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Mixed salt based on coke oven flue gas desulfurization ash, preparation method and application

A desulfurization ash and mixed salt technology, applied in the field of preparation of mixed salt based on coke oven flue gas desulfurization ash, coke oven flue gas desulfurization ash, can solve the problems of endangering the food chain, drinking water pollution, hindering the growth of surrounding plant roots, etc. Achieve the effect of realizing environmental friendliness and ensuring safety

Active Publication Date: 2020-07-17
山西焦化股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stacking or landfill treatment of desulfurization ash will infiltrate into the soil after rain, changing the soil quality and soil structure, affecting the microbial activities in the soil, hindering the root growth of surrounding plants, or accumulating in the surrounding organisms, endangering the food chain; or Infiltration into groundwater will cause drinking water to be polluted, causing poisoning incidents or even fatal accidents; entering into water body will cause changes in water body such as acidity, alkalinity, eutrophication, mineralization, increase of suspended solids, and even poisoning, which will endanger organisms and human health

Method used

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  • Mixed salt based on coke oven flue gas desulfurization ash, preparation method and application
  • Mixed salt based on coke oven flue gas desulfurization ash, preparation method and application
  • Mixed salt based on coke oven flue gas desulfurization ash, preparation method and application

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Embodiment 1

[0022] The preparation method of the mixed salt based on coke oven flue gas desulfurization ash, the steps are:

[0023] (1) Put coke oven flue gas desulfurization ash in a rotating high-temperature calciner at 600 o C and 600 o Carbon dioxide and above are calcined for 2 hours or more, and the calcined gas is carbon dioxide and water vapor, which are discharged into the coke oven flue gas discharge system after recovering heat;

[0024] (2) The composition analysis report of the desulfurized ash calcined in step (1) is as follows: image 3 and 4 As shown, the desulfurization ash is heated and stirred with a certain amount of deionized water to form a solution, the solution concentration is 26%-28%, and then filtered with a filter press to obtain the filtrate (called raw material liquid) and insoluble filter residue, filter residue After accumulation, it is used for coal blending and coking;

[0025] where Na at 100°C 2 CO 3 -Na 2 SO 4 -NaCl-H 2 The phase diagram of t...

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Abstract

The invention discloses mixed salt based on coke oven flue gas desulfurization ash, a preparation method and application, belongs to the technical field of environmental protection, and relates to thecoke oven flue gas desulfurization ash. The mixed salt based on the coke oven flue gas desulfurization ash is a mixed salt of sodium sulfate and alkali mirabilite, and is obtained by calcining the desulfurization ash at a high temperature, dissolving the calcined desulfurization ash in water, and carrying out evaporative crystallization at a temperature of less than 100 DEG C. The method solves aseries of environmental protection problems generated after coke oven flue gas desulfurization, turns waste into wealth, is suitable for large-scale popularization in the coking industry, and realizes environmental protection, resource reutilization and sustainable development.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to coke oven flue gas desulfurization ash, in particular to a mixed salt based on coke oven flue gas desulfurization ash, a preparation method and an application. Background technique [0002] With the strengthening of national environmental governance, the treatment of waste gas is the highlight of national environmental governance. There are a total of 612 coking-related enterprises in the country (data from the Bureau of Statistics, including mechanical coke, semi-coke, and heat recovery coke oven manufacturers), coke oven More than two thousand seats. More and more attention has been paid to the air pollution caused by sulfide, nitride and dust in coke oven flue gas, which in turn causes damage to all important environmental factors such as water, soil and organisms. At present, the country requires coke oven flue gas to be desulfurized and denitrified. The mediu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01D5/16C01D7/24C01D7/40C11D3/04C11D3/60
CPCC01D5/004C01D5/16C01D7/40C01D7/24C11D3/046C01P2006/80Y02A50/20
Inventor 郭毅民杨瑞平王泽云王兰君关红燕李红耀师晋恺荆菊平田利鹏
Owner 山西焦化股份有限公司
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