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Environment-friendly synthesis method of pigment-grade iron oxide red

A technology for iron oxide red and green synthesis, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve environmental pollution and other problems, and achieve the effect of reducing production costs, low cost, and good pigment performance

Inactive Publication Date: 2011-07-20
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of green synthesis method of pigment grade iron oxide red, solve the NO produced in the prior art nitric acid method and mixed acid method to produce iron oxide red pigment process x The problem of environmental pollution caused by gas and ammonia nitrogen waste liquid

Method used

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  • Environment-friendly synthesis method of pigment-grade iron oxide red
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  • Environment-friendly synthesis method of pigment-grade iron oxide red

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Concentration of 2mol / L Fe(NO 3 ) 3 Solution 50ml, under stirring, use 6.0mol / L NaOH solution to adjust pH = 7, and at the same time, the volume of the resulting suspension is fixed to 200ml to obtain amorphous hydrated iron oxide seeds; transfer the seeds to the reaction In the kettle, the seed crystal concentration is 0.125mol / L, according to the added Fe 2+ The number of moles of ions in the reaction system and the Fe contained in the seed crystal in the reaction system 3+ The ratio of moles of ions is 0.05:1 and ferrous chloride (FeCl 2 ) catalyst, reacted for 0.5h, added 30g excess scrap iron sheet, introduced air, added waste liquid for producing titanium dioxide during the reaction, maintained the concentration of ferrous ions in the reaction system at 0.16mol / L, and maintained the temperature of the reaction system at 90 ℃, reacted for 48h, filtered the product, washed several times with water, and dried to obtain about 23g of the product.

Embodiment 2

[0022] Concentration of 2mol / L Fe(NO 3 ) 3 Solution 50ml, under stirring, use 6.0mol / L NaOH solution to adjust pH = 7, and at the same time, the volume of the resulting suspension is fixed to 200ml to obtain amorphous hydrated iron oxide seeds; transfer the seeds to the reaction In the kettle, the seed crystal concentration is 0.125mol / L, according to the added Fe 2+ The number of moles of ions in the reaction system and the Fe contained in the seed crystal in the reaction system 3+ The ratio of moles of ions is 0.05:1 and ferrous sulfate (FeSO 4 ) after the catalyzer, reacted for 0.5h, added 30g excess scrap iron sheet, passed into air, added ferrous salt (waste liquid for producing titanium dioxide) in the reaction process, maintained the concentration of ferrous ion in the reaction system to be 0.16mol / L, and reacted The temperature of the system was maintained at 90°C, and the reaction was carried out for 48 hours. The product was filtered, washed several times with wat...

Embodiment 3

[0024] Concentration of 2mol / L Fe(NO 3 ) 3 Solution 50ml, under stirring, use 6.0mol / L NaOH solution to adjust pH = 7, and at the same time, the volume of the resulting suspension is fixed to 200ml to obtain amorphous hydrated iron oxide seeds; transfer the seeds to the reaction In the kettle, the seed crystal concentration is 0.125mol / L, according to the added Fe 2+ The number of moles of ions in the reaction system and the Fe contained in the seed crystal in the reaction system 3+ The ratio of moles of ions is 0.05:1 and ferrous chloride (FeCl 2 ) after the catalyzer, reacted for 0.5h, added 30g excess scrap iron sheet, passed into air, added ferrous salt (waste liquid for producing titanium dioxide) in the reaction process, maintained the concentration of ferrous ion in the reaction system as 0.20mol / L, reacted The temperature of the system was maintained at 90°C, and the reaction was carried out for 48 hours. The product was filtered, washed several times with water, an...

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Abstract

The invention discloses an environment-friendly synthesis method of pigment-grade iron oxide red. The method comprises the following steps: by taking ferric salt or ferrous salt as a raw material, respectively regulating the pH to 7 and 9 so as to respectively prepare amorphous hydrated ferric oxide seed crystal and delta-FeOOH seed crystal; respectively adding the seed crystals in a reaction kettle, so that the concentrations of the seed crystals are 0.0125mol / L and 0.07mol / L respectively; respectively controlling the temperature to 90-95 DEG C and 90-100 DEG C; adding a Fe<2+> ion catalyst (a ferrous chloride solution or a ferrous sulfate solution) to react for 0.5 hour; adding 30g of excess waste scrap iron, introducing air, supplementing a ferrite solution in a reaction process, maintaining the concentration of ferrous ion in the reaction system to 0.16-0.20 mol / L, and reacting for 48-82 hours; and filtering, washing and drying the product so as to obtain the pigment-grade iron oxide red powder with a good pigment property. The environment-friendly synthesis method has no environment pollution and low raw material cost, and process condition is easy to control, thus an effective, practicable and environment-friendly novel method is provided for the industrial production of the pigment-grade iron oxide red.

Description

technical field [0001] The invention relates to a green synthesis method of pigment-grade iron oxide red, which belongs to the technical field of inorganic pigment preparation. Background technique [0002] Iron oxide red, as a traditional iron oxide industrial product, has a history of about 50 years in my country. Because of its high chemical and physical stability, as well as good performances such as color diversity, high hiding power and non-toxicity, it is widely used in rubber, paint, artificial marble colorants, as well as ceramics, paper, inks and Art paint and other industries. Pigment-grade iron oxide red products produced in my country account for 60%-70% of the world's total output, of which 50% are exported. Therefore, the continuous research and improvement of the iron oxide red pigment production process is more conducive to promoting the healthy, stable and lasting development of my country's iron oxide red pigment industry. In the prior art, the preparat...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 魏雨鲁彬赵丽艳
Owner HEBEI NORMAL UNIV
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