[Soda ash knowledge] Daily question (158) 2010.3.20

The difference between the total chlorine in the carbonation solution and the total chlorine in the filtered mother liquor is called the filtered mother liquor chlorine difference. Reasons: 1. The amount of washing water entering the filtered mother liquor is large, so the mother liquor chlorine difference is large; 2. The salt content of the washing water is too high; 3. The alkali tank fluctuates greatly.

What is the filtration difference of filtration mother liquor? What are the reasons for the large filter difference? Answer: The difference between the total chlorine in the carbonation extract solution and the total chlorine in the filtered mother liquor is called the chlorine difference in the filtered mother liquor. Reasons: ① If the amount of washing water entering the filtered mother liquor is large, the chlorine difference in the mother liquor will be large. ； ②The salt content in the wash water is too high; ③The alkali tank fluctuates greatly.

The fluid in a liquid-solid or gas-solid mixture is forced to pass through the porosity, and the filter medium intercepts the suspended solid particles in it, thereby achieving the separation of the mixture. It is a unit operation belonging to the hydrodynamic process. The filtration of liquid-solid mixture is carried out under the action of pressure difference (including pressure difference caused by gravity) or centrifugal force. The mixture to be filtered is called slurry, the clear liquid passing through the filter medium is called filtrate, and the trapped solid particle layer is called filter cake. The filtration of gas-solid mixture is generally carried out under the action of pressure difference. The purpose of filtration operations is sometimes to obtain clarified fluids, such as lubricating oil or air filtration ； Sometimes it is to obtain suspended solid particles, such as separating crystal products from mother liquor during crystallization. ； Sometimes it's both. 　　Filtration Methods Depending on the driving force of the process, filtration can be divided into: ①Gravity filtration, the operating driving force is the liquid column static pressure of the suspension itself, which generally does not exceed 50kPa. This method is only suitable for processing slurries with large particle size and low content. ； ②Pressure filtration uses a pump or other means to pressurize the filter slurry, which can produce a higher operating pressure, generally up to 500kPa or more, and can effectively handle filter slurries that are difficult to separate. ； ③Vacuum filtration, vacuum is drawn on the bottom side of the filter medium, and the pressure difference generated usually does not exceed 85kPa. It is suitable for filter slurries containing mineral particles or crystal particles, and is convenient for washing the filter cake. ； ④For centrifugal filtration, the operating pressure is the centrifugal force generated by the filter slurry layer, which facilitates washing of the filter cake. The resulting filter cake has a small liquid content and is suitable for filtration of crystalline materials and fiber materials. There are many types of filtration equipment. Machines that implement gravity filtration, pressure filtration and vacuum filtration are usually called filters. ； The machine that performs centrifugal filtration is called a centrifugal filter. 　　According to the mechanism of filter media intercepting solid particles, it can be divided into surface filtration and depth filtration. The former is widely used in chemical production. ； The latter is less commonly used. 　　①Surface filtration uses the surface of the filter medium or the surface of the filter cake generated during the filtration process to intercept solid particles and separate the solid from the liquid. This kind of filtration can only remove particles with a particle size larger than the pore diameter of the filter cake, but it does not require that the pore diameter of the filter medium must be smaller than the diameter of the trapped particles. Under normal circumstances, at the beginning of filtration, a small amount of particles smaller than the diameter of the media channel will pass through the media and mix into the filtrate, but the particles will soon undergo a bridging phenomenon at the entrance of the media channel (Figure 1), causing the small particles to be blocked and deposited on the surface of the media to form a filter cake. At this time, it is the filter cake that actually intercepts particles, and the filter medium only plays the role of supporting the filter cake. However, when the particle content of the suspension is too small to form a filter cake, the solid particles can only be separated from the liquid by interception by the filter medium. ； At this time, only particles larger than the diameter of the media pores can be removed from the liquid.

What is the filtration difference of filtration mother liquor? What are the reasons for the large filter difference? Answer: The difference between the total chlorine in the carbonation extract solution and the total chlorine in the filtered mother liquor is called the chlorine difference in the filtered mother liquor. reason: ①If the amount of washing water entering the filtered mother liquor is large, the chlorine difference in the mother liquor will be large. ； ②Wash water contains too much salt ； ③The lye tank fluctuates greatly. 1# steinback

1# steinback The difference between the total chlorine in the carbonation extraction solution and the total chlorine in the filtered mother liquor is called the chlorine difference of the filtered mother liquor. reason: 1. If a large amount of washing water enters the filtered mother liquor, the chlorine difference in the mother liquor will be large. 2. The salt content of the washing water is too high. 3. The lye tank fluctuates greatly.

