CN115537040A - Superfine magnesium hydroxide and preparation method and application thereof - Google Patents
Superfine magnesium hydroxide and preparation method and application thereof Download PDFInfo
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- CN115537040A CN115537040A CN202211044367.4A CN202211044367A CN115537040A CN 115537040 A CN115537040 A CN 115537040A CN 202211044367 A CN202211044367 A CN 202211044367A CN 115537040 A CN115537040 A CN 115537040A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/02—Compounds of alkaline earth metals or magnesium
- C09C1/028—Compounds containing only magnesium as metal
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
- C09C3/041—Grinding
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/64—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/19—Oil-absorption capacity, e.g. DBP values
Abstract
The invention belongs to the technical field of papermaking, and provides superfine magnesium hydroxide and a preparation method and application thereof. According to the preparation method provided by the invention, the brucite concentrate with the lamellar structure and the fiber brucite concentrate are adopted as the brucite concentrate, and after superfine grinding, the lamellar structure and the fiber structure are piled up mutually, so that larger pores exist among powder particles, and the oil absorption value of superfine magnesium hydroxide is greatly improved. The data of the examples show that the oil absorption value of the obtained superfine magnesium hydroxide is 60-80 mL/100g. When the superfine magnesium hydroxide is applied to the precoating layer of the thermal paper, the color development effect of the thermal paper can be improved; in addition, the superfine magnesium hydroxide has better heat conductivity, so that the heat of the printing head can be quickly conducted, the phenomenon that the coating is heated and melted due to local heat concentration is relieved, and the accumulation condition of the dirt on the coating of the printing head is relieved.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to superfine magnesium hydroxide and a preparation method and application thereof.
Background
Thermal paper is a specialty paper specifically used for thermal printers and thermal facsimile machines, and generally comprises a base paper base, a precoat layer, and a thermo-sensitive coloring layer. The main fillers currently used in precoats for thermal paper are calcined kaolin, talc and light calcium carbonate.
With the development of science and technology, the paper printing speed is faster and faster. When the thermal paper is printed at high speed, certain chemical substances (such as leuco dye, color developing agent and the like) in the coating on the surface of the paper are heated and melted locally at a moment, so that the printing head is possibly stained with the coating, the heat conductivity of the printing head is further influenced, and the color development sensitivity of the coating and the color development density of the recording layer are reduced. Thus, the precoat of thermal paper requires a high oil absorption value for the selected filler, typically above 50mL/100 g. The filler with high oil absorption can enhance the absorbability of the thermal paper to the molten substances, thereby reducing the accumulation of dirt on the printing head coating.
Partial heat-conducting filler is added into the thermosensitive precoat layer to avoid local heat accumulation, so that the phenomena of melting and adhesion of substances such as color developing agent and the like are avoided. Magnesium hydroxide is a white filler with good thermal conductivity, and is often applied to heat-conducting nylon and various electronic heat-dissipating devices. The current deep processing technology of the superfine magnesium hydroxide filler mainly comprises a brucite chemical precipitation method and a mineral method. The chemical precipitation method comprises the following processes: magnesium nitrate and absolute ethyl alcohol (or PEG 6000) with certain concentration are placed in a closed round-bottom flask to be uniformly stirred, and a constant temperature water bath is used for keeping a certain temperature. Under the condition of mechanical stirring, slowly dripping 10mL of concentrated ammonia water into a three-neck flask by using a dropping funnel, reacting for a period of time, performing vacuum filtration, washing for three times by using deionized water and absolute ethyl alcohol respectively, performing vacuum drying for 1 hour at 100 ℃, and grinding to obtain a sample. Although the obtained superfine magnesium hydroxide can be used as the precoating filler of the thermal paper, the process is complex, the reaction condition is harsh, and the application cost is higher. The preparation of the superfine magnesium hydroxide by the mineral method generally adopts a jet mill, a ball mill or a wet stirring mill, so that the operation of the mineral method is simple, but the oil absorption of the superfine magnesium hydroxide obtained by the mineral method is low, generally 30-50 mL/100g, and the superfine magnesium hydroxide cannot be applied to thermal paper.
