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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 has certain environmental pollution
[0007] Based on various factors, the precipitation oxidation method is currently the most used iron oxide black production method, but it can still be improved according to changes in specific production conditions, and it is possible to improve production efficiency and product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 0.5% ferrous sulfate solution preheated to 70°C into the reaction kettle, keep it warm at 70-95°C, and let air flow in at 25M 3 Under the condition of / min, add NaOH solution, ferrous sulfate and sodium hydroxide take place addition reaction, generate iron ferric oxide, after reaction is finished, stop stirring, ferric oxide sedimentation gathers 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 pass in air 25M 3 / min, continue to generate ferric oxide at 70-95°C. In this way, in a reaction kettle, the reaction produces ferric oxide - ferric oxide settles - removes the supernatant and circulates 3 times, collects and washes the precipitate, and then undergoes conventional pressure filtration, drying, and grinding to obtain iron oxide black.

Embodiment 2

[0022] Add 0.5% ferrous sulfate solution preheated to 70°C into the reaction kettle, keep it warm at 80-95°C, and let air flow in at 30M 3 Under the condition of / min, add NaOH solution, ferrous sulfate and sodium hydroxide take place addition reaction, generate iron ferric oxide, after reaction is finished, stop stirring, ferric oxide sedimentation gathers at the bottom of the reactor, after the sedimentation is completed Remove the supernatant, keep the generated ferric oxide in the reactor, continue to add 0.5% ferrous sulfate solution preheated to 70°C into the reactor, add NaOH solution, and feed the air at a rate of 30M 3 / min, continue to generate ferric oxide at 70-95°C. In this way, in a reaction kettle, the reaction produces ferric oxide - ferric oxide settles - removes the supernatant and circulates 5 times, collects and washes the precipitate, and then undergoes conventional pressure filtration, drying, and grinding to obtain iron oxide black.

Embodiment 3

[0024] Add 0.5% ferrous sulfate solution preheated to 70°C into the reaction kettle, keep it warm at 80-95°C, and let air flow in at 30M 3 Under the condition of / min, add NaOH solution, ferrous sulfate and sodium hydroxide take place addition reaction, generate iron ferric oxide, after reaction is finished, stop stirring, ferric oxide sedimentation gathers at the bottom of the reactor, after the sedimentation is completed Remove the supernatant, keep the generated ferric oxide in the reactor, continue to add 0.5% ferrous sulfate solution preheated to 70°C into the reactor, add NaOH solution, and feed the air at a rate of 30M 3 / min, continue to generate ferric oxide at 70-95°C. In this way, in a reaction kettle, the reaction produces ferric oxide - ferric oxide settles - removes the supernatant and circulates 8 times, collects and washes the precipitate, and then undergoes conventional pressure filtration, drying, and grinding to obtain iron oxide black.

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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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