Accurate automatic acid regulation control system

Abstract

The utility model aims to provide an accurate automatic acid adjusting control system which comprises a liquid adding assembly, the liquid adding assembly comprises a lithium precipitation clear liquid tank, a first ball valve, a pH meter, a first volumetric flowmeter and a first adjusting valve, and the liquid adding assembly can add lithium precipitation clear liquid and detect the pH value of the solution in real time; the acid adding assembly comprises a concentrated sulfuric acid head tank, a second ball valve, a second volumetric flow meter and a second adjusting valve, and concentrated sulfuric acid can be added according to a given target pH value.

Description

Technical Field

[0001] The utility model relates to the field of metal mineral processing, in particular to an accurate automatic acid adjustment control system. Background Art

[0002] It is necessary to neutralize and adjust the acid before the clear liquor of the primary lithium precipitation enters the MVR system, because a large amount of alkaline materials need to be added in the process of primary lithium extraction. Therefore, the pH value of the clear liquor of the primary lithium precipitation is about 12, which will not only affect the effect of lithium extraction, but also affect the precipitation of impurity salts and have a greater corrosion effect on the equipment. Therefore, the clear liquor of the primary lithium precipitation must be neutralized and adjusted before entering the MVR system, and the pH value of the clear liquor of the primary lithium precipitation is adjusted to 6-7. At present, there are two main ways to adjust the acid before entering the MVR system: the first way is to continuously measure the pH value of the neutralization and acid adjustment liquid manually, and then compare the measured pH value with the pH target range. If the measured pH value is greater than the target pH range, the sulfuric acid regulating valve is increased; if the measured pH value is less than the target pH range, the sulfuric acid regulating valve is decreased. This method not only makes the neutralization and acid adjustment personnel have many opportunities to contact with dangerous chemicals such as sulfuric acid, which has great safety risks, but also causes inaccurate measurements due to insufficient stirring of the neutralization and acid adjustment solution. The second method is to use a pH detector to replace the manual detection part, and compare the signal detected by the pH detector with the pH target range. If the measured pH value is greater than the target pH range, the sulfuric acid regulating valve is increased; if the measured pH value is less than the target pH range, the sulfuric acid regulating valve is decreased. Although this method greatly reduces the opportunities for neutralization and acid adjustment personnel to contact with dangerous chemicals such as sulfuric acid and increases personnel safety, inaccurate pH measurements due to insufficient stirring of the neutralization and acid adjustment solution still exist. Utility Model Content

[0003] In order to solve the above problems, the purpose of the utility model is to propose an accurate automatic acid adjustment control system, which innovates the device and process technology of neutralization and acid adjustment process before the primary lithium precipitation clear liquid enters the MVR system, thereby solving the problem of inaccurate pH measurement value caused by the neutralization and acid adjustment liquid not being stirred.

[0004] The utility model provides an accurate automatic acid adjustment control system, which comprises a neutralization tank, and further comprises: a liquid adding component arranged on one side of the neutralization tank, which can add lithium precipitation clear liquid and detect the pH value of the solution in real time; and an acid adding component arranged on the other side of the neutralization tank, which can add concentrated sulfuric acid according to a given target pH value.

[0005] Furthermore, the liquid adding component includes a lithium precipitate clear liquid tank, a first ball valve, a pH meter, a first volumetric flow meter and a first regulating valve. The lithium precipitate clear liquid tank is arranged on one side of the neutralization tank. A connecting pipe is provided between the lithium precipitate clear liquid tank and the neutralization tank. The connecting pipe is provided with a first ball valve, a pH meter, a first volumetric flow meter and a first regulating valve in sequence from one end adjacent to the lithium precipitate clear liquid tank. The pH meter and the first volumetric flow meter are connected to an external data analysis device, and the external data analysis device is connected to the first regulating valve through a wire.

