Electroplating bath liquid management, concentration and reuse process
阅读说明：本技术 电镀槽液管理浓缩回用工艺 (Electroplating bath liquid management, concentration and reuse process ) 是由 顾振 于 2020-07-20 设计创作，主要内容包括：本发明涉及一种电镀槽液管理浓缩回用工艺,包括以下步骤：步骤S1：电镀线上的镀槽和管理槽均和槽液循环泵连通,管理槽的槽液通过槽液循环泵打入镀槽；镀槽设置溢流口,镀槽内的槽液通过溢流口回到管理槽；镀槽和管理槽之间的槽液循环量≥3次/小时；步骤S2：压滤机通过隔膜泵将管理槽的槽液打入其中；压滤机将槽液中的大颗粒过滤,同时管理槽内的污泥外运；过滤完成的清液可通过隔膜泵回管理槽内；步骤S3：管理槽的槽液通入槽液浓缩回用设备,槽液浓缩回用设备通过负压蒸发槽液,槽液经过槽液浓缩回用设备提浓之后变为浓缩液,浓缩液通过槽液循环泵打回镀槽中。本发明节约大量的药剂成本和污水处理费用。(The invention relates to a concentration and recycling process for electroplating bath solution management, which comprises the following steps: step S1: the plating bath and the management bath on the plating line are both communicated with a bath circulating pump, and bath liquid in the management bath is pumped into the plating bath through the bath circulating pump; the plating tank is provided with an overflow port, and bath solution in the plating tank returns to the management tank through the overflow port; the circulation volume of the bath solution between the plating bath and the management bath is more than or equal to 3 times/hour; step S2: the filter press pumps the tank liquor in the management tank into the tank liquor through a diaphragm pump; the filter press filters large particles in the tank liquor and manages the outward transportation of the sludge in the tank; the filtered clear liquid can be pumped back to the management tank through a diaphragm; step S3: and the bath solution of the management tank is introduced into the bath solution concentration and recycling equipment, the bath solution concentration and recycling equipment evaporates the bath solution through negative pressure, the bath solution is changed into concentrated solution after being concentrated by the bath solution concentration and recycling equipment, and the concentrated solution is pumped back into the plating tank through the bath solution circulating pump. The invention saves a large amount of medicament cost and sewage treatment cost.)
1. A concentration and reuse process for electroplating bath solution management is characterized by comprising the following steps:
step S1: the plating tank (2) and the management tank (3) on the plating line are both communicated with the tank liquor circulating pump (1), and the tank liquor of the management tank (3) is pumped into the plating tank (2) through the tank liquor circulating pump (1); the plating tank (2) is provided with an overflow port, and the bath solution in the plating tank (2) returns to the management tank (3) through the overflow port; the circulation volume of the bath solution between the plating bath (2) and the management bath (3) is more than or equal to 3 times/hour;
step S2: the filter press (5) pumps the tank liquor in the management tank (3) into the filter press through the diaphragm pump (4); the filter press (5) filters the tank liquor, sludge and large-particle impurities in the management tank (3); the filtered clear liquid can return to the management tank (3) through the diaphragm pump (4);
step S3: and the bath solution of the management tank (3) is introduced into a bath solution concentrating and recycling device (6), the bath solution concentrating and recycling device (6) evaporates the bath solution through negative pressure, the bath solution is changed into concentrated solution after being concentrated by the bath solution concentrating and recycling device (6), and the concentrated solution is pumped back into the plating tank (2) through a bath solution circulating pump (1).
2. The electroplating bath management, concentration and recycling process according to claim 1, characterized in that: the filter press (5) is a dark flow filter press; the mesh number of the filter cloth of the filter press (5) is 100-300 meshes.
3. The electroplating bath management, concentration and recycling process according to claim 1, characterized in that: and an oxidant and active carbon are added into the management tank (3).
4. The electroplating bath management, concentration and recycling process according to claim 1, characterized in that: the tank liquor concentration and reuse equipment (6) controls the negative pressure to be more than or equal to-0.085 MPa and the evaporation temperature to be 55-65 ℃.
5. The electroplating bath management, concentration and recycling process according to claim 1, characterized in that: in step S3, the tank liquor concentration and reuse apparatus (6) includes a heater (61), a condensed water tank (62), an evaporator (63), a condenser (64), a feed pump (65), a forced circulation pump (66), a discharge pump (67), a negative pressure pump (68), and a vacuum pump (69); the bath solution is connected with the inlet of the feeding pump (65) through a first pipeline; the first inlet of the evaporator (63) and the outlet of the feed pump (65) are connected by a second conduit; a second inlet of the evaporator (63) and an outlet of the heater (61) are connected by a third pipe; raw steam is introduced into a first inlet of the heater (61); condensed water is led out from an outlet of the heater (61); the forced circulation pump (66) comprises a first passage opening and a second passage opening; the first channel port is communicated with the bottom of the heater (61); the second passage opening is communicated with the bottom of the evaporator (63); the discharge pump (67) comprises a horizontal suction inlet and a vertical discharge outlet; the horizontal suction inlet is communicated with the bottom of the evaporator (63); the vertical discharge port is communicated with the aqueduct; the condenser (64) and the evaporator (63) are communicated; cooling water is circulated in the condenser (64); a bottom water outlet of the condenser (64) is communicated with an inlet of the condensed water tank (62); a suction inlet of the negative pressure pump (68) is connected with an outlet of the condensed water tank (62); the discharge port of the negative pressure pump (68) discharges the rinsing water used condensed water after returning to the plating tank; a suction inlet of the vacuum pump (69) is communicated with the top of the condensed water tank (62); and the exhaust port of the vacuum pump (69) discharges tail gas.
