A beneficiation method for improving the grade of a magnesium-containing copper-sulfur ore concentrate

Abstract

The application discloses a beneficiation method for improving the grade of a magnesium-containing copper-sulfur ore concentrate, and belongs to the technical field of ore dressing and quality improvement. The application provides a method for improving the grade of a magnesium-containing copper-sulfur ore concentrate, which comprises the following steps: crushing and grinding the ore to 0.074 mm to 55% to 65%, adding an adjusting agent lime, a collector butyl xanthate, kerosene and a frother MIBC to obtain a copper-molybdenum-sulfur mixed concentrate; regrinding the copper-molybdenum-sulfur mixed concentrate to 0.048 mm to 75% to 82%, adding an adjusting agent lime, a magnesium-containing silicate inhibitor, a collector SG-1 and a frother MIBC to obtain a copper-molybdenum mixed concentrate; adding sodium sulfide, a collector kerosene and a frother MIBC to the copper-molybdenum mixed concentrate to obtain a high-grade copper concentrate. The application adopts mixed flotation of copper and molybdenum, regrinding of copper and molybdenum and separation of copper and sulfur, and magnesium removal and quality improvement of the copper concentrate, so that the quality of the copper concentrate is improved.

Description

Technical Field

[0001] This invention belongs to the field of chemical technology, specifically relating to a mineral processing method for improving the grade of magnesium-copper-sulfur ore concentrate. Background Technology

[0002] Copper deposits generally fall into five types: porphyry, skarn, stratiform, volcanic sedimentary, and copper-nickel sulfide. As mining depth increases, alteration typically occurs around some deposits, such as potassic alteration, sericitization, silicification, and chloritization. These diverse alteration types increase the difficulty of ore beneficiation, particularly the presence of magnesium silicate minerals like talc, serpentine, and chlorite. [2] Pyrite significantly affects the grade of copper concentrate. There are two main factors influencing the grade of copper concentrate in the flotation of high-magnesium copper-sulfur ores. First, the influence of magnesium-containing silicate minerals. Magnesium-containing silicate minerals, such as talc, serpentine, and chlorite, are difficult to suppress. Due to their strong hydrophobicity and good natural floatability, they are not easily suppressed. Magnesium-containing silicate ores are easily ground and muddy, readily forming a slime that covers the mineral surface, affecting the collector's adsorption of the minerals. Slime is also easily mechanically entrained by flotation foam, affecting the concentrate grade. Second, the influence of pyrite. Pyrite has good floatability and easily floats; however, suppressing pyrite in a high-pH pulp environment often results in sticky foam that can entrain other minerals, affecting the quality of the copper concentrate. Pyrite is affected by Cu... 2+ Activation effect, chalcopyrite affected by Fe 2+ The inhibitory effect makes copper-sulfur separation difficult. Therefore, it is essential to develop a method that can solve the above-mentioned technical problems. Summary of the Invention

[0003] The purpose of this invention is to provide a mineral processing method for improving the grade of magnesium-copper-sulfur ore concentrate.

[0004] The objective of this invention is achieved by including pretreatment, roughing, copper-molybdenum-sulfur separation, and copper concentrate grade improvement steps, specifically including:

[0005] A. Pretreatment: The raw ore is ground and the pH value is adjusted to 8.5~10 to obtain material a, with a grinding fineness of -0.074mm accounting for 55~65%;

[0006] B. Roughing: Adjust the concentration of material a to 30-40%, add collector and diesel oil and stir for 2-4 minutes, then add frother and stir for 1-3 minutes, and aerate and scrape the foam for 3-5 minutes to obtain flotation froth product mixed rough concentrate b;

[0007] C. Copper-molybdenum-sulfur separation:

[0008] 1) The mixed coarse concentrate b is ground and the pH value is adjusted to 9~10 to obtain material c. The grinding fineness is -0.048mm, accounting for 75~82%.

[0009] 2) Adjust the concentration of material c to 30-40%, add magnesium silicate inhibitor and stir for 2-4 minutes, add collector SG-1 and stir for 2-4 minutes, then add frother and stir for 1-3 minutes, aerate and scrape the foam for 2-4 minutes to obtain the flotation froth product copper-molybdenum mixed rough concentrate d;

[0010] D. Copper concentrate grade improvement: Add sodium sulfide to the copper-molybdenum mixed rough concentrate d and stir for 2-4 minutes, add diesel oil and stir for 1-3 minutes, then add frother and stir for 1-3 minutes, and aerate and scrape the foam for 3-5 minutes to obtain the foam product containing magnesium and molybdenum e and high-grade copper concentrate f.

