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Production method of high-grade pigment chromium oxide green

A chromium oxide green and production method technology, applied in the field of metallurgy and chemical industry, can solve the problems of inconvenient industrial feeding, inability to realize large-scale industrial production, high moisture content of materials, etc., and achieve benefits for large-scale industrial production, broad market prospects and profits The effect of simple space and production process

Active Publication Date: 2018-10-19
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the application of this method in industrial production is that, on the one hand, the wet-mixed materials are not uniform, and the difference in industrial production is large; The material is easy to agglomerate, which is not convenient for industrialized feeding, so large-scale industrialized production cannot be realized

Method used

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  • Production method of high-grade pigment chromium oxide green
  • Production method of high-grade pigment chromium oxide green
  • Production method of high-grade pigment chromium oxide green

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of production method of high-end pigment chromium oxide green in the present embodiment comprises the following steps:

[0026] S1. Dissolve 1 ton of sodium dichromate and 0.35 ton of ammonium sulfate to 2m at 20°C 3 In tap water, stir and dissolve to form a saturated mother liquor;

[0027] S2. Raise the temperature of the saturated mother liquor obtained in step S1 to 90° C., and form an unsaturated mother liquor as the temperature rises, and add 1 ton of sodium dichromate and 0.35 tons of industrial ammonium sulfate again under stirring, and stir for 30 minutes;

[0028] S3. Turn on the cooling and cooling device, and re-cool the material finally obtained in step S2 to 20°C. With the cooling of the temperature, the solubility of the material decreases again, and crystals are precipitated in the saturated mother liquor to form a crystalline material;

[0029] S4. Put the crystalline material formed in step S3 into a centrifuge for crystallization and separatio...

Embodiment 2

[0036] A kind of production method of high-end pigment chromium oxide green in the present embodiment comprises the following steps:

[0037] S1, re-enter the mother liquor recovered in Example 1 into the reaction vessel, at this moment, the mother liquor is still the material-saturated mother liquor at 20°C;

[0038] S2. The temperature of the saturated mother liquor of the material is raised to 90°C, and an unsaturated mother liquor is formed as the temperature rises, and 1 ton of sodium dichromate and 0.35 tons of industrial ammonium sulfate are added again under stirring, and the reaction is stirred for 30 minutes;

[0039] S3. Turn on the cooling and cooling device, and re-cool the material finally obtained in step S2 to 20°C. With the cooling of the temperature, the solubility of the material decreases again, and crystals are precipitated in the saturated mother liquor to form a crystalline material;

[0040] S4. Put the crystalline material formed in step S3 into a cent...

Embodiment 3

[0049] A kind of production method of high-end pigment chromium oxide green in the present embodiment comprises the following steps:

[0050] S1. Dissolve 1 ton of sodium dichromate and 0.25 ton of ammonium carbonate at 20°C to 2m 3In tap water, stir and dissolve to form a saturated mother liquor;

[0051] S2. The temperature of the saturated mother liquor obtained in step S1 is raised to 90°C, and an unsaturated mother liquor is formed as the temperature rises, and 1 ton of sodium dichromate and 0.25 tons of industrial ammonium carbonate are added under stirring again, and the reaction is stirred for 30 minutes;

[0052] S3. Turn on the cooling and cooling device, and re-cool the material finally obtained in step S2 to 20°C. With the cooling of the temperature, the solubility of the material decreases again, and crystals are precipitated in the saturated mother liquor to form a crystalline material;

[0053] S4. Put the crystalline material formed in step S3 into a centrifug...

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Abstract

The invention discloses a production method f high-grade pigment chromium oxide green. According to the production method, sodium dichromate, ammonium sulfate (or ammonium carbonate) are taken as rawmaterials; crystallization technology is adopted to produce a ammonium dichromate and sodium sulfate (or sodium carbonate) mixed crystal, a roasting additive is added, high temperature roasting in a rotary kiln is carried out, and at last water washing impurity removing, drying, and crushing are carried out so as to obtain the chromium oxide green product. The beneficial effects are that: the uniformly reacted product is obtained through crystallization process, production and feeding are convenient; the production method is friendly to the environment, and no pollution is caused; the color ofthe obtained chromium oxide green product is more bright, colors close to yellow, close to green, and light color can be achieved, and product standards of Bayer company can be achieved, the productcan be used for replacing inported high-grade pigment chromium oxide green, the market prospect is promising, and the profit value is high.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a production method of high-end pigment chromium oxide green. Background technique [0002] Traditional chromium oxide green production processes generally include chromic anhydride thermal decomposition method and ammonium dichromate thermal decomposition method. The products are mainly used in the production fields of pigments, abrasives, refractory materials, and metal chromium. Products produced by thermal decomposition of chromic anhydride are generally used in the production of abrasives, refractory materials and metal chromium, and a small amount is used in the field of pigments. The chromium oxide produced by this method has a darker green tone and can be used in ordinary glaze and coloring production. The chromium oxide green product produced by ammonium dichromate thermal decomposition method has soft texture and good hue, but because ammonium ...

Claims

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Application Information

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IPC IPC(8): C01G37/02
CPCC01G37/02C01P2006/62C01P2006/63C01P2006/64C01P2006/80
Inventor 韩自玉毛正钊韩自玺朱紫张忠元李录星王永波陈荣谢希智
Owner GANSU JINSHI CHEM
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