Method for comprehensive treatment of industrial waste

A technology for comprehensive treatment of industrial waste, which is applied in the field of comprehensive treatment of industrial waste and waste, can solve the problems of polluting the environment, increasing energy consumption and waste of ironmaking coal (coke), and achieve the effect of reducing pollution

Active Publication Date: 2011-07-27
唐山汇鑫嘉德节能减排科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current treatment methods are as follows: First, after mixing the sintering dust with blast furnace gas mud, the metal elements such as lead and zinc contained in it are extracted by volatilization, while the valuable substances in the sintering dust such as potassium chloride have not been properly obtained. The second is to return the sintering dust to the sinter production and use it as a sintering raw material, which makes the valuable components in it waste because it cannot be recycled; the third is to use the sintering dust as a blast furnace blend If the material is directly added to the blast furnace, due to the particularity of sintering fumes, it will corrode the furnace wall of the blast furnace and increase the energy consumption of coal (coke) for ironmaking, etc.
In addition, improper disposal of sintering fume will seriously pollute the environment
At the same time, there is no relatively complete comprehensive treatment method for this kind of sintering fume containing multiple valuable elements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Raw material: The treated sintering dust contains 20% iron, 14.26% potassium, 25.22% chlorine, 300g / t silver of sintering dust, 6% lead, 0.6% zinc, 0.3% copper, 10% Calcium, 3% sodium, 1% magnesium, and other trace ingredients;

[0026] Processing steps:

[0027] A. According to the solid-to-liquid mass ratio of 1:1, add water to the sintering soot, and perform leaching under the conditions of conventional stirring and room temperature, and the leaching time is 15 minutes, so that the soluble chloride in the sintering soot can be leached into the In water, leach residue and leachate are separated by filtration;

[0028] B. According to the amount of 1g / L solution, add iron powder to the leaching solution in step A, and perform replacement under the conditions of conventional stirring, temperature of 40°C, and replacement time of 15 minutes, so as to replace copper and lead in the leaching solution And into the slag, separated by filtration to obtain the replacement sl...

Embodiment 2

[0035] Raw materials: sintering dust contains 20% iron, 19.56% potassium, 24% chlorine, 300g / t sintering dust silver, 9% lead, 1.0% zinc, 0.5% copper, 10% calcium, 3% sodium, 1% magnesium, and other trace ingredients;

[0036] Processing steps:

[0037] A. According to the solid-to-liquid mass ratio of 1:3, add water to the sintering dust, and leaching under the conditions of conventional stirring and 90°C, and the leaching time is 2 hours, so that the soluble chloride in the sintering dust is leached into the water, filtered and separated to obtain leaching residue and leaching liquid;

[0038] B. According to the amount of 2g / L solution, add zinc powder to the leaching solution in step A, and perform replacement under the conditions of conventional stirring, temperature of 70°C, and replacement time of 1 hour, so as to replace copper and lead in the leaching solution And into the slag, separated by filtration to obtain the replacement slag and replacement liquid;

[0039]...

Embodiment 3

[0045] Raw materials: sintering dust contains 20% iron, 19.56% potassium, 24% chlorine, 300g / t sintering dust silver, 9% lead, 1.0% zinc, 0.5% copper, 10% calcium, 3% sodium, 1% magnesium, and other trace ingredients;

[0046] Processing steps:

[0047] A. According to the solid-to-liquid mass ratio of 1:2, add water to the sintering dust, and perform leaching under the conditions of conventional stirring and 60°C, and the leaching time is 1 hour, so that the soluble chloride in the sintering dust is leached into the water, filtered and separated to obtain leaching residue and leaching liquid;

[0048] B. According to the amount of 1.5g / L solution, add zinc powder to the leaching solution in step A, and perform replacement under the conditions of conventional stirring, temperature of 50°C, and replacement time of 0.6 hours, so as to replace copper and lead in the leaching solution Come out and enter the slag, and separate by filtration to obtain the replacement slag and repl...

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PUM

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Abstract

The invention provides a method for the comprehensive treatment of industrial waste, which comprises the steps of: adding water to sintering smoke dust ash for leaching in order to separate leaching residue from a leaching solution; adding a displacer to the leaching solution for displacement, and obtaining displacement residue and a displacement solution through separation; adding a precipitant to the displacement solution for precipitation, and obtaining residue and a solution through separation; concentrating and crystallizing the solution to obtain a potassium chloride product; water-rinsing the leaching residue and separating residue and lotion out, returning the lotion to the leaching step for being recycled; and obtaining iron ore powder and residue through magnetic separation of the residue. The method can be used for effectively recovering potassium chloride and iron ore powder in the sintering smoke dust, wherein the content of the recovered potassium chloride reaches more than 90%, thereby offering a new raw material source for sylvite production factories; and the iron content of the iron ore powder reaches more than 60%, the residues which are rich in valuable metals such as copper, lead, zinc, calcium, silver and the like are simultaneously collected, and the valuable metals are further extracted through subsequent processes in order to change wastes into valuable, reduce the environmental pollution caused by the waste, thereby carving out a new application way for the utilization of the sintering smoke dust ash.

Description

technical field [0001] The invention relates to a method for treating waste, in particular to a method for comprehensively treating industrial waste, and belongs to the technical field of industrial waste treatment. Background technique [0002] Sintering fumes are wastes produced during the production of sintering ore, the raw material for blast furnace ironmaking. In the process of iron and steel production, in order to make full use of powdered ore raw materials and improve the stability of the ironmaking process, iron and steel enterprises mostly spread a mixture of iron ore powder, coke powder and binder on the sintering machine, and then top-down Ventilation sintering is carried out so that the iron ore powder is sintered into blocks. Therefore, a large amount of dust will be discharged with the flue gas during the sintering process. After the flue gas containing dust is collected by the dust removal system, a large amount of sintering soot will be obtained. Analysis ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B3/04
CPCY02P10/20
Inventor 闫新平蒋宝华刘竹焕
Owner 唐山汇鑫嘉德节能减排科技股份有限公司
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