The mineral processing plant is designed by Sinonine company, the design scale is 120tpd, the actual production capacity is 150tpd, and the annual processing capacity of ore is 45000Mt. This production line uses flotation method to produce gold concentrate as the final product.
This beneficiation plant is arranged in the middle area which is relatively flat and wide ravine, 180m long from north to south, east-west width of 50m. The area of the mineral processing plant (including high water pool) 8324m2. This plant is mainly composed of ore yard, crushing workshop, grinding&flotation workshop, dewatering workshop, distribution room, Plant Road, reagent warehouse and office living area etc. Plant natural elevation in 430m-450m, vertical layout design according to take steps, from north to south in the crushing workshop of ore yard platform,crushing&screening workshop platform, grinding &flotation building platform, dewatering workshop platform, design elevation were 447.15m, 440.00m, 436.40m, 434.50m. Field leveling earthwork excavation and filling 2200m3: 6100m3. Figure 1 is the general layout of the beneficiation plant.
Figure1.Gold ore beneficiation plant general layout
2.mineral processing technology
Tthe process flowsheet of the production line is shown as fig2, including crushing, screening, grinding classification, flotation and dewatering operation, etc, according to a series of layout. The final process is as follows:
Figure2.gold ore beneficiation plant flowsheet
The production line adopts two sections of a closed-circuit crushing, crushing and screening process before the pre arranged inspection, raw ore particle size is -300mm, from the warehouse to Plant forklift, from the feeder into thejaw crusher are crushed, the product by thebelt conveyor to thevibrating screen, screen product by the belt conveyor to thesping cone crusher finely, after crushing material return screening operation, the formation of closed, undersize (-15mm) sent to the fine ore bin. Figure 3 is the equipmentarrangement for the crushing& screening workshop.
Figure 3 Crushing& screening workshop
2）grinding &classifing process
The grinding classification consists of the closed loop cycle of the grid ball mill and the spiral classifier. The grinding fineness is -0.074mm 65%, and the overflow of the classifier enters the roughing flotation machine.
Figure 4.ball mill and spiral classifier
The beneficiation plant adopts the flotation process,the flotation machines include one roughing, three cleaning and two times roughing. The grinding materials were roughed, rough selected foam was selected for three times cleaning to get gold concentrate, the tailings were returned up in ascending order, the roughing tailings were scavenged for two times, the cleaned concentrate was returned up in turn, and the tailings after flotation were transported to the tailings pond. Figure 5 is the equipment arrangement drawing of ball mill &classification and flotation workshop.
Fig5.grinding &flotation workshop arrangement
After concentrating the concentrates, the gold concentrate is dehydrated by vacuum disk filter, and the water content of the concentrate is less than 20%.
4.Water supply and drainage
The total water consumption of the project is Q=325.84m3/d=13.58m3/h,
The amount of
1) circulating water is Q=282.96m3/d=11.79m3/h;
2) the production of new water is Q=29.76m3/d=1.24m3/h;
3) water consumption Q=10m3/d=0.42m3/h;
4)unpredict amount of water Q=3.12m3/d=0.13m3/h;
5) the water consumption of outdoor fire is 20L/s, the number of fire is once, the duration is two hours, and the amount of water consumption in fire fighting is 144m3. Figure 6 is the water balance flowsheet.
Figure 6. gold ore beneficiation plant water balance flowsheet
6. main equipments list
The production line is equipped with reasonable equipment according to the design process. The equipment is installed smoothly and the operation is good. The main equipment is shown in the table below.