[0011] The specific steps are as follows:

[0012] 1. Add ore and water to a rod mill at a solid-liquid ratio of 1:1. Grind the ore to a fineness of -0.074 mm to 55%~65%. Simultaneously add lime as a modifier to the mill to obtain a flotation slurry sample with a pH value in the range of 8.5~10.

[0013] 2. Place the above flotation slurry sample into the flotation machine with a flotation concentration of 30%~40%. Add the collector butyl xanthate and diesel oil and stir for 3 minutes. Add the frother MIBC and stir for 2 minutes. Aerate and scrape the froth for 4 minutes to obtain the flotation froth product, i.e., the mixed rough concentrate.

[0014] 3. Pour the mixed coarse concentrate into the mill at a liquid-to-solid ratio of 1:1. The grinding fineness is 0.048 mm (75%~82%). Simultaneously add lime as a modifier to the mill. The pH value of the slurry should be in the range of 9~10.

[0015] 4. Place the above flotation slurry sample into the flotation machine with a flotation concentration of 30%~40%. Add magnesium silicate inhibitor and stir for 3 minutes, collector SG-1 and stir for 3 minutes, frother MIBC and stir for 2 minutes, and aerate and scrape the froth for 3 minutes to obtain the flotation froth product, namely copper-molybdenum mixed rough concentrate.

[0016] 5. The main components of the above-mentioned collector SG-1 are propylene isobutyl xanthate (50%~65%), glyceryl monolaurate (10%~20%) and a mixture of isopropanol (5%~20%).

[0017] 6. The magnesium silicate inhibitors mentioned above are selected from a 1:1 combination of inorganic salts and organic inhibitors, wherein the inorganic salts are at least one of sodium sulfite, sodium hexametaphosphate, and water glass, and the organic salts are at least one of sodium carboxymethyl cellulose, starch, and dextrin.

[0018] 7. Place the above flotation slurry sample into the flotation machine with a flotation concentration of 20%~30%. Add sodium sulfide inhibitor and stir for 3 minutes. Add MIBC frother and stir for 1 minute. Aerate and scrape the foam for 3 minutes. Filter the bottom product of the flotation machine to obtain copper concentrate with improved quality. The foam product is the magnesium-molybdenum-containing product.

[0019] This invention employs mixed flotation, regrinding for copper-sulfur separation, and copper-molybdenum-talc separation. Through the synergistic effect of reagents and processes, it achieves an improvement in the grade of copper concentrate, which has reference value for processing similar ores.

[0020] The technical principles and features of this invention are as follows:

[0021] 1. Add magnesium silicate inhibitors during the copper-molybdenum-sulfur separation stage to further reduce magnesium content and mitigate the impact of high magnesium content on process stability during recycling.

[0022] 2. Adding a more selective collector during the copper-molybdenum-sulfur separation stage reduces the impact of sulfur content and some impurities, creating a more favorable production environment for copper-molybdenum-magnesium separation.

[0023] 3. Add a collector with strong collecting ability but weak selectivity in the roughing stage to recover as much recyclable metal as possible and reduce the loss of copper metal in the roughing stage; add a collector with strong selectivity in the copper-molybdenum-sulfur separation stage to further reduce the impact of impurity content. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the closed-circuit test process in Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the fully open-circuit test process in Embodiment 2 of the present invention. Detailed Implementation

[0026] The present invention will be further described below with reference to embodiments, but this is not intended to limit the present invention in any way. Any modifications or substitutions made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0027] The mineral processing method for improving the grade of magnesium-copper-sulfur ore concentrate according to the present invention includes pretreatment, roughing, copper-molybdenum-sulfur separation, and copper concentrate grade improvement steps, specifically including:

[0028] A. Pretreatment: The raw ore is ground and the pH value is adjusted to 8.5~10 to obtain material a, with a grinding fineness of -0.074mm accounting for 55~65%;

[0029] B. Roughing: Adjust the concentration of material a to 30-40%, add collector and diesel oil and stir for 2-4 minutes, then add frother and stir for 1-3 minutes, and aerate and scrape the foam for 3-5 minutes to obtain flotation froth product mixed rough concentrate b;

[0030] C. Copper-molybdenum-sulfur separation:

[0031] 1) The mixed coarse concentrate b is ground and the pH value is adjusted to 9~10 to obtain material c. The grinding fineness is -0.048mm, accounting for 75~82%.

