Device for improving separation and filtration of lithium-containing slurry in lithium carbonate process

Abstract

The utility model discloses a device for improving separation and filtration of lithium-containing slurry in a lithium carbonate process, which comprises a rubber belt type vacuum filter, an auxiliary mechanism is fixedly mounted on the rubber belt type vacuum filter, the auxiliary mechanism is provided with two feed ports, and quicklime slurry and lithium-containing slurry are respectively pressurized and introduced into the feed ports. The quick lime slurry and the lithium slurry are mixed through the auxiliary mechanism to increase the PH value so as to destroy the stability of colloidal particles in the lithium-containing slurry, dispersed small particles are mutually gathered to form large particles, the quick lime slurry and the lithium slurry are rapidly mixed, so that the PH value of a mixed solution is increased, the stability of the colloidal particles in the lithium-containing slurry is destroyed, and the stability of the lithium-containing slurry is improved. According to the present invention, the dispersed small particles are mutually gathered to form the large particles so as to form the multi-grid-shaped skeleton, and the multi-grid-shaped skeleton is paved on the filter cloth, such that the hydroxide jelly such as iron ions, aluminum ions and the like and the filter cake are retained on the surface of the filter cloth, and the water content of the filter cake can be reduced;

Description

Technical Field

[0001] The utility model relates to the technical field of lithium carbonate technology, in particular to a device for improving the separation and filtration of lithium-containing slurry in the lithium carbonate process. Background Art

[0002] In the process of preparing lithium carbonate from spodumene, the acid-clinker is transported to a leaching tank and water is added to form an acid-clinker slurry, and then it is transported to a neutralization tank where calcium carbonate powder is added to neutralize the residual acid in the acid-clinker. When the acid-clinker enters the liquid phase, due to the presence of free sulfuric acid, sulfuric acid immediately reacts with compounds such as Fe and Al in the ore to form ferric sulfate and aluminum sulfate. When neutralizing the free acid in the liquid phase with calcium carbonate powder, as the pH value increases, iron ions, aluminum ions, etc. precipitate in the form of hydroxide colloids. The particles of this part of the colloid are very small and insoluble in water. During the filtration and washing process on a rubber belt vacuum filter, they easily pass through the filter cloth, easily contaminate the filtered liquid, causing trouble for the subsequent purification and impurity removal processes. Moreover, the water content of the filter cake is high, and it is not easy to separate the effective component lithium sulfate, resulting in relatively serious lithium waste.

[0003] Therefore, in view of the above problems, the present utility model proposes a device for improving the separation and filtration of lithium-containing slurry in the lithium carbonate process. Summary of the Utility Model

[0004] The purpose of the present utility model is to solve the problems that iron ions, aluminum ions, etc. precipitate in the form of hydroxide colloids by those skilled in the prior art. The particles of this part of the colloid are very small and insoluble in water. During the filtration and washing process on a rubber belt vacuum filter, they easily pass through the filter cloth, easily contaminate the filtered liquid, causing trouble for the subsequent purification and impurity removal processes. Moreover, the water content of the filter cake is high, and it is not easy to separate the effective component lithium sulfate.

[0005] Therefore, in view of the above problems, the present utility model thus proposes a device for improving the separation and filtration of lithium-containing slurry in the lithium carbonate process, including a rubber belt vacuum filter. An auxiliary mechanism is fixedly installed on the rubber belt vacuum filter. The auxiliary mechanism is provided with two feed ports, and a lime slurry and a lithium-containing slurry are respectively pressurized and introduced. By mixing the two materials through the auxiliary mechanism, the pH value is increased to destroy the stability of the colloid particles in the lithium-containing slurry, so that the dispersed small particles aggregate with each other to form large particles.

[0006] Preferably, the auxiliary mechanism includes a mixing tank and a blanking rack. The mixing tank is fixedly installed above the rubber belt vacuum filter, and the upper part of the mixing tank is communicated with the blanking rack. The upper part of the blanking rack is provided with a first feed inlet and a second feed inlet for introducing quicklime slurry and lithium-containing slurry respectively. An inclined chute is arranged inside the mixing tank, and the bottom of the inclined chute is inclined downward. The middle of the inclined chute is rotatably connected with a rotating rod through a bearing. A connecting ring is fixedly installed on one side of the rotating rod, and a plurality of spoon-shaped fan blades are fixedly installed on the outer side of the connecting ring. The position of the spoon-shaped fan blades on one side is located below the blanking rack. A mixing blade is also fixedly installed on the other side of the rotating rod. A bottom chute is arranged at the bottom of the mixing tank, and the bottom chute is communicated with the inclined chute. An outlet hole is arranged at the bottom of the bottom chute, and the mixed material is put onto the rubber belt vacuum filter through the outlet hole.

