Lithium carbonate production waste liquid treatment device

Abstract

The utility model provides a lithium carbonate production waste liquid treatment device. The lithium carbonate production waste liquid treatment device comprises an acidification tank, a PH regulating tank and an evaporator which are connected in sequence, the acidification tank is used for acidizing the lithium carbonate centrifugal waste liquid; the acidification tank comprises an acidification tank body and a sulfuric acid adding device, and the sulfuric acid adding device is connected with the acidification tank body; the pH adjusting tank is used for adjusting the pH of the acidified lithium carbonate waste liquid; the PH regulating tank comprises a regulating tank body and caustic soda flake adding equipment, and the caustic soda flake adding equipment is connected with the regulating tank body; the evaporator is used for concentrating and crystallizing the lithium carbonate waste liquid subjected to pH regulation. According to the utility model, the structural design of the acidification tank, the PH regulation tank and the evaporator is adopted, the waste liquid after lithium precipitation of lithium carbonate is treated, and after acidification, PH regulation and evaporative crystallization, neutralized precipitates and crystals are removed, so that the recovered concentrated liquid is obtained, the waste is utilized, and the environmental pollution is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium carbonate technical field, especially a kind of lithium carbonate production waste liquid treatment device. BACKGROUND

[0002] Lithium carbonate waste liquid is mainly produced in the production process of lithium carbonate, such as lithium carbonate purification and other links. These waste liquids often contain high concentrations of lithium, acid, heavy metal ions and other harmful substances. If directly discharged into the environment, lithium carbonate waste liquid will cause serious pollution to water, soil and ecological system. At the same time, as a kind of rare metal resources, direct discharge is also a waste of its resources.

[0003] The traditional lithium carbonate waste liquid treatment method is mostly neutralization precipitation method, which generates precipitate by adding alkaline substances to neutralize the acid in the waste liquid. Another common method is evaporation crystallization method, which evaporates the waste liquid by heating, and then collects and processes the generated lithium carbonate crystals. At the same time, considering the scarcity and value of lithium resources, recycling and reusing lithium in lithium carbonate waste liquid has become an urgent need for enterprises. This not only can reduce production cost, but also can improve economic and social benefits of enterprises.

[0004] However, the current lithium carbonate waste liquid treatment device is still single, without neutralization precipitation method, evaporation crystallization method and lithium recycling and reuse integrated waste liquid treatment device, so the waste liquid treatment is not complete, the treatment effect is not good, the lithium resource recovery degree is not high, and the resource is not friendly. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of lithium carbonate production waste liquid treatment device, to solve the technical problem that waste liquid treatment is not complete in background art, treatment effect is not good, lithium resource recovery degree is not high, and resource is not friendly.

[0006] In order to achieve the above purpose, the utility model provides a kind of lithium carbonate production waste liquid treatment device, which comprises acidification tank, PH adjusting tank and evaporator connected in sequence;

[0007] The acidification tank acidifies lithium carbonate centrifugal waste liquid;The acidification tank includes acidification tank body and sulfuric acid adding device, and the sulfuric acid adding device is connected with the acidification tank body;

[0008] The PH adjusting tank adjusts the PH of acidified lithium carbonate waste liquid;The PH adjusting tank includes adjusting tank body and flake alkali adding equipment, and the flake alkali adding equipment is connected with the adjusting tank body;

[0009] The evaporator concentrates and crystallizes the PH-adjusted lithium carbonate waste liquid.

[0010] Preferably, the acidification tank further comprises a waste liquid inlet one, an acidification liquid inlet, a stirring device one and a waste liquid outlet one, the waste liquid inlet one, the waste liquid outlet one and the acidification liquid inlet are connected with the acidification tank body, and the stirring device one is arranged on the acidification tank body.

