CN115072743A - Method and device for producing spherical salt through mechanical physical shaping - Google Patents
Method and device for producing spherical salt through mechanical physical shaping Download PDFInfo
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- CN115072743A CN115072743A CN202210866615.7A CN202210866615A CN115072743A CN 115072743 A CN115072743 A CN 115072743A CN 202210866615 A CN202210866615 A CN 202210866615A CN 115072743 A CN115072743 A CN 115072743A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/22—Preparation in the form of granules, pieces, or other shaped products
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
- A23L27/40—Table salts; Dietetic salt substitutes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
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- C—CHEMISTRY; METALLURGY
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
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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
- C01P2006/80—Compositional purity
Abstract
The invention provides a method and a device for producing spherical table salt by mechanical physical shaping, wherein the method comprises the steps of quantitatively measuring raw salt, removing iron, and sending the raw salt into a wet autogenous mill from a raw salt bin; mixing raw salt with clean brine in a wet autogenous mill, and grinding raw salt particles into spheres; the spherical salt enters a screening unit for screening, the salt with qualified granularity is screened out and sent to a salt slurry stirring tank for stirring and washing; sending the salt slurry after stirring and washing into a thickener for secondary washing and thickening, and centrifugally dewatering the salt slurry after washing and settling; conveying the salt slurry after centrifugal dehydration into a drying system for drying; and (4) conveying the dried salt into a screening and packaging unit for screening and packaging. The method can ensure that the produced spherical salt has good quality, white color and proper particle size by reasonably designing the process flow, and can meet the requirements of markets for the spherical salt with different particle sizes.
Description
Technical Field
The invention belongs to the field of salt production, and particularly relates to a method and a device for producing spherical salt through mechanical physical shaping.
Background
At present, the domestic salt production process mainly comprises a brine vacuum evaporation crystallization process and a raw material salt crushing, washing and drying salt preparation process. The brine vacuum evaporation crystallization salt preparation process mainly comprises a multi-effect evaporation process and an electrically driven MVR evaporation process, and the existing production technology is very mature and is generally adopted by domestic well and mineral salt production enterprises. The production technology of the salt preparation technology by crushing, washing and drying the raw material salt is advanced, the technology is mainly and intensively applied to the production areas of sea salt and lake salt, and dozens of families are producing at present in China. Domestic spherical salt production is mainly attached to brine vacuum evaporation crystallization salt manufacturing process enterprises, no independent production line exists, a small amount of production is performed under special conditions, but the granularity of the produced spherical salt product is small, the quality is not guaranteed, and the product is not approved by the sales market. The shape of the salt product produced by the salt preparation process of crushing, washing and drying the raw material salt is irregular particles and has sharp corners, certain influence is brought to product packaging, eating appearance and use convenience, and the added value of the product is low. Therefore, in order to meet the market demand, further research needs to be carried out on the production of the spherical table salt, so as to develop a production process of the spherical table salt, which can meet the market demand and ensure the quality of the prepared spherical table salt.
Disclosure of Invention
In view of the above, in order to solve the above problems, the present invention provides a method for producing table salt balls by mechanical physical shaping, and an apparatus for carrying out the method. Through the reasonable design of the process flow, the produced spherical salt has good quality, white color and proper particle size, can meet the requirements of markets for the spherical salt with different particle sizes, and has the advantages of simple production process, low investment, short construction period, low energy consumption and low cost.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for producing spherical table salt through mechanical physical shaping, which comprises the following steps:
s1, feeding the raw salt into a raw salt bin; the raw salt can be conveyed into a raw salt bin by a loader;
s2, quantitatively measuring the raw salt, removing iron, and feeding the raw salt into a wet autogenous mill;
s3, fully mixing raw salt with clean brine in a wet autogenous mill, enabling raw salt particles to mutually impact and rub at a certain rotation speed of a cylinder, subjecting the raw salt particles to crushing and rubbing, and treating for a certain time to enable all edges and corners of the raw salt particles to be rubbed into round corners to form a round spherical particle state;
s4, screening the spherical salt in a screening unit to screen out salt with qualified granularity (according to the actual required granularity specification, selecting a corresponding appropriate screening device, for example, particles smaller than or equal to 4mm are salt particles with qualified granularity), sending the salt particles into a salt slurry stirring tank, injecting clean brine, and carrying out primary stirring washing;
s5, conveying the salt slurry after stirring and washing into a thickener for secondary washing and thickening, and performing centrifugal dehydration on the salt slurry after washing and settling;
s6, conveying the centrifugally dehydrated wet salt into a drying system for drying; the moisture index meets the national standard requirement of edible salt, the drying heat source can use hot air generated after heat exchange of steam, electric power, natural gas, fuel oil, coal and the like, and the dried tail gas achieves the national allowable emission standard after dust removal treatment;
and S7, conveying the dried salt into a screening and packaging unit to screen salt particles with different particle sizes, and respectively packaging.