6. The electroplating bath management, concentration and recycling process according to claim 5, characterized in that: in step S3, the bath solution is pumped into a heater (61) through a feed pump (65), the bath solution is heated through the steam of an evaporator (63), and the bath solution is subjected to steam-liquid separation in the evaporator (63) under the action of a forced circulation pump (66) and the negative pressure of a vacuum pump (69); the boiling steam passes through a condenser (64), and the condenser (64) converts the steam into liquid to enter a condensed water tank (62); the groove liquid is constantly concentrated, through groove liquid concentration in monitoring evaporimeter (63), when the groove liquid is concentrated to certain concentration, discharges the concentrate through discharge pump (67), directly mends back the groove liquid and plates the jar in, and the comdenstion water that condensate water pitcher (62) collected is beaten back in the multichannel rinsing groove through negative pressure pump (68).
Technical Field
The invention relates to the technical field of electroplating wastewater treatment, in particular to a process for managing, concentrating and recycling electroplating bath solution.
Background
FIG. 1 is a schematic view of an electroplating line. As shown in fig. 1, in the electroplating industry, a main process flow of a roll galvanizing production line is feeding → chemical degreasing → electrochemical degreasing → washing → acid washing → roll galvanizing → washing → hot washing → light extraction → washing → trivalent chromium passivation → washing → hot washing → sealing → spin-drying → inspection → finished product warehousing.
The main pollution production links and the pollutant analysis of electroplating are as follows:
as can be seen from the above, the plating bath plays an important role in determining the quality of the plated part during the production process. The document having application No. 201310502559.X entitled "an apparatus for recycling plating solution" discloses an apparatus for recycling plating solution, and it is known that the conventional plating tank management is not so good. The cost of the agent for the cylinder matching of the plating tank is very high, if the management of the plating tank is not good, the product is not well plated, the agent waste is large, the carrying amount of the plating tank is large backwards, the subsequent sewage treatment cost is high, and the plating solution of the plating tank is possibly scrapped under more serious conditions, so that greater loss is caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses a process for managing, concentrating and recycling electroplating bath solution.
The technical scheme adopted by the invention is as follows:
a concentration and reuse process for electroplating bath solution management comprises the following steps:
step S1: the plating bath and the management bath on the plating line are both communicated with a bath circulating pump, and bath liquid in the management bath is pumped into the plating bath through the bath circulating pump; the plating tank is provided with an overflow port, and bath solution in the plating tank returns to the management tank through the overflow port; the circulation volume of the bath solution between the plating bath and the management bath is more than or equal to 3 times/hour;
step S2: the filter press pumps the tank liquor in the management tank into the tank liquor through a diaphragm pump; filtering the tank liquor, sludge and large-particle impurities in the management tank by using a filter press; the filtered clear liquid can be pumped back to the management tank through a diaphragm;
step S3: and the bath solution of the management tank is introduced into the bath solution concentration and recycling equipment, the bath solution concentration and recycling equipment evaporates the bath solution through negative pressure, the bath solution is changed into concentrated solution after being concentrated by the bath solution concentration and recycling equipment, and the concentrated solution is pumped back into the plating tank through the bath solution circulating pump.
The method is further characterized in that: and adding an oxidant and activated carbon into the management tank.
The method is further characterized in that: the filter press is a blind flow type filter press; the filter cloth mesh number of the filter press is 100-300 meshes.
The method is further characterized in that: the negative pressure of the tank liquor concentration and reuse equipment is controlled to be more than or equal to-0.085 MPa, and the evaporation temperature is controlled to be 55-65 ℃.
The method is further characterized in that: in step S3, the tank liquor concentration and reuse apparatus includes a heater, a condensed water tank, an evaporator, a condenser, a feed pump, a forced circulation pump, a discharge pump, a negative pressure pump, and a vacuum pump; the tank liquor is connected with the inlet of the feed pump through a first pipeline; the first inlet of the evaporator and the outlet of the feed pump are connected through a second pipeline; the second inlet of the evaporator and the outlet of the heater are connected through a third pipeline; raw steam is introduced into a first inlet of the heater; condensed water is led out from an outlet of the heater; the forced circulation pump comprises a first passage port and a second passage port; the first channel port is communicated with the bottom of the heater; the second channel opening is communicated with the bottom of the evaporator; the discharge pump comprises a horizontal suction inlet and a vertical discharge outlet; the horizontal suction inlet is communicated with the bottom of the evaporator; the vertical discharge port is communicated with the aqueduct; the condenser is communicated with the evaporator; cooling water is circulated in the condenser; a water outlet at the bottom of the condenser is communicated with an inlet of the condensed water tank; a suction inlet of the negative pressure pump is connected with an outlet of the condensed water tank; the discharge port of the negative pressure pump discharges rinsing water used condensed water after returning to the plating tank; a suction inlet of the vacuum pump is communicated with the top of the condensed water tank; and the exhaust port of the vacuum pump exhausts tail gas.
