According to a foreign media New Atlas report, after sewage and other wastewater is treated by a water treatment plant, a kind of gravel is usually left behind. These gravel usually end up in landfill, but soon they can be used as a more environmentally friendly repair material for ground potholes. Currently, potholes are filled with asphalt. Unfortunately, though, the material contains a toxic substance called polycyclic aromatic hydrocarbons. These substances are dangerous for construction workers and others who may be exposed to these hydrocarbons because they can seep out of the asphalt and enter the environment.
The remaining gravel used in sewage treatment is also problematic. It is not only non-biodegradable, but because it contains pathogens, it cannot be recycled as is. With this in mind, researchers at California State University Bakersfield set out to make this substance more useful.
They first mixed wet sand with calcium oxide and magnesium oxide to create a mortar that pathogens cannot proliferate. Next, they converted the slurry into mortar by adding a weak acid called potassium dihydrogen phosphate. The result is a chemically bonded phosphate ceramic (CBPC), which the team refers to as grit-assisted repair agent (GAP).
In laboratory tests, it was found that the compressive strength of this material is similar to that of asphalt, but the researchers believe that when it is finally used to fill potholes, it should last longer than asphalt. In addition, it is non-toxic to the human body.
Under the leadership of Dr. Zhongzhe Liu (transliteration), scientists are now assessing the degree of adhesion of GAP to existing pavements and are committed to further improving its compressive strength and durability. They plan to test it on normal traffic roads.
The research will be presented at an online meeting of the American Chemical Society this week.
Pyrite as Fillers Used in Steelmaking and Core-Spun Yarn
Steel-making/casting core-clad wire (filling material)
Place of Origin: Henan Luoyang, China
Pyrite, Iron pyrites, pyrites lump, Ferro sulphur, Pyrites powder.
Product Description:
Detailed introduction: is used as the filling material of cored wires and resulfurization additive agent for steel-making and casting. It is used for adding sulfur element in steel smelting to improve the cutting performance, inoculation effect, graphite shape and mechanical properties of gray pig iron.
Quality:
S: 48%min, FE: 42%min, SIO2: 3.0%max, PB: 0.1%max,
ZN: 0.1%max, AS: 0.1%max, . C: 0.3%max, CU: 0.2%max,
H20: 1.0%max, SIZE: 95%min
Granularity: (0-3)mm/(3-8)mm/(3-15)mm/(15-50)mm or other particle size.
Packing: 25KG/500KG/1000KG/BAG or 1000KG/BAG or other packaging.
Note: if there are special requirements, the product can be customized according to clients` requirements.
Iron Pyrite
Pyrite, Iron pyrites, pyrites lump, Ferro sulphur, Pyrites powder
LUANCHUAN COUNTY HENGKAI METALLURGICAL MATERIALS SALES CO.,LTD , https://www.pyritechina.com