Quartz sand pickling equipment capable of detecting ion concentration and automatically supplementing liquid

Abstract

The quartz sand pickling equipment comprises a reaction kettle and a mother liquor tank, a feeding hole is formed in the top of the reaction kettle, an acid inlet and a second acid discharge hole are respectively formed in the bottom of the reaction kettle, and a sand discharge hole is formed in the side surface of the reaction kettle; a first liquid inlet and a second liquid inlet are formed in the top of the mother liquid tank, the first liquid inlet is connected with the second acid discharge port through a pipeline, the second liquid inlet is connected with an outlet of an acid pump through a pipeline, and an inlet of the acid pump is connected with an acid supplementing tank; a liquid outlet is formed in the bottom of the mother liquid tank and is connected with the acid inlet through a pipeline; an ion concentration detection device is fixedly mounted in the mother liquor tank and is connected with a concentrator through a signal line, the concentrator is connected with a signal converter, and the signal converter is connected with a computer; and valves are arranged at the second acid discharge port, the sand discharge port and the liquid outlet. The device not only realizes the recycling of the pickling waste liquid, but also improves the quality of quartz sand.

Description

Technical Field

[0001] The utility model belongs to the technical field of quartz sand purification equipment, in particular to quartz sand pickling equipment capable of detecting ion concentration and automatically replenishing liquid. Background Art

[0002] As an important non-metallic mineral raw material, quartz sand has greatly reduced the content of metal impurities such as iron and aluminum after acid washing and purification, and its purity has been significantly improved. Quartz sand of different purities has been widely used in solar photovoltaic, microelectronics, fiber optic communications and other industries.

[0003] As an effective method for removing metal impurities from quartz sand, pickling often involves various factors such as acid type, concentration, temperature, solid-liquid ratio, etc. These factors will affect the efficiency of quartz sand removal and the purity after purification. The devices used in the existing quartz sand pickling and purification process have two problems: First, during the acid leaching process, most devices are unable to recycle the mother liquor after one acid leaching for a second or multiple times, resulting in a large loss of acid solution, and the amount of acid replenishment cannot be accurately calculated, which often causes insufficient or excessive acid replenishment, resulting in low purity of quartz sand or large loss of acid solution, making it difficult for enterprises to control costs and product quality; Second, most devices are closed reaction vessels, in which quartz sand is statically soaked in room temperature inorganic acid solution for several days to more than ten days, or quartz sand is soaked in room temperature inorganic acid solution and stirred, resulting in low efficiency of quartz sand purification. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a quartz sand pickling equipment with ion concentration detection and automatic liquid replenishment, which not only realizes the recycling of pickling waste liquid, but also improves the quality of quartz sand.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A quartz sand pickling device for ion concentration detection and automatic liquid replenishment comprises a reactor and a mother liquid tank, wherein a feed port for adding raw sand material is provided on the top of the reactor, an acid inlet and a second acid discharge port are provided on the bottom of the reactor, and a sand discharge port is provided on the side of the reactor;

[0007] The mother liquid tank is provided with a first liquid inlet and a second liquid inlet at the top, the first liquid inlet is connected to the second acid discharge port through a pipeline, the second liquid inlet is connected to the outlet of the acid pump through a pipeline, and the inlet of the acid pump is connected to the acid replenishing tank; the mother liquid tank is provided with a liquid outlet at the bottom, and the liquid outlet is connected to the acid inlet through a pipeline;

[0008] An ion concentration detection device is fixedly installed inside the mother liquid tank, the ion concentration detection device is connected to the concentrator through a signal line, the concentrator is connected to the signal converter, and the signal converter is connected to the computer;

[0009] The second acid discharge port, the sand discharge port and the liquid outlet are all provided with valves.

