Method for recovering simple-substance phosphorus from sludge phosphorus via cross-flow membrane microfiltration and application for same

A technology of cross-flow membrane and recovery sheet, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as complex process, incomplete pollution control, and low recovery rate of elemental phosphorus

Active Publication Date: 2013-07-24
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned methods either have a low recovery rate of elemental phosph...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The method of recovering elemental phosphorus from sludge phosphorus through terminal membrane microfiltration, firstly, mix the sludge phosphorus raw material (the sludge phosphorus comes from the refining tank, the content of elemental phosphorus is 32%, and the total amount of sludge phosphorus to be treated is 200kg) with 80℃ heat mixed with water, so that the elemental phosphorus in it melts and settles under hot water heat preservation; then, only the melted sediment in the above mixture (in which the content of fine particles is 0.012%) is pumped into the terminal membrane microfiltration device to make it in 0.2Mpa Under the filtration pressure, the membrane element is filtered at a filtration temperature of 70°C. The membrane element uses a stainless steel porous material filter tube with a filtration accuracy of 15 μm; finally, the product that passes through the above membrane element is sent to the phosphorus receiving tank, and Elemental phosphorus is obtain...

Embodiment 2

[0021] The method of recovering elemental phosphorus from sludge phosphorus through terminal membrane microfiltration, firstly, mix the raw material of sludge phosphorus (sludge phosphorus comes from a refining tank, the content of elemental phosphorus is 32%, and the total amount of sludge phosphorus to be treated is 200kg) with 70°C heat Mixed with water, the elemental phosphorus in it melts and settles under hot water heat preservation, and at the same time, the pH value of the mixture is brought to 8; then, only the molten sediment in the above mixture (the content of fine particles is 0.008%) is pumped into the terminal membrane Microfiltration device, so that it is filtered by the membrane element at a filtration temperature of 60°C under a filtration pressure of 0.3Mpa. The membrane element uses an alumina ceramic porous filter tube with a filtration accuracy of 2 μm; finally, the above-mentioned The product of the membrane element is sent to the phosphorus receiving tan...

Embodiment 3

[0023] The method of recovering elemental phosphorus from sludge phosphorus through terminal membrane microfiltration, firstly, the raw material of sludge phosphorus (sludge phosphorus comes from a refining tank, the content of elemental phosphorus is 32%, and the total amount of sludge phosphorus to be treated is 200kg) is mixed with 65°C heat mixed with water, so that the elemental phosphorus in it melts and settles under hot water heat preservation, and at the same time, adds inorganic flocculant polymerized ferric aluminum sulfate to the mixture; then, only the molten sediment in the above mixture (the content of fine particles is 0.009%) It is pumped into the terminal membrane microfiltration device, so that it is filtered by the membrane element at a filtration temperature of 55°C under a filtration pressure of 0.2Mpa. The membrane element uses a TiAl porous material filter tube with a filtration accuracy of 4 μm; finally, the The product passing through the above membran...

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PUM

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Abstract

The invention discloses a method for recovering simple-substance phosphorus from sludge phosphorus via cross-flow membrane microfiltration, which is remarkably increased in the recovery rate of simple-substance phosphorus compared with the existing method. The invention further discloses a production process for yellow phosphorus, which omits a two-stage refining groove and an all sludge phosphorus pool compared with the existing process, so that lots of investment, manpower, water and energy consumption can be saved. The method for recovering simple-substance phosphorus from sludge phosphorus disclosed by the invention comprises the following steps of: firstly, mixing a sludge phosphorus raw material with hot water at 60-90 DEG C, so as to melt and settle simple-substance phosphorus in the sludge phosphorus raw material under the heat insulation of the hot water; secondly, only drawing the melted and settled substances in the mixture aforementioned in a cross-flow membrane microfiltration device, so as to filter the melted and settled substances by a membrane component at a filter temperature of 50-85 DEG C and under a filter pressure of 0.1-0.3 MPa; and finally, conveying the product passing through the membrane component aforementioned to a phosphorus-receiving tank, and settling at the bottom of the phosphorus-receiving tank to obtain simple-substance phosphorus, wherein the speed of the mixture flowing along the surface of the membrane component during filtering is controlled to be 0.01-0.5 m/s.

Description

technical field [0001] The invention relates to a method for recovering elemental phosphorus from sludge phosphorus and a yellow phosphorus production process using the method. Background technique [0002] Yellow phosphorus is a chemical product with high energy consumption, high material consumption and high pollution. The current yellow phosphorus production process is to put phosphate rock, coke and silica raw materials into the electric furnace for reaction in proportion, then spray and cool the furnace gas to obtain crude phosphorus, and then import the crude phosphorus into the refining tank for two-stage refining, and finally obtain Phosphorus products. A large number and variety of toxic and harmful substances will be produced in the above process, such as waste water, slag, yellow phosphorus tail gas, mud phosphorus, etc. From a circular economy perspective, these substances are useful by-products. At present, the comprehensive treatment and utilization of harmf...

Claims

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Application Information

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IPC IPC(8): C01B25/047
Inventor 高麟汪涛宿其
Owner CHENGDU INTERMENT TECH
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