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Method for controlling production of precipitation-method iron red mixed crystals

A technology for controlling precipitation and iron red, applied in iron oxide, iron oxide/iron hydroxide, color/spectral characteristic measurement, etc., can solve problems such as yellowish color, loss of iron red pigment performance, and inability to adjust oxidation condition parameters in time

Inactive Publication Date: 2013-10-09
南通宝聚颜料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A small amount of iron yellow miscellaneous crystals are produced in the initial stage of seed crystal preparation, and the miscellaneous crystals produced during the oxidation process gradually increase, and finally the color of the product is obviously yellowish, and the performance of the iron red pigment is lost
If the quality data of iron red seed crystals cannot be provided timely and accurately for production, the oxidation condition parameters cannot be adjusted in time in the later process, which will eventually lead to unqualified products

Method used

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  • Method for controlling production of precipitation-method iron red mixed crystals
  • Method for controlling production of precipitation-method iron red mixed crystals
  • Method for controlling production of precipitation-method iron red mixed crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 100ml of ferrous hydroxide precipitate with a ferrous iron concentration of 0.1mol / L at 20°C, add 0.05g of dispersant sodium phosphate, blow in air (flow rate 60L / h), react for 1h to obtain iron red seed crystals.

[0024] The iron red seed crystal samples were dried and ground under dark conditions at a temperature of 30°C. Weigh 10 g of dry potassium bromide, add 0.05 g of iron red seed crystal samples, grind, press, and scan to obtain an infrared spectrum of iron red seed crystal samples, and perform atmosphere compensation, baseline correction, and smoothing of the spectrum. By analyzing the infrared spectrum of the iron red seed sample, it is found that the wave number is 1127cm -1 , 945cm -1 The characteristic peak of iron red seed crystal appears at 791cm -1 , 899cm -1 There is no characteristic peak, indicating that there is no iron yellow impurity generated in the iron red seed crystal sample. The seed sample is a pure phase iron red seed crystal, which is of ...

Embodiment 2

[0027] Take 100ml of ferrous hydroxide precipitate with ferrous iron concentration of 0.1mol / L at 20°C, add 0.08g of dispersant stearic acid, blow in air (flow rate 60L / h), react for 1h to obtain iron red seed crystals.

[0028] The iron red seed crystal samples were dried and ground under dark conditions at a temperature of 30°C. Weigh 10 g of dry potassium bromide, add 0.05 g of iron red seed crystal sample, grind, press, and scan to obtain the infrared spectrum of the iron red seed crystal sample, and perform atmosphere compensation, baseline correction, and smoothing of the spectrum. By analyzing the infrared spectrum of the iron red seed sample, it is found that the wave number is 1127cm -1 , 945cm -1 The characteristic peak of iron red seed crystal appears at the place, and the wave number is 791cm -1 , 899cm -1 The characteristic peak of yellow iron mixed crystal appears at the place, but the intensity of the mixed crystal peak is smaller than the characteristic peak of iro...

Embodiment 3

[0031] Take 100ml of ferrous hydroxide precipitate with a ferrous iron concentration of 0.1mol / L at 20°C, add 0.05g of dispersant sodium phosphate, blow in air (flow rate 60L / h), react for 1h to obtain iron red seed crystals.

[0032] The iron red seed crystal samples were dried and ground under dark conditions at a temperature of 30°C. Weigh 10 g of dry potassium bromide, add 0.05 g of iron red seed crystal sample, grind, press, and scan to obtain the infrared spectrum of the iron red seed crystal sample, and perform atmosphere compensation, baseline correction, and smoothing of the spectrum. By analyzing the infrared spectrum of the iron red seed sample, it is found that the wave number is 1127cm -1 , 945cm -1 The characteristic peak of iron red seed crystal appears at the place, and the wave number is 791cm -1 , 899cm -1 The characteristic peak of yellow iron mixed crystal appears at the place, and the peak intensity of the mixed crystal peak is larger than the characteristic p...

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Abstract

The invention discloses a method for controlling production of precipitation-method iron red mixed crystals. The method comprises the following steps of: (1), quickly oxidizing ferrous hydroxide precipitate which is added with a dispersing agent by an oxidizing agent to prepare iron red seed crystals; (2), drying the iron red seed crystals, tabletting, scanning and processing to obtain an infrared spectrogram; (3), obtaining an iron red seed crystal characteristic peak position and an impurity characteristic peak position according to an IR (Infrared Radiation) absorption spectrum characteristic peak of oxyhydroxide of the iron, and judging the quality of the iron red seed crystal sample according to the strength of the impurity peak; and (4), carrying out two-step oxidization on the seed crystals according to the infrared analyzed result, carrying out infrared detection on the oxide product iron red to obtain an infrared spectrogram of the iron red, and judging the quality of the iron red according to the strength of the impurity peak.

Description

technical field [0001] The invention relates to a method for detecting the quality of iron red by infrared spectroscopy and controlling the generation of miscellaneous crystals, belonging to the technical field of production detection. Background technique [0002] Iron oxide has very good development prospects in traditional building materials, coatings, rubber, chemical catalysts, electronic telecommunications and other applications, as well as in fine chemicals, new materials, and functional materials. As the iron-based product with the largest output among iron oxide pigments, iron oxide red pigment is the second largest inorganic red pigment after titanium dioxide in production and sales. It is widely used in architectural coatings, plastics, rubber, ceramics, glass, papermaking, and inks. , art paint, medicine, cosmetics and other industries. [0003] As an inorganic color pigment, color, as one of the most important technical indicators of iron red, is also its most ...

Claims

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Application Information

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IPC IPC(8): C01G49/06G01N21/35
Inventor 尤亮菅盘铭屈庆文杨建明
Owner 南通宝聚颜料有限公司
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