Method for producing white carbon black by using high alumina fly ash and system thereof

Abstract

The invention discloses a method for producing white carbon black by using high alumina fly ash and a system thereof, relating to the technical field of material and chemistry. The invention comprises a fly ash slurry blending system, a fly ash pre-desiliconization system, a white carbon black preparation system and a caustification system. the structure is characterized in that the sleeve heater is divided into two sections; the outlet passage at the lower part of a heat preservation stay pot is divided into two paths; the solution outlet of a tube type falling film evaporator is connected with one inlet of a circulating mother liquor preparation tank through an evaporating solution pump, and one of the other two inlets of the circulating mother liquor preparation tank is alkali supplementing passage and the other thereof is connected with the outlet of a caustification tank through a caustification solution pump; the outlet passage of the circulating mother liquor preparation tank is connected with the inlet of a fly ash slurry preparation tank through a circulating mother liquor pump, so that the whole system forms a closed circulation. The invention is simple in process, low in production cost, low in energy consumption, and stable in performance of the products, meanwhile the fly ash of which white carbon black is extracted out can be used for preparing aluminium oxide as an important aluminium resource.

Description

technical field [0001] The invention relates to the technical fields of materials and chemicals, in particular to a method and a system for producing white carbon black by using high-alumina fly ash. Background technique [0002] White carbon black, namely hydrated silicon dioxide, a white powdery amorphous hydrated silicon dioxide with the chemical formula mSiO 2 ·nH 2 O, is currently the best white, transparent reinforcing filler with excellent reinforcing properties. As an important fine inorganic chemical product, it is widely used in various fields such as rubber, plastics, pesticides, paints, pharmaceuticals, papermaking, and daily chemicals. [0003] In the prior art literature, there are acid method and alkali method about the process of preparing white carbon black from fly ash. The acid method is to dissolve the fly ash with hydrochloric acid to remove aluminum, and then the residue is prepared by alkali pyrolysis to prepare water glass, and then hydrochloric aci...

AI Technical Summary

Problems solved by technology

Its disadvantages are: there are many process steps, the reaction process conditions are difficult to control, and hydrochloric acid is easy to pollute the environment

Its disadvantages are: complex process, high requirements for condition control, and high energy consumption

This method has many production steps and is cumbersome, and the performance of the obtained silica cannot be guaranteed

In addition, the invention patent with the application number of 200610012780.7 "Method for extracting alumina from fly ash and co-producing white carbon black", the disclosed technical solution is to use activated fly ash and ammonium sulfate to react and filter the residue, and rehydrogenate Sodium oxide solution is reacted to produce water glass, and then sulfuric acid is added to prepare white carbon black. The process is complicated. The acid method is used to prepare white carbon black. The conditions of the reaction process must be strictly controlled, otherwise the performance of the product will vary greatly.

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