Method for recycling iron-containing zinc-containing sludge to prepare zinc hydroxide and dye-grade iron oxide yellow

A technology of zinc hydroxide and iron oxide yellow, which is applied in the direction of zinc oxide/zinc hydroxide, iron oxide/iron hydroxide, iron oxide, etc., can solve the problems of difficult operation, cumbersome process, and high production cost, and achieve reduction The effect of production cost, protection of ecological environment, and elimination of secondary pollution

Inactive Publication Date: 2017-05-31
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the implementation of this process, the temperature of the solution is 100-120°C, and an autoclave is also required for production. The equipment investment is large and the operation is difficult, resulting in high productio...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for reclaiming and preparing zinc hydroxide and dye grade iron oxide yellow from iron-containing and zinc-containing sludge comprises the following steps:

[0046] Step 1, reduction purification

[0047] Adding mass percent concentration of 7% hydrochloric acid to the iron-containing and zinc-containing sludge fully dissolves the iron-containing and zinc-containing sludge, reduces and purifies iron ions, and adjusts the pH value to 0.7 to obtain a sludge solution; according to the liquid-solid ratio, Hydrochloric acid: sludge containing iron and zinc = 4:1;

[0048] Add scrap steel chips to the sludge solution, stir evenly, and reduce all the ferric iron in the iron-containing and zinc-containing sludge to ferrous iron to obtain zinc-containing Fe 2+ Solution; according to the liquid-solid ratio, sludge solution:scrap scrap=1:0.11;

[0049] Step 2, extraction and separation of iron and zinc

[0050] ZnFe 2+ The solution and the extractant are in countercurr...

Embodiment 2

[0062] A method for reclaiming and preparing zinc hydroxide and dye grade iron oxide yellow from iron-containing and zinc-containing sludge comprises the following steps:

[0063] Step 1, reduction purification

[0064] Adding hydrochloric acid with a mass percentage concentration of 35% to the iron-containing and zinc-containing sludge makes the iron-containing and zinc-containing sludge fully dissolved, reduces and purifies iron ions, and adjusts the pH value to 2.0 to obtain a sludge solution; according to the liquid-solid ratio, Hydrochloric acid: sludge containing iron and zinc = 0.76:1;

[0065] Add steel scrap scraps to the sludge solution, stir evenly, and reduce all the ferric iron in the iron-containing and zinc-containing sludge to ferrous iron to obtain zinc-containing Fe 2+ Solution; according to liquid-solid ratio, sludge solution: scrap steel leftovers=1:0.3;

[0066] Step 2, extraction and separation of iron and zinc

[0067] ZnFe 2+ The solution and the ex...

Embodiment 3

[0080] A method for reclaiming and preparing zinc hydroxide and dye grade iron oxide yellow from iron-containing and zinc-containing sludge comprises the following steps:

[0081] Step 1, reduction purification

[0082] Adding 20% ​​hydrochloric acid in iron-containing and zinc-containing sludge to fully dissolve the iron- and zinc-containing sludge, reducing and purifying iron ions, and adjusting the pH value to 1.0 to obtain a sludge solution; according to the liquid-solid ratio, Hydrochloric acid: iron-containing zinc-containing sludge=1.33:1;

[0083] Add scrap steel chips to the sludge solution, stir evenly, and reduce all the ferric iron in the iron-containing and zinc-containing sludge to ferrous iron to obtain zinc-containing Fe 2+ Solution; by liquid-solid ratio, sludge solution: scrap steel scrap=1:0.52;

[0084] Step 2, extraction and separation of iron and zinc

[0085] ZnFe 2+ The solution and the extractant were in countercurrent contact in a 4-stage extracti...

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PUM

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Abstract

The invention relates to a method for recycling iron-containing zinc-containing sludge to prepare zinc hydroxide and dye-grade iron oxide yellow and belongs to the field of waste resourceful treatment. The method comprises the steps of adding hydrochloric acid into iron-containing zinc-containing sludge to adjusting a pH value, then adding steel scrap, stirring, extracting in an extraction agent, classifying and deoiling; performing back extraction on zinc-containing load organic phase to prepare zinc hydroxide; adding alkaline substance into ferrous chloride solution with the zinc content smaller than or equal to 1g/L to adjust a pH value as 3.0 to 7.5 in 12 to 32 DEG C, introducing oxidizing gas, performing low-temperature oxidization with oxidization time of 60 to 1200min, warming to 50 to 90 DEG C, adding alkaline substance to adjust a pH value to be 2.8 to 3.6, introducing oxidizing gas, oxidizing for 30 to 115h, guaranteeing the pH value of liquid to be 2.8 to 3.6 in an oxidizing process, finishing oxidization, filtering and drying to obtain the dye-grade iron oxide yellow. The method is a recycling technology of iron-containing zinc-containing sludge in a hot galvanizing factory and has the advantages of small equipment invest, low energy consumption and high purity of a prepared product.

Description

technical field [0001] The invention belongs to the technical field of waste resource treatment, and in particular relates to a method for preparing zinc hydroxide and dye-grade iron oxide yellow by recycling iron-containing and zinc-containing sludge. Background technique [0002] The iron-containing sludge of the hot-dip galvanizing plant is the polluting waste slag discharged from the pickling water of the hot-dip galvanizing plant workshop. It is an industrial solid waste produced by adjusting the pH and aeration. Generally, the iron content is relatively large. Due to the differences in the processes of various manufacturers, the iron content is usually between 20-50%, and the zinc content is 1-7%. The main pollutants of sludge are ferric oxide, ferric hydroxide, ferrous hydroxide, zinc hydroxide, zinc oxide, etc. In addition to occupying a large amount of land during the stacking process, the sludge also seeps into the land due to these chemical components It is easy ...

Claims

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Application Information

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IPC IPC(8): C01G9/02C01G49/06
CPCC01G9/003C01G9/02C01G49/0009C01G49/06C01P2006/80
Inventor 高波王振峰温洪新徐宁
Owner NORTHEASTERN UNIV
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