Volume No. 5 Issue No.: 3A Page No.: 707-716 January-March 2011

 

A NOVEL WAY OF UTILIZATION OF PULVERIZED COAL FLY-ASH AND RICE STRAW FOR MANUFACTURING OF LAMINATE BASE PAPER

 

Akhouri Sanjay Kumar Sinha *, Manohar Singh1 and Surendra Pal Singh2

1. Department of Chemical Technology, SLIET, Longowal, Sangrur, Punjab (INDIA)
2. Department of Paper Technology, Indian Institute of Technology, Roorkee (INDIA)

 

Received on : September 14, 2010

 

ABSTRACT

 

This novel study is based on using two solid waste materials, pulverized coal fly ash and rice straw for manufacturing of a valuable product, which is laminate grade colored base paper. The rice straw has been used as a potential source of fibrous raw material. The chemical and mechanical processes have been explored to extract cellulosic fibers from rice straw. Coal fly ash has been processed to give required properties of inert fillers in paper. Experimental study was carried out for manufacturing of laminate base paper. Fly ash is available world wide from coal based thermal power plants at zero cost and it contains nearly 35-70 % SiO2, 15-30% Al2O3, 1-10 % MgO, 1-10% CaO, 5-10% Fe2O3 and 1-2% TiO2. Fly ash can prove to be a very good filler for laminate grade colored base papers and other specialty papers where very high opacity is sought but whiteness is not important. The paper samples with 22 % filler shows an opacity of 99.6 % ISO, burst strength of 1.4 KPa.m2/g, and tear strength of 3.82 mN.m2/g. It will decrease the production cost of paper significantly. Rice straw is a fibrous lignocellulosic material obtained as agricultural residue and contains high amount of silicon dioxide (SiO2). Rice straw burning in agricultural fields is a serious environment pollution problem in north India and other parts due to not finding proper utilization. Utilization of rice straw will solve the problem of its handling and scarcity of fibrous raw material for pulp and paper industries. This is specifically a boon for countries cultivating rice in large quantity and generating pulverized coal fly ashes from thermal power stations.

 

Keywords : Fibers, Rice straw, Silica, Pulverized coal fly ash, Laminate base paper, Opacity, Burst strength, Air pollution

 

 

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