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Production method of high-purity cadmium sulfate 8/3-hydrate

A production method, the technology of cadmium sulfate, is applied in the field of production of high-purity cadmium sulfate 8/3 hydrate, which can solve the problems of hidden safety and environmental protection, large amount of hydrogen generation, and low production efficiency, so as to achieve low production cost and high production efficiency. The effect of high rate and high production efficiency

Pending Publication Date: 2021-10-19
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of industrialization, this method not only has low production efficiency, complicated process and high cost, but also produces a large amount of hydrogen, which has potential safety and environmental protection risks, and the yield and purity of the produced products need to be further improved.

Method used

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  • Production method of high-purity cadmium sulfate 8/3-hydrate
  • Production method of high-purity cadmium sulfate 8/3-hydrate

Examples

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Effect test

Embodiment 1

[0029] The preparation method of eight-thirds cadmium sulfate hydrate comprises the steps:

[0030] (1) Take 2.6L of water, put it into a beaker, slowly add 540ml of analytically pure sulfuric acid (98%), stir, and then add cadmium oxide in batches, a total of 1.275kg, the molar ratio of cadmium oxide to sulfuric acid is 1.02:1.00, React for 3 hours, control the pH value of the reaction end point to 2.5-3 by adding sulfuric acid, filter with suction, and then evaporate at 90°C until the specific gravity is 1.62g / mL;

[0031] (2) After cooling to room temperature, mix the two according to the volume ratio of cadmium sulfate solution: ethanol at 1:1, mix at room temperature and under ventilation, stir with an explosion-proof motor, stir for 0.5 hours and then centrifuge at a medium speed for 1 hour to obtain the mother liquor The medium alcohol is recycled under reduced pressure, and the obtained crystals are aired in a ventilated place for 8 hours at a temperature of 28°C and a...

Embodiment 2

[0034] The preparation method of eight-thirds cadmium sulfate hydrate comprises the steps:

[0035] (1) Take 2.7L of water, put it into a beaker, slowly add 540ml of analytically pure sulfuric acid (98%), stir, and then add cadmium oxide in batches, a total of 1.315kg, the molar ratio of cadmium oxide to sulfuric acid is 1.05:1.00, React for 10 hours, the pH value at the end of the reaction is 3.5-4, filter with suction, and then evaporate at 110°C until the specific gravity is 1.65g / mL;

[0036] (2) After cooling to normal temperature, mix the two according to the volume ratio of cadmium sulfate solution and ethanol as 1:1.5, mix them at room temperature and under ventilation, stir with an explosion-proof motor, stir for 0.1 hour and then centrifuge at medium speed for 0.5 hour, and the mother liquor Medium alcohol is recycled under reduced pressure distillation, and the crystal is dried in a ventilated place for 12 to 16 hours at a temperature of 25°C and a relative humidity...

Embodiment 3

[0039] The preparation method of eight-thirds cadmium sulfate hydrate comprises the steps:

[0040] (1) Take 2.65L of water, put it into a beaker, slowly add 540ml of analytically pure sulfuric acid (98%), stir, then add cadmium oxide in batches, a total of 1.369kg, the molar ratio of cadmium oxide to sulfuric acid is 1.09:1.00, React for 7 hours, the pH at the end of the reaction is 4.5-5, filter with suction, and then evaporate at 100°C until the specific gravity is 1.7g / mL;

[0041] (2) After cooling to normal temperature, mix the two according to the volume ratio of cadmium sulfate solution and ethanol as 1:0.8, mix them at room temperature and under ventilation, stir with an explosion-proof motor, stir for 1 hour and then centrifuge at medium speed for 2 hours, and the mother liquor The medium alcohol is recycled under reduced pressure, and the obtained crystals are aired in a ventilated place for 36 hours at a temperature of 30°C and a relative humidity of 60% to obtain ...

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Abstract

The invention discloses a production method of high-purity cadmium sulfate 8 / 3-hydrate, which comprises the following steps: dissolving cadmium oxide in a sulfuric acid solution to obtain a cadmium sulfate solution, then adjusting the pH value to 2-5, conducting filtering, and evaporating the filtrate until the specific gravity is 1.6-1.7 g / mL; and adding an organic solvent alcohol or ethyl acetate or diethyl ether into the evaporated filtrate, conducting stirring and extracting, conducting centrifuging after extracting, and airing crystals obtained by centrifuging to obtain cadmium sulfate 8 / 3-hydrate. The production method is high in production efficiency, simple in process step, low in cost, safe and environmentally friendly, and the prepared octa / 3 cadmium sulfate hydrate product is high in yield and purity and suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of chemical products, in particular to a production method of high-purity eight-thirds hydrated cadmium sulfate. Background technique [0002] Cadmium sulfate eight-thirds hydrate (3CdSO 4 ·8H 2 O) is an unstable hydrate of cadmium sulfate. Soluble in water, almost insoluble in alcohol and ethyl acetate and ether. Since the solubility of cadmium sulfate melt is not sensitive to temperature, and crystallization and dissolution will not change due to temperature changes, it can be used to prepare standard battery cadmium. In addition, it is widely used in chemical analysis, electroplating, and batteries. [0003] The current traditional method uses metallic cadmium as a raw material, uses nitric acid as an oxidant, adjusts the acidity to dissolve by sulfuric acid, and reacts, uses cadmium nitrate to remove ferric ions, then filters, acidifies, evaporates to dryness, burns, and adds water after cooling. D...

Claims

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Application Information

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IPC IPC(8): C01G11/00
CPCC01G11/003C01P2006/80
Inventor 张佳王波
Owner FIRST RARE MATERIALS CO LTD
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