1. Introduction. Natural dolomite is the mineral form of the double carbonate of calcium and magnesium, CaMg(CO 3) 2.It occurs as the major constituent of sedimentary formations in association with calcite, CaCO 3.Dolomite was first described in 1791 as a rock by the French engineer and mineralogist Deodat Gratet de Dolomieu (1750–1801) …

M.M. Rashad and H.M. Baioumy / The European Journal of Mine ral Processing and Environmental Protection Vol.5, No.2, 1303-0868, 2005, p p. 174-183 Figure 2.Effect of temperature on MgO recovery,%

Secondly, thermodynamic and kinetic studies related to dolomite origin in recent decades are reviewed. Finally, based on the thermodynamic and kinetic considerations of dolomite formation, we discuss the possible formation process of dolomite and propose directions for the study of the genesis of dolomite. 2.

increasing dolomite content is accompanied by a higher amount of hydration products, as a result of crystallization on the fine dolomite grains and better water absorption, [36]. Figure 5 shows SEM pictures that illustrate how the temperature of the calcinations process affects the morphology of the calcined powders. Images reveal

It is observed that dolomite with different size fractions has depressing effect on hematite flotation using sodium oleate as collector, and dolomite could be the "mineral depressant" of hematite using sodium oleate as collector. ... International Journal of Mineral Processing, 2004, 74(1/2/3/4): 343–357. Article Google Scholar

International Journal of Mineral Processing 123 (2013) 25–31 ⁎ Corresponding author. Tel.: +86 10 13511052617; fax: +86 10 64449548. ... Synthesis of aragonite by carbonization from dolomite ...

International Journal of Mineral Processing. Volume 78, Issue 2, January 2006, Pages 63-77. Parameter studies on the rheology of limestone slurries. ... (Fig. 5), as is in agreement with previous conclusions for dolomite (Velamakanni and Fuerstenau, 1993) and for quartz slurries ...

International Journal of Mineral Processing. Volume 159, 10 February 2017, ... Smectite, illite, dolomite and K-feldspar crystals were found present in the sample. The quantitative mineralogical determination via Rietveld Refinement indicated that the distribution of these minerals is 45.70%, 31.50%, 19.30% and 3.50%, respectively.

The southern Florida phosphate deposits that will be mined in the future contain significant amounts of dolomite. Because high MgO levels are undesirable in phosphoric acid production, several flotation schemes for the removal of the dolomite have been attempted. Alternatively, selective flocculation has been suggested as a potential …

The crystal structure of dolomite is similar to calcite with Mg ions substituting for Ca in every other layer. To accommodate this substitution, due to differences in bond lengths between Ca–CO 3 and Mg–CO 3 (238 pm versus 208 pm, respectively), CO 3 in the Mg layer is uniformly rotated about the threefold axis relative to calcite (Reeder and …

International Journal of Mineral Processing, 2001, 62(1/2/3/4): 27–39. Article Google Scholar ZHENG X, ARPS P J, SMITH R W. Adhesion of two bacteria onto dolomite and apatite: their effect on dolomite depression in anionic flotation [J]. International Journal of Mineral Processing, 2001, 62(1/2/3/4): 159–172.

Secondly, thermodynamic and kinetic studies related to dolomite origin in recent decades are reviewed. Finally, based on the thermodynamic and kinetic considerations of dolomite formation, we discuss the possible formation process of dolomite and propose directions for the study of the genesis of dolomite. 2.

In an ideal structure of dolomite, alternating layers of Mg 2+, Ca 2+ are interspersed with CO 3 2− groups oriented normal to the c-axis (Fig. 1), with a Mg/Ca molar ratio of 1 (stoichiometry) and an ordered arrangement.The larger radius Ca 2+ occupy A sites and the smaller radius Mg 2+ occupy B sites. The standard unit cell parameters of …

As shown in Fig. 3, as the NaOL dosage increases, the recoveries of both apatite and dolomite are enhanced.At higher dosages (≥ 25 mg/L), recoveries of both minerals are close to the maximum values.Therefore, 25 mg/L is considered the optimal NaOL dosage for apatite and dolomite flotation.The recovery of dolomite is higher than …

Process 2: Grinding and classifying dolomite rock. The grinding process is to obtain the dolomite powder needed in the market, mainly including 200 mesh, 325 mesh, 425 mesh, and 800 mesh. 1 grinding: The crushed dolomite is transported from the bottom up to the silo by a bucket elevator and then sent to a grinding machine for grinding by an ...