Furthermore, in the S1, the raw salt bin is provided with the grate which can remove large blocks of salt and some impurities, and the raw salt bin is internally provided with the arch breaking device to solve the problem of unsmooth blanking caused by bridging of raw salt;
further, in S3, the bittern volume ratio in the wet autogenous mill is controlled to be 1: 0.2-2, and controlling the Baume degree of the saturated brine to be 24-25 degrees. The wet autogenous mill can guarantee the product quality through adjusting the rotation speed of the wet autogenous mill according to the requirement of the kind and the granularity of the finished product.
Further, in the step S4, the volume ratio of bittern in the salt slurry stirring tank is controlled to be 1:3 to 5.
And in the step S4, the screened large-particle salt with unqualified particle size is sent back to the wet autogenous mill to repeat the step S3 until the particle size is qualified.
Further, in S5, the volume ratio of bittern in the second washing is controlled to be 1: 1 to 3.
Further, in S5, the salt slurry after being stirred and washed enters from a settling pipe in the center of the thickener, the washing clean brine enters from the middle lower part of the thickener, the salt slurry and the clean brine move in a countercurrent manner, the salt slowly settles to the lower part of the thickener, and the washed mother liquor brine rises to the top of the thickener and overflows and is discharged; the washed mother liquor brine discharged from the overflow at the top of the thickener in the S5 and the mother liquor brine generated after the salt slurry is centrifugally dewatered are both sent into a brine clarification supply system to be treated and then can be recycled as clean brine; the brine clarification supply system can provide the required clean brine to the wet autogenous mill in S3, the salt slurry stirred tank in S4, and the thickener in S5.
Further, in the step S7, the salt is sieved into three types of particle sizes, namely 0.15-0.85mm spherical refined salt, 0.85-2.8mm spherical medium particle salt and 2.8-4.0mm spherical large particle salt.
Further, in S7, iodized salt pellets of three kinds of sizes were sieved, and then packaged.
The invention provides a device for producing spherical table salt by mechanical physical shaping, which comprises a brine clarification supply system, a feeding unit, a metering and conveying unit, a grinding and washing unit, a thickening and washing unit, a dewatering and drying unit and a screening and packaging unit, wherein the feeding unit, the metering and conveying unit, the grinding and washing unit, the thickening and washing unit, the dewatering and drying unit and the screening and packaging unit are sequentially arranged;
the discharge end of the feeding unit is connected with the feed end of the metering and conveying unit;
the discharge end of the metering and conveying unit is connected with a raw salt inlet of the grinding and washing unit;
the grinding and washing unit is used for grinding the raw salt particles into a spherical shape, screening qualified particle sizes and then washing the raw salt particles, and the discharge end of the grinding and washing unit is connected with a salt slurry inlet of the thickening and washing unit;
the thickening washing unit is used for carrying out secondary washing and thickening on the salt slurry fed into the thickening washing unit, and a salt slurry outlet of the thickening washing unit is connected with an inlet end of the dewatering drying unit;
the dehydration drying unit is used for dehydrating and drying the washed and settled salt slurry, and the discharge end of the dehydration drying unit is connected with the feed end of the screening and packaging unit;
the screening and packaging unit is used for screening and packaging salt grains with different particle sizes;
the brine clarification supply system is used for providing required clean brine for the grinding and washing unit and the thickening and washing unit, and the brine clarification supply system is used for receiving and treating mother liquor brine generated by the thickening and washing unit and the dehydration and drying unit.
Further, the grinding and washing unit comprises a wet autogenous mill, a vibration screening machine and a salt slurry stirring tank; the feed port of the wet autogenous mill is connected with the discharge end of the metering conveying unit, the material outlet of the wet autogenous mill is connected with the feed end of the vibrating screen classifier, and the brine clarification supply system supplies clean brine to the wet autogenous mill; the fine material outlet end of the vibrating screen classifier is connected with the salt grain inlet end of the salt slurry stirring tank, and the coarse material outlet end of the vibrating screen classifier is connected with the feeding hole of the wet-type autogenous mill through a conveying device; the salt thick liquid outlet end of salt thick liquid stirred tank pass through the salt thick liquid pump with the salt thick liquid entry linkage of thickening washing unit, brine clarification supply system does the clean brine of salt thick liquid stirred tank supply.
The wet autogenous mill adopts the frequency conversion form to carry out the speed governing, according to the manual regulation rotational speed of product requirement. A clean brine pipeline entering the wet type autogenous mill is provided with a flow meter, and the brine flow can be automatically controlled in an interlocking manner according to the raw salt input and the production process parameter requirement; the vibrating screen classifier sieves the spherical salt slurry, particles with overlarge particle sizes are intercepted by a screen mesh and enter a conveying device (the conveying device can be a belt conveyor and a bucket elevator, the coarse materials are conveyed into the bucket elevator through the conveyor and then are conveyed back to the wet type autogenous mill through the bucket elevator) through a coarse material outlet end, the conveying device returns the coarse materials into the wet type autogenous mill for circular processing, and the particle sizes are qualified; the particles with qualified granularity fall from the screen holes and enter the salt slurry stirring tank, and the salt slurry stirring tank receives clean brine provided by the brine clarification supply system and washes the spherical salt particles for one time.
