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Iron and manganese composite oxide arsenic removing material as well as preparation method and application method thereof

A technology of composite oxides and oxides, applied in chemical instruments and methods, separation methods, water pollutants, etc., can solve the problems of high concentration of iron ions in water, loss of ability to adsorb arsenic, etc., and achieve the effect of reducing costs

Active Publication Date: 2016-06-29
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, zero-valent iron has been used to remove arsenic in groundwater permeable walls, but with the reaction of zero-valent iron and water, it gradually loses the ability to absorb arsenic through passivation, and there is still a problem of excessive iron ion concentration in water.

Method used

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  • Iron and manganese composite oxide arsenic removing material as well as preparation method and application method thereof
  • Iron and manganese composite oxide arsenic removing material as well as preparation method and application method thereof
  • Iron and manganese composite oxide arsenic removing material as well as preparation method and application method thereof

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Embodiment 1

[0027] Now take the laboratory simulation test as an example, and the non-limiting embodiments are described as follows:

[0028] Select natural iron-manganese oxide ore as raw material (such as figure 1 shown), wherein the content of goethite is 60%, the crystal diameter is 20-80nm, the content of manganese oxide mineral is 18%, and the crystal diameter is 10-70nm (such as figure 2 shown);

[0029] Crush and sieve the iron-manganese oxide ore to obtain particles with a particle size of 0.5-1mm;

[0030] Calcinate the above particles at 350°C for 10 minutes in the air to transform the goethite phase into hematite, and obtain the iron-manganese composite oxide arsenic removal material composed of nano-hematite and nano-manganese oxide (such as image 3 shown).

[0031] The iron-manganese composite oxide arsenic-removing material is packed into a filter column with a diameter of 10 mm as a filter material, and the packing height is 45 cm. According to the hydraulic retentio...

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Abstract

The invention discloses an iron and manganese composite oxide arsenic removing material as well as a preparation method and an application method thereof. The arsenic removing material is characterized in that the arsenic removing material is a composite material composed of nano hematite and nano manganese oxide, and is prepared by taking natural iron and manganese oxide ores as raw materials through the steps of crushing, sieving and calcining at 250-550 DEG C; the arsenic removing material has a nano-micron multi-graded pore structure; and the material is used as a filter material and is contained in a filter column or a filter tank and is used for treating arsenic-containing underground water, so that arsenic can be removed. The iron and manganese composite oxide arsenic removing material disclosed by the invention is used for removing the arsenic in the water; the content of arsenic ions in output water can be smaller than 0.01mg / L, the removing rate is stabilized to be more than or equal to 97%, and the water quality of the output water reaches the water quality standards of drinking water; and the nano hematite and nano manganese oxide used as the filter material can be regenerated and repeatedly utilized so that the cost is remarkably reduced.

Description

1. Technical field [0001] The invention belongs to the field of drinking water treatment, and in particular relates to a method for removing arsenic from underground water containing excessive arsenic. 2. Background technology [0002] Arsenic is very harmful to human health and is one of the carcinogens that require strict control of intake. Drinking water is an important intake source of arsenic, so all countries in the world have revised the standard of arsenic in drinking water to 0.01mg / L. According to this standard, about 30% of the groundwater of drinking water sources in the world needs to be treated for arsenic removal. The content of arsenic in groundwater drinking water sources in my country's Inner Mongolia, Xinjiang, Shanxi, Taiwan and other places is as high as 0.2-2.0mg / L. In Qinghai, Gansu, Shaanxi, Henan, Huaibei, Anhui, northern Jiangsu, Shandong and other places, the arsenic content in groundwater exceeded the drinking water standard. [0003] Arsenic i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30B01J20/34C02F1/28C02F101/10
CPCB01J20/06B01J20/3433B01J20/3475C02F1/281C02F2101/103
Inventor 陈天虎皮汇钰刘海波张羽
Owner HEFEI UNIV OF TECH
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