Method for separating and recycling high-argillization molybdenite

Abstract

The invention belongs to the technical field of copper sulfide ore processing, and particularly relates to a technological method for separating and recycling molybdenite in high-argillization copper-molybdenum bulk concentrate. In order to solve the problems that chalcopyrite and molybdenite in the copper-molybdenum bulk concentrate are similar in floatability, the bulk concentrate is highly argillized (-600 meshes are larger than 60%), the use amount of inhibitor sodium sulfide is large, a large amount of COD standard-exceeding wastewater is generated and the like, pre-grading desliming is adopted to reduce the silt content, an efficient decomposer is adopted to strongly stir to remove an original attached agent, and a novel combined inhibitor is selected to inhibit chalcopyrite through roughing; according to the process method, the surface area of particles is increased by rubbing an elution reagent on rough concentrate, the grade of molybdenite is improved through continuous concentration, the effect is good, and the separation and recovery problems of high-argillization chalcopyrite and molybdenite are well solved. After the molybdenum concentrate is treated by the method, the grade of the final molybdenum concentrate can reach 45%, and the molybdenum recovery rate reaches 65% or above. The method has the characteristics of simple process, good index, easiness in industrial implementation and the like.

Description

Technical Field

[0001] The invention relates to a separation and recovery process for highly muddy molybdenite, in particular to the efficient separation and utilization of molybdenum-containing copper concentrate, and belongs to the field of mineral flotation technology in mineral processing engineering. Background Art

[0002] Copper is an important nonferrous metal resource and one of the scarce minerals. my country is a major copper consumer, and most of the copper is refined and enriched from copper sulfide ores. my country's copper resources have the characteristics of more poor ores and fewer rich ores; more co-existing deposits and fewer single deposits; more small and medium-sized mines and fewer large mines; more difficult ores and fewer easy ores. my country's copper production is high, but consumption is even higher, and its dependence on foreign countries is high.

[0003] Molybdenum is also an important industrial material. my country has a large proven reserve of molybdenum, but few high-grade deposits and many low-grade deposits. One of the main sources of molybdenum metal is copper sulfide molybdenum ore, which mainly exists in porphyry copper deposits and skarn copper deposits.

[0004] Copper and molybdenum are often co-existing in sulfide ores. Because chalcopyrite and molybdenite are hydrophobic, have similar floatability, and have low grades in copper-molybdenum sulfide ores, the process of mixed copper-molybdenum flotation and copper-molybdenum separation is often used. The difficulty of flotation separation of the two has always been a hot topic and difficulty in mineral processing research, especially the separation of copper and molybdenum in highly muddy copper-molybdenum mixed concentrates. With the increasing requirements for green development and economic benefits of mines, the research and development of green and environmentally friendly production processes and reagents has also become a necessary path for the development of mining enterprises. Therefore, achieving efficient copper-molybdenum separation is of great significance to the efficient utilization of my country's copper-molybdenum resources. Summary of the invention

[0005] The invention provides a process for separating and recovering highly muddy molybdenite, which is mainly aimed at solving the separation and recovery of highly muddy molybdenite and chalcopyrite and efficiently recovering fine-grained molybdenite.

[0006] The method is suitable for separation and recovery of highly muddy molybdenite, with simple process and good effect.

[0007] A method for separating and recovering highly muddy molybdenite, the method comprising the following process steps:

[0008] (1) The high-sludge copper-molybdenum mixed concentrate is prepared into a slurry with a concentration of 20% to 50%, and then stirred at a low speed with a stirrer. After stirring evenly, the stirring is stopped and settled for 2 minutes to 3 minutes. The fine mud with a yield of about 8% to 15% is removed by a pre-classification method.

[0009] (2) The copper-molybdenum mixed concentrate remaining after desludging is re-prepared into a slurry with a concentration of 20% to 50%, and a new combination decomposition agent of sodium sulfide + sodium carbonate + sodium hexametaphosphate is added, and the mixture is stirred and scrubbed. After stirring and scrubbing, the mixture is concentrated, settled and dehydrated to efficiently remove the residual agent.

[0010] (3) After the removal of the drug, the copper-molybdenum mixed concentrate uses a newly developed combined inhibitor to suppress copper minerals, and emulsified kerosene is used as a collector to float molybdenite. The molybdenum rough concentrate is obtained by a flotation process of one roughing and one scavenging.

