Sodium Lignosulphonate used as compound additiveof coal water slurry

Sodium Lignonsulphonate:

The so-called coal water slurry refers to the slurry made of 70% pulverized coal, 29% water and 1% chemical additives after mixing. It is a kind of fluid fuel, which can be pumped, atomized, stable fire combustion like fuel oil, and can be transported and stored for long distances. The calorific value is equivalent to half that of fuel oil. Even on the chain quick-loading furnace. Compared with gasification or liquefaction of coal, coal water slurry has much less investment and lower cost due to its simple processing method. It is now possible to make coal powder from coal washing into high concentration coal water slurry.

Chemical additives of coal water slurry actually include dispersant, stabilizer, defoamer and corrosion inhibitor, but generally refers to the dispersant and stabilizer two categories. The role of additives: on the one hand, the coal powder can be uniformly dispersed in the water medium in the form of a single particle, and at the same time, the hydration film can be formed on the surface of the particle, so that the coal water slurry has a certain viscosity and fluidity; On the other hand, the coal water slurry has a certain stability, prevent coal particles precipitation and crust phenomenon. The three essential factors of high quality coal water slurry are high concentration, long stable period and good fluidity. There are two key factors for the preparation of high quality coal water slurry: one is good coal quality and uniform distribution of coal particle size, the other is good chemical additives. Generally speaking, coal quality and coal particle size is relatively stable, really play a key role is the additive.

According to the degree of dissociation after being dissolved in water, coal water slurry dispersants can be divided into anionic, cationic, amphoteric and non-ionic types, and their price ratio is 1:3:4-2. For the consideration of cost performance, at present, the dispersants developed and screened at home and abroad are mainly anionic and non-ionic types, which are mainly naphthalene series, humic acid series, lignin series, polyacrylic acid series and related products.

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