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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.

Active Publication Date: 2012-04-11
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of preparation method of hydrated chromium oxide green, to solve the obtained pigment performance that traditional emerald chrome green pigment preparation method is not high enough, hiding power is weak, oil absorption is small, pigment brightness is low, water soluble matter is high, contains The problem of trace amounts of hexavalent chromium

Method used

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  • Preparation method of hydrated chromium oxide green
  • Preparation method of hydrated chromium oxide green
  • Preparation method of hydrated chromium oxide green

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Ingredients

[0026] Weigh 20g of chromic anhydride (CrO 3 ≥99.5%), boric acid 80g (H 3 BO 3 ≥99%), urea 3g (H 2 NCONH 2 ≥99%), aluminum hydroxide 16g (Al(OH) 3 ≥98.5%), mix well;

[0027] (2) Roasting

[0028] Put it into a rotary kiln that has been heated to 750°C, heat-preserve and roast for 1 hour to obtain 46g of clinker;

[0029] (3) Boiling slurry

[0030] Pour 230g of boric acid saturated solution, boil at 92°C for 1 hour, and filter to obtain 68g of wet base filter cake;

[0031] (4) washing

[0032] Pour the wet-based filter cake into 102ml of water, boil at 92°C for 0.5 hours, and filter, then pour the obtained wet-based filter cake into 102ml of water again, boil at 92°C for 0.5 hours;

[0033] (5) drying

[0034] The obtained substance was dried at 75° C. for 2 hours to obtain 18 g of hydrated chromium oxide green.

[0035] The test results are shown in the table below:

[0036] Test items Hiding power g / m 2 Oil absorption g / ...

Embodiment 2

[0038] (1) Ingredients

[0039] Weigh 20g of chromic anhydride (CrO 3 ≥99.5%), boric acid 70g (H 3 BO 3 ≥99%), urea 2.5g (H 2 NCONH 2 ≥99%), aluminum hydroxide 14g (Al(OH) 3 ≥98.5%), mix well;

[0040] (2) Roasting

[0041] Put it into a resistance furnace that has been heated up to 900°C, and heat-preserve and roast for 0.5 hours to obtain 45g of clinker;

[0042] (3) Boiling slurry

[0043] Pour 270g of boric acid saturated solution, boil at 100°C for 1 hour, and filter to obtain 66g of wet-base filter cake;

[0044] (4) washing

[0045] Pour the wet base filter cake into 132ml of water, boil and slurry at 100°C for 0.5 hours, filter, pour the obtained wet base filter cake into 132ml of water again, boil and slurry at 100°C for 0.5 hours; pour the obtained wet base filter cake into 132ml of water again, Boil and slurry for 0.5 hours;

[0046] (5) drying

[0047] The obtained substance was dried at 80° C. for 3 hours to obtain 19.86 g of hydrated chromium oxide gr...

Embodiment 3

[0051] (1) Ingredients

[0052] Weigh 20g of chromic anhydride (CrO 3 ≥99.5%), boric acid 80g (H 3 BO 3 ≥99%), urea 2.5g (H 2 NCONH 2 ≥99%), aluminum hydroxide 16g (Al(OH) 3 ≥98.5%), mix well;

[0053] (2) Roasting

[0054] Put it into a resistance furnace that has been heated up to 850°C, heat-preserve and roast for 1 hour to obtain 45g of clinker;

[0055] (3) Boiling slurry

[0056] Pour 270g of boric acid saturated solution, boil at 96°C for 1 hour, and filter to obtain 65g of wet cake;

[0057] (4) washing

[0058] Pour the wet-based filter cake into 130ml of water, boil and slurry at 96°C for 1 hour, filter, and pour the obtained wet-based filter cake into 130ml of water again, and boil and slurry for 1 hour;

[0059] (5) drying

[0060] The obtained substance was dried at 80° C. for 3 hours to obtain 18 g of hydrated chromium oxide green.

[0061] The test results are shown in the table below:

[0062] Test items Hiding power g / m 2 Oil absorp...

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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.

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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Application Information

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IPC IPC(8): C01G37/033
Inventor 张忠元毛雪琴朱丹武平谢希智张大波
Owner GANSU JINSHI CHEM
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