A method for recovering limestone type zinc oxide ore based on machine column combined flotation

Abstract

The present application relates to a kind of limestone type zinc oxide ore recovery method based on machine column combined flotation, belong to mineral processing technical field.For limestone type zinc oxide ore using traditional process, there are large reagent consumption, low flotation efficiency, long process flow, poor separation effect and other problems, the present application is based on the linkage of flotation equipment and flotation reagent, by new reagent to the selective hydrophobicity of zinc oxide mineral in ore, using flotation column to carry out two roughing, without cleaning can be fully recycled, then using flotation machine to the zinc rough concentrate is once cleaned and can obtain high-quality zinc oxide concentrate.The compound modifier developed in the present application can effectively control the pulp environment and particle surface properties, the compound collector can enhance the hydrophobicity difference of zinc oxide mineral and gangue particles, so that zinc mineral is in long-term stable contact with bubble in flotation column, the obtained rough concentrate is used to quickly output zinc concentrate using flotation machine, so as to realize short process high-efficiency recovery of limestone type zinc oxide ore.

Description

Technical Field

[0001] This invention relates to a method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and machine, belonging to the field of mineral processing technology. Background Technology

[0002] Limestone-type zinc oxide ore is a zinc oxide ore with carbonate rocks as the main host rocks. The ore bodies are mostly hosted in fractured zones or tectonic fissure zones between limestone layers. The ore structure is complex and often contains large amounts of clay and soluble salt minerals, making separation difficult. Sulfide flotation is the main method for processing this type of ore. Sodium sulfide is added to the pulp for conditioning, and after sulfidation, xanthate collectors or amine collectors are used for flotation. Sulfide amine flotation is easily affected by slime and soluble salts in the pulp. Therefore, using efficient and reasonable reagents to selectively control the mineral surface and pulp environment is the key to the flotation separation of limestone-type zinc oxide ore. However, current zinc oxide flotation reagents often have poor selectivity, weak collecting capacity, and high reagent consumption, resulting in low flotation efficiency, long process flow, and poor separation effect.

[0003] The flotation machine is a key piece of equipment in the flotation process. Through mechanical agitation, it creates turbulent flow in the slurry, suspending mineral particles and ensuring thorough mixing with reagents. Simultaneously, air is drawn in during agitation, generating appropriately sized, abundant, and stable bubbles that selectively adhere to the mineral particles, forming mineralized bubbles that achieve mineral enrichment and separation. In limestone-type zinc oxide deposits, the zinc minerals are unevenly distributed, containing not only coarse-grained zinc oxide minerals but also a large amount of fine-grained zinc oxide minerals. While the high-speed rotation of the flotation machine impeller generates a strong turbulent environment that can suspend coarse-grained zinc oxide minerals, the weak bubble-mineral bond causes these minerals to easily detach. Furthermore, the contact time between fine-grained zinc oxide minerals and bubbles in the flotation machine is short, resulting in a low adhesion opportunity and poor separation efficiency for these minerals. Summary of the Invention

[0004] To address the problems of high reagent consumption, low flotation efficiency, long process flow, and poor separation effect in traditional processes for limestone-type zinc oxide ore, this invention proposes a recovery method for limestone-type zinc oxide ore based on combined flotation column and flotation machine. After selectively dehydrogenating the zinc oxide minerals in the ore with novel reagents, two roughing processes using flotation columns are performed, eliminating the need for scavenging, to fully recover the zinc oxide minerals. Then, a single fine cleaning process using a flotation machine yields high-quality zinc oxide concentrate. This method achieves efficient recovery of limestone-type zinc oxide ore through a short process by linking flotation equipment and flotation reagents.

[0005] A method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit, the specific steps of which are as follows:

[0006] (1) Adjust the slurry of limestone-type zinc oxide ore to a slurry mass percentage concentration of 24-38%, add sodium sulfide, compound modifier and compound collector in sequence, and carry out a first flotation column roughing operation in the flotation column to obtain the first flotation column roughing concentrate and the first flotation column roughing tailings.

[0007] (2) Sodium sulfide, compound modifier and compound collector are added sequentially to the primary flotation column roughing tailings obtained in step (1), and secondary flotation column roughing operation is carried out in the flotation column to obtain secondary flotation column roughing concentrate and secondary flotation column roughing tailings; the secondary flotation column roughing tailings are flotation tailings.

[0008] (3) Combine the roughing concentrate obtained from the primary flotation column in step (1) and the roughing concentrate obtained from the secondary flotation column in step (2), add a compound collector, and perform flotation machine cleaning operation in the flotation machine to obtain flotation machine cleaned concentrate and flotation machine cleaned tailings. The flotation machine cleaned tailings are returned to the pulp and fed into the secondary flotation column roughing operation. The flotation machine cleaned concentrate is flotation zinc concentrate.