[0010] Furthermore, a first acid discharge port is provided at the bottom of the reactor, the first acid discharge port is provided with a valve, the first acid discharge port is connected to a siphon tank through a pipeline, the siphon tank is connected to an inlet of a heat exchanger through a pipeline, the outlet of the heat exchanger is connected to an acid inlet through a pipeline, the heat medium inlet of the heat exchanger is connected to a steam outlet of a steam generator through a pipeline, the heat medium outlet of the heat exchanger is connected to a water inlet of a steam generator through a pipeline, and the gas interface of the steam generator is connected to an LNG gasification station through a pipeline;

[0011] The liquid outlet is connected to the inlet of the heat exchanger through a pipeline.

[0012] Furthermore, the ion concentration detection device comprises a glass electrode fixedly mounted on the inner wall of the mother liquid tank for detecting hydrogen ion concentration, a fluorine ion selective electrode for detecting fluorine ions, an iron ion selective electrode for detecting iron ions, and a calomel reference electrode for outputting a reference electrode potential;

[0013] The glass electrode, the fluorine ion selective electrode, the iron ion selective electrode and the calomel reference electrode are all connected to the concentrator through signal lines.

[0014] Furthermore, a temperature electrode for detecting temperature is fixedly installed inside the mother liquid tank, and the temperature electrode is connected to the concentrator via a signal line.

[0015] Further, the signal converter includes an amplifier and an analog-to-digital converter;

[0016] The concentrator is connected to the amplifier, the amplifier is connected to the analog-to-digital converter, and the analog-to-digital converter is connected to the computer.

[0017] Furthermore, a stirring device for stirring the raw sand material is provided inside the reactor.

[0018] Furthermore, a filtering device is provided inside the reactor, and the position of the filtering device is higher than the positions of the first acid discharge port and the second acid discharge port.

[0019] Furthermore, the siphon tank is connected to an acid exchange tank via a pipeline, and the acid exchange tank is connected to an acid storage tank.

[0020] Furthermore, the feed port is covered with a top cover.

[0021] Compared with the prior art, the utility model has the following technical effects:

[0022] The waste liquid generated by pickling is recovered through the mother liquid tank, which is called the primary mother liquid. The ion concentration detection device arranged inside the mother liquid tank obtains the concentration of ions in the primary mother liquid and transmits it to the computer. The computer calculates the amount of acid replenishment according to the ion concentration, and controls the acid pump to extract acid from the acid replenishment tank and replenish it into the mother liquid tank, thereby converting the primary acid into secondary acid that meets the pickling requirements. The secondary acid circulates into the reactor from the acid inlet and participates in the secondary pickling, which not only realizes the recycling of the waste liquid, but also can accurately calculate the amount of acid replenishment, thereby reducing the production cost and improving the quality of the quartz sand. In addition, the utility model has a simple structure and a short process flow, and is suitable for large-scale promotion and use.

[0023] The low-temperature acid liquid inside the reactor is extracted by a siphon tank and exchanged with the high-temperature water vapor in the heat exchanger, so that the temperature of the acid liquid is relatively high and relatively constant, and is not affected by climate change. The reaction rate of the acid liquid and iron ore is accelerated, not only shortening the reaction cycle to 12 to 14 hours, but also producing quartz sand with stable quality and an iron content of less than 100ppm.

[0024] By setting the temperature electrode inside the mother liquid tank, the real-time temperature of the waste liquid can be known, which is convenient for flexibly adjusting the temperature of the water vapor, achieving a good energy-saving effect. The appropriate temperature is also conducive to pickling, further improving the quality of quartz sand and shortening the reaction cycle.

[0025] By setting up a stirring device, the raw sand and the acid solution can be mixed evenly and fully contacted, further improving the quality of quartz sand and the efficiency of pickling.

[0026] In order to prevent quartz sand from clogging the first acid discharge port, the second acid discharge port and the pipeline, a filtering device is provided inside the reactor to minimize the amount of quartz sand included in the waste liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a process flow chart of pickling of the utility model;

[0028] Figure 2 It is a partial structural schematic diagram of the pickling equipment of the utility model;

[0029] In the figure: 1. mother liquid tank; 2. ion concentration detection device; 3. concentrator; 4. signal converter; 5. amplifier; 6. analog-to-digital converter; 7. computer; 8. acid pump; 9. acid replenishing tank; 10. temperature electrode; 11. glass electrode; 12. fluoride ion selective electrode; 13. iron ion selective electrode; 14. calomel reference electrode. DETAILED DESCRIPTION

[0030] The specific contents of the utility model are further explained in detail below in conjunction with the embodiments.

