In recent years, the profitability of the coal industry has improved and the quality of economic operations has continued to improve. The industry has made new breakthroughs in vigorously developing coal washing and processing, and strengthening the clean production and utilization of coal. According to data provided by the China Coal Industry Association, the total amount of raw coal washed into the country increased from 370 million tons in 2000 to 850 million tons in 2006, and the washing rate increased from 25.9 in 2000 to 35.7 in 2006. The comprehensive utilization rate of wastes such as coal gangue and coal slime increased from 42 in 2000 to 53 in 2005. By the end of 2006, more than 300 coal gangue, coal slime, gas, and blast furnace gas power plants have been built nationwide, with a total installed capacity of 12 million kilowatts and nearly 90 million tons of low calorific value fuel. In 2006, the national coal mine gas extraction reached 3.2 billion cubic meters, an increase of 2.6 billion cubic meters compared with 2000.
While making great progress, the coal industry still has problems such as low coal mine resource recovery rate, low raw coal washing rate, and backward technical equipment. The enterprises participating in the meeting said that they will speed up the development of recycling economy, increase input to promote energy-saving emission reduction technology transformation, development and application of comprehensive utilization of coal resources and clean coal technology, and further improve the efficiency of coal resource utilization.
In the investment casting industry, steel castings are the most used castings in the manufacturing industry, and are widely used in equipment, agricultural machinery, machining, and automobile industries. Metal castings can produce parts with complex shapes, but there are also requirements for the design of the product structure. In the case of meeting the requirements of use, it should also try to comply with the casting process. For example, in the structural design, care should be taken not to have thin walls, which may easily lead to dissatisfaction with pouring or product deformation; for example, try not to have sharp corners, try to use radian transitions; and try not to appear small and deep blind holes, It will cause great trouble for foundry sand cleaning. Of course, there are many other structural problems. We will improve and optimize the product structure according to the customer's drawings without changing the customer's functional use, so as to maximize the product qualification rate and production efficiency. In some cases where the structure cannot be changed, we will also perform some follow-up processing after casting according to actual problems, so that the expected results can also be achieved.
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