Modified fly ash, preparation method thereof, and preparation apparatus thereof

Abstract

The invention provides a preparation method of modified fly ash. In a sealed negative-pressure system, fly ash is adopted as a raw material. When winnowing grading processing is carried out upon the fly ash particles, the graded fine particles and ultra-fine particles are subjected to a chemical-spraying surface modification treatment; the obtained products are heated and dried, such that a target product of the modified fly ash is obtained. According to the modified fly ash provided by the invention, one or more saturated-structure or unsaturated-structure organic groups are bonded on the surfaces of the particles, and an activation index is higher than 0.9. The invention also discloses a fly ash sorting and modifying apparatus. The technical method provided by the invention is energy-saving and environment-friendly, and is advantaged in high utilization rate of fly ash. The obtained modified fly ash is advantaged in wide particle fineness selection range, small dosage of a coupling agent, uniform distribution of the coupling agent, good adaptability with polymer substrates, and the like. In rubber product filling, the modified fly ash can be used for completely replacing calcium carbonate and powdered steatile, or partially replacing carbon black. The modified fly ash is a renewable resource material with low cost and high quality.

Description

technical field [0001] The invention relates to the technical field of filler processing for rubber products, in particular to a method for preparing modified fly ash, its classification and surface treatment, and a device for realizing it. Background technique [0002] Fly ash is a solid waste discharged from coal-fired thermal power plants. It is a dispersed system composed of particles of different structures and shapes. The main chemical components of fly ash are silicon, aluminum, iron oxides, a certain amount of calcium, magnesium, sulfur oxides, traces of copper, chromium, lead, etc., and unburned carbon particles. The total annual discharge of fly ash in the country has exceeded 100 million tons, and less than 50% of it has been utilized. A large amount of fly ash is accumulated in the ash yard, which not only occupies land resources, but also pollutes water quality and the environment. Untreated fly ash can only be used as raw materials for building materials, such...

AI Technical Summary

Problems solved by technology

The defect of the prior art is that the modifier is directly added in the production of rubber and plastic products, the dosage is large, the distribution on the surface of the particles is uneven, the energy consumption of the grinding process is high, the particles are not spherical and have sharp edges, and the residual amount of iron oxide is large , and poor sealing of the production process or processing equipment causes fine particles to fly into the atmosphere, etc., which affects the filling effect and the appearance and quality of the product, such as frosting on the rubber surface, decline in mechanical strength, etc., and seriously restricts the modification of pulverized coal. Large-scale production of ash and popularization and use in rubber and plastic industry

As disclosed in the patent CN 1156334C, the method and equipment for segmental extraction of fly ash micro- and nano-sized particles have not yet solved the problem of surface modification of fly ash particles, and still affect the effect of directly adding and using it in rubber and plastics

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