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Magnetic lithium ion sieve and method for preparing same

An ion sieve and magnetic technology, which is applied in the field of lithium extraction, can solve problems such as affecting the formation of spinel, being easily oxidized, and affecting production, and achieves the effects of reducing dissolution loss, easy large-scale production, and reducing manganese dissolution loss

Active Publication Date: 2017-02-15
衢州永正锂业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the ferroferric oxide magnetic core of the magnetic lithium ion sieve produced in this way is likely to be directly oxidized due to the probability of direct contact with the acidic environment, and after multiple acid activations, the dissolution rate of iron will be greatly reduced after the manganese is dissolved to a certain extent. increase, thereby affecting production, and at the same time, the solution background in the process of synthesizing ferroferric oxide is mixed with the solution background of synthesizing lithium manganese spinel, which affects the formation of spinel

Method used

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  • Magnetic lithium ion sieve and method for preparing same

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Embodiment 1

[0037] Prepare 1 ton of magnetic manganese dioxide ion sieve, add 0.5 g / l concentration of urea as a dispersion system, and add 0.17-0.18 t of ferrous chloride and 0.26-0.27 t of sulfurous acid at a molar ratio of 1:1.5 under the condition of 500 rpm stirring Iron solution, then slowly add 10% ammonia water 900-1000 L ammonia solution through a peristaltic pump until the solution pH=7.0, the black precipitate is ferroferric oxide magnetic core, and its average particle size is 20±3 nm. The above mixed solution is pumped into a φ300 mm slurry electromagnetic separator, which is filled with a stainless steel rhombic mesh as a high gradient medium. The magnetic component is ferroferric oxide magnetic core, which is washed by air-water mixed pulse, and the ferroferric oxide magnetic core is pumped into the silicon-coated mixing tank. The non-magnetic liquid phase component is unreacted ammonia water, which is directly returned to the stirring tank. barrel, this reflux process can ...

Embodiment 2

[0042] Embodiment 2: extract lithium from brine:

[0043] A certain brine contains lithium 0.3g / l, magnesium 100g / l, potassium 0.6g / l, sodium 1.3g / l, brine pH=5.0-5.3, add 10g / l magnetic manganese dioxide to the brine delivery pipeline Ion sieve, use sodium hydroxide to adjust the brine pH>5.0, and then use a 1.25m diameter slurry electromagnetic machine for magnetic separation, with a magnetic field strength of 1.3T, and a diamond-shaped media mesh for high gradient media. The above-mentioned magnetic separation can realize the treatment capacity of 300 tons of brine per hour. The magnetic separation process integrates three process steps: ion sieve capture, ion sieve cleaning in the magnetic field, and desorption liquid elution outside the magnetic field, as follows: After magnetic separation, the non-magnetic liquid phase component is brine after lithium extraction, which can be directly discharged; The magnetic part, that is, the magnetic ion sieve is trapped on the surfa...

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Abstract

The invention discloses a magnetic lithium ion sieve and a method for preparing the same. The magnetic lithium ion sieve which is a magnetic manganese dioxide lithium ion sieve is characterized in that silicon dioxide inertia layers are coated on the surfaces of tri-iron tetroxide magnetic cores with the particle sizes smaller than or equal to 50 nanometers, then lithium and manganese spinel is generated on the surfaces of silicon dioxide, and the nanometer magnetic manganese lithium ion sieve can be ultimately generated; a molar ratio of silicon elements to iron elements is 1:1-1:5, a molar ratio of the iron elements to manganese elements ranges from 1:1 to 1:30, saturation mass magnetic moment is higher than 5 emu / g, and the saturation lithium adsorption capacity is higher than 5 mg / g. The magnetic lithium ion sieve and the method have the advantages that the lithium and manganese spinel can be crystallized on the surfaces of inertia materials and can grow on the surfaces of the inertia materials, crystallization interfaces can be provided for the lithium and manganese spinel in a hydrothermal reaction kettle, accordingly, the crystallization speed of the lithium and manganese spinel can be increased, the crystallization integrity of the lithium and manganese spinel can be improved, and solution loss of manganese in use and regeneration procedures of the magnetic lithium ion sieve can be reduced to a great extent; lithium can be fully reused by the aid of synthesis processes, and accordingly the preparation cost of the magnetic lithium ion sieve can be lowered to a great extent.

Description

technical field [0001] The invention belongs to the technical field of lithium extraction, and relates to a magnetic lithium ion sieve and a preparation method thereof. Background technique [0002] Lithium is recognized as "the energy metal that promotes the progress of the world", and lithium batteries are widely used in home appliances such as mobile phones and computers. With the increase of human demand for clean energy and the growth of low-cost lithium salt production, lithium energy will profoundly affect human life. [0003] Lithium in nature is mainly abundant in pegmatite, salt lake brine, sea water, geothermal water and other deposits. The lithium resources that have been mined and utilized are mainly pegmatites and salt lakes, especially salt lake lithium resources. Lithium reserves in seawater are about 2.6×10 11 t is more than 10,000 times the total amount of terrestrial lithium resources. Therefore, research on lithium extraction technology from seawater,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/06B01J20/30C22B26/12
CPCB01J20/041B01J20/06B01J20/28009C22B26/12Y02P10/20
Inventor 马仲英
Owner 衢州永正锂业科技有限公司
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