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A kind of flotation process of manganese and magnesium low-grade phosphate rock

A low-grade, magnesium-based technology, applied in flotation, solid separation, etc., can solve the problems of reducing quality and productivity, affecting the granulation of ammonium phosphate, poor dissociation, etc., and achieve the effect of improving utilization rate

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, it is necessary to reduce the content of manganese minerals (MnO 2 content), and manganese-magnesium low-grade phosphate rock has complex mosaic relationship of various minerals, fine particle size of mosaic distribution, poor dissociation, and high content of gangue minerals such as silicate minerals, carbonate minerals and manganese minerals characteristics, its development and utilization is a worldwide problem

Method used

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  • A kind of flotation process of manganese and magnesium low-grade phosphate rock

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] A kind of flotation process of manganese and magnesium low-grade phosphate rock, its process flow is shown in figure 1 , the manganese and magnesium low-grade phosphate rock used is a manganese low-grade phosphate rock in Hubei, and its main chemical composition is:

[0023]

[0024] Specific steps are as follows:

[0025] Manganese-magnesium low-grade phosphate rock is crushed to -2mm, and then grinded with a grinding machine until the mass fraction of ore particles with a grinding fineness of -0.074mm accounts for about 68%, so that phosphorus minerals and gangue Minerals, including manganese minerals, carbonate minerals and other monomers, are dissociated, and water is added to adjust the slurry until the solid concentration in the slurry is 34g / L, and then flow into the mixing tank, and a pH regulator (which is composed of sodium carbonate and sodium hydroxide) is added to the slurry. It is mixed with a mass ratio of 3:1, the dosage is 6.0kg / t relative to the ra...

Embodiment 2

[0028] A kind of flotation process of manganese and magnesium low-grade phosphate rock, the specific steps are as follows:

[0029] Manganese and magnesium low-grade phosphate rock is crushed and ground (same as in Example 1), so that phosphorus minerals and gangue minerals, including manganese minerals and carbonate minerals, are dissociated, and water is added to make slurry until solid The concentration is 34g / L, and then it flows into the mixing tank, and a pH regulator is added to the pulp (it is made of sodium carbonate and sodium hydroxide mixed at a mass ratio of 3:1, and the dosage relative to the raw ore is 5.0kg / t) and water glass (the ratio of the amount to the raw ore is 0.8kg / t), adjust the pH value of the slurry to 11.6, and then add the inhibitor (it is mixed by the mass ratio of carbonate inhibitor NO-2 and dextrin at a ratio of 1:1 Formed, the ratio of the amount relative to the raw ore is 1.2kg / t) and the positive flotation collector (anionic fatty acid (soa...

Embodiment 3

[0031] A kind of flotation process of manganese and magnesium low-grade phosphate rock, the specific steps are as follows:

[0032] Manganese and magnesium low-grade phosphate rock is crushed and ground (same as in Example 1), so that phosphorus minerals and gangue minerals, including manganese minerals and carbonate minerals, are dissociated, and water is added to make slurry until solid The concentration is 34g / L, and then it flows into the mixing tank, and a pH regulator is added to the slurry (it is composed of sodium carbonate and sodium hydroxide mixed at a mass ratio of 3:1, and the dosage relative to the raw ore is 7.0kg / t) and water glass (the ratio of the amount to the raw ore is 0.8kg / t), adjust the pH value of the slurry to 11.8, and then add the inhibitor (it is mixed by the mass ratio of carbonate inhibitor NO-2 and dextrin at 1:1 Formed, the ratio of the amount relative to the raw ore is 1.6kg / t) and the positive flotation collector (anionic fatty acid (soap) co...

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Abstract

The invention discloses a manganese-magnesium low-grade phosphate flotation process. The process comprises the steps that firstly, manganese-magnesium low-grade phosphate ores are crushed and ground to enable manganese-magnesium minerals, phosphate minerals and other minerals to be subjected to monomer separation; secondly, a pH modifier is added into ore pulp to enable the pH value of the ore pulp to be greater than or equal to 11.6; and thirdly, an inhibitor and an obverse floatation collecting agent are added, and floatation is carried out after stirring and pulp conditioning. The adopted floatation process is a technological process including the rough concentration step, the concentration step and the scavenging step. Obtained ingroove products are flotation tailings. Obtained foam products are finished phosphate concentrate products with low MnO2 content, low MgO content and low SiO2 content, and the finished phosphate concentrate products are obtained finally through concentration, filtration and drying. According to the process, floatation is carried out directly under the alkali condition, dextrin and NO-2 are used in cooperation to reduce the content of silicate minerals, carbonate minerals and manganese minerals so as to obtain low-magnesium, low-manganese and low-silicon phosphate concentrates, so that mineral processing and enrichment of magnesium low-grade phosphate ores are realized successfully, and the utilization rate of phosphorus resources is increased.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a flotation process of manganese and magnesium low-grade phosphate rock. 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, it is necessary to reduce the content of manganese minerals (MnO 2 content), and manganese-magnesium low-grade phosphate rock has complex mosaic relationship of various minerals, fine particle size, poor dissociation, and high content of gangue minerals such as silicate minerals, carbonate minerals and manganese minerals Its development and utili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/018B03D1/02B03D1/08B03D1/00B03D101/02B03D101/06B03D103/06
CPCB03D1/00B03D1/018B03D1/021B03D1/08B03D2201/007B03D2201/02B03D2201/06B03D2203/06
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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