CN109319809B - Reverse flotation tail salt recycling method and system - Google Patents
Reverse flotation tail salt recycling method and system Download PDFInfo
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- C01D3/00—Halides of sodium, potassium or alkali metals in general
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Abstract
The invention provides a reverse flotation tail salt recovery processing method and a system, wherein the reverse flotation tail salt is foam comprising sodium chloride and carnallite particles, the method comprises the following steps of defoaming processing S1: collecting tail salt foam through a foam collecting box, and mixing defoaming mother liquor into the foam collecting box for defoaming; thickening step S2: sending the defoamed tail salt slurry to a thickener for thickening so as to improve the concentration of the tail salt slurry; washing step S3: sending the concentrated tail salt slurry to a washing tank, adding fresh water into the washing tank, and washing under the stirring action to dissolve carnallite particles in the tail salt slurry; solid-liquid separation step S4: and carrying out solid-liquid separation on the washed tail salt slurry by adopting a solid-liquid separation device to obtain solid-phase sodium chloride and potassium-containing filtrate. The technical scheme of the invention enables the potassium chloride in the reverse flotation tail salt to be reused, and the sodium chloride can meet the requirement of industrial sodium carbonate production raw materials.
Description
Technical Field
The invention relates to the field of resource recycling, in particular to the technical field of reverse flotation tail salt recovery treatment.
Background
As the storage amount of the potash fertilizer in China only accounts for about 1.6 percent of the world, the domestic requirements cannot be met. Therefore, in order to develop national industry and develop domestic resources, the production scale of potash fertilizers is continuously enlarged. A large amount of tail salt is discharged every year, the potassium content of the tail salt is low and is generally less than 2%, and the tail salt cannot be well reused for production at present. In recent years, along with the annual increase of the exploitation amount of potassium salt in a firewood basin, the dilution speed of potassium salt resources is increased, and how to improve the recycling of the potassium resources is a problem which must be faced by the production of potassium fertilizers. Therefore, the flotation tail salt is developed and reused, so that waste materials can be changed into valuable materials, and the resource and environmental pressure can be effectively relieved.
The potassium chloride fertilizer is produced by using soluble sylvite ore carnallite and sylvite as main material and through a floatation process. The principle of the flotation method is that the mineral particles are gathered at the liquid-gas interface through the hydrophobic characteristic of the surfaces of the mineral particles or the hydrophobic characteristic obtained after the action of a flotation agent is added. The direct flotation method and the reverse flotation method are commonly used.
The reverse flotation method is that carnallite pulp is mixed with chemical agent in a flotation tank, and is stirred and aerated to lead sodium chloride particles to float upwards and be scraped out along with the tail salt foam, and carnallite is left in the pulp, low-sodium carnallite is obtained through dehalogenation, the low-sodium carnallite enters a crystallizer, water is added for decomposition and crystallization, and then potassium chloride products are obtained through filtration and washing.
The reverse flotation tail salt is sodium chloride tail material discharged in the reverse flotation production process, wherein a small amount of carnallite particles are generally entrained, and the tail salt is required to contain KCl less than 5.0 percent and is generally controlled to be 2.0 to 3.0 percent according to the control index of the reverse flotation process. Sometimes the KCl content can even reach about 6-8% due to process control problems.
At present, no effective treatment mode is available for reverse flotation tail salt, reverse flotation tail salt foam slurry is generally directly discharged to a tail salt pond, a liquid phase is returned to a carnallite salt field in the tail salt pond through sedimentation, after a solid phase is accumulated to a certain thickness in the tail salt pond, the tail salt slurry is switched to another tail salt pond, the liquid phase in the pond is drained, and the tail salt solid phase is mechanically extracted and stacked in the open air. For a long time, the stacking site of the tail salt is larger and larger. As the potassium chloride contained in the tail salt cannot be effectively utilized, and the sodium chloride cannot be directly used for other industrial production, the waste of resources is undoubted.
Disclosure of Invention
The invention aims to provide a method and a system for recycling reverse flotation tail salt, aiming at the problem that reverse flotation tail salt cannot be effectively utilized in the prior art.