Disclosure of Invention
In view of the above, the present invention aims to provide an ultrafine magnesium hydroxide, a preparation method thereof and applications thereof. The superfine magnesium hydroxide prepared by the preparation method provided by the invention has high oil absorption.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of superfine magnesium hydroxide, which comprises the following steps:
sequentially crushing, grinding and deironing the brucite concentrate to obtain brucite coarse powder;
mixing the brucite coarse powder with a grinding aid, and performing superfine grinding to obtain brucite fine powder;
grading the brucite fine powder to obtain the superfine magnesium hydroxide;
the brucite concentrate comprises lamellar brucite concentrate and fiber brucite concentrate.
Preferably, the mass ratio of the lamellar structure brucite concentrate to the fiber brucite concentrate is 1:5 to 5:1.
preferably, the grinding aid comprises a mixture of sodium lignosulfonate-hydroxypropyl acrylate-rosin glycerin ester copolymer and glycerol; the weight molecular weight of the sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer is 3500-4500; in the grinding aid, the mass ratio of the sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer to the glycerol is 1:1 to 1:5.
preferably, the addition amount of the grinding aid is 1.2-2.0% of the mass of brucite coarse powder.
Preferably, the ultra-fine grinding is carried out on ballsThe ball mill is carried out in a mill, the ball mill is a two-bin ball mill, the inner wall of the two-bin ball mill is a full ceramic lining plate, the two-bin ball mill comprises a front bin and a rear bin, and filling media of the front bin and the rear bin are alumina ceramic balls; the mass ratio of the filling medium in the front bin to the filling medium in the rear bin is 1:2; the density of the alumina ceramic ball is 3.2-4.0 g/cm 3 。
Preferably, the filling medium of the front bin is alumina ceramic balls with the grain size of 40mm, alumina ceramic balls with the grain size of 30mm and alumina ceramic balls with the grain size of 20mm, and the mass ratio of the alumina ceramic balls to the filling medium of the front bin is 1: (3-6): (0.8-1.5); the filling medium of the rear bin is alumina ceramic balls with the grain size of 15mm and alumina ceramic balls with the grain size of 8mm, and the mass ratio of the alumina ceramic balls to the filling medium of the rear bin is 1:2 in a mixed system.
Preferably, the total time of the ultrafine grinding is 40 to 60min.
Preferably, the rotating speed of the classification is 3600-4000 rpm, the classification is carried out in a classifier, and the surface of a blade of the classifier is covered with a ceramic wear-resistant layer.
The invention also provides the superfine magnesium hydroxide prepared by the preparation method in the technical scheme, wherein the oil absorption value of the superfine magnesium hydroxide is 60-80 mL/100g.
The invention also provides application of the superfine magnesium hydroxide in the technical scheme as a precoating filler in thermal paper.
The invention provides a preparation method of superfine magnesium hydroxide, which comprises the following steps: sequentially crushing, grinding and deironing the brucite concentrate to obtain brucite coarse powder; mixing the brucite coarse powder with a grinding aid, and performing superfine grinding to obtain brucite fine powder; grading the brucite fine powder to obtain the superfine magnesium hydroxide; the brucite concentrate comprises a lamellar structure brucite concentrate and a fiber brucite concentrate. According to the preparation method provided by the invention, the brucite concentrate with the lamellar structure and the fiber brucite concentrate are adopted as the brucite concentrate, and after superfine grinding, the lamellar structure and the fiber structure are piled up mutually, so that larger pores exist among powder particles, and the oil absorption value of superfine magnesium hydroxide is greatly improved. The data of the examples show that the oil absorption value of the obtained superfine magnesium hydroxide is 60-80 mL/100g. When the superfine magnesium hydroxide is applied to the precoating layer of the thermal paper, the color development effect of the thermal paper can be improved; in addition, because the superfine magnesium hydroxide has better heat conductivity, when the superfine magnesium hydroxide is applied to a thermal sensitive precoating, the heat of a printing head can be quickly conducted, the phenomenon that the coating is heated and melted due to local heat concentration is relieved, and the accumulation condition of the coating dirt of the printing head is relieved.
