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Recovery of colemanite from tailing using a knelson concentrator

Savas M.

Physicochemical Problems of Mineral Processing

2016

Vol. 52, iss. 2

1036--1047

Tailing from colemanite concentrators in Emet Boron Works contains significant amounts of boron and cause potential environmental problems. Therefore, the recovery of colemanite from these tailings is imperative to ensure no pollution of the environment. In addition, the tailings also have economic importance as a secondary resource due to their high content of B2O3. This study was undertaken to investigate the possibility of recovering colemanite from tailings using a Knelson concentrator. After samples in size of -1 mm and 0.5 mm were obtained from tailings (-3 mm) by comminution, these three different samples were placed into a Knelson concentrator. In addition to particle size, the effects of fluidization water velocity and bowl speed on the performance of the enrichment process were examined. A concentrate with a B2O3 content of 34.2% was produced with a recovery of 78.3% from tailings with a B2O3 content of 24.8%. Increasing the bowl speed improved the B2O3 recovery. Increasing the fluidization velocity or reducing the particle size adversely affected the recovery percentage. The enrichment process also permitted the removal of any residual As and Fe.

Produkcja cementu belitowego z dodatkiem czerwonych szlamów i materiału odpadowego zawierającego bor

Kavas T., Angelopoulos G. N., Iacobescu R. I.

Cement Wapno Beton

2015

R. 20/82, nr 5

328--334

Celem doświadczeń opisanych w pracy było zbadanie możliwości zastosowania dwóch odpadów czerwonego szlamu z produkcji aluminium oraz borowego odpadu z produkcji boru do wytwarzania belitowego cementu. Otrzymane wyniki potwierdziły przydatność tych odpadów do produkcji tego cementu. Stosunkowo duża zawartość boru w odpadzie z jego produkcji spowodowała zwiększenie udziału fazy α’ Ca2SiO4 w klinkierze, która, obok belitu, ma korzystny wpływ na rozwój wytrzymałości cementu. Surowce o modułach nasycenia 0,76; 0,81 i 0,87 prażono w piecu w temperaturze 1300°C i szybko chłodzono w powietrzu. Otrzymany cement, po zmieleniu klinkieru z gipsem, spełniał wymagania klasy 22,5 według normy EN 14216.

The main goal of experiments, presented in this paper, was to check the possibility to use two wastes: red mud from alumina production and boron waste from boron production, for belite cement production. Obtained results were confirming that both wastes can be applied in belite cement production. Relatively high content of boron in BW waste was causing the increase of a' polymorph of Ca2SiO4 in clinker, which beside belite had a positive effect on cement strength development. Raw mixes with Lime Saturation Factor 0.76, 081, and 0,87 were burnt at 1300°C and quickly cooled in air. Clinker ground with gypsum addition was assuring cement properties fulfilling class 22.5 according to EN 14216 Standard.