A kind of iron oxide red production method

A technology of iron oxide red and its production method, which is applied in the field of chemical pigments, can solve the problems of high treatment investment and treatment cost, and achieve the effect of reducing production cost and consumption

Active Publication Date: 2021-03-09
河北恒丰化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN108176203A proposes a five-step method of cooling and dust removal, concentrated nitric acid oxidation, dilute nitric acid absorption, alkali absorption and selective catalytic reduction (SCR) to treat nitrogen oxide tail gas. These terminal treatment investment and treatment costs are high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of iron oxide red seed slurry:

[0032] Add 14.32Kg iron sheets and 110Kg water to the seed crystal reactor, heat the medium in the seed crystal reactor to 85°C and seal the seed crystal reactor, add 18Kg of dilute nitric acid with a concentration of 32%, and simultaneously add Introduce oxygen to keep the oxygen partial pressure in the container above 0.1MPa, use a self-priming stirrer to disperse the gas in the seed crystal reactor in the liquid phase, continue the reaction for 90 minutes after adding nitric acid, and prepare iron oxide red crystal kind of slurry. After measurement, the slurry iron oxide red crystal seed 13.76Kg, nitrogen oxide content (in NO 2 Total) is 496mg / m 3 . A slurry containing 2.39Kg of iron oxide red seeds can be prepared per kilogram of nitric acid.

Embodiment 2

[0034] Preparation of iron oxide red seed slurry:

[0035] Add 14.41Kg iron sheets and 110Kg water to the seed crystal reactor, heat the medium in the seed crystal reactor to 85°C and seal the reactor, add 17.2Kg of dilute nitric acid with a concentration of 32%, and simultaneously feed oxygen into the container , keep the oxygen partial pressure in the container above 0.06MPa, use the air compressor to pressurize the gas in the seed crystal reactor and blow it into the liquid phase, the circulation flow rate of the gas is 0.4m 3 / h, after the nitric acid has been added, the gas continues to circulate for 90min, and the reaction ends, and the gas circulation is stopped. The measured slurry contains 13.87Kg of iron oxide red crystal seeds, and the content of nitrogen oxides in the tail gas (in terms of NO 2 Count) is 287mg / m 3 . 2.52Kg iron red seeds can be produced per kilogram of nitric acid.

Embodiment 3

[0037] Preparation of iron oxide red seed slurry:

[0038] Add 14.5Kg iron sheets and 110Kg water to the seed crystal reactor, heat the medium in the seed crystal reactor to 160°C and seal the reactor, add 17.5Kg of dilute nitric acid with a concentration of 32%, and simultaneously feed oxygen into the container , keep the oxygen partial pressure in the container above 0.08MPa, use the Venturi injector to circulate and disperse the gas in the seed crystal reactor in the liquid phase, react for 90min, and the reaction ends. The measured slurry contains 13.82Kg of iron oxide red crystal seeds, and the content of nitrogen oxides in the tail gas (in terms of NO 2 Total) is 352mg / m 3 . A slurry containing 2.46Kg of iron oxide red seeds can be prepared per kilogram of nitric acid.

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PUM

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Abstract

The invention discloses a production method of iron oxide red, which belongs to the technical field of chemical pigments. The method comprises adding metallic iron and water into a closed seed crystal reactor, heating up to a predetermined initial reaction temperature; adding dilute nitric acid into the seed crystal reactor, and feeding oxygen at the same time to react to prepare iron oxide red Seed slurry: adding the iron oxide red seed slurry with water, ferrous salt and metallic iron into a closed two-step oxidation reactor or adding the iron oxide red seed slurry with water, ferrous nitrate and alkali Add it into a closed two-step oxidation reactor; feed it with oxygen, and raise the temperature to the predetermined temperature of the second-step oxidation reaction to carry out the oxidation reaction to obtain iron oxide red. The invention solves the problem of nitrogen oxide pollution emission from the process source. Moreover, the consumption of ferrous nitrate per kilogram of iron oxide red produced by the production method is also less than that consumed by other processes, which reduces the production cost and is economical and practical.

Description

technical field [0001] The invention belongs to the technical field of chemical pigments, and in particular relates to a production method of iron oxide red. Background technique [0002] Iron oxide red has strong coloring power, strong hiding power, non-toxicity and stable physical and chemical properties. It is widely used as a pigment in paint coatings, inks, ceramics, building materials, plastics and papermaking. In addition, it can also be used in the fields of catalysis and battery anode materials. The performance of iron oxide red is closely related to the primary particle size of iron oxide red crystals. Different application fields have different requirements for the primary particle size and distribution of iron oxide red. The particle size and particle size distribution of iron oxide red products are closely related to the production process conditions. Changes in production process conditions will lead to changes in the crystal particle size and distribution of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06
CPCC01G49/06
Inventor 林高鹏
Owner 河北恒丰化工科技有限公司
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