Method for reverse flotation decalcification of magnesite by adopting EDDHA inhibiting agents

A magnesite and inhibitor technology, applied in the field of magnesite beneficiation and purification technology, achieves the effects of high content, shortened flotation decalcification process, and strong selective inhibition

Inactive Publication Date: 2019-08-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EDDHA (N,N'-ethylbis(2-[2-hydroxyphenyl]glycine)) is a chelating agent with strong magnesium selectivity, and is currently mainly used in the indu

Method used

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  • Method for reverse flotation decalcification of magnesite by adopting EDDHA inhibiting agents
  • Method for reverse flotation decalcification of magnesite by adopting EDDHA inhibiting agents
  • Method for reverse flotation decalcification of magnesite by adopting EDDHA inhibiting agents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of method that adopts EDDHA inhibitor to carry out the method for decalcification of magnesite reverse flotation, its flow chart is shown in figure 1 , including the following steps:

[0041] Step 1: Grinding

[0042] The raw material of high-calcium and low-grade magnesite is crushed and ball-milled to obtain magnesite powder; wherein, in the magnesite powder, the mass of magnesite powder with a particle size of less than 74 μm accounts for 65% of the total mass of magnesite powder;

[0043] Step 2: Blending

[0044] Put the magnesite powder with a particle size of less than 74 μm and accounting for 65% of the total magnesite powder mass in a hanging tank flotation machine, add deionized water and EDDHA inhibitor, wherein, according to the solid-to-liquid ratio, the EDDHA inhibitor : magnesite pulp=60mg: 1L, and mix evenly, adjust slurry to obtain magnesite pulp; wherein, the mass concentration of magnesite in the magnesite pulp is 10%;

[0045] Step 3: Rever...

Embodiment 2

[0055] A kind of method that adopts EDDHA inhibitor to carry out the method for decalcification of magnesite reverse flotation, its flow chart is shown in figure 1 , including the following steps:

[0056] Step 1: Grinding

[0057] The raw material of high-calcium and low-grade magnesite is crushed and ball-milled to obtain magnesite powder; among them, magnesite powder with a particle size of less than 74 μm accounts for 75% of the total magnesite powder;

[0058] Step 2: Blending

[0059] Put the magnesite powder with a particle size of less than 74 μm and accounting for 75% of the total magnesite powder in the hanging tank type flotation machine, add deionized water and EDDHA inhibitor, wherein, according to the solid-to-liquid ratio, the EDDHA inhibitor : magnesite pulp=70mg: 1L, and mix evenly, adjust slurry, obtain magnesite pulp; wherein, the mass concentration of magnesite in the magnesite pulp is 15%;

[0060] Step 3: Reverse Flotation Decalcification

[0061] At ...

Embodiment 3

[0065] A kind of method that adopts EDDHA inhibitor to carry out the method for decalcification of magnesite reverse flotation, its flow chart is shown in figure 1 , including the following steps:

[0066] Step 1: Grinding

[0067] The raw material of high-calcium and low-grade magnesite is crushed and ball-milled to obtain magnesite powder; among them, magnesite powder with a particle size of less than 74 μm accounts for 85% of the total magnesite powder;

[0068] Step 2: Blending

[0069] Put the magnesite powder with a particle size of less than 74 μm and accounting for 85% of the total magnesite powder in the hanging tank type flotation machine, add deionized water and EDDHA inhibitor, wherein, according to the solid-to-liquid ratio, the EDDHA inhibitor : magnesite pulp=80mg: 1L, and mix evenly, adjust slurry, obtain magnesite pulp; wherein, the mass concentration of magnesite in the magnesite pulp is 20%;

[0070] Step 3: Reverse Flotation Decalcification

[0071] At ...

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Abstract

The invention discloses a method for reverse flotation decalcification of magnesite by adopting EDDHA inhibiting agents, and belongs to the field of magnesite beneficiation and purification processes.In the method, low-grade high-calcium magnesite is crushed for ball milling; then, water and the EDDHA inhibiting agents are fed for pulping; the solid-liquid ratio of the EDDHA inhibiting agents tothe magnesite pulp is (60-90) mg: 1 L; and the mass concentration of the magnesite pulp is 10-30%. The pH value of the magnesite pulp is 10-12; sodium oleate is fed for reverse flotation and roughingdecalcification to obtain low-calcium magnesite concentrates; the recovery rate is 70-85%; and the recovery rate of MgO in the low-calcium magnesite concentrates is 65-85%. According to the floatability difference between the magnesite and impurity ores-dolomite in the magnesite under the effect of the EDDHA inhibiting agents, calcium ores in the magnesite are removed through the reverse flotationmethod, so that the quality of the magnesite is improved, and new agents are provided for beneficiation decalcification of the low-grade high-calcium magnesite.

Description

technical field [0001] The invention relates to the technical field of magnesite beneficiation and purification technology, in particular to a method for reverse flotation decalcification of magnesite by using an EDDHA inhibitor. Background technique [0002] In the beneficiation and purification process of magnesite, reducing the CaO content is the key to improving the quality of magnesite. CaO in magnesite is mainly contained in impurity mineral dolomite (CaMg(CO 3 ) 2 )middle. However, since dolomite and magnesite both belong to carbonate minerals, they have the same molecular structure and similar chemical properties, and the physical and chemical properties of calcium and magnesium ions are similar, resulting in the convergence of magnesite and dolomite surface properties, increasing the flotation process. difficulty of separation. At present, for the separation of magnesite and dolomite, the flotation method of magnesite flotation and decalcification is mostly achi...

Claims

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Application Information

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IPC IPC(8): B03B9/00B03D1/00B03D1/01B03D101/06B03D103/04
CPCB03B9/00B03D1/00B03D1/01B03D2201/06B03D2203/04
Inventor 孙浩然印万忠唐远杨斌韩会丽姚金
Owner NORTHEASTERN UNIV
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