Reasons for poor slag discharge from the large grate in the sulfuric acid system.
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Currently, the raw sulfur ore used by our company has changed; the new ore is high-sulfur and contains over 60% iron. After the new furnace was put into use, when the furnace temperature was maintained above 700°C, it was found that the slag produced became sticky, making slag removal difficult. The situation returned to normal when the furnace temperature dropped to 640°C, but the slag still remained sticky. The mine was analyzed, with a total salt content of 42.95 g/L. Sample Number Analyzed Elements Pb(%) Zn(%) Ash 0.57 0.46 Slag 0.57 0.45
It is related to the impurity content in the ore. If slag discharge is normal at around 640 degrees, but the lead and zinc levels in the ore are above the limit, along with high sulfur and high iron content, an increase in furnace bottom pressure is a normal phenomenon that can be resolved through adjustments. In such cases, pay attention to the ash discharge from the boiler as well as that from the high-pressure exhaust.
If the ore is purchased externally, attention should be paid to ore blending. At this temperature, what is the residual sulfur level? If purchasing gold mining ore, pay attention to the fineness. We all keep it above 900 degrees; perhaps the mineral sources are different, so feel free to exchange more ideas.
For gold smelting ore, attention should be paid to the fineness. Could you tell me more about the issue of fineness? What we’re burning now should be gold smelting ore; there’s no pressure at the bottom of the furnace, so the temperature in the lower layers doesn’t rise, while the temperature in the upper layers increases. We’ve already cleaned the furnace several times
We have also encountered high-lead zinc ores; we usually keep the furnace temperature around 800 degrees, with residual sulfur at less than 1%
I’m sorry; I’ve had a lot on my plate lately and couldn’t reply in time. I’m responding to some of the posts from forum members tonight. During the roasting of gold-mining ore, especially that from the Jiaodong Peninsula, a low fixed layer results in low bottom pressure, which leads to accumulation at the feed port and the formation of high-temperature scars ； Over-temperature in the furnace leads to the formation of high-temperature scars ； The furnace outlet has experienced sticking due to excessive temperature ； The overflow port discharges very little slag, resulting in plenty of ash and little slag ； The overall temperature of the purification system is too high or exceeds the limit. I’m not sure which mining provider my friend is using, or what specific issues there are; I hope we can exchange more information on this. We have used gold smelting ore throughout, encountered all the problems associated with boiling furnaces, and it has now been operating normally for nearly two years. Working with sulfuric acid is very tough, especially when the roasting process doesn’t go as planned; it’s frustrating and annoying.
We used to clean the furnace every day, leaving no room for any kind of management.
Is your raw ore gold ore from the mountains?
We are a gold smelting enterprise that utilizes gold cyanidation residues to enhance sulfur enrichment, raising the sulfur content from around 25% to around 48%, resulting in so-called high-sulfur ores. These ores are then fed into furnaces for roasting to produce sulfuric acid and iron concentrate; we produce 300,000 tons of sulfuric acid and 120,000 tons of iron concentrate per year! I just went to a company in the south a few days ago to provide guidance on its operations; we can exchange ideas with each other.