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Method for dehydrating micro-particle slurry

A technology of fine particles and slurry, applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve problems such as poor filtration performance

Inactive Publication Date: 2010-06-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a simple and operable filter that can effectively improve the filtration capacity, reduce production costs and energy consumption, and aim at the deficiencies in the above-mentioned existing technologies such as poor filtration performance due to too fine particles. Strong dewatering method suitable for fine-grained slurries

Method used

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  • Method for dehydrating micro-particle slurry

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Effect test

Embodiment 1

[0024] A bauxite concentrate with a concentration of 10% is classified by an inclined plate thickening box with a stirring device. +10μm coarse grain concentrate with 82% content is increased to 65% by a high-efficiency thickener, and then filtered and dehydrated by a ceramic filter. 300mm, the slurry temperature is 22°C, and the filtration capacity is changed from the original 210kg / m 2 ·h increased to 442kg / m 2 ·h, filter cake moisture 11.2%. -10μm content of 86% fine particle concentrate is concentrated by high-efficiency thickener under the condition of pH = 5.6, and the concentration is increased to 44%. After the concentration is increased to 44%, it is filtered and dehydrated by a diaphragm filter press. The feeding pressure is 0.85MPa and the pressing pressure is . 1.5MPa, press filter for 8min, high pressure air pressure is 0.4-0.6MPa, backflush for 3min, moisture content of filter cake is 18.3%.

Embodiment 2

[0026] An iron ore concentrate with a concentration of 12% is classified by a secondary hydrocyclone. +10μm Coarse particle concentrate with 85% content is settled and concentrated by high-efficiency thickener. After the concentration is increased to 72%, it is filtered and dehydrated by microporous filter. The filtration time is 7-12min, the filtration pressure is 0.05-0.12MPa, and the drying air pressure is 0.1 -0.15MPa, the drying time is 15min, and the filtration capacity is increased from the original 300kg / m2·h to 590kg / m 2 ·h, filter cake moisture 8.6%. -10μm content of 90% fine-grain concentrate is concentrated by high-efficiency thickener sedimentation, and the concentration is increased to 48%. After the concentration is increased to 48%, it is filtered and dehydrated by a diaphragm filter press. The feeding pressure is 0.75MPa, the feeding time is 1.5min, and the pressing pressure is 1.2MPa. Press filtration for 6.5 minutes, high pressure air pressure is 0.4-0.6 MP...

Embodiment 3

[0028] A bauxite beneficiation concentrate with a concentration of 15% is classified under the action of a hydrocyclone. +10μm coarse-grain concentrate with 76% content is concentrated by high-efficiency thickener under the condition of pH=7.4. After the concentration is increased to 67%, it is filtered and dehydrated by vertical disc filter. The vacuum degree is 0.38MPa, and the filtration capacity is changed from the original 210kg / m 2 ·h increased to 480kg / m 2 ·h, filter cake moisture 11.6%. The fine-grained ore concentrate with a content of -10μm of 81% is concentrated by high-efficiency thickener under the condition of pH=5.4, and the concentration is increased to 53%. After the concentration is increased to 53%, it is filtered and dehydrated by a horizontal screw centrifugal dehydrator. The differential speed of the screw pusher is 15r / min, and the water content of the filter cake is 17.8%.

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Abstract

The invention relates to a method for dehydrating micro- particle slurry, in particular to a method for dehydrating the micro-particle products, which is suitable for ore-dressing practice. The method comprises the processes of grading, sedimentating and filtering. The method is characterized in that the micro-particle slurry is graded firstly in the dehydration process to obtain the particle slurry and fine particle slurry, wherein the coarse particle slurry is sedimentated via a thickening machine, and then is filtered by using a micropore material or device. After the fine particle slurry is sedimentated, a membrane chamber-type filter press or a centrifugal hydroextractor is used to dehydrate and filter. The method is easy and simple, solves the problems of low productive capacity of filtering the micro-sized particle slurry and enhances the sedimentating and filtering performance of the micro-sized particle slurry and the moisture of a filter mass so as to greatly reduce the energy consumption of metallurgy and the mineral separation cost.

Description

technical field [0001] The invention relates to a method for dehydrating fine particle slurry, in particular to a method for dehydrating fine particle products suitable for ore dressing operations. Background technique [0002] Fine-grained materials usually refer to particles with a particle size below 38 μm. Due to their fine particle size, large specific surface area, and strong hydrophilicity, dehydration and filtration are very difficult. The dehydration and filtration of fine-grained materials is a very important process in the process of mineral processing, chemical industry, building materials, water smelting and sewage treatment. The utilization of refractory ores is imminent. Due to the complex distribution of these ores, fine grinding must be carried out for comprehensive utilization, so as to achieve effective monomer dissociation. As the grinding fineness of ores gradually increases, the content of fine particles increases rapidly. Due to its fine particle siz...

Claims

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Application Information

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IPC IPC(8): B01D36/04B01D21/02
Inventor 陈湘清闫琨陈兴华张建强周杰强于延芬
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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