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Method for preparing nano-sized zinc ferrite through comprehensive treatment of zinc containing steel pickling waste liquid

A technology for iron and steel pickling waste liquid and nano-zinc ferrite, which is applied in the directions of nanotechnology, nanotechnology, iron compounds, etc., can solve problems such as environmental pollution of zinc-containing pickling waste liquid, and achieves low cost, high product quality, and investment. low effect

Inactive Publication Date: 2016-07-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its particularity, the iron and steel industry has never had a suitable solution to the extremely serious environmental pollution caused by zinc-containing pickling waste

Method used

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  • Method for preparing nano-sized zinc ferrite through comprehensive treatment of zinc containing steel pickling waste liquid
  • Method for preparing nano-sized zinc ferrite through comprehensive treatment of zinc containing steel pickling waste liquid
  • Method for preparing nano-sized zinc ferrite through comprehensive treatment of zinc containing steel pickling waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for comprehensively treating zinc-containing iron and steel pickling waste to prepare nano-zinc ferrite, comprising the steps of:

[0030] (1) Add iron powder to the waste zinc-containing iron and steel pickling liquid (60ml, 78g) to reduce ferric iron, the added mass of iron powder is 0.5% of the mass of the zinc-containing iron and steel pickling waste liquid, stir evenly, and place for 14h;

[0031] (2) Use sodium hydroxide to adjust the pH of the liquid obtained in step (1) to 6, add cationic polyacrylamide to make the final concentration of polyacrylamide 65mg / L, stir at 65°C for 1h, let stand for 1h, and filter to obtain secondary treatment fluid;

[0032] (3) Measure Zn in the secondary treatment solution 2+ and Fe 总 The amount concentration of the substance, n(Zn 2+ )=0.43mol / L; n(Fe 总 )=3.324mol / L

[0033] (where n(Fe 2+ )=3.299mol / L, n(Fe 3+ )=0.025mol / L) at a temperature of 25°C under stirring, add zinc chloride aqueous solution (6.63g solid Z...

Embodiment 2

[0037] A method for comprehensively treating zinc-containing iron and steel pickling waste to prepare nano-zinc ferrite, comprising the steps of:

[0038] (1) Add iron powder to the waste zinc-containing steel pickling liquid (300ml, 390g) to reduce ferric iron, the amount of iron powder added is 0.2% of the mass of the waste zinc-containing steel pickling liquid, stir evenly, and place for 14h;

[0039] (2) Use sodium hydroxide to adjust the pH of the liquid obtained in step (1) to 3, add cationic polyacrylamide to make the final concentration of polyacrylamide 40mg / L, stir at 40°C for 3h, let stand for 1h, and filter to obtain secondary treatment fluid;

[0040] (3) Measure Zn in the secondary treatment solution 2+ and Fe 总 The amount concentration of the substance, n(Zn 2+)=0.43mol / L; n(Fe 总 )=3.324mol / L (wherein n(Fe 2+ )=3.299mol / L, n(Fe 3+ )=0.025mol / L) at a temperature of 80°C under stirring, add zinc chloride aqueous solution (45.41g solid ZnCl 2 Dissolve in 20m...

Embodiment 3

[0045] A method for comprehensively treating zinc-containing iron and steel pickling waste to prepare nano-zinc ferrite, comprising the steps of:

[0046] (1) Add iron powder to reduce ferric iron in zinc-containing iron and steel pickling waste liquid (200ml, 260g), the added mass of iron powder is 1% of the mass of zinc-containing iron and steel pickling waste liquid, stir evenly, and place for 8h;

[0047] (2) Use sodium hydroxide to adjust the pH of the liquid obtained in step (1) to 6, add cationic polyacrylamide to make the final concentration of polyacrylamide 80mg / L, stir at 80°C for 0.5h, let stand for 1h, filter, Obtain the secondary treatment liquid;

[0048] (3) Measure Zn in the secondary treatment solution 2+ and Fe 总 The amount concentration of the substance, n(Zn 2+ )=0.43mol / L; n(Fe 总 )=3.324mol / L (wherein n(Fe 2+ )=3.299mol / L, n(Fe 3+ )=0.025mol / L), at a temperature of 50°C, under stirring, add zinc chloride aqueous solution (34.77g solid ZnCl 2 be dis...

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Abstract

The invention discloses a method for preparing nano-sized zinc ferrite through comprehensive treatment of zinc containing steel pickling waste liquid.The method comprises the following steps that 1, reductant ferric iron is added into the zinc containing steel pickling waste liquid, and the mixture is stirred to be uniform and stands for 8-14 h; 2, pH is regulated to 3-6, auxiliaries are added, stirring, standing and filtering are conducted at the temperature of 40-80 DEG C, and secondary treating fluid is obtained; 3, the total amount-of-substance concentration of Zn2+ and Fe in the secondary treating fluid is measured, and zinc chloride or zinc oxide and water are added while stirring; 4, a precipitator is added while stirring, sediment is generated, and stirring is continued; 5, filtering is conducted, and obtained filtrate is used for replacing the water in the step 3; filter cakes are washed, dried, ground and calcined to obtain nano-sized zinc ferrite.The zinc containing steel pickling waste liquid is subjected to recycled innocent treatment, cost is low, efficiency is high, product quality is high, environment friendliness is achieved, and a good technical scheme is provided for treatment of the zinc containing pickling waste liquid in the steel industry.

Description

technical field [0001] The invention relates to the field of preparation of inorganic nano-functional materials, in particular to a method for preparing nano-zinc ferrite from zinc-containing iron and steel pickling waste liquid. Background technique [0002] In the steel industry, since pickling is an unavoidable step, a large amount of steel pickling waste is produced every day. The waste liquid of iron and steel pickling mainly refers to hydrochloric acid. The waste liquid of iron and steel hydrochloric acid pickling contains high concentration of hydrochloric acid and ferrous ions. The pH of the waste pickling liquid is about 0.2-3.0, and the main component is Fe. 2+ , containing a small amount of Fe 3+ and some other impurities, some also contain trace amounts of PO 4 3- , Zn 2+ , commonly known as "pickling solution". Therefore, if the waste liquid is discharged directly without treatment, it will cause serious environmental pollution and lead to a series of envir...

Claims

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Application Information

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IPC IPC(8): C01G49/00B82Y30/00
CPCC01G49/00B82Y30/00C01P2002/72C01P2004/04C01P2004/64
Inventor 王兴尧陈莉万光琴
Owner TIANJIN UNIV
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