Salt pan sodium salt pond plate manufacturing method
By forming a foundation layer and multiple high sodium salt layers in the salt field, combined with sprinkler and rolling technology, a sodium salt bath plate with high strength and low permeability is formed, which solves the problems of complex construction, long cycle and low strength of existing sodium salt bath plates, and achieves rapid and powerful sodium salt bath plate construction.
Patent Information
- Application Number
- CN202411833985.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-03-04
AI Technical Summary
The existing sodium salt pond panel construction methods are complex, long cycles, and low strength, which affects the normal production of salt ponds and leads to waste of mineral resources.
The method of making a sodium salt pond in Yantian is adopted, including the formation of the foundation layer, the laying and rolling of multiple high sodium salt layers, and the primary and secondary sodium salt layers are formed by sprinkling water and rolling, and the permeability and strength are detected until the threshold is reached.
It greatly shortens the construction cycle of sodium salt pond panels, improves the strength of sodium salt pond panels, reduces leakage rate, avoids waste of resources, and simplifies the construction process.
Smart Images
Figure CN119551694A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of salt field production, in particular to a method for manufacturing salt field sodium salt pool plates. Background Art
[0002] Salt lake brine is rich in minerals such as potassium, lithium and sodium, and is the main raw material for the production of potassium and lithium. Figure 1 As shown, the raw brine is first dried in a sodium salt pool to precipitate sodium chloride. When the brine reaches point E (saturation point of potassium chloride, sodium chloride and carnallites), it is introduced into the carnallites pool to produce carnallites for potash fertilizer production. When the brine reaches point F (saturation point of bischofite, sodium chloride and carnallites), it is introduced into the old brine pool for storage and used for production of lithium carbonate by lithium adsorption extraction method. The tail brine after adsorption is mixed with fresh water and returned to the mining area to continue dissolving the ore.
[0003] In the carnallite pool, the cutting head of the water mining ship can easily destroy the compacted soil layer at the bottom of the pool, and the turned-up soil will mix into the carnallite, which is not conducive to subsequent processing; the turned-up soil will also be mixed into the brine during the next drying, hindering the crystallization of carnallite, reducing the particle size of carnallite, reducing production, and causing a waste of potassium resources. The destruction of the compacted soil layer at the bottom of the pool will cause brine leakage, resulting in the loss of potassium resources. In the old brine pool, due to the strong winds in the salt lake area all year round, the old brine waves will mix the mud at the bottom of the pool into the adsorbent, resulting in the blockage of the channels of the adsorbent structure, causing the adsorption capacity of the adsorbent to decrease, the pressure of the adsorption tower to increase, and the adsorbent to be easily damaged. In addition, after the mud enters the adsorption tower, when the lithium ions are desorbed from the adsorption bed, a large amount of silica will be brought into the desorption liquid, which cannot be completely removed in the intermediate process and is eventually brought into the lithium carbonate product, resulting in excessive silicon in the lithium carbonate product and reducing the quality of the lithium carbonate product.
[0004] Therefore, no matter the carnallite pool or the old brine pool, sodium salt pool boards need to be laid on the bottom. The existing laying method is to introduce the original brine into the salt field, dry it on the beach to precipitate a sodium salt layer, roll it, and then continue to introduce the original brine to precipitate a secondary sodium salt layer, roll it, and repeat this cycle 3-4 times until the thickness of the sodium salt layer is more than 20 cm. The construction time is more than 2 years.
[0005] However, the existing sodium salt pool plate manufacturing method has a complex construction process and a long cycle, which affects the normal production of the salt pool; the sodium salt pool plate has low strength, and after being damaged by the cutting head of the water mining ship or wind and waves, mud will be mixed into the slurry, affecting subsequent production, and ultimately reducing product yield and grade. The salt field leakage rate is high (above 0.8mm / d), resulting in a waste of mineral resources.
[0006] The purpose of the invention is to solve the problems that the existing sodium salt pool board construction method is complicated, the cycle is long, the strength of the sodium salt pool board is low, the normal production is affected and resources are wasted. Summary of the invention
[0007] In order to solve the above problems, the present invention provides a method for manufacturing a salt pan sodium salt pool plate, comprising the following steps: a base layer forming step S1, flattening and compacting the soil at the bottom of the salt pan 1 to form a salt pan base layer 12. A high sodium salt layer laying step S2, laying a high sodium salt layer of a certain thickness on the salt pan base layer 12, and rolling it flat. A primary sodium salt layer forming step S3, sprinkling an appropriate amount of fresh water into the high sodium salt layer, flattening and compacting it, and repeating it multiple times to form a primary sodium salt layer 2.
