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Method for producing ferroferric oxide magnetic powder by recycling industrial waste acid and red mud

A technology of ferromagnetic tetroxide and industrial waste acid, applied in the directions of iron oxide/iron hydroxide, ferrous oxide, etc., can solve the problems of secondary pollution of waste acid and red mud, etc., to achieve environmental and economic The effect of win-win benefits, low technical level of workers, and less equipment

Active Publication Date: 2016-11-16
天津市国润永泰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for resourceful treatment and disposal of industrial waste acid and red mud, which can not only effectively solve the secondary pollution problem of waste acid and red mud, but also recover all effective substances in waste acid and red mud , forming the main product of ferroferric oxide magnetic powder and by-products such as calcium chloride, creating a certain economic value while solving pollution, and achieving a win-win environment and economy

Method used

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  • Method for producing ferroferric oxide magnetic powder by recycling industrial waste acid and red mud
  • Method for producing ferroferric oxide magnetic powder by recycling industrial waste acid and red mud
  • Method for producing ferroferric oxide magnetic powder by recycling industrial waste acid and red mud

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Effect test

Embodiment 1

[0033] (1) Mixed reaction: pre-neutralize the hydrochloric acid waste liquid and the red mud raw material according to the mass ratio of 3:1;

[0034] (2) Filtration: The mixed liquid of the preliminary reaction is lifted to the mixed liquid filter by the pump, and the filtrate enters the reactor of the next process, and the filtered residue flows into the filter residue storage tank;

[0035] (3) Reactor: The filtered mixed suspension is lifted into the reactor by a pump, and the reactor is heated to 80°C. At the same time, an oxidant and an alkali solution as a precipitant are added to the mixed solution, and a stirring system is installed in the reactor to ensure The reaction is uniform and efficient, the pH value of the filtrate reaches 9, and the reaction time is more than 2 hours; the alkaline solution is calcium hydroxide, and the oxidant is hydrogen peroxide, wherein the amount of hydrogen peroxide is based on the mass ratio of total iron: hydrogen peroxide = 1:25 dosi...

Embodiment 2

[0039] (1) Mixed reaction: pre-neutralize the hydrochloric acid waste liquid and the red mud raw material according to the mass ratio of 5:1;

[0040] (2) Filtration: The mixed liquid of the preliminary reaction is lifted to the mixed liquid filter by the pump, and the filtrate enters the reactor of the next process, and the filtered residue flows into the filter residue storage tank;

[0041] (3) Reactor: The filtered mixed suspension is lifted into the reactor by a pump, and the reactor is heated to 90°C. At the same time, an oxidant and an alkali solution as a precipitating agent are added to the mixed solution, and a stirring system is installed in the reactor to ensure The reaction is uniform and efficient, the pH value of the filtrate reaches 11, and the reaction time is 4 hours; the alkaline solution is calcium hydroxide, and the oxidant is hydrogen peroxide; the amount of hydrogen peroxide is based on the mass ratio of total iron: hydrogen peroxide=1 :90 dosing;

[00...

Embodiment 3

[0045] Select the red mud from iron and steel industry to produce and the hydrochloric acid waste liquid recycling example that produces in mechanical processing, in conjunction with accompanying drawing, the implementation process of the present invention is described in detail:

[0046] The hydrochloric acid waste liquid is lifted by the pump and mixed with the red mud. The hydrochloric acid waste liquid and the red mud undergo a preliminary neutralization reaction. The mixing ratio of the hydrochloric acid waste liquid and the red mud is 3:1 (mass ratio). The pump is lifted to the mixed liquid filter for filtration, and the filtrate flows into the filtrate storage tank. The filter residue is filtered and reduced by the plate and frame filter press and then transported out for disposal. The filtrate produced during the plate and frame filter press process is returned to the waste acid liquid storage tank. After filtering, the reaction solution is pumped into the reactor, and ...

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Abstract

The invention discloses a method for producing ferroferric oxide magnetic powder by recycling industrial waste acid and red mud. The method comprises the steps of: mixing hydrochloric acid waste liquid with the red mud according to a ratio of (3-5):1; lifting a mixed solution of an initial reaction to a mixed solution filter through a pump, wherein a filtrate flows into a filtrate storage tank, filter residues are subjected to pressure filtration reduction through a plate-and-frame filter press, then the treated filter residues are transported outwards for disposal, and a plate-and-frame pressure filtration solution is returned back into a waste acid solution storage tank for recycling; lifting a mixed suspension after filtration into a reaction kettle by a pump, heating the reaction kettle to 80-90 DEG C, adding an oxidant and an alkaline solution into the mixed solution at the same time, wherein a stirring system is arranged in the reaction kettle to ensure uniformity and high efficiency of the reaction, and allowing the mixed solution to react in the reaction kettle to generate hydrous ferroferric oxide magnetic powder; performing magnetic separation on wet ferroferric oxide, and performing water washing to obtain a ferroferric oxide magnetic powder crude product, and drying the crude product and purifying the dried crude product to form high-purity ferroferric oxide magnetic powder. The method disclosed by the invention reduces the treatment cost for hazardous wastes and waste acid liquid, and the obtained product is stable in quality and performance and is safe. An environmental and economic benefit win-win effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and chemical industry, and relates to a method for producing iron ferric oxide magnetic powder by using industrial waste acid and red mud as resources. Background technique [0002] The surface pretreatment of various metal materials is required before the processing of metal products in industries such as iron and steel or electroplating. During the production process of pretreatment, both high-concentration waste acid and a large amount of acid wastewater are generated. Along with the pickling, a large amount of pickling wastewater containing hydrochloric acid or sulfuric acid and ferrous ions will be produced. For example, the pickling wastewater discharged by a medium-sized rolling mill is as many as tens of tons or even hundreds of tons every day. Its typical composition is 5-15% hydrochloric acid and 80-250g / L ferrous ion content. Because waste acid and waste water treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08
CPCC01G49/08C01P2006/80
Inventor 李铭戴承昊
Owner 天津市国润永泰环保科技有限公司
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