Furthermore, the mixture of the sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer and glycerol is selected as a grinding aid for superfine grinding, wherein the glycerol can prolong the retention time of the magnesium hydroxide material in a ball mill and improve the grinding fineness; the sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer can improve grinding efficiency, in addition, lignin has a C3-C6 hydrophobic framework, agglomeration of superfine magnesium hydroxide powder can be avoided, the sodium lignosulfonate component can also enhance the compatibility of the superfine magnesium hydroxide and paper, and the rosin glyceride component can improve the smoothness and the fluid permeability resistance of the thermal paper.
Furthermore, due to the use of the two-bin ball mill, the grading of the grinding media and the setting of the filling amount, the ultra-fining of the brucite concentrate can be realized, and the grinding efficiency is improved.
Drawings
FIG. 1 is a flow chart of a method of preparation provided by the present invention;
FIG. 2 is a scanning electron micrograph of the ultrafine magnesium hydroxide obtained in example 1.
Detailed Description
The invention provides a preparation method of superfine magnesium hydroxide, which comprises the following steps:
sequentially crushing, grinding and deironing the brucite concentrate to obtain brucite coarse powder;
mixing the brucite coarse powder with a grinding aid, and carrying out superfine grinding to obtain brucite fine powder;
grading the brucite fine powder to obtain the superfine magnesium hydroxide;
the brucite concentrate comprises a lamellar structure brucite concentrate and a fiber brucite concentrate.
In the present invention, the starting materials used in the present invention are preferably commercially available products unless otherwise specified.
The brucite concentrate is sequentially crushed, ground and deironized to obtain brucite coarse powder.
In the invention, the brucite concentrate comprises lamellar brucite concentrate and fibrous brucite concentrate; the preferred mass ratio of the brucite concentrate with the lamellar structure to the brucite concentrate with the fibers is 1:5 to 5:1. in the invention, the mass content of magnesium hydroxide in the brucite concentrate with the lamellar structure is preferably not less than 96%, and the mass content of magnesium hydroxide in the brucite concentrate with the fiber is preferably not less than 96%. In the invention, the laminar brucite concentrate is preferably a laminar brucite concentrate from Liaoning Brodian area; the fiber brucite concentrate is preferably from Shaanxi black wood forest land area fiber brucite concentrate.
In the invention, the brucite concentrate preferably further comprises respective pretreatment before crushing, and the pretreatment preferably comprises screening and washing which are sequentially carried out. In the present invention, the screening preferably comprises magnetic separation and hand selection; the magnetic separation and the manual separation are not particularly limited in the invention, and the magnetic separation operation and the manual separation operation which are well known to those skilled in the art can be adopted. In the present invention, the screening can remove miscellaneous stones. In the present invention, the ore washing preferably comprises the steps of: and (5) washing the screened brucite by using a high-pressure water gun. In the invention, the ore washing can remove silt and the like on the surface of brucite.
In the present invention, the crushing is preferably jaw crushing, which means crushing in a jaw crusher. In the present invention, the particle size of the crushed material is preferably 1 to 3mm.
In the present invention, the milling is preferably carried out in a ring mill. In the present invention, the particle size of the material obtained by the milling is preferably 100 to 200 mesh.
In the present invention, the iron removal is preferably carried out in an electromagnetic iron remover. In the invention, the iron removal can reduce the influence of iron impurities on whiteness.
In the present invention, the particle size of the brucite coarse powder is preferably 200 to 300 mesh.
After obtaining brucite coarse powder, the brucite coarse powder and a grinding aid are mixed for superfine grinding to obtain brucite fine powder.
In the present invention, the grinding aid preferably comprises a mixture of sodium lignosulfonate-hydroxypropyl acrylate-rosin glycerin ester copolymer and glycerin. In the invention, the weight molecular weight of the sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer is preferably 3500 to 4500. In the invention, the mass ratio of the sodium lignosulfonate-hydroxypropyl acrylate-rosin glycerin ester copolymer to the glycerol in the grinding aid is preferably 1:1 to 1:5. in the present invention, the amount of the grinding aid added is preferably 1.2 to 2.0% by mass, more preferably 1.4 to 1.8% by mass, and still more preferably 1.5 to 1.6% by mass of the brucite coarse powder. In the invention, the feeding speed of the grinding aid is preferably 3-4 Hz. In the present invention, the feeding speed of the brucite coarse powder is preferably 5 to 6Hz.
