Collecting agent for flotation of picromerite at high temperature and application of collecting agent

Abstract

The invention discloses a collecting agent for flotation of picromerite at high temperature and application of the collecting agent, the collecting agent is alkyl benzene sulfonic acid isopropanolamine salt, specifically any one of dodecyl benzene sulfonic acid isopropanolamine salt, tetradecyl benzene sulfonic acid isopropanolamine salt and hexadecyl benzene sulfonic acid isopropanolamine salt; the collecting agent is mainly used for recovering picromerite through flotation at high temperature, the floatability of picromerite can be effectively enhanced, and the flotation recovery rate is increased. By adding the collecting agent in stages, non-selective adsorption of the collecting agent on the surface of non-target minerals can be reduced, the problem that the grade of picromerite flotation concentrate is low in high-temperature weather is solved, and efficient recovery of picromerite in the high-temperature environment in summer is achieved.

Description

Technical Field

[0001] The invention relates to a collector for flotation of kainite at high temperature and application thereof, belonging to the technical field of mineral processing flotation agents. Background Art

[0002] my country's potassium resources are generally scarce, with approximately 50% dependent on imports. However, my country ranks first in the world in potash fertilizer consumption, accounting for approximately 25% of global consumption. my country's potassium resources primarily consist of potassium-containing brines, concentrated in areas such as the Qaidam Basin in Qinghai (80%) and the Lop Nur Salt Lake area in Xinjiang (16%).

[0003] CN02143641.X discloses a method for producing potassium sulfate from magnesium sulfate-containing brine. Using magnesium sulfate-containing brine from the Lop Nur Salt Lake as the initial raw material, potassium chloride and langbeinite are obtained through decomposition, conversion, and flotation. The resulting potassium chloride and langbeinite are then converted and crystallized to produce potassium sulfate, resulting in a process for producing potassium sulfate from magnesium sulfate-containing brine from the Lop Nur Salt Lake, with completely independent intellectual property rights.

[0004] CN201410241330.X discloses a method for preparing leonite using mother liquor of potassium sulfate produced by conversion method and sodium sulfate as raw materials, wherein the leonite prepared by flotation metathesis conversion of sodium dodecylsulfonate can be obtained. + A wet product of soft potassium magnesium sulfate with a content of about 16.64% and a recovery rate of about 51.28%.

[0005] CN202010371557.1 discloses a method for the co-production of potassium magnesium sulfate fertilizer, potassium chloride and potassium sulfate, in which alkyl sulfonate and alkyl sulfate anionic collectors are used to float potassium-sulfur mixed salt concentrate, and soft potassium magnesium sulfate is obtained after conversion.

[0006] CN202211624677.3 discloses a soft potassium magnesium sulfate flotation composite reagent, the sulfonic acid group -SO3 in the reagent 2- It has a strong affinity for leonite, undergoes a strong complexation with magnesium atoms and is adsorbed on the surface of leonite minerals, but has no affinity for sodium chloride, and can selectively recover leonite. At the same time, its foaming agent can promote the adhesion of leonite particles and bubbles after the adsorption of the collector, which can significantly improve the grade and recovery rate of leonite. + The recovery rate reached 97%, Na + The content is less than 2%.

[0007] Soft potassium magnesium alum (K2SO4·MgSO4·6H2O) is the core raw material for the production of potassium magnesium sulfate fertilizer. The summer temperature in mining areas such as the Qinghai Salt Lake often reaches 30-35°C. However, the above-mentioned patents and traditional flotation processes have problems such as poor reagent stability and deterioration of bubble stability at these temperatures. High temperatures intensify bubble mergers, and anion collectors (such as sodium dodecyl sulfate) need to be used in extremely high dosages to maintain the foam layer. In addition, the sodium chloride entrainment rate is relatively high. Summary of the Invention

[0008] In view of this, the present invention provides a collector for flotation of leonite at high temperature and its application. The collector of the present invention is alkylbenzenesulfonic acid isopropanolamine salt, which is used to improve the quality and reduce impurities of leonite under high temperature conditions, thereby significantly improving the flotation separation efficiency.

[0009] In order to achieve the above technical objectives, the present invention provides the following technical solutions: The collector of the present invention is alkylbenzenesulfonic acid isopropanolamine salt; the alkylbenzenesulfonic acid isopropanolamine salt is any one of dodecylbenzenesulfonic acid isopropanolamine salt, tetradecylbenzenesulfonic acid isopropanolamine salt and hexadecylbenzenesulfonic acid isopropanolamine salt.

