The iron ore content of the flotation tailings in the plant is higher, followed by magnetic iron. The sum of the two accounts for about 91.97% of the total iron content of the total flotation tailings, and they are all useful minerals that can be recycled.
First, magnetic preselection analysis
For the pre-selection experiment of advanced flotation tailings, the pre-selection adopts the weak magnetic + strong magnetic sweeping process, the flotation tailings are firstly fed into the magnetic separator for weak magnetic pre-selection, and the weak magnetic tailings are fed into the high gradient vertical ring pulse magnetic separation. The machine performs strong magnetic sorting. The tailings re-election experiment was carried out under different magnetic field strengths. The results were compared. The analysis found that the strong magnetic tailings grade is low, so the strong magnetic pre-selection can be directly tailed.
Second, grinding - grading analysis
The pre-selected weak magnetic and strong magnetic mixed concentrate 1000g was used for the grindability analysis. The mixed concentrate grade was 21.85%, the grinding concentration was 70%, and the grinding time was 10, 12, 15min. According to the experimental results, we can see that after 15 minutes, the fineness of the product is similar to the fineness of the mixed magnetic concentrate in the production, which is good for sorting, and the resolution of the +0.053mm granular product is ideal in the Mo-returning monomer. Recycling.
Three and two sections of magnetic separation analysis
The magnetic separation (weak magnetic + strong magnetic) re-election of the grinding products is carried out to obtain the magnetic separation mixed concentrate. After the grinding, the iron grade of the magnetic separation concentrate in the two sections is greatly improved. The selection effect is ideal, and it is recommended to perform two-stage magnetic separation after re-grinding.
Particle size analysis of four or two mixed magnetic concentrates
The two-stage magnetic separation mixed magnetic concentrate was sieved, and the result was that the two-stage mixed magnetic concentrate had a low yield of 0.074 mm and a low iron distribution rate, and the mineral contained in the mineral was less, and the degree of monomer dissociation was higher. Suitable for flotation.
Flotation analysis of 5 and 2 sections of mixed magnetic concentrate
The two-stage mixed magnetic concentrate with iron grade of 36.11% was selected for 1 coarse 1 sweep 2 fine closed loop flotation experiments. It was found that after 1 coarse 1 sweep 2 fine flotation, the effect of extracting was remarkable, and the concentrate grade was greatly improved. The product concentrate rate and iron recovery rate are also improved, reducing metal loss and improving product resource utilization.
6. Selection and determination of process flow
According to the experimental analysis, the final determination of the process flow is 1 section of weak magnetic - 1 section of strong magnetic - grinding - 2 sections of weak magnetic - 2 sections of strong magnetic - 1 coarse 1 sweep 2 fine flotation process.
The Red Star machine found that the hematite flotation tailings in the plant had more recoverable minerals and serious metal loss. In order to realize the comprehensive utilization of resources, the re-election experiment was carried out, and the process flow was finally determined to be a weak magnetic field - 1 segment. Strong magnetic - grinding - 2 sections of weak magnetic - 2 sections of strong magnetic - 1 coarse 1 sweep 2 fine flotation process, and finally the iron concentrate grade, iron recovery rate, etc. have been greatly improved, realizing resources Comprehensive recovery, significant economic benefits.
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