Method for producing black iron oxide by liquid phase synthesis

A kind of iron oxide black, uniform technology, applied in the field of liquid phase additive production of iron oxide black, can solve the problems of production cost reduction, environmental pollution, volatilization, etc., achieve the effects of efficient utilization, quality improvement, and chemical stability improvement

Pending Publication Date: 2021-12-10
YIXING YUXING IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Though the iron black quality that this method makes can reach national first-class product standard, production cost reduces to some extent, by-product (NH 4 ) 2 5O 4 It can be recycled as fertilizer, but it will inevitably cause the volatilization of free ammonia in the solution during the production process, so it

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1:

[0020] Add the 0.5% ferrous sulfate solution preheated to 70°C into the reaction kettle, keep the temperature at 70-95°C, and let in 25M air. 3 Under the condition of / min, add NaOH solution, ferrous sulfate and sodium hydroxide undergo an addition reaction to generate ferric oxide. After the reaction is completed, stop stirring, and the ferric oxide settles and accumulates at the bottom of the reactor. After the sedimentation is completed Remove the supernatant, keep the generated ferric oxide in the reaction kettle, continue to add 0.5% ferrous sulfate solution preheated to 70 ° C into the reaction kettle, add NaOH solution, and let air 25M 3 / min, and continue to generate ferric tetroxide under the condition of keeping the temperature at 70-95 °C. In this way, in a reactor, the reaction generates ferric oxide-ferric oxide sedimentation-removal of supernatant for 3 cycles, collects the precipitate and cleans it, and then passes through conventional press...

Example Embodiment

[0021] Example 2:

[0022] Add the 0.5% ferrous sulfate solution preheated to 70°C into the reaction kettle, keep the temperature at 80-95°C, and let in the air for 30M. 3 Under the condition of / min, add NaOH solution, ferrous sulfate and sodium hydroxide undergo an addition reaction to generate ferric oxide. After the reaction is completed, stop stirring, and the ferric oxide settles and accumulates at the bottom of the reactor. After the sedimentation is completed Remove the supernatant, keep the generated ferric tetroxide in the reaction kettle, continue to add 0.5% ferrous sulfate solution preheated to 70 ° C into the reaction kettle, add NaOH solution, and pass air at a rate of 30M 3 / min, and continue to generate ferric tetroxide under the condition of keeping the temperature at 70-95 °C. In this way, in a reactor, the reaction generates ferric oxide-ferric oxide sedimentation-removal of supernatant for 5 times, collects the precipitate and cleans it, and then passes t...

Example Embodiment

[0023] Example 3:

[0024] Add the 0.5% ferrous sulfate solution preheated to 70°C into the reaction kettle, keep the temperature at 80-95°C, and let in the air for 30M. 3 Under the condition of / min, add NaOH solution, ferrous sulfate and sodium hydroxide undergo an addition reaction to generate ferric oxide. After the reaction is completed, stop stirring, and the ferric oxide settles and accumulates at the bottom of the reactor. After the sedimentation is completed Remove the supernatant, keep the generated ferric tetroxide in the reaction kettle, continue to add 0.5% ferrous sulfate solution preheated to 70 ° C into the reaction kettle, add NaOH solution, and pass air at a rate of 30M 3 / min, and continue to generate ferric tetroxide under the condition of keeping the temperature at 70-95 °C. In this way, in a reaction kettle, the reaction generates ferric oxide-ferric oxide sedimentation-removal of supernatant for 8 cycles, collects the precipitate and cleans it, and then...

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PUM

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Abstract

The invention discloses a method for producing blackiron oxide by liquid phase synthesis, and belongs to the technical field of iron oxide pigment production. The method mainly comprises the following steps: producing a plurality of batches of iron oxide black in the same reaction kettle, and reserving the iron oxide black generated in the previous batch every time as a crystal nucleus generated in the next batch of iron oxide black. A specific method for producing each batch of iron oxide black comprises the following steps: preheating a ferrous sulfate solution and alkali liquor, adding the preheated ferrous sulfate solution and alkali liquor into a reaction kettle, keeping the temperature at 70-95 DEG C, introducing air to generate iron oxide black, settling the iron oxide black after the reaction is finished, and skimming supernatant. Experiments prove that the method provided by the invention can improve the chemical stability and chromaticity quality of the iron oxide black, effectively improves the quality of the iron oxide black product, and has extremely high industrial application value.

Description

technical field [0001] The invention belongs to the technical field of production of iron oxide pigments, and more specifically relates to a method for producing iron oxide black by liquid phase addition. Background technique [0002] Iron oxide black, the molecular formula is Fe 3 o 4 , is black powder, is Fe 2 o 3 It is an adduct with FeO, insoluble in water, magnetic, high in coloring power and hiding power, non-toxic and non-polluting. As an industrial raw material, iron oxide black is widely used in the fields of coatings, cosmetics, and biomedicine technology, and has broad development prospects. [0003] The current common production processes of iron oxide black in my country mainly include: [0004] Addition method: first mix ferrous sulfate solution with liquid caustic soda (NaOH), and react to form Fe(OH) 2 , and then add appropriate amount of iron yellow leftovers (FeSO 3 ), at 95 ~ 100 ℃ for addition reaction (reaction time about 68h) to generate iron bla...

Claims

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Application Information

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IPC IPC(8): C01G49/08
CPCC01G49/08
Inventor 单淼陆云飞张明
Owner YIXING YUXING IND & TRADE
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