Method for preparing inhibitor for arsenic-containing ores

An inhibitor and mineral technology, applied in solid separation, flotation, etc., can solve the problems of poor floatability, sodium sulfite failure, antimony recovery rate decline, etc., to achieve reduced arsenic content, good inhibitory effect, and less dosage of chemicals Effect

Inactive Publication Date: 2009-12-09
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 so

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] This embodiment is a preparation method of arsenic-containing mineral inhibitor, comprising the following steps:

[0013] According to the mass ratio of tannic acid and ethanol as 1:1.5, firstly take tannic acid in a three-necked bottle, then add 95% ethanol, in a constant temperature water bath at 45°C, stir and disperse for 2 hours, then add 0.4g / mL NaOH solution to alkalize, The molar ratio of NaOH to the hydroxyl group in tannic acid is 1.5:1, heat up to 50°C and allow it to fully react for 1 hour, then add chloroacetic acid and heat up to 75°C under reflux reaction according to the molar ratio of chloroacetic acid to hydroxyl group in tannic acid is 2:1 After 4 hours, the water was evaporated to dryness to obtain a solid product which was the arsenic mineral inhibitor.

Embodiment 2

[0015] This embodiment is a preparation method of arsenic-containing mineral inhibitor, comprising the following steps:

[0016] According to the mass ratio of tannic acid and ethanol as 1:2, firstly take tannic acid in a three-necked bottle, then add 95% ethanol, in a constant temperature water bath at 45°C, stir and disperse for 3 hours, then add 0.6g / mL NaOH solution to alkalize, The molar ratio of NaOH to the hydroxyl group in tannic acid is 2:1, heat up to 60°C and allow it to fully react for 2 hours, then add chloroacetic acid according to the molar ratio of chloroacetic acid to the hydroxyl group in tannic acid of 1:2, and heat up to 85°C for reflux reaction After 6 hours, the solid product obtained by evaporating the water to dryness is the arsenic mineral inhibitor.

Embodiment 3

[0018] This example is an application example of the arsenic mineral inhibitor prepared in Example 1.

[0019] 1. Mineral raw materials

[0020] The antimony content in the raw ore is 3.23%, and the arsenic content is 3.82%. A small amount of realgar, orpiment and other arsenic-containing sulfide minerals.

[0021] 2. Pharmaceutical system and operating conditions

[0022] During the flotation operation, under the condition of not adjusting the pH value of the ore pulp, the dosage of the inhibitor 120g / t, lead nitrate 200g / t, butyl xanthate 150g / t, and No. 2 oil 70g / t were used to carry out 200t / d Industrial production, the results show that the use of the above process and chemical conditions can effectively reduce the content of arsenic in antimony concentrate. Under the condition that the grade of antimony is 3.23% and the content of arsenic is 3.82%. Selected and flotation concentrates can reach 48.89% antimony grade and 0.57% arsenic content.

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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...

Claims

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Application Information

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IPC IPC(8): B03D1/018B03D101/06B03D103/02
Inventor 陈建华魏宗武穆枭兰丽红陈晔
Owner GUANGXI UNIV
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