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Low-grade magnesite light roasting technology

A magnesite, low-grade technology, applied in the direction of lime production, etc., can solve the problem of inability to carry out gaseous suspension roasting or fluidized roasting

Inactive Publication Date: 2014-10-15
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of purifying magnesium by direct flotation of low-grade magnesite uses saponified fatty acid flotation agent, which has a certain viscosity and will be enriched on the magnesium concentrate after selection, making it impossible to carry out gaseous suspension roasting or flow. State roasting

Method used

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  • Low-grade magnesite light roasting technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The low-grade magnesite is crushed with a jaw crusher, ground to -200 mesh 70% by a combination of a ball mill and a classifier, firstly desiliconized by reverse flotation in a flotation cell, and then purified by positive flotation to obtain Magnesium concentrate pulp; Magnesium concentrate pulp is dehydrated by settling tank to obtain concentrate filter cake; concentrate filter cake is dried by disc dryer; dry concentrate is ground by dry ball mill to a size of ≤0.5mm The concentrated ore powder; the ground ore concentrate powder is sent to the gaseous suspension roaster for roasting to obtain light burned magnesium.

Embodiment 2

[0018] The low-grade magnesite is crushed by a cone crusher, ground to -200 mesh 70% by a combination of a ball mill and a classifier, firstly desiliconized by reverse flotation by using a flotation column, and then purified by positive flotation to obtain magnesium Concentrate pulp; Magnesium concentrate pulp is dehydrated by a horizontal belt filter to obtain a concentrate filter cake; the concentrate filter cake is dried by a box dryer; the dry concentrate is ground by a Raymond mill, and ground to ≤ 0.5mm fine ore powder; send the ground fine ore powder into a gas suspension roaster for roasting to obtain lightly burned magnesium.

Embodiment 3

[0020] The low-grade magnesite is crushed with a jaw crusher, ground to -200 mesh 68% by a combination of a ball mill and a classifier, first desiliconized by reverse flotation in a flotation tank, and then purified by positive flotation. Magnesium concentrate pulp is obtained; the magnesium concentrate pulp is dehydrated by a vertical disc filter to obtain a concentrate filter cake; the concentrate filter cake is dried by a spiral dryer; the dry concentrate is ground by a wind sweeping mill, and ground to ≤ 0.5mm concentrate powder; send the ground concentrate powder into a fluidized roaster for roasting to obtain lightly burned magnesium.

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Abstract

The invention relates to a light roasting technology of magnesite and especially relates to a low-grade magnesite light roasting technology. The technology includes following steps: (1) crushing and grinding low-grade magnesite until powder in -200 meshes accounts for 65-75%; performing a reverse-flotation desilication process and then performing a direct-flotation magnesium-extracting process to obtain magnesium concentrate ore pulp; (2) dehydrating the magnesium concentrate ore pulp to obtain concentrate filter cake; (3) drying the concentrate filter cake; (4) grinding the dried concentrate to obtain concentrate powder with particle size being not more than 0.5mm; and (5) calcining the grinded concentrate powder in a calcinator to obtain light-roasted magnesium. The technology is advantaged in that a problem that a gas-phase suspension calcinator, a fluidized flash calcinator and a cyclic calcinator, which are high-efficiently and energy-saving, are not available due to adhesion of agents in concentration of magnesite is completely solved, thereby enabling industrial production to be carried out successfully.

Description

technical field [0001] The invention relates to a process for lightly burning magnesite, in particular to a process for lightly burning low-grade magnesite. Background technique [0002] The production of sintered magnesia from magnesite in the 1930s, and the further development of fused magnesia in the 1970s and 1980s were all directly produced from raw ore. The chemical composition of raw ore determines the grade of powder, sand and products produced. Due to the development of high-temperature technology, higher and higher requirements are put forward for the grade of magnesia raw materials, especially the chemical purity. In order to meet these requirements, higher requirements for ore selection are put forward for the mining process. Fused magnesite and sintered magnesite use flotation method to process magnesite. After flotation, lower grade magnesite raw ore can be purified to meet the raw material requirements for the production of high-quality refractory materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
CPCY02P40/40
Inventor 李来时廖新勤王鹏
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE