A compound adjusting agent and its application in lepidolite flotation

Abstract

The present invention relates to a composite adjusting agent and its application in the flotation of lepidolite, belonging to the field of mineral processing technology. In view of the problems that the surface properties of lepidolite and gangue minerals are similar, the difference in floatability is small, and the separation difficulty is great, the present invention adds a composite adjusting agent to selectively adsorb it on the surface of feldspar and quartz, reduces the reaction activity of gangue minerals and collectors, increases the flotation difference between lepidolite and gangue minerals in the ore, and improves the separation index of lepidolite ore. The composite adjusting agent is composed of ethylenediaminetetraacetic acid, citric acid, sodium silicate and polyaluminium chloride, and can produce a synergistic effect when used in combination with a collector, and can target and regulate the surface properties of minerals and the pulp environment, thereby reducing the stability of flotation foam, ensuring the smooth flotation process, and realizing the efficient separation and enrichment of complex and difficult-to-select lepidolite ore.

Description

Technical Field

[0001] The invention relates to a composite adjusting agent and application thereof in lepidolite flotation, belonging to the technical field of mineral processing. Background Art

[0002] Lepidolite is an important hard rock lithium-containing mineral, belonging to silicate minerals, often associated with feldspar, quartz and other gangue minerals. These minerals have similar surface properties and little difference in floatability. It is difficult to effectively separate lepidolite from feldspar, quartz and other gangue minerals using conventional flotation reagents. The quality of flotation lithium concentrate is poor and difficult to sell. In addition, lepidolite ore is often severely muddy. When using collectors for direct flotation, the ore mud will circulate and accumulate repeatedly in the flotation process. At the same time, the flotation foam has high stability, high viscosity, thick foam layer and poor fluidity, and the amount of flotation foam is large, making it difficult for the production process to proceed smoothly.

[0003] Therefore, it is urgent to develop effective regulators to improve the flotation interface and slurry solution environment of lithium mica, so as to effectively control the influence of ore slime on flotation and improve the separation and enrichment effect of lithium mica ore. Summary of the invention

[0004] In view of the problems that the surface properties of lithium mica and gangue minerals are similar, the difference in floatability is small, and the separation difficulty is great, the present invention provides a composite regulator and its application in lithium mica flotation. By adding the composite regulator, it is selectively adsorbed on the surface of feldspar and quartz, the reaction activity of gangue minerals and collectors is reduced, the flotation difference between lithium mica and gangue minerals in the ore is increased, and the separation index of lithium mica ore is improved. The composite regulator and collector can produce a synergistic effect when used in combination, and the surface properties of minerals and the pulp environment are targeted and regulated, thereby reducing the stability of flotation foam, ensuring the smooth flotation process, and realizing the efficient separation and enrichment of complex and difficult lithium mica ores.

[0005] A compound regulator is composed of ethylenediaminetetraacetic acid, citric acid, sodium silicate and polyaluminium chloride. Based on 100 parts of the compound regulator, the ethylenediaminetetraacetic acid is 25-35 parts, the citric acid is 30-40 parts, the sodium silicate is 20-30 parts and the polyaluminium chloride is 5-15 parts.

[0006] The application method of the compound adjusting agent in the flotation of lepidolite comprises the following specific steps:

[0007] (1) crushing and grinding the lepidolite ore to fully dissociate the lepidolite minerals in the ore, and adding water to adjust the slurry to a slurry mass concentration of 30 to 38%;

[0008] (2) adding a compound adjusting agent and a collecting agent to the ore slurry in step (1) in sequence, and performing a roughing operation to obtain a roughing concentrate and a roughing tailing;

[0009] (3) adding a composite adjusting agent and a collecting agent to the roughing concentrate in step (2) in sequence, and performing a concentration operation to obtain lithium concentrate I and concentrated tailings;

[0010] (4) adding a compound adjusting agent and a collecting agent to the roughing tailings in step (2) in sequence, and performing scavenging operations to obtain scavenged concentrate and scavenged tailings, wherein the scavenged tailings are flotation tailings;

[0011] (5) combining the selected tailings of step (3) and the scavenged concentrate of step (4) to prepare a slurry, and then sequentially adding a compound adjusting agent and a collecting agent to perform a fine scavenging operation to obtain lithium concentrate II and fine scavenging tailings, and returning the fine scavenging tailings to prepare a slurry and incorporate them into the scavenging operation;

[0012] (6) The lithium concentrate I obtained in step (3) and the lithium concentrate II obtained in step (5) are combined to obtain a lithium concentrate product.

[0013] Preferably, the collector is a mixture of dodecylamine acetate, sodium lauryl sulfate and diesel, with 50-60 parts of dodecylamine acetate, 25-45 parts of sodium lauryl sulfate and 5-15 parts of diesel being present based on 100 parts of the collector.

[0014] Preferably, the mass percentage content of Li2O in the lithium mica ore in step (1) is 0.32-0.64%.

[0015] Calculated per ton of lepidolite ore, 400-600 g of a compound adjusting agent and 300-450 g of a collector are added to the ore pulp of the roughing operation in step (2).

[0016] Calculated per ton of lithium mica ore, 50-100g of the compound adjusting agent and 30-50g of the collecting agent are added to the ore pulp of the concentrating operation in step (3).

[0017] Based on each ton of lithium mica ore, 100 to 200 g of a compound adjusting agent and 100 to 150 g of a collector are added to the slurry of the scavenging operation in step (4).

[0018] Based on each ton of lithium mica ore, 150 to 250 g of a compound adjusting agent and 60 to 100 g of a collector are added to the slurry of the fine sweeping operation in step (5).

[0019] The beneficial effects of the present invention are:

[0020] (1) The composite regulator developed by the present invention can eliminate calcium and magnesium ions in the flotation water to prevent them from affecting the performance of the collector, as well as the surface properties and floatability of lepidolite and gangue minerals; at the same time, it can desorb metal ions adsorbed on the surface of the minerals to avoid non-selective activation or inhibition of the mineral surface, thereby preventing homogenization of the surface of lepidolite and gangue minerals in the ore;

[0021] (2) The present invention adopts the method of adding a composite regulator to selectively adsorb the composite regulator on the surface of feldspar and quartz, thereby reducing the reactivity of gangue minerals with collectors, increasing the flotation difference between lepidolite and gangue minerals in the ore, and improving the sorting index of lepidolite ore, thereby economically and efficiently solving the problems of similar surface properties of lepidolite and gangue minerals, small difference in floatability, and great difficulty in sorting;

[0022] (3) The compound adjusting agent used in the present invention can capture fine-grained minerals in the slurry solution, selectively regulate the occurrence form of the sludge through electrical neutralization and bridging adsorption, and effectively avoid the vicious cycle of sludge in the flotation process without returning the intermediate ore to the roughing and concentrating process;

[0023] (4) The compound adjusting agent used in the present invention is green and non-toxic, has a simple preparation process, stable properties, is easy to use, and has strong controllability. At the same time, it can produce a synergistic effect when used in combination with a collector, and can target and regulate the surface properties of the mineral and the pulp environment, thereby reducing the stability of the flotation foam, ensuring the smooth progress of the flotation process, and realizing the efficient separation and enrichment of complex and difficult-to-select lithium mica ores. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with specific implementation modes, but the protection scope of the present invention is not limited to the described contents.

[0026] In the following embodiments of the present invention, the flotation process includes a roughing process, a scavenging process, a cleaning process and a fine scavenging process. The middlings are not returned to the roughing and cleaning processes. The compound adjusting agent is composed of ethylenediaminetetraacetic acid, citric acid, sodium silicate and polyaluminium chloride, and the collector is composed of dodecylamine acetate, sodium lauryl sulfate and diesel.

[0027] Example 1: In this example, based on 100 parts of the mass of the compound regulator, 35 parts of ethylenediaminetetraacetic acid, 35 parts of citric acid, 25 parts of sodium silicate, and 5 parts of polyaluminium chloride are used; based on 100 parts of the mass of the collector, 50 parts of dodecylamine acetate, 45 parts of sodium lauryl sulfate, and 5 parts of diesel are used;

[0028] The application method of the compound adjusting agent in the flotation of lepidolite (see Figure 1 ), the specific steps are as follows:

[0029] (1) crushing and grinding the lithium mica ore to fully dissociate the lithium mica minerals in the ore, adding water to adjust the slurry to a mass percentage concentration of 30%, wherein the mass percentage content of Li2O in the lithium mica ore is 0.32%;

[0030] (2) adding a compound adjusting agent and a collector to the ore pulp in step (1) in sequence, and performing a roughing operation to obtain a roughing concentrate and a roughing tailing; per ton of lepidolite ore, 400 g of the compound adjusting agent and 300 g of the collector are added to the ore pulp of the roughing operation;

[0031] (3) adding a composite adjusting agent and a collector to the roughing concentrate in step (2) in sequence, and performing a concentration operation to obtain a lithium concentrate I and a concentrated tailing; per ton of lithium mica ore, 50 g of the composite adjusting agent and 30 g of the collector are added to the slurry of the concentration operation;

[0032] (4) adding a compound adjusting agent and a collector to the roughing tailings in step (2) in sequence, and performing scavenging operation to obtain scavenging concentrate and scavenging tailings, wherein the scavenging tailings are flotation tailings; per ton of lithium mica ore, 100 g of the compound adjusting agent and 100 g of the collector are added to the slurry of the scavenging operation;

[0033] (5) The tailings of step (3) and the scavenging concentrate of step (4) are combined and slurried, and then a compound adjusting agent and a collector are added in sequence to perform fine scavenging operation to obtain lithium concentrate II and fine scavenging tailings, and the fine scavenging tailings are returned to the slurry for slurry mixing and incorporated into the scavenging operation; per ton of lithium mica ore, 150 g of the compound adjusting agent and 60 g of the collector are added to the slurry of the fine scavenging operation;

[0034] (6) combining the lithium concentrate I obtained in step (3) and the lithium concentrate II obtained in step (5) to obtain a lithium concentrate product;

[0035] The flotation recovery rate of lithium in this example is 86.3%.

[0036] Example 2: In this example, based on 100 parts of the mass of the compound regulator, 30 parts of ethylenediaminetetraacetic acid, 40 parts of citric acid, 20 parts of sodium silicate, and 10 parts of polyaluminium chloride are used; based on 100 parts of the mass of the collector, 55 parts of dodecylamine acetate, 35 parts of sodium lauryl sulfate, and 10 parts of diesel are used;

[0037] The application method of the compound adjusting agent in the flotation of lepidolite (see Figure 1 ), the specific steps are as follows:

[0038] (1) crushing and grinding the lepidolite ore to fully dissociate the lepidolite minerals in the ore, adding water to adjust the slurry to a slurry mass percentage concentration of 34%, wherein the mass percentage content of Li2O in the lepidolite ore is 0.48%;

[0039] (2) adding a composite adjusting agent and a collector to the ore pulp in step (1) in sequence, and performing a roughing operation to obtain a roughing concentrate and a roughing tailing; per ton of lepidolite ore, 500 g of the composite adjusting agent and 375 g of the collector are added to the ore pulp of the roughing operation;

[0040] (3) adding a composite adjusting agent and a collector to the roughing concentrate in step (2) in sequence, and performing a concentration operation to obtain a lithium concentrate I and a concentrated tailing; per ton of lithium mica ore, 75 g of the composite adjusting agent and 40 g of the collector are added to the slurry of the concentration operation;

[0041] (4) adding a compound adjusting agent and a collector to the roughing tailings in step (2) in sequence, and performing scavenging operation to obtain scavenging concentrate and scavenging tailings, wherein the scavenging tailings are flotation tailings; per ton of lithium mica ore, 150 g of the compound adjusting agent and 125 g of the collector are added to the slurry of the scavenging operation;

[0042] (5) The tailings of step (3) and the scavenging concentrate of step (4) are combined for slurry preparation, and then a compound adjusting agent and a collector are added in sequence to perform fine scavenging operation to obtain lithium concentrate II and fine scavenging tailings, and the fine scavenging tailings are returned for slurry preparation and incorporated into the scavenging operation; per ton of lithium mica ore, 200 g of the compound adjusting agent and 80 g of the collector are added to the slurry of the fine scavenging operation;

[0043] (6) combining the lithium concentrate I obtained in step (3) and the lithium concentrate II obtained in step (5) to obtain a lithium concentrate product;

[0044] The flotation recovery rate of lithium in this example is 88.1%.

[0045] Example 3: In this example, based on 100 parts of the mass of the compound regulator, 25 parts of ethylenediaminetetraacetic acid, 30 parts of citric acid, 30 parts of sodium silicate, and 15 parts of polyaluminium chloride are used; based on 100 parts of the mass of the collector, 60 parts of dodecylamine acetate, 25 parts of sodium lauryl sulfate, and 15 parts of diesel are used;

[0046] The application method of the compound adjusting agent in the flotation of lepidolite (see Figure 1 ), the specific steps are as follows:

[0047] (1) crushing and grinding the lepidolite ore to fully dissociate the lepidolite minerals in the ore, adding water to adjust the slurry to a slurry mass percentage concentration of 38%, wherein the mass percentage content of Li2O in the lepidolite ore is 0.64%;

[0048] (2) adding a composite adjusting agent and a collector to the ore pulp in step (1) in sequence, and performing a roughing operation to obtain a roughing concentrate and a roughing tailing; per ton of lepidolite ore, 600 g of the composite adjusting agent and 450 g of the collector are added to the ore pulp of the roughing operation;

