The Experimental Studies On Coal-water Slurry By Adding Paper-making/Modified Black Liquor

Black liquor is viscous and stiff waste component, which is generated by concentrating waste liquor which is produced in the process of pulp and paper industry. Black liquor has been bringing about a lot of serious harm on environmental pollution of china, because it is not easily resolved and degraded, and it can send out foul-smelling gas. It is urgent to solve paper-making black liquor in a comprehensive way, because experimental pollution has been seriously harmed. Lignin, humus acid and hemicellulose of the black liquor have the function of surface-active agent, so we can directly use the black liquor instead of water and additive to preparing coal slurry. Coal slime is viscous and stiff waste component whicn contain superfine powdered coal, gangue pulverization, dirt and water, which is the byproduct in the process of coal. The output of coal slime will be increased quickly along with the rapid developmet of coal industry and mechanization. So coal slime accumulate on the ground, and is easily weathered by wind and water, which could cause serious black sandstorm. And it does also a lot of harm to the ground and air seriously. So we can directly use the black liquor instead of water and additive to prepare coal slurry with coal slime and coal. Thus the discharge of paper-making black liquor and coal slime is improved effectively, which could phase down environmental pollution and cut down the cost of production for preparing coal slurry. Therefore we could achieve the goal of making use of black liquor and coal slime, and will benefit our economy as well as our community.This paper mainly study the slurry of preparing coal-water mixture by using blackliquor, coal slime and coal, and aims to study the function of surface active agent in black liquor, which all treat and utilize black liquor effectively. We should increase production and economize as much as possible, and reduce emission of carbon and environmental pollution. First, the black liquor which was made into different dilution times and coal slime were made into the coal black liqour slurry with excellent performance, and then maximum slurry concentration, rheology, static stability, calorific value, and changing the pH of black liquor on the properties of black liquor coal slurry were investigated. Then the properties of black liquor coal slurry by black liquor and coal. Finally, the black liquor was modified by sulfonation, then modified black liquor and coal slime and coal were made into coal slurry, and compare the coal slurry of unmodified and modified black liquor. It has been shown by c that the function of surface active agent in black liquor is very good on preparing coal-water mixture, which can act active function well. And modified black liquor of coal slurry is better than unmodified on surface active agent. The main conclutions are summarized as follows:1.Study of preparing slurry by using black liquor and coal slime Black liquor, which come from Shang Xi Hong Chang Agricultural Trade Limited Company (1#black liquor) and Shang Xi He Sheng Industry and Commerce Limited Company (2#black liquor), and coal slime was made into coal-water slurry, which is investigated. When the add content of1#black liquid is7.2%and the particle size of powdered coal is less than160item, the concentration of coal water mixture prepared is67.44%, liquidity will be A grade and the stability will retain almost20day in good condition. When the addition of2#black liquor is12.5%, the concentration of coal water mixture prepared is67%, liquidity will be A grade and stability will retain more than a week. The experiments showed that the effect of pH on2kinds black liquor slurry is small, by investigating black liquor slurry on changing pH. However, on the whole,1#black liquor slurry is better than2#black liquor slurry.2、Study of preparing slurry by using black liquor and coal1#black liquor, and Shan Xi local coal (Lin Fen, Li Shi, Jin Yang, Tai Yuan) was made into coal water slurry, whose slurry was investigated. Afer comparative experiments, it is indicated that the slurry of black liquor and coal is very good and dispersant of black liquor is proved well. When the addition of black liquor is12%, the concentration of coal water mixture prepared with coal is64%, whose slurry is best and tability will retain more than10days. The experiments also showed that the effect of pH on black liquor slurry with coal is not big.3、Modified black liquor by sulfonation and its black liquor slurry 1#black liquor was modified by sulfonation. The effect of sulfonated temperature and sulfonated time on coal slurry is investigated. It is shown by experimental investigation that when the ranfe of sulfonated temperature is75～100℃and reaction time is30～40min, the apparent viscosity of modified black liquor slurry is not relatively big, whose liquidity retain excellent. Compared to unmodified black liquor, modified black liquor slurry is relatively better on liquitity, and its stability has been increased3～5days.