Two-step oxidation production method for iron oxide red pigment

A technology for iron oxide red and pigment, which is applied in the field of two-step oxidation to produce iron oxide red pigment, can solve the problems of high production cost of iron oxide red pigment, secondary environmental pollution and potential safety hazard, etc., and achieves easy availability of raw materials and uniform particle size. , good separation effect

Active Publication Date: 2013-03-20
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned process solves the problems of high production cost of iron oxide red pigment, secondary pollution to the environment and great pote

Method used

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  • Two-step oxidation production method for iron oxide red pigment

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Embodiment 1

[0031] The present embodiment prepares iron oxide red pigment by the following method:

[0032] A method for producing iron oxide red pigment by two-step oxidation, comprising the following steps:

[0033] Step 1, using α-FeOOH as the seed crystal, putting the seed crystal and water into the oxidation tank, the seed crystal input amount is 50% of the total amount of ferrous sulfate in the subsequent step 2.

[0034] Step 2: Use a small amount of sulfuric acid to adjust the pH value of the solution in the oxidation tank to 4, and raise the temperature to 70-73°C, add ferrous sulfate to the solution in the oxidation tank, so that the concentration of ferrous sulfate in the solution is 35g / L , then drop into seed crystal to the solution in the oxidation barrel, the seed crystal input amount is 10% of the consumption of the ferrous sulfate used in the step 2; The consumption of the ferrous sulfate in the step 2 is 600kg.

[0035] Step 3. Continuously feed oxygen into the solution...

Embodiment 2

[0040] A method for producing iron oxide red pigment by two-step oxidation, comprising the following steps:

[0041] Step 1, using α-FeOOH as the crystal seed, put the seed crystal and water into the oxidation barrel, the seed crystal input amount is 52% of the total amount of ferrous sulfate in the subsequent step 2, and the mass ratio of the seed crystal to water is 1 :7.

[0042] Step 2: Use a small amount of sulfuric acid to adjust the pH value of the solution in the oxidation tank to 4, and raise the temperature to 70-73°C, add ferrous sulfate to the solution in the oxidation tank, so that the concentration of ferrous sulfate in the solution is 38g / L , then drop into crystal seed to the solution in the oxidation barrel, the seed crystal input amount is 18% of the consumption of the ferrous sulfate used in the step 2; The consumption of the ferrous sulfate in the step 2 is 750kg.

[0043] Step 3. Continuously feed oxygen into the solution in the oxidation barrel obtained ...

Embodiment 3

[0048] A method for producing iron oxide red pigment by two-step oxidation, comprising the following steps:

[0049] Step 1, using α-FeOOH as the seed crystal, putting the seed crystal and water into the oxidation barrel, the seed crystal input amount is 55% of the total amount of ferrous sulfate in the subsequent step 2.

[0050] Step 2: Use a small amount of sulfuric acid to adjust the pH value of the solution in the oxidation tank to 4, and raise the temperature to 70-73°C, add ferrous sulfate to the solution in the oxidation tank, so that the concentration of ferrous sulfate in the solution is 34g / L , then drop into crystal seed to the solution in the oxidation barrel, the seed crystal input amount is 10~20% of the consumption of the ferrous sulfate used in the step 2; The consumption of the ferrous sulfate in the step 2 is 800kg.

[0051] Step 3: Continuously feed oxygen into the solution in the oxidation barrel obtained in step 2 for oxidation, keep the temperature of th...

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Abstract

The invention discloses a two-step oxidation production method for an iron oxide red pigment. According to the method, alpha-FeOOH is used as a seed crystal, a calcium mineral salt is used as a neutralizer in reaction process, and a byproduct obtained in preparation of titanium dioxide, i.e., ferrous sulfate, is used as a raw material; through accurate control of the reaction process, the iron oxide red pigment and a gypsum particle with different particle sizes are finally obtained, a good separation effect on the iron oxide red pigment and the gypsum particle is obtained, and the content of Fe2O3 in a final product is more than 99%; moreover, the particle size of the iron oxide red pigment is at a nanometer level and in a range of 100 to 200 nm, and granularity of the iron oxide red pigment is uniform. The method provided by the invention overcomes the problems of high production cost, secondary pollution to the environment, great potential safety hazards and the like in production of the iron oxide red pigment by using traditional methods; the byproduct ferrous sulfate obtained in preparation of titanium dioxide is utilized, and the raw material is easily available.

Description

technical field [0001] The invention relates to a production method of iron oxide red pigment, in particular to a method for producing iron oxide red pigment by two-step oxidation. Background technique [0002] Iron oxide red pigment is a very important inorganic color pigment with unique physical and chemical properties and excellent pigment performance. It is widely used in coatings, building materials (ceramics, colored bricks, colored tiles, colored cement products) plastics and other industries. There are many process routes, and the current commonly used method is a liquid-phase ammonia method in which ferrous salt is used as a raw material and industrial ammonia is used as an oxidation neutralizer. However, this method requires the use of industrial ammonia, which has brought three problems: high cost; the wastewater contains ammonia nitrogen, which is difficult to completely treat and cause secondary pollution; industrial ammonia is a hazardous chemical that is toxic...

Claims

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Application Information

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IPC IPC(8): C01G49/06B82Y30/00
Inventor 黄德文
Owner CNMC GUANGXI PGMA
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