Application of New Type MY Collector in Beneficiation of a Lean Hematite

I. Introduction

A processing plant in western China lean hematite ore processing 500,000 tons of production a continuous grinding - strong magnetic separation - reverse flotation process. Because the ore is mainly composed of scaly lean hematite which is unevenly embedded in fine particles, and the size of the gangue mineral inlay is coarser than that of the iron mineral, the magnetic iron mineral in the ore is extremely small, and continuous Grinding, after a part of the tailings is removed by magnetic separation, the magnetic separation concentrate is fed to the mine as a reverse flotation operation, and the final concentrate is selected by reverse flotation operation. The reverse flotation adopts one rough selection, one selection, two sweeps, and the middle mine returns to the rough selection process.

At present, with the deep mining of the mine, the ore properties have changed, and the grade of ore is decreasing year by year, from 37% to 39% in the initial stage of the construction of the plant to 30% to 32%. Moreover, due to the unreasonable configuration of the original process equipment, it is unable to exert its due efficiency, coupled with the decline in the selected grade, the increase in the beneficiation ratio, the increase in raw materials and energy consumption costs, and the decline in the efficiency of the plant selection. In order to improve the efficiency of mineral processing in the plant, rational use of mineral resources, use of new flotation reagents to improve production technical indicators, and achieve the purpose of improving the economic benefits of the enterprise, the plant entrusted the Sinosteel Maanshan Mine Research Institute to conduct the lean hematite. Flotation agent and flotation test research. The selection of the plant requires the use of a new pharmaceutical and pharmaceutical system for flotation test research without changing the existing production process, and the evaluation and comparison with the production of the selected plant, and the industrial application based on the completion of the laboratory test. test.

After a series of laboratory tests and industrial application tests, the industrial test of MY reverse flotation collector produced by Maanshan Mine Research Institute was used . The flotation operation achieved 65.74% of iron concentrate grade, 50.18% of iron concentrate yield, and concentrate recovery. The technical indicator rate is 84.31%. Compared with the same period of production indicators, in the case of similar concentrate grades, the concentrate recovery rate can be increased by 1.07%, and the concentrate yield can be increased by 1.21%. The selected plant estimates that the cost of the drug can be reduced by 20%. The results of industrial tests show that: MY reverse flotation collector has good adaptability, stable flotation operation, high beneficiation efficiency and low cost of chemicals. It is suitable and effective in the plant selection. The test achieved its intended purpose.

Second, the nature of the ore

The iron minerals in the ore mineral composition are mainly hematite (native), followed by imaginary hematite and limonite, and sporadic distribution of magnetite and siderite. The gangue minerals are mainly quartz , followed by calcite , chlorite, mica and dolomite. Hematite is the most abundant iron mineral in ore, mostly in the form of hexagonal scales, and the mineral crystal size is small. It is assumed that hematite has a relatively regular isometric granular sporadic output. The content of magnetite is low, mainly formed by oxidative alteration of hematite. Most of them retain the embedding characteristics of the original hematite. The content of limonite is low, which is mainly found in ore with higher degree of weathering, according to the output form. It is known that the limonite in the ore is a product formed by the original hematite under oxidizing conditions. The results of multi-element analysis of ore are shown in Table 1; the iron phase analysis results in ore are shown in Table 2.

Table 1 Results of multi-element analysis of ore

Table 2 Results of iron phase analysis in ore

The analysis results of Table 1 and Table 2 indicate that the iron minerals recoverable in the ore are mainly 32.64%. The components to be discharged by ore dressing are SiO ₂ , followed by CaO and MgO. The content of harmful impurities P and S is higher. low. The iron in the ore is distributed in red (brown) iron ore, magnetite and iron carbonate, accounting for 96.17%, which is the maximum theoretical recovery of iron in ore dressing ore. Comprehensive mineral chemical composition characteristics, it can be considered that the ore is a low S, P single acidic lean hematite.

Third, laboratory flotation test

(1) Flotation test ore sample

In this test, two kinds of ore samples 1 ^# and 2 ^# were provided by the plant, which were taken from the strong magnetic concentrate in production, that is, flotation to the ore, each providing 50Kg. The sample was tested and sieved. The sample size of 1 ^# mine was 38.52%, the fineness of -0.076mm accounted for 80%; the sample of 2 ^# mine was 49.20%, and the fineness of -0.076mm accounted for 82%.

(2) Flotation agent

Flotation agent is the basis for the improvement of flotation index. The quality of the agent directly affects the selection index, production cost and economic benefit. According to the requirements of the plant selection, the flotation performance of the MY collector (A drug) and the collector for the production of the plant (B drug) was investigated. MY collector is a new type of anti-flotation collector. The drug has good selectivity and strong harvesting ability. MY series of different kinds of pesticides have been applied to various mines. In this test, in order to adapt to the flotation of the mineral, the production process and ratio of the MY series collector were adjusted.