[0011] (4) The obtained molybdenum crude concentrate is concentrated and then put into a stirred mill for further grinding and scrubbing. After scrubbing and removing the attached reagents, the final molybdenum concentrate is obtained after 3 to 6 consecutive concentrations.

[0012] Furthermore, the particle size of the (1) highly muddy copper-molybdenum mixed concentrate is -600 mesh>60%, the Cu grade in the copper-molybdenum mixed concentrate is 17% to 25%, and the Mo grade is 0.3% to 0.7%.

[0013] Furthermore, the medium-low speed stirring intensity in (1) is 200 r / min to 800 r / min, and the stirring time is 3 min to 5 min.

[0014] Furthermore, the drug removal method in (2) is to add a new combination drug decomposing agent, the ratio of which is: sodium sulfide: sodium carbonate: sodium hexametaphosphate = 25:1:1, the dosage is 5-15 kg / t, the strong stirring intensity is 1000r / min-2000r / min, and the stirring time is 5min-10min.

[0015] Furthermore, the combined inhibitor in (3) is sodium sulfide + ammonium thioglycolate + sodium alginate, the addition ratio is 1-10:1-50:1-10, and the dosage range is 1kg / t-10kg / t, 5kg / t-30kg / t and 5g / t-50g / t.

[0016] Furthermore, the coarse concentrate in (4) is concentrated and then put into a stirred mill for regrinding and scrubbing, the regrinding concentration is 20% to 45%, and the regrinding and scrubbing time is 1 min to 4 min (-600 mesh accounts for 75% to 90%).

[0017] Furthermore, after the grinding and washing in (4), the final molybdenum concentrate is obtained by continuous concentration for 3 to 6 times.

[0018] The method has the following beneficial effects: the method aims at the problem of difficulty in recovering highly muddy molybdenite, reduces the mud content by pre-grading and desliming, removes the original attached reagents by strong stirring with a high-efficiency decomposing agent, inhibits chalcopyrite by roughing, and removes the reagents by grinding and washing the coarse concentrate to increase the particle surface area, and continuously selects and improves the grade of molybdenite, which effectively solves the problem of separation and recovery of highly muddy chalcopyrite and molybdenite, and finally the grade of molybdenum concentrate can reach 45%, and the molybdenum recovery rate can reach more than 65%. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a flow chart showing the principle of the flotation process of the highly muddy copper-molybdenum mixed concentrate. DETAILED DESCRIPTION

[0020] The following non-limiting embodiments may enable a person skilled in the art to more fully understand the present invention, but are not intended to limit the present invention in any way.

[0021] The test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0022] Example 1

[0023] The method of the present invention is adopted to practice the flotation process of highly muddy copper-molybdenum mixed concentrate in a certain sulfide copper ore concentrator.

[0024] In a copper-molybdenum mixed concentrate, -600 mesh accounts for 79.48%, Cu grade is 20.55%, Mo grade is 0.43%, and pulp concentration is 60%. First, weigh 1950g of pulp, put it into a 3L beaker, and add water to the pulp volume of 3L. Then put it into the agitator and stir it at a low speed of 500r / min for 5min. Then stop stirring and wait for the pulp to settle for 2min30s, use a rubber tube to extract the upper pulp, pump it to the pulp volume of 2L, and then add water to 3L. The extracted fine mud is filtered and dried, then weighed and tested. Add 5kg / t of sodium sulfide, 200g / t of sodium carbonate and 200g / t of sodium hexametaphosphate to the pulp. Add a new decomposition agent composed of 5kg / t sodium sulfide, 200g / t sodium carbonate and 200g / t sodium hexametaphosphate to the pulp, stir it at a speed of 1500r / min for 5min, then stop stirring, extract the supernatant to remove the drug after complete sedimentation, and conduct flotation test on the remaining pulp.

[0025] The flotation test reagent system is as follows: 5kg / t sodium sulfide for roughing, 20kg / t ammonium thioglycolate, 20g / t sodium alginate, 10g / t kerosene; 5kg / t sodium sulfide for scavenging, 3kg / t ammonium thioglycolate, 5g / t sodium alginate, 5g / t kerosene; 5kg / t sodium sulfide for concentrating I; 3kg / t sodium sulfide for concentrating II, 2g / t kerosene; 2kg / t sodium sulfide for concentrating III, IV, and V; 1kg / t sodium sulfide for concentrating VI. The fineness of the coarse concentrate after grinding and washing is -600 mesh, accounting for 83.35%.

