LLC “Gipronikel” Institute, Saint Petersburg, Russia:

S. S. Ozerov, Researcher of Laboratory of Metallurgy, e-mail: SSOze@nikel.spb.su
A. B. Portov, Senior Researcher of Laboratory of Metallurgy
L. B. Tsymbulov, Head of Laboratory of Metallurgy

JSC “Kola MMC”, Murmansk Oblast, Zapolyarny, Russia:
A. K. Mashyanov, Deputy Chief Engineer on Pyrometallurgical Production Reconstruction

Nowadays, the section of briquetting of bulk copper-nickel concentrate is accepted for industrial operation in Kola MMC. Liquid technical lignosulfonate is used as a binder in briquetting. During the mastering of briquetting technology, there was set a range of problems, connected both with technological properties of binder, and with necessity of optimization of exploitation costs. Industrial control data set the episodic worsening of mechanical properties of briquettes (compressive strength and impact resistance) without any clear technological variations in the process. One of these possible reasons is the deviation of binding properties of lignosulfonate with supplier change. Besides, nowadays lignosulfonates, used as binders, are transferred from the category of cheap production wastes into the category of popular technical materials, which, simultaneously with deviation of strength characteristics, is negatively caused on industrial and economic constituent of the production stage. This paper searched the indirect indicators and criteria, which may be the basis of assessment of binding properties of lignosulfonate without any testings. Chemical composition, pH and slurry viscosity are the criteria, potentially influencing on binding properties of lingnosulfonate. According to the investigations there was set the grade of influence of each investigated indicator on the strength of obtained briquettes. One of the easiest controllable indicator is pH.

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