[0031] like Figure 1 and Figure 2 As shown, a quartz sand pickling device for ion concentration detection and automatic liquid replenishment includes a reactor and a mother liquid tank 1. A feed port for adding raw sand material is opened on the top of the reactor, and the feed port is covered with a top cover. An acid inlet, a first acid discharge port and a second acid discharge port are respectively opened at the bottom of the reactor. A sand discharge port is opened on the side of the reactor, and valves are provided on the first acid discharge port, the second acid discharge port and the sand discharge port;

[0032] The first acid discharge port is connected to the siphon tank through a pipeline, the siphon tank is connected to the inlet of the heat exchanger through a pipeline, the outlet of the heat exchanger is connected to the acid inlet through a pipeline, the heat medium inlet of the heat exchanger is connected to the steam outlet of the steam generator through a pipeline, the heat medium outlet of the heat exchanger is connected to the water inlet of the steam generator through a pipeline, the gas interface of the steam generator is connected to the LNG gasification station through a pipeline, the steam generator is heated by the LNG gasification station, the water inside the steam generator is heated, the water vapor enters the heat exchanger and exchanges heat with the acid liquid in the heat exchanger;

[0033] The siphon tank is connected to an acid exchange tank through a pipeline, and the acid exchange tank is connected to an acid storage tank. Different acids in the acid storage tank flow into the acid exchange tank in proportion to be mixed to obtain a desired mixed acid solution. The mixed acid solution exchanges heat with water vapor in a heat exchanger, and the heated acid solution enters the reactor from the acid inlet. The low-temperature acid solution generated by pickling is discharged from the first acid discharge port into the siphon tank, and then enters the heat exchanger from the siphon tank for cyclic heating, so that the acid solution in the reactor always maintains a set temperature, thereby improving the efficiency of pickling;

[0034] The acid inlet is set at the bottom of the reactor, and the acid liquid impregnates the raw sand material from bottom to top, which can completely react with the iron ore in the quartz sand, further improving the purity of the quartz sand;

[0035] The mother liquid tank 1 is provided with a first liquid inlet and a second liquid inlet on the top, the first liquid inlet is connected to the second acid discharge port through a pipeline, the liquid after the primary pickling flows out from the second acid discharge port and is recovered from the first liquid inlet to the mother liquid tank 1 to form a primary mother liquid; the second liquid inlet is connected to the outlet of the acid pump 8 through a pipeline, the inlet of the acid pump 8 is connected to the acid replenishing tank 9, the required acid is added to the liquid tank 1 through the acid replenishing tank 9, so that the primary mother liquid meets the pickling standard to form a secondary mother liquid; the mother liquid tank 1 is provided with a liquid outlet at the bottom, the liquid outlet is provided with a valve, and the liquid outlet is connected to the heat exchanger through a pipeline, the liquid meeting the pickling standard flows out from the liquid outlet and enters the heat exchanger, and after heat exchange with water vapor, circulates from the acid inlet into the reactor to participate in the secondary pickling;

[0036] An ion concentration detection device 2 and a temperature electrode 10 are fixedly installed inside the mother liquid tank 1. The ion concentration detection device 2 includes a glass electrode 11, a fluorine ion selective electrode 12, an iron ion selective electrode 13 and a calomel reference electrode 14 which are fixedly installed on the inner wall of the mother liquid tank 1. The temperature electrode 10 is used to detect the temperature of the liquid inside the mother liquid tank 1 and output the temperature electrode potential; the glass electrode 11 is used to detect the hydrogen ion concentration in the liquid inside the mother liquid tank 1 and output the glass electrode potential; the fluorine ion selective electrode 12 is used to detect the fluorine ions in the liquid inside the mother liquid tank 1 and output the fluorine ion selective electrode potential; the iron ion selective electrode 13 is used to detect the iron ions in the liquid inside the mother liquid tank 1 and output the iron ion selective electrode potential; the calomel reference electrode 14 outputs the reference electrode potential;

