Comprehensive utilization system of precipitated silica filtering mother liquor
Patent Information
- Application Number
- CN202522102505.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-29
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-09-29
AI Technical Summary
[0006]针对现有技术中的缺陷，本实用新型提供沉淀二氧化硅过滤母液综合利用系统，用以解决传统技术中的沉淀二氧化硅生产过程中产生大量含硫酸钠的母液，且母液温度80℃以上，无法实现利用母液的余热以及回收硫酸钠产品的问题
[0023]将过滤母液通过助滤剂再次深度过滤，去除微量的不溶二氧化硅；
Smart Images
Figure CN224925773U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of silica production equipment, specifically to a comprehensive utilization system for mother liquor from silica precipitation filtration. Background Technology
[0002] The production process of precipitated silica generates a large amount of filtrate mother liquor. Direct discharge of this mother liquor not only wastes resources but also causes environmental pollution. Comprehensive utilization of the filtrate mother liquor can achieve resource recovery and energy conservation and emission reduction. Common technologies include water recycling, extraction of useful substances, and preparation of other products. Through multi-effect evaporation, the filtrate mother liquor for precipitated silica is evaporated and concentrated, causing the water to gradually evaporate and the salt concentration in the mother liquor to continuously increase until it reaches a supersaturated state, thus crystallizing out.
[0003] The shortcomings of existing technology have gradually become apparent with use, mainly in the following aspects:
[0004] The production process of precipitated silica generates a large amount of mother liquor containing 4.0% sodium sulfate at temperatures above 80°C. Currently, domestic and foreign counterparts generally adopt a treatment process of collection, sedimentation to remove suspended solids, pH adjustment, and dilution to meet discharge standards. This process wastes the residual heat of the mother liquor and sodium sulfate products, which is neither energy-saving nor environmentally friendly.
[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content
[0006] To address the shortcomings of existing technologies, this utility model provides a comprehensive utilization system for mother liquor from precipitated silica filtration, which solves the problem that traditional technologies generate a large amount of mother liquor containing sodium sulfate during the production of precipitated silica, and the mother liquor temperature is above 80°C, making it impossible to utilize the waste heat of the mother liquor and recover sodium sulfate products.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A comprehensive utilization system for mother liquor from silica filtration includes a silica filter and a mother liquor filter connected in sequence. A filter aid addition pipeline is connected to the mother liquor filter. A first-effect evaporation unit and a second-effect evaporation unit are connected in sequence to the outlet section of the mother liquor filter. A thickener is connected to the outlet of the second-effect evaporation unit. A centrifuge is connected to the outlet of the thickener. A sodium sulfate collection pipeline is connected to the material outlet of the centrifuge. The liquid outlet pipeline of the centrifuge is connected to the second-effect evaporation unit.
[0009] As an optimized solution, the steam discharge pipeline of the double-effect evaporation unit is connected to an evaporative condenser, and the evaporative condenser is connected to a condensate recovery pipeline and a vacuum pump.
[0010] As an optimized solution, the single-effect evaporation unit includes a single-effect heat exchanger and a single-effect separator, and the single-effect heat exchanger and the single-effect separator are connected to a single-effect circulation pipeline via a single-effect circulation pump.
[0011] As an optimized solution, the double-effect evaporation unit includes a double-effect heat exchanger and a double-effect separator, and the double-effect heat exchanger and the double-effect separator are connected by a double-effect circulation pipeline through a double-effect circulation pump.
[0012] As an optimized solution, the steam discharge pipe of the first-effect separator is connected to the second-effect heat exchanger.
[0013] As an optimized solution, the first-effect separator is connected to the second-effect separator through the first-effect concentrated mother liquor discharge pipeline, and the first-effect discharge pump is connected to the first-effect concentrated mother liquor discharge pipeline.
[0014] As an optimized solution, the double-effect separator is connected to the thickener via a double-effect concentrated mother liquor discharge pipeline, and a double-effect discharge pump is connected to the double-effect concentrated mother liquor discharge pipeline.
[0015] As an optimized solution, the single-effect heat exchanger is equipped with a low-temperature mother liquor discharge pipeline connected to the mother liquor tank.
[0016] As an optimized solution, the mother liquor tank is equipped with a circulating spray pipeline connected to the evaporative condenser via a mother liquor circulation pump.