Further, the loading unit comprises a loader and a raw salt bin loaded by the loader.
Furthermore, the raw salt bin is provided with a grate capable of removing large salt and impurities, and the salt bin is internally provided with an arch breaking device, so that the phenomenon of bridging of the raw salt can be prevented.
Furthermore, the metering and conveying unit comprises a constant feeder arranged at a discharge port of the raw salt bin, a picking and metering belt conveyor connected with an outlet of the constant feeder, a feeding belt conveyor connected with an outlet of the picking and metering belt conveyor, and an iron remover arranged on the feeding belt conveyor, wherein the iron remover can adopt a permanent magnet to adsorb iron filings in the raw salt; and the discharge end of the feeding belt conveyor is connected with the feed inlet of the wet autogenous mill.
Further, the width of the picking and metering belt conveyor is 1000mm, and the picking and metering belt conveyor is provided with a weighing and metering display device and a salt combing device. The salt combing device can adopt a rake to comb and spread the salt conveyed past.
The raw salt is sent into a pick-up and metering belt conveyor by a quantitative feeder, is firstly subjected to weighing and metering and manual impurity selection and then is sent into a feeding belt conveyor, and the iron removal treatment is carried out on the raw salt on the feeding belt conveyor.
Further, the thickening washing unit is a thickener, and a central settling tube of the thickener is connected with a salt slurry outlet end of the salt slurry stirring tank; the middle lower part of the thickener is provided with a clean brine inlet, the top of the thickener is provided with a mother liquor brine outlet, and the bottom of the thickener is provided with a salt slurry outlet; the brine clarification supply system is connected with the clean brine inlet to supply clean brine to the thickener; the brine clarification supply system is connected with the mother liquor brine outlet and used for receiving the mother liquor brine discharged from the overflow at the top of the thickener.
The salt slurry in the thickener moves in a countercurrent way with the clean brine, and the clean brine washes the salt slurry for the second time; the washed mother liquor brine overflows from a mother liquor brine outlet at the top of the thickener and flows into a brine clarification supply system for treatment; the washed and thickened salt slurry is discharged from a salt slurry outlet.
Further, the dehydration drying unit includes centrifuge, drying system, mother liquor groove, centrifuge's feed end with thickener's salt thick liquid exit linkage, centrifuge's discharge end pass through band conveyer with drying system's feed end is connected, the mother liquor brine that centrifuge throwed away collects in the mother liquor groove, the exit end in mother liquor groove pass through the brine pump with brine clarification supply system connects.
The centrifuge adopts a horizontal two-stage piston pushing continuous operation filter centrifuge. It completes all the operation steps such as feeding, separating, washing, drying and discharging at full speed. Has the traditional advantages of automatic continuous operation, continuous slag discharge, high production capacity, difficult crushing of crystal grains, capability of washing filter residues and the like. The separation efficiency is high, and the water content of the material is less than 3 percent; parts of the machine contacting with materials are all made of stainless steel, so that the machine has good salt brine corrosion resistance. Mother liquor brine thrown out by the centrifuge contains more impurities, is pumped into a filter press through a mother liquor tank and a brine pump, salt slag and silt are obtained by filter pressing, the mother liquor of the filter press is discharged into a brine clarification supply system for clarification, and the clarified clean brine can be pumped into a washing process by the water pump for recycling;
the drying bed in the drying system can be a vibrating type drying bed, and has reliable performance and high drying efficiency.
Further, the screening and packaging unit comprises a rotary screen, an iodine adding device, a mixer and a packaging machine; the feed inlet of the drum screen is connected with the discharge end of the drying system through a bucket elevator; the rotary screen is provided with three-stage discharge ports, each discharge port corresponds to one mixer, and the discharge end of each mixer is correspondingly connected with one packaging machine through a bucket elevator; the iodine adding device is connected with the inlets of the three groups of mixers and can add iodine into the mixers.
The rotary screen can be replaced by a screen with corresponding mesh according to different product granularity required by the market, and if three granularity specifications are screened, the three granularity specifications are 0.15-0.85mm spherical refined salt, 0.85-2.8mm spherical medium particle salt and 2.8-4.0mm spherical large particle salt respectively;
the iodine adding device is an adjustable salt iodine adding machine, and has high iodine adding precision and stable performance.