[0006] Furthermore, the acid adding component includes a concentrated sulfuric acid high-level tank, a second ball valve, a second volume flowmeter and a second regulating valve. The concentrated sulfuric acid high-level tank is arranged on the other side of the neutralization tank. A connecting pipe is provided between the concentrated sulfuric acid high-level tank and the neutralization tank. The connecting pipe is provided with a second ball valve, a second volume flowmeter and a second regulating valve in sequence from one end adjacent to the concentrated sulfuric acid high-level tank. The second volume flowmeter is connected to an external data analysis device, and the external data analysis device is connected to the second regulating valve through a wire, so as to control the opening and closing of the second regulating valve and the flow rate.

[0007] Beneficial effects: 1. A pH meter and a first volume flow meter are provided on one side of the lithium precipitation clear liquid tank, and a second volume flow meter is provided on one side of the concentrated sulfuric acid high-level tank, which can detect the pH value of the lithium precipitation clear liquid before neutralization, completely solving the problem of inaccurate pH measurement due to the lack of stirring of the neutralization acid adjustment solution.

[0008] 2. It can detect the pH value of the neutralized solution in real time and compare it with the given value. According to the comparison deviation, the lithium precipitation clear solution and concentrated sulfuric acid can be selectively adjusted, which not only avoids the situation of incomplete acid adjustment, but also avoids the situation of excessive acid adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0010] Figure 2 It is a control principle diagram of the utility model.

[0011] Figure 3 The calculation principle of the utility model is Figure 1 .

[0012] Figure 4 The calculation principle of the utility model is Figure 2 .

[0013] Reference numerals: lithium precipitation clear liquid tank 11 ; first ball valve 12 ; pH meter 13 ; first volume flow meter 14 ; first regulating valve 15 ; concentrated sulfuric acid high level tank 21 ; second ball valve 22 ; second volume flow meter 23 ; second regulating valve 24 ; neutralization tank 31 . DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0015] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0016] Below, the precise automatic acid adjustment control system according to the embodiment of the utility model is described with reference to the accompanying drawings. Figure 1 - Figure 4 As shown, the precise automatic acid control system includes a neutralization tank 31, and the precise automatic acid control system also includes: a liquid adding component arranged on one side of the neutralization tank 31, which can add lithium precipitation clear solution and detect the pH value of the solution in real time; an acid adding component arranged on the other side of the neutralization tank 31, which can add concentrated sulfuric acid according to a given target pH value.

[0017] like Figure 1 and Figure 2 As shown, the precise automatic acid adjustment control system of the embodiment of the utility model includes a liquid adding component, which includes a lithium precipitate clear liquid tank 11, a first ball valve 12, a pH meter 13, a first volume flow meter 14 and a first regulating valve 15. The lithium precipitate clear liquid tank 11 is arranged on one side of the neutralization tank 31, and a connecting pipe is provided between the lithium precipitate clear liquid tank 11 and the neutralization tank 31. The connecting pipe is provided with a first ball valve 12, a pH meter 13, a first volume flow meter 14 and a first regulating valve 15 in sequence from one end adjacent to the lithium precipitate clear liquid tank 11. The pH meter 13 and the first volume flow meter 14 are connected to an external data analysis device, and the external data analysis device is connected to the first regulating valve 15 through a wire, so as to control the opening and closing and flow rate of the first regulating valve 15.

[0018] In a specific embodiment, when in use, the lithium precipitation clear liquid is discharged from the lithium precipitation clear liquid tank 11 , and the first ball valve 12 , the pH meter 13 , the first volume flow meter 14 and the first regulating valve 15 enter the neutralization tank 31 .

[0019] like Figure 1 and Figure 2As shown, the precise automatic acid adjustment control system of the embodiment of the utility model includes an acid adding component, which includes a concentrated sulfuric acid high-level tank 21, a second ball valve 22, a second volume flowmeter 23 and a second regulating valve 24. The concentrated sulfuric acid high-level tank 21 is arranged on the other side of the neutralization tank 31, and a connecting pipe is provided between the concentrated sulfuric acid high-level tank 21 and the neutralization tank 31. The connecting pipe is provided with a second ball valve 22, a second volume flowmeter 23 and a second regulating valve 24 in sequence from one end adjacent to the concentrated sulfuric acid high-level tank 21. The second volume flowmeter 23 is connected to an external data analysis device, and the external data analysis device is connected to the second regulating valve 24 through a wire, so as to control the opening and closing and flow of the second regulating valve 24.