In the present invention, the ultrafine grinding is preferably carried out in a ball mill, and the ball mill is preferably a two bin ball mill. In the present invention, the inner wall of the two-bin ball mill is preferably an all-ceramic liner plate. In the invention, the two-bin ball mill comprises a front bin and a rear bin, the filling media of the front bin and the rear bin are preferably alumina ceramic balls, and the density of the alumina ceramic balls is preferably 3.2-4.0 g/cm 3 More preferably 3.6g/cm 3 . In the present invention, the mass ratio between the filling medium in the front bin and the filling medium in the rear bin is preferably 1:2.
in the invention, the filling medium of the front bin is preferably alumina ceramic balls with the grain diameter of 40mm, alumina ceramic balls with the grain diameter of 30mm and alumina ceramic balls with the grain diameter of 20mm, and the mass ratio of the alumina ceramic balls to the filling medium of the front bin is 1: (3-6): (0.8 to 1.5), more preferably 1:4: 1.2.
In the invention, the filling medium of the rear bin is preferably alumina ceramic balls with the grain diameter of 15mm and alumina ceramic balls with the grain diameter of 8mm, and the mass ratio of the alumina ceramic balls to the filling medium of the rear bin is 1:2 in a mixed system.
In the present invention, the total time of the ultrafine grinding is preferably 40 to 60min.
In the present invention, the average particle diameter of the fine brucite powder is preferably 1.0 to 2.0. Mu.m.
After obtaining the brucite fine powder, the method grades the brucite fine powder to obtain the superfine magnesium hydroxide.
In the present invention, the rotational speed of the classification is preferably 3600 to 4000rpm, and more preferably 3700 to 3900rpm. In the present invention, the classification is preferably performed in a classifier whose blade surface is coated with a ceramic wear-resistant layer. According to the invention, the ceramic wear-resistant layer is coated on the surface of the blade of the grader, so that the introduction of scrap iron impurities can be prevented, and the influence of the scrap iron on whiteness can be further reduced.
After said classification, the present invention preferably further comprises iron removal, preferably in an electromagnetic iron remover.
FIG. 1 is a flow chart of a preparation method provided by the present invention.
The invention also provides the superfine magnesium hydroxide obtained by the preparation method in the technical scheme. In the invention, the oil absorption value of the superfine magnesium hydroxide is 60-80 mL/100g, and the particle size is 1-2 μm.
The invention also provides application of the superfine magnesium hydroxide in the technical scheme as a precoating filler in thermal paper. When the superfine magnesium hydroxide is applied to the thermal paper, the dosage of the superfine magnesium hydroxide is not specifically limited, and the superfine magnesium hydroxide can be set by a person skilled in the art according to actual needs.
The present invention will be described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Selecting brucite concentrate with lamellar structure (magnesium hydroxide content is more than or equal to 96%) in Liaoning widen region and brucite concentrate with fiber (magnesium hydroxide content is more than or equal to 96%) in Shaanxi black woodland region, screening and washing the brucite concentrate, and mixing the brucite concentrate with the fiber and the fiber in the Shaanxi black woodland region according to a mass ratio of 5:1, crushing the mixture by a jaw crusher, grinding the crushed mixture by a ring roller mill, and removing iron to obtain 200-300-mesh brucite coarse powder.
Conveying brucite coarse powder into a two-bin ball mill through a belt to perform superfine grinding, wherein the feeding speed is 5.8Hz, adding a grinding aid accounting for 1.2 percent of the mass of the brucite coarse powder, and the grinding aid is sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer (the weight molecular weight is 3800) and glycerol in a mass ratio of 1: 1; controlling the feeding speed of the grinding aid to be 3.5Hz; grinding the brucite coarse powder in a two-bin ball mill for 45min to obtain brucite fine powder.
The whole size of the two-bin ball mill is 2.2m multiplied by 7.5m, the installed power is 380kW, and the inner wall is a full ceramic lining plate; the mass ratio of the filling medium in the front bin and the filling medium in the rear bin of the two-bin ball mill is 1:2, the filling medium has a density of 3.6g/cm 3 Alumina ceramic balls of (a); the sizes of the alumina ceramic balls filled in the front bin are three specifications of 40mm, 30mm and 20mm, and the mass ratio is 1:4:1.2; the size of the alumina ceramic ball filled in the rear bin is 15mm and 8mm, and the mass ratio is 1:2.
feeding the brucite fine powder into a classifier by an induced draft fan, wherein the rotation speed of the classifier is 3800rpm, and collecting the part with the grain diameter up to the standard by a collector, removing iron and packaging.