[0011] Preferably, the sulfuric acid adding device comprises a sulfuric acid tank, a medicine extraction branch, a medicine adding metering pump, an intermediate buffer chamber, a medicine adding branch, a medicine adding valve and a medicine extraction valve, the sulfuric acid tank is connected with the intermediate buffer chamber through the medicine extraction branch, the medicine extraction valve is arranged on the medicine extraction branch, the intermediate buffer chamber is connected with the acidification tank body through the medicine adding branch, and the medicine adding valve is arranged on the medicine adding branch.

[0012] Preferably, the sulfuric acid adding device further comprises a backflow branch, a backflow metering pump and a backflow valve, the backflow branch connects the intermediate buffer chamber and the sulfuric acid tank, and the backflow metering pump and the backflow valve are arranged on the backflow branch.

[0013] Preferably, the PH adjusting tank further comprises a waste liquid inlet two, a waste liquid outlet two, a piece of alkali liquid inlet and a stirring device two, the waste liquid inlet two, the waste liquid outlet two and the piece of alkali liquid inlet are connected with the acidification tank body, and the stirring device two is arranged on the adjusting tank body.

[0014] Preferably, the piece of alkali adding equipment comprises a alkali storage tank, an alkali liquid transfer tank, an alkali liquid transfer conveying pipe, a transfer pump, a backflow pipe, an alkali adding pipe and an alkali adding metering device, the alkali storage tank is connected with the alkali liquid transfer tank through the alkali liquid transfer conveying pipe, the transfer pump is arranged on the alkali liquid transfer conveying pipe, the backflow pipe connects the alkali liquid transfer tank and the alkali storage tank, the alkali adding pipe connects the alkali liquid transfer tank and the adjusting tank body, and the alkali adding metering device is arranged on the alkali adding pipe.

[0015] Preferably, the evaporator is an MVR evaporator, comprising an evaporator body, a compressor and a heater, the evaporator body concentrates and crystallizes the PH adjusted lithium carbonate waste liquid, the heater provides heat energy for the evaporator body, and the compressor compresses the steam of the evaporator body to provide heat energy for the heater.

[0016] Preferably, it further comprises a filter press, which is arranged between the PH adjusting tank and the evaporator, comprising a pressing mechanism and a filtering mechanism, and the pressing mechanism presses the filtering mechanism.

[0017] Preferably, it further comprises a crystallization tank and a centrifugal machine, the crystallization tank is arranged at the rear end of the evaporator, and the centrifugal machine is arranged at the rear end of the crystallization tank.

[0018] Preferably, the centrifuge also includes a concentrate treatment device, which is located at the rear end of the centrifuge and is equipped with a phosphoric acid addition device.

[0019] The lithium carbonate production waste liquid treatment device of this utility model has the following beneficial effects:

[0020] This system employs an acidification tank, pH adjustment tank, and evaporator to treat waste liquid after lithium carbonate precipitation. After acidification, pH adjustment, and evaporation crystallization, neutralized precipitates and crystals are removed, yielding a concentrated recovery solution, thus utilizing waste and reducing environmental pollution. First, the lithium carbonate centrifugal waste liquid is acidified in the acidification tank. Then, the pH of the acidified lithium carbonate waste liquid is adjusted in the pH adjustment tank to form neutralized precipitates. The primary crystals in the pH-adjusted lithium carbonate waste liquid are removed by a filter press. The evaporator concentrates and crystallizes the pH-adjusted lithium carbonate waste liquid. The crystallization tank cools the hot solution in the evaporator for recrystallization. The centrifuge removes anhydrous sodium sulfate from the waste liquid. The concentrated solution treatment device includes a phosphoric acid addition unit, which reacts lithium ions in the waste liquid with phosphoric acid to synthesize lithium phosphate with recovery value. The use of novel evaporators and other technologies enables efficient waste liquid treatment while reducing energy consumption. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a preferred embodiment of a lithium carbonate production waste liquid treatment device according to the present invention;

[0022] Figure 2 for Figure 1 The diagram shows a preferred embodiment of a sulfuric acid addition device in a lithium carbonate production waste liquid treatment apparatus.

[0023] Figure 3 for Figure 1 The diagram shows a preferred embodiment of a caustic soda flake addition device in a lithium carbonate production waste liquid treatment apparatus.

