Utilization of sulfur concentrate slag

Slag can be sold to steel mills. At present, in the steel companies in our province, slag with an iron content of over 60% is required to be purchased; this is the basic requirement. As for other impurities, their levels vary depending on the iron smelting techniques used by each steel company. I don’t know where your slag is located, so it’s difficult to calculate the shipping cost. If the distance is too great, and considering the current price of the slag, the shipping cost could end up being higher than the price of the slag itself; in that case, it’s likely that the steel company won’t accept it. It’s best to ask the steel company for the exact price first, and then add the shipping cost to get a clear total amount, which will make things easier.

Thank you for your reply. I was wondering what the approximate price would be for something with 60% iron content in your area. Thank you

There is a significant difference in our prices, which has been agreed upon with the mineral suppliers; we receive a subsidy of 100 yuan per ton of mineral. We guarantee that the iron content in the slag will be over 60%! !

The slag has to be brought back to the country, with shipping costs of over 40 dollars per ton; added to the price of the slag itself, it’s unlikely that any steel mills will be interested in it. In 2007, the price of iron ore was 88.25 dollars per ton.

I asked MaSteel today, and they said the iron content is over 66%, sulfur content is below 0.5%, and the price is 1500 yuan per ton; of course, this might be the price of iron ore imported from abroad

Ask Nansteel’s iron plant – they used to rely on the iron slag from Nanhua Fertilizer Plant.

Friend, where are you from? Where do you plan to build the plant for producing acid from sulfur concentrate? Do you own the sulfur concentrate? I’ll leave you an email so we can communicate; fclmail001@163.com

Recently, Hubei Huangmailing Phosphorus Chemical Co., Ltd. plans to invest 170 million yuan in building another production facility capable of producing 300,000 tons of pellets per year. This facility will be used to roast the pyrite slag generated during sulfuric acid production, thereby extracting iron pellets with an iron content of 62%, in order to address the environmental issues associated with the accumulation of waste residues. For many years, Huangmailing Company’s production facilities have used the process of burning low-grade pyrite to produce sulfuric acid. The pyrite slag generated is disposed of by stacking. As production continues to increase, storing pyrite slag requires not only a large amount of land and capital, but also, when strong winds blow, red dust from the ore spreads everywhere, contaminating the surrounding environment. The company also invests a significant amount of manpower and capital each year to strengthen governance. In 2004, Huangmailing Company invested 40 million yuan in a production facility capable of producing 100,000 tons of pellet ore per year. This device utilizes advanced domestic shaft furnace roasting technology to roast the pyrite slag generated in sulfuric acid production, thereby producing iron pellets with an iron content of 62%. Iron pellets have always been in high demand in the market, and all the iron pellets they produce are sold to large domestic steel companies. In 2005, solely from this initiative, the company generated direct economic value of 60 million yuan. To enhance the comprehensive utilization of pyrite slag, Huangmailing Company plans to invest 170 million yuan this year to install another production facility capable of producing 300,000 tons of pellets per year, as well as to carry out technical upgrades aimed at converting low-sulfur ores into high-sulfur ores. Currently, the project is undergoing technical evaluation, and it is expected to be completed and put into operation within this year. After the technical improvement is successful, the iron content in pyrite slag can reach over 62%, and it can be used directly in the ironmaking industry after being pelletized.

Thank you very much. Could you provide the name of the design firm responsible for this project? If it’s not convenient, you can send it to my email address; an address from this website will work as well, or you can send it to wangjingfeng@mccgrd.com

Please explain to us the situation of the projects abroad in detail – whether sulfur or pyrite is used as raw material, and what the scale is – so that we can give you some advice.

Oh, thank you. The situation is as follows: We are planning to set up a nickel smelting project in Oceania, using a wet smelting process. It is planned to install a sulfuric acid production facility with an annual capacity of 800,000–900,000 tons. Initially, the plan was to produce sulfuric acid from sulfur, but now the local authorities hope that we can deal with the sulfur concentrate by-product from a local copper processing plant (actually, this sulfur concentrate was produced through flotation processes that were established this year). Since the local basic industry is quite underdeveloped, there are no cement factories or iron smelters, so it is necessary to consider how to handle the slag resulting from this process. The relevant experimental data are as follows: 1. Chemical composition and particle size range: Elements – Fe, S, Si, Al, K, Na, Cu, Ca, Mg, Ti, Mn, Zn, Co, Mo, Pb, Ni, V, Cr, Cd; Contents (%): 38.8, 44.6, 4.6, 1.4, 0.9, 0.4, 0.31, 0.3, 0.24, 0.046, 0.035, 0.028, 0.022, 0.015, 0.01

Foreign aid projects must be successful; otherwise, it will harm China’s image. 1 If sulfur resources are available locally, it is advisable to use the sulfur-based acid production method. Several 800,000 tons per year sulfur-based acid production plants have already been put into operation in China, and most of the equipment can be domestically sourced; HRS can be considered later. 2 If the sulfuric acid production process using pyrite is adopted, it is more challenging. An 800,000-ton/year pyrite-based sulfuric acid production plant can use a process that involves two stages at the beginning (roasting and purification) and one stage at the end (conversion, drying, and absorption). Whether the electrostatic precipitators in the pyrite roasting furnaces can operate properly, as well as whether closed acid washing can be carried out effectively, are all issues. The 200,000-ton/year pyrite-based sulfuric acid production plant in Nanhua’s System 7 used pyrite from Jiangxi Yongping Copper Mine; initially, the electrostatic precipitators in the roasting furnaces did not function properly, and closed acid washing was not possible. Later, the process was changed to one based on 250,000 tons of sulfur per year for sulfuric acid production. 3 If it is decided to adopt the sulfuric acid production method using pyrite, it is possible to visit large and medium-sized manufacturers that use pyrite for this purpose (such as Hubei Huangmailing Phosphorus Chemical Co., Ltd.). Last edited by That makes sense on 2008-1-30 11:47]

The 200,000-ton/year pyrite-based acid production plant of the Nanhua 7 system used sulfur concentrate from the Jiangxi Yongping copper mine; when the furnace was first put into operation, the electrostatic dust removal system did not function properly. Even when the capacity was increased to 250,000 tons/year for sulfur-based acid production, closed acid washing was not implemented. Is there also closed acid washing in sulfur-based acid production?

Hello, brother: I have two questions: 1. What are the approximate investment costs for sulfuric acid production facilities using pyrite on a scale of 400,000 tons per year in China, and for those using sulfur? 2. What is the impact of the harmful components in pyrite slag on the environment?

At current prices, the investment for a 400,000-ton sulfur-based acid production plant in China is approximately 80 million yuan, while the investment for a 400,000-ton pyrite-based acid production plant is around 120 million yuan.

At current prices, the investment for a 400,000-ton sulfur-based acid production plant in China is approximately 100 million yuan (excluding power generation), while the investment for a 400,000-ton pyrite-based acid production plant is about 180 million yuan.

Magnetic separation can be employed; the slag with an iron content of over 60% can be sold at 600 yuan per ton. Our company possesses this technology, and those interested should get in touch with me.

Well, it’s usually done through magnetic separation to separate iron slag from red powder slag; the iron slag can be sold at a higher price, while the remaining red powder slag is worth around a few dozen yuan per ton