[0026] After the deslimed and de-doped pulp is treated with the above-mentioned reagent system and the process method of the present invention, the flotation indicators of molybdenum concentrate grade of 45.29% and molybdenum recovery rate of 65.44% are finally obtained, while the sludge yield is 8.75% and the molybdenum loss rate is 13.49%, with good effect.

[0027] Example 2

[0028] The method of the present invention is adopted to practice the flotation process of highly muddy copper-molybdenum mixed concentrate in a certain sulfide copper ore concentrator.

[0029] In a copper-molybdenum mixed concentrate, -600 mesh accounts for 79.22%, Cu grade is 20.18%, Mo grade is 0.49%, and pulp concentration is 60%. First, weigh 1950g of pulp, put it into a 3L beaker, and add water to the pulp volume of 3L. Then put it into the agitator and stir it at a speed of 800r / min for 5min. Then stop stirring and wait for the pulp to settle for 2min30s, use a rubber tube to extract the upper pulp, pump it to the pulp volume of 2L, and then add water to 3L. The extracted fine mud is filtered and dried, and then weighed and tested. Add 10kg / t of sodium sulfide, 400g / t of sodium carbonate and 400g / t of sodium hexametaphosphate to the pulp. Add a new decomposition agent composed of 10kg / t sodium sulfide, 400g / t sodium carbonate and 400g / t sodium hexametaphosphate to the pulp, stir it at a speed of 2000r / min for 5min, then stop stirring, extract the supernatant to remove the drug after complete sedimentation, and conduct flotation test on the remaining pulp.

[0030] The flotation test reagent system is 6kg / t sodium sulfide for roughing, 30kg / t ammonium thioglycolate, 30g / t sodium alginate, and 10g / t kerosene for scavenging; 5kg / t sodium sulfide, 3kg / t ammonium thioglycolate, 5g / t sodium alginate, and 5g / t kerosene for scavenging; 5kg / t sodium sulfide for concentrating I; 3kg / t sodium sulfide for concentrating II, and 2g / t kerosene; 2kg / t sodium sulfide for concentrating III, IV, and V; and 1kg / t sodium sulfide for concentrating VI. The fineness of the coarse concentrate after grinding and washing is -600 mesh, accounting for 83.65%.

[0031] After the deslimed and de-doped pulp is treated with the above-mentioned reagent system and the process method of the present invention, the flotation indicators of molybdenum concentrate grade of 45.50% and molybdenum recovery rate of 65.14% are finally obtained, while the sludge yield is 9.05% and the molybdenum loss rate is 10.11%, with good effect.

[0032] Example 3

[0033] In a copper-molybdenum mixed concentrate of a certain concentrator, -600 mesh accounts for 69.55%, +325 mesh yield is 8.85%, molybdenum distribution rate is about 5%, Cu grade is 19.43%, Mo grade is 0.66%, and pulp concentration is 60%. First, weigh 1850g of pulp and sieve out +325 mesh coarse sand with a 325 mesh sieve. Then put the sieved part into a 3L beaker and add water to the pulp volume of 3L. Add 10kg / t of sodium sulfide, 400g / t of sodium carbonate and 400g / t of sodium hexametaphosphate to the pulp. Stir at a speed of 2000r / min for 5 minutes and then stop stirring. After complete sedimentation, extract the supernatant to remove the drug, and conduct flotation test on the remaining pulp.

[0034] The reagent system for flotation test is 6kg / t sodium sulfide for roughing, 30kg / t ammonium thioglycolate, 320g / t alginate, and 10g / t kerosene for scavenging; 5kg / t sodium sulfide, 3kg / t ammonium thioglycolate, 5g / t sodium alginate, and 5g / t kerosene for scavenging; 5kg / t sodium sulfide for concentrating I; 3kg / t sodium sulfide for concentrating II, and 2g / t kerosene; 2kg / t sodium sulfide for concentrating III, IV, and V; and 1kg / t sodium sulfide for concentrating VI. The fineness of the coarse concentrate after grinding and washing is -600 mesh, accounting for 75.35%.

[0035] After the pulp after de-coarsening and de-doping was treated with the above-mentioned reagent system and process method, the final flotation index of molybdenum concentrate grade was 45.63% and the recovery rate was 66.45%, with good effect.

