Tailings Is a Kind of Precious Secondary Resources
已有 349 次阅读 2012-04-27 16:21China is a mineral rich in natural resources, the full range of countries.
Tailings solid waste emissions in the concentrator in the specific economic and
technical conditions, the finely ground ore select useful components, mineral
development and in particular metal mine development an important source of
environmental pollution caused. At the same time, constrained by the level of
mineral processing technology, production equipment, mineral development and the
common way to cause loss of resources, so tailings with the double character of
the secondary resources and environmental pollution. Tailings recycling machines
is specialized recycling the tailings equipment.
Most contain a variety of
colored, black, precious, rare earth and non-metallic minerals in the tailings,
is a valuable secondary mineral resources, pending further development of
recycling. For example, from copper tailings may elect a variety of useful
components of copper, gold, silver, iron, sulfur, fluorite, wollastonite,
barytes, etc.; recovery of lead, zinc, antimony, tin tailings, silver and other
metals. Only to the recovery of fine iron ore from the iron ore tailings, iron
ore tailings grade average of 11%, up to 27% iron concentrate grade of 61%
recycling, the yield of 2% to 3% a year (300 ~ 400) × 104 t iron ore concentrate
from the iron ore tailings can yield equivalent to the investment of billions of
dollars to build a large-scale joint ventures. Tailings can bring economic
benefits, but also can cause a greater negative impact on the environment,
mainly reflected in the mine tailings will be a direct result of environmental
pollution: ore directly carry excessive pollutants, such as the radioactive
elements and other harmful components ; chemicals used in the beneficiation
process, remaining in the tailings and some components of which react to produce
new sources of pollution; tailings oxidation, hydrolysis and weathering changes
in the surface stacking conditions, so that the original non-polluting
components into the components of pollution, such as some heavy non-ferrous
metal mining widespread sulfide; Fourth, surface water flows through the
tailings dumps sites, through interaction with the tailings, dissolved some of
the harmful components carry the transfer, resulting in large-scale pollution;
five particles due to metal mine tailings fine, tailings discharged from dry
dust carried by the wind easily cause pollution;, some mine tailings directly
excretion in lakes, rivers, polluted water bodies and blocks river, caused by
major disasters. Recycling tailings of tailings recycling machines, recycling
tailings management to strengthen the mine will bring more benefits.
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