Method for preparing white carbon black by using oil shale ash

Abstract

A method of manufacturing carbon white using bituminous shale ash comprises the steps of: 1)crushing the bituminous shale ash; 2) mixing the crushed bituminous shale ash with NaOH solution to react for 0.5~24 hours at 20~200 DEG C with an agitating speed of 100~800 r / min; 3)dividing the reaction solution into two parts, an alkali solubility part and an alkali insolubility part, by means of vacuum filtration; 4) adding dispersant into the filtrate, adjusting the pH value to 3.0~10.0 using sulfuric acid or chlorine hydride, and agitating for 0.5~4 hours using a magnetic stirrer; 5) standing and aging for 0.5~24 hours, wherein white floc is generated; 6) filtering; 7)vacuum drying of the filter cake at a temperature of 40~80 DEG C. The present invention produces qualified carbon white with a simple technology and realizes the ecology utilization of bituminous shale ash.

Description

technical field [0001] The invention relates to a method for preparing white carbon black by using oil shale ash as a raw material. Background technique [0002] White carbon black, also known as light silica, scientific name precipitated hydrated silica. It is a high-tech inorganic fine chemical product, the main component is SiO 2 , performance is similar to carbon black, the appearance is white amorphous fine powder. The manufacturing methods of white carbon black include gas phase method, precipitation method and non-metallic ore dissociation method. The gas phase method is also called the combustion method, and the product is gas phase silica. The quality of the product is high, but because the raw material uses expensive SiCl 4 , the requirements for equipment and process are harsh, and the SiO of the obtained silica product 2 ≥99.8%, specific surface area> 300m 2 / g, but its price is expensive and its application is limited. Precipitation method The traditio...

AI Technical Summary

Problems solved by technology

Tan Xin et al. studied the preparation of silica by using oil shale deoiling residues. Since this process uses calcination and acid leaching to prepare silica, compared with the process of preparing silica by traditional precipitation method, there are some disadvantages in this process. The process route is long, the energy consumption is large, etc. In addition, the preparation of white carbon black by the acid method requires a large amount of acid, the cost is high, and the iron ions are not easy to remove, thus affecting the whiteness.

Images