[0008] In the secondary sodium salt layer forming step S4, a certain amount of high sodium brine is added to the salt pan 1 for drying. When the sodium chloride crystals precipitated from the high sodium brine reach a certain thickness, the high sodium brine is discharged, and the crystals are flattened and compacted after drying to form a secondary sodium salt layer 3 on the primary sodium salt layer 2. In the detection step S5, the primary sodium salt layer 2 and the secondary sodium salt layer 3 are used as the sodium salt pool plates of the salt pan, and the permeability and strength are detected to obtain the permeability value and the strength value. If the permeability value is less than the permeability threshold and the strength value is greater than the strength threshold, the sodium salt pool plate 4 is manufactured. Otherwise, the process returns to the secondary sodium salt layer forming step S4 until the permeability of the sodium salt pool plate 4 is less than the permeability threshold and the strength value is greater than the strength threshold.
[0009] Preferably, in the base layer forming step S1, when the soil at the bottom of the salt pan 1 is rolled and compacted, the moisture content of the soil is controlled within a range of 8% to 10%.
[0010] Preferably, in the base layer forming step S1, the compaction degree of the soil is controlled to be ≥93%.
[0011] Preferably, in the high sodium salt layer laying step S2, the thickness of the high sodium salt layer is set to 30-40 cm.
[0012] Preferably, in the primary sodium salt layer forming step S3, the thickness of the primary sodium salt layer 3 is ≥20 cm.
[0013] Preferably, in the secondary sodium salt layer forming step S4, high sodium brine is added to the salt pan 1 so that the depth of the high sodium brine in the salt pan 1 is 40-60 cm.
[0014] Preferably, in the secondary sodium salt layer forming step S4, when the thickness of sodium chloride crystals precipitated from the high-sodium brine reaches 3-5 cm, the high-sodium brine in the salt pan is drained.
[0015] Preferably, in the detection step S5, the permeability threshold is 0.3 mm / d and the strength threshold is 50 kPa.
[0016] Preferably, the salt used for laying the high sodium salt layer is granular salt naturally precipitated from a sodium salt pond, with a sodium chloride content of ≥83% and an adsorption mother liquor content of ≤15%.
[0017] The present invention can greatly shorten the construction period of the sodium salt pool plate in Salt Pan 1, and the construction period is reduced from more than two years required by the existing manufacturing method to within three months, thereby reducing the impact on the production of Salt Pan 1. The strength of the sodium salt pool plate in Salt Pan 1 can also be greatly improved to prevent it from being damaged by the cutting head of the water mining ship, resulting in mud mixed into the slurry and reducing the grade of the potassium chloride product. The mud blown up by the strong wind is prevented from entering the lithium carbonate adsorption tower to cause the blockage of the adsorbent channel, and the decrease in the adsorption capacity of the adsorbent is avoided, thereby improving the yield and output of lithium. When lithium ions are desorbed from the adsorption bed, silicon dioxide is prevented from entering the desorption liquid, avoiding the problem of excessive silicon in the lithium carbonate product, thereby improving the quality of lithium.
[0018] In addition, the leakage rate of the salt field 1 can be greatly reduced, the waste of mineral resources can be reduced, and the yield can be improved. Moreover, the construction is simple, and only the bottom of the pool and the high sodium salt need to be sprinkled with water, rolled, and the original brine crystals can be poured in to form a hardened surface. Finally, the large amount of high sodium salt ore produced by the sodium salt pool can be used to increase the value of the solid waste high sodium ore, which is suitable for large-scale industrial salt field production. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 .Salt field production flow chart; Figure 2 . Schematic diagram of the process for producing sodium salt pool plates in salt fields; Figure 3 .Schematic diagram of the sodium salt pool plate structure.
[0020] In the figure, 1. salt pan, 11. dam, 12. salt pan base layer, 2. primary sodium salt layer, 3. secondary sodium salt layer, 4. sodium salt pool plate. DETAILED DESCRIPTION
[0021] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0022] like Figure 2 and Figure 3 As shown, the method for making a salt pan sodium salt pool plate includes a base layer forming step S1, cleaning up the debris in the salt pan 1, leveling the soil at the bottom of the salt pan 1, keeping the soil at a certain humidity, and then rolling and compacting it with a compactor to form a salt pan base layer 12.
[0023] The salt pan 1 is formed by enclosing a dam 11, and the bottom of the salt pan 1 is a soil layer.
