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Method for temperature-control flotation and decalcification of magnesite

A technology of temperature control and magnesite, which is applied in flotation, solid separation, etc., can solve problems such as the influence of temperature and surface characteristics, and achieve the effects of saving mineral processing costs, stable operation, and low grade

Inactive Publication Date: 2019-04-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, for the separation of calcium and magnesium from magnesite, most workers mainly conduct separation experiments from the perspective of regulators. However, due to the certain differences in the molecular structure of magnesite and dolomite, the temperature has a great influence on the separation of the two. Surface properties also have a large influence

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  • Method for temperature-control flotation and decalcification of magnesite

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for temperature-controlled flotation decalcification of magnesite, the flow chart of which is shown in figure 1 , including the following steps:

[0035] Step 1: Grinding

[0036] Crushing and screening high-calcium and low-grade magnesite raw materials to obtain magnesite powder with a particle size of 38-74 μm;

[0037] Step 2: Blending

[0038] Put the magnesite powder with a particle size of 38-74 μm in the hanging tank type flotation machine, add deionized water and mix evenly, and adjust the slurry to obtain magnesite slurry; wherein, the content of magnesite in the magnesite slurry is The mass concentration is 10%;

[0039] Step 3: Positive Flotation Decalcification

[0040] Set the temperature of the magnesite slurry at 5°C, first add 3% NaOH aqueous solution to the magnesite slurry, adjust the pH value to 11, and stir for 2 minutes until the slurry is uniform to obtain magnesite with a pH value of 11 pulp;

[0041] To the magnesite slurry with a ...

Embodiment 2

[0044] A method for temperature-controlled flotation decalcification of magnesite, the same as in Example 1, the difference is that the temperature of the magnesite slurry is 10°C, and the main components of the obtained low-calcium magnesite concentrate are MgO is 47.23%, SiO 2 is 0.13% and CaO is 0.59%; the MgO in the low-calcium magnesite concentrate accounts for 68.15% of the total weight of MgO in the raw material.

Embodiment 3

[0046] A method for magnesite temperature-controlled flotation decalcification, the same as embodiment 1, the difference is that the temperature of the magnesite slurry is 15°C, and the main components of the obtained low-calcium magnesite concentrate are MgO is 48.23%, SiO 2 is 0.21%, CaO is 0.47%; MgO in the low-calcium magnesite concentrate accounts for 69.25% of the total weight of MgO in the raw material.

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Abstract

The invention relates to a method for temperature-control flotation and decalcification of magnesite, and belongs to the technical field of magnesite ore dressing and purification processes. The method comprises the steps of crushing and sieving high-calcium low-grade magnesite to obtain magnesite powder with the particle size of 38-74 microns; adding deionized water for mixing and slurry blendingto obtain magnesite slurry with the mass concentration of 10-40%, wherein the temperature of the magnesite slurry is 5-20 DEG C; adding NaOH to the magnesite slurry to adjust the pH value to 10-12, firstly adding an aqueous solution of a collecting agent sodium oleate for uniform stirring, and then conducting direct flotation roughing to obtain low-calcium magnesite concentrate. By means of the method, according to the difference in floatability of magnesite and impurity minerals dolomite in magnesite at different slurry temperatures, calcium minerals in magnesite are removed, the quality ofmagnesite is improved, and a new technology is provided for ore dressing and decalcification of high-calcium low-grade magnesite.

Description

technical field [0001] The invention relates to the technical field of magnesite beneficiation and purification technology, in particular to a temperature-controlled flotation decalcification method for magnesite. Background technique [0002] China is rich in magnesite resources, but due to over-exploitation, high-grade magnesite is gradually decreasing and cannot meet production needs. However, low-grade magnesite cannot be used in the production of high-grade products, and because a large amount of low-grade magnesite cannot be effectively utilized, magnesite resources are greatly wasted, so the purification and processing of magnesite has been paid more and more attention. [0003] In the process of beneficiation and purification of magnesite, reducing the amount of CaO is the key to improving the quality of magnesite. CaO in magnesite is mainly contained in impurity mineral dolomite (CaMg(CO 3 ) 2 )middle. At present, the decalcification mechanism of magnesite flota...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/002B03B1/00B03B1/04B03D101/02B03D103/04
CPCB03B1/00B03B1/04B03D1/002B03D2201/02B03D2203/04
Inventor 印万忠孙浩然唐远杨斌付亚峰姚金
Owner NORTHEASTERN UNIV
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