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Preparation method of iron oxide red and ammonium chloride

A technology of iron oxide red and ammonium chloride, applied in iron oxide/iron hydroxide, iron oxide, ammonium halide and other directions, can solve the problem of high equipment investment and energy consumption, iron oxide tinting strength and color uniformity are not described, The problem of huge waste acid output, etc., achieves the effect of small investment in equipment, uniform and bright colors, and environmental friendliness.

Inactive Publication Date: 2016-01-06
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are also the shortcomings of relatively high equipment investment and energy consumption. In addition, the purity of iron oxide produced by this method is only above 98.3%, and there is no description of the tinting strength and color uniformity of iron oxide.
[0006] It can be seen that there are many problems in the existing production process of iron oxide. In addition, the output of waste acid in the hot-dip galvanizing industry is huge, and there is an urgent need for a new waste acid recycling process to improve the economic benefits of the enterprise and promote energy conservation, emission reduction and industrial upgrading in the galvanizing industry.

Method used

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  • Preparation method of iron oxide red and ammonium chloride
  • Preparation method of iron oxide red and ammonium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 2 Shown, this preparation iron oxide red and the method for ammonium chloride, its concrete steps comprise as follows:

[0030] (1) Reduction: First, mix and stir the waste acid and scrap steel chips or scrap steel scraps according to the liquid-solid ratio of 20:1ml / g to get all the iron into Fe 2+ solution (the Fe in the spent acid 3+ All reduced to Fe 2+ ); where the waste acid is the waste acid produced in the hot-dip galvanizing process, including the following mass percentage components: FeCl 2 40%, FeCl 3 5%, HCl4%, impurity content 0.3%, the balance is water;

[0031] (2) Low-temperature oxidation: adjust the pH value of the solution obtained in step (1) to 9.2 with ammonia water at a temperature of 3°C, and pass air into it for low-temperature oxidation for 150 minutes to make the FeCl in the waste acid 2 Converted to γ-FeOOH; the amount of air introduced is 0.3m 3 · Cubic solution -1 h -1 ;

[0032] (3) Medium-temperature oxidation: ra...

Embodiment 2

[0036] Such as figure 2 Shown, this preparation iron oxide red and the method for ammonium chloride, its concrete steps comprise as follows:

[0037] (1) Reduction: First, mix and stir the waste acid and scrap steel chips or scrap steel scraps according to the liquid-solid ratio of 50:1ml / g to obtain all the iron as Fe. 2+ solution (the Fe in the spent acid 3+ All reduced to Fe2+ ); where the waste acid is the waste acid produced in the hot-dip galvanizing process, including the following mass percentage components: FeCl 2 8%, FeCl 3 0.1%, HCl0.2%, impurity content 0.05%, the balance is water;

[0038] (2) Low-temperature oxidation: adjust the pH value of the solution obtained in step (1) to 11.9 with ammonia water at a temperature of 5°C, and pass air into it for low-temperature oxidation for 360 minutes to make the FeCl in the waste acid 2 Converted to γ-FeOOH; the amount of air introduced is 3.5m 3 · Cubic solution -1 h -1 ;

[0039] (3) Medium-temperature oxidatio...

Embodiment 3

[0043] Such as figure 2 Shown, this preparation iron oxide red and the method for ammonium chloride, its concrete steps comprise as follows:

[0044] (1) Reduction: First, mix and stir the waste acid and scrap steel chips or scrap steel scraps according to the liquid-solid ratio of 500:1ml / g to get all the iron into Fe 2+ solution (the Fe in the spent acid 3+ All reduced to Fe 2+ ); where the waste acid is the waste acid produced in the hot-dip galvanizing process, including the following mass percentage components: FeCl 2 25%, FeCl 3 4%, HCl3%, impurity content 0.25%, the balance is water;

[0045] (2) Low-temperature oxidation: adjust the pH value of the solution obtained in step (1) to 11.5 with ammonia water at a temperature of 7°C, and pass air into it for low-temperature oxidation for 400 minutes to make the FeCl in the waste acid 2 Converted to γ-FeOOH; the amount of air introduced is 3.2m 3 · Cubic solution -1 h -1 ;

[0046] (3) Medium-temperature oxidation:...

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Abstract

The invention relates to a preparation method of iron oxide red and ammonium chloride, and belongs to the technical field of waste resourceful treatment. The method is as below: mixing and evenly stirring waste acid and steel scrap or steel scrap leftover to obtain a solution with all iron in the form of Fe<2+> (reducing all Fe<3+> in the waste acid to Fe<2+>); adjusting the pH value of the obtained solution with ammonia, and at the same time introducing air or oxygen for oxidation at low temperature; heating the solution subjected to low temperature oxidation to 70-95 DEG C, adjusting the pH value of the solution by hydrochloric acid, introducing air or oxygen for middle temperature oxidation; filtering the turbid liquid to obtain a filter cake and a filtrate, washing the filter cake, drying at a temperature of 80-130 DEG C for 30-180 min to obtain iron oxide red with uniform color bright and purity greater than 99.5wt%; conducting vacuum distillation on the obtained filtrate and washing water to obtain a crystal, and drying the crystal at the temperature of 80-130 DEG C for 30-180 min to obtain NH4Cl with purity greater than 99.5 wt%. The method can produce high purity ammonium chloride and high tinting strength iron oxide red.

Description

technical field [0001] The invention relates to a method for preparing iron oxide red and ammonium chloride, which belongs to the technical field of waste resource treatment. Background technique [0002] With the rapid development of my country's hot-dip galvanizing industry in recent decades, the output and variety of hot-dip galvanizing products have increased year by year. The production process of hot-dip galvanizing is as figure 1 As shown, a large amount of waste slag, waste liquid and waste gas will be produced in the process of pickling and hot dip plating. If these waste residues, waste liquid and waste gas are not treated as resources, it will not only bring huge environmental pollution, but also cause waste of resources. The waste liquid produced by the galvanizing industry is basically all waste acid, and its chemical composition is: Fe 2+ / Fe 3+ Content~200g / L, HCl content~1wt%, trace Zn 2+ Wait. [0003] In terms of waste acid resource treatment, many do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01C1/16
Inventor 李世伟张利波彭金辉温洪新尹少华周俊文郭胜惠常军陈伟恒谢峰
Owner KUNMING UNIV OF SCI & TECH
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