According to a first aspect of the present invention, there is provided a reverse flotation tail salt recovery processing method, wherein the reverse flotation tail salt is foam including sodium chloride and carnallite particles, the method includes the following steps, defoaming processing S1: collecting tail salt foam through a foam collecting box, and mixing defoaming mother liquor into the foam collecting box for defoaming; thickening step S2: sending the defoamed tail salt slurry to a thickener for thickening so as to improve the concentration of the tail salt slurry; washing step S3: sending the concentrated tail salt slurry to a washing tank, adding fresh water into the washing tank, and washing under the stirring action to dissolve carnallite particles in the tail salt slurry; solid-liquid separation step S4: and carrying out solid-liquid separation on the washed tail salt slurry by adopting a solid-liquid separation device to obtain solid-phase sodium chloride and potassium-containing filtrate.
Optionally, the densifying step S2 further includes: after the tail salt slurry is subjected to thickening treatment by the thickener, the solid-phase volume concentration of the tail salt slurry is increased to 40-60%.
Optionally, the step S2 of thickening further comprises returning the supernatant produced in the thickener to the salt pan for producing carnallite again.
Optionally, the washing step S3 further includes: the addition amount of the fresh water is 7-12% of the volume of the thickened tail salt slurry.
Optionally, the solid-liquid separation step S4 further includes: the solid-liquid separation device comprises one of a plate filter, a bag filter and a belt filter.
Optionally, the solid-liquid separation step S4 further includes: and adding fresh water to elute at the middle section of the solid-liquid separation process of the solid-liquid separation device so as to reduce the mother liquor carried in the solid phase.
Optionally, the solid-liquid separation step S4 further includes: supplying the solid-phase sodium chloride to the industrial soda industry for use; and returning the potassium-containing filtrate to the salt pan to produce the carnallite again.
According to a second aspect of the invention, a reverse flotation tail salt recovery processing system is provided, wherein the reverse flotation tail salt is foam comprising sodium chloride and carnallite particles, the system comprises a foam collecting box, a defoaming box and a defoaming device, wherein the foam collecting box is used for collecting tail salt foam and defoaming the tail salt foam by mixing defoaming mother liquor; the thickener is connected behind the foam collecting box, receives the defoamed tail salt slurry and thickens the tail salt slurry so as to improve the concentration of the tail salt slurry; the washing tank is connected behind the thickener, receives the thickened tail salt slurry, adds fresh water and washes the tail salt slurry under the stirring action so as to dissolve carnallite particles in the tail salt slurry; and the solid-liquid separation device is connected behind the washing tank and used for carrying out solid-liquid separation on the washed tail salt slurry so as to obtain solid-phase sodium chloride and potassium-containing filtrate.
Optionally, after the thickener thickening treatment, the solid phase volume concentration of the tail salt slurry is increased to 40-60%.
Optionally, the supernatant liquor produced in the thickener is returned to the salt pan for the production of carnallite again.
Optionally, the addition amount of the fresh water is 7-12% of the volume of the thickened tail salt slurry.
Optionally, the solid-liquid separation device comprises one of a plate filter, a bag filter and a belt filter.
Optionally, a fresh water rinse is added in the middle section of the solid-liquid separation process of the solid-liquid separation device to reduce the mother liquor entrained in the solid phase.
Alternatively, the solid phase sodium chloride is supplied for use by the industrial soda industry; and returning the potassium-containing filtrate to the salt pan to produce the carnallite again.
The technical scheme of the invention has the advantages that:
1) according to the technical scheme of the invention, potassium chloride in the reverse flotation tail salt can be recycled, and sodium chloride can meet the requirement of industrial soda ash production raw materials for use, so that the waste of resources is avoided, and the utilization rate of reverse flotation tail salt resources is greatly improved;
2) the technical scheme of the invention has simple process flow and no waste material, the generated liquid phase can be returned to the salt pan to produce the carnallite again, and the generated solid phase can be used for producing the soda ash, thereby realizing the cyclic utilization of resources.
Drawings
Figure 1 shows a flow diagram of a reverse flotation tailing recovery process according to the present invention.
Figure 2 shows a schematic diagram of a reverse flotation tail salt recovery processing system according to the present invention.
Detailed Description
In the following detailed description of the preferred embodiments of the invention, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration, specific features of the invention, such that the advantages and features of the invention may be more readily understood and appreciated. The following description is an embodiment of the claimed invention, and other embodiments related to the claims not specifically described also fall within the scope of the claims.
Figure 1 shows a flow diagram of a reverse flotation tailing recovery process according to the present invention.
