Sains Malaysiana 44(11)(2015): 1561–1565

Precipitated Calcium Carbonate from Industrial Waste for Paper Making

(Kalsium Karbonat Termendak daripada Sisa Industri untuk Pembuatan Kertas)

ROHAYA OTHMAN*, NASHARUDDIN ISA & ANUAR OTHMAN

Mineral Research Centre, Minerals & Geoscience Department of Malaysia, Lantai 20,

Bangunan Tabung Haji Jalan Tun Razak, 50658 Kuala Lumpur, Malaysia

Received: 28 March 2015/Accepted: 3 July 2015

ABSTRACT

In this study carbide lime waste was used as raw material to produce precipitated calcium carbonate (PCC). Carbide lime is an industrial waste from acetylene gas industry which uses limestone in its production. The use of PCC as fillers in paper making can reduce the production cost and improve the paper properties such as opacity and brightness. PCC can be produced from carbide lime waste by ionic sucrose solution method. The sucrose solution of Brix 10° was first prepared by dissolving sugar (sucrose) in water followed by dissolution of carbide lime waste in the sucrose solution. The sucrose solution which had turned milky was then filtered to obtain a clear solution known as pregnant solution. The pregnant solution that contained calcium ions was subsequently used to produce PCC by introducing CO₂ gas into the pregnant solution. The process is known as carbonation. The PCC was then used as fillers in paper making. The production of PCC by using calcium hydroxide as starting material was also carried out for comparison purposes. Based on the results, PCC prepared from carbide lime had purity of 98.14% while the one prepared from calcium hydroxide had 98.66%. Meanwhile, analysis of the paper properties demonstrated that both products gave equally good results. This proves that PCC prepared from industrial waste can be used for paper making.

Keywords: Calcium hydroxide; carbide lime; industrial waste; PCC

ABSTRAK

Kalsium karbonat termendak (PCC) yang dihasilkan dalam kajian ini menggunakan sisa kapur karbida sebagai bahan mentah. Kapur karbida adalah sisa industri daripada industri gas asitelena yang menggunakan batu kapur dalam penghasilannya. Penggunaan PCC sebagai bahan pengisi dalam penghasilan kertas mampu mengurangkan kos penghasilan di samping menambah baik sifat kertas daripada segi kelegapan dan kecerahan. PCC boleh dihasilkan menggunakan sisa kapur karbida dengan menggunakan kaedah larutan ion sukrosa. Larutan sukrosa Brix 10° dihasilkan terlebih dahulu dengan melarutkan gula (sukrosa) ke dalam air, seterusnya sisa kapur karbida dilarutkan dalam larutan sukrosa. Larutan sukrosa yang telah menjadi keruh seterusnya ditapis untuk memperoleh larutan jernih yang dikenali sebagai larutan bunting. Larutan bunting yang mengandungi ion kalsium seterusnya digunakan untuk menghasilkan PCC dengan memasukkan gas CO₂ ke dalam larutan bunting tersebut. Kaedah ini dipanggil pengkarbonatan. PCC ini kemudiannya digunakan sebagai pengisi dalam pembuatan kertas. Penghasilan PCC menggunakan kalsium hikdroksida sebagai bahan pemula juga dijalankan untuk tujuan perbandingan. Berdasarkan keputusan, PCC yang dihasilkan menggunakan kapur karbida mempunyai ketulenan 98.14% manakala yang menggunakan kalsium hidroksida mempunyai ketulenan 98.66%. Sementara itu, analisis sifat kertas mendapati kedua-duanya memberi keputusan yang hampir sama. Ini membuktikan bahawa PCC yang dihasilkan daripada sisa industri boleh digunakan dalam penghasilan kertas.

Kata kunci: Kalsium hidroksida; kapur karbida; PCC; sisa industri

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*Corresponding author; email: rohaya@jmg.gov.my