[0009] The compound modifier is a mixture of soda ash, sodium hexametaphosphate and lignin sulfonate, and the compound collector is a mixture of dodecylamine acetate, sodium cocoyl sulfate, laurylamine polyoxyethylene ether and dodecyltrimethylammonium sulfate.

[0010] Preferably, the zinc content in the limestone-type zinc oxide ore in step (1) is 5.3-10.7% by mass.

[0011] Preferably, per ton of limestone-type zinc oxide ore, 6500~9500g of sodium sulfide, 750~1650g of compound modifier and 270~390g of compound collector are added to the slurry of the primary flotation column roughing operation in step (1).

[0012] Preferably, for every ton of limestone-type zinc oxide ore, 1300~1900g of sodium sulfide, 250~550g of compound modifier and 90~130g of compound collector are added to the slurry of the roughing operation of the secondary flotation column in step (2).

[0013] Preferably, 30-45g of compound collector is added to the slurry of the flotation machine in step (3) for each ton of limestone-type zinc oxide ore.

[0014] Preferably, based on the mass fraction of the compound modifier being 100%, the compound modifier contains 40-60% soda ash, 15-45% sodium hexametaphosphate, and 15-25% lignin sulfonate.

[0015] Preferably, based on a mass fraction of 100% for the compound collector, the compound collector contains 35-45% dodecylamine acetate, 30-40% sodium cocoyl sulfate, 10-20% laurylamine polyoxyethylene ether, and 5-15% dodecyltrimethylammonium sulfate.

[0016] The beneficial effects of this invention are:

[0017] (1) This invention targets limestone-type zinc oxide ore. By developing efficient flotation reagents, using flotation columns for roughing to ensure the effective recovery of coarse and fine zinc oxide minerals, and then using the strong turbulent dispersion of the flotation machine to finely clean and remove impurities from the zinc concentrate produced by the flotation column, it can not only significantly shorten the flotation process, but also improve the grade and recovery rate of zinc concentrate.

[0018] (2) This invention fully leverages the advantages of both flotation columns and flotation machines in separating limestone-type zinc oxide ore by linking the flotation columns and flotation machines, significantly shortening the flotation process. The flotation columns are used for two roughing processes, eliminating the need for scavenging, which can fully recover zinc minerals. The flotation machines are used for one fine cleaning process to obtain high-quality zinc oxide concentrate, solving the problems of low flotation efficiency, long process flow, and poor separation effect of traditional processes.

[0019] (3) The present invention enhances the electrostatic repulsion between particles by selectively adsorbing compound modifiers on ore particles, which promotes the dispersion of mineral particles and weakens the covering of ore slime on the surface of zinc oxide minerals; at the same time, the compound modifiers can also enhance the masking effect on the active sites on the surface of gangue minerals, preventing the subsequent collectors from being adsorbed in large quantities on the surface of gangue minerals, thus avoiding the floating of gangue particles from the front end and effectively improving the grade of zinc concentrate.

[0020] (4) This invention selectively enhances the hydrophobicity of zinc oxide minerals by developing a compound collector, which significantly enhances the difference in floatability between zinc oxide minerals and gangue minerals. At the same time, it also improves the stability, fluidity and viscosity of flotation foam products, enabling them to efficiently carry minerals and dissipate in time in flotation columns and flotation machines. This greatly improves the flotation efficiency and recovery rate of limestone-type zinc oxide minerals and reduces the consumption of flotation reagents.

[0021] (5) In the process of flotation of limestone-type zinc oxide ore, this invention can not only effectively recover coarse-grained zinc oxide minerals in the ore by reasonably configuring flotation equipment and flotation reagents, but also utilize the characteristic that bubbles have a long residence time in the flotation column to promote the stable adhesion of fine-grained zinc oxide minerals to bubbles, thus realizing the efficient recovery of all-grained zinc oxide minerals in a short process, opening up a new way for the efficient separation of this type of resource. Attached Figure Description

[0022] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to specific embodiments, but the scope of protection of the present invention is not limited to the content described.

[0024] In the following embodiments of the present invention, the compound modifier is a mixture of soda ash, sodium hexametaphosphate and lignin sulfonate, and the compound collector is a mixture of dodecylamine acetate, sodium cocoyl sulfate, laurylamine polyoxyethylene ether and dodecyltrimethylammonium sulfate.