The average particle diameter of the finished product is 1.56 mu m and the oil absorption is 61mL/100g by a laser particle sizer.
Example 2
Selecting brucite concentrate with lamellar structure (magnesium hydroxide content is more than or equal to 96%) in Liaoning widen region and brucite concentrate with fiber (magnesium hydroxide content is more than or equal to 96%) in Shaanxi black woodland region, screening and washing the brucite concentrate, and mixing the brucite concentrate with the fiber and the fiber in the Shaanxi black woodland region according to the mass ratio of 3:1, crushing the mixture by a jaw crusher, grinding the crushed mixture by a ring roller mill, and removing iron to obtain 200-300-mesh brucite coarse powder.
Conveying the brucite coarse powder into a two-bin ball mill through a belt to perform superfine grinding, wherein the feeding speed of the brucite coarse powder is 5.5Hz; adding a grinding aid accounting for 1.2% of the mass of brucite coarse powder, wherein the grinding aid is sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer (the weight molecular weight is 3850) and the mass ratio of glycerin is 1:1 and the feeding speed of the grinding aid is 3.5Hz, so that the brucite coarse powder is ground for 50min in a two-bin ball mill to obtain brucite fine powder.
The parameters of the two-bin ball mill were the same as in example 1.
Feeding brucite fine powder into a classifier by an induced draft fan, wherein the rotation speed of the classifier is 3800rpm, and collecting the part with the particle size up to the standard by a collector, removing iron and packaging;
the average grain diameter of the finished product is 1.65 mu m and the oil absorption is 65mL/100g through the detection of a laser particle sizer.
Example 3
Selecting brucite concentrate with lamellar structure (magnesium hydroxide content is more than or equal to 96%) in Liaoning widen region and brucite concentrate with fiber (magnesium hydroxide content is more than or equal to 96%) in Shaanxi black woodland region, screening and washing the brucite concentrate, and mixing the brucite concentrate with the fiber in the Shaanxi black woodland region according to the mass ratio of 1:1, crushing the mixture by a jaw crusher, grinding the crushed mixture by a ring roller mill, and removing iron to obtain 200-300-mesh brucite coarse powder.
Conveying the coarse brucite powder into a two-bin ball mill through a belt to perform superfine grinding, wherein the feeding speed of the coarse brucite powder is 5.8Hz; adding a grinding aid accounting for 1.5% of the mass of the brucite coarse powder, wherein the grinding aid is a mixture of sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer (with the weight molecular weight of 3800) and glycerol in a mass ratio of 1:1 and the feeding speed of the grinding aid is 3.5Hz, so that the brucite coarse powder is ground in a two-bin ball mill for 50min to obtain brucite fine powder.
The parameters of the two-bin ball mill were the same as in example 1.
Feeding the brucite fine powder into a classifier by an induced draft fan, wherein the rotation speed of the classifier is 3800rpm, and collecting the part with the grain diameter up to the standard by a collector, removing iron and packaging.
The average grain diameter of the finished product is 1.69 mu m and the oil absorption is 72mL/100g through the detection of a laser particle sizer.
Example 4
Selecting brucite concentrate with lamellar structure (magnesium hydroxide content is more than or equal to 96%) in Liaoning widen region and brucite concentrate with fiber (magnesium hydroxide content is more than or equal to 96%) in Shaanxi black woodland region, screening and washing the brucite concentrate, and mixing the brucite concentrate with the fiber in the Shaanxi black woodland region according to the mass ratio of 1:2 crushing the coarse powder by a jaw crusher, grinding the coarse powder by a ring roller mill, and removing iron to obtain 200-300-mesh brucite coarse powder.
Conveying the brucite coarse powder into a two-bin ball mill through a belt to perform superfine grinding, wherein the feeding speed of the brucite coarse powder is 5.2Hz; adding a grinding aid accounting for 1.5 percent of the mass of the brucite coarse powder, wherein the grinding aid is a mixture of sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer (the weight molecular weight is 3850) and glycerol in a mass ratio of 1:1 and the feeding speed of the grinding aid is 3.5Hz, so that the brucite coarse powder is ground in a two-bin ball mill for 48min to obtain brucite fine powder.
