The treated clear liquid is sent to the salt-salting section for recycling, and the dry slag is transported to fill the land for deep burial, which not only reduces the salt consumption of caustic soda production, but also solves the pollution caused by salt sludge discharge. The application of the chamber filter press in the salt mud treatment process of Chongqing Tianyuan Company is introduced.
1 The main component of the salt mud is a gray-white suspension of the salt sludge discharged from the bottom of the three-layer washing mud bucket, and the mass fraction of the solid matter contained therein is 10% to 15%. From the chemical composition of the salt mud, it is a substance with a high content of Ca2+ and Mg2+. The salt mud composition of different kinds of raw salt is slightly different. The main components of the salt mud of Chongqing Tianyuan Company are shown in Table 1. The amount of salt mud produced has a lot to do with the content of raw salt impurities, the amount of brine and the production process. Generally, the production of 1t100% NaOH will produce 40~60kg (dry basis) salt mud, which is equivalent to 67~100kg of salt mud with 40% water content (after press dewatering). According to Chongqing Tianyuan Company's caustic soda production of 50,000 t / a, about 2500 t / a salt mud (dry basis), about 400 t / a salt sludge after dewatering (water content of 40%). In combination with the actual situation, the chlor-alkali enterprises can press and dewater the salt mud, and the dry slag can be used as a paving material for filling the pit. '
2-chamber filter press 2.1 Chamber filter press Introduction Chamber filter press is a batch-operated filter device for solid-liquid separation of various suspensions, with good separation effect, widely used in petroleum, chemical, Dyes, metallurgy, medicine, food and other industries. The machine is designed and manufactured by machine, electricity and liquid. It has reasonable structure, simple and reliable operation and convenient maintenance. It can realize automatic operation of filter plate pressing, feeding, filtering and washing. The filter plate is TPE elastomer without alkali. The glass fiber polypropylene is molded; the filter cloth is made of polypropylene material with good acid and alkali resistance; the whole structure is made of ductile iron castings, and has a long service life.
2.2 Chamber filter press press dewatering principle The filter part of the box filter press in Chongqing Tianyuan consists of a filter plate and a filter cloth. The filter plates and filter cloths arranged on the main beam in a certain order form a filter unit. - Filter chamber. Before the filter press, the slurry enters the filter chamber through the feed port on the thrust plate under the push of the feed pump; when the filter press is started, the slurry is subjected to solid-liquid separation by the pressure generated by the feed pump.
Due to the action of the filter cloth, the solid remains in the filter chamber to form a filter cake, and the filtrate is discharged from a water nozzle (bright flow) or an outlet valve (undercurrent). If the filter cake needs to be washed, the filter cake may be washed by washing water from the washing port on the thrust plate; if a filter cake having a lower water content is required, compressed air may be introduced from the washing port. Compressed air permeates the filter cake layer to remove some of the moisture from the filter cake.
2.3 Main technical parameters of the box filter press The box filter press of Chongqing Tianyuan is a kind of bright flow, filter cake washable filter press, and the feed position is medium feed. The main technical parameters (take XM40/800UK as an example) are as follows: filtration area, 40m2; filter plate, 39 pieces; total volume of filter chamber, 0.626m3; frame length, 4100mm; filter plate thickness, 60mm; filter cake thickness, 30mm Dimensions, 5156×1252×1200; feed aperture, 65mm; aperture of the liquid outlet (washing hole), 40mm; mass of the whole machine, 2850kg.
3 salt mud treatment process (1) salt mud treatment process [1] is as follows: the mass concentration of NaCl in the salt mud discharged from the Daoer clarification tank is 180-300g/L, and is washed by 3 layers of washing mud tank, recycling Among them is the NaCl component. When the Ï(NaCl) in the washed pale salt water is ≤15g/L, the salt mud at the bottom of the 3-layer washing mud bucket is driven into the salt mud barrel through the mud pump, and then pumped into the mixing drum to add steam to the barrel. And compressed air, temperature control at (35 ± 5) °C for slurry; then use the mud pump to drive into two filter presses (start feeding), when the feed pressure is stable at about 0.4MPa, stop feeding ( About 30min); start the clean water washing pump, wash the filter cake for 5-8 minutes, stop the washing when the filtrate from the outlet of the filter press is clear; then open the air valve of the filter press and blow dry the salt mud in the filter press When there is no filtrate out of the outlet of the filter press, turn off the inlet valve, stop the supply of gas, close the press valve, open the vent valve, and start to remove the salt cake (the main components of the filter cake are shown in Table 2). Pour into the salt mud filter cake bucket with the slag truck, remove the filter residue, collect the filtrate in the storage tank, and send it to the salt water bucket of the salting section to remove the salt.
4 Matters needing attention in actual operation XM40/800-UK chamber filter press adopts intermittent operation, reasonable structure, simple operation, good solid-liquid separation effect and long service life, which is an ideal filtering device. However, in the actual operation, the following three points should be noted: 1 When carrying and replacing the filter plate, the force should be appropriate to prevent collision, and it is strictly forbidden to beat to avoid cracking. The position of the filter plate must not be misplaced; the filter plate must not be removed without authorization to avoid accidents caused by insufficient cylinder stroke; when the filter plate breaks, it should be replaced in time, and can not be used continuously, so as not to cause other filter plates to rupture. 2 Before compacting the filter plate, the filter plates must be arranged neatly, close to the end of the thrust plate, and placed parallel to the thrust plate to avoid bending deformation of the main beam due to improper placement of the filter plate. 3 The choice of filter cloth is very important. The performance of the filter cloth directly affects the service life and filtration effect of the filter press. In order to achieve an ideal filtration effect and speed, it is necessary to select according to the particle size, density, viscosity, chemical composition and filtration process conditions of the material.
