High-purity quartz sand pickling system

Abstract

The utility model relates to a high-purity quartz sand pickling system, which comprises an acid liquor heating tank, a first precipitation tank, a reaction kettle and a second precipitation tank, the reaction kettle is circularly connected with the acid liquor heating tank through the first precipitation tank in sequence, and the reaction kettle is circularly connected with the second precipitation tank. The acid pickling device has the advantages that the acid pickling process is continuous and efficient, the sand discharging is smooth, the product quality is improved, the labor intensity in production is reduced, and the acid pickling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of high-purity quartz sand pickling, in particular to a high-purity quartz sand pickling system. Background Art

[0002] The existing quartz sand pickling system is mainly composed of a reactor, a reaction tank, a transfer sedimentation tank, an acid mixing tank and a heating tank. Its structure has the following disadvantages:

[0003] 1. The acid discharge from multiple reactors enters a transfer sedimentation tank at the same time, resulting in the inability to adjust the acid concentration of each reactor separately, and the inability to heat or keep warm separately according to the actual temperature of each tank.

[0004] 2. The reactor adopts the upward acid feeding mode, which is more practical for quartz sand with round particles (stone plate crushed sand). If the quartz sand has flat particles, during the acid immersion circulation process, especially after 6 or 7 hours, the permeability between the sand particles will be greatly weakened, which seriously hinders the normal circulation of the acid, slows down the reaction replacement process and the subsequent acid discharge and rinsing process of the sand in the reactor after the acid washing is completed. Utility Model Content

[0005] In order to solve the above-mentioned technical problems existing in the background technology, the utility model provides a high-purity quartz sand pickling system, which has the advantages of continuity and high efficiency of the pickling process and smooth sand discharge, thereby improving product quality, reducing labor intensity in production, and improving pickling efficiency.

[0006] The technical solution of the utility model is: the utility model is a high-purity quartz sand pickling system, which is special in that: the high-purity quartz sand pickling system comprises an acid heating tank, a first precipitation tank, a reactor and a second precipitation tank, the reactor is connected in a loop through the first precipitation tank and the acid heating tank in turn, and the reactor is connected in a loop with the second precipitation tank.

[0007] Furthermore, a first overflow port and a second overflow port are respectively provided on the left and right sides of the upper part of the reactor, a first acid inlet and a second acid inlet are provided at the bottom of the reactor, the reactor is circulatedly connected through the first overflow port, the first precipitation tank, the acid heating tank and the first acid inlet, and the reactor is circulatedly connected through the second overflow port, the second precipitation tank and the second acid inlet.

[0008] Furthermore, the high-purity quartz sand pickling system also includes an acid liquid precipitation tank and an acid exchange tank, and the reaction kettle is connected to the acid liquid heating tank through the acid liquid precipitation tank and the acid exchange tank in sequence.

[0009] Furthermore, an acid outlet is provided at the bottom of the reactor, and the reactor is connected to the acid liquid precipitation tank via the acid outlet.

[0010] Furthermore, a third acid inlet and a fourth acid inlet are respectively arranged on the left and right sides of the upper part of the acid liquid heating tank, the first precipitation tank is connected to the acid liquid heating tank through the fourth acid inlet, and the acid addition tank is connected to the acid liquid heating tank through the third acid inlet.

[0011] Furthermore, control valves are provided at the first overflow port, the second overflow port, the first acid inlet, the acid outlet, the second acid inlet, the third acid inlet and the fourth acid inlet.

[0012] Furthermore, the first acid inlet and the second acid inlet are respectively arranged on the left and right sides of the bottom of the reactor, and the acid outlet is arranged in the middle of the bottom of the reactor.

