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Low-impurity yellow phosphorus production method based on yellow phosphorus production technological process control

A production method and production process technology, which are applied in the production field of low-impurity yellow phosphorus, can solve the problems of high content of yellow phosphorus impurities, high arsenic content, large amount of silica-containing phosphorus mud, etc., and achieve the effect of simplifying the subsequent refining process

Inactive Publication Date: 2015-01-14
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a low-arsenic and low-impurity yellow phosphorus production method in view of the problems that the current industrial production of yellow phosphorus has a high impurity content, especially high arsenic content, and a large amount of phosphorus sludge containing silica gel.

Method used

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  • Low-impurity yellow phosphorus production method based on yellow phosphorus production technological process control
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  • Low-impurity yellow phosphorus production method based on yellow phosphorus production technological process control

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Embodiment 1

[0049] A production method of yellow phosphorus with low impurities based on the process control of yellow phosphorus production process, aimed at a yellow phosphorus electric furnace (12500KVA) production device with an output of 5000 tons / year (annual operating hours 7200h), in which the phosphate rock into the furnace contains five Phosphorus oxide (P 2 o 5 ) is 30%, the arsenic content is 78mg / kg, the ratio of raw and auxiliary materials and other operating conditions are the same as the conventional operation, and the gas output of the yellow phosphorus electric furnace is about 7100m 3 / h, the temperature is about 230°C. use figure 1 The process technology shown carries out subsequent low-impurity yellow phosphorus production process control, and the specific steps include:

[0050] 1) Remove about 90% of the dust impurities and a small amount of arsenic solid dust from the furnace gas 101 that leaves the yellow phosphorus electric furnace in the yellow phosphorus pro...

Embodiment 2

[0054] A production method of yellow phosphorus with low impurities based on the process control of yellow phosphorus production process, aimed at a yellow phosphorus electric furnace (15000KVA) production device with an output of 7500 tons / year (annual operating hours 7200h), in which the phosphate rock contained in the furnace contains pentoxide diphosphorus (P 2 o 5 ) is 30.5%, the arsenic content is 76mg / kg, the ratio of raw and auxiliary materials and other operating conditions are the same as those of conventional operation. The output gas volume of the yellow phosphorus electric furnace is about 11000m 3 / h, the temperature is about 235°C. use figure 2 The process technology shown carries out subsequent yellow phosphorus production process control, and specific steps include:

[0055] 1) The furnace gas 101 leaving the yellow phosphorus electric furnace passes through the multi-tube cyclone dust collector 3 to remove solid dust. In order to ensure that the dust col...

Embodiment 3

[0059] A production method of yellow phosphorus with low impurities based on the process control of yellow phosphorus production process, aimed at a yellow phosphorus electric furnace (15000KVA) production device with an output of 7500 tons / year (annual operating hours 7200h), in which the phosphate rock contained in the furnace contains pentoxide diphosphorus (P 2 o 5 ) is 30%, the arsenic content is 78mg / kg, the ratio of raw and auxiliary materials and other operating conditions are the same as the existing conventional operation. The output gas volume of the yellow phosphorus electric furnace is about 11000m 3 / h, the temperature is about 240°C. use image 3 The process technology shown carries out subsequent yellow phosphorus production process control, and specific steps include:

[0060] 1) The furnace gas 101 leaving the yellow phosphorus electric furnace passes through the electrostatic precipitator 1 to remove solid dust. In order to ensure that the dust collected...

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Abstract

The invention relates to a low-impurity yellow phosphorus production method based on yellow phosphorus production technological process control. The low-impurity yellow phosphorus production method is mainly used for solving the problems that yellow phosphorus products produced in the prior art are high in impurity content, especially high in arsenic content. According to the low-impurity yellow phosphorous production method disclosed by the invention, high-temperature furnace gas discharged from a yellow phosphorus electric furnace in the process of yellow phosphorus production is directly subjected to step-by-step impurity removal, and by using the temperature difference between saturated steams of yellow phosphorus and arsenic and the temperature condition limitation of SiF4 and H2O decomposition reactions, the high-temperature furnace gas of the yellow phosphorus electric furnace is subjected to gas-solid (liquid) separation and multistage water washing for cooling, and the like step by step, so that a simple arsenic substance which is sublimated and separated out in advance is separated from yellow phosphorus subsequently separated out, and the separation of ash contents in the high-temperature furnace gas and SiO2 colloids produced by the hydrolysis of SiF4 is also realized, liquid yellow phosphorus crude products separated out by condensing in different temperature stages are respectively collected, and then the crude products are subjected to conventional separation and refining treatment so as to obtain yellow phosphorus products with different impurity contents. The method disclosed by the invention is used for solving the existing quality problem of industrial yellow phosphorus well, and can be applied to the industrial production of yellow phosphorus.

Description

technical field [0001] The invention relates to a production method of low-impurity yellow phosphorus based on yellow phosphorus production process control, and belongs to the technical field of clean production of phosphorus chemical industry. Background technique [0002] At present, both at home and abroad, industrial yellow phosphorus is produced by using phosphate rock, silica and coke to reduce phosphide at high temperature in an electric furnace. The basic process is to mix phosphate rock, silica and coke (or high-quality anthracite) evenly according to the process ratio, then send them into the electric furnace after mixing, and heat them to 1350 to 1450°C in the electric furnace, and the following main chemical reactions will occur: [0003] Ca 10 f 2 (PO4) 6 +15C+6SiO2 2 = 3P 2 +15CO+3Ca 3 Si 2 o 7 +CaF 2 (1) [0004] 6CaF2+7SiO 2 =3SiF 4 +2Ca 3 Si 2 o 7 (2) [0005] The elemental phosphorus generated by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/047
Inventor 毕亚凡刘璐刘大银
Owner WUHAN INSTITUTE OF TECHNOLOGY
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