Method of recycling solid waste salts in chemical wastewater

A treatment method and technology for chemical wastewater, applied in chemical instruments and methods, inorganic chemistry, chlorine/hydrogen chloride, etc., can solve the problems of inability to achieve zero discharge of wastewater, groundwater and soil pollution, occupation of land resources, etc., to meet sustainable development. requirements, avoid the occupation of land resources, and reduce the degree of environmental pollution

Inactive Publication Date: 2017-05-17
科莱环保(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, landfill is the main way to deal with solid waste and miscellaneous salt in China. This treatment method is expensive, occupies a lot of land resources, and may cause groundwater and soil pollution.
This method cannot achieve zero discharge of wastewater in the true sense

Method used

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  • Method of recycling solid waste salts in chemical wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 2.18 tons of solid waste salt to the glass-lined reactor with stirrer, thermal resistance, pressure gauge, liquid level gauge, etc., start the hydrogen chloride absorption and storage system, slowly add 3.11 tons of 90% sulfuric acid, and keep stirring Heat to 135°C by steam, and keep warm for 35min under the condition of 0.2MPa; introduce the reaction liquid into the reaction liquid storage tank containing 0.48 tons of water and mix evenly, and introduce it into the crystallizer through a pump, control the temperature of the crystallizer to 35°C, and the pressure Cooling and crystallization under the condition of 0.1MPa, the sodium bisulfate slurry is thickened through a thickener, the working pressure of the thickener is 0.1MPa, and the working temperature is 25°C, and then enters the high-purity material sling centrifuge, while centrifugal dehydration Add saturated sodium bisulfate solution for washing, the working pressure of the sling centrifuge is 0.08MPa, and ...

Embodiment 2

[0036]Add 2.18 tons of solid waste salt to the glass-lined reactor with stirrer, thermal resistance, pressure gauge, liquid level gauge, etc., start the hydrogen chloride absorption and storage system, slowly add 3.11 tons of 95% sulfuric acid, and keep stirring Heat to 150°C by steam, and keep warm for 38min under the condition of 0.4MPa; introduce the reaction solution into the reaction solution storage tank containing 0.5 tons of water and mix evenly, and introduce it into the crystallizer through a pump, control the temperature of the crystallizer to 40°C, and the pressure Cooling and crystallization under the condition of 0.2MPa, the sodium bisulfate slurry is thickened through a thickener, the working pressure of the thickener is 0.15MPa, and the working temperature is 36°C, and then enters the high-purity material sling centrifuge, while centrifugal dehydration Add saturated sodium bisulfate solution for washing, the working pressure of the sling centrifuge is 0.1MPa, an...

Embodiment 3

[0038] Add 2.18 tons of solid waste salt to the glass-lined reactor with stirrer, thermal resistance, pressure gauge, liquid level gauge, etc., start the hydrogen chloride absorption and storage system, slowly add 3.11 tons of 95% sulfuric acid, and keep stirring Heat to 142°C by steam, and keep warm for 40min under the condition of 0.3MPa; introduce the reaction liquid into the reaction liquid storage tank containing 0.52 tons of water and mix evenly, and introduce it into the crystallizer through the pump, control the temperature of the crystallizer to 38°C, and the pressure Cooling and crystallization under the condition of 0.1MPa, the sodium bisulfate slurry is thickened through a thickener, the working pressure of the thickener is 0.15MPa, and the working temperature is 38°C, and then enters the high-purity material sling centrifuge, while centrifugal dehydration Add saturated sodium bisulfate solution for washing, the working pressure of the sling centrifuge is 0.12MPa, a...

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Abstract

The invention discloses a method of recycling solid waste salts in chemical wastewater and belongs to the technical field of resource recycling. In the method, solid waste salts obtained by distillation and crystallization of systematic high-concentration saline from coal chemical or petrochemical plants, such as reclaimed water, chemical water and circulating water are subjected to reaction with sulfuric acid to generate hydrogen chloride and sodium hydrogen sulfate crystal; the method comprises the steps of mixing for reacting, storing, absorbing hydrogen chloride, concentrating and crystallizing, separating solid and liquid, washing and centrifuging, drying by hot blast, and packaging. Chemical resources are made full use, the added value of the solid waste salts is increased, no waste liquid is discharged, and the requirements of sustainable development are met.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and specifically relates to a resource treatment method for solid waste miscellaneous salts produced by evaporating and crystallizing high-concentration brine in systems such as coal chemical or petrochemical recycling water, chemical water, and circulating water. Background technique [0002] With the rapid development of my country's economy, the output of solid waste is also showing an increasing trend. The harmfulness of solid waste pollution to the environment and human body cannot be ignored. It directly affects people's lives and seriously affects the environment and human health. [0003] Under the dual pressure of water resources and environmental problems, domestic coal chemical or petrochemical projects have successively built zero-discharge wastewater treatment devices. The high-concentration brine obtained after the wastewater is concentrated and pretreated by membrane conc...

Claims

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Application Information

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IPC IPC(8): C01B7/03C01D5/02
CPCC01B7/035C01D5/02
Inventor 李素青雷传豹
Owner 科莱环保(北京)有限公司
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