[0017] As an optimized solution, the circulating spray pipeline is also equipped with a mother liquor replenishment pipeline connected to the first-effect separator.
[0018] As an optimized solution, a mother liquor collection tank and a mother liquor refining filtration pump are connected sequentially between the silica filter and the mother liquor filter.
[0019] As an optimized solution, a mother liquor refining tank and a mother liquor heat exchange pump are connected sequentially between the mother liquor filter and the first-effect evaporation unit.
[0020] As an optimized solution, the liquid outlet line of the centrifuge is connected to the double-effect separator.
[0021] As an optimized solution, the double-effect heat exchanger is connected to a condensate recovery pipeline.
[0022] Compared with the prior art, the beneficial effects of this utility model are:
[0023] The mother liquor was filtered again with a filter aid to remove trace amounts of insoluble silica.
[0024] Using its own residual heat above 80°C as a heat source, the sodium sulfate is evaporated through a multi-effect evaporator and an evaporative condenser until sodium sulfate crystals appear. Then, a centrifuge is used to separate the solid and liquid to obtain crystalline sodium sulfate product.
[0025] By utilizing the residual heat of the mother liquor combined with multi-effect evaporation technology, the amount of mother liquor evaporated from the precipitated silica production line can be increased. Attached Figure Description
[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0027] Figure 1 This is a schematic diagram of the structure of this utility model.
[0028] In the diagram: 1-Silica filter; 2-Mother liquor filter; 3-Filter aid addition pipeline; 4-Mother liquor collection tank; 5-Mother liquor refining filter pump; 6-Mother liquor refining tank; 7-Mother liquor heat exchange pump; 8-First-effect heat exchanger; 9-First-effect separator; 10-First-effect circulation pump; 11-First-effect discharge pump; 12-Second-effect heat exchanger; 13-Second-effect separator; 14-Second-effect circulation pump; 15-Second-effect discharge pump; 16-Thickener; 17-Centrifuge; 18-Sodium sulfate collection pipeline; 19-Liquid outlet pipeline; 20-Mother liquor tank; 21-Evaporative condenser; 22-Vacuum pump; 23-Condensate recovery pipeline; 24-Mother liquor circulation pump; 25-Circulating spray pipeline; 26-Mother liquor replenishment pipeline; 27-Low-temperature mother liquor discharge pipeline; 28-Condensate discharge pipeline. Detailed Implementation
[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0030] like Figure 1 As shown, the comprehensive utilization system for mother liquor from silica filtration includes a silica filter 1 and a mother liquor filter 2 connected in sequence. A filter aid addition pipeline 3 is connected to the mother liquor filter 2. A first-effect evaporation unit and a second-effect evaporation unit are connected in sequence to the outlet section of the mother liquor filter 2. A thickener 16 is connected to the outlet of the second-effect evaporation unit. A centrifuge 17 is connected to the outlet of the thickener 16. A sodium sulfate collection pipeline 18 is connected to the material outlet of the centrifuge 17. A liquid outlet pipeline 19 of the centrifuge 17 is connected to the second-effect evaporation unit.
[0031] The steam discharge pipe of the double-effect evaporator unit is connected to an evaporative condenser 21, and the evaporative condenser 21 is connected to a condensate recovery pipe 23 and a vacuum pump 22.
[0032] The single-effect evaporation unit includes a single-effect heat exchanger 8 and a single-effect separator 9. The single-effect heat exchanger 8 and the single-effect separator 9 are connected to a single-effect circulation pipeline via a single-effect circulation pump 10.
[0033] The double-effect evaporation unit includes a double-effect heat exchanger 12 and a double-effect separator 13. The double-effect heat exchanger 12 and the double-effect separator 13 are connected by a double-effect circulation pipeline through a double-effect circulation pump 14.
[0034] The steam discharge pipe of the first-effect separator 9 is connected to the second-effect heat exchanger 12.
[0035] The first-effect separator 9 is connected to the second-effect separator 13 through the first-effect concentrated mother liquor discharge pipeline, and the first-effect discharge pump 11 is connected to the first-effect concentrated mother liquor discharge pipeline.
[0036] The double-effect separator 13 is connected to the thickener 16 via the double-effect concentrated mother liquor discharge pipeline, and the double-effect discharge pump 15 is connected to the double-effect concentrated mother liquor discharge pipeline.
