What is Zinc Sulfide ZnS?

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Commodity prices are on track for their biggest rally in more than a century, while fixed-income assets have seen their longest run of outflows as the war in Ukraine adds to inflationary pressures in the global economy emerging from the coronavirus lockdown, according to Bank of America.

"Commodity prices this year are on track to record their biggest gains since 1915." the bank said in its weekly briefing. They cite many factors, such as pandemics, lockdown, civil strife, wars, excessive monetary and fiscal stimulus, and supply chain disruptions, that have led to "historically" high inflation.  

By the same token, it said government bonds were heading for their worst year since 1949, and "negative-yielding bonds will quietly disappear" from the market as central banks embark on a monetary tightening cycle and raise interest rates to tame soaring inflation.  

The prices of many commodities like the ZnS powder are expected to increase in the future.

Introduction to Zinc Sulfide ZnS Powder
Zinc sulfide is an inorganic compound with the chemical formula ZnS. It is a white or yellowish powder that darkens when exposed to sunlight. It is stable in dry air, and for a long time in humid air, it will gradually oxidize to zinc sulfate. It is usually produced by the action of hydrogen sulfide with zinc salt solution. Zinc sulfide has an excellent fluorescence effect and electroluminescence function. In particular, nano zinc sulfide has a unique photoelectric effect, and it presents many excellent properties in the fields of electricity, magnetism, optics, mechanics, and catalysis.
 
Physicochemical Properties of Zinc Sulfide ZnS Powder
The chemical bond between Zn and S of zinc sulfide tends to be covalent. The crystal has three different configurations: low-temperature type, that is, sphalerite structure, which is abundant in nature, colorless cubic crystal, the Zn, S coordination number is 4, and the relative density is 4.10. At 1020℃ it will transfer to high-temperature type; High-temperature type, that is, wurtzite structure, colorless hexagonal crystal, Zn, S coordination number are 4, the relative density is 3.98, melting point is about 1700℃. It is a zinc sulfide high-temperature stable structure; High-pressure type, namely sodium chloride structure, Zn, S coordination number are 6, the relative density is 5.21. There is also an aqueous compound ZnS·H2O, which is a white powder with a relative density of 3.98 and a melting point of 1049℃. Zinc sulfide is insoluble in water and dilute alkali, and insoluble in acetic acid, but soluble in low concentrations of strong acids such as hydrochloric acid, which release hydrogen sulfide. The solubility product of zinc sulfide is similar to the K1·K2 value of hydrosulphuric acid, so the following equilibrium exists in dilute acid: 
Zn2+H2S=2H+ZnS 
It can be seen that in the highly acidic zinc salt solution, hydrogen sulfide gas cannot get zinc sulfide precipitation. In zinc salt solution, hydrogen sulfide gas is introduced, zinc sulfide precipitation can be obtained, but the precipitation is not complete. Using ammonium sulfide solution as precipitant, zinc ions in zinc salt solution can be precipitated into zinc sulfide completely, because ammonium sulfide solution is alkaline, the acidity of the system can be reduced. In industry, the above method should be used to isolate air.  White zinc sulfide darkens when exposed to light and is easily oxidized to zinc sulfate in air. Zinc sulfide can be used as a white paint pigment by itself or in combination with zinc oxide. Pure zinc sulfide does not emit light. If trace manganese, copper, and silver are added to zinc sulfide crystals as activators, they can emit different colors of fluorescent light after light irradiation, which is called fluorescent powder and is used to make fluorescent screens and luminous paint. Zinc sulfide is also used in leather, enamel, rubber, dye, and other industries. 
Zinc sulfide is corrosive and poisonous. It can irritate the skin. Operators should wear overalls and protective equipment. The workshop should be well ventilated. 
 

Zinc Sulfide ZnS Powder CAS 1314-98-3
 

Preparation Methods of Zinc Sulfide ZnS Powder
Double decomposition method: Add zinc sulfate solution to the reactor, and slowly add ammonium sulfide for double decomposition reaction under stirring. Zinc sulfide and ammonium sulfate will be generated, then remove ammonium sulfate by filtration, and then by evaporation concentration, cooling crystallization, centrifugal separation, zinc sulfide will be produced
ZnSO4+(NH4)2S---ZnS+(NH4)2SO4 
 
Applications of Zinc Sulfide ZnS Powder
1. Can be used as analytical reagents, phosphor matrix, photoconductor material; Or used for dyes, coatings, pigments, glass, curing oil manufacturing, etc.
2. Zinc sulfide is widely used in the production of infrared windows, fairing, and infrared optical elements. It has characteristics of high purity, insoluble in water, moderate density, and easy processing. Zinc sulfide has good refractive index uniformity and consistency. It has good image transmission performance in the band range of 8-12μm, but some of it begins to absorb after 10um. In the middle infrared band, the transmittance is higher, and the absorption and scattering are enhanced along with the shorter wavelength. Zinc sulfide has strong resistance to the harsh environment, and the high hardness and fracture strength are twice that of Zinc Selenide.
Tough front optics for zinc sulfide thermal imaging systems for infrared windows and thermal bands (8 to 14μm).
Single-crystal zinc sulfide is available but not common. The scattering is very low in the usual spectral range. It can be used as a high-power laser device under the condition of strictly controlling the bulk absorption and internal structural defects of the material and adopting the polishing technology with small damage degree and the coating technology with the highest optical quality. 
Zinc sulfide oxidizes significantly at 300℃, exhibits plastic deformation at about 500℃, and dissociates at about 700℃. For safety reasons, zinc sulfide windows should not be used above 250°C in a normal atmosphere.
3. Used for optical coating target, X-ray screen, the luminescent dial by adding a trace amount of radium or neothorium salt, TV screen, and pigment for paint.
 
Main Supplier of Zinc Sulfide ZnS Powder
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and Nanomaterials, including ZnS powder, nitride powder, graphite powder, zinc sulfide, calcium nitride, 3D printing powder, etc.
If you are looking for high-quality zinc sulfide powder, please feel free to contact us and send an inquiry. ([email protected])
 

The World Food Program (WFP) of the United Nations (UN) and the European Union (EU) said in a statement that the conflict between Russia and Ukraine poses risks to global food supplies, and called on the international community to increase support for vulnerable countries and jointly address food security challenges. 

A few days ago, the Executive director of the World Food Program, the European Commission's commissioner in charge of crisis management, the French Foreign Minister of the ROTATING EU presidency, and other officials held a meeting in Rome, Italy, to discuss how to deal with the negative impact of the Conflict between Russia and Ukraine on global food security. 

One of the officials told a news conference after the meeting that the world was facing a food supply challenge that would "last for many years" as the conflict between Russia and Ukraine pushed up global food prices and disrupted the ZnS powder will continue.

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