1 The main component of the salt mud is a gray-white suspension of the salt sludge discharged from the bottom of the three-layer washing mud bucket, and the mass fraction of the solid matter contained therein is 10% to 15%. From the chemical composition of the salt mud, it is a substance with a high content of Ca2+ and Mg2+. The salt mud composition of different kinds of raw salt is slightly different. The main components of the salt mud of Chongqing Tianyuan Company are shown in Table 1. The amount of salt mud produced has a lot to do with the content of raw salt impurities, the amount of brine and the production process. Generally, the production of 1t100% NaOH will produce 40~60kg (dry basis) salt mud, which is equivalent to 67~100kg of salt mud with 40% water content (after press dewatering). According to Chongqing Tianyuan Company's caustic soda production of 50,000 t / a, about 2500 t / a salt mud (dry basis), about 400 t / a salt sludge after dewatering (water content of 40%). In combination with the actual situation, the chlor-alkali enterprises can press and dewater the salt mud, and the dry slag can be used as a paving material for filling the pit. '
2-chamber filter press 2.1 Chamber filter press Introduction Chamber filter press is a batch-operated filter device for solid-liquid separation of various suspensions, with good separation effect, widely used in petroleum, chemical, Dyes, metallurgy, medicine, food and other industries. The machine is designed and manufactured by machine, electricity and liquid. It has reasonable structure, simple and reliable operation and convenient maintenance. It can realize automatic operation of filter plate pressing, feeding, filtering and washing. The filter plate is TPE elastomer without alkali. The glass fiber polypropylene is molded; the filter cloth is made of polypropylene material with good acid and alkali resistance; the whole structure is made of ductile iron castings, and has a long service life.
2.2 Chamber filter press press dewatering principle The filter part of the box filter press in Chongqing Tianyuan consists of a filter plate and a filter cloth. The filter plates and filter cloths arranged on the main beam in a certain order form a filter unit. - Filter chamber. Before the filter press, the slurry enters the filter chamber through the feed port on the thrust plate under the push of the feed pump; when the filter press is started, the slurry is subjected to solid-liquid separation by the pressure generated by the feed pump.
Due to the action of the filter cloth, the solid remains in the filter chamber to form a filter cake, and the filtrate is discharged from a water nozzle (bright flow) or an outlet valve (undercurrent). If the filter cake needs to be washed, the filter cake may be washed by washing water from the washing port on the thrust plate; if a filter cake having a lower water content is required, compressed air may be introduced from the washing port. Compressed air permeates the filter cake layer to remove some of the moisture from the filter cake.
2.3 Main technical parameters of the box filter press The box filter press of Chongqing Tianyuan is a kind of bright flow, filter cake washable filter press, and the feed position is medium feed. The main technical parameters (take XM40/800UK as an example) are as follows: filtration area, 40m2; filter plate, 39 pieces; total volume of filter chamber, 0.626m3; frame length, 4100mm; filter plate thickness, 60mm; filter cake thickness, 30mm Dimensions, 5156×1252×1200; feed aperture, 65mm; aperture of the liquid outlet (washing hole), 40mm; mass of the whole machine, 2850kg.
3 salt mud treatment process (1) salt mud treatment process [1] is as follows: the mass concentration of NaCl in the salt mud discharged from the Daoer clarification tank is 180-300g/L, and is washed by 3 layers of washing mud tank, recycling Among them is the NaCl component. When the Ï(NaCl) in the washed pale salt water is ≤15g/L, the salt mud at the bottom of the 3-layer washing mud bucket is driven into the salt mud barrel through the mud pump, and then pumped into the mixing drum to add steam to the barrel. And compressed air, temperature control at (35 ± 5) °C for slurry; then use the mud pump to drive into two filter presses (start feeding), when the feed pressure is stable at about 0.4MPa, stop feeding ( About 30min); start the clean water washing pump, wash the filter cake for 5-8 minutes, stop the washing when the filtrate from the outlet of the filter press is clear; then open the air valve of the filter press and blow dry the salt mud in the filter press When there is no filtrate out of the outlet of the filter press, turn off the inlet valve, stop the supply of gas, close the press valve, open the vent valve, and start to remove the salt cake (the main components of the filter cake are shown in Table 2). Pour into the salt mud filter cake bucket with the slag truck, remove the filter residue, collect the filtrate in the storage tank, and send it to the salt water bucket of the salting section to remove the salt.
4 Matters needing attention in actual operation XM40/800-UK chamber filter press adopts intermittent operation, reasonable structure, simple operation, good solid-liquid separation effect and long service life, which is an ideal filtering device. However, in the actual operation, the following three points should be noted: 1 When carrying and replacing the filter plate, the force should be appropriate to prevent collision, and it is strictly forbidden to beat to avoid cracking. The position of the filter plate must not be misplaced; the filter plate must not be removed without authorization to avoid accidents caused by insufficient cylinder stroke; when the filter plate breaks, it should be replaced in time, and can not be used continuously, so as not to cause other filter plates to rupture. 2 Before compacting the filter plate, the filter plates must be arranged neatly, close to the end of the thrust plate, and placed parallel to the thrust plate to avoid bending deformation of the main beam due to improper placement of the filter plate. 3 The choice of filter cloth is very important. The performance of the filter cloth directly affects the service life and filtration effect of the filter press. In order to achieve an ideal filtration effect and speed, it is necessary to select according to the particle size, density, viscosity, chemical composition and filtration process conditions of the material.
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