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Synergistic inhibition of egta and shmp for decalcification of magnesite flotation

A technology of synergistic inhibition and magnesite, applied in flotation, solid separation and other directions, can solve the problems of increasing the difficulty of flotation separation and low magnesite recovery rate, and achieves improved flotation recovery rate, reduced inhibition, and low grade. Effect

Inactive Publication Date: 2020-08-18
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main inhibitor for magnesite decalcification is sodium hexametaphosphate. Sodium hexametaphosphate has little inhibitory effect on magnesite single mineral, and has a greater inhibitory effect on dolomite single mineral. The dissolution of medium magnesite and dolomite minerals leads to the dissolution of a large amount of magnesium and calcium ions into the pulp, and the physical and chemical properties of calcium and magnesium ions are similar, resulting in the adsorption of calcium ions in the solution to the surface of magnesite, which promotes the formation of magnesite and dolomite. The surface properties of the magnesite are similar, so that the magnesite is also inhibited by sodium hexametaphosphate, resulting in a low recovery rate of magnesite and increasing the difficulty of flotation separation

Method used

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  • Synergistic inhibition of egta and shmp for decalcification of magnesite flotation
  • Synergistic inhibition of egta and shmp for decalcification of magnesite flotation

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A method for synergistic suppression of EGTA and SHMP for magnesite flotation decalcification, the schematic diagram of the process flow is shown in figure 1 , including the following steps:

[0041] Step 1: Grinding

[0042] The high-calcium and low-grade magnesite raw materials are crushed and ball milled to obtain magnesite powder; among them, in the magnesite powder, the mass of magnesite powder with a particle size of less than 74 μm accounts for 75% of the total mass of magnesite powder ;

[0043] Step 2: Blending

[0044] (1) NaOH is added to deionized water to obtain deionized water with a pH value of 10, which is prepared with deionized water with a pH value of 10 to obtain a mass concentration of 0.5 g / L;

[0045](2) Place the magnesite powder whose particle size is less than 74 μm and accounts for 75% of the total magnesite powder mass in the hanging tank type flotation machine, add deionized water and inhibitor EGTA solution, wherein, according to solid-l...

Embodiment 2

[0051] A method for synergistic suppression of EGTA and SHMP for magnesite flotation decalcification, the schematic diagram of the process flow is shown in figure 1 , including the following steps:

[0052] Step 1: Grinding

[0053] The high-calcium and low-grade magnesite raw materials are crushed and ball milled to obtain magnesite powder; among them, in the magnesite powder, the mass of magnesite powder with a particle size of less than 74 μm accounts for 80% of the total mass of magnesite powder ;

[0054] Step 2: Blending

[0055] (1) NaOH is added to deionized water to obtain deionized water with a pH value of 11, which is prepared with deionized water with a pH value of 11 to obtain a mass concentration of 1 g / L;

[0056] (2) Place the magnesite powder whose particle size is less than 74 μm and account for 80% of the total magnesite powder mass in the hanging tank type flotation machine, add deionized water and inhibitor EGTA solution, wherein, according to solid-liq...

Embodiment 3

[0062] A method for synergistic suppression of EGTA and SHMP for magnesite flotation decalcification, the schematic diagram of the process flow is shown in figure 1 , including the following steps:

[0063] Step 1: Grinding

[0064] The high-calcium and low-grade magnesite raw materials are crushed and ball milled to obtain magnesite powder; among them, the mass of magnesite powder with a particle size of less than 74 μm accounts for 85% of the total mass of magnesite powder ;

[0065] Step 2: Blending

[0066] (1) NaOH is added to deionized water to obtain deionized water with a pH value of 12, which is prepared with deionized water with a pH value of 12 to obtain a mass concentration of 1 g / L;

[0067] (2) Place the magnesite powder whose particle size is less than 74 μm and account for 85% of the total magnesite powder mass in the hanging tank type flotation machine, add deionized water and inhibitor EGTA solution, wherein, according to solid-liquid Ratio, inhibitor EGT...

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Abstract

A method for synergistic suppression of EGTA and SHMP for flotation decalcification of magnesite, belonging to the technical field of magnesite beneficiation and purification technology. The method includes grinding, pulping, roughing and decalcification by positive flotation; in the pulping, the inhibitor EGTA solution is added to the magnesite pulp to adjust the pulp; and roughing and decalcification by positive flotation. In the process, the inhibitor SHMP is added to the magnesite slurry to adjust the pH value to 10 to 12, and a collector and foaming agent are added to perform positive flotation roughing and decalcification. This method utilizes the difference in floatability of magnesite and dolomite, an impurity mineral in magnesite, under the synergistic action of EGTA and SHMP to remove calcium minerals from magnesite and improve the quality of magnesite.

Description

technical field [0001] The invention relates to the technical field of magnesite beneficiation and purification technology, in particular to a method for synergistic suppression of EGTA and SHMP for magnesite flotation decalcification. 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. At present, the main inhibitor for magnesite decalcification is sodium hexametaphosphate. Sodium hexametaphosphate has little inhibitory effect on magnesite single mineral, and has a greater inhibitory effect on dolomite single mineral. The dissolution of medium magnesite and dolomite minerals leads to the dissolution of a large amount of magnesium and calcium ions into the pulp, and the physical and chemical properties of calcium and magnesium ions are similar, resulting in the adsorption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/018B03B1/00B03B1/04B03D1/002B03D101/02B03D101/06B03D103/04
CPCB03B1/00B03B1/04B03D1/002B03D1/018
Inventor 孙浩然印万忠唐远杨斌韩会丽姚金
Owner NORTHEASTERN UNIV LIAONING