Waste alkaline water recycling system in zirconium oxychloride production

Abstract

The utility model relates to a waste alkaline water recycling system in zirconium oxychloride production. The waste alkaline water recycling system comprises a filter, a transfer tank, a membrane separator and a storage tank which are connected in sequence, the filter is used for filtering solid impurities in the waste alkaline water; the transfer tank is used for introducing the filtered waste alkaline water into the membrane separator; the membrane separator is provided with a nanofiltration membrane and is used for separating the waste alkaline water to obtain a caustic soda solution and water glass; and the storage tank is used for storing the caustic soda solution and the water glass obtained by separation. According to the waste alkaline water recycling system disclosed by the utility model, the filter is arranged to filter and remove solid impurities in the waste alkaline water, and the membrane separator is arranged to separate the waste alkaline water into the caustic soda solution and the water glass, so that the waste alkaline water which can only be subjected to waste discharge treatment originally is converted into the caustic soda solution and the water glass which can be recycled; and the utilization rate of production resources is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of chemical production, in particular to a waste lye recycling system in zirconium oxychloride production. BACKGROUND

[0002] Zirconium oxychloride is an industrial product that can be widely used in textile, leather, rubber additives, metal surface treatment agent and the like. The existing zirconium oxychloride production process usually includes the steps of alkali fusion decomposition, water washing impurity removal, pickling impurity removal and the like, and a large amount of harmful waste liquid is generated in the process. In order to meet the environmental protection requirements, the waste liquid needs to be treated before being discharged. However, there are still many components with recycling value in the waste liquid, and the direct waste liquid treatment and discharge will waste these resources. SUMMARY

[0003] Therefore, the utility model aims at providing a waste lye recycling system in zirconium oxychloride production.

[0004] A waste lye recycling system in zirconium oxychloride production, comprising a filter, a transfer tank, a membrane separator and a storage tank connected in sequence; the filter is used for filtering solid impurities in the waste lye; the transfer tank is used for feeding the filtered waste lye into the membrane separator; the membrane separator is provided with a nanofiltration membrane and is used for separating the waste lye to obtain caustic soda solution and water glass; and the storage tank is used for storing the separated caustic soda solution and water glass.

[0005] The waste lye recycling system, by setting the filter to filter and remove the solid impurities in the waste lye, and setting the membrane separator to separate the waste lye into caustic soda solution and water glass, the waste lye that can only be discharged for disposal is converted into the caustic soda solution and water glass that can be recycled, and the utilization rate of production resources is effectively improved.

[0006] Further, the system further comprises a waste liquid tank, the waste liquid tank is connected with the filter, and is used for supplying the waste lye.

[0007] Further, the system further comprises a high-pressure pump, the high-pressure pump is installed at the liquid outlet of the waste liquid tank and the transfer tank respectively.

[0008] Further, the system further comprises an electric valve, the electric valve is installed on the liquid outlet pipeline of the high-pressure pump.

[0009] Further, the system further comprises a flow meter, the flow meter is installed on the liquid outlet pipeline of the electric valve.

[0010] Further, the system further comprises a plurality of liquid level meters, the liquid level meters are installed on the waste liquid tank, the transfer tank and the storage tank respectively.

[0011] Further, a PLC controller is also included, which is electrically connected with the high-pressure pump, the electric valve, the flow meter and the liquid level meter.

[0012] For better understanding and implementation, the utility model is explained in detail below in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a waste lye recycling system schematic diagram. DETAILED DESCRIPTION

[0014] Please refer to Figure 1 A waste lye recycling system in zirconium oxychloride production, comprising a filter 2, a transfer tank 3, a membrane separator 4 and a storage tank connected in sequence, waste lye is filtered, penetrated and other operations through the above devices in sequence, and finally the waste lye is separated into water glass and caustic soda solution, thereby realizing the recycling of waste lye.

[0015] Specifically, the filter 2 is connected with the waste lye produced in zirconium oxychloride production at one end, filters some solid impurities possibly contained in the waste lye, so that only liquid flows out of the filter 2 and enters the transfer tank 3 connected with the filter 2. The liquid inlet of the transfer tank 3 is connected with the filter 2, and the liquid outlet is connected with the membrane separator 4, which is used for temporarily storing the purified waste lye and providing the waste lye to the membrane separator 4 when needed. The membrane separator 4 is provided with a nanofiltration membrane, which has a selective permeation effect on different molecules. The waste lye produced in zirconium oxychloride production generally contains sodium silicate and sodium hydroxide, and the waste lye entering the membrane separator 4 is separated into sodium silicate solution (also known as water glass) and sodium hydroxide solution (also known as caustic soda solution) through the selective permeation effect of the nanofiltration membrane. The separated water glass can be sold as a product, and the caustic soda solution can be directly recycled into the production line. The storage tank includes a caustic soda solution transfer tank 51 and a water glass transfer tank 52, which are used for storing the caustic soda solution and water glass obtained from the membrane separator respectively.