As shown in fig. 1, a reverse flotation tailing recycling treatment method is provided, wherein the reverse flotation tailing is foam containing sodium chloride and carnallite particles, and the method comprises the following steps, defoaming treatment S1: collecting tail salt foam through a foam collecting box, and mixing defoaming mother liquor into the foam collecting box for defoaming; thickening step S2: sending the defoamed tail salt slurry to a thickener for thickening so as to improve the concentration of the tail salt slurry; washing step S3: sending the concentrated tail salt slurry to a washing tank, adding fresh water into the washing tank, and washing under the stirring action to dissolve carnallite particles in the tail salt slurry; solid-liquid separation step S4: and carrying out solid-liquid separation on the washed tail salt slurry by adopting a solid-liquid separation device to obtain solid-phase sodium chloride and potassium-containing filtrate.
The reverse flotation tail salt refers to froth containing sodium chloride particles which is scraped out in a reverse flotation tank in an upward floating mode, and a small amount of carnallite particles are also entrained in the reverse flotation tail salt froth due to the control problem of a reverse flotation process, but silt is rarely entrained in the reverse flotation tail salt froth. The main components of the carnallite particle are potassium chloride and a small amount of magnesium chloride, and the carnallite particle is easy to dissolve in water. The technical scheme of the invention aims to separate sodium chloride and carnallite particles in reverse flotation tail salt foam to obtain a sodium chloride solid phase and a potassium-containing liquid phase with higher purity.
Since the reverse flotation tailing salt exists in the form of foam, it is first necessary to perform defoaming treatment S1 by mixing a large amount of defoaming mother liquor in a foam collecting tank and defoaming the reverse flotation tailing salt foam by dilution and mechanical collision. The defoaming mother liquor can be decomposed liquor of a crystallizer in a reverse flotation process, and can also be saturated solution containing potassium chloride, magnesium chloride and sodium chloride or saturated solution of other brine.
And defoaming the reverse flotation tail salt to form reverse flotation tail salt slurry, and thickening in a thickener. Because the solid content of the reverse flotation tailing slurry after defoaming is low, preliminary concentration is required. The thickener is a solid-liquid separation device based on gravity settling effect, and is generally a cylindrical shallow groove with a conical bottom, which is built by taking concrete, wood or a metal welding plate as a structural material. Generally, the ore pulp with the solid content of 10-20 percent can be concentrated into underflow ore pulp with certain concentration through gravity settling, and the thickened underflow ore pulp is discharged from a underflow opening at the bottom of the thickener under the action of a rake which is arranged in the thickener and runs at a slow speed. The cleaner clear liquid generated at the upper part of the thickener is discharged from an annular chute at the top.
And (3) the concentrated reverse flotation tailing salt slurry enters a washing tank, and because carnallite particles are easy to dissolve in water, fresh water is added into the washing tank to completely dissolve a small amount of carnallite particles in the reverse flotation tailing salt slurry. The purpose of this step is to remove impurities, dissolve carnallite particles entrained in the solid phase into the liquid phase, and increase the sodium chloride content of the solid phase. The amount of fresh water added into the washing tank needs to be controlled properly, because the production period of returning the potassium-containing liquid phase to the salt pan is influenced by too much added water, and the grade of the final solid-phase sodium chloride is influenced by too little added water.
Because the sodium chloride in the reverse flotation tail salt floats upwards along with the foam and is scraped out, the particle size is smaller, and the silt content is less, the solid-liquid separation step can be directly carried out after the washing is finished, and other operations are not needed. And carrying out solid-liquid separation on the washed reverse flotation tail salt slurry through a solid-liquid separation device, thereby achieving the purpose of dehydrating solid-phase sodium chloride. After solid-liquid separation, a sodium chloride solid phase with higher purity and a potassium-containing filtrate can be directly obtained.
Optionally, the densifying step S2 further includes: after the tail salt slurry is subjected to thickening treatment by the thickener, the solid-phase volume concentration of the tail salt slurry is increased to 40-60%.
The defoamed reverse flotation tail salt slurry with low solid content can be concentrated into underflow slurry of 40-60% by the gravity settling action in the thickener, and the underflow slurry can flow out of a underflow opening at the bottom of the thickener and then enter a washing tank.
Optionally, the step S2 of thickening further comprises returning the supernatant produced in the thickener to the salt pan for producing carnallite again.
The supernatant liquor produced by the thickener is discharged from an annular chute at the top of the thickener and returns to the salt pan, and the carnallite ore is produced again after the magnesium-potassium ratio is adjusted. Thus, the waste of resources and the pollution to the environment can be avoided.
