Selective separation and recycling method for industrial solid waste slag

A solid waste, selective technology, used in solid separation, wet separation, chemical instruments and methods, etc., can solve the problems of equipment wear, difficult to achieve magnetic separation recovery, secondary dust pollution, etc. Selective separation and reduced energy consumption

Active Publication Date: 2016-08-10
TSINGHUA UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the whole, these technologies have achieved certain results in energy saving, magnetic material recovery, and comprehensive utilization of tailings, but there are still significant deficiencies.
First of all, because steel slag and metallurgical slag are calcined at high temperature, they have the characteristics of high hardness and large particle size, which are very difficult to crush and grind, and cause serious wear and tear on equipment; secondly, these solid wastes are mixtures with very fine crystallization. Separation efficiency and recovery rate, the particle size requirement is very fine (generally above 300 mesh), it needs to be pulverized and ground many times, and the energy consumption is very high
Have again, in similar CN1282635A method dry processing process, there is dust secondary pollution problem
Again, the recovery of useful components in solid waste residues in the prior art only relies on limited means such as "magnetic separation" and "gravity separation (or flotation)", but many metals and their oxides are not magnetic, and the fine crystal particles are bonded to each other. It is difficult to completely dissociate, so the recovery effect of non-magnetic metals and their oxides is not ideal
[0004] A large number of studies have shown that most industrial solid wastes contain a large amount of silicates, and some of them are in an amorphous state microscopically, and become the main bridge for the bonding of crystalline particles or metal particles in solid wastes; secondly, only iron , chromium and other metals and some of their oxides are more or less magnetic, while most of the other components are not magnetic, and it is difficult to achieve the required effect by pure magnetic separation recovery; in addition, these solid waste residues are not only metal or alloy particles, other large The crystalline particles of some substances are very fine, and the general particle size is mostly between a few microns and tens of microns

Method used

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  • Selective separation and recycling method for industrial solid waste slag
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  • Selective separation and recycling method for industrial solid waste slag

Examples

Experimental program
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Effect test

Embodiment 1

[0039]Weigh 50 kilograms of blast furnace steel slag, add 100 grams of sulfuric acid, 11 grams of cetyl ammonium bromide, 100 grams of natron (45°, modulus 3.0), mix and stir for 30 minutes, and let stand for 4 hours; then start the rod mill machine, feed circulating liquid at a speed of 30 liters / min (clear water is fed in at the beginning stage), continuously add mixed slurry, overflow liquid enters three-stage magnetic separator, magnetically separated solids are mixed, dehydrated and dried; after magnetic separation, the slurry Enter the conical overflow settler, the lower sediment returns to the rod mill to continue grinding, the upper overflow flows into the precision sedimentation tank, the water channel of the sedimentation tank is divided into three sections, the residence time is 10 seconds, 50 seconds and 19 minutes respectively, the total residence time After 20 minutes, after settling, the supernatant was returned to the rod mill for recycling. The solid slurry se...

Embodiment 2

[0045] Weigh 50 kilograms of stainless steel smelting waste residue, add 100 grams of 1:1:1 nitric acid, hydrochloric acid, acetic acid mixed solution, 20 grams of 1:1:1 imidazoline, oleic acid, triethanolamine mixed solution, 1:1:1 sulfuric acid Sodium, sodium metasilicate, 100 grams of natron (45 °, modulus 3.0) mixture, mixed and stirred for 30 minutes, left standstill for 6 hours; then start the rod mill, feed the circulating clear liquid with 20 liters / minute speed ( In the initial stage, clean water is fed), and the mixed slurry is continuously added, and the overflow liquid enters the three-stage magnetic separator, and the magnetically separated solids are mixed, dehydrated and dried; after magnetic separation, the slurry enters the conical overflow settler, and the lower sediment returns to the rod The mill continues to grind, the upper overflow flows into the precision settling tank, the water channel of the settling tank is divided into four sections, the residence t...

Embodiment 3

[0052] Take by weighing 50 kilograms of metal zinc smelting waste residues, add 100 grams of 1:1:1 formic acid, acetic acid, benzoic acid mixed solution, 1:1:1 cetyl ammonium bromide, oleic acid, cationic polyacrylamide mixed solution 20 gram, 100 grams of glycerol, sodium hexametaphosphate, sodium hexametaphosphate (45 °, modulus 3.0) mixture of 1:1:1, mixed and stirred for 30 minutes, left standstill for 3 hours; then start the ball mill, with 10 liters / The circulating clear liquid is introduced at different speeds (clear water is introduced at the beginning stage), and the mixed slurry is continuously added, and the overflow liquid enters the three-stage magnetic separator, and the solids separated by magnetic separation are mixed, dehydrated and dried; after magnetic separation, the slurry enters the conical overflow Settler, the lower part of the sediment returns to the ball mill to continue grinding, the upper overflow flows into the precision settling tank, the water ch...

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Abstract

Disclosed is a selective separation and recycling method for industrial solid waste slag. The selective separation and recycling method is suitable for recycling the solid waste slag generated in steel, metallurgy and chemical industries. The selective separation and recycling method is based on the systematic study of the microstructure of the industrial solid waste slag, high-selectivity chemical agents are adopted, through soaking, milling, magnetic separation, multistage sedimentation and other process steps, bonding materials between crystalline particles are dissolved or softened, and thus spatial dissociation of the crystalline particles with different components is achieved with a chemical method. Meanwhile, the surface characteristics of certain crystalline particles are changed selectively through the high-selectivity chemical agents, the differences of the sedimentation performance of different components are enhanced, separation of multistage sedimentation is completed conveniently, thus the separation efficiency is improved, energy consumption can be reduced by a large margin, and the treatment process is simplified. The selective separation and recycling method is suitable for recycling steel slag, stainless steel slag, metallurgy waste slag and the like and can also be used for recycling useful components or enrichment of certain trace elements from chemical solid waste slag.

Description

technical field [0001] The invention belongs to the technical field of recycling industrial solid waste residues, and is suitable for recycling useful metals and compounds thereof from solid waste residues produced in iron and steel, metallurgy and chemical industries. Background technique [0002] In the production process of iron and steel, metallurgy, and chemical industry, a large amount of solid waste slag containing metals and their oxides is often discharged, such as iron slag from the ironmaking industry, steel slag from the steel industry, steel slag from the stainless steel industry, metallurgical slag from the non-ferrous metallurgy industry, etc. On the one hand, these solid waste residues mostly contain elements such as iron, nickel, chromium, manganese and trace amounts of precious metals silver, beryllium and their compounds. The open-air stacking not only takes up a lot of land, but also seriously pollutes the surrounding soil and water bodies; on the other ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B9/04B03B1/04
CPCB03B1/04B03B7/00B03B9/04
Inventor 向兰张英才
Owner TSINGHUA UNIV
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