Method of producing potassium chloride from reverse flotation tailings of carnallite

A carnallite and reverse flotation technology, applied in the direction of alkali metal chloride, etc., can solve the problems of large water consumption, resource waste, and environmental pollution, and achieve the effects of increasing potassium yield, improving utilization rate, and reducing potassium loss

Inactive Publication Date: 2013-08-14
CHANGSHA DESIGN & RES INST OF CHEM IND MIN +1
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the reverse flotation cold crystallization device for the production of potassium chloride from carnallite mines in China has reached a maximum annual output of 2 million tons of KCl. This process is designed to produce 1.2 tons of KCl with a mass fraction of about 7% for every ton of KCl produced. The flotation tailings waste salt is produced. For this kind of potassium-containing waste salt, there is currently no suitable production device and production process for processing and recycling, so it is discarded and unused, which not only causes serious waste of resources, but also affects normal production and pollution due to long-term accumulation. surroundings
Chinese patent 200610137218.7 discloses a method for recovering potassium chloride from abandoned mines in salt lakes, but the waste salt in salt lakes referred to by this method refers to low-grade potassium-containing waste salts that cannot enter the flotation process. Decompose completely, remove impurities, adjust the composition and recrystallize carnallite, which consumes a lot of water and has a long process flow. At the same time, it cannot be combined with the reverse flotation process in the actual production process of the salt lake. Therefore, it is difficult to apply it to actual production. middle

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

[0015] This embodiment includes the following steps:

[0016] (1) Decomposition of tailings: the reverse flotation tailings slurry with a mass fraction of potassium of 7.2% is introduced into the reaction tank, fresh water equivalent to 40% of the mass of the slurry is added to decompose for 18 minutes, and the mother liquor is separated by belt vacuum filtration. The filtrate is sent to the sodium salt pool of Yantian through the brine channel;

[0017] (2) Evaporation of salt field: Evaporate the filtrate from step (1) into the sodium salt pool to precipitate sodium chloride, and then guide the brine into the potassium rock salt pool for evaporation before the precipitation of potassium chloride, and the precipitated solid ore is potassium rock recovered from the tailings For salt mines, when the mass fraction of KCl in the liquid phase is ≤3.1%, and the mass fraction of Mg is ≥25.3%, the liquid phase is discharged into the carnallite pool for evaporation to obtain carnallit...

Embodiment 2

[0024] This embodiment includes the following steps:

[0025] (1) Decomposition of tailings: import the reverse flotation tailings slurry with a mass fraction of potassium of 6.9% into the reaction tank, add fresh water to decompose for 18 minutes according to 42% of the mass of the slurry, and use belt vacuum filtration to separate the mother liquor and filtrate Send it to the sodium salt pond of Yantian through the brine channel;

[0026] (2) Salt field evaporation: the filtrate introduced into the sodium salt pool in step (1) is evaporated to precipitate sodium chloride, and before potassium chloride is precipitated, the brine Import the potash salt pool for evaporation, and the precipitated solid ore is the potash salt ore recovered from the tailings. When the mass fraction of KCl in the liquid phase is ≤3.1% and the mass fraction of Mg is ≥25.3%, the liquid phase is discharged into the carnallite Pond evaporation, to obtain carnallite solid ore and old brine;

[0027] (...

Embodiment 3

[0033] This embodiment includes the following steps:

[0034] (1) Decomposition of tailings: import the reverse flotation tailings slurry with a mass fraction of potassium of 7.5% into the reaction tank, add fresh water to decompose for 14 minutes according to 38% of the mass of the slurry, and use belt vacuum filtration to separate the mother liquor and filtrate Send it to the sodium salt pond of Yantian through the brine channel;

[0035] (2) Evaporation of salt field: Evaporate the filtrate from step (1) into the sodium salt pool to precipitate sodium chloride, and then guide the brine into the potassium rock salt pool for evaporation before the precipitation of potassium chloride, and the precipitated solid ore is potassium rock recovered from the tailings For salt mines, when the mass fraction of KCl in the liquid phase is ≤3.1%, and the mass fraction of Mg is ≥25.3%, the liquid phase is discharged into the carnallite pool for evaporation to obtain carnallite solid ore an...

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 provides a method of producing potassium chloride from reverse flotation tailings of carnallite. The method comprises the following steps: (1) decomposition of the tailings; (2) evaporation in a salt pan; (3) hot melting; (4) separation; (5) triple tandem vacuum cold separation crystallization; and (6) separation and drying. According to the invention, a recovery rate of potassium in the salt pan is no less than 65%, a recovery rate of potassium in a processing factory is no less than 70%, the product of potassium chloride is no less than 98%, loss of potassium is small, yield of potassium is increased, and the utilization rate of the potassium resource in salt lakes can be effectively improved.

Description

technical field [0001] The invention relates to a method for producing potassium chloride, in particular to a method for producing potassium chloride from carnallite reverse flotation tailings. Background technique [0002] At present, the production of potassium chloride fertilizer in my country mainly uses soluble potassium salt ore carnallite and potassium halite as raw materials, and the main method for preparing potassium chloride is flotation. Flotation produces tailings, but the tailings still contain more or less potassium. The recovery of potassium from flotation tailings has always been a research topic that has attracted much attention in this field. The tailings produced by the process of producing potassium chloride by carnallite positive flotation is potassium-containing waste liquid. Chinese patent 200410073691.4 discloses a recovery method for potassium chloride in carnallite flotation tail liquid, which solves the problem of Potassium recovery from positive...

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 Patents(China)
IPC IPC(8): C01D3/08
Inventor 王兴富冯跃华朱金义卢志斌李辉林刘小力刘炳双戴斌联李中华潘友明何慧娟孙成高马斌
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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