Producing method for preparing lithium carbonate by taking carbonate type brine and sulphate type brine as raw material and by repeatedly mixing brine

Abstract

Provided is a method for the production of lithium carbonate by applying multi-bittern-adding method, and using carbonate type bittern and sulfate type bittern( or magnesium-containing bittern) as raw material, which comprises applying the first bittern-adding step by mixing carbonate type bittern with sulfate type bittern, CO32- and Mg2+ ions in the bittern reacting with each other completely to produce basic magnesium carbonate, evaporating and concentrating the bittern, applying solid-liquid separation to remove the precipitation of basic magnesium carbonate, and to obtain lithium-enriched bittern; applying the second bittern-adding step by mixing the lithium-enriched bittern with carbonate type bittern which is evaporated and concentrated to a lithium ion saturation concentration or a concentration close to the lithium ion saturation concentration, so as to produce lithium carbonate by Li+ ion contained in the mixed bittern, applying solid-liquid separation to remove the precipitation of lithium carbonate, washing the obtained precipitation of lithium carbonate with hot water, drying, and then to obtain lithium carbonate product. The method is simple, the raw material can be easily obtained, and the yield is high.

Description

technical field

[0001] The invention belongs to the field of inorganic salt chemical industry, and in particular relates to a production method for producing lithium carbonate by using carbonate-type brine and sulfate-type brine as raw materials by overlapping and adding brine. Background technique

[0002] Lithium carbonate has extremely high value and broad market prospects. At present, there are many methods for preparing lithium salt from brine at home and abroad, mainly including:

[0003] 1. Brine-aluminate precipitation method;

[0004] 2. Organic solvent extraction;

[0005] 3. Ion sieve method (ion exchange, adsorption) (see "Sea Lake Salt and Chemical Industry", Volume 29, Issue 4, Pages 9-13);

[0006] 4. Evaporation and crystallization separation method;

[0007] 5. Precipitation method;

[0008] 6. Flotation method; (See "Sea Lake Salt and Chemical Industry", Volume 20, Issue 4, Pages 20-26; Volume 22, Issue 1, Pages 14-16. Volume 29, Issue 4, Issue 9 -13 p...

Examples

Embodiment 1

[0071] 1. Take the brine from Lake A in the Ngari area of ​​Tibet, the density d=1.0785, and the composition is as follows (g / l):

[0072] K + Mg 2+ Na + Li + SO 4 2- CO 3 2- Cl -

[0073] 2.29 0.29 43.51 0.17 1.188 2.50 364.19

[0074] When the brine is evaporated to a lithium ion content of 1.78 g / l, its composition is as follows:

[0075] K + Na + Li + SO 4 2- CO 3 2- Cl -

[0076] 23.85 107.953 1.78 12.375 18.52 166.177 (g / l)

[0077] Get this bittern 50L, set aside. The halogen is called A 1 .

[0078] 2. Take brine from Lake B in Ngari, Tibet, with density d=1.1, and the composition is as follows (g / l):

[0079] K + Mg 2+ Na + Li + SO 4 2- Cl -

[0080] 3.288 12.651 32.179 0.13 4.678 86.058

[0081] It is mixed with the brine of Lake A in a ratio of A: B = 94.6: 5.4 to be brine (the calculation basis for the ratio of brine is:

[0082] Magnesium ion: carbonate grou...

Embodiment 2

[0095] take A 1 7L brine, take B 1 Mix 2L of brine, stir and heat to 80°C, stir for a period of time, and filter while hot to obtain a clear liquid. The lithium ion content of the serum was 1.299g / l. After simple material balance calculation, B 1 The singlet precipitation rate of lithium brine is 83.76%, A 1 The single-line precipitation rate of lithium brine is 27.02%. The lithium carbonate precipitated in this example is a crude product, which can be obtained by backwashing and drying.

[0096] Note: The total acquisition rate of lithium: the leakage of brine in the salt pan caused by natural evaporation and the entrainment of other salts in the salt pan evaporation are unavoidable in any salt field production, and usually do not affect the calculation of the total production rate of the workshop. If According to the above routine, when calculating the total lithium acquisition rate in this process, except for running, escaping, dripping, and leaking in the production wo...

Embodiment 3

[0098] 1. Take the brine from Lake C in Ngari, Tibet, with a density of d=1.13, and the composition is as follows (g / l):

[0099] K + Mg 2+ Ca 2+ Na + Li + SO 4 2- CO 3 2- Cl -

[0100] 16.122 0.004 0.002 60.728 0.13 16.700 5.559 89.572

[0101] When the brine is evaporated to a lithium ion content of 1.78 g / l, its composition is as follows:

[0102] K + Na + Li + SO 4 2- CO 3 2- Cl -

[0103] 49.04 107.12 1.78 15.89 75.97 197.945 (g / l)

[0104] Take 5L of the brine and set aside. The halogen is called C 1 .