[0025] Example 1: In this example, the compound modifier has a mass fraction of 100%, and the compound modifier contains 40% soda ash, 45% sodium hexametaphosphate, and 15% lignin sulfonate; the compound collector has a mass fraction of 100%, and the compound collector contains 35% dodecylamine acetate, 40% sodium cocoyl sulfate, 10% laurylamine polyoxyethylene ether, and 15% dodecyl trimethyl ammonium sulfate.

[0026] like Figure 1 As shown, a method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit includes the following specific steps:

[0027] (1) Adjust the pulp of limestone zinc oxide ore to a pulp mass percentage concentration of 24%, and add sodium sulfide, compound modifier and compound collector in sequence. Perform a first flotation column roughing operation in the flotation column to obtain the first flotation column roughing concentrate and the first flotation column roughing tailings; wherein the zinc mass percentage content in the limestone zinc oxide ore is 5.3%; based on each ton of limestone zinc oxide ore, add 6500g of sodium sulfide, 750g of compound modifier and 270g of compound collector to the pulp of the first flotation column roughing operation;

[0028] (2) Sodium sulfide, compound modifier and compound collector are added sequentially to the roughing tailings obtained in step (1) and a second flotation column roughing operation is carried out in the flotation column to obtain the second flotation column roughing concentrate and the second flotation column roughing tailings; based on each ton of limestone-type zinc oxide ore, 1300g of sodium sulfide, 250g of compound modifier and 90g of compound collector are added to the slurry of the second flotation column roughing operation; the second flotation column roughing tailings are flotation tailings;

[0029] (3) Combine the roughing concentrate obtained from the primary flotation column in step (1) and the roughing concentrate obtained from the secondary flotation column in step (2), add a compound collector, and perform flotation machine cleaning operation in the flotation machine to obtain flotation machine cleaned concentrate and flotation machine cleaned tailings. The flotation machine cleaned tailings are returned to the pulp for mixing and then added to the secondary flotation column roughing operation. 30g of compound collector is added to the pulp of the flotation machine cleaning operation per ton of limestone-type zinc oxide ore. The flotation machine cleaned concentrate is flotation zinc concentrate.

[0030] In this embodiment, the zinc flotation recovery rate was 82.3%.

[0031] Example 2: In this example, the compound modifier has a mass fraction of 100%, and the compound modifier contains 50% soda ash, 30% sodium hexametaphosphate, and 20% lignin sulfonate; the compound collector has a mass fraction of 100%, and the compound collector contains 40% dodecylamine acetate, 35% sodium cocoyl sulfate, 15% laurylamine polyoxyethylene ether, and 10% dodecyltrimethylammonium sulfate.

[0032] like Figure 1 As shown, a method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit includes the following specific steps:

[0033] (1) Adjust the pulp of limestone zinc oxide ore to a pulp mass percentage concentration of 31%, and add sodium sulfide, compound modifier and compound collector in sequence. Perform a first flotation column roughing operation in the flotation column to obtain the first flotation column roughing concentrate and the first flotation column roughing tailings; wherein the zinc mass percentage content in the limestone zinc oxide ore is 8.0%; based on each ton of limestone zinc oxide ore, add 8000g of sodium sulfide, 1200g of compound modifier and 330g of compound collector to the pulp of the first flotation column roughing operation;

[0034] (2) Sodium sulfide, compound modifier and compound collector are added sequentially to the roughing tailings obtained in step (1) and a second flotation column roughing operation is carried out in the flotation column to obtain the second flotation column roughing concentrate and the second flotation column roughing tailings; based on each ton of limestone-type zinc oxide ore, 1600g of sodium sulfide, 400g of compound modifier and 110g of compound collector are added to the slurry of the second flotation column roughing operation; the second flotation column roughing tailings are flotation tailings;

[0035] (3) Combine the roughing concentrate obtained from the primary flotation column in step (1) and the roughing concentrate obtained from the secondary flotation column in step (2), add a compound collector, and perform flotation machine cleaning operation in the flotation machine to obtain flotation machine cleaned concentrate and flotation machine cleaned tailings. The flotation machine cleaned tailings are returned to the pulp for mixing and then added to the secondary flotation column roughing operation. 35g of compound collector is added to the pulp of the flotation machine cleaning operation per ton of limestone-type zinc oxide ore. The flotation machine cleaned concentrate is flotation zinc concentrate.

[0036] In this embodiment, the zinc flotation recovery rate was 84.5%.

[0037] Example 3: In this example, the compound modifier has a mass fraction of 100%, and the compound modifier contains 60% soda ash, 15% sodium hexametaphosphate, and 25% lignin sulfonate; the compound collector has a mass fraction of 100%, and the compound collector contains 45% dodecylamine acetate, 30% sodium cocoyl sulfate, 20% laurylamine polyoxyethylene ether, and 5% dodecyltrimethylammonium sulfate.

