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Method for separating carbonate from carbonate bittern containing lithium and potassium to prepare sylvinite ore and lithium carbonate concentrate

A carbonate type, potassium rock salt mine technology, applied in the direction of lithium carbonate;/acid carbonate, alkali metal chloride, etc., can solve the problem of long production cycle, unfavorable potassium recycling, low lithium carbonate content and other problems, to achieve the effect of easy control, continuous industrialization and automatic production, and continuous and stable production.

Inactive Publication Date: 2013-04-24
TIBET XUSHENG MINING DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art has the following defects: 1. the concentrated brine lithium ion concentration obtained by the prior art is not high, generally 1.5g / l~2.8g / l; g / l~2.8g / l is reduced to 1.04g / l, and the yield of one-time lithium extraction process is low; ③In the process of drying ore in salt fields, potassium is precipitated in the form of potassium mirabilite, which is not conducive to the recovery and utilization of potassium in the later stage; ④Utilization The one-time production cycle of the solar pond is long, and crystallization in the solar pond is unfavorable for realizing continuous industrialization and automatic production; mine

Method used

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  • Method for separating carbonate from carbonate bittern containing lithium and potassium to prepare sylvinite ore and lithium carbonate concentrate
  • Method for separating carbonate from carbonate bittern containing lithium and potassium to prepare sylvinite ore and lithium carbonate concentrate
  • Method for separating carbonate from carbonate bittern containing lithium and potassium to prepare sylvinite ore and lithium carbonate concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Take 600kg of raw brine from Dangxiong Co Salt Lake (see Table 13 for the chemical composition of the brine), the lithium content in the original brine is 0.32g / l, evaporate to a brine density of 1.21g / ml, and a lithium content of 0.76g / l to prepare Get 140.01kg of pre-dried brine. Evaporate until the brine has a density of 1.26g / ml and a lithium content of 0.94g / l to obtain 116.037kg of pre-dried brine, whose chemical composition (unit: g / L) is shown in Table 2.

[0038] Table 2: Chemical composition of pre-dried brine

[0039]

[0040] Table 13: Dangxiong Co Salt Lake brine chemical composition (sampling time: 2012.3.28, analysis time: 2012.4.1)

[0041]

Embodiment 2

[0042] Example 2: Divide 140.01 kg of pre-dried brine with a density of 1.21 g / ml into 2 parts, each 70 kg. The 116.037kg pre-sunned brine with a density of 1.26g / ml was divided into 3 parts of 38.679kg each for freezing alkali, and the hydration of sodium carbonate and sodium sulfate was frozen at -5°C, -15°C, and -25°C respectively For mixed salt, its quantity is shown in Table 3, and its chemical composition is shown in Table 4;

[0043] product number k + Na + CL - SO 4 2- CO 3 2- B 2 o 3 Li + Pre 1 25.40 123.6 163.7 14.76 23.597 6.766 0.76 pre 2 27.10 125.4 165.6 16.21 28.844 8.575 0.940 Nitrate 1 1.192 35.745 6.130 37.423 19.127 0.101 0.041 Nitrate 2 1.598 36.850 3.787 26.477 28.670 2.560 0.044 Nitrine 3 1.364 36.874 19.070 22.910 18.166 1.462 0.018 Nitrine 4 1.494 37.544 19.799 13.353 23.451 4.133 0.043 Nitrine 5 2.682 36.641 22.299 12.723 21.589 3.883 ...

Embodiment 3

[0057] Embodiment 3: 31.854 kg of bittern after desulfurization and carbonate radicals are introduced into the sodium chloride pond to naturally evaporate and separate out 3.921 kg of halite, and its chemical dry basis composition is (unit %) shown in Table 7: obtain potassium saturated bittern 16.917 kg simultaneously, At this time, the potassium ion content in the brine is 51.700 g / L, and its chemical composition (unit g / L) is shown in Table VII.

[0058] Material name k + Na + CL - SO 4 2- CO 3 2- B 2 o 3 Li + Precipitated halite 0.973 38.576 60.011 0.028 0.000 0.160 0.034 Potassium saturated brine 51.700 97.660 189.900 1.500 　0.00 8.510 1.810

[0059] Embodiment 3 is a sodium chloride sun-drying process: generally, sodium chloride is separated out by natural evaporation and crystallization, and sodium chloride is separated;

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Abstract

The invention discloses a method for separating carbonate from carbonate bittern containing lithium and potassium to prepare sylvinite ore and lithium carbonate concentrate, wherein the carbonate bittern containing lithium and potassium is pre-concentrated, the carbonate is separated from the carbonate bittern containing lithium and potassium by means of combination of frozen alkaline and a precipitant so as to prepare the concentrated bittern with the content of carbonate reduced, then the concentrated bittern is further concentrated, the sylvinite ore separated out by evaporative crystallization is separately collected and prepared after the content of the potassium ion in the bittern is up to 51.70g / L, the lithium enrichment bittern with the content of the lithium ion being 4-26g / L is prepared, and the lithium enrichment bittern is guided into a crystallizer, added with sodium carbonate, and separated in a centrifugal way to obtain the lithium carbonate concentrate. Compared with the prior art, the method provided by the invention has the following advantages: the lithium enrichment concentration is increased because the carbonate in the bittern is removed; the purity of the obtained lithium carbonate and the overall recovery of the lithium ion are high; continuous industrialization and automated production of the preparation of the lithium carbonate concentrate can be implemented; high-grade sylvinite can be prepared from a salt pan, and the potassium ion recovery of the salt pan is increased; and the residual bittern of which the lithium is extracted can be comprehensively developed conveniently so as to further extract substances like boron, rubidium, cesium bromine.

Description

technical field [0001] The invention relates to a method for extracting inorganic salts, in particular to carbonate-type Li-containing + 、K + 、Na + / Cl - , CO 3 2- , SO 4 2- 、HCO 3 - , B 4 o 3 2- A method for extracting potassium halite and lithium carbonate concentrate from brine. Background technique [0002] Lithium metal (Li) is an important rare metal. It is an energy upstart in the 21st century and a high-precision material for industrial manufacturing. It mainly occurs in terrestrial hard rock, salt lake brine, and seawater. Lithium and lithium salt products are widely used in modern industry, especially in high-tech fields. The rapid development of China's economy is inseparable from the support of energy. The development and utilization of clean solar energy is one of the development trends in the field of energy utilization. The utilization of solar energy It is also inseparable from the development of lithium resources. Due to the non-renewability of...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01D3/04
Inventor 刘传福张青运丁振华杨泽喜鮑黎明苑海清王浩任久春冯万成
Owner TIBET XUSHENG MINING DEV
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