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Steel slag composition for removing divalent cadmium ion and its production method and uses

A technology for removing cadmium ions and water, which is applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of insignificant environmental benefits, low adsorption performance, complicated operation steps, etc. The burden of land costs and environmental protection sewage charges, easy solid-liquid separation, and the effect of simplifying the operation link

Inactive Publication Date: 2007-07-11
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a steel slag composition for removing divalent cadmium ions in water and its preparation method and application, so as to overcome the low adsorption performance, complicated operation steps and easy poisoning of existing cadmium-containing wastewater treatment materials Effect, high price, and insignificant environmental benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Pretreatment of steel slag

[0034] Industrial waste steel slag (containing 30% to 50% by weight of CaO, 10% to 30% of SiO 2 and 5% to 40% Fe 2 o 3 and the remaining impurities) at 60°C-110°C for 24-72 hours or burnt, after taking it out, pass through a 20-200 mesh sieve, and store it in an oven at 60°C-90°C for future use.

Embodiment 2

[0036] Treatment of divalent cadmium aqueous solution with pretreated steel slag

[0037] Prepare 100mL of 10mg / L divalent cadmium aqueous solution with analytically pure cadmium nitrate, put 4g of steel slag into it, vibrate with a shaker for 45 minutes at a speed of 200 rpm, then magnetically stir for 330 minutes at a speed of 600 rpm, and then carry out Filtrate, get filtrate and carry out flame atomic absorption analysis wherein divalent cadmium ion content, experimental result, the concentration of divalent cadmium ion drops to 5mg / L by 10mg / L, promptly removal rate is 50%.

Embodiment 3

[0039] Prepare 100mL of 10mg / L divalent cadmium aqueous solution with analytically pure cadmium nitrate, add hydrochloric acid to adjust the pH value to 2, put in 10g of steel slag, stir with magnetic force for 300 minutes at a speed of 1000 rpm, then filter, and take the filtrate for flame atomic absorption The divalent cadmium ion content was analyzed therein. As a result of the experiment, the concentration of the divalent cadmium ion was reduced from 10 mg / L to 4 mg / L, that is, the removal rate was 60%.

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Abstract

The invention discloses a steel slag composition removing method of bivalent cadmium ion and application, wherein the steel slag comprises the following parts: 30%-50% CaO,10%-30% SiO2 and 5%-40% Fe2O3.

Description

technical field [0001] The invention belongs to the technical field of environmental protection materials, in particular to a steel slag composition for removing divalent cadmium ions in water. Background technique [0002] Non-ferrous metals, electroplating, chemical industry, printing and dyeing, mining and other industries discharge a large amount of wastewater containing heavy metal ions every year. Because heavy metals are not degradable in the environment, they can only undergo mutual transformation, dispersion and enrichment between forms, and they are easy to transfer enrichment along the biological chain, and finally enter the human body from aquatic products, endangering human health. Therefore, heavy metal elements are a major pollutant and the main object of environmental monitoring and governance. Among them, cadmium is a representative heavy metal element, and its divalent ions are highly toxic. If the human body ingests more water containing divalent cadmium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/28
Inventor 何其庄沈敬一徐燕鸣周玲
Owner SHANGHAI NORMAL UNIVERSITY
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