Process for producing super-fine high-purity white carbon from rice hull and burning heat

Abstract

A process for preparing high-purity superfine white carbon black from rice husk by the heat generated by burning the rice husk includes such steps as charring, acid treating, pulverizing, sieving, burning in a serial combustion system to obtain white carbon black and waste acid, and treating the waste acid for reuse.

Description

technical field [0001] Element content Organic matter % 69.1~77.6 Inorganic matter% 12~18 Moisture % 9~13 the element content C H O N S 33~38 4.0~4.7 30~35 0.15~0.47 0.03~0.23 SiO 2 91.3 (K, Ca, Mg, Fe, Al) oxides 8.7 - [0002] The calorific value, volatile matter, ash and moisture data of rice husk are similar to the indicators of boiler coal. According to the standard of coal calorific value, rice husk is considered to be a low-sulfur solid fuel with medium and low calorific value (ML). Because the bulk density of rice husk is very small, about 128Kg / m 3 , so storage and transportation are more difficult. Rice husks scattered and stacked in rural areas will pollute the environment, and the fly ash after burning is very harmful to the respiratory system of humans and animals. Therefore, concentrated burning of rice husks can not only make full use...

AI Technical Summary

Problems solved by technology

The above-mentioned combustion technologies have three common disadvantages: (1) SiO 2 Particles stay in the combustion zone for a long time, amorphous SiO 2 transforms into bulk crystalline SiO 2 , such as quartz, cristobalite and tridymite, whose powder flying can cause silicosis; (2) low combustion efficiency, in SiO 2 More than 10% of unburned charcoal remains in the pellets, and the product color is black ash and gray

(3) SiO 2 Particles corrode and scale the furnace body, affecting production

The resulting product still does not reach the quality of silica obtained by chemical precipitation.

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