Method for adsorbing phosphorus pollutants in water by using waste residues in iron and steel industry

A phosphorus pollutant and iron and steel industry technology, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, and other chemical processes, can solve the problems of occupying abandoned land or fertile land, affecting the ecological environment, etc., and achieve good adsorption, The effect of lower concentration and higher phosphorus removal rate

Inactive Publication Date: 2011-02-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most steel slags are piled up after iron selection and are not used. Iron tailings are also the main component of solid waste in the iron and s

Method used

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  • Method for adsorbing phosphorus pollutants in water by using waste residues in iron and steel industry
  • Method for adsorbing phosphorus pollutants in water by using waste residues in iron and steel industry
  • Method for adsorbing phosphorus pollutants in water by using waste residues in iron and steel industry

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A method for utilizing iron and steel industry waste slag to adsorb phosphorus pollutants in water, comprising the steps of:

[0026] 1) Crush the steel slag to 5-10 mesh, wash it with distilled water, dry it, and set aside; grind the iron tailings to 200 mesh, set aside;

[0027] Then according to the mass percentage of each raw material: steel slag 50%, iron tailings 40%, binding agent 10%, select steel slag, iron tailings and binding agent, mix, obtain composite material, standby; The agent is water glass, and the modulus of water glass is 1.5 to 3.5;

[0028] 2) Spread the composite material in a container (such as a large ash dish) and put it into a high-temperature resistance furnace for roasting, raise the temperature to 100°C at 6°C / min (slowly), keep it warm for 60min, and let the physical moisture in the composite material (raw meal) evaporate ; Then raise the temperature to 750°C at 11°C / min, keep it warm for 1.2h, and cool down to room temperature naturally...

Embodiment 2

[0059] A method for utilizing iron and steel industry waste slag to adsorb phosphorus pollutants in water, comprising the steps of:

[0060] 1) Crush the steel slag to 5-10 mesh, wash it with distilled water, dry it, and set aside; grind the iron tailings to 200 mesh, set aside;

[0061] Then according to the mass percentage of each raw material: steel slag 45%, iron tailings 45%, binding agent 10%, select steel slag, iron tailings and binding agent, mix, obtain composite material, standby; The agent is cement;

[0062] 2) Spread the composite material in a container (such as a large ash dish) and put it into a high-temperature resistance furnace for roasting, raise the temperature to 100°C at 4°C / min (slowly), keep it warm for 60 minutes, and let the physical moisture in the composite material (raw meal) evaporate ;Then raise the temperature to 700°C at 12°C / min, keep it warm for 1h, and cool down to room temperature naturally to obtain the adsorption material;

[0063] 3) ...

Embodiment 3

[0065] A method for utilizing iron and steel industry waste slag to adsorb phosphorus pollutants in water, comprising the steps of:

[0066] 1) Crush the steel slag to 5-10 mesh, wash it with distilled water, dry it, and set aside; grind the iron tailings to 200 mesh, set aside;

[0067] Then according to the mass percentage of each raw material: steel slag 55%, iron tailings 35%, binding agent 10%, select steel slag, iron tailings and binding agent, mix, obtain composite material, standby; The agent is water glass, and the modulus of water glass is 1.5 to 3.5;

[0068] 2) Spread the composite material in a container (such as a large ash dish) and put it into a high-temperature resistance furnace for roasting, raise the temperature at 8°C / min (slowly) to 100°C, and keep it warm for 60 minutes to allow the physical moisture in the composite material (raw meal) to evaporate ; Then raise the temperature to 750°C at 10°C / min, keep it warm for 1.5h, and cool down to room temperatu...

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Abstract

The invention relates to a method for adsorbing phosphorus pollutants in water, in particular a method for adsorbing phosphorus pollutants in water by using waste residues in the iron and steel industry. The method is characterized by comprising the following steps of: 1) crushing slag to 5 to 10 meshes, washing by using distilled water and drying for later use; grinding iron tailings to 200 meshes for later use; and mixing the following raw materials in percentage by mass: 45 to 55 percent of slag, 35 to 45 percent of iron tailings and 5 to 15 percent of binder so as to prepare a composite material for later use; 2) laying the composite material in a container, calcining in a high-temperature resistance furnace, raising the temperature to 100 DEG C at a speed of 4-8DEG C per minute, keeping the temperature for 60 minutes, raising the temperature to between 700 and 800 DEG C at a speed of 10-12DEG C per minute, keeping the temperature for 1 to 1.5 hours, and naturally cooling to room temperature so as to prepare an adsorbing material; and 3) adding the adsorbing material into wastewater with the phosphorus content of less than 30mg/L according to a ratio of 1-1.5g/100mL, regulating the pH value of the wastewater to 7 to 9, and reacting with full mixing to remove over 98 percent of phosphorus from the wastewater. In the method, the waste residues in the iron and steel industry are better utilized to realize treatment of wastes with wastes, and the phosphorus-removing rate is high.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of iron and steel industry waste slag, in particular to a method for absorbing phosphorus pollutants in water with a composite material synthesized from iron and steel industry waste slag. Background technique [0002] Steel slag (ie iron and steel industry waste slag) is one of the by-products of the steelmaking process, and its yield is about 10% to 20% of the crude steel. According to statistics, my country currently produces about 55 million tons of steel slag every year. Most of the steel slag is piled up after iron selection and is not used. Iron tailings are also the main part of solid waste in the iron and steel industry. Both of them not only occupy a large amount of waste land or fertile land, but also seriously affect the ecological environment. [0003] With the rapid growth of my country's steel output, more and more attention has been paid to the waste treatment and reuse in...

Claims

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Application Information

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IPC IPC(8): B01J20/02C02F1/28
Inventor 李晔胡斌佘健马啸
Owner WUHAN UNIV OF TECH
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