[0016] In some embodiments, the waste lye recycling system further comprises a waste liquid tank 1 connected with the filter 2 for supplying waste lye. In actual production, waste lye may not be produced continuously and stably, and may not be produced for a period of time, or may be produced in large quantities for a period of time. Therefore, by setting the waste liquid tank 1 to temporarily store the waste lye, the waste lye is provided by the waste liquid tank 1 when needed, which is conducive to stably supplying waste lye to the system.

[0017] In some embodiments, the waste lye water recycling system further comprises a plurality of high-pressure pumps 6, respectively installed at the liquid outlets of the waste liquid tank 1 and the transfer tank 3. The liquid flowing out of the waste liquid tank 1 and the transfer tank 3 is pressurized by the high-pressure pumps 6, so that it is transmitted in the pipeline at a certain hydraulic pressure, ensuring smooth flow of the liquid. Preferably, high-pressure pumps 6 are also installed at the liquid outlets of the caustic soda liquid transfer tank 51 and the water glass transfer tank 52.

[0018] In some embodiments, the waste lye water recycling system further comprises a plurality of electric valves 7, respectively installed on the liquid outlet pipelines of the plurality of high-pressure pumps 6. The flow state of the pipeline is controlled by the electric valves 7, which can control whether the liquid flows in the pipeline and can also control the flow rate of the liquid in the pipeline, which is conducive to the stable supply of the liquid.

[0019] In some embodiments, the waste lye water recycling system further comprises a plurality of flow meters 8, respectively installed on the liquid outlet pipelines of the plurality of electric valves 7. The flow of liquid in the pipeline is monitored in real time by the flow meter, and feedback adjustment is made to the high-pressure pumps 6 and electric valves 7 based on the monitoring, so as to realize closed-loop control.

[0020] In some embodiments, the waste lye water recycling system further comprises a plurality of liquid level meters 9, respectively installed on the waste liquid tank 1, the transfer tank 3 and the storage tank, for monitoring the liquid level in the tank.

[0021] In some embodiments, the waste lye water recycling system further comprises a PLC controller 10, which is electrically connected to the high-pressure pumps 6, electric valves 7, flow meters 8 and liquid level meters 9, for receiving data and performing electrical control, which is conducive to centralized management and automation, and improves production efficiency.

[0022] In actual production, the waste lye water generated in the zirconium oxychloride production line is temporarily stored in the waste liquid tank 1, and then transported from the waste liquid tank 1 to the filter 2 for preliminary filtration to remove solid impurities therein. The filtered waste lye water is transported to the transfer tank 3 and then to the membrane separator 4 for separation to obtain caustic soda solution and water glass, which are respectively stored in the caustic soda liquid transfer tank 51 and the water glass transfer tank 52 for subsequent recycling or sale.

[0023] The waste lye water recycling system disclosed in the utility model filters and removes solid impurities in the waste lye water by setting a filter, and separates the waste lye water into caustic soda solution and water glass by setting a membrane separator, thereby converting the waste lye water that can only be disposed of into caustic soda solution and water glass that can be recycled, effectively improving the utilization rate of production resources.

[0024] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, several modifications and improvements can be made, and the utility model also intends to include these changes and modifications.

Claims

1. A system for recycling waste caustic water in zirconium oxychloride production, characterized by: The device comprises a filter, a transfer tank, a membrane separator and a storage tank connected in sequence; the filter is used for filtering solid impurities in waste lye water; the transfer tank is used for feeding filtered waste lye water into the membrane separator; the membrane separator is provided with a nanofiltration membrane and is used for separating waste lye water to obtain caustic soda solution and water glass; and the storage tank is used for storing the separated caustic soda solution and water glass.

2. The spent caustic recovery system of claim 1, wherein: The device further comprises a waste liquid tank connected with the filter and used for supplying waste lye water.

3. The spent caustic recovery system of claim 2, wherein: The device further comprises a high-pressure pump installed at a liquid outlet of the waste liquid tank and the transfer tank respectively.

4. The spent caustic recovery system of claim 3, wherein: The device further comprises an electric valve installed on a liquid outlet pipeline of the high-pressure pump.

5. The spent caustic recovery system of claim 4, wherein: The device further comprises a flow meter installed on a liquid outlet pipeline of the electric valve.

6. The spent caustic recovery system of claim 5, wherein: The device further comprises several liquid level meters installed on the waste liquid tank, the transfer tank and the storage tank respectively.

7. The spent caustic recovery system of claim 6, wherein: The device further comprises a PLC controller electrically connected with the high-pressure pump, the electric valve, the flow meter and the liquid level meters.

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