Optionally, the washing step S3 further includes: the addition amount of the fresh water is 7-12% of the volume of the thickened tail salt slurry.
Fresh water is added into the washing tank to dissolve and wash a small amount of carnallite in the reverse flotation tail salt slurry, the magnesium chloride in the carnallite has low content and high solubility, and the carnallite can be dissolved along with potassium chloride generally. The amount of the fresh water added may be determined by the solid phase component in the reverse flotation tail salt slurry, for example, KCl-NaCl-MgCl is used based on the content of potassium chloride2-H2And calculating the water quantity of the dissolved potassium chloride by using an O quaternary water salt system phase diagram. For example, the amount of fresh water for dissolving potassium chloride and magnesium chloride is calculated to be different according to the solid phase component or the content of each component of different slurries. Or according to an empirical formula, wherein the empirical formula can be, for example, a formula summarized by stabilizing the composition of the slurry produced under the same process conditions summarized in the production process within a certain range and summarizing the washing effect which can be achieved by adding water according to experience. By combining the method, the addition amount of fresh water added into the washing tank in the technical scheme of the invention can be 7-12% of the volume of the anti-flotation tail salt slurry after thickening.
Optionally, the solid-liquid separation step S4 further includes: the solid-liquid separation device comprises one of a plate filter, a bag filter and a belt filter.
The plate frame filter is the first machine used in chemical dewatering. Although the plate-and-frame filter is generally operated intermittently, the capital equipment investment is large, and the filtering capacity is low, the plate-and-frame filter has the advantages of large filtering driving force, high solid content of filter cakes, clear filtrate, high solid recovery rate, low conditioning medicine consumption and the like, and is widely applied to some fields.
The bag filter is a multipurpose filtering device which has the advantages of novel structure, small volume, simple and flexible operation, energy conservation, high efficiency, closed work and strong applicability. Bag filters are a new type of filtration system. The bag filter is internally provided with a metal mesh basket for supporting a filter bag, liquid flows in from an inlet, flows out from an outlet after being filtered by the filter bag, impurities are intercepted in the filter bag, and the filter bag can be continuously used after being replaced.
The belt filter is also called a chain belt filter, is one kind of continuous filter and is a new type of high-efficiency dewatering equipment. The operation condition is similar to a belt conveyor, slurry is dehydrated, solid and liquid are separated, and dregs are filtered in the conveying process. There are two types of structural forms: pressurized and depressurized. The former is more common, and the pressure-dividing filter and the squeezer are two types; the latter is a vacuum filter. The belt filter can be formed into a plurality of different machine types due to different arrangements and combinations of the press rolls. The plate-and-frame filter press has the advantages of simple structure, high dewatering efficiency, large treatment capacity, low energy consumption, low noise, high automation degree, continuous operation, easy maintenance and the like, and the cost and the operating cost of the plate-and-frame filter press are reduced by more than 30 percent compared with those of a plate-and-frame filter press.
Because the particle size of the sodium chloride in the reverse flotation tail salt is fine, a centrifugal machine cannot be used for centrifugal dehydration so as to avoid the phenomenon of precipitation and penetration and further influence the yield of the solid-phase sodium chloride. Preferably, a belt filter can be used for carrying out solid-liquid separation and dehydration on the reverse flotation tail salt slurry after washing is finished, and the best effect is achieved.
Optionally, the solid-liquid separation step S4 further includes: and a fresh water leaching layer can be added at the middle section of the solid-liquid separation process of the solid-liquid separation device to reduce the mother liquor carried in the solid phase.
At the middle section of the solid-liquid separation process of the solid-liquid separation device, most of water in the solid phase is removed, and at the moment, a fresh water leaching process is added to leach potassium chloride and magnesium chloride contained in mother liquor carried in the solid phase, so that the purity of the solid phase sodium chloride is further improved, and the purity of the solid phase sodium chloride can meet the raw material requirement of industrial sodium carbonate production. Meanwhile, the fresh water leaching is arranged in the middle section, so that the dehydration can be continued after the solid phase leaching, and the dehydration is basically finished when the solid phase leaching leaves the solid-liquid separation device, thereby meeting the industrial requirements. For example, in the actual operation process, the belt length can reach 20-30 m, most of water is removed when the separated solid phase runs from one end to the middle section of the belt filter cloth, a fresh water leaching is added, the machine still runs for a period of time after the purity of sodium chloride in the solid phase is further improved, and the solid phase still continues to be dehydrated for a period of time, so that the dehydration can be completed when the solid phase runs to the other end of the belt filter cloth, and the production requirement of industrial soda is met. The operation can achieve the purposes of solid-liquid separation and dehydration, can further improve the purity of the solid-phase sodium chloride, and is simple and practical and good in effect.
