Method and system for carrying out automatic solid-liquid continuous washing and separation

Abstract

The invention discloses a method and a system for carrying out automatic solid-liquid continuous washing and separation. The method comprises the following steps: inputting a washing solvent into a to-be-treated initial solid size by adopting an automatic flow control unit, thus obtaining a first mixed solution; inputting the first mixed solution into a separation or filter assembly, and separating, thus obtaining a liquid phase and a solid size; inputting the washing solvent into the solid size obtained through separation by adopting the automatic flow control unit, thus obtaining a second mixed solution; inputting the second mixed solution into a next separation or filter assembly, and separating again, thus obtaining the liquid phase and the solid size; repeating the operation for at least once, and testing the electrical conductivity or the pH (Potential of Hydrogen) value of the liquid phase which is obtained every time until the electrical conductivity or the pH value of the liquid phase is constant. According to the method disclosed by the invention, charging and discharging of the washing solvent and a powder-containing solid size can be controlled through a DSC (Dynamic Stability Control) system, continuous and automatic washing and solid-liquid separation of powder materials can be realized through programs such as a temperature control program of the system, and industrial automatic separation and washing can be easily realized.

Description

technical field [0001] The invention relates to a solid-liquid separation method, in particular to a continuous automatic solid-liquid continuous washing and separation method and system for powder materials, belonging to the technical field of solid-liquid separation. Background technique [0002] In recent years, with the continuous development of material technology, the material preparation process has also been continuously improved. Among them, washing and separation technology is a very important link in the material preparation process. Traditional solid-liquid separation devices for powder materials include centrifugal equipment such as centrifugal separators and filtering equipment such as centrifugal filters, vacuum filters, pressure filters, and plate-and-frame filters. These devices play a very critical role in the solid-liquid separation process in the preparation of powder materials. However, when the filter equipment is used to separate powder materials, it...

AI Technical Summary

Problems solved by technology

However, when the filter equipment is used to separate powder materials, it usually requires a lot of pressure, so the energy consumption is too high; in addition, when the filter equipment is small in size or slurry, it is easy to have a phenomenon of permeation, so the requirements for the filter membrane It is very high, which will increase the production cost of the enterprise; in addition, the water content of the powder material obtained after filtering by the filtration equipment is still high, and it is difficult to achieve complete separation of solid and liquid

When the centrifugal separator needs a high centrifugal speed for powder materials with low separation coefficients (such as graphene materials with small mass, small-sized nanomaterials, etc.), high-speed centrifuges are not only expensive, but also usually A refrigeration system is required, which will not only increase energy consumption, but also be limited by many product technical indicators

In addition, centrifugal separation and filtration separation generally use centrifuges, plate and frame filter presses, vacuum filters, etc. These filtration methods are all separated by solvent dispersion after centrifugation, that is, a one-pot separation method, such as Patents CN104307369A, CN103508473A, etc., are difficult to achieve continuous separation, and there are disadvantages such as high energy consumption, long time consumption, difficult washing, and difficulty in realizing automation and continuous production, which limits the industrial continuous and automatic production of powder materials

[0003] In addition, in the traditional production process of powder materials, due to the practical problem that powder materials are difficult to separate, it is difficult to wash the product after a solid-liquid separation, so there is often a problem of low purity of the obtained product

Images