Method for enhancing hydrophobic agglomeration of suspended clay mineral-fine-grained kaolinite in water body

A clay mineral and kaolinite technology, applied in the fields of metallurgy, beneficiation and environmental treatment, can solve the problems that the settlement effect cannot reach industrial application, the hydrophobicity is not strong enough, the hydrophobic agglomeration strength is not strong enough, etc., and the agglomeration and settlement effect is remarkable. , the effect of fast settling speed and large floc size

Inactive Publication Date: 2020-09-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrophobicity of kaolinite particles modified by a single surfactant is still not strong enough, and the hydrophobic aggregation strength that can be produced is not strong enough, resulting in the aggregate size of fine-grained kaolinite, and the sedimentation effect is still not up to industrial applications. requirements

Method used

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  • Method for enhancing hydrophobic agglomeration of suspended clay mineral-fine-grained kaolinite in water body

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The clay mineral-kaolinite is dispersed into a suspension with tap water, and the mass percentage of the solid in the suspension is 5wt%. In the described clay mineral-kaolinite, about 90% of the kaolinite also contains a small amount of iron, titanium, Magnesium and calcium oxides and a small amount of organic matter; the particle size of kaolinite clay samples is <20 μm, of which 81% are smaller than 10 μm, and 15% are smaller than 2 μm.

[0026] (2) add valeric acid-KOH solution in the suspension that step (1) obtains by the ratio of 700g / t of valeric acid input concentration, then add KOH solution to adjust the pH of suspension to be 5.8, stir 10min under normal temperature, to The short-chain hydrophobization modification was carried out on the specific area of ​​kaolinite surface.

[0027] (3) add the hydrochloric acid solution of dodecylamine (DDA) in the suspension that step (2) obtains in the ratio of 200g / t by dodecylamine (DDA) input concentration, keep t...

Embodiment 2

[0030] (1) Clay mineral-kaolinite is dispersed into a suspension with tap water, and the mass percentage of solid in the suspension is 10wt%. In the described clay mineral-kaolinite, about 90% of kaolinite also contains a small amount of iron, titanium, Magnesium and calcium oxides and a small amount of organic matter; the particle size of kaolinite clay samples is <20 μm, of which 81% are smaller than 10 μm, and 15% are smaller than 2 μm.

[0031] (2) put octanoic acid-NaOH solution in the suspension that step (1) obtains in the ratio of 700g / t by octanoic acid concentration, then add NaOH solution to adjust the pH of suspension to be 5.8, stir 10min under normal temperature, to kaolin Short-chain hydrophobization modification of specific regions on the stone surface.

[0032] (3) Add an acetic acid solution of dodecylamine (DDA) to the suspension obtained in step (2) at a ratio of 260g / t to keep the acidity of the suspension constant, and continue to stir for 10min to obtain...

Embodiment 3

[0035] (1) The clay mineral-kaolinite is dispersed into a suspension with tap water, and the mass percentage of solids in the suspension is 0.2wt%. In the described clay mineral-kaolinite, about 90% of the kaolinite also contains a small amount of iron and titanium , magnesium and calcium oxides and a small amount of organic matter; the particle size of kaolinite clay samples is less than 20 μm, of which the particle size is less than 10 μm, accounting for about 81%, and the particle size is less than 2 μm, accounting for 15%.

[0036](2) drop nonanoic acid-NaOH solution in the suspension that step (1) obtains by the ratio of 70g / t feeding concentration of nonanoic acid, then add NaOH solution to adjust the pH of suspension to be 5.5, stir 10min under normal temperature, to The short-chain hydrophobization modification was carried out on the specific area of ​​kaolinite surface.

[0037] (3) add the acetic acid solution of dodecylamine (DDA) in the suspension that step (2) obt...

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Abstract

The invention discloses a method for enhancing hydrophobic agglomeration of suspended clay minerals-fine-grained kaolinite in a water body, and belongs to the technical field of beneficiation environment treatment. The method disclosed by the invention comprises the following steps: adding a hydrophobic agglomeration strengthening reagent into a suspension according to a proportion of 60 -1000 g/t, controlling the pH value of the suspension to be 4-6, and stirring the suspension for 5-10 minutes at normal temperature; then adding a dodecylamine solution into the suspension according to the proportion of 100-300 g/t, keeping the pH of the suspension at 4-6, and continuously stirring the suspension for 5-10 minutes; and standing the suspension for quickly settling the kaolinite particles, and carrying out solid-liquid separation. The method is used for promoting agglomeration and accelerated sedimentation of fine-grained kaolinite (20 microns) in mineral separation and metallurgy tailingwater, and can enable the Stokes equivalent particle size of the fine-grained kaolinite aggregate in the suspension to reach 86 microns or above, the sedimentation speed to reach 22.9 m/h and the sedimentation rate to reach 95%.

Description

technical field [0001] The invention relates to a method for enhancing the hydrophobic aggregation of suspended clay minerals-fine-grained kaolinite in a water body, and belongs to the technical fields of ore dressing, metallurgy and environmental treatment. Background technique [0002] In the mineral processing industry, with the increasing demand for minerals, coupled with the continuous consumption and depletion of high-grade mineral deposits, complex, fine, disseminated low-grade ores have become the main resources. To realize the dissociation of target minerals, the conventional mineral processing and hydrometallurgical processes are used for recovery, and the grinding and classification of submicron ores is inevitable. The useless fine-grained gangue produced by fine grinding reduces the grinding efficiency during the crushing process, requiring the mill to be operated at a lower density; become difficult; they also limit leach percolation, resulting in lower recover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F1/54C02F1/66C02F2103/10
Inventor 杨朋字富庭胡显智成会玲陈云龙秦雪聪陈树梁
Owner KUNMING UNIV OF SCI & TECH
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