[0049] (3) adding a composite adjusting agent and a collector to the roughing concentrate in step (2) in sequence, and performing a concentration operation to obtain a lithium concentrate I and a concentrated tailing; per ton of lithium mica ore, 100 g of the composite adjusting agent and 50 g of the collector are added to the slurry of the concentration operation;

[0050] (4) adding a compound adjusting agent and a collector to the roughing tailings in step (2) in sequence, and performing scavenging operation to obtain scavenging concentrate and scavenging tailings, wherein the scavenging tailings are flotation tailings; per ton of lithium mica ore, 200 g of the compound adjusting agent and 150 g of the collector are added to the slurry of the scavenging operation;

[0051] (5) The tailings of step (3) and the scavenging concentrate of step (4) are combined for slurry preparation, and then a compound adjusting agent and a collector are added in sequence to perform fine scavenging operation to obtain lithium concentrate II and fine scavenging tailings, and the fine scavenging tailings are returned for slurry preparation and incorporated into the scavenging operation; per ton of lithium mica ore, 250 g of the compound adjusting agent and 100 g of the collector are added to the slurry of the fine scavenging operation;

[0052] (6) combining the lithium concentrate I obtained in step (3) and the lithium concentrate II obtained in step (5) to obtain a lithium concentrate product;

[0053] The flotation recovery rate of lithium in this example is 89.5%.

[0054] The specific implementation modes of the present invention are described in detail above, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. The application of the compound adjusting agent in the flotation of lepidolite is characterized by: The compound adjusting agent is composed of ethylenediaminetetraacetic acid, citric acid, sodium silicate and polyaluminium chloride. Based on 100 parts of the compound adjusting agent, ethylenediaminetetraacetic acid is 25-35 parts, citric acid is 30-40 parts, sodium silicate is 20-30 parts, and polyaluminium chloride is 5-15 parts. The specific steps of the application method are as follows: (1) crushing and grinding the lepidolite ore to fully dissociate the lepidolite minerals in the ore, and adding water to adjust the slurry to a slurry mass concentration of 30 to 38%; (2) adding a compound adjusting agent and a collecting agent to the ore slurry in step (1) in sequence, and performing a roughing operation to obtain a roughing concentrate and a roughing tailing; (3) adding a composite adjusting agent and a collecting agent to the roughing concentrate in step (2) in sequence, and performing a concentration operation to obtain lithium concentrate I and concentrated tailings; (4) adding a compound adjusting agent and a collecting agent to the roughing tailings in step (2) in sequence, and performing scavenging operations to obtain scavenged concentrate and scavenged tailings, wherein the scavenged tailings are flotation tailings; (5) combining the selected tailings of step (3) and the scavenged concentrate of step (4) to prepare a slurry, and then sequentially adding a compound adjusting agent and a collecting agent to perform a fine scavenging operation to obtain lithium concentrate II and fine scavenging tailings, and returning the fine scavenging tailings to prepare a slurry and incorporate them into the scavenging operation; (6) combining the lithium concentrate I obtained in step (3) and the lithium concentrate II obtained in step (5) to obtain a lithium concentrate product; The collector is a mixture of dodecylamine acetate, sodium lauryl sulfate and diesel.

2. The application according to claim 1, characterized in that: Based on 100 parts of the collector, the amount of dodecylamine acetate is 50-60 parts, the amount of sodium lauryl sulfate is 25-45 parts, and the amount of diesel is 5-15 parts.

3. The application according to claim 1, characterized in that: The mass percentage content of Li2O in the lithium mica ore in step (1) is 0.32-0.64%.

4. The application according to claim 1, characterized in that: Based on each ton of lithium mica ore, 400-600 g of a compound adjusting agent and 300-450 g of a collector are added to the ore pulp of the roughing operation in step (2).

5. The application according to claim 1, characterized in that: Based on each ton of lithium mica ore, 50-100 g of a compound adjusting agent and 30-50 g of a collector are added to the slurry of the concentrating operation in step (3).

6. The use according to claim 1, characterized in that: Based on each ton of lithium mica ore, 100 to 200 g of a compound adjusting agent and 100 to 150 g of a collector are added to the slurry of the scavenging operation in step (4).

7. The use according to claim 1, characterized in that: Based on each ton of lithium mica ore, 150-250 g of a compound adjusting agent and 60-100 g of a collecting agent are added to the slurry of the fine sweeping operation in step (5).

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