Separation method for calcite and magnesite

A separation method, magnesite technology, applied in the field of separation, can solve the problems of large aeration volume, increase the difficulty of target minerals, poor selectivity of target minerals, etc., and achieve the effect of reducing the amount of use

Active Publication Date: 2018-06-01
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mineralization of air bubbles requires the collision of air bubbles and mineral particles. When the two approach, they break through the barrier of the hydration film, causing the hydration film to break and form two-phase contact. The difficulty of the target mineral adsorbed on the air bubbles
The generation of bubbles in conventional flotation mainly comes from the mechanical agitation of the flotation machine and external aeration, which is characterized by a large amount of aeration, but the selectivity of the bubbles to the target minerals is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The flotation of magnesite rough concentrate containing calcite (with a particle size of 0.1-1.5 mm) undergoes the following steps:

[0024] Adjust the slurry concentration of magnesite coarse concentrate to 40wt%; add dispersant water glass 300g / t, and stir for 2 minutes; then add sulfuric acid solution with a concentration of 15wt%, adjust the pH value to 1, and separate the solid and liquid after stirring for 30s; Add the separated solid to 3wt% polyvinyl alcohol aqueous solution to make the slurry concentration 30wt%, stir (1000 r / min) for 2 minutes, add sulfuric acid solution, adjust the pH value to 1, and then undergo conventional flotation to obtain Magnesite concentrate.

[0025] The grade of the obtained magnesite concentrate reached 47.5%, and the recovery rate was close to 91%. Compared with the conventional flotation results, the grade increased by about 1%, and the recovery rate increased by nearly 20%.

Embodiment 2

[0027] The flotation of magnesite coarse concentrate containing calcite (with a particle size of 1-2 mm) undergoes the following steps:

[0028] Adjust the pulp concentration of magnesite coarse concentrate to 30wt%; add dispersant water glass 300g / t, and stir for 2 minutes; then add sulfuric acid solution with a concentration of 25wt%, adjust the pH value to 2, and separate the solid and liquid after stirring for 50s; Add the separated solid to 4wt% polyvinyl alcohol aqueous solution to make the slurry concentration 20wt%, stir (1200 r / min) for 2 minutes, add sulfuric acid solution, adjust the pH value to 2, and then undergo conventional flotation to obtain Magnesite concentrate.

[0029] The grade of the obtained magnesite concentrate reached 47.6%, and the recovery rate was close to 95%. Compared with the conventional flotation results, the grade increased by about 1%, and the recovery rate increased by nearly 25%.

Embodiment 3

[0031] The flotation of magnesite rough concentrate containing calcite (with a particle size of 2 to 3 mm) undergoes the following steps:

[0032] Adjust the pulp concentration of magnesite coarse concentrate to 50wt%; add dispersant water glass 300g / t, and stir for 2 minutes; then add sulfuric acid solution with a concentration of 25wt%, adjust the pH value to 3, and separate the solid and liquid after stirring for 60s; Add the separated solids to 5wt% polyvinyl alcohol aqueous solution to make the slurry concentration 30wt%, stir (1400 r / min) for 2 minutes, add sulfuric acid solution, adjust the pH value to 4, and then undergo conventional flotation to obtain Magnesite concentrate.

[0033] The grade of the obtained magnesite concentrate reached 47.7%, and the recovery rate was close to 96%. Compared with the conventional flotation results, the grade increased by about 1%, and the recovery rate increased by nearly 25%.

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Abstract

The invention provides a separation method for calcite and magnesite. The method comprises the following steps: in allusion to a pretreatment process of the separation, firstly regulating the pulp density of magnesite rough concentrate containing the calcite to be 30-50 wt%, adding a dispersing agent, and adding sulfuric acid solution after stirring for 2 minutes, regulating a pH value to be 1-3,and performing the solid-liquid separation after stirring for 20-60 s in a low speed; adding the separated solid to 2-5 wt% of polyvinyl alcohol solution, enabling the pulp density to be 10-30 wt%, adding the sulfuric acid solution after stirring for 2 minutes, and regulating the pH value to be 1-5, to obtain magnesite concentrate after the conventional flotation. The method is capable of reducingthe dosages of a collecting agent and a foaming agent, and getting the magnesite concentrate in high purity.

Description

technical field [0001] The invention belongs to the technical field of separation, and in particular relates to a method for separating calcite and magnesite. Background technique [0002] Magnesite is one of the advantageous mineral resources in my country, with proven reserves of 3 billion tons, accounting for about 1 / 4 of the world's proven reserves, ranking first in the world. Resources are mainly concentrated in southern Liaoning, with reserves reaching 2.58 billion tons, accounting for about 86% of my country's total proven reserves. Magnesite is a magnesium carbonate mineral with great industrial value. It is widely used in metallurgy, building materials, chemical industry, light industry, agriculture and animal husbandry and metal magnesium extraction because of its high refractoriness, cohesiveness and other excellent physical and chemical properties. and other fields. Magnesite resources have unique advantages both in quantity and quality, which has laid a solid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/02
Inventor 邓荣东黄裕卿胡元左蔚然
Owner FUZHOU UNIV
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