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

A carbonate-type and sulfate-type technology, applied in the direction of lithium carbonate;/acid carbonate, magnesium carbonate, etc., can solve problems such as production difficulties, low solubility of lithium carbonate, and high solubility of lithium carbonate

Active Publication Date: 2012-06-13
陈兆华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the process of extracting lithium carbonate from carbonate-type lithium-containing brine, the enrichment of lithium in brine is a difficult problem, because the solubility of lithium carbonate is very small, and it is inverse solubility. According to the enrichment of lithium in brine by Tibet Salt Lake Data, the saturated content of lithium in summer brine is about 1.5g / l, and the saturated content of lithium in winter brine is about 2.5g / l, that is, the natural evaporation in summer is large, which is conducive to production, and the solubility of lithium carbonate is small. In the severe cold season, when it is not conducive to production, the solubility of lithium carbonate is high, and the solar pool commonly used in industry has brought great difficulties to production.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a producing method for preparing lithium carbonate by taking carbonate type brine and sulphate type brine as raw material and by repeatedly mixing brine. Firstly carbonate type brine and sulphate type brine are mixed for performing the first brine mixing, so as to ensure that CO3<2-> ion and Mg<2+> ion in the mixed brine are completely reacted to produce basic magnesium carbonate, brine is evaporated and concentrated, and solid and liquid are separated, so that basic magnesium carbonate precipitate is removed, and lithium enrichment brine is obtained; and then the lithium enrichment brine and carbonate type brine, the lithium ion concentration of which is evaporated and concentrated to be saturated or nearly saturated, are mixed for performing second brine mixing, so that Li+ ion in the mixed brine produces lithium carbonate, solid and liquid are separated, lithium carbonate precipitate is removed, and the lithium carbonate precipitate is washed with hot water and dried, so that lithium carbonate products are obtained. Besides electricity, the method basically does not require foreign material, the investment is less, the technology is simple, the method can be applied to the mass production of lithium carbonate, the acquisition rate is high, the product quality meets the national standard, and the method is particularly suitable for the development of lithium resources of saline lake in Tibet.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01F5/24
Inventor 陈兆华陈默
Owner 陈兆华
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