Preparation method of low-arsenicred iron oxide pigment

A technology of iron oxide red and pigments, which is applied in the field of preparation of low-arsenic iron oxide red pigments, can solve the problems that the content cannot be effectively controlled, the product performance is not ideal, the consumption of iron non-renewable resources, etc., and achieve good color covering power, particle size Exquisite and delicate, the effect of saving iron resources

Active Publication Date: 2012-04-18
ZHEJIANG HUAYUAN PIGMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of low-arsenic iron oxide red pigment is generally produced by iron sheet selection method. In the whole production process, iron sheet participates in the reaction, which not only consumes iron, a non-renewable resource, but also produces products in terms of fineness and product performance. Neither is ideal, such as the content of toxic heavy metals arsenic (As) and lead (Pb) cannot be effectively controlled
In addition, it is inevitable that there will be dirty, messy and poor phenomena in the production process.

Method used

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  • Preparation method of low-arsenicred iron oxide pigment
  • Preparation method of low-arsenicred iron oxide pigment
  • Preparation method of low-arsenicred iron oxide pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 The production method of described iron oxide red pigment as shown comprises seed crystal preparation and two-step oxidation, and process step is as follows:

[0034] i) seed crystal preparation,

[0035] a) Put 650Kg low-arsenic iron sheet into the high-pressure barrel, and add appropriate amount of water;

[0036] b) warming up to 70°C and injecting 1000kg parts by weight of dilute nitric acid with a content of 40%;

[0037] c) React at a pressure of 0.35Mpa, keep the pressure for 15min, open the vent valve, drop to a pressure of 0.1-0.2Mpa, and transport it to the seed storage tank.

[0038] ii) Ferrous nitrate preparation part

[0039] d) Put the iron sheet in a long reaction tank, and react with dilute nitric acid at a long temperature (≤60° C.) to generate ferrous nitrate and ammonium nitrate. The concentration after the reaction is 10.8%, and the pH value is 3.0.

[0040] iv) ferrous sulfate preparation part

[0041] e) dissolving the solid fer...

Embodiment 2

[0047] like figure 1 As shown, the production method of the iron oxide red pigment includes seed crystal preparation and two-step oxidation, and the process steps are as follows:

[0048] i) Seed crystal preparation

[0049]a) Put 680Kg low-arsenic iron sheet into the high-pressure barrel, and add appropriate amount of water;

[0050] b) warming to 70°C and injecting 1250kg parts by weight of dilute nitric acid with a content of 40%;

[0051] c) React at a pressure of 0.40Mpa, keep the pressure for 15min, open the vent valve, drop to a pressure of 0.1-0.2Mpa, and transport to the seed storage tank.

[0052] ii) Ferrous nitrate preparation part

[0053] d) Put the iron sheet in a long reaction tank, and react with dilute nitric acid at a long temperature (≤60° C.) to generate ferrous nitrate and ammonium nitrate. The concentration after the reaction is 11.7%, and the pH value is 3.2.

[0054] iv) ferrous sulfate preparation part

[0055] E) be that the solid ferrous sulfat...

Embodiment 3

[0062] like figure 1 As shown, the production method of the iron oxide red pigment includes seed crystal preparation and two-step oxidation, and the process steps are as follows:

[0063] i) seed crystal preparation,

[0064] a) Put 750Kg low-arsenic iron sheet into the high-pressure barrel, and add appropriate amount of water;

[0065] b) flushing temperature to 70 ℃ and injecting 1380kg parts by weight of dilute nitric acid with a content of 40%'

[0066] c) React at a pressure of 0.45Mpa, keep the pressure for 15min, open the vent valve, drop to a pressure of 0.1-0.2Mpa, and transport to the seed storage tank.

[0067] ii) Ferrous nitrate preparation part

[0068] d) Put the iron sheet in a long reaction tank, and react with dilute nitric acid at a long temperature (≤60° C.) to generate ferrous nitrate and ammonium nitrate. The concentration after the reaction is 13.5%, and the pH value is 3.6.

[0069] iv) ferrous sulfate preparation part

[0070] e) dissolving the so...

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Abstract

The invention relates to a preparation method of an organic pigment, in particular to a preparation method of a low-arsenicred iron oxide pigment. the method produces a low-arsenicred iron oxide pigment by a two-step oxidation liquid-phase production method and does not use sheet iron in two-step oxidation, thereby reducing the consumption of sheet iron resources and obtaining iron red with better fineness and dispersion than those of iron red produced by a sheet iron mixed acid method. Because the sheet iron is not used in the two-step oxidation, the contents of heavy metals, such as arsenic, lead, and the like can be effectively controlled. The low-arsenicred iron oxide pigment prepared by the method contains As not more than 5 mg / kg and Pb not more than 10 mg / kg. The invention can be widely applied to industries, such as pencils, toys, cosmetics, medicine, tipping paper, and the like.

Description

technical field [0001] The invention relates to a low-arsenic iron oxide red pigment and a production method thereof, which can be widely used in the pharmaceutical industry, such as manufacturers of pencils, toys, cosmetics, medicines, and tipping paper. Background technique [0002] Low arsenic iron oxide red pigment, its chemical name: ferric oxide, chemical formula: Fe 2 o 3 , is an important raw material for the production of pencils, toys, cosmetics, medicine, and tipping paper. At present, the production of low-arsenic iron oxide red pigment is generally produced by iron sheet selection method. In the whole production process, iron sheet participates in the reaction, which not only consumes iron, a non-renewable resource, but also produces products in terms of fineness and product performance. Not ideal enough, as the content of toxic heavy metals arsenic (As) and lead (Pb) cannot be effectively controlled. In addition, it is inevitable that there will be dirty, ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06
Inventor 竺增林冯阿荣李金花廖金华倪亚娟房双泉王华英
Owner ZHEJIANG HUAYUAN PIGMENT CO LTD
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