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A method and preparation process for preparing yellow phosphorus from low-grade phosphate rock

A low-grade, phosphate rock technology, applied in chemical instruments and methods, phosphorus compounds, phosphate material treatment, etc., can solve problems such as ineffective use of by-products, environmental protection, affecting yellow phosphorus yield, and broken electrodes. Achieve the effects of reducing environmental protection treatment costs, shortening roasting time, and reducing refining costs

Active Publication Date: 2018-08-17
成都天屿新磷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (3) The operating parameters of the electric furnace are also a major factor affecting the yellow phosphorus preparation process. If the control is not good, not only the yellow phosphorus yield will be affected, the by-products will not be effectively utilized, and environmental problems will arise, but it will also easily lead to arching, material collapse, Accidents such as broken electrodes

Method used

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  • A method and preparation process for preparing yellow phosphorus from low-grade phosphate rock
  • A method and preparation process for preparing yellow phosphorus from low-grade phosphate rock
  • A method and preparation process for preparing yellow phosphorus from low-grade phosphate rock

Examples

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Effect test

Embodiment 1

[0119] P with mining silicon-rich measures 2 o 5 Low-grade phosphate rock with a content of 22.5%, the first enrichment of P by reverse flotation 2 o 5 , to obtain the special phosphate rock powder for yellow phosphorus. Iron-containing compounds are removed during phosphate rock crushing. Add 4% modified crude phosphoric acid to the special phosphate rock powder for yellow phosphorus, and then perform 19MPa pressure to press into pellets. Phosphate ore pellets with a ball diameter of 5mm to 30mm are obtained by screening, and after the phosphate ore pellets are consolidated by a consolidation machine, the sensible heat of the furnace gas in the yellow phosphorus electric furnace is used for secondary consolidation, and finally the yellow phosphorus is produced by reaction. Among them, the first consolidation temperature before entering the yellow phosphorus electric furnace is 650°C.

[0120] In this example, the phosphate rock powder P specially used for yellow phosphor...

Embodiment 2

[0123] P with mining silicon-rich measures 2 o 5 Low-grade phosphate rock with a content of 22.5%, the first enrichment of P by reverse flotation 2 o 5 , to obtain phosphate rock powder for yellow phosphorus. Iron-containing compounds are removed during phosphate rock crushing. Add 4% binder to the special phosphate rock powder for yellow phosphorus, and then perform 19MPa pressure to press into balls. Phosphate ore pellets with a ball diameter of 5mm to 30mm are obtained by screening, and after the phosphate ore pellets are consolidated by a consolidation machine, the sensible heat of the furnace gas in the yellow phosphorus electric furnace is used for secondary consolidation, and finally the yellow phosphorus is produced by reaction. Among them, the first consolidation temperature before entering the yellow phosphorus electric furnace is 650°C.

[0124] In this example, the phosphate rock powder P specially used for yellow phosphorus enriched for the first time by mean...

Embodiment 3

[0127] with SiO 2 Content 35%, P 2 o 5 Low-grade phosphate rock with a content of 22.5% is obtained by positive flotation to obtain phosphate rock powder special for yellow phosphorus. Iron-containing compounds are removed during phosphate rock crushing. After drying the special phosphate rock powder for yellow phosphorus at 100-300°C (controlling the moisture content of the dry phosphate rock powder for yellow phosphorus to 0.6%), add the modified crude phosphoric acid. After stirring and homogenizing, press 14MPa pressure to form pellets, sieve to obtain phosphate rock powder pellets for yellow phosphorus with a ball diameter of 5mm to 30mm, and then consolidate the phosphate rock powder pellets for yellow phosphorus with a consolidation machine and use The sensible heat of the furnace gas in the yellow phosphorus electric furnace carries out secondary consolidation, and the final reaction produces yellow phosphorus. Among them, the first consolidation temperature before...

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Abstract

The invention relates to a method used for producing yellow phosphorus from low-grade phosphate ore. According to the method, phosphate ore powder with appropriate silicon content and low iron content is obtained via selectively adapting silicon concentrating or removing technology and removing iron-containing compounds in smashing period based on the difference of phosphate ores in mining period; a first time P2O5 enrichment and a second time P2O5 enrichment are carried out respectively via drying, roasting, or obverse flotation, or reverse flotation, drying,, curing, and obtaining of phosphate ore balls. The method is low in cost, high in efficiency, is friendly to the environment, is capable of improving yellow phosphorus quality, avoiding accidents or faults such as arch structure formation, material collapse, and electrode broken, and ensuring safe, stable, and high efficiency operation of electric furnaces.

Description

technical field [0001] The invention relates to the field of yellow phosphorus preparation, in particular to a method and a cyclic preparation process for preparing yellow phosphorus by using low-grade phosphate rock. The method and the cyclic preparation process are specifically an environmentally friendly overall solution for preparing yellow phosphorus by electrothermal method. Background technique [0002] my country's proven phosphate rock reserves are 20.016 billion tons, more than 90% of which are low-grade phosphate rocks, and less than 8% of rich phosphate rocks. In the past ten years, due to the rapid development of the phosphorus chemical industry, the grade of phosphorus ore has been declining. Although the production of phosphate fertilizers solves the problem of ore utilization through mineral processing, the grade of yellow phosphorus ore continues to decrease, and the material consumption, energy consumption, and production costs of yellow phosphorus producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/01C01B25/027C01B33/107
CPCC01B25/01C01B25/027C01B33/10705
Inventor 罗宗恬
Owner 成都天屿新磷科技有限公司
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