Application of triethanolamine in simultaneously improving grinding efficiency and flotation index of low-grade molybdenum ore

Abstract

The invention discloses application of triethanolamine in simultaneously improving the grinding efficiency and the flotation index of low-grade molybdenum ore, triethanolamine is used as a grinding aid to grind the low-grade molybdenum ore, and then the ground product is subjected to flotation. According to the method, triethanolamine is adopted as a grinding aid, the grinding efficiency of the low-grade molybdenum ore can be improved, and the flotation index can be better improved.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding and flotation, and particularly relates to the application of triethanolamine in simultaneously improving the grinding efficiency and flotation index of low-grade molybdenum ore. Background Art

[0002] As a trace element, molybdenum accounts for only 0.001% of the total weight of the earth's crust, but its excellent properties such as high hardness, high melting point, and corrosion resistance make it play an important and irreplaceable role in the fields of steel, chemical industry, electronics, and medicine. In 2019, the Ministry of Natural Resources of my country issued the "Opinions of the Ministry of Natural Resources on Promoting the Reform of Mineral Resources Management" which listed molybdenum as one of the fourteen important strategic minerals and included it in the management scope of the Ministry of Natural Resources. The new round of strategic actions for mineral exploration breakthroughs also included molybdenum in the thirty-five strategic mineral resources, and countries such as the United Kingdom, Canada, and Brazil have even included molybdenum in the list of key minerals.

[0003] According to the statistics of the United States Geological Survey (USGS) in 2022, the total reserves of molybdenum resources in the world are 12 million tons, of which China's molybdenum reserves are 3.7 million tons, accounting for 30.8% of the world's total reserves, ranking first in the world. According to statistics from the International Molybdenum Association (IMOA), the global molybdenum consumption in 2022 was 286,000 tons, of which China consumed 122,000 tons, accounting for 42.7%, followed by European countries (19.6%), the United States (9.8%) and Japan (8.0%). As my country's industrialization continues to deepen, its demand will continue to grow.

[0004] my country's molybdenum deposits mainly include four types: porphyry, skarn, hydrothermal vein and sedimentary. Among them, molybdenite, a sulfide mineral of molybdenum, is the most common, and it is also the mineral with the most industrial mining value. Molybdenite has good natural floatability and can be recovered by flotation with a simple collector. Therefore, flotation is the main method of molybdenum separation at present. Flotation has certain particle size requirements for floating minerals, and crushing and grinding generally account for 40% to 50% of the production cost of molybdenum beneficiation plants. In this regard, many scholars have conducted research on grinding in the hope of reducing the production cost of enterprises by improving grinding efficiency. Adding grinding aids is one of the main methods to improve grinding efficiency. Its mechanism of action is to affect the properties of minerals and slurry during grinding through appropriate amounts of grinding aids, making mineral particles easier to crush, thereby improving grinding efficiency. There are many types of grinding aids, which are mainly divided into two categories: inorganic and organic. Inorganic grinding aids mainly include sodium hexametaphosphate, sodium tripolyphosphate, etc.; organic grinding aids are mainly alcohols, amines, alcohol amines, fatty acids and their salts. In the prior art, when selecting grinding aids, the influence on the grinding process is mostly considered, but the influence of grinding aids on subsequent flotation is less studied. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide an application of triethanolamine in simultaneously improving the grinding efficiency and flotation index of low-grade molybdenum ore. Using triethanolamine as a grinding aid can not only improve the grinding efficiency of low-grade molybdenum ore, but also better improve the flotation index.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] The application of triethanolamine in improving the grinding efficiency and flotation index of low-grade molybdenum ore at the same time, using triethanolamine as a grinding aid, grinding the low-grade molybdenum ore, and then flotation of the ground product.

[0008] Preferably, the molybdenum grade in the low-grade molybdenum ore is 0.08-0.12%.

[0009] Preferably, the dosage of triethanolamine is 90-105 g / t low-grade molybdenum ore.