[0024] In the picture:

[0025] 1. Acidification tank; 2. pH adjustment tank; 3. Filter press; 4. Evaporator; 5. Crystallization tank; 6. Centrifuge; 7. Concentrate treatment unit;

[0026] 11. Acidification tank body; 12. Sulfuric acid addition device; 13. Waste liquid inlet 1; 14. Acidification liquid inlet; 15. Stirring device 1; 16. Waste liquid outlet 1;

[0027] 121. Sulfuric acid tank; 122. Pumping branch; 123. Dosing metering pump; 124. Intermediate buffer chamber; 125. Dosing branch; 126. Dosing valve; 127. Pumping valve; 128. Return branch; 129. Return metering pump; 120. Return valve;

[0028] 21. Adjustment tank body; 22. Caustic soda flake addition equipment; 23. Waste liquid inlet two; 24. Waste liquid outlet two; 26. Agitator two;

[0029] 221. Alkali storage tank; 222. Alkali transfer tank; 223. Alkali transfer and delivery pipe; 224. Transfer pump; 225. Return pipe; 226. Alkali addition pipe; 227. Alkali metering device;

[0030] 31. Pressing mechanism; 32. Filtration mechanism;

[0031] 41. Evaporator body; 42. Compressor; 43. Heater. Detailed Implementation

[0032] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0033] This invention addresses existing problems by providing a lithium carbonate production wastewater treatment device.

[0034] In one embodiment, a lithium carbonate production wastewater treatment device, such as Figures 1 to 3 As shown, it includes an acidification tank 1, a pH adjustment tank 2, a filter press 3, an evaporator 4, a crystallization tank 5, a centrifuge 6, and a concentrate treatment device 7 connected in sequence.

[0035] The acidification tank 1 is used to acidify the lithium carbonate centrifugal waste liquid.

[0036] The pH adjustment tank 2 is used to adjust the pH of the acidified lithium carbonate waste liquid;

[0037] The filter press 3 is located between the pH adjustment tank 2 and the evaporator 4. The filter press 3 removes the initial crystals from the pH-adjusted lithium carbonate waste liquid. It includes a pressing mechanism 31 and a filtering mechanism 32. The pressing mechanism 31 presses the filtering mechanism 32.

[0038] The evaporator 4 concentrates and crystallizes the pH-adjusted lithium carbonate waste liquid.

[0039] The crystallization tank 5 is located at the rear end of the evaporator 4 to cool the hot solution in the evaporator 4 for recrystallization.

[0040] The centrifuge 6 is located at the rear end of the crystallization tank 5, and the centrifuge 6 removes anhydrous sodium sulfate from the waste liquid.

[0041] The concentrated liquid treatment device 7 is arranged at the rear end of the centrifuge 6, and is provided with a phosphoric acid adding device to react lithium ions in the waste liquid with phosphoric acid to synthesize lithium phosphate with recycling value.

[0042] The acidification tank 1 comprises an acidification tank body 11, a sulfuric acid adding device 12, a waste liquid inlet one 13, an acidification liquid inlet 14, a stirring device one 15, and a waste liquid outlet one 16. The sulfuric acid adding device 12 is connected with the acidification tank body 11; the waste liquid inlet one 13, the waste liquid outlet one 16, and the acidification liquid inlet 14 are all connected with the acidification tank body 11, and the stirring device one 15 is arranged on the acidification tank body 11.

[0043] The sulfuric acid adding device 12 comprises a sulfuric acid tank 121, a medicine extraction branch 122, a medicine adding metering pump 123, an intermediate buffer chamber 124, a medicine adding branch 125, a medicine adding valve 126, a medicine extraction valve 127, a backflow branch 128, a backflow metering pump 129, and a backflow valve 120. The sulfuric acid tank 121 is connected with the intermediate buffer chamber 124 through the medicine extraction branch 122, the medicine extraction valve 127 is arranged on the medicine extraction branch 122, the intermediate buffer chamber 124 is connected with the acidification tank body 11 through the medicine adding branch 125, and the medicine adding valve 126 is arranged on the medicine adding branch 125. The backflow branch 128 connects the intermediate buffer chamber 124 and the sulfuric acid tank 121, and the backflow metering pump 129 and the backflow valve 120 are arranged on the backflow branch 128.

