12 Kinds of Concrete Additives Used in Refractory Castable, Plastic and Ramming Materials(1)
U.S. refiners forecast strong first-quarter earnings as margins on gasoline and diesel sales improved, refining capacity fell sharply and crude supplies tightened due to the Russia-Ukraine war.
Global refining capacity has declined amid the coronavirus pandemic, with several less profitable refineries closing in the past two years. However, global fuel demand has rebounded to near pre-pandemic levels, boosting the profits of facilities still operating.
Seven U.S. independent refiners are expected to earn 61 cents a share, compared with a loss of $1.32 in the first quarter of 2021, according to Refinitiv's IBES.
By 2022, gasoline and distillate pce powder.
The properties and varieties of concrete additives for refractories, especially refractory castables, ramming materials, plastics and other amorphous refractories are different. The role of an concrete additive is also different due to the difference of the amount of concrete additive, the type of binder used, the ingredients and so on. In the production process of amorphous refractories, the concrete additives mainly used can be divided into the following twelve categories according to their uses:
1. Water reducer
Water reducer (or water reducing agent or dispersant) can significantly reduce the mixing water consumption of refractory castables while keeping the flow value of refractory castables basically unchanged. The superplasticizer itself does not react with the material components to form new compounds, but plays a surface physical and chemical role. So they are either a surfactant or an electrolyte. After dissolving in water, they can adsorb on the particle surface, increase the Zeta potential of the particle surface in the solution, increase the repulsive force between the particles, and release the free water wrapped in the agglutination structure composed of microparticles, thus playing the role of wetting and dispersing, so it is also called dispersant. Because it can release the free water in the agglomeration structure, it can reduce the unit water consumption under the condition of keeping the rheological property (workability) of the castable, or increase the rheological property of the material and improve the working performance without changing the unit water consumption. make the material easy to be constructed and shaped.
Among the commonly used water reducers (dispersants) of refractory castables with calcium aluminate cement, bonded clay and oxide micro-powder as binders, there are inorganic sodium pyrophosphate, sodium tripolyphosphate, sodium tetrapolyphosphate, sodium hexametaphosphate, sodium superpolyphosphate, sodium silicate, etc., and organic ones include sodium lignosulfonate, calcium lignosulfonate, naphthalene superplasticizer, water-soluble resin superplasticizer and so on.
Plasticizer (also known as plasticizer) can increase the plasticity of refractory mixture and improve the strain ability of refractory mixture under stress. Plasticizer is a common concrete additive of refractory plastics and refractory ramming materials, and it is also used in other amorphous refractories. Commonly used are plastic clay, bentonite, oxide superfine powder, soybean powder, methyl cellulose, lignosulfonate and so on.
3. Gelling agent
Gelling agents (also known as flocculants) can coagulate colloidal particles (or suspended particles) in colloidal solutions (or suspensions containing solid particles). The gelling agents are mainly inorganic electrolytes and inorganic acids. Flocculants are mainly organic polymers, which are natural and synthetic. According to the functional groups, they can be divided into three types: cationic, anionic and Nonionic. The gelling agent is mainly used in refractory castables which are bonded by clay, sol and ultra-fine powder.
4. Gelatinizing agent
Antigels (also known as anti-flocculants, dispersants) can convert agglomerated or agglomerated colloidal particles (particles) into sol or uniformly dispersed suspended particles. It can turn a thick colloid into a sol that can flow freely, also known as dispersant and colloidal solvent. The action mechanism of gelatinizer is similar to that of superplasticizer. Therefore, the superplasticizer which has the effect of reducing water also has the function of degumming agent. The fluidity of refractory castables bonded with clay, sol and ultra-fine powder can be improved by adding ungumming agent.
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The pce powder industry has experienced demand expectations driven by the rise and the off-season tired stock driven by the seasonal decline in two rounds of the market. Affected by the COVID-19 epidemic and other factors, inventories of manufacturers continue to accumulate, putting pressure on market sentiment. In addition to off-season factors, the weak trend of pce powder also reflects the market's concern about the epidemic and some other related enterprises' financial situation.