[0010] Preferably, the flotation adopts two roughing selections and two scavenging selections, the flotation collector adopts kerosene, and the flotation frother adopts 2# oil.

[0011] In the present invention, the product of low-grade molybdenum ore after grinding is subjected to flotation, and the flotation adopts two roughing selections and two scavenging selections. The flotation collector adopts kerosene, and the flotation frother adopts 2# oil. All of them are the current conventional flotation processes and conditions of molybdenum, which will not be described in detail here.

[0012] Beneficial effects of the present invention:

[0013] In the present invention, triethanolamine is used as a grinding aid for grinding low-grade molybdenum ore, which can better improve the grinding efficiency of the low-grade molybdenum ore and better improve the subsequent flotation index. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the flotation process flow chart under different grinding aids. DETAILED DESCRIPTION

[0015] The present invention is further described below with reference to specific examples, but the scope of protection of the present invention will not be limited.

[0016] Example 1

[0017] The low-grade molybdenum ore used in this example comes from Yichun Luming Mining Co., Ltd., and the molybdenum grade in the ore is 0.1%.

[0018] 1. Soak the low-grade molybdenum ore in clean water and three grinding aids of different concentrations of triethanolamine, sodium hexametaphosphate and water glass for 30 minutes, then take it out and dry it for compression test. The results are shown in Table 1.

[0019] As shown in Table 1, compared with water, the compressive strength of the ore immersed in 50g / t and 100g / t triethanolamine decreased by 1.01MPa and 6.54MPa respectively; the compressive strength of the ore immersed in 250g / t and 500g / t sodium hexametaphosphate decreased and increased by 3.66MPa and 1.4MPa respectively; the compressive strength of the ore immersed in 250g / t and 500g / t water glass decreased by 5.99MPa and 6.98MPa respectively, which is not much different. Therefore, considering the cost of reagents, the concentrations of triethanolamine, sodium hexametaphosphate and water glass are selected to be 100g / t, 250g / t and 250g / t respectively. In addition, since the concentrations of triethanolamine and water glass have similar effects on the compressive strength of the ore, and considering that the results of their effects on subsequent grinding and flotation experiments have a high overlap, the water glass concentration is used as a benchmark, and a 1:1 compound grinding aid of triethanolamine and water glass is selected instead of single water glass for subsequent experiments.

[0020] Table 1 Compressive strength of ore under different concentrations of grinding aids

[0021]

[0022]

[0023] 2. Combined with the test results of ore compressive strength, 250 mL of three grinding aid solutions of triethanolamine, sodium hexametaphosphate and triethanolamine + water glass were prepared for subsequent grinding and flotation experiments.

[0024] 3. Weigh 500g of molybdenum ore each time and add it together with 250mL of clean water or prepared grinding aid into the same wet conical ball mill. After adding, set the grinding time to 6 minutes and 10 seconds for grinding.

[0025] 4. The grinding product obtained in step 2 was sieved using standard sieves with mesh numbers of 6, 16, 32, 100, 200 and 400, respectively, to obtain products of 7 particle sizes: +6 mesh, -6+16 mesh, -16+32 mesh, -32+100 mesh, -100+200 mesh, -200+400 mesh and -400 mesh. The quality and yield of the products in different particle size ranges obtained after filtration, drying and weighing are summarized in Table 2.

[0026] Table 2 The proportion of different particle sizes under different types of grinding aids (%)

[0027]

[0028] As shown in Table 2, compared with clean water, the yield of 200-400 mesh size under the action of triethanolamine, sodium hexametaphosphate and triethanolamine + water glass increased by 5.99%, 3.38% and 4.98% respectively, the yield of 400-600 mesh size increased and decreased by 0.12%, 0.62% and 2.99% respectively, and the yield of size below 600 mesh decreased and increased by 0.05%, 1.91% and 2.91% respectively. Under the same grinding time, the proportion of -200 mesh is triethanolamine> triethanolamine + water glass> sodium hexametaphosphate> clean water. From the above data, it can be seen that compared with the other two grinding aids, the yield of 200-400 mesh size under the action of triethanolamine, which is beneficial to flotation, is significantly improved compared with clean water, while the yield of 400-600 mesh and size below 600 mesh, which is not conducive to flotation, is less increased than that of clean water, or even decreased. Based on the above analysis results, triethanolamine has the best effect on grinding effect when used as a grinding aid.

