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Pollution-free preparation method of ceric sulfate

A cerium sulfate, pollution-free technology, applied in chemical instruments and methods, rare earth metal sulfates, inorganic chemistry, etc., can solve the problems of increased pollution, safety and hidden dangers of concentrated sulfuric acid, and achieves high purity and utilization. Mass production, short time effect

Inactive Publication Date: 2018-05-01
CHANGZHOU GEOQUIN NANO NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method first involves ammonium ions, which will lead to pollution during the generation process; secondly, the method needs to use the strong oxidizing properties of concentrated sulfuric acid to convert trivalent cerium into positive tetravalent, and the use of concentrated sulfuric acid has potential safety hazards. Also increased pollution; The ceric sulfate that this method obtains has low purity, impurity content height in addition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dissolve 20,000g of cerium chloride crystals in 72.6L of deionized water, and dropwise add 217.8L of 0.8mol / L sodium hydroxide solution to it. After fully reacting, it is aged, and after vacuum filtration, the filter cake is placed in a 70-degree Celsius Fully stir in pure water, vacuum filter again, quickly add the obtained filter cake into 45.4L of dilute sulfuric acid with a solute mass fraction of 60%, heat to 80 degrees Celsius until the filter cake is completely dissolved, cool and crystallize and vacuum filter, filter The cake is vacuum-dried at 50 degrees centigrade to obtain orange-yellow high-quality ceric sulfate. After testing, the purity of the ceric sulfate in the orange-yellow product is 99.5 wt%.

Embodiment 2

[0016] Dissolve 20,000g of cerium chloride crystals in 72.6L of deionized water, and dropwise add 180L of 1mol / L potassium hydroxide solution to it, age after full reaction, vacuum filter and put the filter cake into pure water at 80 degrees Celsius Fully stir in the medium, vacuum filter again, quickly add the obtained filter cake into 60L of dilute sulfuric acid with a solute mass fraction of 45%, heat to 80 degrees Celsius until the filter cake is completely dissolved, cool and crystallize and vacuum filter, the filter cake passes through 60 The orange-yellow high-quality ceric sulfate was obtained by vacuum drying at 100°C. After testing, the purity of the ceric sulfate in the orange-yellow product was 99.2wt%.

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Abstract

The invention belongs to the field of preparation of inorganic chemistry, in particular to a pollution-free preparation method of ceric sulfate. The preparation method comprises the following steps: dissolving cerium chloride crystals in deionized water; adding strong alkali into the mixture; after full reaction, carrying out aging, suction filtration and cleaning; adding the obtained filter cakesinto dilute sulfuric acid; heating the mixture to react till the filter cakes are fully dissolved; carrying out cooling, crystallizing and suction filtration; and filtering the filter cakes to obtainsaffron yellow high quality ceric sulfate.

Description

technical field [0001] The invention belongs to the field of inorganic chemical preparation, in particular to a pollution-free preparation method of ceric sulfate. Background technique [0002] High-grade pure ceric sulfate is widely used in the electronics industry. The main preparation method currently used is precipitation with ammonia water and redissolving in concentrated sulfuric acid to generate ceric sulfate. The method first involves ammonium ions, which will lead to pollution during the generation process; secondly, the method needs to use the strong oxidizing properties of concentrated sulfuric acid to convert trivalent cerium into positive tetravalent, and the use of concentrated sulfuric acid has potential safety hazards. Also increased pollution; The ceric sulfate that this method obtains has low purity, impurity content height in addition. Contents of the invention [0003] The invention provides a pollution-free preparation method of ceric sulfate: [000...

Claims

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Application Information

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IPC IPC(8): C01F17/00
CPCC01F17/282C01P2006/80
Inventor 王鹭
Owner CHANGZHOU GEOQUIN NANO NEW MATERIALS
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