Clarification device suitable for impurity removal through chemical precipitation method

Abstract

The utility model discloses a clarification device suitable for impurity removal by a chemical precipitation method. A clarification barrel is divided into a semi-closed barrel-shaped structure and an annular interlayer through a barrel-shaped baffle. Mixed liquid flows in from the liquid inlet pipe and is mixed and stacked at the bottom of the semi-closed structure. Along with the continuous increase of the volume of the mixed liquid, the mixed liquid moves upwards along with the cylindrical baffle plate and settles under the gravity action and the step-by-step throttling action of the baffle plate II, the sediment flows downwards under the gravity action and is accumulated to the bottom of the clarifying cylinder, and the filtrate flows into the annular interlayer along the gap between the cylindrical baffle plate and the clarifying cylinder; and carrying out secondary natural sedimentation in the annular interlayer. The device has the functions of clarifying a reaction place and prolonging the staying time of a mixed solution, so that the mixed solution is separated in the mixing and clarifying reaction process and does not completely depend on subsequent separation of a filter press, the yield and efficiency of the clear solution are remarkably improved, and the economical efficiency of the clear solution is also improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sedimentation and clarification, and particularly relates to a clarification device suitable for impurity removal by chemical precipitation. BACKGROUND

[0002] The removal of impurity ions is always a necessary step for many industries, such as the leaching section in the production of lithium carbonate from spodumene in the lithium salt industry, the primary brine refining section in the chlor-alkali industry, and the removal of impurity ions from coarse salt. The removal of impurity ions is involved. In this process, the chemical precipitation method is the most frequently used method for removing impurity ions from materials. The chemical precipitation method refers to adding corresponding chemical reagents to the material to form a precipitate of impurity ions, and then removing the precipitate to complete the impurity removal function. This method has the advantages of high removal efficiency of impurity ions and is suitable for the removal of high-concentration impurity ions in preliminary impurity removal. However, the chemical precipitation method also has common difficulties: many impurity ions such as iron ions and magnesium ions easily form colloids such as iron hydroxide and magnesium hydroxide when the chemical precipitation method is used. This colloid is different from the precipitate, has adsorptive properties, and easily adsorbs and hides effective elements, making it difficult to settle and causing a long settling time and loss of effective elements.

[0003] Currently, for the precipitation of such impurity ions, flocculants, heavy precipitates, or equipment is added to extend the residence time, so that the colloids formed by such impurity ions settle and become precipitates and are discharged. However, the addition of flocculants introduces new impurities into the system, increasing the difficulty of subsequent process treatment; the addition of heavy precipitates increases the amount of filter residue in addition to increasing impurities; and the addition of equipment to extend the residence time increases the floor space and equipment investment.

[0004] Therefore, to solve the above technical problems, a clarification device that does not require additional flocculants or heavy precipitates and has both a reaction site and an extended residence time is needed. SUMMARY

[0005] The utility model wants to solve the technical problem of overcoming the prior art, and provides a clarification device suitable for impurity removal by chemical precipitation.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] A clarification device suitable for impurity removal by chemical precipitation, comprising a clarification cylinder, a cylindrical baffle, and a liquid inlet pipe; a gap is formed between the top end of the cylindrical baffle and the top end of the clarification cylinder, and the bottom end of the cylindrical baffle is sealingly connected to the inner wall of the clarification cylinder to form a semi-closed structure; a plurality of inclined and spaced baffles two for throttling are also installed on the inner wall of the cylindrical baffle; and the outlet of the liquid inlet pipe is arranged at the bottom end of the semi-closed structure.

[0008] As a further improvement of the above technical solution:

[0009] The clarifying cylinder is arranged in a tapered barrel shape with a narrow bottom and a wide top, and the bottom of the tapered barrel is provided with a slurry valve for controlling the discharge of slag.

[0010] The slurry valve is also connected to the filter pressing system.

[0011] A lens is also radially symmetrically mounted on the outer wall of the bottom end of the clarifying cylinder, and two groups of light emitting instruments and light receiving instruments with different heights are arranged in the horizontal direction of the lens, and the light receiving instrument is signal connected with the slurry valve.

[0012] A plurality of overflow ports are opened at the top of the interlayer between the clarifying cylinder and the cylindrical baffle, and a plurality of slag discharge ports are opened at the bottom for discharging the precipitate, and the mixed liquid passes through the liquid inlet pipe and the baffle two in turn, and flows out from the overflow port.