[0105] 2. Take the brine from Lake D in Ngari, Tibet, with a density of d=1.1275, and the composition is as follows (g / l):

[0106] K + Mg 2+ Ca 2+ Na + Li + SO 4 2- CO 3 2- Cl - HCO 3 -

[0107] 10.894 3.64 0.108 57.429 0.16 4.480 0.790 105.615 0.18

[0108] Mix with the brine of Lake A in the ratio C: D=60.1:39.9 and mix it with brine (the calcu...

technical field

[0001] The invention belongs to the field of inorganic salt chemical industry, and in particular relates to a production method for producing lithium carbonate by using carbonate-type brine and sulfate-type brine as raw materials by overlapping and adding brine. Background technique

[0002] Lithium carbonate has extremely high value and broad market prospects. At present, there are many methods for preparing lithium salt from brine at home and abroad, mainly including:

[0003] 1. Brine-aluminate precipitation method;

[0004] 2. Organic solvent extraction;

[0005] 3. Ion sieve method (ion exchange, adsorption) (see "Sea Lake Salt and Chemical Industry", Volume 29, Issue 4, Pages 9-13);

[0006] 4. Evaporation and crystallization separation method;

[0007] 5. Precipitation method;

[0008] 6. Flotation method; (See "Sea Lake Salt and Chemical Industry", Volume 20, Issue 4, Pages 20-26; Volume 22, Issue 1, Pages 14-16. Volume 29, Issue 4, Issue 9 -13 p...

Examples

Embodiment 1

[0071] 1. Take the brine from Lake A in the Ngari area of ​​Tibet, the density d=1.0785, and the composition is as follows (g / l):

[0072] K + Mg 2+ Na + Li + SO 4 2- CO 3 2- Cl -

[0073] 2.29 0.29 43.51 0.17 1.188 2.50 364.19

[0074] When the brine is evaporated to a lithium ion content of 1.78 g / l, its composition is as follows:

[0075] K + Na + Li + SO 4 2- CO 3 2- Cl -

[0076] 23.85 107.953 1.78 12.375 18.52 166.177 (g / l)

[0077] Get this bittern 50L, set aside. The halogen is called A 1 .

[0078] 2. Take brine from Lake B in Ngari, Tibet, with density d=1.1, and the composition is as follows (g / l):

[0079] K + Mg 2+ Na + Li + SO 4 2- Cl -

[0080] 3.288 12.651 32.179 0.13 4.678 86.058

[0081] It is mixed with the brine of Lake A in a ratio of A: B = 94.6: 5.4 to be brine (the calculation basis for the ratio of brine is:

[0082] Magnesium ion: carbonate grou...

Embodiment 2

[0095] take A 1 7L brine, take B 1 Mix 2L of brine, stir and heat to 80°C, stir for a period of time, and filter while hot to obtain a clear liquid. The lithium ion content of the serum was 1.299g / l. After simple material balance calculation, B 1 The singlet precipitation rate of lithium brine is 83.76%, A 1 The single-line precipitation rate of lithium brine is 27.02%. The lithium carbonate precipitated in this example is a crude product, which can be obtained by backwashing and drying.

[0096] Note: The total acquisition rate of lithium: the leakage of brine in the salt pan caused by natural evaporation and the entrainment of other salts in the salt pan evaporation are unavoidable in any salt field production, and usually do not affect the calculation of the total production rate of the workshop. If According to the above routine, when calculating the total lithium acquisition rate in this process, except for running, escaping, dripping, and leaking in the production wo...

Embodiment 3

[0098] 1. Take the brine from Lake C in Ngari, Tibet, with a density of d=1.13, and the composition is as follows (g / l):

[0099] K + Mg 2+ Ca 2+ Na + Li + SO 4 2- CO 3 2- Cl -

[0100] 16.122 0.004 0.002 60.728 0.13 16.700 5.559 89.572

[0101] When the brine is evaporated to a lithium ion content of 1.78 g / l, its composition is as follows:

[0102] K + Na + Li + SO 4 2- CO 3 2- Cl -

[0103] 49.04 107.12 1.78 15.89 75.97 197.945 (g / l)

[0104] Take 5L of the brine and set aside. The halogen is called C 1 .

[0105] 2. Take the brine from Lake D in Ngari, Tibet, with a density of d=1.1275, and the composition is as follows (g / l):

[0106] K + Mg 2+ Ca 2+ Na + Li + SO 4 2- CO 3 2- Cl - HCO 3 -

[0107] 10.894 3.64 0.108 57.429 0.16 4.480 0.790 105.615 0.18

[0108] Mix with the brine of Lake A in the ratio C: D=60.1:39.9 and mix it with brine (the calcu...

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