Low-temperature pyrolysis energy-saving reform
At present, the pyrolysis process is a major energy-consuming process for producing light magnesium carbonate and magnesium oxide from dolomite. This year, the Chinese calcium salt and magnesium salt branch of the China Inorganic Salt Industry Association organized relevant units to focus on the energy-saving transformation of the pyrolysis process and proposed that the original high-temperature pyrolysis was changed to a low-temperature pyrolysis scheme. It has been implemented in several companies, and the energy-saving effect is significant.
In April this year, Hebei Qiuqi County Magnesium Products Co., Ltd. held a number of related meetings in accordance with the requirements of energy conservation and emission reduction, discussed and sought for the company's development direction and the issue of “energy saving, consumption reduction, and emission reduction†and decided to invest 200,000 yuan to implement. The low-temperature pyrolysis energy-saving reconstruction project promoted by the Calcium and Magnesium Salt Branch will transform the energy-intensive pyrolysis process. They received the technical support from Prof. Hu Qingfu, group leader of the magnesium salt industry expert group, and Shijiazhuang Sayed Machinery Manufacturing Co., Ltd., and obtained funding loans from the county credit union. At present, the project has been successfully reconstructed. After the transformation, the pyrolysis temperature is reduced from 95°C to 105°C to 45°C to 60°C, and the boiler-fired coal has been reduced from 12 tons per day to 6 tons per day. Only the next one can save 1,800 tons of coal per year, reduce carbon dioxide emissions by more than 600 tons and reduce costs by 2 million yuan. Industrial waste was used to reduce the sources of pollution, and the total corporate profits increased by 3.7 million yuan annually.
Rotary kiln calcination technology
Most of the traditional inorganic salt calcination processes in China use box furnaces, which have high energy consumption. The consumption of magnesium oxide coal per ton is about 3 tons. Yuncheng Yaxing Environmental Protection Technology Co., Ltd. has repeatedly studied and tested and successfully mastered the rotary kiln calcination technology, which reduced the coal consumption per ton of magnesium oxide to 1.2 tons and achieved significant energy conservation and emission reduction.
Rotary kiln coal-fired coal adopts environment-friendly coal, which has a secondary combustion and high thermal efficiency. At the same time, the rotary kiln exhaust gas will be used in three stages. The first is to heat the waste heat steam boiler to provide steam for production, and then to make a two-stage heating hot water boiler to provide domestic hot water and heating. Because the waste heat is well utilized, the company's entire production, domestic use of steam and hot water, and winter heating are all supplied by rotary kiln waste heat boilers. The thermal efficiency of the rotary kiln is more than 80%, and the energy-saving effect is very significant.
Titanium-molybdenum nickel tube evaporator
At present, domestic magnesium salt companies mostly use copper tubes as evaporator heating tubes in the production of magnesium chloride, and the free bromine and free chlorine contained in the bromine waste liquid have a strong corrosive effect on the copper tubes due to the raw material of magnesium chloride production. The life of the heating tube is short, only 2 to 3 years. Lianyungang Yinhua Magnesium Production Company used titanium-molybdenum-nickel alloy pipe instead of copper pipe to achieve good results.
Titanium-Molybdenum-Nickel alloy has the characteristics of light specific gravity, high specific strength, and corrosion resistance. It is used as equipment material with excellent resistance to seawater and chloride corrosion and fluid flushing. After many years of trials and production operations, Yinhua Magnesium made it possible to use titanium-molybdenum-nickel alloy tubes as heating tubes for magnesium chloride evaporators. The service life can be up to 15 years, which is more than five times that of copper tubes. Although the unit price of titanium-molybdenum-nickel alloy pipe is much higher than that of copper pipe, the proportion of titanium-molybdenum-nickel alloy pipe is only half that of the copper pipe, and the specific strength is twice as high as that of the copper pipe. The titanium-molybdenum-nickel alloy pipe is used instead of the copper pipe. Magnesium chloride evaporators can use about 70% less material, and the total material cost only increases by about 75%.
The adoption of titanium-molybdenum-nickel alloy tube evaporator greatly prolongs the life of the equipment and the stable operation cycle of the production. It fundamentally eliminates the environmental pollution caused by the running of the equipment and the impact on the product quality, improves the production environment, and achieves energy saving. Emission reduction.
Rotary flash dryer
Nanfeng Chemical Group Co., Ltd. succeeded in adopting a rotary flash dryer instead of a fluidized bed dryer in the production of magnesium sulfate monohydrate.
