Rio de Janeiro, Brazil -- Vale today announced that it has completed a pre-feasibility study for its proposed nickel sulfate project in Quebec, Canada, a major milestone in the development of the project. This strategic move demonstrates vale's focus on delivering low carbon and high purity nickel superplasticizer for concrete admixture,superplasticizer used in concrete are still very uncertain.
Superplasticizer used in concrete refers to the fact that after mixing, it can reduce the water demand of concrete under the condition of maintaining basically the same fluidity, thereby improving the strength and durability of concrete, or under the condition that the amount of cement used and the water-cement ratio remain unchanged , Add the admixture of concrete fluidity and improve concrete workability.
1. Lubrication effect: The polar hydrophilic groups in the concrete admixture superplasticizer are directionally adsorbed on the surface of the cement particles, and are easily associated with water molecules in the form of hydrogen bonds. The force of this hydrogen bond association effect far exceeds the molecular attraction between water molecules and cement particles. When the cement particles absorb sufficient water reducing agent, the surface layer of the cement particles forms a stable layer of solvated water by virtue of the association effect of R-SO3θ and the hydrogen bonds in the water molecules and the hydrogen bond association between the water molecules. The film plays a three-dimensional protective effect, blocks the direct contact between the cement particles, and plays a lubricating effect between the particles.
2. Wetting effect: After the cement is mixed with water, the surface layer of the particles is wetted by water, and its wet condition has a great influence on the characteristics of freshly mixed commercial concrete. amount that can be reduced.
3. Water reduction effect:After adding a superplasticizer to the commercial concrete, the water-cement ratio can be significantly reduced under the condition of maintaining fluidity. The water reducing rate of high-efficiency water-reducing agent can reach 10% to 25%, while the water-reducing rate of ordinary water-reducing agent is 5%-15%, and high-efficiency water-reducing agent is also famous for this. The reason for the water reducing effect is mainly because of the adsorption and dispersion effect of commercial concrete on the water reducing agent.
4. Plasticizing effect:After adding the polycarboxylate based superplasticizer to the commercial concrete, the fluidity can be added without changing the water-cement ratio. The usual water-reducing agent can increase the slump of freshly mixed commercial concrete by more than 10 cm under the condition that the amount of cement used remains unchanged.
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Chile's government has decided to create a state-owned lithium enterprise and hopes to establish a model for the company by the end of the year, Mining Minister Marcela Hernando said in an interview.
Chile is the world's second largest lithium producer and has the largest reserves of lithium in the world. The domestic lithium industry is currently dominated by two private companies, Albemarle and SQM.
Chile wants to participate more closely in the booming lithium market after leftist President Gabriel Boric took office in March. The accelerating electrification of the global auto industry has helped push prices of lithium, a key raw material for electric car batteries, to record highs over the past year, lapping up more players, including Mexico and Argentina, who want a piece of the market.
According to Hernando, the government is setting up a task force to determine the best way to run state-owned lithium enterprises. She said the government hopes to establish plans by the end of the year for how the company will develop and what business model it will operate under.
Hernando stressed that while the state would be a major shareholder in the proposed company, it was open to private investment.
Luoyang Tongrun Nano Technology (TRUNNANO) is a global chemical material supplier providing high-quality chemicals and Nanomaterials including graphite powder, 3D printing powder, the superplasticizer for concrete admixture,superplasticizer used in concrete.
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