The purchasing pace at the demand end of the international thermal coal market continues to slow down and the international thermal coal price continues to decline. Prices for thermal coal at major international ports continued to fall last week as buyers in Europe slowed in recent days for April, coupled with weaker-than-expected import demand from End users in China. According to China Coal Market net monitoring: Australia Newcastle port thermal coal price index was 253 USD/ton, compared with 309.02 USD/ton, down 56.02 USD/ton, down 18.13%. South Africa's Port Richards thermal coal price Index was $264.5 / mt, down the US $62.72 / mt or 19.17% from US $327.22 / mt. The European ARA Tri-port thermal coal price Index was $281.8 / ton. Does the price of thermal coal in major international ports continue to decline to affect the price of the foam concrete?
What are the types of foam concrete foaming agents?
The foamed concrete foaming agent can make concrete appear a lot of foam to accelerate the formation and use of foamed concrete. Use efficiency and speed up the progress of the entire construction project. Foamed concrete foaming agents are available in the market. What are the types of foam concrete foaming agents?
What is foam concrete foaming agent?
The foamed concrete foaming agent is a substance that can make its aqueous solution generate a large amount of foam when the mechanical force is introduced into the air. This kind of substance is a surfactant or a surface-active substance. The former such as anionic surfactants, cationic surfactants, non-ionic surfactants, etc., and the latter, such as animal protein, vegetable protein, pulp waste liquid, and so on. Foamed concrete foaming agent, also known as a cement foaming agent, foam concrete foaming agent refers to an admixture that can reduce the surface tension of the liquid and generate a large amount of uniform and stable foam for the production foamed concrete.
2. What are the types of foam concrete foaming agents?
This type of foaming agent is made of rosin as the main raw material, and its application has long been common. The chemical structure of rosin is relatively complex, containing rosin acids, aromatic hydrocarbons, aromatic alcohols, aromatic aldehydes, and oxides. Rosin resin foaming agent is also known as an air-entraining agent. Its main varieties are rosin soap and rosin homopolymer. It was initially developed and applied as an air-entraining agent for concrete mortar and later expanded to be used as a foaming agent for foamed concrete.
(2) Synthetic class
Following the rosin-based foaming agents, various synthetic surfactant-based foaming agents have been developed. This type of foaming agent has been widely used in cement foaming abroad since the 1950s. Among various synthetic surfactant foaming agents, the anionic type is generally welcomed due to its fast foaming and large foaming multiple. The cationic foaming agent is expensive and has a certain influence on the strength of cement, so it is not used much.
(3) Protein active substance type
The protein-based foaming agent is the current high-grade foaming agent with good performance and good development prospects. From the general development trend, it will occupy a larger and larger proportion in the application in recent years. Although its price is high, mostly above 15,000 yuan/ton, it will still be accepted by the market due to its better performance.
There are many foam concrete foaming agents, but there are only three or four common ones. The use of foamed concrete foaming agents can accelerate the formation of concrete and quickly make the concrete reach the standard of use, thereby promoting the progress of the entire construction project. , The development of foam concrete foaming agents has gone through a long process, and it is currently widely used in construction projects.
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Southern Copper Corp (SCCO.N) recently said its Peruvian mine remained closed after a six-week standoff with protesters and blamed the Peruvian government for failing to intervene in the safety of its 1,300 workers and their families.
The company said in a statement that a recent agreement to end protests at the Cuajone mine required the company to withdraw complaints against protest leaders because railways transporting minerals and supplies remained blocked. Production has been suspended since the end of February.
Peru's Energy Ministry said in a separate statement that it had also reached an agreement with Southern Copper to start talks to find common ground with local communities.
"If we shut down for a year, the government will stop receiving more than 3.1 billion soles ($830 million) in taxes and royalties, and 8,000 direct and indirect jobs will be lost. This is what we want to avoid, "Southern Copper added in the statement.
Peru has faced a wave of protests from indigenous communities, who accuse mining companies of not providing enough jobs and funding to poor local residents.
Central bank officials said last week that protests against copper mines such as MMG's Las Bambas and Southern Copper's Cuajone were dragging down the economy.
Peru is the world's second-largest copper producer and mining is an important source of tax revenue for the country. It is estimated that the supply and prices of the foam concrete will be influenced by that.
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