CN111841897B - Use method of combined defoaming agent for amine flotation collector - Google Patents
Use method of combined defoaming agent for amine flotation collector Download PDFInfo
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- CN111841897B CN111841897B CN202010668375.0A CN202010668375A CN111841897B CN 111841897 B CN111841897 B CN 111841897B CN 202010668375 A CN202010668375 A CN 202010668375A CN 111841897 B CN111841897 B CN 111841897B
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- flotation
- defoaming agent
- amine
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- amine flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
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Abstract
A combined defoaming agent for amine flotation collector and its application method, it is made up of phenol ether derivative, short-chain mixed hydrocarbon and polydimethyl siloxane; the molecular formula of the phenol ether derivative is C8H17-Ph-O- [ CH2-CH2-O ] n-H; the short-chain mixed hydrocarbon is a mixture containing straight-chain alkane, branched-chain alkane, cycloalkane and aromatic hydrocarbon with 9-18C atoms; the molecular weight of the polydimethylsiloxane is 5000-100000; the method comprises the following steps: and adding the combined defoaming agent for the amine flotation collecting agent into the amine flotation collecting agent, uniformly mixing, and collecting quartz by taking the mixed material as a defoaming collecting agent. The flotation combined medicament has the advantages of safe and nontoxic raw materials, simple preparation method, stable chemical components and properties, and small using amount in use, and can effectively reduce foams generated in the flotation process, so that the flotation process is more stable.
Description
Technical Field
The invention belongs to the technical field of mineral flotation reagents, and particularly relates to a combined defoaming agent for an amine flotation collector and a using method thereof.
Background
At present, the poor ore sorting work has the problems of low efficiency, high cost, greater difficulty and the like. Flotation is a technology for separating in gas-liquid-solid three-phase fluid based on physical and chemical properties of various particles or particle surfaces; feeding the adjusted ore pulp into a flotation tank, stirring and aerating; the ore particles in the ore pulp contact and collide with the bubbles, the ore particles with good floatability selectively adhere to the bubbles and are carried to rise to form a mineralized foam layer consisting of gas-liquid-solid three phases, and the mineralized foam layer is mechanically scraped or overflows from the surface of the ore pulp, dehydrated and dried to form an ore concentrate product; in the flotation process, the problem of groove running caused by excessive foam is often generated, particularly in the cation flotation process, and the foam is sticky, large in quantity and difficult to dissipate.
The defoaming agent affects the half-life period of foam by acting on the foam structure, and further affects the volume of the foam generated in the actual flotation process; the mechanism of foam structure destruction of defoamers varies and is determined by their structure and properties and the foam system targeted; mainly comprises the following steps of reducing the viscosity of the foam, spreading and reducing the surface tension of a spreading part, and carrying out chemical reaction with components in a foam system.
The defoaming is carried out by adopting a physical method alone, the effect is poor, and the popularization and the application in the flotation industry are difficult. At present, a fluid jet method, namely water jet defoaming, is a commonly adopted physical method in the aspect of flotation foam elimination, the defoaming is insufficient, a large amount of water resources are wasted, and ore pulp is diluted. Still other plants use cofferdams to enclose the foam by standing, and the main function of the defoaming agent is to destroy the stability of the foam, so the method has low efficiency and large workload. The defoaming agent has the functions of accelerating the foam to break, preventing the foam from running out of the tank and promoting the flotation process to be more stable.
Disclosure of Invention
The invention aims to provide a combined defoaming agent for an amine flotation collector and a using method thereof, and aims to design the combined defoaming agent which can efficiently reduce the foam amount and quickly defoam aiming at solving the problems of viscous foam, large foam amount, difficult defoaming and the like of the existing amine flotation collector, and quickly defoam to ensure that the flotation process is more stable.
The combined defoaming agent for the amine flotation collector consists of phenol ether derivatives, short-chain mixed hydrocarbon and polydimethylsiloxane; the molecular formula of the phenol ether derivative is C8H17-Ph-O- [ CH2-CH2-O ] n-H, wherein n is 1-100; the short-chain mixed hydrocarbon is a mixture of straight-chain alkane, branched-chain alkane, cycloalkane and aromatic hydrocarbon with 9-18C atoms; the molecular weight of the polydimethylsiloxane is 5000-100000.
