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Water treatment agent prepared by blast furnace slag and preparation method thereof

A technology of water treatment agent and treatment method, which is applied in adsorption water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of high energy consumption and low lead adsorption treatment rate, and achieves large and good adsorption capacity. Sewage purification effect, low cost effect

Active Publication Date: 2011-04-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, as described in Document 1: Water Research.2000.34:1957-1961, S.V.DIMITROVA, "INTERACTION OF BLAST-FURNACE SLAG WITH HEAVYMETAL IONS IN WATER SOLUTIONS", granulated blast furnace slag and annealed The blast furnace slag adsorbed copper ions respectively, and the results showed that in 10 -3 The removal rate of blast furnace slag in mol / L copper ion solution is 35.4%, and the removal rate of copper ion by annealed blast furnace slag can reach more than 99%. Keep warm for 3 hours at 800°C
[0006] In Document 2: Water Research.2002.36:4001-4008, S.V.DIMITROVA, "Use of granular slag columns for lead removal" further discloses the use of granular blast furnace slag to adsorb lead ions. When the lead ion content is 20mg / L, The saturated adsorption capacity is only 10.02mg / g, and the adsorption treatment rate for lead is relatively low

Method used

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  • Water treatment agent prepared by blast furnace slag and preparation method thereof
  • Water treatment agent prepared by blast furnace slag and preparation method thereof

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Embodiment 1

[0029] Embodiment 1, prepare water treatment agent 1 of the present invention

[0030] 200g blast furnace slag (SiO 2 : 25%; CaO: 45%; Al 2 o 3 : 20%; MgO: 10%) in 400g of alkaline solution (KOH aqueous solution, pH = 14) according to the mixing, then soaked for 2h, filtered, then rinsed with distilled water, filtered, repeated 2 times, the filter residue at 80 ℃ Dry for 48 hours, take it out; pulverize the obtained filter residue, and pass through a standard sieve of 80m but not more than 300m to obtain the required water treatment agent I.

Embodiment 2

[0031] Embodiment 2, prepare water treatment agent II of the present invention

[0032] 200g blast furnace slag (SiO 2 : 25%; CaO: 40%; Al 2 o 3 : 15%; MgO: 20%) in 200g alkaline solution (NaO·3SiO 2 and KOH mixed aqueous solution (pH = 14) according to the mixed uniformity, then soaked for 2 hours, filtered, then rinsed with distilled water, filtered, repeated twice, the filter residue was dried at 60 ° C for 36 hours, taken out; the obtained filter residue was crushed, passed through 30m, However, the standard sieve of 80m was used to obtain the required water treatment agent II.

Embodiment 3

[0033] Embodiment 3, prepare water treatment agent III of the present invention

[0034] 200g blast furnace slag (SiO 2 : 30%; CaO: 42%; Al 2 o 3 : 17%; MgO: 11%) in 1000g alkaline solution (Ca(OH) 2 aqueous solution, pH=12.55) according to the mixing method, then soaked for 5h, filtered, then rinsed with distilled water, filtered, repeated twice, the filter residue was dried at 120°C for 24h, and taken out; the obtained filter residue was crushed and passed through a 40m standard sieve to obtain Required water treatment agent III.

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Abstract

The invention relates to a water treatment agent prepared by utilizing blast furnace slag, and the agent is obtained by treating blast furnace slag by alkaline solution. The blast furnace slag comprises: 25-30% of SiO2, 40-45% of CaO, 15-20% of Al2O3, 10-20% of MgO, 1.08-1.5 of (CaO+MgO) / (Al2O3+SiO2). The alkaline solution with pH of more than 11 are mixed with the blast furnace slag as per 1 : 1-5 of the solid-to-liquid ratio, dried for 24-48h at 50-120 DEG C after filtration, and the outcome is taken out, smashed and passes through a standard filter of 6-80 m. The improved blast furnace slag is used as the water treatment agent and can treat the sewage with high efficiency and large amount, especially for the sewage containing the ions such as Ni(II), Pb(II), Cu(II), Zn(II), Mn(II), Fe(III), Al(III), Cr(III), etc.

Description

field of invention [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a water treatment agent prepared from blast furnace slag and a preparation method thereof. Background technique [0002] my country is a country that lacks water resources. With the continuous exploitation of groundwater, the water level continues to drop, which exacerbates the shortage of water resources. To solve the shortage of water resources, the protection of water resources has become a top priority. The recycling and reuse of water resources is a very promising cause, which can alleviate the shortage of water resources. The recycling and reuse of water resources is to carry out deep purification treatment of domestic sewage and industrial sewage to make them meet certain water quality requirements. The treated effluent can be used for irrigation, washing, landscape industrial circulating water, etc., which can save a lot of water. of tap water. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/52
Inventor 叶树峰倪建娣魏连启陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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