Pilot test for the co-production process of soda ash and calcium chloride proves successful
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Pilot test of the co-production process for soda ash and calcium chloride proves successful. Authors: Xie Xiaoru, Cao Liyan. Source: China Chemical Industry News. Updated on September 28, 2012. The overall energy consumption has been reduced by 20%, while the salt utilization rate has increased by 20 percentage points. According to Sinochem New Network, reporters recently learned from Qingdao Soda Ash Co., Ltd. that after more than half a year of efforts, the company’s newly developed process for the co-production of soda ash and calcium chloride, which is protected by independent intellectual property rights, has successfully undergone pilot testing. Yu Yingming, deputy general manager of the company, said that the technical upgrade and transformation project for energy conservation and emission reduction in the soda ash system (referred to as the new process) has enabled the calcium chloride concentration to reach 40%. Moreover, the energy consumption for producing light soda ash has been reduced by 80 kg of standard coal per ton, based on the existing comprehensive energy consumption level of 405 kg of standard coal per ton. This makes it the world’s most advanced method for chemically synthesizing soda ash. The new process for co-producing soda ash and calcium chloride is a production method that lies between the ammonia-soda process and the combined soda process. It combines the advantages of both processes to produce soda ash and calcium chloride simultaneously. Due to the recycling of mother liquor, there is no wastewater discharge, making it an environmentally friendly production method. Meanwhile, the salt utilization rate has been increased from 75% to over 95%, resulting in significant savings in raw salt. Yu Yingming explained that, compared to the ammonia-soda process, the new process produces both soda ash and calcium chloride. The production costs are shared between the two products, thereby reducing overall production costs and significantly improving the economic efficiency of enterprises. In the ammonia-soda process, the concentration of calcium chloride in the raw material solution is approximately 11%; in the new process, this concentration can reach 40%. This not only reduces steam consumption by the equivalent of 200 kg of standard coal per ton of calcium chloride produced, but also, due to the lower equivalent amount of mother liquor, the distillation process for soda ash saves an additional 80 kg of standard coal worth of steam. Thus, the energy-saving effect is even more pronounced. Additionally, the solid waste from the new process mainly consists of under-burned limestone; there is no newly generated waste. It is easy to settle and wash, and the washing wastewater can be utilized in raw salt mining. After being used for desulfurization in thermal power plants and as construction materials, the solid waste can also be fully recycled. This significantly reduces both the energy consumption and production costs of the product.
I don’t quite understand this. Is it about producing calcium chloride from distillation waste liquid?
We’re also working on this. . .
This process is Japan’s Niitsu method for producing soda ash and calcium chloride. The ammonium chloride (wet ammonia) produced in the two-stage process of soda ash synthesis is then treated with quicklime powder to distill out ammonia, resulting in a high-concentration calcium chloride solution (40%). This calcium chloride solution is subsequently processed into dry calcium chloride. It’s mainly to reduce white mud. Since calcium chloride solutions are generally around 13% at present, using such a concentrated solution to produce dry calcium chloride results in high steam consumption. Therefore, energy conservation. However, since ammonium chloride has already been produced, using a distillation tower to remove ammonia causes significant corrosion to equipment and pipelines. This method is only advantageous when the market for ammonium chloride is unfavorable.
I’ve learned it. Thanks, moderator Piao’er!
It’s still the Japanese Shinix method, which involves recycling ammonium chloride during the production of soda ash
This process is Japan’s Niitsu method for producing soda ash and calcium chloride. The ammonium chloride (wet ammonia) produced in the two-stage process of soda ash synthesis is then treated with quicklime powder to distill out ammonia, resulting in a high-concentration calcium chloride solution (40%). This calcium chloride solution is subsequently processed into dry calcium chloride. It’s mainly to reduce white mud. Since calcium chloride solutions are generally around 13% at present, using such a concentrated solution to produce dry calcium chloride results in high steam consumption. Therefore, energy conservation. However, since ammonium chloride has already been produced, using a distillation tower to remove ammonia causes significant corrosion to equipment and pipelines. This method is only advantageous when the market for ammonium chloride is unfavorable
This process is Japan’s Niitsu method for producing soda ash and calcium chloride. The ammonium chloride (wet ammonia) produced in the two-stage process of soda ash synthesis is then treated with quicklime powder to distill out ammonia, resulting in a high-concentration calcium chloride solution (40%). This calcium chloride solution is subsequently processed into dry calcium chloride. It’s mainly to reduce white mud. Since calcium chloride solutions are generally around 13% at present, using such a concentrated solution to produce dry calcium chloride results in high steam consumption. Therefore, energy conservation. However, since ammonium chloride has already been produced, using a distillation tower to remove ammonia causes significant corrosion to equipment and pipelines. This method is only advantageous when the market for ammonium chloride is unfavorable
Most are experts :):):):):):)
Technological progress is the aspiration of generations of alkali industry workers; however, the path to achieving it is difficult. Congratulations!
Qingdao Soda Industry only conducted a pilot test; due to a relocation, it did not proceed further.