The parameters of the two-bin ball mill were the same as in example 1.
Feeding brucite fine powder into a classifier by an induced draft fan, wherein the rotation speed of the classifier is 3800rpm, and collecting the part with the grain diameter reaching the standard by a collector, removing iron and packaging.
The average grain diameter of the finished product is 1.78 mu m and the oil absorption is 67mL/100g by a laser particle sizer.
Example 5
Selecting brucite concentrate with lamellar structure (magnesium hydroxide content is more than or equal to 96%) in Liaoning widen region and brucite concentrate with fiber (magnesium hydroxide content is more than or equal to 96%) in Shaanxi black woodland region, screening and washing the brucite concentrate, and mixing the brucite concentrate with the fiber in the Shaanxi black woodland region according to the mass ratio of 1:3, crushing the mixture by a jaw crusher, grinding the crushed mixture by a ring roller mill, and removing iron to obtain 200-300-mesh brucite coarse powder.
Conveying the brucite coarse powder into a two-bin ball mill through a belt to perform superfine grinding, wherein the feeding speed of the brucite coarse powder is 5.6Hz; adding a grinding aid accounting for 1.4% of the mass of the brucite coarse powder, wherein the grinding aid is a sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer (with the weight molecular weight of 3800) and glycerol in a mass ratio of 1:1 and the feeding speed of the grinding aid is 3.5Hz, so that the brucite coarse powder is ground for 50min in a two-bin ball mill to obtain brucite fine powder.
The parameters of the two-bin ball mill were the same as in example 1.
Feeding the brucite fine powder into a classifier by an induced draft fan, wherein the rotation speed of the classifier is 3800rpm, and collecting the part with the grain diameter up to the standard by a collector, removing iron and packaging.
The average particle diameter of the finished product is 1.56 mu m and the oil absorption is 64mL/100g by a laser particle sizer.
Comparative example 1
Selecting brucite concentrate with a lamellar structure (the content of magnesium hydroxide is more than or equal to 96%) in Liaoning widek region, screening and washing the ore, crushing the ore by a jaw crusher, feeding the crushed ore into a ring roller mill, grinding the crushed ore into powder, and removing iron to obtain 200-300 meshes of brucite coarse powder.
Conveying the brucite coarse powder into a two-bin ball mill through a belt to perform superfine grinding, wherein the feeding speed of the brucite coarse powder is 5.6Hz; adding a grinding aid accounting for 1.4% of the mass of the brucite coarse powder, wherein the grinding aid is a mixture of sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer (with the weight molecular weight of 3800) and glycerol in a mass ratio of 1: 1; the feeding speed of the grinding aid is 3.5Hz, so that the brucite coarse powder is ground in a two-bin ball mill for 50min to obtain brucite fine powder.
The parameters of the two-bin ball mill were the same as in example 1.
Feeding the brucite fine powder into a classifier by an induced draft fan, wherein the rotation speed of the classifier is 3800rpm, and collecting the part with the grain diameter up to the standard by a collector, removing iron and packaging.
The average particle diameter of the finished product is 1.51 mu m and the oil absorption is 44mL/100g by a laser particle sizer.
Comparative example 2
Selecting fiber brucite concentrate (the content of magnesium hydroxide is more than or equal to 96%) in the black wood forest region in Shaanxi, screening and washing the concentrate, crushing the concentrate by a jaw crusher, grinding the crushed concentrate by a ring roller mill, and removing iron to obtain 200-300-mesh brucite coarse powder.
Conveying the coarse brucite powder into a two-bin ball mill through a belt to perform superfine grinding, wherein the feeding speed of the coarse brucite powder is 5.6Hz; adding a grinding aid accounting for 1.4% of the mass of the brucite coarse powder, wherein the grinding aid is a mixture of sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer (with the weight molecular weight of 3800) and glycerol in a mass ratio of 1, and the feeding speed of the grinding aid is 3.5Hz, so that the brucite coarse powder is ground in a two-bin ball mill for 50min to obtain brucite fine powder.
The parameters of the two-bin ball mill were the same as in example 1.
