Objetivo The aim of the project is to save energy in the pyrometallurgical treatment of nickeliferrous Laterites, upgrading them by rejecting the contained in the mass of the ore free silica waste, using physical methods.The results have been proved to be successful, as far as the aims set are concerned :a) Saving energy at a considerable amount as a result of :(1) by rejecting a certain amount of Silica waste (up to 15 ton/h or about 75.000 ton/year)(2) by decreasing the Silica (SiO2) percentage contained in the ore feed to the Metallurgical Plant.The resulting energy saving, on the assumption of a 24-h operation per day for 300 days per year, is 13.000 TOE.b) Improvement of the technical cost by increasing the metal recovery in the Metallurgy (increased Nickel content of the ore feed).c) Protecting the environment by rejecting less flue gases, dust and slag from the process of the ore in the Metallurigcal Plant :- less slag : 75.000 ton/year- less fuel gases : 75.000 x 1.09 = 81.750 ton/year- less flying dust : 75.000 x 0.085 = 6.375 ton/yearThe results of the Plant in detail were the following :(I) EFFICIENCIES BY WEIGHT (ON DRY BASIS)- Ore feed on the Dry Screen : 78 Ton/hour- Dry fine ore (Concentrate) : 35 Ton/hour- Wet concentrate : : 12 Ton/hour Sink + ore sand + ore slime : 28 Ton/hour- Waste rejects : 15 Ton/hour(II) RECOVERIESRecovery by weight (Concentrate) .... 80,77%Waste reject by weight................19,23%Nickel recovery.......................92,96%Fe....................................92,30%SiO2 reduction........................28,01%% Nickel imporvement..................14,60%% Fe..................................14,30%.The Dressing Plant has an annual capacity of processing 400.000 t/y of nickel laterite ore, producing 315.000 t/h of concentrate and 75.000 t/y of silica waste reject.The main phases of the beneficiation process are :1. Dry screening a part of the crushed ore (-30 mm) at 3 mm. Up to 7 mm depending on the ore's moisture content.2. Wet scrubbing of the above oversize.3. Wet screening at 0.5 mm (a percentage of fines are concluded in the above size because of dry screening)4. Dense media separation at the size - 30 mm + 0.5 mm between the ore pieces and the silica waste which is being rejected. (TRO-FLO separator)5. Cyclone separation of the - 0.5 mm size of the ore with the following products :a) The underflow of the cyclons (- 500 u + 80 u : ore sand) is taken with the sink concentrate.b) The overflow of the cyclons (- 80 u : ore slime) is driven to lagoons which they are taken from after sedimentation of the ore fines and physical drying.The concentrate being producedis consisted of the following ones :a) Dry fine ore from the Prescreening phase (- 3 mm)b) The sinks of the Dense media seapration plant section (-30 mm + 0.5 mm)c) The ore sand (- 500 u + 80 u)d) The ore slime (- 80 u). Programa(s) ENG-ENDEMO C - Programme (EEC) of demonstration projects and industrial pilot projects (EEC) in the energy field, 1985-1989 Tema(s) 3.4 - INDUSTRY Convocatoria de propuestas Data not available Régimen de financiación DEM - Demonstration contracts Coordinador GENERAL MINING & METALLURG. (LARCO) Aportación de la UE Sin datos Dirección AMALIAS AVENUE 20 10557 Athens Grecia Ver en el mapa Coste total Sin datos