[0024] When the soil at the bottom of Salt Field 1 is rolled and compacted, the moisture content of the soil is between 8% and 10%. When the moisture content of the soil is lower than this range, it should be sprinkled with water. When it is higher than this range, it should be spread out for drying. When rolling, the moisture content should be controlled at ±2% of the optimal moisture content. The rolling speed should not exceed 10 km / h. It should be ensured that there are no dead corners and the rolling is uniform. The compactor should roll 3 to 5 times.
[0025] After the soil is rolled and compacted, the compaction degree of the soil should be ≥93%. The compaction degree test adopts the ring knife method or nuclear density meter method, and the test frequency is every 2000 m 2 Check 8 points, less than 200 m 2 At least 2 points should be tested.
[0026] The high sodium salt layer laying step S2 is to lay a high sodium salt layer of a certain thickness on the salt pan base layer 12 and use a compactor to roll it flat.
[0027] The thickness of the high sodium salt laid on the salt pan base layer 12 is 30-40 cm, and it is compacted 2-3 times using a compactor. The compaction speed should not exceed 10-15 km / h, and it should be ensured that there are no dead corners and the compaction is uniform.
[0028] High sodium salt is the granular salt naturally precipitated from the sodium salt pond and cannot be the high sodium salt from the reverse flotation tailing salt pond. The sodium chloride content should be ≥83% and the adsorption mother liquor volume should be ≤15%.
[0029] The primary sodium salt layer forming step S3 is to sprinkle a proper amount of fresh water into the high sodium salt layer, flatten and compact it, and repeat the process for multiple times to form a primary sodium salt layer 2, wherein the thickness of the primary sodium salt layer 2 is ≥20 cm.
[0030] Sprinkle an appropriate amount of fresh water into the high-sodium salt layer to allow the fresh water to fully penetrate the high-sodium salt layer. The purpose of sprinkling water is to wash away the adsorbed mother liquor on the surface of the high-sodium salt, and to dissolve part of the high-sodium salt so that it can be hardened, while reducing the porosity between the high-sodium salts in the high-sodium salt layer.
[0031] Sprinkle an appropriate amount of fresh water and use a compactor to flatten it. The rolling speed should not exceed 10 km / h. Make sure there are no dead corners and the rolling is uniform. Then, sprinkle fresh water again and dry it, then roll it again. Repeat the above operation more than 5 times to achieve the purpose of compaction of the high sodium salt layer, reduce the porosity and increase the strength.
[0032] The flatness of the high sodium salt layer after compaction is ±10cm, and the compaction degree is not less than 93%.
[0033] In the secondary sodium salt layer forming step S4, a certain amount of high sodium brine is added to the salt pan 1 for drying. After the sodium chloride crystals precipitated from the high sodium brine reach a certain thickness, the high sodium brine is discharged, and the crystals are flattened and compacted after drying to form a secondary sodium salt layer 3.
[0034] The amount of high sodium brine added to the salt pan 1 is such that the depth of the high sodium brine is 40 to 60 cm.
[0035] The high-sodium brine penetrates into the voids of the high-sodium salt layer at the bottom of the pool. As the high-sodium brine continues to evaporate, the crystallized sodium chloride fills the voids of the salt layer at the bottom of the pool and hardens.
[0036] When the thickness of sodium chloride crystals at the bottom of the pool reaches 3-5 cm, use the water level pole to observe the water level mark. If there is no obvious change in the water level within 3-5 days, all high-sodium water will be discharged. High-sodium brine follows the chloride type Na + , K + Mg 2+ / C1 - —H2O quaternary water-salt system phase diagram theory or other water-salt system phase diagrams have a sodium chloride precipitation stage. The potassium chloride content in high-sodium water is less than 1.5%, the sodium chloride content is greater than 6%, and the magnesium chloride content is less than 18%. The brine-expelling component can only be the sodium chloride precipitation stage, and cannot be the sylvite or carnallite precipitation stage.
[0037] In the detection step S5, the primary sodium salt layer 2 and the secondary sodium salt layer 3 are used as the sodium salt pool plates of the salt field, and the permeability and strength are detected to obtain the permeability value and the strength value. If the permeability value is less than the permeability threshold, and the strength value is greater than the strength threshold, the sodium salt pool plate 4 is completed. Otherwise, the process returns to the secondary sodium salt layer forming step S4 until the permeability of the sodium salt pool plate 4 is less than the permeability threshold, and the strength value is greater than the strength threshold.
[0038] The permeability threshold is 0.3 mm / d, and the strength threshold is 50 kPa.