[0044] The PH adjusting tank 2 comprises an adjusting tank body 21, a flake alkali adding device 22, a waste liquid inlet two 23, a waste liquid outlet two 24, a flake alkali liquid inlet, and a stirring device two 26. The flake alkali adding device 22 is connected with the adjusting tank body 21; the waste liquid inlet two 23, the waste liquid outlet two 24, and the flake alkali liquid inlet are all connected with the acidification tank body 21, and the stirring device two 26 is arranged on the adjusting tank body 21.

[0045] The flake alkali adding device 22 comprises a storage alkali tank 221, an alkali liquid transfer tank 222, an alkali liquid transfer conveying pipe 223, a transfer pump 224, a backflow pipe 225, an alkali adding pipe 226, and an alkali adding metering device 227. The storage alkali tank 221 is connected with the alkali liquid transfer tank 222 through the alkali liquid transfer conveying pipe 223, the transfer pump 224 is arranged on the alkali liquid transfer conveying pipe 223, the backflow pipe 225 connects the alkali liquid transfer tank 222 and the storage alkali tank 221, the alkali adding pipe 226 connects the alkali liquid transfer tank 222 and the adjusting tank body 21, and the alkali adding metering device 227 is arranged on the alkali adding pipe 226.

[0046] The evaporator 4 is an MVR evaporator, comprising an evaporator body 41, a compressor 42 and a heater 43.

[0047] The lithium carbonate production waste liquid treatment device has the following beneficial effects:

[0048] The acidification tank 1, the PH adjusting tank 2 and the evaporator 4 are used to treat the waste liquid after lithium precipitation of lithium carbonate, and after acidification, PH adjustment and evaporation crystallization, the neutralization precipitate and the crystalline substance are removed, the concentrated recovery liquid is obtained, the waste is utilized, and the environmental pollution is reduced. Firstly, the lithium carbonate centrifugal waste liquid is acidified by the acidification tank 1, and then the acidified lithium carbonate waste liquid is adjusted by the PH adjusting tank 2, and the neutralization precipitate is formed. The primary crystalline substance in the PH-adjusted lithium carbonate waste liquid is removed by the filter press 3, and the PH-adjusted lithium carbonate waste liquid is concentrated and crystallized by the evaporator 4. The crystallization tank 5 cools the hot solution in the evaporator 4 to recrystallize. The centrifugal machine 6 removes anhydrous sodium sulfate in the waste liquid. The concentrated liquid treatment device 7 is provided with a phosphoric acid adding device, and the lithium ions in the waste liquid react with phosphoric acid to synthesize lithium phosphate with recycling value. The new evaporator and the like can realize efficient treatment of the waste liquid and reduce energy consumption.

[0049] The above is the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A lithium carbonate production waste liquid treatment device characterized by, The acidification tank (1), the PH adjusting tank (2) and the evaporator (4) are connected in sequence. The acidification tank (1) acidifies the lithium carbonate centrifugal waste liquid; the acidification tank (1) comprises an acidification tank body (11) and a sulfuric acid adding device (12), and the sulfuric acid adding device (12) is connected with the acidification tank body (11). The PH adjusting tank (2) adjusts the PH of the acidified lithium carbonate waste liquid; the PH adjusting tank (2) comprises an adjusting tank body (21) and a caustic soda adding device (22), and the caustic soda adding device (22) is connected with the adjusting tank body (21). The evaporator (4) concentrates and crystallizes the PH adjusted lithium carbonate waste liquid.

