How to choose the filter press in the sewage treatment of the steel industry

First, the situation of the steel industry
In 2009, in the face of the once-in-a-century international financial crisis, countries and international organizations around the world implemented a series of economic stimulus policies. Since the second quarter, the world economy has undergone positive changes, financial markets are basically stable, stock markets and international primary product prices. First to rise. However, the unemployment rate in major countries remains high, overcapacity, low operating rates, trade protection upgrades, and the recovery of the world economy is slow.

In response to the positive impact of the international financial crisis package, China's economy has curbed the momentum of a sharp decline, showing a good momentum of stabilization and recovery. It is estimated that the annual GDP will increase by about 8.5%. In 2010, the world economy will experience a slow recovery, and external demand is expected to stop falling.

In the recent winter, due to the decrease in temperature, the construction load in the north decreased, the demand for construction steel declined, and the domestic steel price ended the trend of nearly two months. There was a slight adjustment. According to the business forecast of the Ministry of Commerce, last week (December 7) By the 13th, the national steel price fell by 0.3% from the previous week, and fell slightly for two consecutive weeks. However, in the real estate market, the rapid recovery, the demand for automobiles and other industries are driving, and the cost of iron ore and coke is on the rise. It is expected that in the first quarter of next year, China's steel prices will fluctuate and the overall trend will tend to rise.

Steel exports are mainly based on two factors: 1. World steel demand is strong. 2. Domestic and international spreads appear. In 2009, international demand was weak, and China's steel prices were higher than international prices, so exports fell sharply by more than 60%. In 2010, the world's steel consumption demand in addition to China is expected to rise by 8.5%, similar to the golden period of exports in 2006 and 2007; in addition, the price advantage of domestic steel exports will once again show up, these two points will stimulate the recovery of exports from the low level next year. However, considering the existence of trade friction, we expect that it is difficult for exports to return to a historically good level (net exports are close to 50 million tons/year), and net exports are expected to return to around 20 million tons next year.

Second, the steel industry sewage treatment problems
After 60 years of development, China's steel industry, especially in the past 30 years of reform and opening up, has made great progress and achieved world-renowned achievements: the increase in steel production has accelerated, the technical level has improved significantly, and the product structure has been continuously adjusted to become a veritable Large steel country. However, the steel industry is also an industry with high energy consumption, high water consumption and high pollution, and is a major source of energy, resource consumption and pollutant emissions. At present, the energy consumption of the steel industry accounts for more than 10% of the total energy consumption in the country. The water consumption of the steel industry accounts for about 9% of the national industrial water consumption; most of the wastewater discharged from the steel industry is alkaline and has a certain viscosity. It has brought great difficulties to wastewater treatment; the energy consumption and water consumption indicators of China's steel industry are much higher than the advanced level of foreign countries. Therefore, the sewage treatment problem in the steel industry will be a very serious problem.

Third, the new demand for filter press
In the steel industry sewage treatment, most of them use a filter press . Industrial steel plant sludge sewage treatment equipment has the requirements of corrosion resistance and wear resistance for the use of filter press. Therefore, the filter press used by Zui for steel sewage treatment is a reinforced polypropylene plate filter press. However, with the country's higher requirements for environmental protection and less processing costs for enterprises, the problem of reinforcing polypropylene plate filter plate filter press is also obvious: 1. poor sealing performance, high water content of filter medium, mud cake in transportation process There is a problem in the middle; 2. After changing to the assembled diaphragm press plate, the airbag is not sealed, the air leakage phenomenon is serious, the energy consumption is high, the mud cake is not easy to fall off; 3. The mud storage bucket does not store mud; 4. The capillary during the filtration process The phenomenon cannot be solved. Therefore, many industries such as the steel industry and the chemical industry are expecting more suitable filter presses to be launched.

Fourth, how to choose the right filter press
With the increase of national environmental protection efforts, the working environment and requirements of local governments and ordinary people have increased. The increasing competitiveness of the steel industry is becoming more and more stringent in terms of efficiency, energy consumption and energy saving. 1. How to use the sewage discharge, energy saving and consumption reduction of the large-scale use of sewage; The facilities are complete, so that the sewage treatment is fast, simple and easy to use.
The heart of the filter press – the filter plate is an important component that directly affects the use and service life of the filter press. The use of polypropylene filter plates is poor, and the assembled diaphragm plates cannot meet the requirements. Only fully enclosed air bag diaphragm plates can meet the requirements for use. Full airbag filter press features:
1. Using hydraulic compression, Zui large compression pressure 22Mpa, using electric contact pressure gauge and hydraulic control check valve to achieve automatic pressure;
2.zui large filtration pressure: 0.8Mpa for the van type and 0.5Mpa for the plate and frame type, ensuring a good condition for the formation of the filter cake, and performing pressure filtration;
3. Filter plate temperature resistance: normal 0~80 °C, Zui height 115 °C.
4. There are two types of unloading methods: manual unloading and automatic unloading. The automatic unloading method uses a hydraulic device as a power mechanism;
5. The automatic airbag filter press adopts PLC programming automatic control, which can realize remote control;
6. It can be equipped with automatic liquid collecting flap mechanism: automatic collection of filtrate and filter cloth washing water leaking due to capillary phenomenon of filter cloth;
7. It can be equipped with auxiliary discharge mechanism - filter cloth varicose mechanism or filter cloth strutting mechanism to facilitate automatic peeling of the filter cake from the filter cloth;
8. Full diaphragm airbag plate, using more than 100,000 times of inlet and outlet.
8. Simple operation, convenient maintenance, safe and reliable.

According to the above, the steel industry can only use this filter press to process sewage quickly, efficiently and simply. Therefore, the full airbag filter press has become the first choice for sewage treatment equipment in the modern steel industry.