Compared with the prior art, the method and the device for producing the spherical table salt through mechanical physical shaping have the following advantages that:
(1) through reasonable design of the process flow, the raw salt is used as a raw material, and the raw salt is subjected to the working procedures of feeding, metering, impurity removal, wet autogenous grinding, screening, size mixing, thickening, dehydration, drying, screening and the like, so that the produced spherical salt has good quality, white color and suitable particle size (refined salt products, the content of sodium chloride is more than or equal to 98.5 percent, the whiteness is more than or equal to 75 percent, and the particle size is 0.15-0.85mm is more than or equal to 75 percent; medium-particle salt products, the particle size is 0.85-2.8mm is more than or equal to 75 percent, and the whiteness is more than or equal to 55; large-particle salt products, the particle size is 2.8-4.0mm is more than or equal to 75 percent, and the whiteness is more than or equal to 55) and can meet the demands of markets for the spherical salt with different particle sizes; meanwhile, the whole production line has good reliability, stability and economy;
(2) the wet autogenous mill can control the distribution rate of the grinding granularity interval of the salt by adjusting the rotating speed according to the granularity requirement of the finished product, and can interlock and automatically control the addition of clean brine for size mixing according to the salt feeding amount and the product requirement and design parameters, thereby ensuring that the grinding process is a wet lubrication environment (which is the main condition for producing spherical salt); the salt with unqualified granularity screened out by the vibrating screen can be sent into a wet autogenous mill again for circular grinding; the salt slurry stirring tank is adopted for washing, so that the ground salt slurry is quickly mixed with clean brine to dissolve impurities in salt, and the washing effect is good; the salt slurry in the thickener settles downwards from the upper part, clean brine enters from the lower part, most of washed mother liquor brine overflows from the top of the thickener according to the specific gravity difference between the salt and the brine, and the overflowing mother liquor brine contains fine silt, salt powder and soluble impurities in the salt, so that the purity of the washed salt slurry at the bottom of the thickener is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
FIG. 1 is a schematic view of the production process of spherical table salt by mechanical physical shaping according to the present invention;
FIG. 2 is a block diagram of the production process of spherical table salt by mechanical physical shaping according to the present invention.
Description of the reference numerals:
1-a brine clarification supply system; 2-a loader; 3-a raw salt bin; 4-a constant feeder; 5-picking up and metering belt conveyer; 6-feeding belt conveyor; 7-a deironing device; 8-wet autogenous mill; 9-vibrating screening machine; 10-a salt slurry stirring tank; 11-a belt conveyor; 12-bucket elevator; 13-salt slurry pump; 14-a thickener; 15-a centrifuge; 16-a drying system; 17-a mother liquor tank; 18-a brine pump; 19-a drum screen; 20-an iodine adding device; 21-a mixer; 22-packaging machine.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, the device for producing spherical table salt by mechanical physical shaping comprises a brine clarification supply system 1, and a feeding unit, a metering and conveying unit, a grinding and washing unit, a thickening and washing unit, a dewatering and drying unit and a screening and packaging unit which are sequentially arranged;
the loading unit comprises a loader 2 and a raw salt bin 3 loaded by the loader 2; a grate is arranged on the raw salt bin 3, and an arch breaking device is arranged in the raw salt bin 3;
the metering and conveying unit comprises a quantitative feeder 4 arranged at a discharge port of the raw salt bin 3, a picking and metering belt conveyor 5 connected with an outlet of the quantitative feeder 4, a feeding belt conveyor 6 connected with an outlet of the picking and metering belt conveyor 5, and an iron remover 7 arranged on the feeding belt conveyor 6; the width of the pick-up metering belt conveyor 5 is 1000mm, and the pick-up metering belt conveyor is provided with a weighing metering display device and a salt combing device;
the grinding and washing unit comprises a wet autogenous mill 8, a vibrating screen classifier 9 and a salt slurry stirring tank 10; a feed inlet of the wet autogenous mill 8 is connected with a discharge end of the feeding belt conveyor 6, a material outlet of the wet autogenous mill 8 is connected with a feed end of the vibrating screen classifier 9, and the brine clarification supply system 1 supplies clean brine for the wet autogenous mill 8; the fine material outlet end of the vibrating screen machine 9 is connected with the salt grain inlet end of the salt slurry stirring tank 10, the coarse material outlet end of the vibrating screen machine 9 is connected with the feed inlet of the wet type autogenous mill 8 through a conveying device (the conveying device is a belt conveyor 11 and a bucket elevator 12, the coarse material is conveyed into the bucket elevator 12 through the belt conveyor 11 and then is conveyed back to the feed inlet of the wet type autogenous mill 8 through the bucket elevator 12); the salt slurry outlet end of the salt slurry stirring tank 10 is connected with the salt slurry inlet of the thickening washing unit through a salt slurry pump 13, and the brine clarification supply system 1 supplies clean brine to the salt slurry stirring tank 10;
the thickening washing unit is a thickener 14, and a central settling tube of the thickener 14 is connected with a salt slurry outlet end of the salt slurry stirring tank 10; the middle lower part of the thickener 14 is provided with a clean brine inlet, the top part is provided with a mother liquor brine outlet, and the bottom part is provided with a salt slurry outlet; the brine clarification supply system 1 is connected with the clean brine inlet to supply clean brine to the thickener 14; the brine clarification supply system 1 is connected with a mother liquor brine outlet and receives mother liquor brine discharged from the top of the thickener 14 in an overflowing manner;
the dehydration drying unit comprises a centrifuge 15, a drying system 16 and a mother liquor tank 17; the feed end of the centrifuge 15 is connected with the brine outlet of the thickener 14, the discharge end of the centrifuge 15 is connected with the feed end of the drying system 16 through the belt conveyor 11, the mother liquor brine thrown out by the centrifuge 15 is collected in the mother liquor tank 17, and the outlet end of the mother liquor tank 17 is connected with the brine clarification supply system 1 through the brine pump 18;
the screening and packaging unit comprises a rotary screen 19, an iodine adding device 20, a mixer 21 and a packaging machine 22; the feed inlet of the rotary screen 19 is connected with the discharge end of the drying system 16 through the bucket elevator 12; the rotary screen 19 is provided with three-stage discharge ports, each discharge port corresponds to one mixer 21, the iodine adding device 20 is connected with inlets of the three mixers 21, and iodine is added into the mixers 21; the discharge end of each mixer 21 is correspondingly connected with a packing machine 22 through a bucket elevator 12; the particle size specifications of the three-level discharge port of the rotary screen 19 are 0.15-0.85mm, 0.85-2.8mm and 2.8-4.0mm respectively, and spherical refined salt of 0.15-0.85mm, spherical medium particle salt of 0.85-2.8mm and spherical large particle salt of 2.8-4.0mm can be prepared after mixing with iodine in the respective corresponding mixer 21.
