Price analysis of desulfurization agents
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This post was last edited by yc125 on 2010-4-26 at 19:37. The main chemicals used for desulfurization currently include CaO, Ca(OH)2, CaCO3, MgO, Mg(OH)2, liquid ammonia, ammonia water, NaOH, Na2CO3, etc.; please add any others that may be missing. The main desulfurization by-products include gypsum, magnesium sulfate, sulfuric acid, etc. Often, their price is the main factor in our choice of desulfurization process. Now, I will explain their current market prices; please share your thoughts and additions. CaO (quicklime): about 350 yuan/ton. Ca(OH)2: about 600 yuan/ton. CaCO3 (limestone): about 100 yuan/ton. MgO: about 1000 yuan/ton. Mg(OH)2: 500 yuan/ton. Liquid ammonia: 3000 yuan/ton. 20% ammonia water: about 300 yuan/ton. NaOH: about 4000 yuan/ton. Na2CO3: about 1500 yuan/ton. As for the prices of by-products, it seems quite chaotic as well; please feel free to leave comments to share the latest information. Please point out any mistakes.
NaOH: around 4,000 yuan per ton. Is that a bit expensive? Last time, even the better-quality caustic soda cost only 70 yuan per pack, for 25 kg. Almost 40 yuan per pack.
Is ammonia that expensive? I heard that some is offered for free, yet no one wants it
How can ammonia be unwanted, when liquid ammonia is so expensive? Ammonia is just in a different form; it remains a fertilizer and an industrial raw material after all. If you don’t want any, give it all to me; whatever amount there is, take it all.
Isopropylamine can also be used as a desulfurizing agent, mainly for desulfurizing refinery gas; it offers good desulfurization effects and can remove H2S and CS. QQ527727827 – it’s just a bit more expensive.
Zinc oxide can be used as a desulfurizing agent, with zinc sulfate as the by-product; this zinc sulfate can then be used as raw material for electrolytic zinc production. Since the desulfurizing agent itself is an intermediate product in electrolytic zinc factories, it is not necessary to purchase it externally, and there is no need to sell the product. The applicable scope is zinc electroplating plants.
Activated carbon is now gaining popularity in China as an adsorbent for a new type of dry desulfurization technology. Its price is over 5,000 yuan per ton; it can be reused, and its by-products can include high-concentration sulfur dioxide gas, sulfuric acid, or sulfur.
Price is not always the main factor either; for example, some factories have coking plants, and ammonia is a by-product of these processes, which can be used for desulfurization. In short, the choice of desulfurizer is mainly based on the convenience of its source.
Limestone remains the most commonly used desulfurization agent. The poster mentioned a price of 100 yuan per ton, which is on the high side; the usual price is between 60 and 80 yuan per ton. Given the large amount of limestone consumed for desulfurization in power plants, the total cost differs significantly as a result. As for ammonia-based desulfurization, it has been successfully implemented in China with few problems; such cases are indeed rare. Even when it is used, there are many constraints – it is best to have ammonia water as a by-product, as purchasing ammonia water for desulfurization is not practical nor economical. Recently, some power plants have also discussed using the ammonia-based desulfurization method, but they gave up on it due to cost reasons.
3# whf1129 No way, how could that be? Aren’t many factories using ammonia water for denitration these days?
It is understood that the amount of ammonia used for denitration is not very large; it is the ammonia used in ammonia-based desulfurization that constitutes a significant amount. Although there are already cases in China of large-scale power generation units (300MW capacity) successfully using the ammonia method for desulfurization, the disposal of the ammonium sulfate produced as a by-product remains an issue. For the traditional lime-limestone wet desulfurization method, which is widely used on an industrial scale, the handling of gypsum as a by-product poses a serious problem, and it has become another challenge in waste management. The accumulation of such waste occupies large amounts of land, and the penetration of heavy metals contained within it into groundwater systems can lead to greater safety hazards.