[0010] The present invention also provides the use of the collector of langbeinite at high temperature, which comprises the following steps: (1) The raw potassium mixed salt ore is coarsely ground to a grinding concentration of 50wt% to 70wt%, and the particle size of the potassium mixed salt ore after grinding is -0.15 mm with a mass fraction of ≥50%; (2) feeding the ground material obtained in step (1) into a conversion tank for conversion, with a conversion time of 60 to 120 minutes and a conversion temperature of 30 to 40°C to obtain a solid-liquid mixture of soft potassium magnesium sulfate, i.e., flotation feed; (3) adding the collector alkylbenzenesulfonic acid isopropanolamine salt to the flotation feed obtained in step (2) for the first time and allowing it to act for 2 minutes, then adding the collector alkylbenzenesulfonic acid isopropanolamine salt again and allowing it to act for 2 minutes, scraping the foam and collecting the foam layer to obtain a soft potassium magnesium sulfate concentrate.

[0011] The alkylbenzenesulfonic acid isopropanolamine salt, a collector for flotation of soft potassium leonite at high temperature, provided by the present invention, has a stable molecular structure, can still maintain good surface activity under high temperature conditions, reduce surface tension, and synergistically weaken the bubble-ore particle adhesion energy barrier. Secondly, the alkylbenzenesulfonic acid isopropanolamine salt contains both hydrophobic and hydrophilic groups. The alkylbenzene ring has strong hydrophobicity. Both the sulfonic acid group and the amino group, which are hydrophilic groups, can bind to the Mg on the surface of the soft potassium leonite. 2+ and K + It forms a strong chemical adsorption and resists high temperature desorption. Finally, alkylbenzenesulfonic acid isopropanolamine salt is a mild surfactant with good foaming effect and also acts as a foaming agent.

[0012] The present invention adopts staged dosing. The first addition of collector ensures that the target mineral particles are effectively captured. The second addition of collector enhances the floating of difficult-to-float particles that were not effectively captured the first time due to surface contamination, uneven coverage of the collector, etc. The staged addition of the collector alkylbenzenesulfonic acid isopropanolamine salt can reduce the non-selective adsorption on the surface of non-target minerals such as ore mud, sodium salt, and epsom salt caused by the high instantaneous concentration of the collector in the ore pulp, enhance the interaction between the collector and the target mineral kaolinite, effectively capture the target mineral, improve the recovery rate of kaolinite, reduce the floating of impurities such as sodium chloride, sodium sulfate, and epsom salt, and improve the concentrate grade.

[0013] The beneficial effects of the present invention are: (1) The collector of the present invention has high temperature adaptability and can effectively react with soft potassium magnesium sulfate at a temperature of 30-40°C. It also has a foaming effect, which can enhance the floatability of soft potassium magnesium sulfate in high temperature weather and improve the flotation recovery rate.

[0014] (2) The collector of the present invention has a double hydrophilic group, has a strong adsorption effect on the surface of soft potassium magnesium sulfate mineral, and can effectively resist high-temperature desorption.

[0015] (3) The reagent addition method described in the present invention can enhance the selective adsorption of the collector on the surface of the soft potassium magnesium sulfate mineral, increase the floatability difference between the soft potassium magnesium sulfate and impurity minerals such as sodium chloride, sodium sulfate and epsom salt, and improve the concentrate grade.

[0016] (4) The collector of the present invention has excellent performance and is environmentally friendly, and can achieve the purpose of selectively separating soft potassium magnesium sulfate. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] Example 1: The collector alkylbenzenesulfonate isopropanolamine salt of the present embodiment is dodecylbenzenesulfonate isopropanolamine salt, which is used to capture leonite at high temperature. The specific steps are as follows: (1) 300 g of potassium mixed salt ore (element composition is K + 7.76%, Na + 7.70%, SO4 2- 26.30%, Cl - 23.87%, Mg 2+ 8.23%) and 150 g of fresh water for grinding, the grinding concentration is 70wt%, and the particle size of the potassium mixed salt ore after grinding is -0.15 mm with a mass fraction of 52.69%; (2) The ground material obtained in step (1) is fed into a conversion tank for conversion at a conversion time of 90 min and a conversion temperature of 35°C to obtain flotation feed; (3) After adding 120 g / t of collector isopropylamine dodecylbenzenesulfonate to the flotation feed obtained in step (2) for the first time and reacting for 2 minutes, 80 g / t of collector isopropylamine alkylbenzenesulfonate was added and reacted for 2 minutes, followed by scraping and foaming for 4 minutes to obtain a soft potassium magnesium sulfate concentrate and tailings in the flotation tank.