Feeding the brucite fine powder into a classifier by an induced draft fan, wherein the rotation speed of the classifier is 3800rpm, and collecting the part with the grain diameter up to the standard by a collector, removing iron and packaging.
The average grain diameter of the finished product is 1.63 mu m and the oil absorption is 48mL/100g through the detection of a laser particle sizer.
Comparative example 3
Similar to example 1, the differences are: the filling medium of the front bin is ceramic balls with the size of 40mm, 30mm and 20mm, and the mass ratio of the ceramic balls to the filling medium is 1:5:1.5 alumina ceramic ball, the filling medium of the rear bin is 15mm in size and 8mm in mass ratio of 1:4 alumina ceramic balls.
The average particle diameter of the finished product is 1.92 mu m and the oil absorption is 56mL/100g by a laser particle sizer.
Table 1 shows the indexes of the ultra-fine magnesium hydroxide obtained in examples 1 to 5 and comparative examples 1 to 3.
TABLE 1 indexes related to ultrafine magnesium hydroxide obtained in examples 1 to 5 and comparative examples 1 to 2
FIG. 2 is a scanning electron micrograph of the ultrafine magnesium hydroxide obtained in example 1, and it can be seen from FIG. 2 that: the lamellar structure and the fiber structure of the magnesium hydroxide are piled up, so that larger pores exist among powder particles, and the oil absorption value of the superfine magnesium hydroxide can be greatly improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (10)
1. The preparation method of the superfine magnesium hydroxide is characterized by comprising the following steps:
sequentially crushing, grinding and deironing the brucite concentrate to obtain brucite coarse powder;
mixing the brucite coarse powder with a grinding aid, and carrying out superfine grinding to obtain brucite fine powder;
grading the brucite fine powder to obtain the superfine magnesium hydroxide;
the brucite concentrate comprises a lamellar structure brucite concentrate and a fiber brucite concentrate.
2. The preparation method according to claim 1, wherein the mass ratio of the lamellar structure brucite concentrate to the fibrous brucite concentrate is 1:5 to 5:1.
3. the method of claim 1, wherein the grinding aid comprises a mixture of sodium lignosulfonate-hydroxypropyl acrylate-rosin glycerin ester copolymer and glycerol; the weight molecular weight of the sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer is 3500-4500; the mass ratio of the sodium lignosulfonate-hydroxypropyl acrylate-rosin glyceride copolymer to the glycerol in the grinding aid is 1:1 to 1:5.
4. the preparation method according to claim 1 or 3, characterized in that the grinding aid is added in an amount of 1.2 to 2.0% by mass of brucite meal.
5. The preparation method according to claim 1, wherein the ultra-fine grinding is performed in a ball mill, the ball mill is a two-bin ball mill, the inner wall of the two-bin ball mill is an all-ceramic lining plate, the two-bin ball mill comprises a front bin and a rear bin, and the filling media of the front bin and the rear bin are alumina ceramic balls; the mass ratio of the filling medium in the front bin to the filling medium in the rear bin is 1:2; the density of the alumina ceramic ball is 3.2-4.0 g/cm 3 。
6. The preparation method according to claim 5, wherein the filling medium of the front bin is alumina ceramic balls with the grain size of 40mm, alumina ceramic balls with the grain size of 30mm and alumina ceramic balls with the grain size of 20mm, and the mass ratio of the alumina ceramic balls to the filling medium of the front bin is 1: (3-6): (0.8-1.5); the filling medium of the rear bin is alumina ceramic balls with the grain diameter of 15mm and alumina ceramic balls with the grain diameter of 8mm, and the mass ratio of the alumina ceramic balls to the filling medium of the rear bin is 1:2 in a mixed system.
7. The method of claim 1, 5 or 6, wherein the total time of the ultrafine grinding is 40 to 60min.
8. The method according to claim 1, wherein the rotational speed of the classification is 3600 to 4000rpm, the classification is performed in a classifier, and the surface of the blade of the classifier is coated with a ceramic wear-resistant layer.
9. The superfine magnesium hydroxide obtained by the preparation method of any one of claims 1 to 8, wherein the superfine magnesium hydroxide has an oil absorption value of 60 to 80mL/100g.
10. Use of the ultrafine magnesium hydroxide according to claim 9 as a precoat filler in thermal paper.
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