The method for producing the spherical table salt by adopting the device for producing the spherical table salt through mechanical physical shaping comprises the following steps:
s1, adding the crude salt into a crude salt bin by a loader;
s2, uniformly delivering raw salt to a pick-up metering belt conveyor through a quantitative feeder at a raw salt bin discharge port, uniformly flattening and spreading the salt through a salt combing device, manually removing impurities, weighing and metering the raw salt, delivering the raw salt to a feeding belt conveyor, allowing the raw salt to pass through the lower part of an iron remover at a constant speed, adsorbing iron impurities in the raw salt by the iron remover (manually removing iron pin impurities on the iron remover during production stop), and feeding the iron-removed raw salt to a feed port of a wet autogenous mill;
s3, fully mixing raw salt with clean brine provided by a brine clarification supply system in a wet-type autogenous mill, enabling raw salt particles to mutually impact and rub at a certain rotation speed of a cylinder body, subjecting the raw salt particles to crushing and rubbing action, and treating for a certain time to enable all edges and corners of the raw salt particles to be rubbed into round corners to form a round spherical particle state; wherein the volume ratio of the bittern is controlled to be 1: 0.2-2, and controlling the Baume degree of the saturated brine to be 24-25 ℃;
s4, screening the spherical salt in a vibration screening machine; particles larger than 4mm are intercepted by the screen mesh, enter the belt conveyor through the coarse material outlet end, and then return to the feed port of the wet-type autogenous mill by the bucket elevator for feeding and carrying out circular processing; the particles with the diameter less than or equal to 4mm fall from the screen holes and are sent into a salt slurry stirring tank, the salt slurry stirring tank receives clean brine provided by a brine clarification supply system, and the spherical salt particles are washed for one time; wherein, the volume ratio of bittern in the salt slurry stirring tank is controlled to be 1: 3-5;
s5, sending the salt slurry after stirring and washing into a thickener central settling tube through a salt slurry pump, feeding the clean brine provided by a brine clarification supply system into the thickener from the middle lower part, carrying out countercurrent movement of the salt slurry and the clean brine, carrying out secondary washing on the salt slurry, and controlling the volume ratio of the salt slurry to be 1 in the secondary washing: 1-3; the washed mother liquor brine rises to the top of the thickener, overflows and is discharged to a brine clarification supply system for treatment; the thickened salt is slowly settled to the bottom of the thickener and is sent to a centrifuge for dewatering; collecting mother liquor brine thrown out from the centrifuge into a mother liquor tank, and sending the mother liquor brine into a brine clarification supply system by a brine pump in the mother liquor tank for treatment;
s6, conveying the centrifugally dewatered wet salt into a drying system through a belt conveyor for drying to enable the moisture index to meet the national standard requirement of edible salt, and performing dust removal treatment on the generated tail gas to enable the tail gas to reach the national allowable emission standard;
s7, feeding the dried salt into a drum screen through a bucket elevator, wherein the drum screen is provided with three-level discharge holes, and the particle sizes are respectively 0.15-0.85mm, 0.85-2.8mm and 2.8-4.0 mm; screening salt, respectively feeding the screened salt granules with different specifications into respective corresponding mixers, adding iodine into the three mixers by an iodine adding device, uniformly mixing, and respectively feeding into respective corresponding packaging machines for packaging to obtain spherical salt products with three specifications of 0.15-0.85mm spherical refined salt, 0.85-2.8mm spherical medium-particle salt and 2.8-4.0mm spherical large-particle salt.