[0029] 5. Transfer the ground product to the flotation tank and select Figure 1 The process flow and reagent system are used for flotation (the flotation adopts the process flow of two roughing and two scavenging: the flotation collector is kerosene, the amount of kerosene in roughing I is 18.40g / t, the amount of kerosene in roughing II is 36.80g / t, the amount of kerosene in scavenging I is 18.40g / t, and the amount of kerosene in scavenging II is 9.20g / t; the flotation frother is 2# oil, the amount of 2# oil in roughing I is 21.20g / t, the amount of 2# oil in roughing II is 42.40g / t, the amount of 2# oil in scavenging I is 21.20g / t, and the amount of 2# oil in scavenging II is 10.60g / t. The flotation product is filtered, dried, weighed, and then sampled and tested for grade. The quality and molybdenum grade data obtained are calculated and sorted and summarized in Table 3.

[0030] Table 3 Recovery of molybdenum under different grinding aids

[0031]

[0032] As shown in Table 3, the crude I molybdenum grade of clean water is 14.21%, the recovery rate is 54.38%, the crude II molybdenum grade is 2.27%, the recovery rate is 36.45%, and the total recovery rate is 94.57%; the crude I molybdenum grade of triethanolamine is 8.81%, the recovery rate is 70.78%, the crude II molybdenum grade is 1.04%, the recovery rate is 24.16%, and the total recovery rate is 97.13%; the crude I molybdenum grade of sodium hexametaphosphate is 8.86%, the recovery rate is 49.17%, the crude II molybdenum grade is 1.73%, the recovery rate is 42.84%, and the total recovery rate is 96.35%; the crude I molybdenum grade of triethanolamine + water glass is 6.08%, the recovery rate is 69.29%, the crude II molybdenum grade is 1.00%, the recovery rate is 25.86%, and the total recovery rate is 96.80%. After comparison, it is found that the total recovery rate is triethanolamine>triethanolamine+water glass>sodium hexametaphosphate>clean water. In addition, the molybdenum grade and recovery rate of the rapid flotation section (coarse I) under the three grinding aids were further compared. It can be found that compared with triethanolamine + water glass, the coarse I molybdenum grade in triethanolamine was significantly increased by 2.73%; and compared with sodium hexametaphosphate, the molybdenum recovery rate of the rapid flotation section (coarse I) of triethanolamine was significantly increased by 21.61%. Based on the above analysis results, triethanolamine has the best effect on the flotation effect of low-grade molybdenum ore when used as a grinding aid.

[0033] In summary, using triethanolamine as a grinding aid for low-grade molybdenum ore grinding can not only better improve the grinding efficiency of low-grade molybdenum ore, but also better improve the flotation index.

Claims

1. The application of triethanolamine in improving the grinding efficiency and flotation index of low-grade molybdenum ore is characterized by: Low-grade molybdenum ore is ground with triethanolamine as a grinding aid, and then the ground product is floated.

2. The use of triethanolamine according to claim 1 in simultaneously improving the grinding efficiency and flotation index of low-grade molybdenum ore, characterized in that: The molybdenum grade in the low-grade molybdenum ore is 0.08-0.12%.

3. The use of triethanolamine according to claim 1 in simultaneously improving the grinding efficiency and flotation index of low-grade molybdenum ore, characterized in that: The dosage of triethanolamine is 90-105g / t low-grade molybdenum ore.

4. The use of triethanolamine according to claim 1 in simultaneously improving the grinding efficiency and flotation index of low-grade molybdenum ore, characterized in that: The flotation adopts two roughing selections and two scavenging selections, the flotation collector adopts kerosene, and the flotation frother adopts 2# oil.

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