(III) Laboratory anti-flotation open circuit test

According to the production situation of the plant, the 1 ^# ore sample is more difficult to select, and the 2 ^# ore sample is better selected. In the ore dressing test, the reverse flotation test of the 1 ^# ore sample is carried out. The reverse flotation open circuit test is carried out according to the production process of the plant. The reverse flotation process is a rough selection, one selection, and two sweeps. After a large number of conditional tests, the flotation reagent system was finalized and the laboratory reverse flotation open circuit test was completed. The A and B drugs were subjected to a flotation test under the same process conditions. The reverse flotation process conditions are: slurry concentration is 32%, flotation temperature is 30 °C, and pulp pH is 10.5. The anti-flotation open circuit test process is shown in Figure 1; the reverse flotation drug system is shown in Table 3; and the reverse flotation open circuit test results are shown in Table 4.

Figure 1 Reverse flotation open circuit test process

Table 3 Reverse flotation reagent system

Table 4 Anti-flotation open circuit test indicators

The test results in Table 4 show that both the sample ^# 2 or ^# 1, A medicament will obtain better sorting index; B index with Comparative drug testing, in the case of similar grade concentrate, ore concentrates recovered ^# 1 The rate can be increased by 0.9%; the recovery rate of 2 ^# ore concentrate can be increased by 0.94%. A drug has good selectivity and harvesting ability, and it is highly adaptable to the mine. It is an ideal collector for the ore flotation.

(IV) Laboratory reverse flotation closed circuit test

In order to investigate the impact of the return of the mine on the flotation index, the anti-flotation closed-circuit test was carried out on the 1 ^# ore sample, and the experiment adopted the flotation process. The reverse flotation test adopts one rough selection, one selection, two sweeps, and the selective flotation process flow returned by the middle mine. The process conditions and the pharmaceutical system are the same as the small test. Reverse flotation see two closed-circuit test; ^# 1 reverse flotation ore closed test results in Table 5.

Table 5 1 ^#矿样反浮浮闭测试试验

The test results in Table 5 show that the return of the middle mine has no effect on the flotation index, and the ore dressing index is good, which further proves that the A drug can be used in the next industrial application test. Compared with the B drug test index, the concentrate recovery rate can be increased by 1.1% in the case of similar concentrate grades.

Figure 2 Reverse flotation closed circuit test procedure

Fourth, industrial application test

(1) Industrial application test

On the basis of laboratory tests, industrial application tests shall be carried out at the request of the plant. In the industrial application test, the MY collector is tested for one week without changing the production process, and the test indicators are included in the normal production index assessment. In order to better reflect the performance of the MY collector, the two parties negotiated the normal production index for the week before the test, and compared the A and B drug flotation indicators. During the two-week test period, the whole process of sampling and analysis of the flotation ore, flotation concentrate and flotation tailings was carried out (two hours). The industrial test drug system is basically the same as the small test, except that the amount of collector is slightly reduced. The dressing process of the plant selection is shown in Figure 3; the average index of industrial application test is shown in Table 6.

Figure 3 Selecting plant beneficiation process

Table 6 Average index of industrial application test

Table 6 shows the average index of industrial application test results: A drug has good selectivity and harvesting ability, and can be used as a flotation collector for the mineral. Compared with the B drug, it has certain advantages. When the concentrate grade is similar, the concentrate yield can be increased by 1.21%, the recovery rate is increased by 1.07%, and the tailings grade is reduced by 0.39%.

(II) Technical and economic indicators

After two weeks of industrial testing, a rough estimate of the technical and economic indicators of the test was made.

At present, the annual processing of raw ore is 500,000 tons, and about 40% of the tailings are removed by magnetic separation. The amount of flotation operation is about 300,000 tons. According to the test index, the yield of A drug concentrate is 1.21% higher than that of B drug. The annual output of concentrates is 300,000 tons × 1.21% = 36.63 million tons. According to the refined product grade of 65% per ton, the price is 800 yuan, which can produce 0.363 × 800 = 2.904 million yuan per year. According to the plant selection, the cost of the drug can be reduced by about 20%. It can save about 100,000 yuan in pharmacy costs a year. The economic benefits of using MY collectors are significant.

V. Conclusion

(1) Laboratory test and industrial application test results show that: MY collector has good selectivity and strong harvesting power, and is an effective anti-flotation collector for selecting poor hematite.

(2) The industrial application test of MY collector obtained a good selection index of 65.74% concentrate grade and 84.31% recovery rate.

(3) Comparing the production of pharmaceuticals by the factory, on the basis of no increase in any cost, in the case of similar concentrate grades, the yield of concentrates can be improved, and good economic benefits can be obtained for enterprises. The MY collector is a more effective flotation collector for the poor hematite.

Reference material

1. Organic Chemistry Xu Shouchang People's Education Press 1981.11

2. Principles of Flotation of Chemicals Wang Dianzuo Central South University of Technology 1986.07

3. Research Report on High-efficiency Iron Ore Collector Wang Kuan Yan Hengyang Maanshan Mine Research Institute 1999.01

4. The MZ-21 of the Qi Dashan Concentrator selected the workshop to replace the RA-315 industrial test report.

Qi Dashan Concentrator Maanshan Mine Research Institute Mining Industry Company Qizhan Comprehensive Industrial Company 2001.09

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