[0020] In a specific embodiment, when in use, concentrated sulfuric acid (the pH value of the concentrated sulfuric acid is known) is discharged from the concentrated sulfuric acid high-level tank 21, enters the neutralization tank 31 through the second ball valve 22, the second volume flowmeter 23 and the second regulating valve 24, and reacts with the lithium precipitation clear solution to perform neutralization and acid adjustment.

[0021] During the process, the conversion formula between pH value and concentration (such as Figure 3 as shown) and the acid-base neutralization calculation formula (as shown Figure 4 The pH value after complete acid-base neutralization is obtained (as shown), and then the deviation is compared between the calculated pH value after complete neutralization and the target pH value. The deviation signal is then used to control the first regulating valve 15 and the second regulating valve 24 through the control system. If the measured pH value is greater than the target pH range, the second regulating valve 24 is increased or the first regulating valve 15 is decreased; if the measured pH value is less than the target pH range, the second regulating valve 24 is decreased or the first regulating valve 15 is increased.

[0022] Working principle: When in use, the lithium precipitation clear liquid is discharged from the lithium precipitation clear liquid tank 11, and enters the neutralization tank 31 through the first ball valve 12, the pH meter 13, the first volume flow meter 14 and the first regulating valve 15. Then, the concentrated sulfuric acid (the pH value of the concentrated sulfuric acid is known) is discharged from the concentrated sulfuric acid high-level tank 21, and enters the neutralization tank 31 through the second ball valve 22, the second volume flow meter 23 and the second regulating valve 24 to react with the lithium precipitation clear liquid, thereby performing neutralization and acid adjustment.

Claims

1. An accurate automatic acid adjustment control system, comprising a neutralization tank (31), characterized in that: The precise automatic acid adjustment control system further comprises: a liquid adding component arranged on one side of the neutralization tank (31), capable of adding lithium precipitation clear solution and detecting the pH value of the solution in real time; and an acid adding component arranged on the other side of the neutralization tank (31), capable of adding concentrated sulfuric acid according to a given target pH value.

2. The precise automatic acid adjustment control system according to claim 1, characterized in that: The liquid adding assembly comprises a lithium precipitate clear liquid tank (11), a first ball valve (12), a pH meter (13), a first volume flow meter (14) and a first regulating valve (15); the lithium precipitate clear liquid tank (11) is arranged on one side of the neutralization tank (31); a connecting pipe is arranged between the lithium precipitate clear liquid tank (11) and the neutralization tank (31); the connecting pipe is provided with the first ball valve (12), the pH meter (13), the first volume flow meter (14) and the first regulating valve (15) in sequence from one end adjacent to the lithium precipitate clear liquid tank (11); the pH meter (13) and the first volume flow meter (14) are connected to an external data analysis device, and the external data analysis device is connected to the first regulating valve (15) via a wire.

3. The precise automatic acid adjustment control system according to claim 1, characterized in that: The acid addition assembly comprises a concentrated sulfuric acid high-level tank (21), a second ball valve (22), a second volume flow meter (23) and a second regulating valve (24); the concentrated sulfuric acid high-level tank (21) is arranged on the other side of the neutralization tank (31); a connecting pipe is arranged between the concentrated sulfuric acid high-level tank (21) and the neutralization tank (31); the connecting pipe is provided with a second ball valve (22), a second volume flow meter (23) and a second regulating valve (24) in sequence from one end adjacent to the concentrated sulfuric acid high-level tank (21); the second volume flow meter (23) is connected to an external data analysis device, and the external data analysis device is connected to the second regulating valve (24) via a wire, so as to control the opening and closing of the second regulating valve (24) and the flow rate.

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