2. The lithium carbonate production waste liquid treatment device according to claim 1, characterized by, The acidification tank (1) further comprises a waste liquid inlet one (13), an acidification liquid inlet (14), a stirring device one (15) and a waste liquid outlet one (16), the waste liquid inlet one (13), the waste liquid outlet one (16) and the acidification liquid inlet (14) are connected with the acidification tank body (11), and the stirring device one (15) is arranged on the acidification tank body (11).

3. The lithium carbonate production waste liquid treatment device according to claim 1, characterized by, The sulfuric acid adding device (12) comprises a sulfuric acid tank (121), a medicine extraction branch (122), a medicine adding metering pump (123), an intermediate buffer chamber (124), a medicine adding branch (125), a medicine adding valve (126) and a medicine extraction valve (127), the sulfuric acid tank (121) is connected with the intermediate buffer chamber (124) through the medicine extraction branch (122), the medicine extraction valve (127) is arranged on the medicine extraction branch (122), the intermediate buffer chamber (124) is connected with the acidification tank body (11) through the medicine adding branch (125), and the medicine adding valve (126) is arranged on the medicine adding branch (125).

4. The lithium carbonate production waste liquid treatment device according to claim 3, characterized by, The sulfuric acid adding device (12) further comprises a backflow branch (128), a backflow metering pump (129) and a backflow valve (120), the backflow branch (128) connects the intermediate buffer chamber (124) and the sulfuric acid tank (121), and the backflow metering pump (129) and the backflow valve (120) are arranged on the backflow branch (128).

5. The lithium carbonate production waste liquid treatment device according to claim 1, characterized by, The PH adjusting tank (2) further comprises a waste liquid inlet two (23), a waste liquid outlet two (24), a caustic soda liquid inlet and a stirring device two (26), the waste liquid inlet two (23), the waste liquid outlet two (24) and the caustic soda liquid inlet are connected with the acidification tank body (11), and the stirring device two (26) is arranged on the adjusting tank body (21).

6. The lithium carbonate production waste liquid treatment device according to claim 1, characterized by, The slice alkali adding device (22) comprises a storage alkali tank (221), an alkali solution transfer tank (222), an alkali solution transfer conveying pipe (223), a transfer pump (224), a backflow pipe (225), an alkali adding pipe (226) and an alkali adding meter (227), the storage alkali tank (221) is connected with the alkali solution transfer tank (222) through the alkali solution transfer conveying pipe (223), the transfer pump (224) is arranged on the alkali solution transfer conveying pipe (223), the backflow pipe (225) connects the alkali solution transfer tank (222) and the storage alkali tank (221), the alkali adding pipe (226) connects the alkali solution transfer tank (222) and the adjusting groove body (21), and the alkali adding meter (227) is arranged on the alkali adding pipe (226).

7. The lithium carbonate production waste liquid treatment device according to claim 1, characterized by, The evaporator (4) is an MVR evaporator, comprising an evaporator body (41), a compressor (42) and a heater (43), the evaporator body (41) concentrates and crystallizes the PH-adjusted lithium carbonate waste liquid, the heater (43) provides heat energy for the evaporator body (41), and the compressor (42) compresses the steam of the evaporator body (41) to the heater (43) to provide heat energy.

8. The lithium carbonate production waste liquid treatment device according to claim 1, characterized by, Further comprising a filter press (3), which is arranged between the PH adjusting groove (2) and the evaporator (4) and comprises a pressing mechanism (31) and a filtering mechanism (32), and the pressing mechanism (31) presses the filtering mechanism (32).

9. The lithium carbonate production waste liquid treatment device according to claim 1, characterized by, Further comprising a crystallization tank (5) and a centrifugal machine (6), the crystallization tank (5) is arranged at the rear end of the evaporator (4), and the centrifugal machine (6) is arranged at the rear end of the crystallization tank (5).

10. The lithium carbonate production waste liquid treatment device according to claim 9, characterized by, Further comprising a concentrated liquid treatment device (7), which is arranged at the rear end of the centrifugal machine (6), and the concentrated liquid treatment device (7) is provided with a phosphoric acid adding device.

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