The mass ratio of the phenol ether derivative, the short-chain mixed hydrocarbon and the polydimethylsiloxane in the combined defoaming agent for the amine flotation collector is (0.5-0.8): (1-1.4): 2-4).
The preparation method of the combined defoaming agent for the amine flotation collector comprises the following steps:
uniformly mixing the phenol ether derivative, the short-chain mixed hydrocarbon and the polydimethylsiloxane according to the mass ratio of (0.5-0.8) to (1-1.4) to (2-4).
The use method of the combined defoaming agent for the amine flotation collector comprises the following steps:
in the process of iron ore flotation, when quartz in iron ore is captured, before an amine flotation collector is added, a combined defoaming agent for the amine flotation collector is added into the amine flotation collector and uniformly mixed, and the mixing proportion is 1 (100-400) of the combined defoaming agent for the amine flotation collector according to the mass ratio; and then collecting the quartz by taking the mixed material as a defoaming collector.
After the combined defoaming agent for the amine flotation collector is used in the above mode, the volume ratio of the foam formed after the flotation is finished is reduced by 1/3-1/2 without adding the combined defoaming agent for the amine flotation collector.
The combined defoaming agent for the amine flotation collector can reduce the surface tension of foam, enables active ingredients to be better dispersed in a foam system, and has a defoaming effect on the flotation collector of oxidized ore (iron ore) through the combined action of the foam and the active ingredients.
The flotation combined medicament has the advantages of safe and nontoxic raw materials, simple preparation method, stable chemical components and properties, and small using amount in use, and can effectively reduce foams generated in the flotation process, so that the flotation process is more stable.
Detailed Description
The amine flotation collector adopted in the embodiment of the invention is 3-dodecyloxy propylamine.
The iron ore in the embodiment of the invention is magnetic separation iron ore concentrate, the iron grade is 43.58%, and the mass percentage of quartz is 35.88%.
When the iron ore is floated, the iron ore is made into ore pulp with the mass concentration of 30-40% and then placed in a flotation tank for flotation, the flotation temperature is 21 +/-1 ℃, and the pH value of the ore pulp is adjusted to be 9-9.2; the flotation is divided into roughing and fine separation, and the roughing concentrate produced by the roughing is subjected to fine separation.
In the embodiment of the invention, when rough concentration is carried out, a defoaming collecting agent and an inhibitor are added, wherein the inhibitor is DLTY-1, and the using amount of the inhibitor is 250g/t iron ore; the dosage of the defoaming collector is 125g/t iron ore.
In the embodiment of the invention, when the concentration is carried out, the defoaming collecting agent is added, and the using amount is 50g/t of iron ore.
In the embodiment of the invention, the stirring speed during the flotation is 1800-2000 rpm.
In the embodiment of the invention, 1M hydrochloric acid solution and 1M sodium hydroxide solution are adopted to adjust the pH value.
The hydrochloric acid and the sodium hydroxide adopted in the embodiment of the invention are industrial-grade products.
The C8H17-Ph-O- [ CH2-CH2-O ] n-H adopted in the embodiment of the invention is a commercial product, and n is 1-100.
The short-chain mixed hydrocarbon adopted in the embodiment of the invention is a commercial product and is a mixture containing straight-chain alkane, branched-chain alkane, cyclane and aromatic hydrocarbon with 9-18C atoms.
The foam volume measuring method adopted in the embodiment of the invention comprises the following steps: attaching a scale with scales on the flotation tank, converting the scales into volumes, scraping the bubbles once every 6s after the fixed inflation amount starts to inflate in the flotation process, recording the scales corresponding to the foam height in the flotation tank before and after the bubbles are scraped, converting different scales into volumes, wherein the total time of scraping the bubbles is 6min, and after the bubbles are scraped, stopping inflating and recording the total volume of the foams generated in the total time of scraping the bubbles.
