Preparation method of hydrated chromium oxide green

A chromium oxide green and hydration technology, which is applied in the field of inorganic chromium salt pigments, can solve the problems of low pigment brightness, weak hiding power, and insufficient pigment performance, and achieve bright color, better vanadium removal effect, and high pigment brightness.
CN102408130AActive Publication Date: 2012-04-11GANSU JINSHI CHEM
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GANSU JINSHI CHEM
Publication Date
2012-04-11

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Abstract

The invention discloses a preparation method of hydrated chromium oxide green. The method comprises the steps of: mixing the raw materials of chromic anhydride and boric acid with the leavening agent urea uniformly, conducting roasting within a certain temperature range, boiling the obtained clinker in a boric acid solution for slurrying, carrying out filtration and subjecting the obtained substance to slurrying in boiling water, then performing filtration, washing and drying so as to obtain hydrated chromium oxide green. The hydrated chromium oxide green prepared by the method of the invention can be widely used in pigments, and also can be used as an adsorbent of sodium vanadate.
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Description

technical field

[0001] The invention belongs to the field of inorganic chromium salt pigments, in particular to a preparation method of hydrated chromium oxide green. Background technique

[0002] Hydrated chromium oxide green is also known as emerald chrome green, and its chemical formula is Cr 2 o 3 ·H 2 O can also be expressed as 2CrO·OH. The color is emerald green, belongs to the orthorhombic crystal system, and can be thermally decomposed into black powder in the temperature range of 480-550°C, and its crystal structure consists of CrO 2 and Cr 2 o 3 composition. The traditional emerald chrome green pigment preparation method is to carry out hydrothermal treatment of chromium hydroxide. The performance of the obtained pigment is not high enough, and the hiding power (37~45g / m 2 ) is weak, the oil absorption (15-25g / 100g) is small, the brightness of the pigment is low (10-25%) is not bright enough, the water-soluble matter is high (1.8-2.5%), and it contains trac...

Claims

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