Coal slime argillization inhibition method based on adjustment and control of solution chemical properties

Abstract

The invention discloses a coal slime argillization inhibition method based on adjustment and control of solution chemical properties. Inorganic salt is utilized to change the chemical properties of water body solution during the coal washing process so as to inhibit clay argillization and coal slime argillization in coal. The coal slime argillization inhibition method comprises the following step: adding an argillization inhibitor, along with supplementary water, in a coal washing system, wherein the adding site of the argillization inhibitor is a water tank of supplementary water of a coal preparation plant; the argillization inhibitor is one selected from natural gypsum, halogen piece or halogen powder of magnesium salt, or industrial high-salt waste water; the adding amount of the argillization inhibitor ensures that the conductivity of coal slime water is greater than or equal to 1.5*10<3> [mu]s / cm during the entire cyclic process. The argillization inhibitor added during the coal washing process can effectively prevent clay particles in coal from hydration swelling and dispersion and has the effects that the argillization process of coal slime is blocked, and the settling property of coal slime water and the dehydration property of coal slime are improved. The coal slime argillization inhibition method has the following advantages: clay and coal slime in coal are prevented from argillization from source; the method is simple and practicable, remarkable in effect, and suitable for washing of coal containing expansive clay.

Description

technical field [0001] The invention relates to a method for suppressing slime slime, in particular to a method for suppressing clay slime in coal during the coal washing process. It is especially suitable for the washing process control of easily muddy coal, such as lignite, bituminous coal and other low-rank coals. Background technique [0002] Clay is the main impurity mineral in coal, and its content can account for more than 60% of the impurity mineral content in coal. Common clay types in coal include kaolinite, montmorillonite, illite and illite-smectite mixed layer. Among them, kaolinite is the most common and most abundant. The content of montmorillonite in raw coal is relatively small, but because the force between the crystal layers is the van der Waals interaction energy, water molecules can easily enter the crystal layers in the form of permeation and ion hydration membranes, making the crystal layers swell and disperse into micron-sized particles. unit layer...

AI Technical Summary

Problems solved by technology

Adding organic polymer clay stabilizer, cationic groups will inevitably flocculate clay and coal particles together, thus affecting the separation effect of coal slime