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Li X.,Shenyang University of Chemical Technology | Zhang Y.,Shenyang University of Chemical Technology | Jin Z.,Key Laboratory of Applied Technology for Chemical Engineering of Liaoning Province | Chang P.,Key Laboratory of Applied Technology for Chemical Engineering of Liaoning Province | Liu Y.,Key Laboratory of Applied Technology for Chemical Engineering of Liaoning Province
Advanced Powder Technology | Year: 2016

Magnesium oxide (MgO) with different morphology were prepared by calcining precursors (magnesium hydroxide MH). The precursors were synthesized from industry lightly calcined powder (MgO content of 80-93%) by ammonia circulation method. The structures of MH and MgO were characterized by scanning electron microscope and laser particle size analyzer. The crystal growth mechanism of MgO precursors were simulated by materials studio. The experimental results showed that the MgO had the same morphology with their precursors. The adsorption of SO4 2- can significantly increase the particle size of precursors, and its D50 reached 2.05μm. After adsorping Cl-, the exposure proportion of planes (001) and (101) was reduced, and the morphology of MH more easily grow to be uniform bulk crystal. The activity of MgO (CAA) produced with MgCl2 was 15″85 by the citric acid method, which was higher than other MgO produced with Mg(NO3)2 and MgSO4. © 2016.


Li X.,Shenyang University of Chemical Technology | Li X.,Key Laboratory of Applied Technology for Chemical Engineering of Liaoning Province | Shi T.,Shenyang University of Chemical Technology | Shi T.,Key Laboratory of Applied Technology for Chemical Engineering of Liaoning Province | And 8 more authors.
Powder Technology | Year: 2014

Lamellar magnesium hydroxide (MH) with a purity of 99.5% was synthesized using industry lightly calcined powder as raw material and ammonium salt solution as circulating mother liquid by ammonia circulation method. The structures and morphologies of MH were characterized by X-ray diffraction, scanning electron microscope, laser particle size analyzer and thermo gravimetric analysis. The experimental results showed that the hexagonal flake MH products were about 0.86μm in mean particle size (D50) and nanometers in thickness, and were loose enough for filtering. The BET surface area was about 8m2{bullet operator}g-1, indicating that the products can be applied as additives of the macromolecule compounds. The diffraction intensity of the (001) direction was higher than that of the (101) direction and the decomposition temperature of products was about 400°C. © 2014 Elsevier B.V.


Guo H.,Shenyang University of Chemical Technology | Guo H.,Key Laboratory of Applied Technology for Chemical Engineering of Liaoning Province | Xie J.,Shenyang University of Chemical Technology | Hu H.,Shenyang University of Chemical Technology | And 7 more authors.
Industrial and Engineering Chemistry Research | Year: 2013

A process using plentiful and inexpensive caustic calcined magnesia (CCM; main component is MgO) to prepare lamellar MH of high purity is described. The process begins with the reaction of MgO in CCM with NH4NO3 at ∼100 C to produce ammonia gas and Mg(NO3)2 solution and the subsequent filtration of Mg(NO3)2 solution to remove impurities (e.g., SiO2). Then, the obtained ammonia is introduced into the Mg(NO3)2 solution to produce MH precipitate and NH4NO3. After the MH precipitate is separated by filtration, the filtrate containing NH 4NO3 is returned to the initial step. The overall reaction of this process is the hydration of MgO to MH. Therefore, this process is called the apparent-hydration method. This apparent-hydration method overcomes the disadvantages of the true hydration method, such as the inability to remove impurities. A crucial finding is that, because of the presence of trace SO 4 2- in the obtained Mg(NO3)2 solution, a MH product with a narrow particle size distribution cannot be produced. After removal of the SO4 2- with Ba(NO 3)2, lamellar MH with a narrow particle size distribution can be synthesized at 120 C in one step. This work provides a promising route to the use of CCM to prepare MH. © 2013 American Chemical Society.


Guo H.,Shenyang University of Chemical Technology | Guo H.,Key Laboratory of Applied Technology for Chemical Engineering of Liaoning Province | Hu H.,Shenyang University of Chemical Technology | Xie J.,Shenyang University of Chemical Technology | And 4 more authors.
RSC Advances | Year: 2014

Aqua ammonia (AA) is frequently used to precipitate various metal hydroxide or oxide particles. Here, we replace AA with gaseous ammonia (GA) to precipitate Mg(OH)2 particles in MgCl2 aqueous solution under mild conditions. The results show that GA can give a higher consistency in the growth of Mg(OH)2 particles although both AA and GA essentially produce Mg(OH)2 by the reaction of Mg2+ with OH -. This work provides results that suggest using ammonia as a precipitant. © 2014 the Partner Organisations.


Guo H.,Shenyang University of Chemical Technology | Guo H.,Key Laboratory of Applied Technology for Chemical Engineering of Liaoning Province | Lin J.,Shenyang University of Chemical Technology | Yang Y.,Shenyang University of Chemical Technology | And 2 more authors.
Fuel | Year: 2014

The effect of the minerals of Huadian oil shale on a low-energy input retorting route was studied. This special retorting route was achieved by a self-heating effect, that is, spontaneously increasing retorting temperature in the absence of external heat provision (Guo et al., 2013) [12]. Oil shale was first demineralized with HCl, HNO3 or HF before used in the self-heating retorting. The oil shales treated with different acids, and their corresponding semicokes attained after retorting were also characterized. The results showed that using HF-treated oil shale produces the best self-heating effect and the highest oil yield. Using HNO3-treated oil shale also promotes the self-heating effect. While using HCl-treated oil shale remarkably worsens the self-heating effect, but it gives a higher oil yield than using HNO3-treated or raw oil shale. The reasons are also analyzed. Although different acid treatments affect the self-heating effect differently, all the attained oils mainly consist of various hydrocarbons, however, the product distributions are different. © 2013 Elsevier Ltd. All rights reserved.

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