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Method for comprehensively utilizing reverse-flotation phosphorite tailings

A phosphate mine tailings and reverse flotation technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of secondary pollution, consumption of large water resources, and ineffective utilization, achieving mild conditions and solving problems. The effect of occupying land resources and low cost

Inactive Publication Date: 2014-02-12
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods can only separate the phosphorus in the phosphorus tailings. Minerals such as calcium, magnesium, and silicon are not effectively used in the digestion waste liquid, which will cause secondary pollution, and this method consumes a lot of water resources.
[0004] At present, there is no relevant report on the comprehensive utilization of reverse flotation phosphate rock tailings

Method used

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  • Method for comprehensively utilizing reverse-flotation phosphorite tailings
  • Method for comprehensively utilizing reverse-flotation phosphorite tailings
  • Method for comprehensively utilizing reverse-flotation phosphorite tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] refer to figure 1 The process flow chart of the above-mentioned reverse flotation phosphate rock tailings is selected. In view of the above-mentioned characteristics of the reverse flotation phosphate rock tailings, the slurry containing the reverse flotation phosphate rock tailings is first formed into a mud cake by means of suction filtration or pressure filtration. , and then the mud cake is dried, and various known drying methods are available. In this embodiment, the mud cake after pressure filtration is selected to be dried at 105 ° C until the moisture content is lower than 2%. After drying, the dried Phosphorus tailings are calcined, the calcining temperature is 800°C, and the calcining time is 1 hour. Of course, it is not necessary to dry the back-selected phosphate rock tailings by adopting a method such as a wet rotary kiln for calcination. The calcination process is mainly for the decomposition of dolomite in phosphorus tailings, so the calcination temperat...

Embodiment 2

[0032] This example is basically the same as Example 1, except that the calcination temperature is 900°C.

[0033] In order to verify the effectiveness of this method, we tested the graded materials through X-ray diffraction (XRD) analysis, figure 2 The spectrum corresponding to "900, 1h" °C in the middle is the X-ray diffraction spectrum of the phosphorus-rich product in this example, and the apatite is converted into P 2 o 5 , P 2 o 5 Accounting for 30.15% of the total mass of phosphorus-rich products; image 3 The map corresponding to "900, 1h" °C in the middle is the X-ray diffraction pattern of the calcium-magnesium-rich product in this example, and the mass fraction of calcium oxide and magnesium oxide in the calcium-magnesium-rich product is 24.4% after conversion; Figure 4 The spectrum corresponding to "900,1h" °C in the middle is the X-ray diffraction spectrum of the silicon-rich product in this example, and the mass fraction of silicon oxide in the silicon-rich...

Embodiment 3

[0035] This example is basically the same as Example 1, except that the calcination temperature is 1000°C.

[0036] In order to verify the effectiveness of this method, we tested the graded materials through X-ray diffraction (XRD) analysis, figure 2 The spectrum corresponding to "1000°C, 1h" in "1000°C, 1h" is the X-ray diffraction spectrum of the phosphorus-rich product in this example, where apatite is converted into P 2 o 5 , P 2 o 5 Accounting for 31.44% of the total mass of phosphorus-rich products; image 3The spectrum corresponding to "1000°C, 1h" in "1000°C, 1h" is the X-ray diffraction spectrum of the calcium-magnesium-enriched product of this example, and the mass fraction of calcium oxide and magnesium oxide in the calcium-magnesium-enriched product is converted to 25.2%; Figure 4 The pattern corresponding to "1000°C, 1h" in the middle is the X-ray diffraction pattern of the silicon-rich product in this embodiment, and the mass fraction of silicon oxide in th...

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Abstract

The invention belongs to the field of comprehensive utilization of tailings and particularly relates to a method for comprehensively utilizing reverse-flotation phosphorite tailings. According to the method, the reverse-flotation phosphorite tailings are calcinated at 800-1200 DEG C, then calcinated products are crushed, and finally, the crushed calcinated products are graded according to particle sizes so as to obtain calcium-and-magnesium-rich products, phosphorus-rich products and silicon-rich products, wherein the phosphorus-rich products can be used as raw materials for the phosphorus chemical industry, and the calcium-and-magnesium-rich products and the silicon-rich products can be used as raw materials of building materials. The method is simple in technological process, basically free from emissions of waste water and waste solids and suitable for industrial application; and by the aid of the method, the purpose of efficient utilization of the reverse-flotation phosphorite tailings is achieved, and the method has the positive significance in comprehensive utilization of mineral resources and environmental protection.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of tailings, in particular to a method for comprehensive utilization of reverse flotation phosphorite tailings. Background technique [0002] Phosphate rock is an important chemical mineral raw material. In order to meet the quality requirements of wet-process phosphoric acid for raw material ores, at present, my country mainly obtains phosphorous concentrate suitable for the production of phosphoric acid through various beneficiation technologies. Reverse flotation phosphate ore tailings are industrial waste residues left after phosphorus is enriched by reverse flotation process. Its main mineral composition is: dolomite, apatite and quartz minerals in the form of collophosphine. Usually every 1t of phosphorous concentrate is produced, 0.44t of tailings are produced, and about 7 million tons of phosphorous tailings are produced every year. Phosphorus tailings that have not been effectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C04B7/14C04B18/12
CPCY02P40/10Y02W30/91
Inventor 曹宏薛俊梁兴荣向兴王其林唐敏赖小莹李先福张晖
Owner WUHAN INSTITUTE OF TECHNOLOGY
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