[0032] 2) Adjust the concentration of material c to 30-40%, add magnesium silicate inhibitor and stir for 2-4 minutes, add collector SG-1 and stir for 2-4 minutes, then add frother and stir for 1-3 minutes, aerate and scrape the foam for 2-4 minutes to obtain the flotation froth product copper-molybdenum mixed rough concentrate d;

[0033] D. Copper concentrate grade improvement: Add sodium sulfide to the copper-molybdenum mixed rough concentrate d and stir for 2-4 minutes, add diesel oil and stir for 1-3 minutes, then add frother and stir for 1-3 minutes, and aerate and scrape the foam for 3-5 minutes to obtain the foam product containing magnesium and molybdenum e and high-grade copper concentrate f.

[0034] In step A, the pH value is adjusted using lime as an adjuster.

[0035] The collector mentioned in step B is butyl xanthate.

[0036] The foaming agent mentioned in step B is methyl isobutyl methanol (MIBC).

[0037] In step C, step 1), the pH value is adjusted using lime as an adjuster.

[0038] The magnesium silicate inhibitor described in step 2) is composed of inorganic and organic components.

[0039] The mass ratio of the inorganic and organic components is 1:1.

[0040] The inorganic compounds are one or more of sodium sulfite, sodium hexametaphosphate, and water glass; the organic compounds are one or more of sodium carboxymethyl cellulose, starch, and dextrin.

[0041] The collector SG-1 described in step 2) of C is composed of isobutyl xanthate propylene ester, glyceryl monolaurate and isopropanol.

[0042] The mass ratio of isobutyl xanthate propylene ester, glyceryl monolaurate and isopropanol is (50~65):(10~20):(5~20).

[0043] The foaming agent mentioned in step 2) is methyl isobutyl methanol (MIBC).

[0044] The invention will be further illustrated below with specific implementation examples:

[0045] Example 1

[0046] Roughing stage: Take 3 kg of ore (copper content 0.45%, molybdenum content 0.010%, magnesium oxide content 11.81%), add lime as a modifier to the mill, crush and grind the ore to -0.074 mm (65%), and feed the flotation slurry with a pH of 9.5; place the slurry sample into an 8L flotation cell, add butyl xanthate + diesel (40 + 20 g / t), and stir for 3 minutes; add 40 g / t of frother MIBC, stir for 2 minutes, and aerate and skim for 4 minutes to obtain the flotation froth product, i.e., the mixed rough concentrate.

[0047] Copper-molybdenum-sulfur separation stage: The concentration of the copper-molybdenum-sulfur mixed concentrate slurry sample was adjusted to 50%, lime was added as an adjuster, the pH value was controlled at 9, and the grinding fineness was -0.045mm accounting for 75%. The ground slurry sample was placed in a 1.5L flotation machine, 300g / t of magnesium silicate inhibitor was added, and the mixture was stirred for 3 minutes; SG-1 collector (20g / t) was added and stirred for 3 minutes; MIBC frother (10g / t) was added and stirred for 2 minutes, and the mixture was aerated and skimmed for 4 minutes. The froth product was then selected to obtain the copper-molybdenum mixed concentrate.

[0048] Copper concentrate grade enhancement stage: Copper-molybdenum mixed rough concentrate slurry sample is placed into a 0.75L tank, 500g / t of sodium sulfide is added and stirred for 3 minutes; 20g / t of diesel oil is added and stirred for 2 minutes; 20g / t of frother MIBC is added and stirred for 2 minutes; aeration and frothing are carried out for 4 minutes, and the slurry sample in the flotation machine is scavenged once to obtain high-grade copper concentrate.

[0049] Closed-circuit test results as follows Figure 1 As shown, after multiple cycles, two sets of data were taken after reaching the equilibrium value (see Table 1 and Table 2) to analyze the effect of improving the quality of copper-molybdenum mixed concentrate. Under the condition that the copper recovery rate did not change much, the copper grade increased by 5-6 percentage points.

[0050] Table 1

[0051]

[0052] Table 2

[0053]

[0054] Example 2

[0055] Roughing stage: Take 3 kg of ore (copper content 0.46%, molybdenum content 0.010%, magnesium oxide content 11.81%), add lime as a modifier to the mill, crush and grind the ore to -0.074 mm (65%), and the pH of the flotation feed slurry is 8.5; put the slurry sample into an 8L flotation cell, add butyl xanthate + diesel (30 + 15 g / t), stir for 3 minutes; add 40 g / t of frother MIBC, stir for 2 minutes, aerate and skim for 4 minutes to obtain the flotation froth product, i.e., mixed rough concentrate.