[0037] The temperature electrode 10, the glass electrode 11, the fluoride ion selective electrode 12, the iron ion selective electrode 13 and the calomel reference electrode 14 are all extended out of the mother liquid tank 1 and connected to the concentrator 3 through a signal line, and the concentrator 3 is connected to the signal converter 4;

[0038] The signal converter 4 includes an amplifier 5 and an analog-to-digital converter 6. The concentrator 3 is connected to the amplifier 5, the amplifier 5 is connected to the analog-to-digital converter 6, and the analog-to-digital converter 6 is connected to a computer 7. The computer 7 is installed with data processing software. The data processing software includes ion concentration detection software and acid supplement amount calculation software. The acid supplement amount can be calculated according to the concentration, temperature and acidity of the ions in the liquid inside the mother liquid tank 1, so as to control the acid pump 8 to extract acid from the acid supplement tank 9 and supplement it into the mother liquid tank 1, so that the liquid inside the mother liquid tank 1 meets the pickling standard and is recycled.

[0039] Preferably, the pipes are made of acid-resistant and heat-resistant materials, such as homopolymer polypropylene PPH or polytetrafluoroethylene PTFE.

[0040] Preferably, a filtering device is provided inside the reactor, and the filtering device is located higher than the first acid discharge port and the second acid discharge port, and is used to filter out sand and gravel in the primary mother liquor to prevent the sand and gravel from clogging the first acid discharge port and the second acid discharge port.

[0041] Preferably, a stirring device for stirring the raw sand material is provided inside the reactor, which can promote the raw sand material to be fully contacted and mixed with the acid solution.

[0042] This embodiment can shorten the pickling reaction period to 12 to 14 hours and is not affected by the climate code. The iron content in the obtained quartz sand product is less than 100 ppm and the quality is very stable.

[0043] The working principle of the utility model is as follows:

[0044] The raw sand material is injected into the feed port by an electric hoist, a belt conveyor or a feed sand pump. The acid in the acid storage tank flows into the acid mixing tank in proportion to mix to obtain the required mixed acid. The mixed acid exchanges heat with the water vapor in the heat exchanger. The heated acid enters the reactor from the acid inlet. The low-temperature acid generated by pickling is discharged from the first acid discharge port into the siphon tank, and then enters the heat exchanger from the siphon tank for circulating heating. The steam generator is heated by the LNG gasification station. The water inside the steam generator is heated and enters the heat exchanger to exchange heat with the low-temperature acid. The liquid generated by the first pickling flows out from the second acid discharge port and is recovered from the first liquid inlet to the mother liquid tank. 1, forming a primary mother liquor, the temperature electrode 10, the glass electrode 11, the fluorine ion selective electrode 12, the iron ion selective electrode 13 and the calomel reference electrode 14 respectively output corresponding potentials, which are converted into digital signals after passing through the amplifier 5 and the analog-to-digital converter 6 and transmitted to the computer 7. The computer 7 calculates the amount of acid replenishment according to the concentration, temperature and acidity of the ions in the liquid inside the mother liquor tank 1, thereby controlling the acid pump 8 to extract acid from the acid replenishment tank 9 and replenish the acid into the mother liquor tank 1, and the primary mother liquor is prepared into a secondary mother liquor that meets the pickling standard. The secondary mother liquor flows out from the liquid outlet and enters the heat exchanger. After heat exchange with water vapor, it circulates from the acid inlet into the reactor to participate in secondary pickling;

[0045] The pickled quartz sand is discharged from the sand outlet and is subsequently rinsed, screened and dewatered to form quartz sand that meets quality standards and is finally stored in inventory for future use.