[0038] like Figure 1 As shown, a method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit includes the following specific steps:

[0039] (1) Adjust the pulp of limestone zinc oxide ore to a pulp mass percentage concentration of 38%, and add sodium sulfide, compound modifier and compound collector in sequence. Perform a first flotation column roughing operation in the flotation column to obtain a first flotation column roughing concentrate and a first flotation column roughing tailings; wherein the zinc mass percentage content in the limestone zinc oxide ore is 10.7%; based on each ton of limestone zinc oxide ore, add 9500g of sodium sulfide, 1650g of compound modifier and 390g of compound collector to the pulp of the first flotation column roughing operation;

[0040] (2) Sodium sulfide, compound modifier and compound collector are added sequentially to the roughing tailings obtained in step (1) and a second flotation column roughing operation is carried out in the flotation column to obtain the second flotation column roughing concentrate and the second flotation column roughing tailings; based on each ton of limestone-type zinc oxide ore, 1900g of sodium sulfide, 550g of compound modifier and 130g of compound collector are added to the slurry of the second flotation column roughing operation; the second flotation column roughing tailings are flotation tailings;

[0041] (3) Combine the roughing concentrate obtained from the primary flotation column in step (1) and the roughing concentrate obtained from the secondary flotation column in step (2), add a compound collector, and perform flotation machine cleaning operation in the flotation machine to obtain flotation machine cleaned concentrate and flotation machine cleaned tailings. The flotation machine cleaned tailings are returned to the pulp for mixing and then added to the secondary flotation column roughing operation. 45g of compound collector is added to the pulp of the flotation machine cleaning operation per ton of limestone-type zinc oxide ore. The flotation machine cleaned concentrate is flotation zinc concentrate.

[0042] In this embodiment, the zinc flotation recovery rate was 85.7%.

[0043] The specific embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit, characterized in that, The specific steps are as follows: (1) Adjust the slurry of limestone-type zinc oxide ore to a slurry mass percentage concentration of 24-38%, add sodium sulfide, compound modifier and compound collector in sequence, and carry out a first flotation column roughing operation in the flotation column to obtain the first flotation column roughing concentrate and the first flotation column roughing tailings. (2) Sodium sulfide, compound modifier and compound collector are added sequentially to the primary flotation column roughing tailings obtained in step (1), and secondary flotation column roughing operation is carried out in the flotation column to obtain secondary flotation column roughing concentrate and secondary flotation column roughing tailings; the secondary flotation column roughing tailings are flotation tailings. (3) Combine the roughing concentrate obtained from the primary flotation column in step (1) and the roughing concentrate obtained from the secondary flotation column in step (2), add a compound collector, and perform flotation machine cleaning operation in the flotation machine to obtain flotation machine cleaned concentrate and flotation machine cleaned tailings. The flotation machine cleaned tailings are returned to the pulp and fed into the secondary flotation column roughing operation. The flotation machine cleaned concentrate is flotation zinc concentrate. The compound modifier is a mixture of soda ash, sodium hexametaphosphate and lignin sulfonate, and the compound collector is a mixture of dodecylamine acetate, sodium cocoyl sulfate, laurylamine polyoxyethylene ether and dodecyltrimethylammonium sulfate.

2. The method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit according to claim 1, characterized in that: Step (1) The zinc content in the limestone-type zinc oxide ore is 5.3~10.7% by mass.

3. The method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit according to claim 1, characterized in that: For each ton of limestone-type zinc oxide ore, 6500~9500g of sodium sulfide, 750~1650g of compound modifier and 270~390g of compound collector are added to the slurry of the primary flotation column roughing operation in step (1).

4. The method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit according to claim 1, characterized in that: For every ton of limestone-type zinc oxide ore, 1300~1900g of sodium sulfide, 250~550g of compound modifier and 90~130g of compound collector are added to the slurry of the roughing operation of the secondary flotation column in step (2).

5. The method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit according to claim 1, characterized in that: For every ton of limestone-type zinc oxide ore, 30-45g of compound collector is added to the slurry of the flotation machine in step (3).

6. The method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit according to claim 1, characterized in that: Based on a mass fraction of 100% for the compound modifier, the compound modifier contains 40-60% soda ash, 15-45% sodium hexametaphosphate, and 15-25% lignin sulfonate.

7. The method for recovering limestone-type zinc oxide ore based on combined flotation of flotation column and flotation unit according to claim 1, characterized in that: Based on a mass fraction of 100% for the compound collector, the compound collector contains 35-45% dodecylamine acetate, 30-40% sodium cocoyl sulfate, 10-20% laurylamine polyoxyethylene ether, and 5-15% dodecyltrimethylammonium sulfate.

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