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Method for producing chromium oxide green by using plaster

A chromium oxide green and stucco technology, applied in the direction of chromium trioxide, chromium oxide/hydrate, etc., can solve the problems of high production cost of chromic anhydride, limited application range, low product content, etc., and achieve reduced production cost and good demonstration function, the effect of protecting the environment

Active Publication Date: 2012-08-08
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are two methods for domestic production of chromium oxide green. One is to convert chromic anhydride directly into chromium trioxide by roasting at high temperature. In ceramic color glazes and composite pigments, the production cost of direct use of chromic anhydride is high; the second is to mix sodium red alum with various additives at high temperature for roasting, washing, drying, and crushing. The content of products produced by this method is low, and the product The impurity content in chromium is relatively high, although the hexavalent chromium is low, but because of the low content, the scope of use is limited. The chromium oxide green produced by these two methods is limited in scope of use due to the influence of product quality, especially in ceramic pigments. and polishing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix stucco: ammonium sulfate: sulfur according to the ratio of mass ratio = 100:20:5, and then place it in the muffle furnace. Set the temperature of the high-temperature furnace to 1000°C, and take out the clinker after roasting at this temperature for 30 minutes. After cooling, the clinker is beaten and filtered with 2 times the amount of hot water, and then washed evenly with 2 times the amount of hot water. The temperature of beating water and washing water is 65°C. After washing, the filter cake is dried, and then ground and crushed to obtain the chromium oxide green product. Test results:

[0020] project content% Water soluble content% PH value Particle size (D50)um hue result 99.80 0.23 6.45 0.82 blue

Embodiment 2

[0022] Mix stucco: ammonium sulfate: sulfur according to the ratio of mass ratio = 100:20:5, and then place it in the muffle furnace. The set temperature is 1100°C, and the clinker is taken out after roasting at this temperature for 40 minutes. After cooling, the clinker is beaten and filtered with 2 times the amount of hot water, and then washed evenly with 5 times the amount of hot water. The temperature of beating water and washing water is 65°C. After washing, the filter cake is dried, and then ground and crushed to obtain the chromium oxide green product. Test results:

[0023] project Chromium oxide green content% Water soluble content% pH value Particle size (D50)um hue result 99.85 0.20 6.55 0.75 blue

Embodiment 3

[0025] Mix stucco: ammonium sulfate: sulfur according to the ratio of mass ratio = 100:20:5, and then place it in the muffle furnace. Set the temperature to 1200°C, and take it out after roasting at this temperature for 60 minutes. After cooling, the clinker is beaten and filtered with 2 times the amount of hot water, and then washed evenly with 3 times the amount of hot water. The temperature of beating water and washing water is 65°C. After washing, the filter cake is dried, and then ground and crushed to obtain the chromium oxide green product. Test results:

[0026] project Chromium oxide green content% Water soluble content% pH value Particle size (D50)um hue result 99.81 0.20 6.55 0.81 blue

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Abstract

The invention discloses a method for producing chromium oxide green by using chromium sulfate basic. The method comprises the steps of mixing chromium sulfate basic, ammonium sulfate and sulfur in certain proportions, roasting for 30-60min at temperature being 1000-1200 DEG C, washing with water, drying and crushing to obtain ultrafine chromium oxide green products with concentrated particle size. By adopting the method to produce the chromium oxide green, not only can chromic anhydride leftovers and wastes be utilized and can the production cost be reduced, but also a very good demonstration effect is taken in the aspect of environmental protection. Moreover, the particle size of the produced chromium oxide green is concentrated, the chromium oxide green is obviously finer than chromium oxide green which is produced by adopting the traditional process and the chromium oxide green is more suitable for application to ceramic pigment and the polishing field. By converting low-added-value chromium sulfate basic into high-added-value chromium oxide green, an effect of protecting the environment is taken at the same time and a very good demonstration effect is taken in the chromium salt production field. Besides, the goals of economy and environmental protection are achieved.

Description

technical field [0001] The invention belongs to the field of inorganic salt chromium salt production, and in particular relates to a method for producing chromium oxide green by using plaster. Background technique [0002] At present, there are two methods for domestic production of chromium oxide green. One is to convert chromic anhydride directly into chromium trioxide by roasting at high temperature. In ceramic color glazes and composite pigments, the production cost of direct use of chromic anhydride is high; the second is to mix sodium red alum with various additives at high temperature for roasting, washing, drying, and crushing. The content of products produced by this method is low, and the product The impurity content in chromium is relatively high, although the hexavalent chromium is low, but because of the low content, the scope of use is limited. The chromium oxide green produced by these two methods is limited in scope of use due to the influence of product qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/033
Inventor 张忠元毛雪琴谢希智
Owner GANSU JINSHI CHEM
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