According to Zhou Shan, from the results of the screening of the test ore, it is more than +0.154mm, accounting for 10.05%, and the grain size is coarse. The collectors used in the test were MOH and MOH-2, and the concentration of the preparation was 10%. Sulfuric acid was added as a modifier in the test, and a solution of 5% (w/v) was added for the addition. Because the test ore contains a small amount of sulfide ore, so MB was added to the test for flotation, and the concentration was 5%. 2# oil was added as a foaming agent in the floating sulfur working section, and the concentration was increased by 100%.
In the test, MOH, MOH-2, and MOH and MOH-2 were mixed in a ratio of 1:1 (hereinafter referred to as a mixed collector) for comparison test.
The rough selection section of the open circuit test is added according to the chemical system obtained by the conditional test. The selected operation section controls the amount of sulfuric acid step by step, and the controlled concentrate reaches 47% in the Jing 2 operation section, and the concentrate is calculated by the analytical test value of each product. Recovery rate indicator.
In the test, the chemical conditions of the floating sulfur operation section were fixed to 1200 g/t of sulfuric acid, 300 g/t of MB300g/t, and 80 g/t of 2# oil, and the initial fixed collector was added at 1800 g/t.
When the amount of sulfuric acid added increased from 1200g/t to 1300g/t, the recovery rate of concentrate was slightly decreased, but the grade of concentrate was greatly improved. When the amount of sulfuric acid was 1400g/t, the grade of tailings was high, concentrate The recovery rate was low, so the amount of crude sulfuric acid was determined to be 1300 g/t.
When the amount of sulfuric acid added is 1000g/t, the recovery rate of concentrate is high, but the concentrate grade is lower than that of sulfuric acid at 1100g/t. Considering that the flotation process has only two selections, it ensures high recovery rate of concentrate. Under the premise, it is advisable to use a pharmaceutical system with a higher concentrate grade; when the amount of sulfuric acid is 1200g/t, the grade of tailings is high and the recovery rate of concentrate is low, so the amount of crude sulfuric acid is determined to be 1100g/t.
When the amount of sulfuric acid added increased from 1000g/t to 1100g/t, the recovery rate of concentrate was slightly decreased, the grade of tailings was similar, and the grade of concentrate was higher than that of the former. When the amount of sulfuric acid was 1200g/t, the grade of tailings was higher. High, the recovery rate of concentrate is low, so the amount of crude sulfuric acid is determined to be 1100g/t.
When the amount of sulfuric acid is fixed at 1300g/t, the grade of tailings obtained when adding MOH collector is 1600g/t, and the recovery rate of concentrate is low. The tailing grade obtained by adding MOH1800g/t is suitable, and the concentrate is fine. The recovery rate is higher, and the tailings grade is similar to that of 1800g/t when the collector is added to 2000g/t, and the recovery rate is only slightly increased. Therefore, the amount of MOH collector is fixed at 1800g/t.
When the amount of sulfuric acid was fixed at 1100g/t, the recovery rate increased with the increase of the amount of collector, the grade of concentrate decreased, and the grade of tailings decreased slightly. Considering the short selection process, MOH-2 It is suitable to fix the amount of collector at 1800 g/t.
When the amount of sulfuric acid is fixed at 1100g/t, the grade of tailings obtained when adding mixed collector 1800g/t is lower, and the recovery rate of concentrate is high, and the grade of tailings decreases when the collector is added to 2000g/t. Smaller, the recovery rate has not increased, indicating that the amount of mixed collector is sufficient at 1800g / t, so the amount of mixed collector is fixed at 1800g / t.
A suitable crude selection system was obtained from the conditional test. MOH rough selection system: 1300g/t of sulfuric acid and 1800g/t of MOH; crude chemical system of MOH-2: 1100g/t of sulfuric acid and 1800g/t of MOH-2; coarse selection of mixed collector Pharmacy system: the amount of sulfuric acid added was 1100g/t, and the amount of collector added was 1800g/t.
The final test results are as follows: when the ore grade of MOH collector is 26.39%, the flotation concentrate is 47.25% and the recovery rate is 81.32% after flotation and flotation. The recovery rate is 81.32%. MOH-2 capture When the ore grade is 25.98%, the flotation concentrate grade is 47.69%, the recovery rate is 80.01%, and the recovery rate is 80.01%. The mixed collector is 26.29% when the original ore grade is 26.29%. The sulfur and one coarse and two fine open-circuit flotation, the flotation concentrate grade is 47.94%, and the recovery rate is 83.89%.
Overall, for the ore-selecting mine, after the flotation operation and a coarse and two fine open-circuit flotation, MOH, MOH-2 and the mixture of the two have achieved good selection indicators, but from the nature of the medicament. In terms of angle, MOH-2 has better effect on coarse flotation than MOH. It is better to use MOH-2 flotation or MOH combined with MOH-2.
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