The method is further characterized in that: in step S3, the bath solution is pumped into a heater through a feed pump, the bath solution is heated through the steam of an evaporator, and the bath solution is subjected to steam-liquid separation in the evaporator under the action of a forced circulation pump and the action of the negative pressure of a vacuum pump; boiling steam passes through a condenser, and the condenser converts the steam into liquid and then the liquid enters a condensate water tank; the groove liquid is constantly concentrated, through groove liquid concentration in the monitoring evaporimeter, when the groove liquid is concentrated to certain concentration, discharges the concentrate through the bleeder pump, directly mends back in the groove liquid plating jar, and the comdenstion water that the condensate water pitcher was collected is beaten back in multichannel rinsing groove through the negative pressure pump.
The invention has the following beneficial effects:
1. the invention realizes cleaning of bath solution, concentration of bath solution and recovery of medicament in the plating bath, and saves a large amount of medicament cost and sewage treatment cost for customers.
2. The invention can keep the bath solution clean, ensure the quality of plated products, save a large amount of medicament cost for customers and reduce the sewage treatment cost for customers by managing and controlling the bath solution.
3. The invention realizes zero discharge of wastewater and maximizes economic benefit on the basis of energy conservation and emission reduction.
Drawings
FIG. 1 is a schematic view of an electroplating line.
FIG. 2 is a schematic flow chart of the present invention.
FIG. 3 is a schematic view of a tank liquor concentration and reuse apparatus.
FIG. 4 is a parameter control table of examples 1, 2 and 3.
In the figure: 1. a tank liquor circulating pump; 2. plating bath; 3. a management slot; 4. a diaphragm pump; 5. a filter press; 6. tank liquor concentration and reuse equipment; 61. a heater; 62. a condensate tank; 63. an evaporator; 64. a condenser; 65. a feed pump; 66. a forced circulation pump; 67. a discharge pump; 68. a negative pressure pump; 69. a vacuum pump.
Detailed Description
The following describes a specific embodiment of the present embodiment with reference to the drawings.
FIG. 2 is a schematic flow chart of the present invention, and FIG. 3 is a schematic diagram of a tank liquor concentration and reuse apparatus. With reference to fig. 2 and 3, a process for managing, concentrating and recycling electroplating bath solution comprises the following steps:
step S1: the
Step S2: the filter press 5 pumps the bath solution in the
Step S3: the tank liquor of the
In step S3, the bath concentration recycling apparatus 6 includes a heater 61, a condensed water tank 62, an evaporator 63, a condenser 64, a feed pump 65, a forced circulation pump 66, a discharge pump 67, a negative pressure pump 68, and a vacuum pump 69. The bath solution is connected to the inlet of the feed pump 65 via a first conduit. The first inlet of the evaporator 63 and the outlet of the feed pump 65 are connected by a second pipe. A second inlet of the evaporator 63 and an outlet of the heater 61 are connected by a third pipe. The first inlet of the heater 61 is fed with raw steam. The outlet of the heater 61 is fed with condensed water. The forced circulation pump 66 includes a first passage port and a second passage port. The first passage port communicates with the bottom of the heater 61. The second passage communicates with the bottom of the evaporator 63. The discharge pump 67 includes a horizontal suction port and a vertical discharge port. The horizontal suction port communicates with the bottom of the evaporator 63. The vertical discharge port is communicated with the aqueduct. The condenser 64 communicates with the evaporator 63. The condenser 64 circulates cooling water. The bottom drain of the condenser 64 communicates with the inlet of the condensate tank 62. The suction inlet of the negative pressure pump 68 is connected to the outlet of the condensate tank 62. The drain port of the negative pressure pump 68 discharges the condensed water for rinsing water after returning to the plating tank. The suction port of the vacuum pump 69 communicates with the top of the condensate tank 62. The exhaust port of the vacuum pump 69 discharges the off gas.
In step S3, the bath solution is pumped into the heater 61 by the feed pump 65, heated by the steam of the evaporator 63, and subjected to vapor-liquid separation in the evaporator 63 by the action of the forced circulation pump 66 and the negative pressure of the vacuum pump 69. The boiling vapor passes through a condenser 64, and the condenser 64 converts the vapor to a liquid state into the condensate tank 62. The bath solution is constantly concentrated, through groove liquid concentration in monitoring evaporimeter 63, when the bath solution is concentrated to certain concentration, discharges the concentrate through discharge pump 67, directly mends back in the bath solution plating tank, and the comdenstion water that condensate water pitcher 62 collected is beaten back in the multichannel rinsing groove through negative pressure pump 68.