Continuous and semi-continuous mining technology has become the main trend of modern surface mines in the world. According to the deposit characteristics of coal basin in China and Chinese situation,this paper discuss...Continuous and semi-continuous mining technology has become the main trend of modern surface mines in the world. According to the deposit characteristics of coal basin in China and Chinese situation,this paper discussed the new semi-continuous technology── shovel - transfer wagon-belt conveyor and its application prospect in large surface coal mines in China.展开更多
This article briefly describes the major patents domestic and the abroad, and the current situation and achievements of FCC stripping technology in China. The developing trend of FCC stripping technology is presented,...This article briefly describes the major patents domestic and the abroad, and the current situation and achievements of FCC stripping technology in China. The developing trend of FCC stripping technology is presented, including further developments of FCC stripper to improve unit performance, combination of the stripper and pre stripper within disengager to form a complete high efficiency FCC stripping system. In addition to high efficiency, simple structure and easiness of installation and maintenance for a new FCC stripper are all of consideration.展开更多
In order to avoid the loss of ammonia during solar drying of stored urine, low-tech stripping is suggested as a pretreatment process for ammonia recovery. The mass transfer of ammonia from stored urine with an initial...In order to avoid the loss of ammonia during solar drying of stored urine, low-tech stripping is suggested as a pretreatment process for ammonia recovery. The mass transfer of ammonia from stored urine with an initial pH of about 9 was tested in a simple closed vessel operated at 72°C, 74°C and 85°C. The specific urine/gas interface was 16.97 m-1. For ammonia absorption, a beaker with sulfuric acid was positioned in the gas phase of the container. After keeping the stored urine for 73 h at 85°C, the concentration of free ammonia (NH3) was reduced by more than 99%, and the pH of the stored urine decreased to 6.4 due to ammonia volatilization. Total ammonia (NH3+ NH4+) concentration was reduced by only 83% in the same period. At lower temperatures, the process was slower. Required treatment time can be reduced when specific gas/liquid interface is increased. Because it is known that water can be heated in solar boxes to temperatures above 90°C, this simple stripping apparatus is feasible to be operated with solar energy in remote areas with suitable climatic conditions where no electric power is available. As the area demand for solar “low-tech stripping” is less than 1 m2 per capita, this process can be looked at as a suitable pretreatment of stored urine prior to solar evaporation.展开更多
The status quo and future development trend of Baosteel continuous casting （CC） technology is introduced. Since its commissioning over ten years ago, Baosteel＇ s CC process has made great progress. The construction...The status quo and future development trend of Baosteel continuous casting （CC） technology is introduced. Since its commissioning over ten years ago, Baosteel＇ s CC process has made great progress. The construction of Baosteel CC research and development base is also introduced. Two aspects of the future CC technology development in Baosteel are stressed. One is to follow the advanced CC technology and solve problems in real production, making full use of pilot plants, while the other is to integrate the present CC technology and make technical breakthroughs in engineering proiects.展开更多
The development trend of coated and plated technology for continuous strip steels,which include hot dip plating,electroplating,organic coating and vacuum plating technology,were summarized.
文摘Continuous and semi-continuous mining technology has become the main trend of modern surface mines in the world. According to the deposit characteristics of coal basin in China and Chinese situation,this paper discussed the new semi-continuous technology── shovel - transfer wagon-belt conveyor and its application prospect in large surface coal mines in China.
文摘This article briefly describes the major patents domestic and the abroad, and the current situation and achievements of FCC stripping technology in China. The developing trend of FCC stripping technology is presented, including further developments of FCC stripper to improve unit performance, combination of the stripper and pre stripper within disengager to form a complete high efficiency FCC stripping system. In addition to high efficiency, simple structure and easiness of installation and maintenance for a new FCC stripper are all of consideration.
文摘In order to avoid the loss of ammonia during solar drying of stored urine, low-tech stripping is suggested as a pretreatment process for ammonia recovery. The mass transfer of ammonia from stored urine with an initial pH of about 9 was tested in a simple closed vessel operated at 72°C, 74°C and 85°C. The specific urine/gas interface was 16.97 m-1. For ammonia absorption, a beaker with sulfuric acid was positioned in the gas phase of the container. After keeping the stored urine for 73 h at 85°C, the concentration of free ammonia (NH3) was reduced by more than 99%, and the pH of the stored urine decreased to 6.4 due to ammonia volatilization. Total ammonia (NH3+ NH4+) concentration was reduced by only 83% in the same period. At lower temperatures, the process was slower. Required treatment time can be reduced when specific gas/liquid interface is increased. Because it is known that water can be heated in solar boxes to temperatures above 90°C, this simple stripping apparatus is feasible to be operated with solar energy in remote areas with suitable climatic conditions where no electric power is available. As the area demand for solar “low-tech stripping” is less than 1 m2 per capita, this process can be looked at as a suitable pretreatment of stored urine prior to solar evaporation.
文摘The status quo and future development trend of Baosteel continuous casting （CC） technology is introduced. Since its commissioning over ten years ago, Baosteel＇ s CC process has made great progress. The construction of Baosteel CC research and development base is also introduced. Two aspects of the future CC technology development in Baosteel are stressed. One is to follow the advanced CC technology and solve problems in real production, making full use of pilot plants, while the other is to integrate the present CC technology and make technical breakthroughs in engineering proiects.
文摘The development trend of coated and plated technology for continuous strip steels,which include hot dip plating,electroplating,organic coating and vacuum plating technology,were summarized.
