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Method for removing metal ions in water by utilizing magnetically-separated steel slag tailings

A technology of metal ions and heavy metal ions, applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of high treatment cost and limitations, and achieve good sedimentation performance, easy to master, and treatment effect. stable effect

Inactive Publication Date: 2014-01-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many methods for treating heavy metal ions in water, such as: biotechnology repair method, chemical precipitation method, adsorption method, ion exchange method, adsorption flocculation method, etc., but because the treatment costs of these methods are generally high, they are not suitable for actual wastewater Treatment is limited, so it is urgent to find an economical and practical water treatment material

Method used

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  • Method for removing metal ions in water by utilizing magnetically-separated steel slag tailings
  • Method for removing metal ions in water by utilizing magnetically-separated steel slag tailings
  • Method for removing metal ions in water by utilizing magnetically-separated steel slag tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Weigh 0.2g of steel slag tailings powder with a particle size of 90-150 mesh, add 200ml of pH neutral cadmium-containing solutions of different concentrations, put it in a constant temperature shaker, and keep it at a temperature of 25°C and a speed of 150r / min. Samples were taken after 24 h of reaction. After the water sample was precipitated for 30 minutes, it was filtered to measure the concentration of cadmium in the water. The concentration of cadmium was measured by atomic absorption spectrophotometer, and the treatment effect is shown in the attached figure 1 , where the adsorption capacity of tailings for cadmium ions in water increases with the increase of the initial concentration, and the maximum adsorption capacity is about 150mg / g.

Embodiment 2

[0025] Example 2: Weigh 1 g of steel slag tailings powder with a particle size of 90-150 mesh, add 1000 ml of pH neutral cadmium-containing solution with a concentration of 100 mg / L, mix under the condition of a constant temperature magnetic stirrer, and take samples at different times. The water sample was centrifuged at 4000r / min for 10 minutes, and then filtered to measure the concentration of cadmium in the water. The concentration of cadmium was measured by atomic absorption spectrophotometer, and the treatment effect is shown in the attached figure 2 , it can be seen from the figure that when the reaction time is longer than 1h, the removal effect is better and remains stable.

Embodiment 3

[0026] Example 3 : Weigh the steel slag tailings powder with different weight and particle size of 90~150 mesh, that is, add 100ml concentration of 100mg / L pH neutral cadmium-containing solution with different dosing ratios, put it in a constant temperature shaker, Samples were taken after reacting for 24 hours at 25°C with a rotational speed of 150r / min. After the water sample was precipitated for 60 minutes, it was filtered to measure the concentration of cadmium in the water. The concentration of cadmium is measured by atomic absorption spectrophotometer, and the treatment effect is shown in the attached image 3 , it can be seen from the figure that at a certain concentration, there is an optimal dosage ratio.

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Abstract

The invention discloses a method for removing metal ions in water by utilizing magnetically-separated steel slag tailings. The method for removing heavy metal ions from waste water by utilizing magnetically-separated steel slag tailings containing less iron content comprises the steps of grinding, drying and screening the magnetically-separated steel slag tailings, and then placing into a reactor; adding waste water (containing heavy metal ions) into the reactor, and fully mixing; and separating solid from liquid to obtain tailings, and treating to discharge water. According to the method, as a material for water treatment, the magnetically-separated steel slag tailings is low in cost, wide in sources and large in specific weight, thus being convenient to recycle, and having less possibility of causing secondary pollution. In addition, the steel slag tailings belong to solid waste, thus achieving the purpose of treating wastes with wastes after being applied into waste water treatment, and having excellent economic and environment-friendly benefits.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment and solid waste resource utilization, and relates to a technology for treating heavy metal ion wastewater by using steel slag tailings after magnetic separation. Background technique [0002] In recent years, with the development of society, heavy metal pollution has become a sharp sword brought by social development that cannot be ignored, deeply affecting the research and development direction of environmental protection, especially water environmental protection. Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds. Heavy metal ions mainly come from non-ferrous smelting, electroplating, chemical industry, printing and dyeing, mining and other industries, and after being discharged into the environment as pollutants, they cannot be degraded by microorganisms, but can only undergo mutual transformation, dispersion and enrichment between f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62
Inventor 安立超惠咏薇
Owner NANJING UNIV OF SCI & TECH
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