24-05-2014, 10:24 AM
PROCESSING OF MERCURY – STIBIUM GOLD BEARING ORE OF DJIJIKRUT DEPOSIT
PROCESSING OF MERCURY.pdf (Size: 1.22 MB / Downloads: 28)
ABSTRACT
The Republic of Tajikistan has large mercury-antimony deposit. The Republic takes the second place
in the countries of the CIS by having antimony recourses or the fourth place in the world. Recently, on
the mine bottom horizons the resources of gold were found. Gold in the data ore is submitted as
nanosize particles. Results of ores enrichment of bottom horizons of Djijikrut deposit are obtained by a
method of flotation. The flow sheet includes the rougher flotation, two scavenging flotation and two
cleaner flotation. As a result of enrichment of ore, the mercury-antimony concentrate with the contents
of 51.5% of antimony and recovery 90.3% from ore with the content of mercury of 3.5% was received.
The investigation of thallium, selenium, and tellurium distributions on products of enrichment was
carried out.
The most effective reagents are a mixture of oksafore and butyl xanthogenate. While applying this
mixture of reagents it is possible to refuse of the use of activator - nitrate lead.
The behavior of gold is in details investigated during enrichment. To collective flotation concentrate is
extracted only 30% of gold. The basic quantity of gold concentrates in tailings of flotation and is not
taken by existing traditional methods. The alternative innovative technology of gold extraction was
created.
Various methods of roasting of a collective mercury - antimony concentrate oxidizing and reducing are
investigated.
Vacuum distillation of concentrate allocation in serial sublimates mercury and antimony was designed.
°
In the received calcine concentrates gold. At additional roasting of a calcine up to 900 С concentration
of gold makes 30.6 g/t. The offered innovational technology in a complex allows to process ores and
concentrates unique mercury-antimony–gold bearing raw material.
INTRODUCTION
Tajikistan is rich in mercury-antimony deposits (Scalnoe, Djijikrut, etc.). The Republic takes the second place in
the CIS countries by having antimony resources and the fourth place in the world. Antimony-mercury ores of
Djijikrut deposits are processed at Anzob GOK (Tajikistan) by flotation to produce a mercury-antimony
concentrate. However, for the lower horizons of the field, we can observe a sharp increase in the content of
antimony, mercury, and gold which content is already more than 2 g/t in the ore. There are about 6.9 million
tons of gold ore and 14 tons of gold in it. Gold in these ores is presented in the form of nanoscale particles. Size
of individual gold particles is about 2.8 micron.
All these predetermine the research on complex processing of the ores. The technology of complex processing of
antimony-gold and gold-antimony ore must be based on the combined scheme in which the elements of the
"golden" and "antimony" technology are closely intertwined and complement each other, providing maximum
extraction of both valuable components (Lodeyshikov and Panchenko, 1981).
In the balance of the distribution of securities and associated components of the ore deposits Djijikrut it was found
that, the same minerals are both hubs and carriers of certain elements. Thus, the hub and carrier of antimony is
antimonite, mercury - cinnabar, hubs, and partly carriers of gold, silver, thallium, and selenium - marcasite and
pyrite. The main carrier of gold is Non-Metal raw materials of breccias.
Carbonaceous substance is widely spread in the deposit both in ore-bearing rocks and in the ores. There are two
major associations, bearing gold: early carbonaceous - carbonate with sulfides (first sedimentary - digenetic type
ores) and late gold - cinnabar - calcite (third type of supergene ore). Inclusions of early paragenesis gold are
installed, mostly in clastic rocks.
MATERIALS AND METHODS
Ore sample was investigated in which the metal content was: Sb-3.8%; Hg-0.4%; Au-2.5 g/t; Tl-29 g/t; Se-12g/t;
Te-14g/t. Flotation was carried out in a mechanical flotation cell with 250 g hinges. Nonionic low-toxicity
surfactants were used as flotation reagents. (Grade 4 toxicity and hazards), such as "Oksafor-1107" (O-1107),
"Pemisol" and butyl xanthate, lead nitrate, frother - T-80, Formula O -1107 is presented below. "Pemisol." has the
following composition: kumilfenol – 1.5-15%, the fraction of aromatic hydrocarbons with a boiling point of 135 –
°
154 C beginning and the end of the boiling 164 – 270°C –- 70%, non-ionic SAS - OP-10 – 15-28.5%.
CONCLUSIONS
The technology of mercury-antimony gold bearing ore processing of Djijikrut deposit is offered. The technology
of vacuum distillation of antimony - mercury gold bearing concentrates of Djijikrut deposit and pyroselection of
calcine after a preliminary distillation of mercury, which allowed us to obtain marketable products of mercury
and antimony, is developed.