[0013] A heating pipe for heating the mixed liquid is also mounted around the outer wall of the clarifying cylinder.

[0014] The angle α between the baffle two and the inner wall of the cylindrical baffle is arranged to be 25°-45°.

[0015] A material mixer and a pH detector are also mounted at the front end of the liquid inlet pipe, and the material mixer is connected with the material pipe and the medicament pipe at the same time, and the feeding speed is controlled through the regulating valve.

[0016] The liquid inlet pipe penetrates through the clarifying cylinder and the cylindrical baffle, and the outlet height is higher than the highest end of the lens.

[0017] Compared with the prior art, the advantages of the present application are:

[0018] The device has the functions of clarifying reaction site and prolonging the residence of mixed liquid, so that the mixed liquid starts to separate during the mixing and clarifying reaction process, and no longer depends on the subsequent filter press for separation, which significantly improves the output rate and efficiency of the clear liquid, and improves the economy. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of a clarifying device according to an embodiment;

[0020] Figure 2 is a schematic view of the cooperation structure of the cylindrical baffle and the baffle two in the second embodiment.

[0021] The labels in the diagram represent: 1. Clarifying cylinder; 11. Overflow port; 12. Slurry valve; 13. Lens; 14. Light emitter; 15. Light receiver; 16. Slag discharge port; 17. Heating tube; 2. Cylindrical baffle; 21. Baffle two; 3. Liquid inlet pipe; 31. Material mixer; 32. pH meter; 33. Material pipe; 34. Reagent pipe; 35. Regulating valve. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] like Figure 1 As shown, the clarification device for chemical precipitation removal in this embodiment includes a clarification cylinder 1, a cylindrical baffle 2, and an inlet pipe 3. A gap exists between the top of the cylindrical baffle 2 and the top of the clarification cylinder 1, and its bottom end is sealed to the inner wall of the clarification cylinder 1, forming a semi-closed structure. Several inclined, spaced baffles 21 for throttling are also installed on the inner wall of the cylindrical baffle 2. The outlet of the inlet pipe 3 is located at the bottom of the semi-closed structure. In this embodiment, chemical precipitation is used to remove magnesium hydroxide. The cylindrical baffle 2 is installed inside the clarification cylinder 1, and its bottom inclined section is sealed to the clarification cylinder 1. Its top is lower than the top of the clarification cylinder 1, thus creating a gap for the flow of the mixed liquid and approximately dividing the clarification cylinder 1 into a semi-closed cylindrical structure and an annular interlayer. The mixed liquid flows in from the inlet pipe 3 and mixes and accumulates at the bottom of the semi-closed structure. As the volume of the mixed liquid increases, it moves upward with the cylindrical baffle 2 and gradually fills the semi-closed structure via the baffles 21. Magnesium hydroxide colloid precipitates under the influence of gravity and the stepwise throttling effect of baffle 21. The precipitate accumulates downwards to the bottom of the clarifier 1 due to gravity, while the filtrate flows into the annular interlayer through the gap between the cylindrical baffle 2 and the clarifier 1. A second natural sedimentation occurs in the annular interlayer. Specifically, the fixed end of baffle 21 is connected to the cylindrical baffle 2, and its free end is inclined downwards relative to the fixed end. In this device, by setting the cylindrical baffle 2, the clarifier 1 is divided into two parts: a semi-enclosed structure and an annular interlayer structure. In the semi-enclosed structure, the baffle 2 prolongs the movement and residence time of the mixture, so that in this process, the semi-enclosed structure serves as the reaction site for the impurity removal reaction and also enhances the impurity removal effect through gravity and throttling. In the annular interlayer, natural sedimentation occurs again under gravity, allowing the clear liquid and precipitate to continue to separate. Therefore, this device serves as both a clarification reaction site and an extended residence time for the mixed liquor, allowing the mixed liquor to begin separating during the mixing and clarification reaction process, no longer relying entirely on subsequent filter press separation. This significantly improves the yield and efficiency of the clarified liquor, as well as its economic efficiency.

