Such collectors with cations from the solution to produce a hydrophobic hydrocarbon group, it is also known cationic collector, collector gold colored metal oxide ore, quartz, feldspar, mica, aluminum silicate, and potassium . RNH 2 + HC I ≒ RNH 2 · HCI RNH 2 · HCI ≒ RNH 3 + Ten CI - RNH 3 + ≒ RNH 2 + H + Pulp RNH 2 · HCI,, RNH 3 +, RNH 2 in the presence of each concentration of the slurry and pH are closely related. C 12 H 25 NH 2 å H 2 O ≒ C 12 H 25 NH 3 + + OH -      The aqueous solution is alkaline and reacts with an acid to form a salt. Its carbon chain length is generally C 10 ~ C 18 due to its poor solubility in water, it needs to be formulated into a hydrochloride or acetate solution. Laser marking encompasses a wide variety of applications in manufacturing. Laser marking can be automated and processed at high speeds while leaving permanent traceability on all kinds of materials, including steel, titanium, aluminum, copper, ceramic, plastic, glass, wood, paper and cardboard. Laser Marking Machine,Hand Engraving Machine,Jewelry Laser Engraving Machine,Deep Metal Engraving Shandong Meiman Laser Technology Co., Ltd. , https://www.meimanlasers.com
The amine is a derivative in which H in NH 3 is substituted by a hydrocarbon group, and is classified into a first (primary), a second (secondary), a third (tertiary) amine, a quaternary ammonium or the like depending on the number of hydrocarbon groups.
The amine used as the collector is mostly the first amine, and the structure of the hydrocarbon group depends on the raw materials used. At present, fatty acids ( C 10 ~ C 20 mixed fatty acids) obtained by using oxidized paraffin are used as raw materials to prepare mixed fat first amines, which are referred to as mixed amines, fatty amines, first gums and the like.
The mixed amine is a pale yellow waxy body at room temperature, has a pungent odor, is insoluble in water, and is soluble in an acidic solution or an organic solvent. When using, it can be mixed with 1 : 1 with hydrochloric acid and mixed amine , heated water, and then diluted with water to a 1 % ~ 0.1 % aqueous solution. The flotation properties of cationic collectors are related to the length of their hydrocarbon chains.
The hydrochloric acid solution of the first amine is dissociated and hydrolyzed as follows:
The amine collector molecules dissociate from the cation in water and have a hydrophobic hydrocarbon group on the cation, thus belonging to an isopolar cation collector. Commonly used cationic collectors are dodecyl first amines, which are dissociated in aqueous solution.
The cations in the formula interact with the mineral surface. In addition to its trapping properties, amine collectors also have foaming properties.
When the amine-based flotation of the non-ferrous metal oxide ore is carried out in an alkaline medium, sufficient RNH 2 is formed. The unique electron energy of the nitrogen atom in RNH 2 forms a complex with Cu 2+ , Zn 2+ , Cd 2+ , Co 2+ ions on the mineral surface to make the mineral surface hydrophobic. When the amine cation is a flotation active ingredient, the cationic RNH 3 + is an active ingredient for flotation if it is floated in a relatively acidic medium (when the mineral surface is positively charged) .
Compared with other amines, quaternary ammonium salt cation collectors are characterized by high solubility, selectivity and non-toxicity in water.
 When using amine collectors, be aware of:
( 1) The amine collector cannot be added at the same time as the anion collector. Because the ions of these two classes of agents react with each other in solution, a higher molecular weight insoluble salt is formed.
(2) The amine has a certain foaming ability and has certain adaptability to the hardness of water. However, if the hardness of water is too high, the amount of the amine needs to be increased.
(3) The amine can preferentially adhere to the slime, resulting in a decrease in selectivity. Therefore, the slime should be removed before flotation.
(4) amines and neutral oils may be mixed, such as with a cationic collector flotation of quartz and kerosene.
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