[0013] The utility model provides a high-purity quartz sand pickling system, which adopts the scheme of acid introduction at the bottom of the reactor and overflow at the top. The advantages are: the sand particles in the reactor are always in a loose state, the acid liquid has good permeability, the circulation frequency is high, and because the acid is introduced from the bottom, the acid liquid is guaranteed to rise and overflow evenly in the cross section of the reactor, and the pickling degree of the sand particles in each part of the reactor is consistent. The problem that the reaction products formed by the acid liquid and the various oxides in the sand during the reaction process, especially fluoroaluminates and fluorosilicates, calcium oxalate, etc., form a compaction in the sand, which hinders the acid liquid circulation, thereby slowing down the pickling process, especially causing greater difficulties for the subsequent sand discharge. Therefore, this process is aimed at Al in the original sand. 2 O 3 Hard sand with a content of >0.4%, CaO>0.15%, and alkali metal oxide greater than 0.1% is more practical. During the pickling process, the temperature of the reactor is independently controlled, and the temperature range is set to 75-80°C. After 7-8 hours of heat preservation circulation, when the temperature in the reactor drops to 75°C, it switches to the cycle heating stage. After the temperature reaches 80°C in two hours, it switches to the heat preservation circulation, which repeats over and over again, ensuring that the pickling temperature of the reactor can be independently controlled and improving the pickling efficiency. Therefore, the utility model has the following advantages:

[0014] 1) The utility model adopts a two-way circulation system to ensure that the acid solution in each unit reactor is always in a circulating and constant temperature state, which improves the pickling efficiency and saves 7 hours compared with the ordinary process pickling, laying a solid foundation for energy saving and consumption reduction.

[0015] 2) The utility model adopts the bottom acid feeding method, which ensures the uniformity of the pickling quality of the sand in each place in the reactor and improves the overall quality of the pickled sand. Since the problem of sand agglomeration during the pickling process is solved, the continuity and efficiency of the pickling process and the smoothness of sand discharge are ensured, the product quality is improved and the labor intensity in production is reduced.

[0016] 3) This process has a wide range of applications, especially for raw sand with high feldspar content.

[0017] 4) The temperature of a single reactor rises quickly, and the acid is always in a circulating state during the pickling process. Each reactor is heated and insulated independently. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a structural schematic diagram of a reaction kettle of the utility model.

[0020] The following are the descriptions of the reference numerals:

[0021] 1. Acid liquid heating tank; 2. First precipitation tank; 3. Reactor; 4. Second precipitation tank; 5. Acid mixing tank; 6. Acid liquid precipitation tank;

[0022] 3.1, first overflow port; 3.2, second overflow port; 3.3, first acid inlet port; 3.4, acid outlet port; 3.5, second acid inlet port; DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] See also Figure 1 The structure of the specific embodiment of the utility model includes a reaction kettle 3 and a two-way circulation system; wherein:

[0025] 1) The reaction kettle 3, the first precipitation tank 2 and the acid solution heating tank 1 form a first closed circulation system.

[0026] 2) The reaction kettle 3 and the second sedimentation tank 4 form a second closed circulation system.

[0027] The reaction kettle 3 is connected to the acid solution heating tank 1 through the acid addition tank 5 and the acid solution precipitation tank 6 in sequence.

[0028] See also Figure 2 The structure of the specific embodiment of the reactor of the utility model includes a first overflow port 3.1 and a second overflow port 3.2 respectively arranged on the left and right sides of the upper part of the reactor 3, and a first acid inlet 3.3, an acid outlet 3.4 and a second acid inlet 3.5 are arranged at the bottom of the reactor 3, wherein the first acid inlet 3.3 and the second acid inlet 3.5 are arranged at the left and right sides of the bottom of the reactor 3 respectively, and the acid outlet 3.4 is arranged in the middle of the bottom of the reactor 3. The reactor 3 is circulatedly connected through the first overflow port 3.1, the first precipitation tank 2, the acid liquid heating tank 1 and the first acid inlet 3.3, the reactor 3 is circulatedly connected through the second overflow port 3.2, the second precipitation tank 4 and the second acid inlet 3.5, and the reactor 3 is connected to the acid liquid precipitation tank 6 through the acid outlet 3.4.

