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Method for improving chromium oxide green color

A chromium oxide, green technology, applied in the direction of chromium oxide/hydrate, etc., can solve the problems of high roasting temperature, high energy consumption, complicated preparation method, etc., and achieve the effect of improving color, color saturation and reflection

Active Publication Date: 2021-01-01
GANSU JINSHI CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has high roasting temperature, high energy consumption, and strong raw material toxicity, and its preparation method is also relatively complicated.

Method used

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  • Method for improving chromium oxide green color
  • Method for improving chromium oxide green color
  • Method for improving chromium oxide green color

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The present embodiment provides a method for improving the green color of chromium oxide, said method comprising the following steps:

[0066] Mix 1000g of sodium dichromate, 161g of sulfur, 20g of urea, 18g of cornstarch and 12g of boric acid and place them in an electric heating roaster, and pass through 1.0m 3 The air was roasted at 1000°C for 2 hours. During the roasting process, the concentration of oxygen in the roasting tail gas was controlled to be 15vol.%. After slurry washing, suction filtration, drying and ball milling, the chromium oxide green product is obtained.

[0067] In the present embodiment, the prepared chromium oxide green product is subjected to SEM characterization, and its SEM image is as follows figure 1 Shown; The particle size distribution figure of described chromium oxide green product is as figure 2 shown.

[0068] Depend on figure 1 It can be seen that the particle size of the chromium oxide green product is uniform, and the grain si...

Embodiment 2

[0071] The present embodiment provides a method for improving the green color of chromium oxide, said method comprising the following steps:

[0072] Mix 500kg of sodium dichromate, 375kg of ammonium sulfate and 35kg of cassava starch and place them in a rotary roasting kiln, passing through a 41.5m 3 Oxygen was roasted at 900°C for 2 hours. During the roasting process, the concentration of oxygen in the roasting tail gas was controlled to be 13vol.%. The solid product obtained after roasting was cooled to 300°C with the furnace, and then poured into 2250L of water, and then passed through slurry After chemical washing, centrifugal separation, drying and jet crushing, the chromium oxide green product is obtained.

Embodiment 3

[0074] The present embodiment provides a method for improving the green color of chromium oxide, said method comprising the following steps:

[0075] Mix 1000g of potassium dichromate, 140g of sulfur and 18g of ammonium sulfate, place them in an electric heating roaster, and pass through 0.023m3 Oxygen was roasted at 950°C for 1.5h. During the roasting process, the concentration of oxygen in the exhaust gas was controlled to be 12vol.%, and the solid product obtained after roasting was cooled to 300°C with the furnace, and then poured into 4.5L of water. The chromium oxide green product is obtained after slurry washing, plate-and-frame filter pressing, drying, and mill grinding.

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Abstract

The invention provides a method for improving the green color of chromium oxide, which comprises the following steps: mixing dichromate with a reducing agent, roasting in an oxidizing atmosphere to obtain roasted tail gas and a chromium oxide green product, and controlling the concentration of oxygen in the roasted tail gas to be not lower than 11vol.% in the roasting process. The method disclosedby the invention is based on a production process for preparing chromium oxide green by a dichromate reduction method, and a high-performance pigment-grade chromium oxide green product can be obtained by further controlling a roasting atmosphere; the method provided by the invention is simple to operate, does not influence the equipment productivity, has small influence on the production cost, isbeneficial to industrial large-scale production, and has good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for improving the green luster of chromium oxide. Background technique [0002] Chromium oxide green is an important industrial raw material, which has the advantages of good stability, acid and alkali resistance, high temperature resistance, light and weather resistance, etc. It can be used in paints, coatings, inks, plastics, rubber, chemical fibers, textiles, ceramics, glass, cement, etc. fields, as well as cosmetics, tapes, food, adhesives, xerographic copying, etc. The unique color of chromium oxide green, which is similar to plant chlorophyll, can be used to prepare camouflage materials similar to green leaf clusters, and has also been used in camouflage coatings for weapons. With the growth of the global economy, the market demand for high-performance pigment-grade chromium oxide green products is increasing year by year, and the quality ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/02
CPCC01G37/02C01P2004/03C01P2002/60C01P2004/61C01P2004/52C01P2006/62C01P2006/63C01P2006/64C01P2004/62Y02P10/20
Inventor 雒敏婷张忠元张红玲谢希智张笛陈荣周鹏孔红侠徐红彬
Owner GANSU JINSHI CHEM
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