Over the past few years, the company has been experimenting with laminar air drying, tower drying, and drum drying to produce monohydrate magnesium sulfate unsuccessfully. Later, fluidized bed drying was used to achieve stable production, but the energy consumption was high. Recently the company modified the drying equipment and used a rotary flash dryer instead of a fluidized bed dryer. The new drying equipment has the advantages of simple operation, large production capacity, and good energy-saving effect. In the production process, the company uses the hot air from the hot blast stove as a heat source to directly dry it, reducing heat loss. The cyclone dust collector is used to recover most of the materials, and then the bag dust collector is used to recover small dust. The dust removal effect achieves the environmental emission index. Compared with the original fluidized bed drying equipment, the coal consumption of the rotary flash dryer was reduced by 20% and the electricity consumption was reduced by 19%.
Production of Nano-Magnesium Hydroxide by Bubble Liquid Membrane
Guangdong Zhongshan Institute of Applied Chemistry recently developed a new method for producing nano magnesium hydroxide, the bubble liquid membrane method, which has the characteristics of low energy consumption and easy product separation.
The key equipment of this method is the bubble liquid film reactor, which uses a different stirrer than usual. It uses a bubbler-type disc stirrer to disperse the gas into uniform and fine bubbles, so that a sufficient amount of bubbles are generated in the reaction system. All the reaction liquids are divided into uniform and fine bubbles to form a sufficiently thin liquid film to constitute a nano reaction environment. Precipitation of the reactants, crystal nucleation, growth, and termination of the product, generation of nanoparticles, and the like are performed in the bubble liquid film. The process realizes rapid reaction at normal temperature and low energy consumption. The loose product has the characteristics of easy filtration, easy washing, and easy drying, and it solves the problem of difficult nanoparticle washing and high energy consumption for separation.
The technology has been designed to produce an annual output of 600 tons of magnesium hydroxide continuous reactor, can implement industrial-scale production, sophisticated equipment, low investment, easy to start, easy maintenance, low maintenance costs.
Using light powder as raw material process
At present, domestic production of light magnesium oxide and active magnesium oxide adopts dolomite carbonization method and ammonium bicarbonate brine method. Yuncheng Yaxing Environmental Protection Technology Co., Ltd. changes the traditional process and finds out a new energy-saving process using light fired powder as raw material.
The process uses light-fired powder as raw material for production. The unique technology is used to fully hydrate the light-burned powder, remove calcium and remove impurities, and produce magnesium hydroxide and then calcine to produce magnesium oxide. The biggest feature of this process is that the production coal consumption is greatly reduced, the unit coal consumption of the product can be reduced by about 3 tons, and the power consumption can be reduced by 250 kwh. The cost per ton of magnesium oxide can be reduced by around 3,000 yuan.
At present, the pyrolysis process is a major energy-consuming process for producing light magnesium carbonate and magnesium oxide from dolomite. This year, the Chinese calcium salt and magnesium salt branch of the China Inorganic Salt Industry Association organized relevant units to focus on the energy-saving transformation of the pyrolysis process and proposed that the original high-temperature pyrolysis was changed to a low-temperature pyrolysis scheme. It has been implemented in several companies, and the energy-saving effect is significant.
In April this year, Hebei Qiuqi County Magnesium Products Co., Ltd. held a number of related meetings in accordance with the requirements of energy conservation and emission reduction, discussed and sought for the company's development direction and the issue of “energy saving, consumption reduction, and emission reduction†and decided to invest 200,000 yuan to implement. The low-temperature pyrolysis energy-saving reconstruction project promoted by the Calcium and Magnesium Salt Branch will transform the energy-intensive pyrolysis process. They received the technical support from Prof. Hu Qingfu, group leader of the magnesium salt industry expert group, and Shijiazhuang Sayed Machinery Manufacturing Co., Ltd., and obtained funding loans from the county credit union. At present, the project has been successfully reconstructed. After the transformation, the pyrolysis temperature is reduced from 95°C to 105°C to 45°C to 60°C, and the boiler-fired coal has been reduced from 12 tons per day to 6 tons per day. Only the next one can save 1,800 tons of coal per year, reduce carbon dioxide emissions by more than 600 tons and reduce costs by 2 million yuan. Industrial waste was used to reduce the sources of pollution, and the total corporate profits increased by 3.7 million yuan annually.
Rotary kiln calcination technology
Most of the traditional inorganic salt calcination processes in China use box furnaces, which have high energy consumption. The consumption of magnesium oxide coal per ton is about 3 tons. Yuncheng Yaxing Environmental Protection Technology Co., Ltd. has repeatedly studied and tested and successfully mastered the rotary kiln calcination technology, which reduced the coal consumption per ton of magnesium oxide to 1.2 tons and achieved significant energy conservation and emission reduction.
Rotary kiln coal-fired coal adopts environment-friendly coal, which has a secondary combustion and high thermal efficiency. At the same time, the rotary kiln exhaust gas will be used in three stages. The first is to heat the waste heat steam boiler to provide steam for production, and then to make a two-stage heating hot water boiler to provide domestic hot water and heating. Because the waste heat is well utilized, the company's entire production, domestic use of steam and hot water, and winter heating are all supplied by rotary kiln waste heat boilers. The thermal efficiency of the rotary kiln is more than 80%, and the energy-saving effect is very significant.