[0037] The single-effect heat exchanger 8 is equipped with a low-temperature mother liquor discharge pipeline 27 connected to the mother liquor tank 20.
[0038] The mother liquor tank 20 is equipped with a circulating spray pipeline 25 connected to the evaporative condenser 21 via the mother liquor circulation pump 24.
[0039] The circulating spray pipeline 25 is also equipped with a mother liquor replenishment pipeline 26 connected to the first-effect separator 9.
[0040] A mother liquor collection tank 4 and a mother liquor refining filtration pump 5 are connected sequentially between the silica filter 1 and the mother liquor filter 2.
[0041] A mother liquor refining tank 6 and a mother liquor heat exchange pump 7 are connected sequentially between the mother liquor filter 2 and the first-effect evaporation unit.
[0042] The liquid outlet line 19 of centrifuge 17 is connected to the double-effect separator 13.
[0043] The double-effect heat exchanger 12 is connected to a condensate drain line 28.
[0044] The mother liquor was filtered again with a filter aid to remove trace amounts of insoluble silica.
[0045] Using its own residual heat above 80°C as a heat source, the sodium sulfate is circulated and heated through a multi-effect evaporator and an evaporative condenser 21 until sodium sulfate crystals appear. Then, a centrifuge 17 is used to separate the solid and liquid to obtain crystalline sodium sulfate product.
[0046] By utilizing the residual heat of the mother liquor combined with multi-effect evaporation technology, the amount of mother liquor evaporated from the precipitated silica production line can be increased.
[0047] The specific structures of the various devices involved in this system are all well-known in the field and are not innovative aspects of this solution, so they will not be elaborated upon here.
[0048] The working principle of this device is as follows:
[0049] The silica slurry first enters the silica filter 1. Inside the filter, the solid silica in the slurry is retained, while the separated raw mother liquor flows into the mother liquor collection tank 4. The purpose of this step is to achieve preliminary separation of silica and mother liquor, obtaining a relatively pure mother liquor for subsequent processing.
[0050] The raw mother liquor flowing out of the mother liquor collection tank 4 is transported to the mother liquor filter 2 by the mother liquor refining filter pump 5. At the same time, a filter aid is added to the mother liquor filter 2. The filter aid can form a loose filter layer in the mother liquor, improve the filtration efficiency and accuracy, remove impurities in the mother liquor, and refine the mother liquor. The refined mother liquor enters the mother liquor refining tank 6.
[0051] The mother liquor is transported from the mother liquor refining tank 6 to the first-effect heat exchanger 8 via the mother liquor heat exchange pump 7. In the first-effect heat exchanger 8, the mother liquor exchanges heat with steam, causing its temperature to rise. The heated mother liquor then enters the first-effect separator 9, where it is heated and evaporated. The generated steam can be transported to the second-effect heat exchanger 12 for heating the second-effect evaporation, achieving cascade utilization of heat. The mother liquor, after preliminary evaporation and concentration in the first-effect separator 9, is partly transported by the first-effect discharge pump 11, and the other part circulates between the first-effect heat exchanger 8 and the first-effect separator 9 under the action of the first-effect circulation pump 10. This ensures uniform concentration and temperature of the mother liquor within the first-effect evaporation unit, improving evaporation efficiency.
[0052] Steam from the first effect enters the second effect heat exchanger 12 to heat the mother liquor from the mother liquor refining tank 6 or the first effect. The heated mother liquor then enters the second effect separator 13, where it is further evaporated and concentrated. A portion of the concentrated mother liquor is pumped to subsequent processes via the second effect discharge pump 15, while the other portion circulates between the second effect heat exchanger 12 and the second effect separator 13 under the action of the second effect circulation pump 14, similar to the first effect circulation, ensuring the stable operation of the second effect evaporation unit. Simultaneously, the condensate produced by the second effect heat exchanger 12 can be recycled.
[0053] The mother liquor, concentrated by the double-effect evaporation unit, enters the thickener 16. Inside the thickener 16, the concentration of solute (mainly sodium sulfate) in the mother liquor is further increased, preparing for subsequent crystallization and bringing the mother liquor to a supersaturated state, which is conducive to crystal formation.