[0007] Beneficial effects:

[0008] The quicklime slurry (mainly composed of calcium hydroxide) and the lithium-containing slurry are introduced through the first feed inlet and the second feed inlet. Then, the connecting ring and the rotating rod are driven to rotate. Then, the two materials are quickly mixed by the rotating rod, so as to quickly increase the pH value of the mixed solution of the lime slurry (mainly composed of calcium hydroxide) and the lithium-containing slurry. Since the main component of the quicklime slurry is calcium hydroxide, the pH value of the lithium-containing slurry can be increased, the stability of the colloidal particles in the lithium-containing slurry can be destroyed, and the dispersed small particles can aggregate with each other to form large particles, forming a multi-grid-like skeleton, which is laid on the filter cloth to intercept iron ions, aluminum ions, etc. in the form of hydroxide colloids and filter cakes on the surface of the filter cloth, and the water content of the filter cake can also be reduced. Description of the drawings

[0009] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0010] Figure 2 It is a schematic diagram of the structure of the auxiliary mechanism of the present invention;

[0011] Figure 3 It is a schematic cross-sectional view of the structure of the auxiliary mechanism of the present invention;

[0012] Figures 1 to 3 The reference numerals are respectively: rubber belt vacuum filter 1, mixing tank 2, blanking rack 201, first feed inlet 202, second feed inlet 203, inclined chute 204, bottom chute 205, blanking hole 2051, rotating rod 3, connecting ring 301, spoon-shaped fan blade 302, mixing blade 303. Specific implementation manners

[0013] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0014] Refer toFigures 1 to 3 , a device for improving the separation and filtration of lithium-containing slurry in the lithium carbonate process, including a rubber belt vacuum filter 1. An auxiliary mechanism is fixedly installed on the rubber belt vacuum filter 1. The auxiliary mechanism is provided with two feed ports, and a quicklime slurry (mainly composed of calcium hydroxide) and a lithium-containing slurry are respectively pressurized and introduced. By mixing the two materials through the auxiliary mechanism to increase the pH value, the stability of the colloidal particles in the lithium-containing slurry is destroyed, so that the dispersed small particles aggregate with each other to form large particles.

[0015] Preferably: The auxiliary mechanism includes a stirring tank 2 and a feeding frame 201. The stirring tank 2 is fixedly installed on the upper part of the rubber belt vacuum filter 1. The upper part of the stirring tank 2 is communicated with the feeding frame 201. The upper part of the feeding frame 201 is provided with a feed port one 202 and a feed port two 203 for respectively introducing the quicklime slurry (mainly composed of calcium hydroxide) and the lithium-containing slurry. An inclined groove 204 is arranged inside the stirring tank 2. The bottom of the inclined groove 204 is inclined downward. The middle part of the inclined groove 204 is rotationally connected with a rotating rod 3 through a bearing. A connecting ring 301 is fixedly installed on one side of the rotating rod 3. A plurality of spoon-shaped fan blades 302 are fixedly installed on the outer side of the connecting ring 301. The position of the spoon-shaped fan blades 302 on one side is located below the feeding frame 201. A stirring blade 303 is also fixedly installed on the other side of the rotating rod 3. The quicklime slurry (mainly composed of calcium hydroxide) and the lithium slurry are introduced from the feed port one 202 and the feed port two 203. At this time, the quicklime slurry (mainly composed of calcium hydroxide) and the lithium slurry will fall on the spoon-shaped fan blades 302 after passing through the feeding frame 201. When the spoon-shaped part of the spoon-shaped fan blades 302 contacts the falling quicklime slurry (mainly composed of calcium hydroxide) and the lithium slurry, there will be a tendency to move downward, thereby driving the connecting ring 301 and the rotating rod 3 to rotate. After that, when the quicklime slurry (mainly composed of calcium hydroxide) and the lithium slurry fall into the inclined groove 204, they will move downward due to the downward inclination of the bottom of the inclined groove 204. At the same time, the rotation of the rotating rod 3 will drive the stirring blade 303 to rotate, so as to quickly mix the two materials.

