Iron-manganese composite chromium-removal material and preparation method thereof

A composite material, iron-manganese technology, applied in the direction of chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve the problems of complex development, high process, cost obstacles, etc., to achieve a wide range of pH adaptation, short production cycle, Inexpensive effect

Inactive Publication Date: 2020-02-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods also have some disadvantages; in fact, thei

Method used

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  • Iron-manganese composite chromium-removal material and preparation method thereof
  • Iron-manganese composite chromium-removal material and preparation method thereof
  • Iron-manganese composite chromium-removal material and preparation method thereof

Examples

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Embodiment 1

[0021] The iron-manganese composite chromium removal material of the present invention treats heavy metal ion Cr(VI) in water, comprising the following steps:

[0022] Preliminary crushing of natural pyrite and rhodochrosite, the crushed particle size is 0.5 cm, and then the minerals are ground into fine powder, passed through a 325 mesh sieve, and then the pyrite and rhodochrosite are ground according to the mass ratio of 1:1 Mix evenly to obtain the iron-manganese mineral complex; place the iron-manganese mineral complex in an atmosphere with hydrogen as the reducing atmosphere and argon as the protective gas at 500°C for 2 hours, the control gas flow rate is 150 mL / min, and the heating rate is 20 °C / min. The temperature is naturally lowered, and the roasted powdered composite material is collected to obtain the iron-manganese composite material for chromium removal. Take 0.05g of the composite material, respectively place the initial concentration of 30 / 80 / 150 / 250 / 350 / 450 / ...

Embodiment 2

[0024] The iron-manganese composite chromium removal material of the present invention treats heavy metal ion Cr(VI) in water, comprising the following steps:

[0025] The natural pyrite and rhodochrosite are preliminarily crushed, the crushed particle size is 0.5cm, and then the minerals are ground into fine powder, passed through a 325 mesh sieve, and then the pyrite and rhodochrosite are ground according to the mass ratio of 1:2 Mix evenly to obtain the iron-manganese mineral complex; place the iron-manganese mineral complex in an atmosphere with hydrogen as the reducing atmosphere and argon as the protective gas at 500°C for 2 hours, the control gas flow rate is 150 mL / min, and the heating rate is 20 °C / min. During the natural cooling process, the roasted powdered composite material is collected to obtain the iron-manganese composite material for chromium removal. Take 0.05g of the composite material, respectively place the initial concentration of 30 / 80 / 150 / 250 / 350 / 450 / 5...

Embodiment 3

[0027] The iron-manganese composite chromium removal material of the present invention treats heavy metal ion Cr(VI) in soil, comprising the following steps:

[0028] Preliminary crushing of natural pyrite and rhodochrosite, the crushed particle size is 0.5 cm, and then the minerals are ground into fine powder, passed through a 325 mesh sieve, and then the pyrite and rhodochrosite are ground according to the mass ratio of 1:1 Mix evenly to obtain the iron-manganese mineral complex; place the iron-manganese mineral complex in an atmosphere with hydrogen as the reducing atmosphere and argon as the protective gas at 500°C for 2 hours, the control gas flow rate is 150 mL / min, and the heating rate is 20 °C / min. During the natural cooling process, the roasted powdered composite material is collected to obtain the iron-manganese composite material for chromium removal. Add a concentration of 2.5g / kg evenly into 150mg / kg of Cr(VI)-contaminated soil samples, and keep the soil at a cer...

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Abstract

The invention relates to an iron-manganese composite chromium-removal material and a preparation method thereof, and belongs to the technical field of environmental materials. According to the preparation method, under the regulation and control of a heating and reducing gas atmosphere, uniformly mixing iron and manganese minerals according to a certain proportion; the prepared iron-manganese composite material with high adsorption capacity can solidify heavy metal chromium Cr (VI) in water and soil, and has the characteristics of high adsorption capacity, wide pH application range, high stability, high oxidation-reduction activity, environment friendliness, strong and long lasting solidification effect and the like. The preparation method of the novel chromium removal material is simple,green and economical, and the application prospect in the aspects of purification treatment of Cr (VI)-containing wastewater and remediation of Cr (VI) contaminated soil is promising.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, in particular to an iron-manganese composite material for removing chromium and a preparation method thereof. Background technique [0002] Chromium (Cr) is widely used in industrial processes such as textile printing and dyeing, tanning, electroplating, and wood preservation. Chromium is frequently detected in groundwater, surface water, and soil due to its solubility, persistence, and bioaccumulation. Cr has multiple oxidation states in the environment, among which the most common and stable forms are Cr(III) and Cr(VI) species, which exhibit distinct properties. For example, including HCrO 4 and Cr 2 o 7 2- The Cr(VI) contained in it is soluble and highly mobile in water, and Cr(VI) is one of the most toxic heavy metals, which can cause vomiting, lung congestion, liver damage and respiratory diseases. In contrast, Cr(III) is much less toxic in natural aquatic environment...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/28B01J20/30C02F1/28B09B3/00C02F101/22
CPCB01J20/0229B01J20/0222B01J20/28009B01J20/3021B01J20/3078C02F1/281C02F2101/22B09B3/10
Inventor 朱建裕甘敏陈耀宗何鹏陈芳章可朱敬磊刘梦飞王旭
Owner CENT SOUTH UNIV
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