Titanium-molybdenum nickel tube evaporator
At present, domestic magnesium salt companies mostly use copper tubes as evaporator heating tubes in the production of magnesium chloride, and the free bromine and free chlorine contained in the bromine waste liquid have a strong corrosive effect on the copper tubes due to the raw material of magnesium chloride production. The life of the heating tube is short, only 2 to 3 years. Lianyungang Yinhua Magnesium Production Company used titanium-molybdenum-nickel alloy pipe instead of copper pipe to achieve good results.
Titanium-Molybdenum-Nickel alloy has the characteristics of light specific gravity, high specific strength, and corrosion resistance. It is used as equipment material with excellent resistance to seawater and chloride corrosion and fluid flushing. After many years of trials and production operations, Yinhua Magnesium made it possible to use titanium-molybdenum-nickel alloy tubes as heating tubes for magnesium chloride evaporators. The service life can be up to 15 years, which is more than five times that of copper tubes. Although the unit price of titanium-molybdenum-nickel alloy pipe is much higher than that of copper pipe, the proportion of titanium-molybdenum-nickel alloy pipe is only half that of the copper pipe, and the specific strength is twice as high as that of the copper pipe. The titanium-molybdenum-nickel alloy pipe is used instead of the copper pipe. Magnesium chloride evaporators can use about 70% less material, and the total material cost only increases by about 75%.
The adoption of titanium-molybdenum-nickel alloy tube evaporator greatly prolongs the life of the equipment and the stable operation cycle of the production. It fundamentally eliminates the environmental pollution caused by the running of the equipment and the impact on the product quality, improves the production environment, and achieves energy saving. Emission reduction.
Rotary flash dryer
Nanfeng Chemical Group Co., Ltd. succeeded in adopting a rotary flash dryer instead of a fluidized bed dryer in the production of magnesium sulfate monohydrate.
Over the past few years, the company has been experimenting with laminar air drying, tower drying, and drum drying to produce monohydrate magnesium sulfate unsuccessfully. Later, fluidized bed drying was used to achieve stable production, but the energy consumption was high. Recently the company modified the drying equipment and used a rotary flash dryer instead of a fluidized bed dryer. The new drying equipment has the advantages of simple operation, large production capacity, and good energy-saving effect. In the production process, the company uses the hot air from the hot blast stove as a heat source to directly dry it, reducing heat loss. The cyclone dust collector is used to recover most of the materials, and then the bag dust collector is used to recover small dust. The dust removal effect achieves the environmental emission index. Compared with the original fluidized bed drying equipment, the coal consumption of the rotary flash dryer was reduced by 20% and the electricity consumption was reduced by 19%.
Production of Nano-Magnesium Hydroxide by Bubble Liquid Membrane
Guangdong Zhongshan Institute of Applied Chemistry recently developed a new method for producing nano magnesium hydroxide, the bubble liquid membrane method, which has the characteristics of low energy consumption and easy product separation.
The key equipment of this method is the bubble liquid film reactor, which uses a different stirrer than usual. It uses a bubbler-type disc stirrer to disperse the gas into uniform and fine bubbles, so that a sufficient amount of bubbles are generated in the reaction system. All the reaction liquids are divided into uniform and fine bubbles to form a sufficiently thin liquid film to constitute a nano reaction environment. Precipitation of the reactants, crystal nucleation, growth, and termination of the product, generation of nanoparticles, and the like are performed in the bubble liquid film. The process realizes rapid reaction at normal temperature and low energy consumption. The loose product has the characteristics of easy filtration, easy washing, and easy drying, and it solves the problem of difficult nanoparticle washing and high energy consumption for separation.
The technology has been designed to produce an annual output of 600 tons of magnesium hydroxide continuous reactor, can implement industrial-scale production, sophisticated equipment, low investment, easy to start, easy maintenance, low maintenance costs.
Using light powder as raw material process
At present, domestic production of light magnesium oxide and active magnesium oxide adopts dolomite carbonization method and ammonium bicarbonate brine method. Yuncheng Yaxing Environmental Protection Technology Co., Ltd. changes the traditional process and finds out a new energy-saving process using light fired powder as raw material.
The process uses light-fired powder as raw material for production. The unique technology is used to fully hydrate the light-burned powder, remove calcium and remove impurities, and produce magnesium hydroxide and then calcine to produce magnesium oxide. The biggest feature of this process is that the production coal consumption is greatly reduced, the unit coal consumption of the product can be reduced by about 3 tons, and the power consumption can be reduced by 250 kwh. The cost per ton of magnesium oxide can be reduced by around 3,000 yuan.
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