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A kind of direct and reverse flotation process for manganese low-grade phosphate rock demanganization

A positive and negative flotation, low-grade technology, applied in flotation, solid separation, etc., can solve the problems of lower quality and production capacity, complex mosaic relationship, and affect the granulation of ammonium phosphate, so as to improve the utilization rate and overcome the The effect of technical difficulties

Inactive Publication Date: 2019-03-08
WUHAN INSTITUTE OF TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phosphate rock contains a large amount of manganese minerals, including manganese ore, pyrolusite, and rhodochrosite. When preparing ammonium phosphate fertilizer, manganese minerals will reduce the quality and productivity, and at the same time affect the granulation of ammonium phosphate.
Therefore, certain technological means must be used to reduce the content of manganese minerals in phosphorus concentrate, that is, MnO 2 However, manganese low-grade phosphate rock is characterized by complex mosaic relationship of various minerals, fine mosaic particle size, poor dissociation, and high content of gangue minerals such as silicate minerals, carbonate minerals and manganese minerals. Its development and utilization is a worldwide problem

Method used

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  • A kind of direct and reverse flotation process for manganese low-grade phosphate rock demanganization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of direct and reverse flotation process of manganese low-grade phosphate rock demanganization, its flow chart is shown in figure 1 , the manganese low-grade phosphate rock used is a manganese low-grade phosphate rock in Hubei, and its main chemical composition is:

[0033] Element type

P 2 o 5

MgO

Fe 2 o 3

Al 2 o 3

CaO

SiO 2

Na 2 o

K 2 o

MnO 2

CO 2

F

TiO 2

content / %

10.62

1.96

2.37

3.18

4.68

14.78

30.28

0.40

3.05

31.53

0.07

0.34

[0034] Specific steps are as follows:

[0035]Crush manganese low-grade phosphate rock (raw ore) to -2mm, and then use a grinder to grind the ore until the mass fraction of ore particles with a grinding fineness of -0.074mm accounts for about 68.6%, and then add water to adjust the slurry to the slurry The solid concentration in the medium is 340g / L, and then flows into the mixing tank, and sodium carbonate (3...

Embodiment 2

[0039] A manganese low-grade phosphate rock flotation process, the specific steps are as follows:

[0040] Manganese low-grade phosphate rock (raw ore, composition is the same as in Example 1) is crushed to -2 mm, and then the ore is ground by a grinder until the mass fraction of ore particles with a grinding fineness of -0.074 mm accounts for about 68%. Then add water to adjust the slurry until the solid concentration in the slurry is 340g / L, then flow into the mixing tank, add sodium carbonate (3.5kg / t relative to the amount of raw ore) and water glass (0.8kg / t relative to the amount of raw ore) into the slurry ) to adjust the pH value of the pulp to 10.0, and then add inhibitors (it is formed by mixing carbonate inhibitor NO-2 and dextrin, the ratio of NO-2 to the raw ore is 0.8kg / t, and the ratio of dextrin to the raw ore 0.8kg / t) and positive flotation collector (anionic fatty acid (soap) collector TX-1, the ratio of the dosage to the raw ore is 0.7kg / t) for pulping, the ...

Embodiment 3

[0044] A manganese low-grade phosphate rock flotation process, the specific steps are as follows:

[0045] Crush manganese low-grade phosphate rock (raw ore) to -2mm, and then use a grinder to grind the ore until the mass fraction of ore particles with a grinding fineness of -0.074mm accounts for about 68%, and then add water to adjust the slurry to the slurry The solid concentration in the medium is 340g / L, and then flows into the mixing tank, and sodium carbonate (4kg / t relative to the amount of raw ore) and water glass (0.7kg / t relative to the amount of raw ore) are added to the pulp to adjust the pH value of the pulp 10.5, then add the inhibitor (it is mixed by carbonate inhibitor NO-2 and dextrin, the ratio of NO-2 to the original ore is 0.6kg / t, and the ratio of dextrin to the original ore is 0.6kg / t) and normal The flotation collector (anionic fatty acid (soap) collector TX-1, the ratio of dosage to the raw ore is 0.8kg / t) is used for pulping, and the temperature of the...

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Abstract

The invention discloses a demanganizing direct-reverse flotation process for manganese low-grade phosphate ores. The demanganizing direct-reverse flotation process is characterized in that after manganese and magnesium low-grade phosphate ores are subjected to ore crushing and ore grinding, manganese minerals, phosphate minerals and other minerals are subjected to monomer separation, then sodium carbonate, a direct flotation inhibitor and a direct flotation collector are added, stirring is performed for size mixing, the obtained ore slurry enters the direct flotation technological process for flotation, and the obtained in-tank product is direct flotation tailings; and the obtained foam product is conveyed to the reverse flotation process, the pH is adjusted, a reverse flotation inhibitor (citric acid) and a reverse flotation demanganizing anionic collector are added, stirring is performed for size mixing, the ore slurry obtained after size mixing enters the reverse flotation technological process for further reverse flotation, the obtained foam product is reverse flotation tailings, the final in-tank product is phosphate concentrate with low contents of MnO2, MgO and SiO2, and concentration, filtering and drying are performed to obtain the end phosphate concentrate. The demanganizing direct-reverse flotation process can successfully realize mineral processing enrichment of manganese low-grade phosphate ores and improves the utilization ratio of phosphorus resources.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a forward and reverse flotation process for manganese and low-grade phosphate rock demanganization. Background technique [0002] Phosphate rock is a non-renewable basic raw material for the production of phosphate fertilizers and phosphorus chemical products. However, phosphate rock contains a large amount of manganese minerals, including manganese ore, pyrolusite, and rhodochrosite. When preparing ammonium phosphate fertilizer, manganese minerals will reduce the quality and productivity, and affect the granulation of ammonium phosphate. Therefore, certain technological means must be used to reduce the content of manganese minerals in phosphorus concentrate, that is, MnO 2 However, manganese low-grade phosphate rock is characterized by complex mosaic relationship of various minerals, fine mosaic particle size, poor dissociation, and high content of gangue minerals ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B9/00B03D1/018B03D1/008B03D1/002B03D101/06B03D101/02B03D103/06
CPCB03B9/00B03D1/002B03D1/008B03D1/018B03D2201/007B03D2201/02B03D2201/06B03D2203/06
Inventor 罗惠华唐有运张振翼刘璐许昌伦刘连坤朱道鹏舒超童亿隆
Owner WUHAN INSTITUTE OF TECHNOLOGY
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