一种玻璃蚀刻废液的资源化处理系统

Abstract

本实用新型公开了一种玻璃蚀刻废液的资源化处理系统，包括连续脱硅、强化结晶、煅烧、深度除氟及蒸发结晶系统。连续脱硅系统通过脱硅反应釜等设备，将废液中硅元素转化为白炭黑产品；连续强化结晶系统利用强化结晶反应器等，通过引入镁离子，使废液中的氟离子与其反应生成氟化镁晶体，经抽滤得粗品氟化镁泥饼；连续煅烧系统对粗品氟化镁泥饼进一步处理，生成高品质氟化镁产品；连续深度除氟系统处理后的上清液进入蒸发结晶系统，单蒸釜对液体蒸发浓缩，结晶釜使硫酸铵结晶，离心分离机得到硫酸铵产品。该系统实现了硅、氟、氨氮及硫酸盐的高效回收和资源化利用，提高了资源利用率。

Claims

1. A system for the resource recovery of glass etching spent liquor, characterized by, include: A continuous desilication system (1) includes a desilication reactor (11), a settling tank (12), a first vacuum inverted filtration tank (13), and an airflow dryer (14) connected in sequence. The desilication reactor (11) is equipped with an online pH meter. The settling tank (12) and the first vacuum inverted filtration tank (13) are connected to a desilication waste liquid tank (16) through pipelines. The wet silica in the first vacuum inverted filtration tank (13) is dried by the airflow dryer (14) to form silica product. A continuous enhanced crystallization system (2) includes an enhanced crystallization reactor (21) and a second vacuum inverted filtration tank (22) connected in sequence. The desiliconization waste liquid tank (16) is connected to the enhanced crystallization reactor (21). The second vacuum inverted filtration tank (22) is used to generate crude magnesium fluoride sludge cake. The continuous calcination system (3) includes a rotary calciner (31) and a premixer (32). The crude magnesium fluoride sludge cake is transported to the rotary calciner (31) and the premixer (32) by a conveying device. The outlet of the rotary calciner (31) is connected to a return material speed regulating star feeder (33) by a conveying device and then sent to the premixer (32). The rotary calciner (31) is used to calcine high-purity magnesium fluoride products. A continuous deep defluorination system (4) includes a supernatant tank (41), a continuous impurity removal sedimentation tank (42), and a filter press (43) connected in sequence. The enhanced crystallization reactor (21) is connected to the supernatant tank (41), and the filter press (43) is connected to a clear liquid transfer tank (45). The supernatant tank (41) is equipped with an online fluoride ion meter. An evaporation crystallization system (5) is provided, comprising a single evaporator (51), a crystallization vessel (52), and a centrifuge (53). The single evaporator (51) is connected to the clear liquid transfer tank (45), and the centrifuge (53) is used to generate ammonium sulfate products.

2. A system for the resource recovery of glass etching spent liquor according to claim 1, wherein, The enhanced crystallization reactor (21) is divided into an inner cylindrical crystallization space (215) and an outer annular settling space (216) by a vertically arranged partition (217). The volume ratio of the crystallization space (215) to the settling space (216) is 1:2.5-1:3.

5.

3. A system for the resource recovery of glass etching spent liquor according to claim 2, wherein, The top of the enhanced crystallization reactor (21) includes a steam pipe (211) and a feed inlet (212). Both the steam pipe (211) and the feed inlet (212) are arranged axially along the crystallization space (215). A stirring rod (214) is provided at the center of the crystallization space (215). One end of the stirring rod (214) extends out of the top of the enhanced crystallization reactor (21) and is connected to a reducer (213). A stirring blade (2141) is driven and connected to the stirring rod (214).

4. The system for recycling glass etching waste solution of claim 3, wherein, The stirring blade (2141) comprises at least one layer, and the diameter of the stirring blade (2141) is 0.6-0.8 times the inner diameter of the crystallization space (215).

5. A system for the resource recovery of glass etching spent liquor according to any one of claims 1-4, characterized in that, The enhanced crystallization reactor (21) is provided with a sludge discharge valve (2191) at the bottom. The sludge discharge valve (2191) has a sludge discharge port (219). The sludge discharge valve (2191) is located at the lowest point of the bottom of the settling space (216). The sludge discharge port (219) is located on one side of the sludge discharge valve (2191).

6. A system for the resource recovery of glass etching spent liquor according to claim 5, wherein, The sludge discharge valve (2191) is a timed sludge discharge valve, and the sludge discharge time interval of the sludge discharge valve (2191) is 8h-12h.

7. A system for the resource recovery of glass etching spent liquor according to any one of claims 1 to 4, characterized in that, The enhanced crystallization reactor (21) has an annular trough-shaped supernatant overflow port (218) on its side wall, and the supernatant overflow port (218) is located on the top side wall of the settling space (216).

8. The system for recycling glass etching waste solution of claim 1, wherein, The continuous desilication system (1) also includes a washing water tank, a fluoride-containing waste liquid tank (15), a concentrated ammonia tank and a dilute ammonia tank connected to each other. The dilute ammonia tank is connected in parallel to the desilication reactor (11) via a pipeline to the fluoride-containing waste liquid tank (15). The washing water tank is connected to the first vacuum inverted filtration tank (13).

9. The system for recycling glass etching spent liquor of claim 1, wherein, The continuous enhanced crystallization system (2) also includes a magnesium sulfate mixing tank (23), and the washing water from the first vacuum turning filter tank (13) flows into the magnesium sulfate mixing tank (23) through a pipe. The magnesium sulfate mixing tank (23) is connected to the top feed port (212) of the enhanced crystallization reactor (21) through a pipe.

10. The system for recycling glass etching spent liquor of claim 9, wherein, The continuous deep defluorination system (4) also includes a dilute ammonia tank, a sulfuric acid tank, and an aluminum sulfate mixing tank (44). The dilute ammonia tank is connected to the continuous impurity removal sedimentation tank (42) through a pipeline. The sulfuric acid tank is connected to the clear liquid transfer tank (45) through a pipeline. The aluminum sulfate mixing tank (44) flows into the supernatant tank (41) through a pipeline.

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