; the whole process The organic dispersant used in the process is recovered and reused through the dispersant rectification system. 2. The complete set of industrial device according to claim 1, characterized in that, in the filter element type suction filter, the filter element is made of porous material, the pore diameter is from nanometer to micron level, and the channels are in a cross distribution irregular state; During suction filtration, water or organic dispersant seeps out through the pores, and the hydrotalcite is trapped to form a filter cake. 3. The complete set of industrial device according to claim 1, characterized in that, the continuous disc dryer is arranged alternately up and down by large and small drying discs, each drying disc has rake leaves, and the rake leaves are controlled by rake arms. The rotary motion makes the rake blades turn over the materials continuously; the materials on the large drying tray move toward the center and fall from the central discharge port into the next layer of small drying trays. After receiving the materials, the small drying trays move outward to the bottom of the At the outer edge of the large drying plate, the material on the small drying plate also moves outwards and falls from the outer edge to the outer edge of the large drying plate directly below; the modified filter cake is added to the upper part of the dryer for the first layer of drying Then flow continuously along the exponential spiral line across the surface of each layer of drying pan. 4. The complete industrial device according to claim 1, characterized in that, the organic dispersant used in the modification process and produced in the drying process is rectified and recycled by the dispersant rectification system into the dispersant storage tank , for the next batch of hydrotalcite modification; the dispersant rectification system includes a reboiler, a dispersant rectification tower, a heat exchanger, a condenser, and the organic dispersant is separated, reboiled, rectified, Condensate to remove water and impurities. 5. The complete industrial device according to claim 1, characterized in that, in the washing water regeneration system, firstly, the waste water produced after suction filtration is neutralized using the principle of acid-base neutralization, and the pH value is maintained at 6.0-8.0 Between, and then use the reverse osmosis membrane to remove the metal ions in the water, and the purified water enters the water storage tank. 6. According to any one of claims 1-5, the complete set of industrial devices is used for the industrialized production process of highly dispersed hydrotalcite powder, characterized in that, its specific steps are: A. Add 50-2000L of hydrotalcite slurry with a solid content of 1-15wt% into the filter element suction filter, the filter element aperture is 0.1-300μm, set the suction filtration pressure difference to 0.01-0.5MPa, and use a vacuum pump to pump out the water. The hydrotalcite filter cake is left in the cartridge type suction filter; the pumped water enters the washing water buffer tank, is purified by the washing water regeneration system and stored in the water storage tank, which can be reused; B. Under the condition of 20-150℃, add 50-2000L organic dispersant to the filter-type suction filter, modify the hydrotalcite under the condition of mechanical stirring and/or compressed air bubbling, and set the stirring speed at 50-3000rpm , the compressed air bubbling rate is 0.1-1000mL/min; after modification for 1-72 hours, perform suction filtration, set the pressure difference of suction filtration to 0.01-0.5MPa, and transfer the obtained filter cake to a continuous disc dryer for drying. Set the temperature of the continuous disc dryer at 30-200°C, and obtain highly dispersed hydrotalcite powder after drying for 1-48 hours; recover the organic dispersant used in the modification process and produced in the drying process through the dispersant rectification system After refining, it enters the dispersant storage tank for the modification of the next batch of hydrotalcite. 7. The industrial production process according to claim 6, characterized in that, the chemical composition of the hydrotalcite is [M ²⁺ _1-x M ³⁺ _x (OH) ₂ ]A ^n- _x/n mH ₂ O; where M ²⁺ represents divalent metal cations Mg ²⁺ , Zn ²⁺ , Ca ²⁺ , Cu ²⁺ , Ni ²⁺ , Co ²⁺ , Fe ²⁺ , Mn ²⁺ , Cd ²⁺ , Be ² One or two of ⁺ , preferably one or two of Mg ²⁺ , Zn ²⁺ , Ca ²⁺ , Ni ²⁺ ; M ³⁺ represents trivalent metal cations Al ³⁺ , Co ³⁺ , Fe One or both of ³⁺ , Mn ³⁺ , Cr ³⁺ , V ³⁺ , Ti ³⁺ , In ³⁺ , Ga ³⁺ , preferably one or both of Al ³⁺ , Fe ³⁺ ; Acid anions A ^n- are selected from one or more of the following acid anions: (1) Inorganic acid anions: CO ₃ ^2- , NO ₃ ^- , [B ₄ O ₅ (OH) ₄ ] ^2– , F ^- , Cl ^- , Br ^- , I ^- , ClO ₄ ^- , IO ₃ ^- , H ₂ PO ₄ ^- , HPO ₄ ^2- , PO ₄ ^3- , SO ₄ ^2- , S ₂ O ₃ ^2- , WO ₄ ^2- , CrO ₄ ^2- ; (2) Organic acid anions: terephthalate, p-hydroxybenzoate, succinate, adipate, dodecylsulfonate, benzoate; (3) with many, Heteropolyacid anions: Mo ₇ O ₂₄ ^6- , V ₁₀ O ₂₈ ^6- , PW ₁₁ CuO ₃₉ ^6- , SiW ₉ W ₃ O ₄₀ ^7- ; ^An- preferably NO ₃ ^- , CO ₃ ^2- , [B One of ₄ O ₅ (OH) ₄ ] ^2– , SO ₄ ^2- , PO ₄ ^3- , succinate, and benzoate; n is the valency of the acid anion, n=1-7. 8. The industrial production process according to claim 6, characterized in that the particle size of the hydrotalcite slurry is 30nm-5μm. 9. industrial production process according to claim 6, is characterized in that, described organic dispersant is acetone, methyl alcohol, ethanol, n-propanol, Virahol, tetrahydrofuran, acetonitrile, dioxane, dimethyl ethylene One or more of sulfone and N-N dimethylformamide, preferably one or both of acetone, methanol, ethanol, n-propanol, and isopropanol.