Abstract. Catalytic upgrading was applied to the liquid product obtained from biomass fast pyrolysis (raw bio-oil) in a continuous reaction system by using dolomite as a low-cost catalyst. The upgrading reactor operates at atmospheric pressure without external H 2 supply and consists of a thermal treatment section, where pyrolytic lignin is ...

The purpose of these treatments is to optimize the performance and encapsulation effect of the SSM to ensure the stability and efficiency of the energy storage process. Dolomite is a mineral composed of a solid solution of calcium and magnesium carbonate and is abundantly distributed worldwide [30].

Step 1: Turn Large stones into small stones. Transport the bulk dolomite raw material into the jaw crusher by the vibrating feeder for the coarse crushing process, and then send it to the cone crusher for medium to fine crushing processing until it reaches the feed fineness of the grinding machine (15-40mm) before discharge.. Step 2: Grind …

Due to the continued Mg 2+ loss during advanced stage of the dolomitization process, the dolomitizing fluid will approach the dolomite–calcite–water three-phase equilibrium and pass a kinetic threshold below which dolomite precipitation is significantly limited while dissolution rates of calcite remain relatively rapid (Machel, 2004 ...

The authors used density function theory (electronic structure calculations used to compute a variety of properties) and kinetic Monte Carlo crystal growth …

In addition, in the calcination stage, the energy consumption of the VCTRM process has been significantly reduced (0.396 tce vs. 1.529 tce of the Pidgeon process) as shown in Table 6, which is linked with (i) the less demand of ore (4.325 t of magnesite vs. 10.335 t of dolomite) and (ii) lower calcination temperature (1023–1123 K vs. 1323 ...

Because of its high energy consumption, great technical difficulties, and serious corrosion of equipment in the dehydration process, the cost is far higher than that of the Pidgeon process. 8 The Pidgeon process is a technology that uses dolomite as the raw material and ferrosilicon as the reductant to reduce magnesium oxide under high ...

Materials and energy cost assessment revealed that the proposed process is ~$0.75 more expensive per kg of magnesium than the dolomite-based process, assuming equal thermal reduction yields.

Marcin Szczepanski. Although dolomite is relatively plentiful in rocks older than 100 million years, scientists have been unable to replicate the geologic process in …

Combining the carbonate crystallization mechanism with thermodynamic and kinetic factors suggests that the early stage of dolomite precipitation or the …

The main data defin-ing the kiln capacity are: the raw material (dolomite) consumption is 6.7 tones per hour and the sinter dolomite production is 3 tones per hour. The kiln operates in average about 7300 h per year. Heavy oil consumption is about 375-400 L per hours or 125-133 L per ton of sin-tered dolomite.

The calcination of dolomite stone, which is one of the main stages of the sintered. dolomite manufacturing, is chemical process which proceeds in a vertical shaft or rotary kiln. When heated, the ...

The best-performing SSPCM contained 30 wt% 800Do, offering a thermal conductivity of 1.27 W/ (m·K) and thermal energy storage density of 359 kJ/kg in the …

Thermochemical equilibrium calculations indicate the possibility of considerable fuel savings and CO 2 emission avoidance in the three steps of the Pidgeon process: (a) calcination of dolomite; (b) production of ferrosilicon from quartz sand, coal, and iron oxide; (c) silicothermic reduction of calcined dolomite by ferrosilicon to …

Magnesium Production from Calcined Dolomite via the Pidgeon Process. August 2019. DOI: 10.1201/9781351045476-3. In book: Magnesium and Its Alloys (pp.47-56) Authors: Mehmet Bugdayci. Yalova ...

Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan, China; The phosphate ore flotation is achieved through the surface electrical behavior difference among apatite, dolomite and quartz, but it is usually affected by the dissolved ions from pulp, especially Ca 2+ and Mg 2+.The zeta potentials of …

The phosphate ore flotation is achieved through the surface electrical behavior difference among apatite, dolomite and quartz, but it is usually affected by the dissolved ions from pulp ...

Download scientific diagram | Electricity requirement of the process from publication: Fertilizer Grade Magnesium Sulphate Production from Dolomite | The escalating demand for the chemical ...

Dolomite is an important industrial raw material for the production of metal magnesium.However, the calcination of dolomite is a typical pollution-intensive industry and is one of the major contributors to CO 2 emissions in China. The requirements of energy conservation and environmental protection are driving the development of new …

The dolomite-containing samples are subjected to temperatures that enable the endothermic calcination [Scheme 1 (iii)] and then …

Materials and energy cost assessment revealed that the proposed process is ~$0.75 more expensive per kg of magnesium than the dolomite-based process, assuming equal thermal reduction yields.

Abstract. Thermochemical equilibrium calculations indicate the possibility of considerable fuel savings and CO{sub 2} emission avoidance in the three steps of the Pidgeon process: (a) calcination of dolomite; (b) production of ferrosilicon from quartz sand, coal, and iron oxide; (c) silicothermic reduction of calcined dolomite by ferrosilicon …

What are the natural processes that lead to the characteristic Mg–Ca order in the dolomite structure? These important geological questions have captivated the …

The energy balance of a rotary kiln used for calcination of dolomite in a magnesium production company identified the kiln shell (26.35% of the input energy) and exhaust gases (18.95%) as the ...

Dolomites are carbonate rocks mainly composed of the mineral dolomite. The mineral is stable in seawater in nature and not known examples of its direct extraction from seawater in large quantities required for origin of dolomite rocks. Dolomite occurs by suppression of aragonite or calcite, i.e. dolomitization process.

In the field of mineral processing, the successful flotation of target minerals requires sufficient liberation through grinding. The aim of this paper is to compare and evaluate the performance of ball versus short cylindrical media for comminution of dolomite by point and line contact, respectively. The results of the grinding experiments indicate …

Similar bulk energy changes (ΔE) during dolomitization process were calculated based on the DFT simulation in two substitution methods shown in Section 3.2, i.e. ΔE increased by 13.818 and 13.810 eV when Ca atom was replaced by Mg atom in BE and OE models (Fig. 5 a and b), respectively, further indicating that the formation of …

Dolomite is a mineral and a rock-forming mineral that is composed of calcium magnesium carbonate (CaMg(CO3)2). It is named after the French mineralogist Déodat Gratet de Dolomieu, who first described its properties in the late 18th century. Dolomite is often found in sedimentary rock formations and can occur in a variety of …

In this paper, the effects of hydration activity of calcined dolomite (HCD) on silicothermic reduction process were studied. A series of experiments were carried out on a single briquette to investigate the impact of different HCD on the chemical reaction kinetics of the silicothermic reduction process. This study was the first to experimentally show …

Dolomite as an economical calcareous material can be used as a soil amendment to remediate acidic soil ( Shaaban et al., 2017 ). Dolomite can react with H + in the soil to release CO 2, and, thereby, improve acidic soil and increase the pH ( …