[0056] Copper-molybdenum-sulfur separation stage: The concentration of the copper-molybdenum-sulfur mixed concentrate slurry sample was adjusted to 50%, lime was added as an adjuster, the pH value was controlled at 9, and the grinding fineness was -0.045mm, accounting for 81%. The ground slurry sample was placed in a 1.5L flotation machine, 200g / t of magnesium silicate inhibitor was added, and the mixture was stirred for 3 minutes; SG-1 collector (10g / t) was added and stirred for 3 minutes; MIBC frother (10g / t) was added and stirred for 2 minutes, and the mixture was aerated and skimmed for 4 minutes. The froth product was then selected to obtain the copper-molybdenum mixed concentrate.

[0057] Copper concentrate grade enhancement stage: Copper-molybdenum mixed rough concentrate slurry sample is placed into a 0.75L tank, 500g / t of sodium sulfide is added and stirred for 3 minutes; 20g / t of diesel oil is added and stirred for 2 minutes; 20g / t of frother MIBC is added and stirred for 2 minutes; aeration and frothing are carried out for 4 minutes, and the slurry sample in the flotation machine is scavenged once to obtain high-grade copper concentrate.

[0058] The open-circuit test yielded the following results: Figure 2 Results shown: Analysis of the effect of copper-molybdenum mixed concentrate on improving quality shows that the copper grade increased by 5-6 percentage points while the copper recovery rate remained relatively unchanged; detailed data are shown in Table 3.

[0059] Table 3

[0060] .

Claims

1. A beneficiation method for improving the grade of a copper sulphide concentrate containing magnesium, characterized in that, It includes pretreatment, roughing, copper-molybdenum-sulfur separation, and copper concentrate grade improvement steps, specifically including: A. Pretreatment: The raw ore is ground and the pH value is adjusted to 8.5~10 to obtain material a, with a grinding fineness of -0.074mm accounting for 55~65%; B. Roughing: Adjust the concentration of material a to 30-40%, add collector and diesel oil and stir for 2-4 minutes, then add frother and stir for 1-3 minutes, and aerate and scrape the foam for 3-5 minutes to obtain flotation froth product mixed rough concentrate b; C. Copper-molybdenum-sulfur separation: 1) The mixed coarse concentrate b is ground and the pH value is adjusted to 9~10 to obtain material c. The grinding fineness is -0.048mm, accounting for 75~82%. 2) Adjust the concentration of material c to 30-40%, add magnesium silicate inhibitor and stir for 2-4 minutes, add collector SG-1 and stir for 2-4 minutes, then add frother and stir for 1-3 minutes, aerate and scrape the foam for 2-4 minutes to obtain the flotation froth product copper-molybdenum mixed rough concentrate d; D. Copper concentrate grade improvement: Add sodium sulfide to the copper-molybdenum mixed rough concentrate d and stir for 2-4 minutes, add diesel oil and stir for 1-3 minutes, then add frother and stir for 1-3 minutes, and aerate and scrape the foam for 3-5 minutes to obtain the foam product containing magnesium and molybdenum e and high-grade copper concentrate f. The magnesium silicate inhibitor mentioned in step 2) is composed of inorganic and organic components; The mass ratio of the inorganic and organic compounds is 1:

1. The inorganic compounds are one or more of sodium sulfite, sodium hexametaphosphate, and water glass; the organic compounds are one or more of sodium carboxymethyl cellulose, starch, and dextrin. The collector SG-1 described in step C2) is composed of isobutyl xanthate propylene ester, glyceryl monolaurate and isopropanol; The mass ratio of isobutyl xanthate propylene ester, glyceryl monolaurate and isopropanol is (50~65):(10~20):(5~20).

2. The mineral processing method for upgrading the grade of a copper sulphide concentrate containing magnesium according to claim 1, characterized in that, In step A, the pH value is adjusted using lime as an adjuster.

3. The mineral processing method for upgrading the grade of a concentrate of a copper sulphide ore containing magnesium as claimed in claim 1, characterized in that, The collector mentioned in step B is butyl xanthate.

4. The mineral processing method for upgrading the grade of a copper sulphide concentrate containing magnesium according to claim 1, characterized in that, The foaming agent mentioned in step B is methyl isobutyl methanol (MIBC).

5. The mineral processing method for upgrading the grade of a copper sulphide concentrate containing magnesium according to claim 1, characterized in that, In step C, step 1), the pH value is adjusted using lime as an adjuster.

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