Crushing, Screening & Conveying

Crushing, Screening & Conveying 2017-04-04T06:57:13+00:00
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Single stage crushing, closed circuit impactor for fines production (1 reply)

7 months ago
JackStephen 7 months ago

Hi everyone,

The company I'm going to work for (beginning in january)  is looking to expand their operations and are planning to acquire a barely used track mounted HSI crusher (KPI FT4250 rated 500TPH according to manufacturer) to produce minus 1/4"  ceramic clay fines. They are expecting to reach a production of at least 125 TPH in closed circuit.  The feed has a maximum size of 12", with F80=8". I don´t have any information regarding work index, but must be around 7 (think gypsum).

To this date, they have successfully operated smaller equipments to produce 3/4" to fines, but with yields of about 70 TPH. I'm afraid that, even when the FT4250 is a much bigger crusher, the capacity will be diminished because of the smaller size particle of the final product, recirculation and screen overloading. Humidity isn't a problem as the plant will be located in a desertic zone. The equipment must be mobile as it will be operating inside the quarry.

I'm an aggregates guy, familiar with multi-stage crushing and this is the first time I hear something like this. Do you think it's doable? They are asking for some advice and I'm trying to find out because I'll be in charge of this new operation along with 2 more. 

Thanks in advance,


7 months ago
AJNeale 7 months ago
1 like by David

My guess is that you are going to have enough horsepower on the HSI, and it will all come down to screening efficiency which may mean increasing the size of the screen, and perhaps going to a double deck if you don't already have one.  

The trick with the HSI is to make sure the feed is spread evenly across the feed chute, otherwise you wear out the centre of the blow bar, and you can't control the gap, and then your circulating load creeps up over time.  Other than that, the high speed of the HSI is great for making fines on each pass.  If you get the screening right you'll look like a hero.  Good Luck - Andrew

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