The difference between the total chlorine in the carbonation extract liquid and the total chlorine in the filtered mother liquor is called the difference of the filtered mother liquor. reason: 1. If a large amount of washing water enters the filtered mother liquor, the chlorine difference in the mother liquor will be large. 2. The salt content of the washing water is too high. 3. The lye tank fluctuates greatly.

The difference between the total chlorine in the carbonation extract solution and the total chlorine in the filtered mother liquor is called the chlorine difference in the filtered mother liquor. reason: A． If the amount of washing water entering the filtered mother liquor is large, the chlorine difference in the mother liquor will be large. ； B. Wash water contains too much salt ； C. The lye tank fluctuates greatly.

The difference between the total chlorine in the carbonation take-out solution and the total chlorine in the filtered mother liquor is called the chlorine difference in the filtered mother liquor.； reason: 1. If the amount of washing water entering the filtered mother liquor is large, the chlorine difference in the mother liquor will be large. ； 2. Wash water contains too much salt ； 3. The lye tank fluctuates greatly.

The fluid in a liquid-solid or gas-solid mixture is forced to pass through the porosity, and the filter medium intercepts the suspended solid particles in it, thereby achieving the separation of the mixture. It is a unit operation belonging to the hydrodynamic process. The filtration of liquid-solid mixture is carried out under the action of pressure difference (including pressure difference caused by gravity) or centrifugal force. The mixture to be filtered is called slurry, the clear liquid passing through the filter medium is called filtrate, and the trapped solid particle layer is called filter cake. The filtration of gas-solid mixture is generally carried out under the action of pressure difference. The purpose of filtration operations is sometimes to obtain clarified fluids, such as lubricating oil or air filtration ； Sometimes it is to obtain suspended solid particles, such as separating crystal products from mother liquor during crystallization. ； Sometimes it's both. 　　Filtration Methods Depending on the driving force of the process, filtration can be divided into: ①Gravity filtration, the operating driving force is the liquid column static pressure of the suspension itself, which generally does not exceed 50kPa. This method is only suitable for processing slurries with large particle size and low content. ； ②Pressure filtration uses a pump or other means to pressurize the filter slurry, which can produce a higher operating pressure, generally up to 500kPa or more, and can effectively handle filter slurries that are difficult to separate. ； ③Vacuum filtration, vacuum is drawn on the bottom side of the filter medium, and the pressure difference generated usually does not exceed 85kPa. It is suitable for filter slurries containing mineral particles or crystal particles, and is convenient for washing the filter cake. ； ④For centrifugal filtration, the operating pressure is the centrifugal force generated by the filter slurry layer, which facilitates washing of the filter cake. The resulting filter cake has a small liquid content and is suitable for filtration of crystalline materials and fiber materials. There are many types of filtration equipment. Machines that implement gravity filtration, pressure filtration and vacuum filtration are usually called filters. ； The machine that performs centrifugal filtration is called a centrifugal filter. 　　According to the mechanism of filter media intercepting solid particles, it can be divided into surface filtration and depth filtration. The former is widely used in chemical production. ； The latter is less commonly used. 　　①Surface filtration uses the surface of the filter medium or the surface of the filter cake generated during the filtration process to intercept solid particles and separate the solid from the liquid. This kind of filtration can only remove particles with a particle size larger than the pore diameter of the filter cake, but it does not require that the pore diameter of the filter medium must be smaller than the diameter of the trapped particles. Under normal circumstances, at the beginning of filtration, a small amount of particles smaller than the diameter of the media channel will pass through the media and mix into the filtrate, but the particles will soon undergo a bridging phenomenon at the entrance of the media channel (Figure 1), causing the small particles to be blocked and deposited on the surface of the media to form a filter cake. At this time, it is the filter cake that actually intercepts particles, and the filter medium only plays the role of supporting the filter cake. However, when the particle content of the suspension is too small to form a filter cake, the solid particles can only be separated from the liquid by interception by the filter medium. ； At this time, only particles larger than the diameter of the media pores can be removed from the liquid.

The difference between the total chlorine in the carbonation extract solution and the total chlorine in the filtered mother liquor is called the chlorine difference in the filtered mother liquor. Reasons: 1) If the amount of washing water entering the filtered mother liquor is large, the chlorine difference in the mother liquor will be large; 2) The salt content of the washing water is too high; 3) The alkali tank fluctuates greatly.