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A method for removing chloride ions in nano oxides by plate and frame filter press and water washing

A nano-oxide, plate-and-frame filter press technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, nanotechnology, etc. The effect of low production cost, simple process conditions and uniform particle distribution

Active Publication Date: 2019-12-17
CHANGZHOU GEOQUIN NANO NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The preparation of nano-rare earth oxides usually uses a suction filter bucket and a vacuum pump to filter and wash with water, but the time for suction and filtration is longer and the water is more, which directly leads to an increase in cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Carry out precipitation reaction: preparation concentration is the yttrium chloride feed liquid of 0.4mol / l, control the acidity of yttrium chloride feed liquid to be less than 0.3mol / l, be: 1:1.6 add carbonic acid according to the molar ratio of yttrium oxide and precipitation agent Sodium, the concentration of sodium carbonate solution is 0.5 mol / l, then add 2% dispersant PEG2000, add positive sedimentation dropwise, stir for 1 hour after the dropwise addition, turn off the stirring and age for 2 hours.

[0024] (2) Washing:

[0025] Use a pneumatic diaphragm pump to send the sediment in the reactor to the plate-and-frame filter press, which is filled with 40 plates in total. Using the separation effect of the filter cloth, and then through the pressure of the plate-and-frame filter press, the water is filtered and the slurry is retained. . The washing temperature of the plate and frame filter press is 50°C, and the pressure of the plate and frame filter press is...

Embodiment 2

[0030] (1) Precipitation reaction: prepare a cerium chloride feed solution with a concentration of 0.3mol / l, control the acidity of the cerium chloride feed solution to be less than 0.3mol / l, and add carbonic acid according to the molar ratio of cerium oxide and precipitant: 1:3 Sodium bicarbonate, the concentration of sodium bicarbonate solution is 0.5mol / l, then add 2.5% dispersant PEG2000, add positive sedimentation dropwise, stir for 1h after the dropwise addition, turn off the stirring and age for 2h.

[0031] (2) Washing:

[0032] Use a pneumatic diaphragm pump to send the sediment in the reactor to the plate-and-frame filter press, which is filled with 40 plates in total. Using the separation effect of the filter cloth, and then through the pressure of the plate-and-frame filter press, the water is filtered and the slurry is retained. .

[0033] The washing temperature of the plate and frame filter press is 55°C, and the pressure of the plate and frame filter press is ...

Embodiment 3

[0038] (1) Carry out precipitation reaction: preparation concentration is the yttrium chloride feed liquid of 0.5mol / l, control the acidity of yttrium chloride feed liquid to be less than 0.3mol / l, be: 1:1.6 add carbonic acid according to the molar ratio of yttrium oxide and precipitation agent Sodium, the concentration of sodium carbonate solution is 0.4 mol / l, then add 2% dispersant PEG2000, add the positive sedimentation dropwise, stir for 1 hour after the dropwise addition, turn off the stirring and age for 2 hours.

[0039] (2) Washing:

[0040]Use a pneumatic diaphragm pump to send the sediment in the reactor to the plate-and-frame filter press, which is filled with 40 plates in total. Using the separation effect of the filter cloth, and then through the pressure of the plate-and-frame filter press, the water is filtered and the slurry is retained. . The washing temperature of the plate and frame filter press is 60°C, and the pressure of the plate and frame filter press...

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PUM

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Abstract

The invention belongs to the technical field of preparation of rare-earth compounds, and particularly relates to a method for removing chlorine irons in nano oxide by plate-frame filter-pressing and washing. The method is characterized by comprising the following steps: adopting plate-frame filter pressing to perform solid-liquid separation for a rare-earth oxide prepared through a precipitation method, performing segmental washing on the plate frame for washing from front to rear; and washing simultaneously to remove the chlorine ions. The method has the advantages of being relatively simplein process condition, relatively low in production cost, liable to realize industrial production. The whole preparation process meets environment-friendly requirements. Content of the chlorine ions ofoxide obtained by the method is smaller than 20 ppm, onceprimary grain size is 30-70 nm, and particle distribution is uniform.

Description

technical field [0001] The invention belongs to the technical field of preparation of rare earth compounds, in particular to a method for removing chloride ions in nanometer oxides by plate and frame press filtration and water washing. Background technique [0002] Nano-rare earth oxides have good optical, electrical, magnetic, mechanical and chemical properties, and are widely used in functional ceramic materials, luminescent materials, laser materials and other fields. When it is applied to the above fields, it not only has strict requirements on the particle size of nano-rare earth oxide powder, but also has higher requirements on non-rare earth impurities. When nano-rare earth oxides are used in chip multilayer ceramic capacitors (MLCC) At the same time, in order to improve the brightness of the product, reduce dispersion, and prolong its life, it is generally required that the chloride ion content of nano-oxides be as low as possible, because the higher the chloride ion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00B82Y40/00
CPCB82Y40/00C01F17/206C01P2004/64C01P2006/80
Inventor 杨应亚巫亚军
Owner CHANGZHOU GEOQUIN NANO NEW MATERIALS