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Chelating macromolecular inhibitor for bauxite anti-flotation and its preparation method

A bauxite and reverse flotation technology, applied in flotation, solid separation, etc., can solve the problems of weak diaspore suppression ability and lack of selectivity in suppression

Inactive Publication Date: 2004-10-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the presence of collectors has good buoyancy to diaspore. The inhibitors of diaspore in bauxite reverse flotation reported in the literature are starch or tannin. The inhibitory ability of diaspore is weak, and the inhibition lacks selectivity, that is, it has inhibitory effect on aluminosilicates such as kaolinite, illite and pyrophyllite

Method used

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  • Chelating macromolecular inhibitor for bauxite anti-flotation and its preparation method
  • Chelating macromolecular inhibitor for bauxite anti-flotation and its preparation method
  • Chelating macromolecular inhibitor for bauxite anti-flotation and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a 250ml three-neck flask equipped with a stirrer, reflux condenser and dropping funnel, disperse 25g of starch in 100ml of isopropanol, add 20ml of 30% KOH solution under stirring, activate at 30°C for 30min, then add 28g Methyl chloroacetate was stirred at 40°C for 5h. Suction filter the reaction product, disperse the filter cake in 100ml of 85% ethanol, add dropwise 7g of hydroxylamine chloride and 4g of potassium hydroxide respectively dissolved in 60ml of water in advance, continue stirring and reacting at 60°C for 2h, stop heating, and wash with dilute hydrochloric acid Neutralize, filter with suction, wash the filter cake with 85% ethanol aqueous solution several times, and dry it at a constant temperature of 40°C. That is hydroxamic acid starch.

[0022] With 40 mg / l dodecylamine as collector and hydroxamic acid starch as inhibitor, the flotation test of dihydrite, kaolinite, pyrophyllite and illite minerals was carried out. The buoyancy of diaspore has obvi...

Embodiment 2

[0026] Example 2 In a 250ml three-neck flask equipped with a stirrer, a reflux condenser and a dropping funnel, 25g of starch was dispersed in 100ml of isopropanol, and 20ml of 30% NaOH solution was added under stirring, and activated at 30°C for 30min. , Add 14g of methyl chloroacetate, and stir the reaction at 40°C for 5h. Suction filter the reaction product, disperse the filter cake in 100ml of 85% ethanol, add dropwise 3.5g of hydroxylamine chloride and 4g of sodium carbonate dissolved in 30ml of water respectively in advance, continue to stir and react at 50°C for 2h, then stop heating, wash with dilute hydrochloric acid Neutralize, filter with suction, wash the filter cake several times with 85% ethanol aqueous solution, and dry at a constant temperature of 40° C. to obtain hydroxamic acid starch.

[0027] With 40 mg / l dodecylamine as collector and hydroxamic acid starch as inhibitor, the flotation test of dihydrite, kaolinite, pyrophyllite and illite minerals was carrie...

Embodiment 3

[0028] Example 3 In a 250ml three-necked bottle equipped with a stirrer, a reflux condenser and a dropping funnel, 25g of starch was dispersed in 100ml of n-butanol, and 30% Na 2 CO 3 20ml of the solution was activated at 30°C for 30min, then 18g of ethyl bromoacetate was added, and the reaction was stirred at 40°C for 5h. Suction filter the reaction product, disperse the filter cake in 100ml of 85% ethanol, add dropwise 3.5g of hydroxylamine chloride and 4g of sodium carbonate dissolved in 30ml of water respectively in advance, continue to stir and react at 40°C for 2h, then stop heating, wash with dilute hydrochloric acid Neutralize, filter with suction, wash the filter cake several times with 85% ethanol aqueous solution, and dry at a constant temperature of 40°C to obtain hydroxamic acid starch.

[0029] With 40 mg / l dodecylamine as collector and hydroxamic acid starch as inhibitor, the flotation test of dihydrite, kaolinite, pyrophyllite and illite minerals was carried o...

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Abstract

A chelate-type macro-molecular suppressor for the back floatage of bauxite is disclosed, which is a water-soluble high-molecular compound, hydroxamate starch, and is prepared from starch, alpha-haloacetate and hydroxyamine through nucleophilic substituting reaction and nucleophilic addition-remove reaction. It has high selectivity as it does not affect the aluminium silicate ores.

Description

Technical field: [0001] The present invention relates to a kind of starch, α-haloacetate and hydroxylamine as raw materials, through nucleophilic substitution reaction and nucleophilic addition-elimination reaction to prepare water-soluble macromolecule compound—hydroxamic acid starch, which has high water solubility The molecular compound is a chelating type highly selective inhibitor, which can effectively inhibit the flotation of diaspore, and is suitable as an inhibitor for reverse flotation desiliconization of diaspore type bauxite. Background technique: [0002] my country's diaspore-type bauxite reserves are abundant, with the resource characteristics of high aluminum, high silicon, and high aluminum-silicon ratio. The main gangue minerals are aluminosilicates such as kaolinite, illite, and pyrophyllite. For a long time, my country's alumina industry has adopted high-cost, high-energy-consuming sintering or mixed-linking methods to produce alumina, and the products la...

Claims

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Application Information

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IPC IPC(8): B03D1/008B03D1/016
Inventor 胡岳华蒋玉仁李海普曹学锋
Owner CENT SOUTH UNIV