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Method for preparing iron oxide red by utilizing iron-containing pickling waste liquid

A technology of pickling waste liquid and iron oxide red, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, process efficiency improvement, etc., can solve the problems of large amount of mother liquor, large amount of recovered salt evaporation, and low space-time efficiency , to achieve the effect of low operating cost and significant economic benefits

Active Publication Date: 2021-06-01
JIACHENG ENVIRONMENTAL PROTECTION ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The problems existing in the above existing documents are as follows: the one is using ammonia liquor as precipitant, will introduce nitrogen element in the system, produces new ammonia nitrogen pollutant; Take sodium hydroxide as neutralizing agent, every ton of iron red needs about 3 tons of 30% sodium hydroxide, the production cost is relatively high; the second is that the space-time efficiency is low, the mother liquor is produced in a large amount, and the low salt content causes a large amount of recovered salt evaporation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In the production process of a steel factory, in order to remove the iron oxide scale on the surface, hydrochloric acid was used to wash it, and a large amount of iron-containing pickling solution was produced. Make an effective volume of 10m 3 Reactor, then carry out following reaction:

[0036] A. Put the iron-containing pickling waste liquid raw material in the reactor, the loading capacity is 15% of the volume of the reactor, add the calcium hydroxide emulsion with a concentration of 600g / L into the reactor until the pH of the solution is 8.2, and undergo reaction aging Generate ferrous hydroxide; calcium hydroxide emulsion is prepared from calcium hydroxide with a particle size of 600 mesh and tap water;

[0037] B. Generation of seed crystal δ-FeOOH

[0038] Stir the material in the reactor at a speed of 40 rpm, add hydrogen peroxide with a volume concentration of 1% of the material in the reactor, and the volume percentage concentration of hydrogen peroxide is ...

Embodiment 2

[0047] In the production process of a steel factory, in order to remove the iron oxide scale on the surface, hydrochloric acid was used to wash it, and a large amount of iron-containing pickling solution was produced. Make an effective volume of 10m 3 Reactor, then carry out following reaction:

[0048] A. Put the raw materials of iron-containing pickling waste liquid in the reactor, and the loading capacity is 15% of the volume of the reactor. Add the calcium hydroxide emulsion with a concentration of 800g / L into the reactor until the pH of the solution is 8.8. After reaction and aging Generate ferrous hydroxide; calcium hydroxide emulsion is prepared from calcium hydroxide with a particle size of 1200 mesh and tap water;

[0049] B. Generation of seed crystal δ-FeOOH

[0050] Stir the material in the reactor at a speed of 60 r / min, add hydrogen peroxide with a volume concentration of 2% of the material in the reactor, and the volume percentage concentration of hydrogen per...

Embodiment 3

[0059] In the production process of a steel factory, in order to remove the iron oxide scale on the surface, hydrochloric acid was used to wash it, and a large amount of iron-containing pickling solution was produced. Make an effective volume of 10m 3 Reactor, then carry out following reaction:

[0060] A. Put the iron-containing pickling waste liquid raw material in the reactor, the loading capacity is 20% of the volume of the reactor, add the calcium hydroxide emulsion with a concentration of 700g / L into the reactor until the pH of the solution is 8.5, and undergo reaction aging Generate ferrous hydroxide; calcium hydroxide emulsion is prepared from calcium hydroxide with a particle size of 900 mesh and tap water;

[0061] B. Generation of seed crystal δ-FeOOH

[0062] Stir the material in the reactor at a speed of 50 rpm, add hydrogen peroxide with a volume concentration of 1.5% of the material in the reactor, and the volume percentage concentration of hydrogen peroxide i...

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Abstract

The invention relates to a preparation method of pigment-grade iron oxide red, in particular to a method for preparing iron oxide red by utilizing iron-containing pickling waste liquid. The method comprises the following process steps of: generating ferrous hydroxide, generating seed crystal delta-FeOOH, generating a-Fe2O3 crystal nucleus, carrying out in-situ reaction, preparing solid iron oxide red and calcium chloride and the like. The method effectively solves the problems of high production cost, low space-time efficiency and the like in the prior art, and has the advantages that the economic benefit is remarkable, the operation cost is low, and the product meets the relevant requirements of the national standard.

Description

technical field [0001] The invention relates to a preparation method of pigment-grade iron oxide red, in particular to a method for preparing iron oxide red by utilizing iron-containing pickling waste liquid. Background technique [0002] Pickling is a method of chemically removing the oxidized rust layer from the surface of steel. The hydrochloric acid pickling process has the advantages of fast pickling speed, good effect and good economic benefits, and is widely used in the steel industry. When iron and steel are dissolved with hydrochloric acid to form iron (II) hydrochloride. Iron-containing pickling solution (the main component is ferric chloride) is a strong corrosive solution, and contains a large amount of dissolved iron (II) and hydrochloric acid. If the pickling solution is directly discharged into the environment, it will not only cause a large amount of iron loss, and cause irreparable damage to the environment, so it is included in the "National List of Hazar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01F11/24C01F11/28
CPCC01G49/06C01F11/24C01F11/28C01P2004/61C01P2006/80Y02P10/20
Inventor 安少锋魏雨王晓磊李小亚张立博王伟燕李兴美吴江渤陈金杰康梦远李阳
Owner JIACHENG ENVIRONMENTAL PROTECTION ENG CO LTD
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