Method for preparing inhibitor for arsenic-containing ores

Abstract

The invention provides a method for preparing an inhibitor for arsenic-containing ores. The method comprises the following steps of: according to the mass ratio of tannin to ethanol of 1-1.5:1.5-3, adding the tannin in a three-neck bottle, adding 95 percent ethanol in the three-neck bottle, placing the three-neck bottle in a thermostatic waterbath at the temperature of 45 DEG C, dispersing the mixing solution for 2 to 3h by stirring, adding 0.4 to 0.6 g / mL NaOH solution for alkalization according to the molar ratio of the NaOH to the hydroxyl group in the tannin of 1.5-3:1-1.5, heating the mixed solution up to the temperature of between 50 and 60 DEG C for full reaction for 1 to 2h, adding chloroactic acid in the three-neck bottle according to the molar ratio of the chloroactic acid to the hydroxyl group in the tannin of 2-3:1-6, heating the mixed solution up to the temperature of between 75 and 85 DEG C for reflux reaction for 4 to 6h, and drying the mixed solution by vaporization toobtain a solid product, namely the inhibitor for arsenic ores. The inhibitor provided by the invention can better inhibit the arsenic-containing ores during the antimony-arsenic separation, and lowerthe arsenic content in the antimony concentrate; moreover, the method also has the advantages of less consumption of the inhibitor, good solubility, no toxicity and no pollution.

Description

1. Technical field [0001] The invention relates to an inhibitor of arsenic-containing minerals, especially for the separation of antimony and arsenic, which needs to reduce the content of arsenic in antimony concentrate. 2. Background technology [0002] In the flotation of antimony ore, arsenopyrite minerals are often associated with it, which leads to excessive arsenic content in antimony concentrate. Inhibitors for arsenic-containing minerals are generally strong oxidants, such as hydrogen peroxide, potassium permanganate, bleaching powder, etc., but because antimony has poor buoyancy, and after being oxidized by strong oxidants, the buoyancy becomes poor, so strong oxidants are used. Separation of antimony and arsenic by oxidant will lead to a decrease in the recovery rate of antimony. The use of reducing agents can avoid the oxidation of antimony. Among them, sodium sulfite is the most widely used inhibitor in industry. In production, due to the effect of flotation aer...

AI Technical Summary

Problems solved by technology

[0002] In the flotation of antimony ore, arsenopyrite minerals are often associated with it, resulting in excessive arsenic content in antimony concentrate

Inhibitors for arsenic-containing minerals are generally strong oxidants, such as hydrogen peroxide, potassium permanganate, bleaching powder, etc., but because antimony has poor buoyancy, and after being oxidized by strong oxidants, the buoyancy becomes poor, so strong oxidants are used. Separation of antimony and arsenic by oxidant will lead to a decrease in the recovery rate of antimony

The use of reducing agents can avoid the oxidation of antimony, among which sodium sulfite is the most widely used inhibitor in industry. In production, due to the effect of flotation aeration, it is easy to cause partial failure of sodium sulfite, thus affecting the flotation effect

In addition, many chemicals need to be effective at a certain alkalinity, and antimony sulfide is sensitive to lime. If sodium hydroxide, sodium carbonate, etc. are used to adjust the alkalinity of the pulp, the production cost will be virtually increased. Therefore, in production, it is generally at natural alkalinity. Lower flotation, which also makes the flotation separation of antimony and arsenic more difficult