May I ask about the dosage of coal slurry additives? Which additive is cost-effective?

Papermaking waste liquid – the most cost-effective option. Lignin content is around 8%. It has an unpleasant odor; the quality may also be inconsistent. If it is prepared locally, the cost might be higher. It seems that in our case, the liquid is already prepared elsewhere and then directly poured into the storage tank

1# Wang Hao – You can contact this manager: Hui Youshe, phone number 13991640073; they specialize in the production of coal slurry additives.

May I ask the Fang family: We purchased an additive with a concentration of 38%, and after purchasing it, we prepared a solution with a concentration of 5%. This approach is clearly not economical; apart from purchasing papermaking waste liquid directly, are there any other alternatives?

Still no result. All I know is that my formula consists of the original substance and water in a ratio of 1:14; as for what that substance is, its cost-effectiveness remains unknown.

The additives from Nanda’s surfactant center are good; Linggu is also using them now. Pulp production from waste liquid is very unstable.

We generally use papermaking waste liquid, which is subjected to slight treatment; it is the most cost-effective option, with a lignin content of around 8%

NANJING UNIVERSITY has fairly good technology. Shanghai Coking also has its own additives produced.

This post was last edited by xuqinger on 2009-7-26 at 14:53. The rheology of water-coal slurry is an important property that affects its atomization and combustion characteristics. High-quality water-coal slurry not only has a high concentration but also exhibits good shear-thinning behavior, ensuring that the slurry has excellent pumping and atomization properties. This, in turn, reduces the energy required for transporting the water-coal slurry and improves its combustion efficiency. Since coal is hydrophobic, the main function of the additive is to improve the hydrophilicity of the coal surface, reduce the surface tension between coal and water, thereby allowing the coal particles to be fully wetted and evenly dispersed in a small amount of water. This improves the flow properties of the water-coal slurry and reduces its viscosity, while also ensuring that the coal particles remain evenly dispersed in water over time. In water-coal slurry, different types of coal require different additives, and the amounts and methods of addition also vary. Additives usually include dispersants, stabilizers, and other auxiliary chemicals. Dispersants and stabilizers are essential in the preparation of water-coal slurry. Dispersants can promote the uniform dispersion of the dispersed phase in the dispersion medium by reducing viscosity. The mechanism of action of dispersants can be considered from three aspects: wetting and dispersion, electrostatic repulsion for dispersion, and steric hindrance and entropy-driven repulsion for dispersion. Most dispersants are surfactants, consisting of a hydrophobic group and a hydrophilic group. When dissolved in water, the hydrophilic group is attracted by water molecules, while the hydrophobic group is repelled by them; as a result, the hydrophobic groups arrange themselves at the water surface, with their hydrophobic ends facing the gas phase and their hydrophilic ends submerged in water. When water contains hydrophobic substances such as coal dust, it will also arrange itself in an orderly manner on the surface of the coal dust, thereby effectively dispersing the coal dust particles. Dispersants can significantly reduce the surface tension of water and improve the wettability of the coal particle surface. The role of stabilizers is to ensure the stability of the water-coal slurry, that is, to maintain its uniform properties during storage and transportation. Water-coal slurry is a coarsely dispersed system composed of solid and liquid phases; the forces of molecular Brownian motion, the van der Waals forces between particles, and the electrostatic attraction between particles are all insufficient to prevent the particles from settling. Stabilizers, on the other hand, enable the dispersed particles in the water-coal slurry to bond with surrounding particles and water to form a three-dimensional structure that is weak but still possesses a certain degree of strength. This structural framework exerts mechanical resistance to the settlement of particles, thereby ensuring the stability of the water-coal slurry. Generally, inorganic salts, polymeric organic compounds, and the like are used as stabilizers. At present, our country has successfully developed three types of chemical agents that can alter the surface properties of coal and facilitate better adsorption of additive molecules on the coal powder surface, for use as stabilizers in the preparation of water-coal slurry. Based on the addition dose, what percentage of the total weight of the coal slurry do the additives we add typically account for?