[0025] In this embodiment, the clarifying cylinder 1 is provided in the shape of a tapered barrel with a narrow bottom and a wide top, and the bottom of the tapered barrel is provided with a slurry valve 12 for controlling the discharge of the sludge. In this embodiment, the slurry valve 12 is also connected to the filter pressing system. The clarifying cylinder 1 is provided in the shape of a tapered barrel with a narrow bottom and a wide top, so that the precipitate accumulates at the bottom of the clarifying cylinder 1 under the action of gravity, and the concentration of the precipitate decreases from bottom to top. When the precipitate at the bottom accumulates to a certain amount, the slurry valve 12 is opened, so that the part with the highest concentration of precipitate is discharged and enters the next stage of the filter pressing system, thereby improving the efficiency of the filter pressing operation.

[0026] In this embodiment, a lens 13 is also radially symmetrically installed on the outer wall of the bottom end of the clarifying cylinder 1, and two groups of light emitting instruments 14 and light receiving instruments 15 with different heights are arranged in the horizontal direction of the lens 13, and the light receiving instruments are signal connected with the slurry valve 12. The highest point of the lens 13 is slightly lower than the liquid inlet pipe 3, and the lowest point is slightly higher than the discharge port at the bottom. Thus, the lens 13 is prevented from being blocked by the liquid inlet pipe 3 and the discharge port. The magnesium hydroxide precipitated at the bottom of the clarifying cylinder 1 gradually deposits according to gravity, and the concentration decreases from bottom to top. As the amount of precipitate increases, the porosity of the accumulation decreases, and the precipitate first blocks the light path at the bottom, so that the signal received by the bottom light receiving instrument 15 corresponding to the light emitting instrument 14 decreases. When the precipitate accumulates to block the light path at the top, the signal received by the top light receiving instrument 15 corresponding to the light emitting instrument 14 decreases to a set value, and the slurry valve 12 for discharging sludge at the bottom of the clarifying cylinder 1 is opened in a chain, so that the precipitated magnesium hydroxide enters the filter pressing system for filter pressing and sludge removal.

[0027] In this embodiment, a plurality of overflow ports 11 are provided at the top of the interlayer between the clarifying cylinder 1 and the cylindrical baffle 2, and a plurality of sludge discharge ports 16 are provided at the bottom for discharging the precipitate. The mixed liquid flows out of the overflow ports 11 after passing through the liquid inlet pipe 3 and the baffle 21. The height of the overflow ports 11 is lower than the top of the cylindrical baffle 2. When the mixed liquid flows into the annular interlayer after passing through the baffle 21, natural sedimentation occurs, the precipitate sinks to the bottom and is discharged from the sludge discharge port 16, and the accumulated clear liquid is discharged from the overflow port 11 and can continue to be connected to the subsequent precision filtration system, thereby ensuring the effect of removing the precipitate.

[0028] In this embodiment, a heating pipe 17 for heating the mixed liquid is also installed around the outer wall of the clarifying cylinder 1. By providing the heating pipe 17 to heat the mixed liquid, the colloidal properties of magnesium hydroxide are destroyed, the particle size is increased, and the viscosity is reduced, so as to facilitate sedimentation.

[0029] In the embodiment, the included angle a between the baffle two 21 and the inner wall of the cylindrical baffle 2 is 25-45 degrees. The baffle two 21 is inclinedly connected with the inner wall of the cylindrical baffle 2, and the inclination angle a is 25-45 degrees, so that the deposition can be prevented from accumulating on the baffle two 21, and the resistance of the mixed liquid rising is not too large.

[0030] In the embodiment, the front end of the liquid inlet pipe 3 is also provided with a material mixer 31 and a pH detector 32, the material mixer 31 is connected with a material pipe 33 and a medicament pipe 34 at the same time, and the feeding speed is controlled through an adjusting valve 35. By directly connecting the material pipe 33 and the medicament pipe 34 with the material mixer 31, the material and the medicament are fully mixed in the material mixer 31 to form a mixed liquid, and then the mixed liquid enters the clarifying cylinder 1 through the liquid inlet pipe 3, so that the reaction place and the impurity removal place are integrated, the reaction process can be detected in real time through the pH detector 32, the adding amount of the medicament can be accurately controlled through the adjusting valve 35, so that the reaction speed is regulated, and the accumulation amount of the deposition in the clarifying cylinder 1 can be observed to reasonably adjust through the adjusting valve 35.