Optionally, the solid-liquid separation step S4 further includes: supplying the solid-phase sodium chloride to the industrial soda industry for use; and returning the potassium-containing filtrate to the salt pan to produce the carnallite again.
The purity and the water content of the solid-phase sodium chloride obtained according to the technical scheme of the invention can meet the production requirements of industrial sodium carbonate, and can be directly used in the sodium carbonate industry, such as the production processes of sodium carbonate, such as a Lumbran method, a Soxhlet alkali-making method, a Hough alkali-making method and the like. And returning the potassium-containing filtrate to a salt pan, adjusting the magnesium-potassium ratio, and then producing the carnallite again, so that the waste of resources and the environmental pollution can be avoided.
According to the technical scheme, potassium chloride in the reverse flotation tail salt is transferred to a liquid phase for recycling through a dissolving and washing process, and meanwhile, a qualified sodium chloride product required by the chemical industry is obtained.
According to the technical scheme of the invention, the reverse flotation tail salt is fully utilized, no waste material is discharged, the generated liquid phase can be returned to a salt pan to produce carnallite again, the generated solid phase can be used for producing sodium carbonate, and the cyclic utilization of resources is realized.
Figure 2 shows a schematic diagram of a reverse flotation tail salt recovery processing system according to the present invention.
As shown in fig. 2, a reverse flotation tail salt recovery processing system is provided, wherein the reverse flotation tail salt is foam comprising sodium chloride and carnallite particles, the system comprises a foam collecting box M1 for collecting tail salt foam and defoaming the tail salt foam by mixing defoaming mother liquor; a thickener M2 connected to the rear of the foam collecting tank M1, for receiving the defoamed tail salt slurry and thickening the tail salt slurry to increase the concentration of the tail salt slurry; a washing tank M3 connected to the rear of the thickener M2, receiving the thickened tail salt slurry, adding fresh water and washing under the stirring action to dissolve carnallite particles in the tail salt slurry; and a solid-liquid separation device M4 connected to the washing tank M3, for performing solid-liquid separation on the washed tail salt slurry to obtain solid-phase sodium chloride and a potassium-containing filtrate.
Optionally, after the thickening treatment by the thickener M2, the solid phase volume concentration of the tail salt slurry is increased to 40-60%.
Optionally, the supernatant produced in the thickener M2 is returned to the salt pan for the production of carnallite again.
Optionally, the addition amount of the fresh water is 7-12% of the volume of the thickened tail salt slurry.
Optionally, the solid-liquid separation device M4 comprises one of a plate filter, a bag filter and a belt filter.
Optionally, the solid-liquid separation device M4 adds a fresh water rinse in the middle of the solid-liquid separation process to reduce the mother liquid carried in the solid phase.
Alternatively, the solid phase sodium chloride is supplied for use by the industrial soda industry; and returning the potassium-containing filtrate to the salt pan to produce the carnallite again.
The system of the present invention has been described and explained in detail above in connection with the method, and will not be described in detail here.
The following is a description of specific experimental test data for one embodiment. For example, 2500mL of concentrated reverse flotation tailing slurry with a volume concentration of 50% is taken, and the composition of the components in the solid phase and the liquid phase is shown in Table 1; taking 2500mL of the same concentrated tail salt slurry, adding 250mL of fresh water into the concentrated tail salt slurry to wash and dissolve carnallite particles, and then continuing to process the tail salt slurry according to the technical scheme of the invention to obtain a sample, wherein the composition of the solid phase and the liquid phase is shown in Table 2.
TABLE 1
| Sample name | KCl％ | NaCl％ | MgCl2％ | CaSO4％ | Weight (kg) |
| Solid phase | 0.2 | 94.5 | 1.1 | 1.6 | 0.6 |
| Liquid phase | 2.7 | 1.6 | 26.5 | 0.3 | 3.1 |
TABLE 2
As can be seen from the data in tables 1 and 2, the mass fraction of sodium chloride in the solid phase obtained from the reverse flotation tail salt slurry treated by the technical scheme of the present invention is obviously increased from 86.0% to 94.5%, that is, the slurry solid phase not treated by the technical scheme of the present invention cannot be used for the production of industrial soda ash, and the solid phase sodium chloride treated by the technical scheme of the present invention can meet the requirements of the production of industrial soda ash. The technical scheme of the invention can effectively improve the utilization rate of the reverse flotation tail salt resource.