[0054] The thickened mother liquor enters centrifuge 17, where the crystals (sodium sulfate crystals) are separated from the filtrate under the high-speed rotation of centrifuge 17. The separated crystals are the sodium sulfate product, which can be collected and packaged; the filtrate is returned to the double-effect separator 13 to continue participating in the double-effect evaporation and concentration process, improving the utilization rate of raw materials.
[0055] The steam generated during the first and second effect evaporation processes enters the evaporative condenser 21. The evaporative condenser 21, through the action of circulating spray water and the vacuum pump 22, condenses the steam into water. The condensate can be recycled and used in other stages of the production process, reducing water waste; simultaneously, the vacuum pump 22 maintains the vacuum environment of the evaporation system, lowering the boiling point of the solution and improving evaporation efficiency.
[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.
Claims
1. A comprehensive utilization system for mother liquor from precipitated silica filtration, characterized in that: The system includes a silica filter (1) and a mother liquor filter (2) connected in sequence. The mother liquor filter (2) is connected to a filter aid addition line (3). The outlet section of the mother liquor filter (2) is connected to a first-effect evaporation unit and a second-effect evaporation unit in sequence. The outlet of the second-effect evaporation unit is connected to a thickener (16). The outlet end of the thickener (16) is connected to a centrifuge (17). The material outlet of the centrifuge (17) is connected to a sodium sulfate collection line (18). The liquid outlet line (19) of the centrifuge (17) is connected to the second-effect evaporation unit.
2. The comprehensive utilization system for mother liquor from precipitated silica filtration according to claim 1, characterized in that: The steam discharge pipeline of the double-effect evaporation unit is connected to an evaporative condenser (21), and the evaporative condenser (21) is connected to a condensate recovery pipeline (23) and a vacuum pump (22).
3. The comprehensive utilization system for mother liquor from precipitated silica filtration according to claim 2, characterized in that: The single-effect evaporation unit includes a single-effect heat exchanger (8) and a single-effect separator (9), and the single-effect heat exchanger (8) and the single-effect separator (9) are connected to a single-effect circulation pipeline via a single-effect circulation pump (10).
4. The comprehensive utilization system for mother liquor from precipitated silica filtration according to claim 3, characterized in that: The double-effect evaporation unit includes a double-effect heat exchanger (12) and a double-effect separator (13), and the double-effect heat exchanger (12) and the double-effect separator (13) are connected by a double-effect circulation pipeline through a double-effect circulation pump (14).
5. The comprehensive utilization system for mother liquor from precipitated silica filtration according to claim 4, characterized in that: The steam discharge pipe of the first-effect separator (9) is connected to the second-effect heat exchanger (12).
6. The comprehensive utilization system for mother liquor from precipitated silica filtration according to claim 5, characterized in that: The first-effect separator (9) is connected to the second-effect separator (13) through the first-effect concentrated mother liquor discharge pipeline, and the first-effect concentrated mother liquor discharge pipeline is connected to the first-effect discharge pump (11).
7. The comprehensive utilization system for mother liquor from precipitated silica filtration according to claim 6, characterized in that: The double-effect separator (13) is connected to the thickener (16) through the double-effect concentrated mother liquor discharge pipeline, and the double-effect discharge pump (15) is connected to the double-effect concentrated mother liquor discharge pipeline.
8. The comprehensive utilization system for mother liquor from precipitated silica filtration according to claim 7, characterized in that: The first-effect heat exchanger (8) is provided with a low-temperature mother liquor discharge pipeline (27) connected to the mother liquor tank (20). The mother liquor tank (20) is provided with a circulating spray pipeline (25) connected to the evaporative condenser (21) via a mother liquor circulation pump (24). The circulating spray pipeline (25) is also provided with a mother liquor replenishment pipeline (26) connected to the first-effect separator (9).
9. The comprehensive utilization system for mother liquor from precipitated silica filtration according to claim 8, characterized in that: The silica filter (1) and the mother liquor filter (2) are connected in sequence by a mother liquor collection tank (4) and a mother liquor refining filter pump (5).
10. The comprehensive utilization system for mother liquor from precipitated silica filtration according to claim 9, characterized in that: The mother liquor filter (2) and the first-effect evaporation unit are connected in sequence to a mother liquor refining tank (6) and a mother liquor heat exchange pump (7).