Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for producing potassium chloride by adopting carnallite hot-melt brine

A technology of carnallite and potassium chloride, applied in the direction of alkali metal chloride, etc., can solve the problems of increasing energy consumption, difficulty in meeting market demand, high energy consumption, etc., and achieve the effect of reducing energy consumption

Active Publication Date: 2013-07-10
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at mining brine in underground carnallite mines, Chinese patent application 201110433253.4 discloses a method for producing potassium chloride, sodium chloride and magnesium flakes by using brine in carnallite mines. Although this method can comprehensively utilize carnallite mines to a certain extent Useful ingredients in brine mining in stone mines, but this method can only obtain one level of KCl products, which is difficult to meet market demand in specific areas
At the same time, this process sends all the potassium halite obtained by decomposing and crystallizing carnallite into the hot melting tank for hot melting, which greatly increases the energy consumption in the actual production process
Therefore, how to solve the problem of single product and high energy consumption on the basis of comprehensive utilization of useful components in carnallite mine mining brine has become the focus of current attention of engineers and technicians in this field

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

[0016] This embodiment includes the following steps:

[0017] (1) Evaporation and crystallization of carnallite: send the filtrate of the fine crystal slurry and the original halogen from step (5) into the evaporator according to the mass ratio of filtrate:original halogen=1:0.5, and send the raw material into the evaporator for the initial production The brine obtained by directly dissolving the carnallite ore extracted from the mine with fresh water is preheated to 137°C for evaporation and concentration. When the boiling point of the liquid in the evaporation chamber rises to 25°C, the material is discharged, and the evaporated mother liquid is discharged to the carnallite for cooling and crystallization. The end temperature of the cooling crystallization is 40°C. The slurry in the cooling crystallizer is sent to the thickener A. The overflow part of the thickener A is the old brine. The bottom flow of the thickener A is filtered and separated, and the obtained filter cake i...

Embodiment 2

[0023] This embodiment includes the following steps:

[0024] (1) Evaporation and crystallization of carnallite: send the filtrate of the fine crystal slurry and the original halogen from step (5) into the evaporator according to the mass ratio of filtrate:original halogen=1:0.55, and send the raw material into the evaporator for the initial production The brine obtained by directly dissolving the carnallite ore extracted from the mine with fresh water is preheated to 140°C for evaporation and concentration, when the boiling point of the material liquid in the evaporation chamber rises to 26°C, the material is discharged, and the evaporated mother liquid is discharged to the carnallite for cooling and crystallization The end temperature of the cooling crystallization is 36°C. The slurry in the cooling crystallizer is sent to the thickener A. The overflow part of the thickener A is the old brine. The bottom flow of the thickener A is filtered and separated, and the obtained filt...

Embodiment 3

[0030] This embodiment includes the following steps:

[0031] (1) Evaporation and crystallization of carnallite: send the filtrate of the fine crystal slurry and the original halogen from step (5) into the evaporator according to the mass ratio of filtrate:original halogen=1:0.56, and send the raw material into the evaporator for the initial production The brine obtained by directly dissolving the carnallite ore extracted from the mine with fresh water is preheated to 142°C for evaporation and concentration, when the boiling point of the material liquid in the evaporation chamber rises to 25°C, the material is discharged, and the evaporated mother liquid is discharged to the carnallite for cooling and crystallization The end temperature of the cooling crystallization is 41°C. The slurry in the cooling crystallizer is sent to the thickener A. The overflow part of the thickener A is the old brine. The bottom flow of the thickener A is filtered and separated, and the obtained filt...

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

No PUM Login to View More

Abstract

The invention discloses a method for producing potassium chloride by adopting carnallite hot-melt brine. The method disclosed by the invention comprises the following steps of: (1) evaporating and crystallizing carnallite; (2) preparing a well mining injection agent and mining; (3) decomposing and crystallizing; (4) preparing agricultural-grade KCl; and (5) preparing industrial-grade KCl. According to the method, based on the decomposing and crystallizing characteristics of carnallite, KCl with thick crystal particles and KCl with thin crystal particles are processed by adopting different processes, so that the agricultural-grade and industrial-grade KCl products are obtained and the diversification of the products is realized; the process provided by the invention is low in overall energy consumption; by adopting the way of dissolving ores with a thermal injection agent, the mining rates of sodium chloride and magnesium chloride are greatly reduced during production of potassium chloride, so that the method disclosed by the invention has the advantages of saving production cost and achieving good comprehensive benefits.

Description

technical field [0001] The invention relates to a method for producing potassium chloride by using carnallite hot-dissolved brine, in particular to a method for producing different grades of potassium chloride by using underground carnallite mine hot-dissolved brine. Background technique [0002] At present, the production of potassium chloride fertilizer mainly uses soluble potassium salt ore carnallite as raw material. The main production methods for producing potassium chloride from carnallite ore in China are: cold decomposition-flotation method, cold decomposition-hot melt crystallization method, reverse flotation-cold crystallization method, and rate-controlled decomposition method for desodiumization with halogen, etc. Carnallite ores from salt lakes are generally mined in the open pit or from beach-dried salt fields, and the above methods are more suitable for preparing potassium chloride. For deep underground carnallite mines, the cost of open-pit mining is too hig...

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
IPC IPC(8): C01D3/08
Inventor 冯跃华戴斌联刘小力陈伟来杨能红潘友明孙成高
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com