Example 1
The method for producing the spherical salt by mechanical physical shaping comprises the following steps:
s1, purchasing high-quality sea and lake salt as raw salt, and adding the raw salt into a raw salt bin by a loader;
s2, uniformly delivering raw salt to a pickup metering belt conveyor through a quantitative feeder at a raw salt bin discharge port, wherein the width of the pickup metering belt conveyor is 1000mm, uniformly spreading the raw salt on the pickup metering belt conveyor, manually removing impurities, weighing and metering the raw salt, delivering the raw salt to a feeding belt conveyor, allowing the raw salt to pass under an iron remover at a constant speed, adsorbing iron impurities in the raw salt by the iron remover, and feeding the iron-removed raw salt to a wet autogenous mill feed port;
s3, fully mixing raw salt with clean brine provided by a brine clarification supply system in a wet-type autogenous mill, enabling raw salt particles to mutually impact and rub at a certain rotation speed of a cylinder body, subjecting the raw salt particles to crushing and rubbing action, and treating for a certain time to enable all edges and corners of the raw salt particles to be rubbed into round corners to form a round spherical particle state; wherein, the grinding particle size distribution rate of salt is controlled by adjusting the rotating speed and the feeding amount of the wet autogenous mill and the bittern proportion, and the bittern volume ratio is controlled to be 1: 0.2, controlling the Baume degree of the saturated brine to be 24-25 ℃;
s4, screening the spherical salt in a vibration screening machine; particles larger than 4mm are intercepted by the screen mesh, enter the belt conveyor through the coarse material outlet end, and then return to the feed port of the wet-type autogenous mill by the bucket elevator for feeding and carrying out circular processing; the particles with the diameter less than or equal to 4mm fall from the screen holes and are sent into a salt slurry stirring tank, the salt slurry stirring tank receives clean brine provided by a brine clarification supply system, and the spherical salt particles are washed for one time; wherein, the volume ratio of bittern in the salt slurry stirring tank is controlled to be 1: 3;
s5, sending the salt slurry after stirring and washing into a thickener central settling tube through a salt slurry pump, feeding the clean brine provided by a brine clarification supply system into the thickener from the middle lower part, carrying out countercurrent movement of the salt slurry and the clean brine, carrying out secondary washing on the salt slurry, and controlling the volume ratio of the salt slurry to be 1 in the secondary washing: 1; the washed mother liquor brine rises to the top of the thickener and overflows to be discharged to a brine clarification supply system for treatment; the thickened salt is slowly settled to the bottom of the thickener and is sent to a centrifuge for dewatering; collecting mother liquor brine thrown out from the centrifuge into a mother liquor tank, and sending the mother liquor brine into a brine clarification supply system by a brine pump in the mother liquor tank for treatment;
s6, conveying the centrifugally dewatered wet salt with the moisture content of less than 3% into a drying system through a belt conveyor for drying, wherein the drying bed of the drying system adopts a vibrating drying bed, the dry tail gas is discharged after being dedusted by an environment-friendly dedusting system, and the moisture content of the dried salt is less than 0.3%;
s7, feeding the dried salt into a drum screen through a bucket elevator, wherein the drum screen is provided with three-level discharge holes, and the particle sizes are respectively 0.15-0.85mm, 0.85-2.8mm and 2.8-4.0 mm; salt is sieved, the sieved salt particles with different specifications respectively enter into respective corresponding blenders, iodine is added into the three blenders by an iodine adding device, and after uniform mixing, the salt particles are respectively sent into respective corresponding packaging machines by a bucket elevator to be packaged to obtain spherical salt products with three specifications of 0.15-0.85mm spherical refined salt, 0.85-2.8mm spherical medium particle salt and 2.8-4.0mm spherical large particle salt.
And (3) detection: the content of sodium chloride in the refined granulated salt product is more than or equal to 98.5 percent, the whiteness is more than or equal to 75 percent, and the granularity of 0.15-0.85mm is more than or equal to 75 percent; in the medium-particle salt product, the granularity of 0.85-2.8mm is more than or equal to 75%, and the whiteness is more than or equal to 55; in the large-particle salt product, the particle size of 2.8-4.0mm is more than or equal to 75%, and the whiteness is more than or equal to 55.
Example 2
On the basis of example 1, the difference from example 1 is:
s3, controlling the volume ratio of bittern to be 1:2 in a wet autogenous mill; and S4, controlling the volume ratio of bittern in the salt slurry stirring tank to be 1: 5; and S6, controlling the volume ratio of the bittern in the thickener to be 1: 3.
