The white carbon black produced by the precipitation method has uneven particle size distribution, and the purity is low, and the product quality is different. The advantages are early start, mature technology, simple preparation process and low cost. Preparation method of precipitated white carbon black: carbonization method, acidification method, non-metal mineral method, cellulose method, by-product recovery method, sol method, emulsion method, and the like. The conventional preparation of precipitated silica is prepared by neutralizing a silicate and a mineral acid to form hydrated silica, and then filtering and pulverizing according to the requirements of the finished product, such as carbonization and acidification.

2.2.1 Acidification
The acidification method for preparing white carbon black is the most traditional preparation method, and is a method for reacting soluble silicate with acid to remove sodium sulfate and water to obtain white carbon black. The reaction equation is: Na2O·SiO2+nH2O+2H+→SiO2·nH2O+ 2Na+ +H2O. The acidification process for preparing white carbon black is relatively mature. At present, the key to this technology breakthrough is how to obtain white carbon black with excellent performance like gas phase method.

2.2.2 Carbonization
In recent years, as the impact of the greenhouse effect has become more and more serious, people have begun to pay attention to the emission and utilization of carbon dioxide. In order to reduce the consumption of inorganic acids and protect the environment, many scientists at home and abroad began to use carbon dioxide instead of inorganic acid to react with water glass to prepare white carbon black. The carbonization process is simpler and easier to form. Compared with the acidification method, it can effectively recycle by-products, reduce the discharge of the three wastes, reduce the production cost, and improve the economic benefits and the environment.

2.2.3 Non-metallic mineral method
Common mineral silicon sources are mainly wollastonite, coal gangue, opal, hard kaolin, kaolin, halloysite, diatomaceous earth, bentonite, serpentine, quartz sand, fly ash, yellow phosphate rock, sea foam. Stone and so on. After crushing these ores, acid or alkali leaching, and then adjusting the pH, filtering, drying, etc., can be made to meet the standard white carbon black. Taking kaolin as an example: after the kaolin is pre-calcined to enhance its acid-soluble reactivity, acid can be used to leach the preparation of white carbon black [8].

The white carbon produced by the method is low in cost and lower in cost than the precipitation method, and on the other hand, it can produce high-performance nano-silica which is second only to the gas phase method. At present, due to the abundance of various non-metallic mineral resources, it is technically feasible, and there are certain prospects for efficiency. It is a hot spot of research and application.

2.2.4 Cellulose method
The cellulose raw material method is to prepare white carbon black from cellulose raw materials such as rice husk and chaff ash. The utility model has the advantages of sufficient source, low cost, no biological harmful impurities such as heavy metals, and is suitable for use in the people's livelihood industry; the radioactive element content is extremely low, and the application prospect in the electronic field is also extremely wide, so it is a preparation method of white carbon black with great market potential. .

2.2.5 by-product recycling method
The by-product recovery method mainly uses other by-products produced or reflected as raw materials to prepare white carbon black. Common raw materials include sodium fluorosilicate and silicon phosphate, a by-product of silicon phosphate. The production of white carbon black by this method improves the utilization rate of resources, and most of them have good economic and environmental benefits, but the quality of white carbon black is mostly low, and it is not suitable for producing high-quality, high value-added white carbon black products.