Thermal behavior of natural dolomite. Journal of Thermal Analysis and Calorimetry 119, 2239–2248. ... The flotation process is most widely applied to balance the P2O5 recovery ratio and cost. In ...

Abstract. It was previously reported that dolomite samples from different locations showed varying flocculation behavior with poly (ethylene oxide) (PEO). In this study, a Florida dolomite sample was examined, and it was determined that palygorskite associated with dolomite was responsible for its flocculation with PEO.

Abstract. Dolomite is a mineral material that is formed from limestone which is mostly contains the calcite (CaCO 3) and magnesite (MgCO 3 ). This paper aimed to study on thermal decomposition of dolomite under air atmosphere. Calcination of dolomite was carried out by using furnace with heating rate of 10 °C/minute in an air atmosphere.

The topic of dolomite formation has long presented a challenge to researchers. In this study, the origin of widely occurring oolitic dolomites from the Yudongzi outcrop in the lower Triassic Feixianguan formation in northwest Sichuan, China, was investigated through petrographic observations, and mineralogical and geochemical …

Dolomite as a heterogeneous catalyst can be used in biodiesel synthesis. Process material costs can be reduced by regenerating and reusing the catalyst. Two methods of regeneration of dolomite were studied: (1) washing for 30 min with methanol, filtration, and washing for 30 min with hexane and (2) calcination at high temperature. …

Dolomite has become a kind of important ores for magnesium production with the widespread use of Pidgeon process. However, high energy consumption, high pollution and easy deliquescence for calcined dolomite are the three serious obstacles for industrial production of magnesium by Pidgeon process.

The European Journal of Mineral Processing and Environmental Protection Vol.5, No.2, 1303-0868, 2005, pp. 174-183 Chemical processing of dolomite associated with the phosphorites for production of magnesium sulfate heptahydrate M.M. Rashad*, H.M. Baioumy Central Metallurgical Research and Development Institute, P.O. Box: 87 …

Spent Pot Lining First Cut (shortened to SPL-1cut) is a solid waste discharged from a primary aluminum electrolytic production process. SPL-1cut is classified as hazardous waste in China because it contains large amounts of soluble sodium fluoride and a tiny amount of cyanide. Most of SPL-1cut is carbon—about 65%—and its calorific …

International Journal of Mineral Processing. Volume 167, 10 October 2017, Pages 35-41. Influence of cations Ca 2 +, Mg 2 + and Zn 2 + on the flotation and surface charge of smithsonite and dolomite with sodium oleate and sodium silicate. Author links open overlay panel Ana Carolina Arantes Araújo, Rosa Malena Fernandes Lima. Show …

Most dolomite forms as a calcium-rich and/or poorly ordered metastable phase when seawater is actively circulated through carbonate sediments. Modification of seawater by evaporation, mixing with meteoric water, and/or sulfate reduction promotes dolomitization, but is not necessary. The extensive circulation which is necessary for …

The results showed thatthe dolomite content in the concentrate obtained by closed-circuit flotation with one-stage roughing and four-stage cleaning process was 83.62%, the recovery rate was 80.49%, the SiO 2 content was 0.86%, the removal rate of SiO 2 rate was 84.10%, and the whiteness was 45.7%. Modified dolomite may be a raw material for ...

Dolomite, CaMg(CO 3) 2, is an abundant carbonate mineral in ancient rock formations, but it is extremely scarce in modern sedimentary environments.This intriguing observation has been repeatedly referred to as the "dolomite problem" in the geological literature. Many geoscientists over time have almost obsessively searched for a solution …

International Journal of Mineral Processing. Volume 74, Issues 1–4, 19 November 2004, Pages 343-357. ... The magnesite and dolomite samples used in this study were acquired from Haicheng Magesite Mine and Dashiqiao Dolomite Mine, Liaoning Province, China, respectively. Once received, the samples were immediately crushed to …

Stock temperature-time curves of LDPE/KCF biocomposites with different contents of dolomite are indicated in Figure 3.Stock temperature is defined as the temperature inside the Brabender mixing chamber which is usually the same as the processing temperature if there is no extensive shearing occurs [].Based on the results, most of the samples …

ABSTRACT. Magnesium oxide suitable for the use in basic refractories was prepared from dolomite (CaMg (CO 3) 2) by hydrochloric acid leaching, precipitation with CO 2 and thermal hydrolysis. Leaching of the dolomite ore in aqueous hydrochloric acid solution was investigated with respect to the effects of time on dissolution of the dolomite sample.