[0016] Working principle:

[0017] Lime slurry (mainly composed of calcium hydroxide) and lithium slurry are introduced from feed inlet 202 and feed inlet 203. At this time, after the lime slurry (mainly composed of calcium hydroxide) and lithium slurry pass through the feeding rack 201, they will fall on the spoon-shaped fan blades 302. When the spoon-shaped part of the spoon-shaped fan blades 302 contacts the falling lime slurry (mainly composed of calcium hydroxide) and lithium slurry, there will be a tendency to move downward, thereby driving the connecting ring 301 and the rotating rod 3 to rotate. After that, when the lime slurry (mainly composed of calcium hydroxide) and lithium slurry fall into the inclined chute 204, they will move downward due to the inclination of the bottom of the inclined chute 204. At the same time, the rotation of the rotating rod 3 will drive the stirring blades 303 to rotate, so as to quickly mix the two materials. Then, they fall into the rubber belt vacuum filter 1 through the feeding holes 2051 in the bottom tank 205 for solid-liquid separation, thereby accelerating the mixing speed of the lime slurry (mainly composed of calcium hydroxide) and lithium slurry, and better quickly increasing the pH value of the mixed solution of the lime slurry (mainly composed of calcium hydroxide) and lithium slurry. Since the main component of the lime slurry is calcium hydroxide, it can increase the pH value of the lithium-containing slurry, destroy the stability of the colloidal particles in the lithium-containing slurry, make the dispersed small particles aggregate with each other to form large particles, form a multi-grid-like skeleton, spread on the filter cloth, intercept iron ions, aluminum ions, etc. in the form of hydroxide colloids and filter cakes on the surface of the filter cloth, and can also reduce the water content of the filter cake.

[0018] Test data:

[0019] 1. The neutralized lithium-containing slurry is separately pumped onto a rubber belt vacuum filter for washing and filtering, and the lithium content concentration and impurity content in the filtered leachate (Table 1)

[0020]

[0021] Table 1

[0022] 2. A kind of auxiliary material, lime slurry, and the neutralized lithium-containing slurry are mixed to increase the pH value and then pumped onto a rubber belt vacuum filter together for washing and filtering. The lithium content concentration and impurity content of the filtered leachate (Table 2)

[0023]

[0024] Table 2

[0025] Comparing the above two methods based on the data, it can be seen that the second method effectively improves the separation and filtration effect of the lithium-containing slurry, increases the lithium content in the leaching solution, effectively controls the moisture content of the leaching residue, improves the lithium utilization rate and the impurity removal effect, and reduces the workload of the purification and impurity removal process. The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. An apparatus for improving the separation and filtration of lithium-containing slurry in the lithium carbonate process, comprising a rubber belt vacuum filter (1), characterized in that: An auxiliary mechanism is fixedly installed on a rubber belt vacuum filter (1). The auxiliary mechanism is provided with two feed ports, and a lime slurry and a lithium-containing slurry are respectively pressurized and introduced. Through the auxiliary mechanism, the two materials are mixed to increase the pH value to destroy the stability of the colloidal particles in the lithium-containing slurry, so that the dispersed small particles aggregate with each other to form large particles; The auxiliary mechanism includes a mixing tank (2) and a feeding rack (201). The mixing tank (2) is fixedly installed on the upper part of the rubber belt vacuum filter (1). The upper part of the mixing tank (2) is communicated with the feeding rack (201). The upper part of the feeding rack (201) is provided with a first feed port (202) and a second feed port (203) for respectively introducing the lime slurry and the lithium-containing slurry; An inclined groove (204) is arranged inside the mixing tank (2). The bottom of the inclined groove (204) is inclined downward. A rotating rod (3) is rotatably connected to the middle of the inclined groove (204) through a bearing. A connecting ring (301) is fixedly installed on one side of the rotating rod (3). A plurality of spoon-shaped fan blades (302) are fixedly installed on the outer side of the connecting ring (301). The positions of the spoon-shaped fan blades (302) on one side are located below the feeding rack (201).

2. The device for improving the separation and filtration of lithium-containing slurry in the lithium carbonate process according to claim 1, wherein A stirring blade (303) is also fixedly installed on the other side of the rotating rod (3).

3. The device for improving the separation and filtration of lithium-containing slurry in the lithium carbonate process according to claim 2, characterized in that, A bottom groove (205) is arranged at the bottom of the mixing tank. The bottom groove (205) is communicated with the inclined groove (204). An outlet hole (2051) is arranged at the bottom of the bottom groove (205). The mixed material is put into the rubber belt vacuum filter (1) through the outlet hole (2051).

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