Minerals anglesite

Lead sulfate occurs in nature as the mineral, anglesite. It is an essential component of lead-sulfuric acid storage batteries and forms during discharge... 

Elemental composition Pb 68.32%, S 10.57%, O 21.10%. the solid crystalline powder or the mineral anglesite may be characterized by x-ray techniques and physical properties. Lead can be analyzed in the sohd compound or its nitric acid extract by various instrumental techniques (See Lead). 

The maximum allowable concentration of Pb ions in drinking water is 0.05 ppm (that is, 0.05 g of Pb in one million grams of water). Is this guideline exceeded if an underground water supply is at equilibrium with the mineral anglesite, PbS04 K p = 1.6 X 10 ) ... 

Different acid, base, and salt solutions are sometimes used to selectively separate out metal-bearing minerals. For example, sulfuric acid is used to separate the copper and iron from the mineral chalcopyrite, CuFeS2, and a sodium chloride solution is used to separate the lead from the insoluble mineral anglesite, PbS04. 

Lead is obtained chiefly from galena (PbS) by a roasting process. Anglesite, cerussite, and minim are other common lead minerals. 

Of all the lead oxide minerals, cerussite and anglesite [1,2] have been studied the most. The flotation properties of cerussite and anglesite are different in such a way as the anglesite is less amenable to sulphidization than cerussite. The sulphidization process for both minerals is a delicate process and is sensitive to (a) level of additions of sulphidizer, (b) the number of sulphidization stages and (c) conditioning time with sulphidizer. 

Excess of sulphidizer has a negative effect on cerussite and anglesite recovery. Figure 20.1 shows the effect of the level of Na2S on cerussite and anglesite recovery. These results have demonstrated that too high an addition of sulphidizer results in mineral depression. 

Occurrence. It is by far the most abundant of the heavy elements. The most important ore is galena PbS. Other minerals are anglesite PbS04, cerrusite PbCO. ... 

ANGLESITE, Naturally occumng lead sulfate (PbSQi), which crystallizes in the orthorhombic system and may be found mixed with galena, from which it is usually formed by oxidation. Hardness, 3 specific gravity, 6,12-6.39 luster, adamantine to vitreous or resinous transparent to opaque streak, white colorless to white or green, but rarely may be yellow or blue, This mineral is used as a source of lead. 

Alteration results from the addition of new material or partial removal of original material from a mineral, e.g.. anglesite after galena or gypsum after unhydrite. 

Occurrence. The single most important ore of lead is the sulfide, galena (PbS). Minerals of considerably less commercial value include anglesite (PbS04), cerussite (PbC02), and wulfenite (PbMo04). 

The principal ore mineral of lead is galena [PbS], and the predominant sulfates derived from it are anglesite [PbS04] and plumbojarosite. Partial substitution of lead for the alkali-site cations also occurs in other members of the jarosite supergroup. An unusual sink for copper and aluminum is the mineral hydrowoodwardite [Cui A1 (0H)2(S04) ,/2(H20) ], recently discovered as a supergene product at several old mines in Saxony, Germany (Witzke, 1999). The same mineral was almost simultaneously reported to occur as bluish coatings on weathered waste rocks and in stream sediments at two former mines in northern Italy (Dinelli et al., 1998). 

Wastes from lead-rich mineral deposits typically form anglesite in sulfate-dominant environments, but in limestone-dominated host rocks and in gangue containing abundant carbonates, both cerussite [PbCOs] and hydrocerussite [Pb3(-003)2(01-1)2] have been reported as secondary minerals in mining-related wastes. Several carbonate and hydroxycarbonate minerals of copper and zinc were reported by Hudson-Edwards et al. (1996) as secondary products in stream sediments in the Tyne Basin, England. 

F. Rashchi, A. Dashti, M. Arabpour-Yazdi, and H. Abdizadeh, Anglesite flotation a study for lead recovery from zinc leach residue. Minerals Engineering 18(2) (2005). 

The most common lead ore is galena (lead sulfide, PbS 87% Pb), followed by anglesite (lead sulfate, PbS04 68% Pb), and cerussite (lead carbonate, PbCOj 77.5% Pb). The two latter minerals originate from the natural weathering of galena. Other elements fre-... 

The most important Pb ore is the heavy black mineral galena (PbS), while other ore minerals are anglesite (PbS04), cerussite (PbC03) and pyromorphite (Pb5(P04)3Cl). 

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