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Device and method for preparing lithium carbonate from brine by utilizing solar energy

A technology of lithium carbonate and solar energy, applied in the direction of lithium carbonate;/acid carbonate, energy input, etc., can solve the problems of limited promotion of lithium extraction from brine and comprehensive utilization technology, limited production efficiency, etc., and achieve production efficiency High, obvious energy-saving advantages, and the effect of reducing costs

Active Publication Date: 2012-05-09
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the process of lithium extraction, in order to save energy and reduce the requirements for infrastructure, natural beach drying, evaporation and crystallization are mostly used, and then chemical precipitation is used to analyze lithium. The improvement of production efficiency is severely restricted, and the promotion of lithium extraction from brine and comprehensive utilization technology is also limited. Therefore, it is particularly important to seek a simple, efficient and energy-saving lithium carbonate production technology.

Method used

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  • Device and method for preparing lithium carbonate from brine by utilizing solar energy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Sulfate-type brine with a magnesium-lithium ratio of 60 is used as raw material, the composition of the raw brine is shown in Table 1, and the density is 1.11g / cm 3 .

[0025] Table 1 Composition of raw brine (g / L)

[0026] Na +

K +

Li +

Ca 2+

Mg 2+

Cl -

SO 4 2-

15.778

2.376

0.047

0.087

2.840

23.749

5.205

[0027] The working process and operation method of the device for producing lithium carbonate from brine using solar energy are as follows.

[0028] a) feeding the brine into the first solar heat collector, and heating the brine to 70° C. with solar heat;

[0029] b) The heated brine enters the membrane still, and the membrane still uses hydrophobic polypropylene microporous membrane elements for direct contact operation. The brine is separated into fresh water and concentrated brine with higher salt content through the membrane distillation process. The fresh wate...

Embodiment 2

[0037] The raw material brine composition and device are the same as in Example 1, and the work flow and operation method are as follows.

[0038] a) feeding the brine into the first solar heat collector, and heating the brine to 60° C. with solar heat;

[0039] b) The heated brine enters the membrane still, and the membrane still adopts hydrophobic polypropylene microporous membrane elements and operates in vacuum mode. The brine is separated into fresh water and concentrated brine with higher salt content through the membrane distillation process. The fresh water enters the salt scrubber, and the concentrated brine whose temperature drops to 40°C is sent to the second solar collector; the concentration ratio is controlled during the membrane distillation process. Around 1.6, no solid-phase salt was precipitated during the whole process;

[0040] c) In the second solar heat collector, after the concentrated brine is heated to 60°C, it is then sent to the triple-effect evapor...

Embodiment 3

[0047] Raw material brine composition, device and work flow are identical with embodiment 1, and difference is that the first crystallizer adds Na 2 CO 3 Before the precipitant, add Na to the first crystallizer in sequence 2 SO 4 and Ca(OH) 2 , forming a MgCO containing 3 , Mg(OH) 2 and CaSO 4 2H 2 O's salt slurry.

[0048] Li obtained in this example 2 CO 3 In the product, Li 2 CO 3 The mass content reached 75.96%, and the Li yield in the whole process reached 89.63%, which took 55 hours (including crystallization aging time).

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Abstract

The invention provides a device and a method for preparing lithium carbonate from brine by utilizing solar energy, belonging to the technical field of comprehensive utilization of brine. The device for preparing the lithium carbonate comprises a solar heat collector, a film distillation apparatus, a triple effect evaporator, a crystallizer, a salt washer and the like. The method for preparing thelithium carbonate comprises the following steps: evaporating and concentrating the brine by a film distillation method by using solar energy as the heat source, carrying out enforced evaporation and crystallization on the brine by triple effect evaporation to separate out various inorganic salts containing sodium, potassium and magnesium, and finally carrying out chemical precipitation to obtain the lithium carbonate product. The invention has the advantages of simple process route, high efficiency in the production process and obvious energy-saving effect, and can also obtain various inorganic salt products by fractional extraction while obtaining the lithium carbonate product, thereby realizing the comprehensive utilization of resources.

Description

technical field [0001] The invention relates to comprehensive utilization of brine, in particular to a device and method for preparing lithium carbonate from brine by using solar energy. Background technique [0002] Lithium and lithium compounds are widely used in energy, aerospace, metallurgy, ceramics and other fields, and are of great significance to the development of my country's national economy. Among lithium and lithium compounds, lithium carbonate is the basic material for the production of lithium metal and lithium salts. Other industrial lithium products are downstream products of lithium carbonate. Therefore, lithium carbonate is the most critical raw material in the lithium industry. However, due to the limited production capacity in our country, much of the lithium carbonate needed is imported, which seriously restricts the development of the domestic lithium industry. [0003] Seawater and salt lake brine contain abundant lithium resources. my country's lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08
CPCY02P20/133
Inventor 王旭明程芳琴成怀刚赵仲鹤赵劲
Owner SHANXI UNIV
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