Method for treating production waste of phosphorus industry and products produced by same

A technology of waste and derivatives, applied in the direction of combustion method, combustion type, incinerator, etc., can solve the problems of concentrated wastewater to be further treated, yellow phosphorus industrial wastewater treatment is not thorough, etc., to avoid the use of chemical reagents and reduce treatment costs , the effect of full recycling

Active Publication Date: 2012-08-01
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the method in the above-mentioned prior art can only process phosphorus industrial waste from a specific source, and the treatment of yellow phosphorus industrial wastewater in patent CN200510018747 is not thorough; in patent CN201010123176, concentrated crystallization and separation of concentrated wastewater after obtaining orthophosphate products are still pending further processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Potassium hydroxide was used to adjust the crystallization residual mother liquor produced in the production process of potassium dihydrogen phosphate to 2.0 for the number of moles of potassium:moles of phosphorus. Then the obtained mother liquor is sprayed into a vertical incinerator, while air and natural gas are fed in for combustion and oxidation, the incineration temperature is controlled at 700-800° C., and solids are obtained at the bottom of the incinerator. The solid is entrained by air into the grate incinerator, and at the same time, natural gas is fed into it for further combustion and oxidation, and the temperature is controlled at 600-700°C. The total time the waste stays in the incinerator is 15 minutes. Finally, a white solid with a potassium pyrophosphate content of about 90% is obtained.

Embodiment 2

[0074] The residual crystallization mother liquor produced in the production process of sodium dihydrogen phosphate is adjusted with sodium hydroxide to adjust the molar ratio of sodium: molar ratio of phosphorus to 1.7. Then the obtained mother liquor is sprayed into a vertical incinerator, and air and natural gas are introduced at the same time for combustion and oxidation, the incineration temperature is controlled at 600-700°C, and solids are obtained at the bottom of the incinerator. Transfer the solid matter into the grate incinerator, inject natural gas to ignite it, and at the same time pass air into it for further combustion and oxidation. The temperature is controlled at 400-500°C, and the total time for the waste to stay in the incinerator is 45 minutes. Finally, a white solid with a sodium tripolyphosphate content of about 90% is obtained.

Embodiment 3

[0076] The phosphorous acid raffinate produced in the phosphorous acid production process, use sodium hydroxide to adjust the sodium molarity: the phosphorus molarity is 1.5, forms the solid-liquid mixture of phosphorous acid salt, controls wherein the average particle diameter of solid is less than 200 μ m (greater than this numerical value The particle size must be reduced below this value by known means such as crushing or grinding). Then mix the obtained mixture with fuel waste methanol to form a homogeneous fluid, which is sprayed into the vertical incinerator, and air is introduced at the same time, and ignited, the incineration temperature is controlled at 600-700°C, and solids are obtained at the bottom of the incinerator. The solid matter is transferred to the grate incinerator, further oxidized under the condition of injecting natural gas to ignite and air at the same time, the temperature is controlled at 350-450°C, and the total time for the waste to stay in the two...

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Abstract

The invention relates to a method for treating production waste of phosphorus industry and recycling phosphorus from the treated production waste, which includes performing high-temperature oxidation of the waste at the temperature of from 250 DEG C to 1200 DEG C by enabling the production waste of phosphorus industry to contact with oxygen-containing gases, and recycling the obtained solid products. By using the method, use of expensive drugs can be avoided, and secondary waste which is hard to deal with cannot be produced. Production waste liquid of phosphorous pesticides can be converted into matters such as pyrophosphate, polyphosphates, metaphosphate, orthophosphate and the like. The matters can be applied to other chemical industrial productions, so that phosphorus elements can be recycled and utilized.

Description

technical field [0001] The invention relates to a method for treating phosphorus industrial production waste and a product obtained by the method, more specifically, relates to a method for treating phosphorus industrial production waste at high temperature and recovering phosphorus resources. Background technique [0002] Based on the pressure of resources and environment, since the late 1990s, people began to study the technology of removing and recovering phosphorus from phosphorus-containing waste, and some progress has been made. [0003] At present, biological and chemical methods are widely used at home and abroad and have relatively good phosphorus removal effects. Among them, the biological method occupies a large area, and usually requires the use of chemical phosphorus removal method for pretreatment. This method is not ideal for phosphorus removal of materials with high phosphorus content and organic phosphorus content, and the recovery and utilization of phospho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/00
Inventor 王伟周曙光任不凡揭少卫秦龙叶世胜陈军孙惠芬姜胜宝佘慧玲祝小红华瑛朱建民史国华魏晓红
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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