The technical scheme of the invention has the advantages that:
1) according to the technical scheme of the invention, potassium chloride in the reverse flotation tail salt can be recycled, and sodium chloride can meet the requirement of industrial soda ash production raw materials for use, so that the waste of resources is avoided, and the utilization rate of reverse flotation tail salt resources is greatly improved;
2) the technical scheme of the invention has simple process flow and no waste material, the generated liquid phase can be returned to the salt pan to produce the carnallite again, and the generated solid phase can be used for producing the soda ash, thereby realizing the cyclic utilization of resources.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Claims (8)
1. A reverse flotation tail salt recovery processing method, wherein the reverse flotation tail salt is foam comprising sodium chloride and carnallite particles, the method comprises the following steps,
defoaming treatment (S1):
the tail salt foam is collected by a foam collecting box,
defoaming mother liquor is mixed into the foam collecting tank for defoaming treatment, wherein the defoaming mother liquor is decomposition liquor of a crystallizer in a reverse flotation process, or saturated solution containing potassium chloride, magnesium chloride and sodium chloride, or saturated solution of brine;
thickening step (S2):
sending the defoamed tail salt slurry to a thickener for thickening, increasing the solid phase volume concentration of the tail salt slurry to 40-60% so as to increase the concentration of the tail salt slurry, and returning upper clear liquid generated in the thickener to a salt field for producing carnallite again;
washing step (S3):
sending the thickened tail salt slurry to a washing tank, adding fresh water into the washing tank, and washing under the stirring effect to dissolve carnallite particles in the tail salt slurry, wherein the addition amount of the fresh water is 7-12% of the volume of the thickened tail salt slurry;
solid-liquid separation step (S4):
and carrying out solid-liquid separation on the washed tail salt slurry by adopting a solid-liquid separation device to obtain solid-phase sodium chloride and potassium-containing filtrate.
2. The method of claim 1, the solid-liquid separating step (S4) further comprising:
the solid-liquid separation device comprises one of a plate filter, a bag filter and a belt filter.
3. The method of claim 1, the solid-liquid separating step (S4) further comprising:
and adding fresh water to elute at the middle section of the solid-liquid separation process of the solid-liquid separation device so as to reduce the mother liquor carried in the solid phase.
4. The method of claim 1, the solid-liquid separating step (S4) further comprising:
supplying the solid-phase sodium chloride to the industrial soda industry for use;
and returning the potassium-containing filtrate to the salt pan to produce the carnallite again.
5. A reverse flotation tail salt recovery processing system, wherein the reverse flotation tail salt is a froth including sodium chloride, carnallite particles, the system includes,
the tail salt foam is subjected to defoaming treatment by mixing defoaming mother liquor, wherein the defoaming mother liquor is decomposition liquor of a crystallizer in a reverse flotation process, or saturated solution containing potassium chloride, magnesium chloride and sodium chloride, or saturated solution of brine;
the thickener is connected behind the foam collecting box, receives and thickens defoamed tail salt slurry to improve the concentration of the tail salt slurry, the solid phase volume concentration of the tail salt slurry is improved to 40-60%, and supernatant liquor generated in the thickener returns to a salt field to produce carnallite again;
the washing tank is connected behind the thickener, receives the thickened tail salt slurry, adds fresh water and washes the tail salt slurry under the stirring action so as to dissolve carnallite particles in the tail salt slurry, and the addition amount of the fresh water is 7-12% of the volume of the thickened tail salt slurry;
and the solid-liquid separation device is connected behind the washing tank and used for carrying out solid-liquid separation on the washed tail salt slurry so as to obtain solid-phase sodium chloride and potassium-containing filtrate.
6. The system of claim 5, wherein,
the solid-liquid separation device comprises one of a plate filter, a bag filter and a belt filter.
7. The system of claim 5, further comprising,
and a fresh water leaching is added in the middle section of the solid-liquid separation process of the solid-liquid separation device to reduce the mother liquor carried in the solid phase.
8. The system of claim 5, wherein,
the solid-phase sodium chloride is supplied to the industrial soda industry for use;
and returning the potassium-containing filtrate to the salt pan to produce the carnallite again.
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