Dolomite calcitic

The main alteration minerals surrounding Kuroko ore body are K-mica, K-feldspar, kaolinite, albite, chlorite, quartz, gypsum, anhydrite, and carbonates (dolomite, calcite, magnesite-siderite solid solution), hematite, pyrite and magnetite. Epidote is rarely found in the altered basalt (Shikazono et al., 1995). It contains higher amounts of ferrous iron (Fe203 content) than that from midoceanic ridges (Shikazono, 1984). 

If the above argument is correct and the /CO2 of hydrothermal solutions from back-arc basins is in equilibrium with alteration mineral assemblage including dolomite and calcite, t[ g2+ lmQ + of fluids can be estimated to be 0.03-0.055 from dolomite-calcite-... 

The C11SO4 activation method produces good zinc oxide metallurgical results when the ore contains dolomitic/calcitic gangue minerals. If the ore contains Fe-hydroxides, this method, however, produces poor results. 

Carbonates — Siderite-ankerite concentrations, dolomite, calcite, ankerite Ankerite, calcite, dolomite —... 

O Neil J.R. and Epstein S. (1966) Oxygen isotope fractionation in the system dolomite-calcite-carbon dioxide. Science 152, 198-201. 

Fig. 50 Calcite solubility and incongruent solution calcite-dolomite (calcite -precipitation and dolomite dissolution)...

Mass-age distribution and recycling rates Dolomite/calcite ratios Ooids and ironstones Calcareous shelly fossils The carbonate cycle in the ocean... 

Holland and Zimmermann, 2000). The latter authors do accept, however, that there is generally lower dolomite abundance in carbonate sediments deposited during the past 200 Myr. These qualihcations notwithstanding, a number of previously described parameters (Sr/Ca, Mg/ Ca, aragonite/calcite, possibly dolomite/calcite, and frequency of ooids and iron ores) appear to be related in some degree to sea-level stands, the latter at least in part a reflection of plate tectonic activity during the Phanerozoic. 

The Ca content of soils varies widely, ordinarily ranging from about 0.07 to 3.60%. Calcium is contained in a number of soil minerals including dolomite, calcite, Ca feldspars, apatite, amphiboles and many others. Coarse-tex-tured soils in humid regions, particularly those formed from rocks low in Ca minerals, are generally low in Ca. In spite of this, Ca deficiencies in crops do not appear to be of widespread occurrence, although a number of other factors affect nutrition in low base status soils. Fertilizers are not generally manufactured specifically to provide Ca as a plant nutrient, since this element is economically supplied by periodic applications of agricultural lime, as discussed subsequently. 

Smith and Robb (2) describe the formation of dolomite, calcite, and aragonite in Lake Uinta. Calcite was formed in the lake s lower layer from the calcium released by chemical digestion of silicates and aluminosilicates. Calcium released to a calcite-saturated sodium carbonate solution immediately formed calcite. 

Richness (L/t) Analcime Claya Quartz Feldspar Kspar Albite Ankerite/ Dolomite Calcite Pyrite TDIb... 

Shen and Chen (1996) put the alkaline consumption in this order gypsum > montmorillonite > kaolinite > illite > anorthosite (plagioclasite) > microclinite > quartz > mica > dolomite > calcite. These orders are consistent with the general trend. 

This value was not used because it apparently is a dolomite-calcite mixture. 

Calcite, dolomite, Calcite, feldspar. Quartz, dolomite. 

Further recovery of magnesite from HMS floats can be achieved by the use of froth floatation. Since floatation beneficiation requires fine particles, the HMS floats are milled to a 100-mesh powder and first fed into the insolubles cell, where a major reduction of silicates occurs. The concentrates from the insolubles cells are then fed into the rougher cells where large reduction in dolomite, calcite, and chlorite occurs. From the rougher cells, the concentrates enter into the cleaner cells where dolomite is again reduced along with plagioclase. The recleaner cells remove dolomite from... 

THE DEACTIVATION OF TAR CRACKING STONES < DOLOMITES, CALCITES, MAGNESITES) AND OF COMMERCIAL METHANE STEAM REFORMING CATALYSTS IN THE UPGRADING OF THE EXIT GAS FROM STEAM FLUIDIZED BED GASIFIERS OF BIOMASS AND ORGANIC WASTES ... 

The steam gasification of celiulosic wastes and biomass in fluidized beds is improved by placing a catalytic bed after the gasifier.The goal is to eliminate the tar in the exit gas and to diminish or to increase the 4-8 vol % of CH4 in the gasifier exit gas For such purposes three very different kinds of catalysts are being used 1st) calcined stones like dolomites, calcites and... 

Tannins are mainly used as depressants for dolomite, calcite and silicate minerals in the flotation of scheelite, apatite, fluorite and copper sulfide. Like starch, tannins after modification by oxidation, sulfidization and aminization (tannin O, S and A, respectively) have been used as a depressant for hematite in the reverse flotation of quartz with oleic acid or dodecylamine as collectors [22]. Flotation results show quartz to be depressed by tannins in the order of tannin A > S at low concentrations of dodecylamine. When an anionic collector is used for the reverse flotation of Ca +-activated quartz with tannins as depressant for hematite, the order of depression is tannin A > O > S. 

X-ray diffraction analysis of the products of the benefici-ation of Dow-Colony shale is shown in Table I. It is clear that the oleophilic extract (pellets) retains or concentrates the calcium and magnesium carbonates (dolomite, calcite, aragonite), particularly the dolomite. The hydrophilic gangue consists mainly of feldspar and quartz. Since silica, silicates and Ca/Ca-Mg carbonates, in a clean condition, are water wettable... 

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