[0031] In the embodiment, the liquid inlet pipe 3 penetrates the clarifying cylinder 1 and the cylindrical baffle 2, and the outlet height is higher than the highest end of the lens 13. Since the cylindrical baffle 2 divides the clarifying cylinder 1 into two parts, in order to ensure the impurity removal effect, the material needs to be fed from the bottom end of the clarifying cylinder 1, and the feeding process is a sedimentation process, so the liquid inlet pipe 3 needs to penetrate the clarifying cylinder 1 and the cylindrical baffle 2 and extend to the bottom end of the clarifying cylinder 1, and in order to ensure the normal operation of the lens 13, the light emitter 14 and the light receiver 15, the liquid inlet pipe 3 needs to prevent the light from being blocked, so the outlet height needs to be higher than the highest end of the lens 13.

[0032] Embodiment 2

[0033] As shown in Figure 2 The second embodiment of the clarifying device suitable for chemical precipitation method impurity removal of the utility model is basically same with the embodiment 1, the difference lies in: the baffle two 21 includes solid area and flow guide hole area, and the area of solid area is 1-1.5 times of the area of flow guide hole area. The mixed liquid passes through the flow guide hole area of baffle two 21 and moves obliquely upward along the solid area, so that the colloid and deposition in the mixed liquid can be blocked by baffle two 21 and flow down to the bottom of clarifying cylinder 1 and deposit, and the area ratio of solid area and flow guide hole area is designed according to the deposition amount and characteristics of material to achieve the best impurity removal effect.

[0034] Although the utility model has disclosed as above with preferable embodiments, however, not to limit the utility model. Any skilled person in the art, without departing from the utility model technical scheme range, can utilize the above disclosed technical content to make many possible changes and modifications to the utility model technical scheme, or modify as equivalent variation equivalent embodiment. Therefore, any simple modification, equivalent variation and modification made to the above embodiments according to the technical essence of the utility model, which does not depart from the content of the utility model technical scheme, should fall within the scope of the utility model technical scheme protection.

Claims

1. A clarification apparatus suitable for chemical precipitation to remove impurities, characterized in that: It includes a clarifying cylinder (1), a cylindrical baffle (2), and an inlet pipe (3); there is a gap between the top end of the cylindrical baffle (2) and the top end of the clarifying cylinder (1), and its bottom end is sealed to the inner wall of the clarifying cylinder (1) to form a semi-closed structure; a number of baffles (21) for extending the liquid flow path are also installed on the inner wall of the cylindrical baffle (2), the fixed end of the baffle (21) is connected to the cylindrical baffle (2), and its free end is inclined downward relative to the fixed end; the outlet of the inlet pipe (3) is located at the bottom end of the semi-closed structure.

2. The clarification apparatus for chemical precipitation purification according to claim 1, characterized in that: The clarification cylinder (1) is configured as a conical barrel shape that is narrow at the bottom and wide at the top, and the bottom of the conical barrel is provided with a slurry valve (12) for controlling the discharge of slag.

3. The clarification apparatus for chemical precipitation purification according to claim 2, characterized in that: The slurry valve (12) is also connected to the filter press system.

4. The clarification apparatus for chemical precipitation purification according to claim 2, characterized in that: Lenses (13) are symmetrically installed on the outer wall at the bottom of the clarification cylinder (1), and two sets of light emitters (14) and light receivers (15) at different heights are arranged in the horizontal direction of the lenses (13). The light receivers (15) are connected to the slurry valve (12) via signal.

5. The clarification apparatus for chemical precipitation purification according to claim 1, characterized in that: The top of the interlayer between the clarification cylinder (1) and the cylindrical baffle (2) is provided with several overflow ports (11), and the bottom is provided with several slag discharge ports (16) for discharging precipitates. The mixed liquid flows out from the overflow ports (11) after passing through the inlet pipe (3) and the second baffle (21) in sequence.

6. The clarification apparatus for chemical precipitation purification according to claim 5, characterized in that: The outer wall of the clarification cylinder (1) is also surrounded by heating tubes (17) for heating the mixture.

7. The clarification apparatus for chemical precipitation purification according to claim 1, characterized in that: The included angle α between the second baffle (21) and the inner wall of the cylindrical baffle (2) is set to 25°~45°.

8. The clarification apparatus for chemical precipitation purification according to claim 1, characterized in that: The front end of the liquid inlet pipe (3) is also equipped with a material mixer (31) and a pH meter (32), and the material mixer (31) is connected to both the material pipe (33) and the reagent pipe (34).

9. The clarification apparatus for chemical precipitation purification according to claim 4, characterized in that: The outlet height of the liquid inlet pipe (3) is higher than the highest end of the lens (13).

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