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Method for preparing yellow phosphorus from phosphate rock

A technology for phosphate rock and yellow phosphorus, applied in the field of chemical metallurgy, can solve the problems of waste of carbon monoxide resources, severe phosphate rock resources, soaring raw material prices, etc., and achieve the effects of centralized exhaust gas treatment, reduced energy consumption, and environmental friendliness.

Inactive Publication Date: 2007-02-14
YUNNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Rising prices of raw materials, etc.
(4) Environmental pollution is serious
At present, most yellow phosphorus manufacturers only use yellow phosphorus tail gas as fuel or directly burn it with a torch to vent it, which causes great pollution to the ecological environment and is also a waste of carbon monoxide resources.
(5) Phosphate rock resources are severe
Based on the current production and research status of yellow phosphorus, there is no environmentally friendly process that can use low-grade phosphate rock to produce yellow phosphorus

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Main chemical composition of raw materials: P 2 o 5 23%, CaO 36.6%, Fe 2 o 3 12.0%, SiO 2 13.5%, take 50 grams of raw material phosphate rock, add SiO 2 8 grams of silica with a weight percentage of 95% and 9 grams of coke with a carbon content of 72% by weight, mixed and ground to 0.01-0.1mm, added 3 grams of water, mixed evenly, pressed into a briquette with a diameter of 10mm, and placed in a vacuum furnace Inside, evacuate to 80Pa, start to heat up to 350°C for sintering, keep warm for 20 minutes, continue to heat up to 1100-1200°C for 1 hour, and carry out extraction. Phosphorous, silicate-based slag is removed from the bottom of the furnace. The purity of the yellow phosphorus reaches over 99.0%, and the recovery rate reaches over 80%.

Embodiment 2

[0016] Main chemical composition of raw materials: P 2 o 5 30%, CaO 40.5%, Fe 2 o 3 5.3%, SiO 2 20.0%, take 10 kg of phosphate rock as raw material, add SiO 2 1.5 kg of silica with a weight percentage of 96% and 1.7 kg of coal with a carbon content of 80% by weight, mixed and ground to 0.1-0.5 mm, adding 0.2 kg of water and 2.2 kg of coal with a caking index G of 45, mixed evenly, and pressed Form a briquette with a diameter of 10-50mm, put it into a vacuum furnace, evacuate to 120Pa, start heating to 300°C for sintering, keep warm for 50 minutes, continue to heat up to 1200-1350°C, keep warm for 100 minutes, and the yellow phosphorus produced The steam enters the water-cooling device after passing through the filter to produce the finished yellow phosphorus, and the slag mainly composed of silicate is discharged from the bottom of the furnace. . The purity of the yellow phosphorus reaches over 99.5%, and the recovery rate reaches over 85%.

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Abstract

The present invention relates to yellow phosphorus preparing process with phosphorus ore with P2O5 content not less than 17 wt% as material. The preparation process includes the steps of: mixing phosphorus ore material with silica and carbon reductant, grinding, adding water and / or coal, re-mixing and palletizing; sintering inside vacuum furnace at 200-400 deg.c for 20-60 min; extruding at 900-1500 deg.c for 60-120 min to produce yellow phosphorus vapor, filtering and water cooling in a water cooler to obtain industrial level yellow phosphorus product. The said preparation process can treat low grade phosphorus ore and has low power consumption and less environmental pollution.

Description

1. Technical field [0001] The invention belongs to the production method of yellow phosphorus in the field of chemical metallurgy. 2. Technical Background [0002] The production of yellow phosphorus belongs to both the chemical raw material production industry and the nature of the smelting industry. It should be said that yellow phosphorus belongs to the smelting industry that consumes a lot of energy. Its production process and production methods are basically similar to metallurgical smelting. Its production methods include blast furnace method and electric furnace method. Due to the poor technical and economic indicators of blast furnace method, electric furnace method is used at home and abroad. The phosphate rock is melted at high temperature, and the phosphorus pentoxide in the ore overflows, and reacts with the carbon in the coke in a closed environment to reduce it into elemental phosphorus gas. Requires a lot of heat - electricity. my country is a big producer o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/027
Inventor 李秋霞荆碧戴永年陈为亮杨部正王平艳张慧萍尹琦王帮进王宇飞
Owner YUNNAN NORMAL UNIV
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