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Let's take a look at what are the properties and characteristics of copper sulfide

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Author : TRUNNANO
Update time : 2021-01-19 10:15:11
What is Copper Sulfide?
Copper sulfide is an inorganic compound with a chemical formula of CuS, so in fact, two-thirds of the sulfur is supersulfide ions, and two-thirds of the copper is cuprous ions. It is dark brown, extremely insoluble, and the most difficult One of the soluble substances (second only to silver sulfide, mercury sulfide, palladium sulfide and platinum sulfide, etc.), because its poor solubility allows some seemingly impossible reactions to occur.

What is copper sulfide used for?
Copper sulfide finds applications in the following: Solar cells. Superionic conductors. Photodetectors.
Copper sulfide finds applications in the following:
Solar cells
Superionic conductors
Photodetectors
Electroconductive electrodes
Photothermal conversion devices
Microwave shielding coating
Active absorbents of radio waves
Gas sensors
Polarizers of infrared radiation
Is copper sulfide toxic?
Copper sulfide (CuS) has emerged as a promising photothermal agent. However, its potentially toxic effects still remained poorly understood. CuS nanoplates caused apparent toxicity to HUVEC and RAW 264.7 cells. For acute toxicity, the maximum tolerated dose and lethal dose 50 were 8.66 and 54.5 mg/kg, respectively.

How do you dissolve copper sulfide?
Although hydrochloric acid does not dissolve copper sulfides, an acid ferric chloride solution appears superior to ferric sulfate for oxidation and dissolution of chalcocite. Such a solution can be conveniently made by the addition of sodium chloride to a sulfuric acid-ferric sulfate solution.

Is copper sulfide flammable?
Keep away from heat, sparks and open flame. Other Handling and Storage Conditions: Store in a cool dry place away from sources of moisture and powerful oxidizers.

Why Sulphur is called the enemy of copper?
Sulfur is known to destroy the metallic properties of copper. Sulfur attacks copper to form the black spot of Copper Sulphide and hence is known as the 'enemy of copper'. Sulfur is derived from the Sanskrit word "shulbari" meaning enemy (ari) of copper (shulba).

Is the heating of copper and Sulphur a chemical change?
A chemical process occurs when the starting materials form new substances with different properties. Chemical processes coupled with energy conversions are called a chemical reaction. The copper and sulfur combine into a new substance, which can be recognized from the change in color, density and other properties.

 
What happens when you mix copper and sulfur?
Preparation and reactions: the reaction of copper powder in molten sulfur rapidly produces Cu2S, whereas pellets of copper require a much higher temperature.
Cu2S reacts with oxygen to form SO2: 2 Cu2S + 3 O2 → 2 Cu2O + 2 SO.
 
The Story of the Howe Sound's Underground Mine, Dry Stacking and Some Lessons for Northern Minnesotans

At the peak of production, the population of Holden Village, the Howe Sound company town that was located in the Cascade Mountain wilderness numbered about 600 (mostly miners and their young families). With the closure of the mine in 1957, all the employees and their families were displaced and had to move elsewhere. The miner's homes were burned down, but the community buildings and the chalets of the company executives and management were preserved.
 
The company eventually dug 60 miles of deep tunnels in order to extract the sulfide ore
 
During its 18-years of production, 10 million tons of sulfide ore were excavated. The ore was ground up into a fine powdery consistency and then processed into relatively pure copper and other metals. Those refined metals were then shipped down-lake and eventually to world markets, wherever the best prices could be obtained. During the war, most of the metals were purchased for use in Allied armaments industries.
 
A total of 212 million pounds of copper, 40 million pounds of zinc, 2 million ounces of silver, and 600,000 ounces of gold were produced from the 10 million tons of ore. 99% of the 10 million tons of powdery waste material still remain in Holden's massive dumpsite in what is now euphemistically called by the mining industry "dry stacking".
 
Underground mine tunnels inevitably break through groundwater deposits and underground streams, so the mine has to be continuously pumped dry to allow the mine to operate. However, when Howe Sound abandoned the mine, the pumps were shut off and the tunnels gradually filled up with highly acidic water that we "villagers" were warned to stay away from.
 
(Note: Sulfuric acid inevitably forms when pulverized sulfide-containing ore is exposed to water and oxygen). For decades, this toxic mine water has been over-flowing the mine portal into a river that flows into Lake Chelan and eventually into the Columbia River.
 
In the 1930s, dry stacking was the norm for mining companies as their method of disposal of the permanently toxic tailings - which happens to be exactly what Antofagasta/Twin Metals recently announced that it was planning to use at its controversial, not-yet-approved mine site, which is immediately adjacent to the pristine Boundary Waters Canoe Area Wilderness (BWCA), which is contiguous with Canada's equally pristine Quetico Provincial Park.
 
Mining Superfund Sites are not Good for any State, Especially Northern Minnesota
 
The dry tailings dump and the abandoned underground mine at Holden Village were designated a toxic Superfund site in the late 1980s by the US Environmental Protection Agency (EPA). But remediation was not begun until decades later.
 
But for the entire 70 years of its existence, the "dry stacking" tailings dumpsite has been polluting the area's ground and surface water (and the air as well). The polluting process of disposing of the mine waste started the very first day that the finely ground-up tailings began being dumped in mounds below the processing plant and adjacent to the river that flowed - along with its mine tailings contaminants - into the once pristine and once-fish-fertile Lake Chelan.
 
Lake Chelan has had its sportfishing industry adversely affected over the 70 years since Howe Sound dug the mine. The level of air pollution in the area varies with wind conditions and the amount of water pollution varies with rainfall and the spring snowmelt. (Note that the area receives an average of 300 inches of snow annually.)
 
Does "Dry Stacking" of Copper Sulfide Mine Waste Decrease Pollution or Increase it?
 
"Dry stacking" of toxic powdery uncovered tailings that blow around with the wind will create air pollution that wet tailings lagoons won't (unless the surface material dries up), but they likely will make downstream water pollution more likely in the short term - compared to the "wet" tailings lagoons that use soluble, earthen-walled dams that, under ideal conditions, hold back the equally toxic, water-logged, "slurried" tailings.
 
It all depends on the rainfall - unless and until the earthen dam of the lagoon dissolves or collapses, of course.
 
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