Boric sludge comprehensive utilization method for preparing nanometer magnesia and nanocrystalline iron oxide

A nano-iron oxide and nano-magnesium oxide technology, applied in the nano field, can solve the problems of complex process, non-conformity and high energy consumption, and achieve the effects of increasing added value, reducing exhaust emissions and saving energy.

Active Publication Date: 2013-07-24
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The above methods all have technical defects such as complex process, high energy consumption, and large pollution, and do not meet the requirements of the national medium and long-term development plan to vigorously develop circular economy.

Method used

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  • Boric sludge comprehensive utilization method for preparing nanometer magnesia and nanocrystalline iron oxide
  • Boric sludge comprehensive utilization method for preparing nanometer magnesia and nanocrystalline iron oxide
  • Boric sludge comprehensive utilization method for preparing nanometer magnesia and nanocrystalline iron oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The XRD of boron mud used is attached figure 1 As shown, it is mainly composed of magnesium carbonate, magnesium silicate, iron silicate, iron oxide and other phases, and its chemical composition is shown in Table 1.

[0031] Table 1 Chemical composition of boron mud / mass%

[0032] composition B 2 o 3 MgO CaO SiO 2 Fe 2 o 3 Al 2 o 3 content 2.5 35 5 18 25 2

[0033] (1) Carry out low-temperature pressure leaching of boron mud in hydrochloric acid system, and then filter and separate to obtain magnesium chloride, ferric chloride leachate and borosilicate-rich slag. The low-temperature pressure leaching conditions are: the solid-to-liquid ratio of boron mud to hydrochloric acid is 1kg: 5L, the leaching temperature is 120°C, the concentration of hydrochloric acid is 8mol / L, the leaching time is 30min, and the leaching rates of magnesium and iron are 95.5% and 95.2% respectively;

[0034] (2) Add MgO or Fe to the magnesium ...

Embodiment 2

[0039] Boron mud used is with embodiment 1.

[0040] (1) Carry out low-temperature pressure leaching of boron mud in hydrochloric acid system, and then filter and separate to obtain magnesium chloride, ferric chloride leachate and borosilicate-rich slag. The low-temperature pressure leaching conditions are: the solid-to-liquid ratio of boron mud to hydrochloric acid is 1kg: 10L, the leaching temperature is 100℃, the concentration of hydrochloric acid is 5mol / L, the leaching time is 90min, and the leaching rates of magnesium and iron are 96.5% and 95.5% respectively;

[0041] (2) Add MgO or Fe to the magnesium chloride and ferric chloride leaching solution obtained in step (1) 2 o 3 Adjust the pH value of the leaching solution to 3.2. In order to effectively precipitate and separate iron, add H during the precipitation process. 2 o 2 Oxidize the ferrous ions in the leach solution to ferric ions, precipitate the iron ions in the form of ferric hydroxide, and then filter and s...

Embodiment 3

[0046] Boron mud used is with embodiment 1.

[0047] (1) Carry out low-temperature pressure leaching of boron mud in hydrochloric acid system, and then filter and separate to obtain magnesium chloride, ferric chloride leachate and borosilicate-rich slag. The low-temperature pressure leaching conditions are: the solid-to-liquid ratio of boron mud to hydrochloric acid is 1kg: 15L, the leaching temperature is 80°C, the concentration of hydrochloric acid is 3mol / L, the leaching time is 60min, and the leaching rates of magnesium and iron are 97.5% and 96.2% respectively;

[0048] (2) Add MgO or Fe to the magnesium chloride and ferric chloride leaching solution obtained in step (1) 2 o 3 Adjust the pH value of the leaching solution to 3.5. In order to effectively precipitate and separate iron, add H during the precipitation process. 2 o 2 Oxidize the ferrous ions in the leach solution to ferric ions, precipitate the iron ions in the form of ferric hydroxide, and then filter and s...

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Abstract

The invention belongs to the field of nanometer technology, and particularly relates to a boric sludge comprehensive utilization method for preparing nanometer magnesia and nanocrystalline iron oxide. The boric sludge comprehensive utilization method is carried out according to the following steps of: pressing and leaching boric sludge in a hydrochloric acid system at a low temperature; filtering and separating to obtain magnesium chloride and ferric chloride leachate and borosilicate-rich residue; adding MgO or Fe2O3 to the magnesium chloride and ferric chloride leachate to adjust the pH (Potential Of Hydrogen) of the leachate; adding H2O2 to oxidize bivalent ferrous ions in the leachate into ferric ions during precipitating, in order to precipitate and separate the iron ions in the leachate in a form of ferric hydroxide; filtering and separating to obtain an Fe(OH)3 precipitate and a magnesium chloride solution; roasting the obtained Fe(OH3) precipitate to obtain Fe2O3 powder; and directly pyrolyzing the obtained magnesium chloride solution, thus obtaining the nanometer MgO powder and a hydrochloric acid solution, wherein the hydrochloric acid solution can be returned to be recycled. The boric sludge comprehensive utilization method has high leaching efficiency, enables the leaching time to be reduced, saves the energy, reduces the exhaust emission, realizes non-waste clean production in the whole process, and is a novel typical green and clean production process.

Description

[0001] technical field [0002] The invention belongs to the field of nanotechnology, and in particular relates to a comprehensive utilization method of boron mud for preparing nano magnesium oxide and nano iron oxide. Background technique [0003] Boron sludge is the solid waste discharged from the process of producing boric acid and borax and other boron products by using boron-magnesium minerals or boron-iron minerals in industry, and its color is light brown or off-white. In recent years, with the extensive use of boron compounds such as boric acid, borax, and boron alloys, the output of boron products in my country has increased at a rate of 6% to 7% per year, while the grade of boron-magnesium ore has declined year by year, resulting in an average boron product per ton ( with B 2 o 3 The amount of boron mud produced increases from 3 to 4 tons to 4 to 5 tons, resulting in a daily increase in boron mud emissions. By the end of 2011, the total amount of boron mud stockp...

Claims

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Application Information

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IPC IPC(8): C01F5/02C01G49/06B09B3/00
Inventor 张廷安豆志河南嘉良刘燕范世钢吕国志杜承天赵秋月杨瑞赫冀成
Owner NORTHEASTERN UNIV
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