[0039] The present invention can greatly shorten the construction period of the salt pan sodium salt pool plate 4, and the construction period is reduced from more than 2 years required by the existing manufacturing method to within 3 months, reducing the impact on the production of the salt pan 1. It can also greatly improve the strength of the salt pan sodium salt pool plate 4 to prevent it from being damaged by the cutting head of the water mining ship, resulting in mud mixed in the slurry and reducing the grade of the potassium chloride product. It prevents the mud blown up by the strong wind from entering the lithium carbonate adsorption tower to cause the blockage of the adsorbent channel, avoids the decrease in the adsorption capacity of the adsorbent, thereby improving the yield and output of lithium, and prevents silicon dioxide from entering the desorption liquid when lithium ions are desorbed from the adsorption bed, avoiding the problem of excessive silicon in the lithium carbonate product, thereby improving the quality of lithium.
[0040] In addition, the leakage rate of the salt field 1 can be greatly reduced, the waste of mineral resources can be reduced, and the yield can be improved. Moreover, the construction is simple, and only the bottom of the pool and the high sodium salt need to be sprinkled with water, rolled, and the original brine crystals can be poured in to form a hardened surface. Finally, the large amount of high sodium salt ore produced by the sodium salt pool can be used to increase the value of the solid waste high sodium ore, which is suitable for large-scale industrial salt field production.
[0041] 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.
Claims
1. A method for manufacturing a salt field sodium salt pool plate, characterized in that: The following steps are included: A base layer forming step (S1), flattening and compacting the soil at the bottom of the salt pan (1) to form a salt pan base layer (12); a high sodium salt layer laying step (S2), laying a high sodium salt layer of a certain thickness on the salt pan base layer (12), and rolling it flat; a primary sodium salt layer forming step (S3), sprinkling an appropriate amount of fresh water into the high sodium salt layer, rolling and compacting it, and repeating the process multiple times to form a primary sodium salt layer (2); a secondary sodium salt layer forming step (S4), adding a certain amount of high sodium brine to the salt pan (1) and drying it for drying; when the sodium chloride crystals precipitated from the high sodium brine reach a certain thickness, the high sodium brine is discharged, and after drying, the crystals are flattened and compacted to form a secondary sodium salt layer (3) on the primary sodium salt layer (2); In a detection step (S5), the primary sodium salt layer (2) and the secondary sodium salt layer (3) are used as sodium salt pool plates of the salt field, and permeability and strength tests are performed on them to obtain permeability values and strength values. If the permeability value is less than a permeability threshold value, and the strength value is greater than a strength threshold value, the sodium salt pool plate (4) is manufactured. Otherwise, the process returns to the secondary sodium salt layer forming step (S4) until the permeability of the sodium salt pool plate (4) is less than the permeability threshold value, and the strength value is greater than the strength threshold value.
2. The method for manufacturing salt field sodium salt pool plates according to claim 1, characterized in that: In the base layer forming step (S1), when the soil at the bottom of the salt pan (1) is rolled and compacted, the moisture content of the soil is controlled within a range of 8% to 10%.
3. The method for manufacturing salt field sodium salt pool plates according to claim 2, characterized in that: In the base layer forming step (S1), the compaction degree of the soil is controlled to be ≥93%.
4. The method for manufacturing salt field sodium salt pool plates according to claim 3, characterized in that: In the high sodium salt layer laying step (S2), the thickness of the high sodium salt layer is set to 30-40 cm.
5. The method for manufacturing salt field sodium salt pool plates according to claim 4, characterized in that: In the step (S3) of forming the primary sodium salt layer, the thickness of the primary sodium salt layer (3) is ≥ 20 cm.
6. The method for manufacturing salt field sodium salt pool plates according to claim 5, characterized in that: In the secondary sodium salt layer forming step (S4), the high sodium brine is added to the salt pan (1) so that the depth of the high sodium brine in the salt pan (1) is 40-60 cm.
7. The method for manufacturing salt field sodium salt pool plates according to claim 6, characterized in that: In the secondary sodium salt layer forming step (S4), when the thickness of sodium chloride crystals precipitated from the high sodium brine reaches 3-5 cm, the high sodium brine in the salt pan is drained.
8. The method for manufacturing salt field sodium salt pool plates according to claim 7, characterized in that: In the detection step (S5), the permeability threshold is 0.3 mm / d and the strength threshold is 50 kPa.
9. The method for manufacturing a salt field sodium salt pool plate according to any one of claims 1 to 8, characterized in that: The salt used for laying the high sodium salt layer is granular salt naturally precipitated from a sodium salt pond, with a sodium chloride content of ≥83% and an adsorption mother liquor content of ≤15%.