Through detection: the content of sodium chloride in the refined granulated salt product is more than or equal to 98.5 percent, the whiteness is more than or equal to 75 percent, and the granularity of 0.15-0.85mm is more than or equal to 75 percent; in the medium-particle salt product, the granularity of 0.85-2.8mm is more than or equal to 75%, and the whiteness is more than or equal to 55; in the large-particle salt product, the particle size of 2.8-4.0mm is more than or equal to 75%, and the whiteness is more than or equal to 55.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for producing spherical table salt by mechanical physical shaping is characterized by comprising the following steps:
s1, feeding the crude salt to a crude salt bin;
s2, quantitatively measuring the raw salt, removing iron, and feeding the raw salt into a wet autogenous mill;
s3, mixing the raw salt with the clean brine in a wet autogenous mill, and making the raw salt particles into balls after collision and rubbing;
s4, screening the spherical salt in a screening unit to screen out salt with qualified granularity, and sending the salt into a salt slurry stirring tank for primary stirring and washing;
s5, conveying the salt slurry after stirring and washing into a thickener for secondary washing and thickening, and performing centrifugal dehydration on the salt slurry after washing and settling;
s6, conveying the centrifugally dehydrated wet salt into a drying system for drying;
and S7, conveying the dried salt into a screening and packaging unit to screen salt particles with different particle sizes, and packaging respectively.
2. The method for producing a spherical common salt by mechanical physical shaping as claimed in claim 1, wherein: in the step S3, controlling the volume ratio of bittern in a wet autogenous mill to be 1: 0.2-2, and controlling the Baume degree of the saturated brine to be 24-25 degrees.
3. The method for producing a spherical common salt by mechanical physical shaping as claimed in claim 1, wherein: in the step S4, controlling the volume ratio of bittern in the salt slurry stirring tank to be 1:3 to 5.
4. The method for producing a spherical common salt by mechanical physical shaping as claimed in claim 1, wherein: in the S4, the screened large-particle salt with unqualified particle size can be sent back to the wet autogenous mill to repeat the S3 until the particle size is qualified.
5. The method for producing a spherical common salt by mechanical physical shaping as claimed in claim 1, wherein: in the step S5, the volume ratio of bittern in the secondary washing is controlled to be 1: 1 to 3.
6. The method for producing a spherical common salt by mechanical physical shaping as claimed in claim 1, wherein: in the step S5, the salt slurry after stirring and washing enters from a settling pipe at the center of the thickener, the washing clean brine enters from the middle lower part of the thickener, the salt slurry and the clean brine move in a countercurrent way, the salt slowly settles to the lower part of the thickener, and the washed mother liquor brine rises to the top of the thickener to overflow and be discharged; the washed mother liquor brine discharged from the overflow at the top of the thickener in the S5 and the mother liquor brine generated after the salt slurry is centrifugally dewatered are both sent into a brine clarification supply system to be treated and then can be recycled as clean brine; the brine clarification supply system can provide the required clean brine to the wet autogenous mill in S3, the salt slurry stirred tank in S4, and the thickener in S5.
7. The method for producing a spherical common salt by mechanical physical shaping as claimed in claim 1, wherein: and in the S7, the salt is sieved into three particle sizes, namely 0.15-0.85mm spherical refined salt, 0.85-2.8mm spherical medium particle salt and 2.8-4.0mm spherical large particle salt.
8. A device for producing spherical table salt through mechanical physical shaping is characterized in that: the brine clarifying and supplying device comprises a brine clarifying and supplying system, and a feeding unit, a metering and conveying unit, a grinding and washing unit, a thickening and washing unit, a dewatering and drying unit and a screening and packaging unit which are sequentially arranged;
the discharge end of the feeding unit is connected with the feed end of the metering conveying unit; the discharge end of the metering and conveying unit is connected with a raw salt inlet of the grinding and washing unit; the grinding and washing unit is used for grinding the raw salt particles into a spherical shape, screening qualified particle sizes and then washing the raw salt particles, and the discharge end of the grinding and washing unit is connected with a salt slurry inlet of the thickening and washing unit; the thickening washing unit is used for carrying out secondary washing and thickening on the salt slurry fed into the thickening washing unit, and a salt slurry outlet of the thickening washing unit is connected with an inlet end of the dewatering drying unit; the dehydration drying unit is used for dehydrating and drying the washed and settled salt slurry, and the discharge end of the dehydration drying unit is connected with the feed end of the screening and packaging unit; the screening and packaging unit is used for screening and packaging salt grains with different particle sizes; the brine clarification supply system is used for providing required clean brine to the attrition washing unit and the thickening washing unit, and receiving and processing mother liquor brine produced by the thickening washing unit and the dehydration drying unit.
9. The apparatus for producing a spherical table salt by mechanical physical shaping as set forth in claim 8, wherein: the grinding and washing unit comprises a wet autogenous mill, a vibrating screen classifier and a salt slurry stirring tank; the feed port of the wet autogenous mill is connected with the discharge end of the metering conveying unit, the material outlet of the wet autogenous mill is connected with the feed end of the vibrating screen classifier, and the brine clarification supply system supplies clean brine to the wet autogenous mill; the fine material outlet end of the vibrating screen classifier is connected with the salt grain inlet end of the salt slurry stirring tank, and the coarse material outlet end of the vibrating screen classifier is connected with the feeding hole of the wet-type autogenous mill through a conveying device; the salt thick liquid outlet end of salt thick liquid stirred tank pass through the salt thick liquid pump with the salt thick liquid entry linkage of thickening washing unit, brine clarification supply system does the clean brine of salt thick liquid stirred tank supply.
