Utilize potassium mixed salt to prepare the method for potassium chloride

A technology of potassium mixed salt and potassium chloride, which is applied in chemical instruments and methods, purification of alkali metal chlorides and alkali metal halides, and can solve problems such as staying in tailings, high risk of operation, and low conversion efficiency , to achieve the effect of maintaining the water flow rate, improving the separation yield and preventing excessive consumption
CN106430248BActive Publication Date: 2018-03-20QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
4 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
Publication Date
2018-03-20

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a method for preparing potassium chloride by utilizing potassium mixed salt. The method comprises the steps that a reverse flotation process is adopted to remove sodium chloride in the potassium mixed salt, and a tailing is obtained; the tailing is dissolved in water, and solid-liquid separation is performed to obtain a tailing solution; a section of nanofiltration step is executed, wherein a nanofiltration membrane system is adopted to conduct a section of nanofiltration treatment on the tailing solution to obtain a section of concentrated water and a section of produced water and comprises a first nanofiltration membrane module and a first concentrated water tank and a first produced water tank connected to the first nanofiltration membrane module, the section of concentrated water is stored in the first concentrated water tank, and the section of produced water is stored in the first produced water tank; evaporative crystallization is conducted on the section of produced water to obtain the potassium chloride. The invention provides a novel method for producing potassium chloride by using potassium mixed salt as a raw material. The method has the advantages of being simple in process, high in product purity and high in yield.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The invention belongs to the technical field of inorganic salt preparation, and specifically relates to a method for preparing potassium chloride by using potassium mixed salt. Background technique

[0002] Potassium is one of the three essential nutrient elements (nitrogen, phosphorus, and potassium) for the growth of crops. Among them, potassium chloride is the most important type of potassium fertilizer, accounting for more than 90% of the total amount of potassium fertilizer. China is a country with serious soil potassium deficiency. With the continuous increase in crop yields and the use of nitrogen and phosphate fertilizers, the amount of potassium removed from the soil by crops has gradually increased, and the amount of potassium removed from the soil by the crops has been increased in the form of organic fertilizer, straw returning to the field, and potassium-containing fertilizer The amount of potassium returned to the soil cannot make up for the a...

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