[0019] In this embodiment 1, K + The content is 15.52%, the recovery rate is 90.85%, Na + The content is 2.53%.

[0020] Example 2: The collector in this example is tetradecylbenzenesulfonic acid isopropanolamine salt, and the specific steps are as follows: (1) 300 g of potassium mixed salt ore (element composition is K + 7.71%, Na + 7.39%, SO4 2- 27.62%, Cl - 21.20%, Mg 2+ 9.41%) and 225 g of fresh water for grinding, the grinding concentration is 57wt%, and the particle size of the potassium mixed salt ore after grinding is -0.15 mm particle size mass fraction 50%; (2) The ground material obtained in step (1) is fed into a conversion tank for conversion at a conversion time of 60 min and a conversion temperature of 30°C to obtain flotation feed; (3) After adding 250 g / t of tetradecylbenzenesulfonic acid isopropanolamine salt as a collector to the flotation feed obtained in step (2) for the first time and reacting for 2 minutes, 100 g / t of tetradecylbenzenesulfonic acid isopropanolamine salt is added and reacted for 2 minutes, and then scraping and foaming for 6 minutes to obtain soft potassium magnesium sulfate concentrate and tailings in the flotation tank.

[0021] In this embodiment 2, K + The content is 15.26%, the recovery rate is 93.64%, Na + The content is 2.67%.

[0022] Example 3: The collector in this example is hexadecylbenzenesulfonic acid isopropanolamine salt, and the specific steps are as follows: (1) 300 g of potassium mixed salt ore (element composition is K + 8.23%, Na + 8.79%, SO4 2- 26.53%, Cl - 23.80%, Mg 2+8.16%) and 300 g of fresh water for grinding, the grinding concentration is 50wt%, and the particle size of the potassium mixed salt ore after grinding is -0.15 mm and the mass fraction of the particle size is 62.80%; (2) The ground material obtained in step (1) is fed into a conversion tank for conversion at a conversion time of 120 min and a conversion temperature of 40° C. to obtain flotation feed; (3) After adding 320 g / t of collector hexadecylbenzenesulfonic acid isopropanolamine salt to the flotation feed obtained in step (2) for the first time and reacting for 2 minutes, 180 g / t of collector hexadecylbenzenesulfonic acid isopropanolamine salt was added and reacted for 2 minutes, followed by scraping and foaming for 8 minutes to obtain soft potassium magnesium sulfate concentrate and tailings in the flotation tank.

[0023] In this embodiment 3, K + The content is 15.17%, the recovery rate is 92.39%, Na + The content is 3.08%.

[0024] The above describes in detail the specific embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

[0025] The above describes in detail the specific embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A collector for flotation of langbeinite at high temperature, characterized in that: The collector is alkylbenzenesulfonic acid isopropanolamine salt.

2. The collector for flotation of langbeinite at high temperature according to claim 1, characterized in that: The alkylbenzenesulfonic acid isopropanolamine salt is any one of dodecylbenzenesulfonic acid isopropanolamine salt, tetradecylbenzenesulfonic acid isopropanolamine salt, and hexadecylbenzenesulfonic acid isopropanolamine salt.

3. The use of the collector for flotation of langbeinite at high temperature according to claim 1 or 2, characterized in that: Alkylbenzenesulfonic acid isopropanolamine salt is used as a collector to float kainite at high temperature. The specific steps are as follows: (1) The raw potassium mixed salt ore is coarsely ground to a grinding concentration of 50wt% to 70wt%, and the particle size of the potassium mixed salt ore after grinding is -0.15 mm with a mass fraction of ≥50%; (2) feeding the ground material obtained in step (1) into a conversion tank for conversion, with a conversion time of 60 to 120 minutes and a conversion temperature of 30 to 40°C to obtain a solid-liquid mixture of soft potassium magnesium sulfate, i.e., flotation feed; (3) adding the collector alkylbenzenesulfonic acid isopropanolamine salt to the flotation feed obtained in step (2) for the first time and allowing it to act for 2 minutes, then adding the collector alkylbenzenesulfonic acid isopropanolamine salt again and allowing it to act for 2 minutes, aerating and scraping the foam, collecting the foam layer, and obtaining a soft potassium magnesium sulfate concentrate.

4. The use of a collector for flotation of langbeinite at high temperature according to claim 3, characterized in that: In step (3), the collector is added twice, with a total amount of 200~500 g / t.

5. The use of a collector for flotation of langbeinite at high temperature according to claim 3, characterized in that: In step (3), the flotation pulp temperature is 30-40°C, and the flotation scraping time is 4-8 minutes.