How to judge the grade of iron ore intuitively?
Ore grade determination can be a very shallow dish (it can be skilled with the palm), will pour a little iron powder, add water, shake, the muddy water drained, (if iron is after flotation, the surface water after the bubble will appear, can use the mouth to blow out). Add water, until the water clear (basically three or four line), the rest of the iron if the color black to greasy hair, even feeling a little blue, it shows very good taste, in more than 65%; if the color is black, and there is no impurity particles such as quartz, grade should be above 60%. 60% the following is their own experience to judge.
The ore, because they do not know the mineral composition, light by density is not a good judge of ore grade, if can have a chunk of magnetite, broken into small pieces, with the magnet to absorb, can assume magnetic rate. If there is no fixed-point magnetic, it must be in the grade below 10%, to be sure, basically non magnetic ore, personal investment, it is to lose money.
Intuitively, the heavier the grade, the higher! The more black ore, the higher the grade!Iron and earth are different. Iron shines!
The weight of the charge! But the ore irregular you never knew if he had multiple, is heavy! So you get a graduated cup! The ore and see how much is this ore volume, then weighing with the weight divided by the volume density is denser! More good ore!