[0036] Example 4

[0037] In a copper-molybdenum mixed concentrate, -600 mesh accounts for 81.21%, Cu grade is 19.11%, Mo grade is 0.56%, and pulp concentration is 60%. First, weigh 1950g of pulp, put it into a 3L beaker, and add water to the pulp volume of 3L. Then put it into the agitator and stir it at a speed of 800r / min for 5min. Then stop stirring and wait for the pulp to settle for 2min30s, use a rubber tube to extract the upper pulp, pump it to the pulp volume of 2L, and then add water to 3L. The extracted fine mud is filtered, dried, and weighed for testing. The remaining pulp is stirred at a speed of 2000r / min for 5min and then stopped stirring. After complete sedimentation, the supernatant is extracted to remove the drug, and the remaining pulp is subjected to flotation test.

[0038] The flotation test reagent system is 6kg / t sodium sulfide for roughing, 30kg / t ammonium thioglycolate, 30g / t sodium alginate, and 10g / t kerosene for scavenging; 5kg / t sodium sulfide, 3kg / t ammonium thioglycolate, 5g / t sodium alginate, and 5g / t kerosene for scavenging; 5kg / t sodium sulfide for concentrating I; 3kg / t sodium sulfide for concentrating II, and 2g / t kerosene; 2kg / t sodium sulfide for concentrating III, IV, and V; and 1kg / t sodium sulfide for concentrating VI. The fineness of the coarse concentrate after grinding and washing is -600 mesh, accounting for 85.45%.

[0039] After the un-de-slimed and un-de-doped slurry was treated with the above-mentioned reagent system and process method, the final flotation index of molybdenum concentrate grade was 43.11% and the recovery rate was 69.28%, and the effect was average.

[0040] In summary, after comparison, the technical solution of the present invention can better separate chalcopyrite and molybdenite in fine-grained copper-molybdenum mixed concentrate, and the process is simple and easy to operate.

[0041] For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for separating and recovering highly muddy molybdenite, characterized in that: The method comprises the following steps: S1) preparing a slurry with a concentration of 20% to 50% from a high-sludge copper-molybdenum mixed concentrate, stirring it at a low speed with a stirrer, stopping stirring after stirring evenly, settling for 2 minutes to 3 minutes, and removing fine mud with a yield of about 8% to 15% by a pre-classification method; S2) preparing the remaining copper-molybdenum mixed concentrate after desludging into a slurry with a concentration of 20% to 50%, adding a new combination decomposition agent of sodium sulfide + sodium carbonate + sodium hexametaphosphate, stirring and scrubbing, and then concentrating, settling and dehydrating to efficiently remove the residual agent; S3) The copper-molybdenum mixed concentrate after drug removal uses a combined inhibitor to suppress copper minerals, emulsified kerosene is used as a collector to float molybdenite, and a flotation process of one roughing and one scavenging is used to obtain a rough molybdenum concentrate; The molybdenum concentrate obtained in step S4) is concentrated and then put into a stirred mill for further grinding and scrubbing. After scrubbing and removing the attached reagents, the final molybdenum concentrate is obtained after 3 to 6 consecutive concentrations.

2. The method according to claim 1, characterized in that The particle size of the highly muddy copper-molybdenum mixed concentrate in S1) is -600 mesh>60%, the Cu grade in the copper-molybdenum mixed concentrate is 17%-25%, the Mo grade is 0.3%-0.7%, the low-speed stirring intensity is 200r / min-800r / min, and the stirring time is 3min-5min.

3. The method according to claim 1, characterized in that The drug removal method in S2) is to add a new combination drug decomposing agent, the ratio of which is: sodium sulfide: sodium carbonate: sodium hexametaphosphate = 25:1:1, the dosage is 5-15kg / t, the strong stirring intensity is 1000r / min-2000r / min, and the stirring time is 5min-10min.

4. The method according to claim 1, characterized in that: The combined inhibitor in S3) is sodium sulfide + ammonium thioglycolate + sodium alginate, the addition ratio is 1-10:1-50:1-10, and the dosage range is 1kg / t-10kg / t, 5kg / t-30kg / t and 5g / t-50g / t.

5. The method according to claim 1, characterized in that: The coarse concentrate in S4) is concentrated and then put into a stirred mill for re-grinding and scrubbing, the re-grinding concentration is 20% to 45%, and after re-grinding and scrubbing for 1min to 4min (-600 mesh accounts for 75% to 90%), it is continuously refined for 3 to 6 times to obtain the final molybdenum concentrate.

6. A process for separating and recovering molybdenite from a highly muddy copper-molybdenum mixed concentrate as described in any one of claims 1 to 5.

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