What are the reasons for the high residual sulfur content in sulfuric acid slag produced by pyrite and tailings fluidized bed furnaces?
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Let’s discuss: What are the reasons for the high residual amount of slag from sulfuric acid production using boiling furnaces? How to solve it?
It’s probably due to lack of oxygen and incomplete combustion; more oxygen could help.
1. When the furnace temperature reaches 900 degrees, it is possible to control the formation of brown slag. 2. If the dust contains high levels of sulfur, it is necessary to adjust the air ratio; too short a residence time for the small particles can also lead to this issue
Adjust the roasting gas composition for oxygen-enriched roasting.
Our factory uses copper tailings for combustion, and the desulfurization efficiency is only a little over 2%. Low air volume leads to sedimentation and thus furnace failure, while high air volume results in short residence time of fine particles inside the furnace, leading to poor desulfurization. Do you know of any good solutions?
Reply to 5# wpdong: It is recommended to add secondary air to adjust the combustion air ratio, thereby preventing the formation of fine particles and delaying combustion.
The question posed now is quite simple, and I think the answer can also be simple: if you burn it at a higher temperature, the residual sulfur level will be lower. Remember, just cook it until it’s hot enough.
Reply to 1# I love Haichuan. The operation of the boiling furnaces in our factory relies mainly on the color of the slag; it is sufficient for the slag to be brown or dark brown. This is determined based on the residual sulfur content in the slag and the SO3 level in the furnace gases. If the residual sulfur in the fine slag is high, it is advisable to increase the amount of secondary or tertiary air, while also adjusting the total air volume supplied by the baking fan.
Our factory has recently been roasting purple gold sand; the reason for the poor fineness is that the temperature at the bottom of the fluidized bed furnace is below 800 degrees. If the gauge pressure is below 800 water columns, it’s barely possible to achieve the desired temperature. Do you know any effective methods to increase this temperature? ?
The residual sulfur in the acid production residues derived from pyrite is a significant issue, but it can be easily resolved by using the right methods! I’m not really sure what color the slag you’re producing is – red, brown, or black? Our company always uses black slag for processing. There are many ways to reduce residual sulfur: 1. Increase the furnace temperature; 2. Add more secondary or tertiary air; 3. Reduce the fineness of the ore; 4. Optimize the composition of the ore mixture; 5. Increase the residence time (by raising the slag discharge level); 6. Conduct regular tests on the properties of the slag and dust. There are many methods available, but it still depends on your specific situation! Data analysis is very important!
Mainly, the temperature at the bottom is low, around 750 degrees. Additionally, due to the air extraction capacity of the main fan, the fans at the bottom of the furnace cannot increase the amount of air supplied, which results in a lower overall load. As a consequence, dust continues to move backward, and the ash discharged from the boiler’s ash hopper is completely red. The residence time might be too short; I’d like to ask for your advice.