10. The apparatus for producing a spherical table salt by mechanical physical shaping as set forth in claim 9, wherein:
the loading unit comprises a loader and a raw salt bin loaded by the loader;
the metering and conveying unit comprises a constant feeder arranged at a discharge port of the raw salt bin, a picking and metering belt conveyor connected with an outlet of the constant feeder, a feeding belt conveyor connected with an outlet of the picking and metering belt conveyor, and an iron remover arranged on the feeding belt conveyor; the discharge end of the feeding belt conveyor is connected with the feed inlet of the wet autogenous mill;
the thickening washing unit is a thickener, and a central settling tube of the thickener is connected with a salt slurry outlet end of the salt slurry stirring tank; the middle lower part of the thickener is provided with a clean brine inlet, the top of the thickener is provided with a mother liquor brine outlet, and the bottom of the thickener is provided with a salt slurry outlet; the brine clarification supply system is connected with the clean brine inlet to supply clean brine to the thickener; the brine clarification supply system is connected with the mother liquor brine outlet and is used for receiving the mother liquor brine discharged from the overflow at the top of the thickener;
the dehydration and drying unit comprises a centrifuge, a drying system and a mother liquor tank, wherein the feed end of the centrifuge is connected with a brine outlet of the thickener, the discharge end of the centrifuge is connected with the feed end of the drying system through a belt conveyor, mother liquor brine thrown out by the centrifuge is collected into the mother liquor tank, and the outlet end of the mother liquor tank is connected with the brine clarification supply system through a brine pump;
the screening and packaging unit comprises a drum screen, an iodine adding device, a mixer and a packaging machine; the feed inlet of the drum screen is connected with the discharge end of the drying system through a bucket elevator; the rotary screen is provided with three-stage discharge ports, each discharge port corresponds to one mixer, and the discharge end of each mixer is correspondingly connected with one packaging machine through a bucket elevator; the iodine adding device is connected with inlets of the three groups of mixers and can add iodine into the mixers.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115974213A (en) * | 2022-12-13 | 2023-04-18 | 江苏苏盐井神股份有限公司 | High-nitrate salt washing and floating separation device and process |
| CN116354369A (en) * | 2023-02-13 | 2023-06-30 | 广东省盐业集团广州有限公司 | Aged sea salt powder eluting pure process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1472602A (en) * | 1966-03-25 | 1967-03-10 | Rock salt purification process | |
| CN105293530A (en) * | 2015-11-02 | 2016-02-03 | 中盐工程技术研究院有限公司 | Crushed and washed salt production method and device |
| US20170334733A1 (en) * | 2014-10-23 | 2017-11-23 | Yehuda MAZUZ | Method of Salts Cleaning from Higher Solubility Impurities by Virtue of Homogenization Thereof with a Solvent at a Constant Temperature |
| CN111838639A (en) * | 2020-07-28 | 2020-10-30 | 江苏苏盐井神股份有限公司 | Clean salt dehydrating, drying and packaging system and salt production method |
| US20210371292A1 (en) * | 2020-04-03 | 2021-12-02 | Tianjin University Of Science And Technology | Large-Particle Spherical Salt and Preparation Method Thereof |
-
2022
- 2022-07-22 CN CN202210866615.7A patent/CN115072743A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1472602A (en) * | 1966-03-25 | 1967-03-10 | Rock salt purification process | |
| US20170334733A1 (en) * | 2014-10-23 | 2017-11-23 | Yehuda MAZUZ | Method of Salts Cleaning from Higher Solubility Impurities by Virtue of Homogenization Thereof with a Solvent at a Constant Temperature |
| CN105293530A (en) * | 2015-11-02 | 2016-02-03 | 中盐工程技术研究院有限公司 | Crushed and washed salt production method and device |
| US20210371292A1 (en) * | 2020-04-03 | 2021-12-02 | Tianjin University Of Science And Technology | Large-Particle Spherical Salt and Preparation Method Thereof |
| CN111838639A (en) * | 2020-07-28 | 2020-10-30 | 江苏苏盐井神股份有限公司 | Clean salt dehydrating, drying and packaging system and salt production method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115974213A (en) * | 2022-12-13 | 2023-04-18 | 江苏苏盐井神股份有限公司 | High-nitrate salt washing and floating separation device and process |
| CN115974213B (en) * | 2022-12-13 | 2024-03-22 | 江苏苏盐井神股份有限公司 | High-nitrate floatation separation device and process |
| CN116354369A (en) * | 2023-02-13 | 2023-06-30 | 广东省盐业集团广州有限公司 | Aged sea salt powder eluting pure process |
| CN116354369B (en) * | 2023-02-13 | 2024-02-27 | 广东省盐业集团广州有限公司 | Aged sea salt powder eluting pure process |
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