[0029] The utility model adopts a two-way circulation system, and the specific working process is as follows:

[0030] Quartz sand is fed into the reactor 3 from the sand inlet 3.6 at the top of the reactor 3. The first circulation system passes through the first precipitation tank 2 and the acid heating tank 1. The acid circulates and heats up. After the temperature of the sand and acid in the reactor 3 reaches the set value, the first circulation is closed and the second circulation is started. The purpose of the first heating system is to quickly raise the acid temperature to the set value, minimize the volatilization of hydrofluoric acid, and ensure the concentration of the acid. The second circulation is mainly a heat preservation circulation to ensure that the acid in the tank is always in a flowing state, increase the reaction speed, and promptly flush the reactants on the surface of the sand particles so that the acid further reacts with the new surface of the sand particles.

[0031] After the acid washing of the reactor 3 is completed, the acid liquid is discharged to the acid liquid precipitation tank 6 for precipitation; the precipitated acid liquid is pumped into the acid mixing tank 5 through the acid pump, and then enters the acid liquid heating tank 1 to form an acid liquid circulation treatment system.

[0032] The pickled quartz sand is discharged from the sand outlet at the bottom of the reactor 3.

[0033] The utility model can also satisfy that the acid solutions in two reaction kettles are in a circulating state at the same time, so as to increase the reaction speed and save the reaction time.

[0034] The technical contents not specifically described in the present utility model and the above embodiments are the same as the prior art.

[0035] The above are only specific implementation methods disclosed in the present utility model, but the protection scope of the present utility model is not limited thereto. The protection scope of the present utility model shall be based on the protection scope of the claims.

Claims

1. A high-purity quartz sand pickling system, characterized in that: The high-purity quartz sand pickling system comprises an acid solution heating tank, a first precipitation tank, a reactor and a second precipitation tank. The reactor is cyclically connected through the first precipitation tank and the acid solution heating tank in sequence, and the reactor is cyclically connected with the second precipitation tank.

2. The high-purity quartz sand pickling system according to claim 1, characterized in that: The first overflow port and the second overflow port are respectively arranged on the left and right sides of the upper part of the reactor, the first acid inlet and the second acid inlet are arranged at the bottom of the reactor, the reactor is circulatedly connected through the first overflow port, the first precipitation tank, the acid heating tank and the first acid inlet, and the reactor is circulatedly connected through the second overflow port, the second precipitation tank and the second acid inlet.

3. The high-purity quartz sand pickling system according to claim 2, characterized in that: The high-purity quartz sand pickling system also includes an acid solution precipitation tank and an acid exchange tank, and the reactor is connected to the acid solution heating tank via the acid solution precipitation tank and the acid exchange tank in sequence.

4. The high-purity quartz sand pickling system according to claim 3 is characterized in that: The bottom of the reactor is also provided with an acid outlet, and the reactor is connected to the acid liquid precipitation tank through the acid outlet.

5. The high-purity quartz sand pickling system according to claim 4, characterized in that: The third acid inlet and the fourth acid inlet are respectively arranged on the left and right sides of the upper part of the acid liquid heating tank, the first precipitation tank is connected to the acid liquid heating tank through the fourth acid inlet, and the acid exchange tank is connected to the acid liquid heating tank through the third acid inlet.

6. The high-purity quartz sand pickling system according to claim 5, characterized in that: The first overflow port, the second overflow port, the first acid inlet, the acid outlet, the second acid inlet, the third acid inlet and the fourth acid inlet are all provided with control valves.

7. The high-purity quartz sand pickling system according to claim 6, characterized in that: The first acid inlet and the second acid inlet are respectively arranged on the left and right sides of the bottom of the reactor, and the acid outlet is arranged in the middle of the bottom of the reactor.

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