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首页> 外文期刊>THE CANADIAN MINERALOGIST >GEOCHEMICAL AND MINERALOGICAL ZONING OF HIGH-SULFIDE MINE-WASTE AT THE BERIKUL MINE-SITE, KEMEROVO REGION, RUSSIA
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GEOCHEMICAL AND MINERALOGICAL ZONING OF HIGH-SULFIDE MINE-WASTE AT THE BERIKUL MINE-SITE, KEMEROVO REGION, RUSSIA

机译：俄罗斯克麦罗沃地区贝里库尔矿山高硫矿山废物的地球化学和矿物学分区

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Geochemical zoning of the high-sulfide (40-45 wt. percent sulfides) and low-carbonate (3 wt. percent dolomite) waste at the Berikul gold mine. Kemerovo region, Russia, was studied in order to understand the processes controlling As, Cd, Cu, Pb and Zn migration from the waste. The following zones were distinguished from bottom to top: (1) slightly altered waste. (2) cemented hardpan zone. (3) melanterite zone, (4) intermediate zone and (5) jarosite zone. A sequential scheme of extraction was used to separate (a) water-soluble, (b) exchangeable, (c) carbonate, (d) phases bound with Fe~(3+), and (e) residual fractions of Fe, As, Zn, Cu and Cd. The two basal zones reflect an early stage of weathering, where acid generated by sulfide oxidation is neutralized by carbonate. Neutralization processes promote coprecipitation of As, Cd, Cu, Pb and Zn in Fe~(3+) phases, such as amorphous Fe sulfo-arsenate and jarosite. An intermediate stage, recorded in the melanterite and intermediate zones, is identified by the disappearance of the carbonates and a decrease in the pH of pore solutions. At low pH, sulfides are oxidized by Fe~(3+), producing Fe~(2+), SO_4~(2-), and liberating As, Zn, Cu and Cd, which accumulate in the pore water. This step results in the precipitation of Zn-, Cu- and Cd-bearing melanterite. The intermediate stage of weathering continues until most of the sulfide fraction has been oxidized. Then, as shown in the upper jarosite zone, the concentration of Fe~(3+) again increases in the pore waters because it is not being utilized in sulfide oxidation, and Fe~(3+) phases, such as jarosite, precipitate. By this stage, significant amounts of As, Zn, Cu and Cd have been leached from the weathered residue, but Pb precipitates in the jarosite.
机译：Berikul金矿的高硫化物（40-45 wt％硫化物）和低碳酸盐（3 wt。％白云石）废物的地球化学分区。为了了解控制废物中As，Cd，Cu，Pb和Zn迁移的过程，对俄罗斯Kemerovo地区进行了研究。从底部到顶部区分以下区域：（1）废物略有改变。 （2）硬结带。 （3）黑铁矿带，（4）中间带和（5）黄钾铁矾带。提取的顺序方案用于分离（a）水溶性，（b）可交换，（c）碳酸盐，（d）与Fe〜（3+）结合的相以及（e）Fe，As，锌，铜和镉这两个基础区域反映了风化的早期阶段，其中硫化物氧化产生的酸被碳酸盐中和。中和过程促进了Fe〜（3+）相中As，Cd，Cu，Pb和Zn的共沉淀，如无定形的亚硫酸铁砷酸盐和黄铁矿。记录在黑铁矿和中间区域的一个中间阶段是由碳酸盐的消失和孔隙溶液的pH值降低确定的。在低pH值下，硫化物被Fe〜（3+）氧化，生成Fe〜（2 +），SO_4〜（2-），并释放出As，Zn，Cu和Cd，它们累积在孔隙水中。该步骤导致了含锌，铜和镉的黑铁矿的沉淀。风化的中间阶段一直持续到大部分硫化物级分被氧化为止。然后，如上部的黄钾铁矾区所示，由于未用于硫化物氧化，因此孔隙水中的Fe〜（3+）浓度再次增加，并且黄铁矿等Fe〜（3+）相沉淀。在这一阶段，风化残留物中已浸出了大量的As，Zn，Cu和Cd，但Pb沉淀在黄铁矿中。

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