Example 1
The combined defoaming agent for the amine flotation collector consists of phenol ether derivatives, short-chain mixed hydrocarbon and polydimethylsiloxane; the molecular weight of polydimethylsiloxane is 10000;
the mass ratio of the phenol ether derivative, the short-chain mixed hydrocarbon and the polydimethylsiloxane in the combined defoaming agent for the amine flotation collector is 0.5:1: 2;
the preparation method comprises the following steps: uniformly mixing the phenol ether derivative, the short-chain mixed hydrocarbon and the polydimethylsiloxane according to the proportion;
the using method comprises the following steps:
in the process of iron ore flotation, when quartz in iron ore is captured, before an amine flotation collector is added, a combined defoaming agent for the amine flotation collector is added into the amine flotation collector and uniformly mixed, and the mixing proportion is 1:200 according to the mass ratio of the combined defoaming agent for the amine flotation collector; then collecting quartz by taking the mixed material as a defoaming collecting agent;
the handling capacity of the iron ore is 300g, the foam volume is 1300mL after rough concentration, and the foam volume is 550mL after fine concentration; performing a parallel comparison test without using a combined defoaming agent for the amine flotation collector, wherein the foam volume generated after rough concentration is 2050mL, and the foam volume generated after fine concentration is 1000 mL; the iron grade and yield of the selected concentrate after flotation are basically the same.
Example 2
The combined defoaming agent for the amine flotation collector is the same as the combined defoaming agent in the embodiment 1, and the difference is that: the molecular weight of the polydimethylsiloxane is 20000; the mass ratio of the phenol ether derivative to the short-chain mixed hydrocarbon to the polydimethylsiloxane is 0.6:1.2: 3;
the using method is different from that of the embodiment 1 in that: the mixing proportion is used for the combined defoaming agent of the amine flotation collector in a mass ratio of 1: 300;
the foam volume generated after rough concentration is 1150mL, and the foam volume generated after fine concentration is 500 mL.
Example 3
The combined defoaming agent for the amine flotation collector is the same as the combined defoaming agent in the embodiment 1, and the difference is that: molecular weight of polydimethylsiloxane 50000; the mass ratio of the phenol ether derivative to the short-chain mixed hydrocarbon to the polydimethylsiloxane is 0.8:1.4: 4;
the using method is different from that of the embodiment 1 in that: the mixing proportion is used for the combined defoaming agent of the amine flotation collector in a mass ratio of 1: 400;
the froth volume produced after roughing was 1200mL and the froth volume produced after beneficiating was 470 mL.
Claims (2)
1. A use method of a combined defoaming agent for amine flotation collectors is characterized in that the combined defoaming agent for the amine flotation collectors is composed of phenol ether derivatives, short-chain mixed hydrocarbon and polydimethylsiloxane; the molecular formula of the phenol ether derivative is C8H17-Ph-O- [ CH2-CH2-O ] n-H, wherein n = 1-100; the short-chain mixed hydrocarbon is a mixture of straight-chain alkane, branched-chain alkane, cycloalkane and aromatic hydrocarbon with 9-18C atoms; the molecular weight of the polydimethylsiloxane is 5000-100000; the preparation method comprises the steps of uniformly mixing the phenol ether derivative, the short-chain mixed hydrocarbon and the polydimethylsiloxane according to the mass ratio of (0.5-0.8) to (1-1.4) to (2-4); the using method comprises the following steps: in the process of iron ore flotation, when quartz in iron ore is captured, before an amine flotation collector is added, a combined defoaming agent for the amine flotation collector is added into the amine flotation collector and uniformly mixed, and the combined defoaming agent for the amine flotation collector is mixed according to a mixing proportion, namely the combined defoaming agent for the amine flotation collector is amine flotation collector =1 (100-400); and then collecting the quartz by taking the mixed material as a defoaming collector.
2. The use method of the combined defoaming agent for amine flotation collectors according to the claim 1 is characterized in that after the combined defoaming agent for amine flotation collectors is used in the manner, the volume ratio of the foam formed after the completion of the flotation is reduced by 1/3-1/2 compared with the volume ratio of the foam formed without the combined defoaming agent for amine flotation collectors.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115228616B (en) * | 2022-08-09 | 2024-04-19 | 东北大学 | Iron ore normal-temperature reverse flotation method without adjusting pH value |
| CN115283143A (en) * | 2022-08-09 | 2022-11-04 | 东北大学 | Defoaming agent for amine flotation collector and preparation method and application method thereof |
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