Claims

1. A quartz sand pickling equipment with ion concentration detection and automatic liquid replenishment, characterized in that: It comprises a reactor and a mother liquid tank (1), wherein a feed port for adding raw sand material is provided on the top of the reactor, an acid inlet and a second acid outlet are provided on the bottom of the reactor, and a sand outlet is provided on the side of the reactor; The mother liquid tank (1) is provided with a first liquid inlet and a second liquid inlet at the top, the first liquid inlet is connected to the second acid discharge port via a pipeline, the second liquid inlet is connected to the outlet of an acid pump (8) via a pipeline, and the inlet of the acid pump (8) is connected to an acid replenishing tank (9); the mother liquid tank (1) is provided with a liquid outlet at the bottom, and the liquid outlet is connected to the acid inlet via a pipeline; An ion concentration detection device (2) is fixedly installed inside the mother liquid tank (1), the ion concentration detection device (2) is connected to a concentrator (3) via a signal line, the concentrator (3) is connected to a signal converter (4), and the signal converter (4) is connected to a computer (7); The second acid discharge port, the sand discharge port and the liquid outlet are all provided with valves.

2. The quartz sand pickling equipment for ion concentration detection and automatic liquid replenishment according to claim 1 is characterized in that: The bottom of the reactor is also provided with a first acid discharge port, the first acid discharge port is provided with a valve, the first acid discharge port is connected to a siphon tank through a pipeline, the siphon tank is connected to an inlet of a heat exchanger through a pipeline, the outlet of the heat exchanger is connected to an acid inlet through a pipeline, the heat medium inlet of the heat exchanger is connected to a steam outlet of a steam generator through a pipeline, the heat medium outlet of the heat exchanger is connected to a water inlet of a steam generator through a pipeline, and the gas interface of the steam generator is connected to an LNG gasification station through a pipeline; The liquid outlet is connected to the inlet of the heat exchanger through a pipeline.

3. The quartz sand pickling equipment for ion concentration detection and automatic liquid replenishment according to claim 1 or 2, characterized in that: The ion concentration detection device (2) comprises a glass electrode (11) fixedly mounted on the inner wall of the mother liquid tank (1) for detecting hydrogen ion concentration, a fluorine ion selective electrode (12) for detecting fluorine ions, an iron ion selective electrode (13) for detecting iron ions, and a calomel reference electrode (14) for outputting a reference electrode potential; The glass electrode (11), the fluoride ion selective electrode (12), the iron ion selective electrode (13) and the calomel reference electrode (14) are all connected to the concentrator (3) via signal lines.

4. The quartz sand pickling equipment for ion concentration detection and automatic liquid replenishment according to claim 1 or 2, characterized in that: A temperature electrode (10) for detecting temperature is also fixedly installed inside the mother liquid tank (1), and the temperature electrode (10) is connected to the concentrator (3) via a signal line.

5. The quartz sand pickling equipment for ion concentration detection and automatic liquid replenishment according to claim 4 is characterized in that: The signal converter (4) comprises an amplifier (5) and an analog-to-digital converter (6); The concentrator (3) is connected to an amplifier (5), the amplifier (5) is connected to an analog-to-digital converter (6), and the analog-to-digital converter (6) is connected to a computer (7).

6. The quartz sand pickling equipment for ion concentration detection and automatic liquid replenishment according to claim 1 or 2, characterized in that: A stirring device for stirring the raw sand material is arranged inside the reactor.

7. The quartz sand pickling equipment for ion concentration detection and automatic liquid replenishment according to claim 2 is characterized in that: A filtering device is arranged inside the reactor, and the position of the filtering device is higher than the positions of the first acid discharge port and the second acid discharge port.

8. The quartz sand pickling equipment for ion concentration detection and automatic liquid replenishment according to claim 2 is characterized in that: The siphon tank is connected to an acid exchange tank through a pipeline, and the acid exchange tank is connected to an acid storage tank.

9. The quartz sand pickling equipment for ion concentration detection and automatic liquid replenishment according to claim 1 or 2, characterized in that: The feed opening is covered with a top cover.

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