Efficient and low-pollution phosphorous-slurry recycling method

A sludge phosphorus recovery and low pollution technology, applied in the field of phosphorus chemical industry, can solve the problems of difficult monitoring of equipment safety, reduced safety performance, and non-standard phosphorus content, etc., and achieve good recovery effect, low operating cost, and optimized process effect

Active Publication Date: 2016-08-24
云南澄江志成磷业化工有限责任公司
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Problems solved by technology

[0012] In order to solve the problems of low recovery rate, difficult monitoring of equipment safety and substandard phosphorus content in the exhaust tail gas in the existing method of recovery of phosphorus from dry steamed sludge, and the use of many processes and superimposed equipment, the superimposed effect cannot be obtained, and the safety performance is also caused reduction, cost increase and other problems, the present invention provides a highly efficient and low-pollution sludge phosphorus recovery method, which does not follow the prior art indefinitely extending the single-stage recovery process, that is, connecting multiple groups of phosphorus receiving tanks or phosphorus collecting pots in series, and It is a multi-stage recovery process with different function objects and functional emphases, which optimizes the process of each stage of sludge phosphorus recovery and is more targeted, thereby improving the overall recovery rate and minimizing the impact on the natural environment

Method used

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  • Efficient and low-pollution phosphorous-slurry recycling method

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, a kind of highly efficient and low-pollution mud phosphorus recovery method described in this embodiment comprises the following process steps:

[0032] ① Phosphorus steaming steps:

[0033] First, the mud phosphorus is sent to the transition tank by the mud water pump for pretreatment. The pretreatment is to separate the mud phosphorus mixed with water in the sealed transition tank to remove the easily separated water and reduce the Energy consumption in the dry steaming link; then put the mud phosphorus into the rotary pot, use the exhaust gas of the phosphorus furnace to heat outside the rotary pot, heat to 280-330°C and keep it for 5-7 hours, the yellow phosphorus in the mud phosphorus will gradually volatilize into Phosphorus vapor, phosphorus vapor enters the condensation recovery process through the pipeline;

[0034] ②Condensation recovery steps:

[0035] Primary condensation recovery for high phosphorus-containing gases:

[0036] ...

Embodiment 2

[0042] A high-efficiency and low-pollution mud phosphorus recovery method described in this embodiment, its steps are basically the same as those described in Example 1, the difference is that in order to improve the safety performance of the atomization recovery step, an atomization tower is installed to adjust its internal The pressure regulating valve is used to open the pressure relief when the internal pressure of the atomization tower is too high to ensure the safety of the equipment.

Embodiment 3

[0044] A high-efficiency and low-pollution mud phosphorus recovery method described in this embodiment, its steps are basically the same as those described in Example 1, the difference is that in order to improve the recovery rate of phosphorus in the lower part of the atomization tower after condensation, a The cooling layer that increases the liquid stroke is used for the cooling of the gas phase material.

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Abstract

The invention provides an efficient and low-pollution phosphorous-slurry recycling method, and relates to the technical field of phosphorus chemical industry. The problems that multiple processes and multiple superposition devices are adopted in an existing dry-blowing phosphorous-slurry recycling method, the superposition effect can not be achieved, the recycling rate is low, the safety factor of the device is low, and tail gas is not up to the standard are solved. According to the efficient and low-pollution phosphorous-slurry recycling method, it is not followed that single-stage recycling processes are infinitely extended in the prior art, and multistage recycling processes with different acting objects and different function emphasis points are set; in other words, high phosphorus-containing gas is primarily condensed and recycled, secondary phosphorus-containing gas is washed and recycled with cooling water, and thin phosphorus-containing gas is atomized and recycled with cooling water. The all stage technologies of phosphorous-slurry recycling are optimized, pertinence is higher, and the problems that as yellow phosphorus is condensed and collected through a plurality of purely-added series phosphorus receiving troughs or a plurality of purely-added series phosphorus collecting crucibles in the prior art, the whole recycling effect is poor, the device is seriously idled and wasted, the safety factor is decreased, and investment and operation cost are increased are solved.

Description

technical field [0001] The invention relates to the technical field of phosphorus chemical industry, in particular to a method for recovering sludge phosphorus. Background technique [0002] In the production process of electric furnace yellow phosphorus, an important by-product phosphorus sludge, also called sludge phosphorus, will be produced. Sludge phosphorus is mainly a gelatinous substance produced by mixing a part of yellow phosphorus with mineral dust, carbon black and other impurities in the exhaust gas of the electric furnace and water. Under normal circumstances, mud phosphorus contains P30% - 70%, carbon disulfide insoluble matter 5% - 20%, moisture 20% - 60%, and also contains a certain amount of coke black, silicon, calcium and other substances. Sludge phosphorus is a kind of milky colloidal substance, in which yellow phosphorus is adsorbed by porous carbon black. After the hydration of iron, calcium and other colloidal substances and dust, a layer of solvati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01B25/027
CPCC01B25/01C01B25/027
Inventor 张汉雄暴学云
Owner 云南澄江志成磷业化工有限责任公司
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