Preparation and application of copper-molybdenum separation inhibitor

Abstract

The invention relates to preparation and application of a copper-molybdenum separation inhibitor. The preparation method of the inhibitor comprises the following steps that under a catalytic stirringcondition, the reaction of mercaptoacetic acid with monoethanolamine is carried out at the temperature of 90-100 DEG C, the reaction time is 4-5 hours, and the copper-molybdenum separation inhibitor,specially, N-(2-hydroxyethyl)-2-mercaptoacetamide which is subjected to dehydration condensation kneading is obtained; the application of the prepared copper-molybdenum separation inhibitor is characterized in that the copper-molybdenum separation inhibitor is applied to flotation separation of copper-molybdenum mixed concentrate, the N-(2-hydroxyethyl)-2-mercaptoacetamide is prepared, and strongparent-mine polar group (-SH) and hydrophilic polar group (-OH and -CONH) are provided, so that the copper ore can be effectively inhibited, and the copper and molybdenum separation is achieved; the inhibitor is simple in preparation method, remarkable in inhibition effect, less in use amount, free of pungent smell, stable in property, safety in addition and convenient to use; and the N-(2-hydroxyethyl)-2-mercaptoacetamide is matched with sodium sulfide to use so that the synergistic effect can be brought into full play, the copper-molybdenum separation precision is improved, and the method isparticularly suitable for flotation separation application of molybdenite and copper sulfide ore in the copper-molybdenum mixed concentrate.

Description

technical field [0001] The invention relates to the preparation and application of a copper-molybdenum separation inhibitor, which is particularly suitable for the flotation separation application of molybdenite and copper sulfide minerals in copper-molybdenum mixed concentrate. Background technique [0002] The commonly used method for the separation of copper and molybdenum is to suppress copper and float molybdenum. The commonly used copper inhibitors mainly include sulfides (sodium sulfide, sodium hydrosulfide, ammonium sulfide, etc.), cyanides (sodium cyanide, potassium cyanide, calcium cyanide, zinc cyanide), Nokes reagent and sodium thioglycolate. Hydrolysis of sodium sulfide produces HS － , to expel the collector adsorbed on the mineral surface, and at the same time adsorb itself on the mineral surface, increase the hydrophilicity of the mineral and inhibit the copper sulfide ore. It is the most commonly used copper-molybdenum separation inhibitor, but its dosage ne...

AI Technical Summary

Problems solved by technology

Knox reagent is a non-molybdenum sulfide inhibitor developed by Knox et al. in the 1950s. It desorbs the collector on the mineral surface and simultaneously generates hydrophilic and insoluble thiophosphocopper on the mineral surface. Or copper thioarsenate, which inhibits copper sulfide minerals, but the phosphorus, arsenic and other elements contained in it will pollute the concentrate, and there are also disadvantages such as difficult to control foam and pollute the environment.

Sodium thioglycolate contains -HS group and -COONa group, in which -HS group can be adsorbed on the surface of chalcopyrite, resulting in the weakening of the hydrophobicity of the copper mineral surface, while -COONa shows hydrophilicity to form a hydrophilic film , these two groups work together to inhibit copper sulfide, but sodium thioglycolate has a strong pungent odor, which brings new requirements to the operation and production workshop environment

[0003] In terms of synthesis of new agents, Chinese patent CN 201510955462.3 discloses "Preparation and application of a copper sulfide molybdenum mixed concentrate flotation separation inhibitor". Sugar, to inhibit copper sulfide minerals, safe and environmentally friendly to use, but there are deficiencies such as expensive chitosan as a raw material and high production costs, so it has no commercial application value

Chinese patent CN 201610025302.3 discloses "a preparation method and application of non-molybdenum sulfide mineral flotation inhibitor". It is inhibitory to copper sulfide minerals, and the synthesis process is simple, but the inhibitor is a high-molecular dithiocarbonate compound, which is unstable in nature, and it is easy to hydrolyze and volatilize CS during use. 2 Toxic gas and other deficiencies are not conducive to use

[0004] Invention patent CN 201610025302.3 discloses "a preparation method and application of non-molybdenum sulfide ore flotation inhibitor", which is a compound formed by compounding sulfide salt, carbon disulfide and water-soluble polymer under stirring conditions. It is inhibitory and the synthesis process is simple, but it is a polymer dithiocarbonate compound with unstable properties, easy to hydrolyze and volatilize CS 2 Toxic gas, not conducive to use

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