Phosphate mineral inhibitor as well as preparation method and use thereof

Abstract

The invention discloses an N-naphthyl-alpha-amido aryl phosphonic acid, with a general molecular formula (I). The invention also discloses a preparation method and a use of the N-naphthyl-alpha-amido aryl phosphonic acid. The N-naphthyl-alpha-amido aryl phosphonic acid is prepared from 1-naphthylamine, aromatic aldehyde and phosphorous acid based on a mannich reaction at the presence of acid, wherein the molar ratio of the 1-naphthylamine, the aromatic aldehyde, the phosphorous acid and concentrated hydrochloric acid is 1:(1-1.4):(1-1.4):(0.9-1.1), reaction temperature is 100-150 DEG C, and reaction time is 1-3 hours. The N-naphthyl-alpha-amido aryl phosphonic acid disclosed by the invention has the advantages of simple synthesizing process and short reaction time, and the synthesized compound has a stronger inhibiting effect on phosphate minerals and can be used in a neutral or weakly alkaline condition.

Description

technical field [0001] The invention relates to a phosphate mineral inhibitor-N-naphthyl-α-aminoaryl phosphonic acid compound, as well as a preparation method and application of the compound. Background technique [0002] Most of the phosphate rocks in my country are medium and low-grade phosphate rocks, and dolomite and silicate are the main gangues in the phosphate rocks. In alkaline media, the flotation behavior of dolomite and collophanite is similar, making their separation very difficult. In acidic medium, the reverse flotation process shows a good separation effect, and the most effective inhibitor of reverse flotation is phosphoric acid or sulfur-phosphoric mixed acid. Although they have good selectivity to phosphorus mineral inhibition, their inhibitory ability is weak, so that their dosage is large, resulting in the following problems: (1) large dosage and high cost of reagents; (2) acidity of flotation pulp (3) It is highly corrosive to the equipment; (4) It cau...

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Problems solved by technology

Although they have good selectivity to phosphorus mineral inhibition, their inhibitory ability is weak, so that their dosage is large, resulting in the following problems: (1) large dosage and high cost of reagents; (2) acidity of flotation pulp (3) It is highly corrosive to the equipment; (4) It causes some minerals such as calcium and magnesium to dissolve, and the metal ions such as calcium and magnesium in the pulp and SO 4 2- , CO 3 2- 、PO 4 3- The content of acid radical ions is high, so that the scale of the equipment pipeline is serious, and it needs to be cleaned frequently;

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