Method for preparing ammonia water and calcium chloride solution through decomposition recovery of ammonium chloride waste liquor

A technology of calcium chloride solution and ammonium chloride, which is applied in chemical instruments and methods, metallurgical wastewater treatment, calcium/strontium/barium chloride, etc., can solve the problems of high consumption and poor economy, and achieve less waste discharge and high product quality. Good quality and good economic benefits

Inactive Publication Date: 2015-09-02
江苏大江干燥设备有限公司
View PDF8 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] All the above disclosed ammonium chloride wastewater treatment technologies adopt different methods to increase the concentration of ammonium chloride and then evaporate and crystallize the ammonium chloride product, all of which have problems such as high consumption and poor economy.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The method for decomposing and recycling ammonium chloride waste liquid to produce ammonia and calcium chloride solution mainly includes the following steps:

[0030] (1) After the ammonium chloride waste liquid produced by the production enterprise is pretreated to remove oil stains and other impurities, the mass fraction of ammonium chloride reaches about 15%, and 90% ammonium chloride and 90% calcium hydroxide powder are added to the In the reactor, the reaction is a continuous feeding reaction, and the reactor is equipped with a stirring and premixing feeding device. The excess of calcium hydroxide was 3%. The mass ratio of ammonium chloride and calcium hydroxide is 1:0.7; then react at 90°C for 30 minutes; the reaction liquid enters the distillation tower, and reversely contacts with the low-pressure steam from the bottom of the distillation tower to distill the ammonia in the solution, and The ammonia gas generated in the reactor is condensed and then sent to the...

Embodiment 2

[0034] The method for decomposing and recycling ammonium chloride waste liquid to produce ammonia and calcium chloride solution mainly includes the following steps:

[0035](1) After the ammonium chloride waste liquid produced by the production enterprise is pretreated to remove other impurities such as oil stains, the mass fraction of ammonium chloride reaches 10%, and 90% ammonium chloride and 90% calcium hydroxide powder are added to the reaction In the reactor, the reaction is a continuous feeding reaction, and the reactor is equipped with a stirring and premixing feeding device. The excess of calcium hydroxide was 5%. The mass ratio of ammonium chloride and calcium hydroxide is 1:0.73; then react at 80°C for 30 minutes; the reaction liquid enters the distillation tower, and reversely contacts with the low-pressure steam from the bottom of the distillation tower to distill the ammonia in the solution, Together with the ammonia gas produced in the reactor, it is condensed ...

Embodiment 3

[0039] The method for decomposing and recycling ammonium chloride waste liquid to produce ammonia and calcium chloride solution mainly includes the following steps:

[0040] (1) After the ammonium chloride waste liquid produced by the production enterprise is pretreated to remove other impurities such as oil stains, the mass fraction of ammonium chloride reaches 20%, and 90% ammonium chloride and 90% calcium hydroxide powder are added to the reaction In the reactor, the reaction is a continuous feeding reaction, and the reactor is equipped with a stirring and premixing feeding device. The excess of calcium hydroxide was 8%. The mass ratio of ammonium chloride and calcium hydroxide is 1:0.75; then react at 70°C for 40 minutes; the reaction liquid enters the distillation tower, and reversely contacts with the low-pressure steam from the bottom of the distillation tower to distill the ammonia in the solution, and The ammonia gas generated in the reactor is condensed and then sen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing ammonia water and calcium chloride solution through the decomposition recovery of ammonium chloride waste liquor. The method comprises the following steps: the waste liquor is pretreated, and ammonium chloride and calcium oxide or calcium hydroxide powder is added into the pretreated ammonium chloride waste liquor; ammonia is distilled from the treated ammonium chloride waste liquor and is transferred into an ammonia absorption tower after being condensed, and a reaction liquid flows out from the bottom of a distillation tower; ammonia is absorbed from the condensed ammonia in the absorption tower by using desalted water, and the tail gas is exhausted after residual ammonia is washed by a tail gas washing tower; reaction liquid out of the bottom of the distillation tower is subjected to flash vaporization for recycling the energy and then is transferred into a clarifying barrel, and the clarified calcium chloride supernatant is used as the target product. According to the invention, the method is particularly suitable for the transformation of ammonium chloride wastewater treatment technology of enterprises in the existing rare earth industry, potassium carbonate industry and baking soda industry, and is simple in process; the ammonia is recycled by using desalted water through multi-stage absorption, and the recovery rate is up to 99%; the high-concentration calcium chloride solution can be used for producing calcium chloride products and the products can be recycled so as to have better economic benefits.

Description

technical field [0001] The invention relates to a treatment method for ammonium chloride waste liquid, in particular to a method for decomposing and recovering ammonium chloride waste liquid to prepare ammonia water and calcium chloride solution. Background technique [0002] The treatment of ammonium chloride wastewater in the rare earth industry, potassium carbonate industry and baking soda industry is a major problem faced by related production enterprises. The recovery effect of biological and physical and chemical methods is not good. With the development of science and technology, some new processes New technology has begun to be applied to the treatment of ammonium chloride wastewater, but in the end it is concentrated to produce ammonium chloride products. At present, there is no treatment method that can bring better economic benefits to enterprises. Ammonium chloride-containing wastewater The processing technology mainly includes the joint application of multi-effe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F11/24C01C1/02C02F101/12C02F101/16C02F103/16C02F103/34
Inventor 莫如财莫旭东李振宁
Owner 江苏大江干燥设备有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap