https://file.aiquickdraw.com/mathbot/file/1721120048582c13gzijq.png

Let's break down and solve the given problem step by step.

### Problem Breakdown:

1. **Flow sheet of the process**:
    - A jaw crusher with a screen having a 125 mm opening in a closed circuit.
    - New material fed into the screen: 300 t/h.
    - Screening efficiency: 90%.
    - 60% of this feed is larger than 125 mm.
    - Ratio of oversize in the crushed ore: 15%.

2. **Calculate the amount of circulating load on the jaw crusher**.

3. **Calculate the amount of circulating load on the screen**.

4. **Calculate the amount of the load on the jaw crusher if the crusher works with the same screen in open circuit**.

### Step-by-Step Solution:

1. **Draw the flow sheet of the process**:

    - **Initial Feed**: 300 t/h (to the screen).
    - **Screen Efficiency**: 90%.
    - **Oversize Feed (larger than 125 mm)**: 60% of 300 t/h = 180 t/h.
    - **Undersize Feed (smaller than 125 mm)**: 40% of 300 t/h = 120 t/h.
    - **Effective Screening**: 
      - Oversize: 180 t/h * 90% = 162 t/h.
      - Undersize: 120 t/h * 90% = 108 t/h.
    - **Oversize Recycled**: 180 t/h - 162 t/h = 18 t/h (to jaw crusher).
    - **Oversize in Crushed Ore**: 15% of crushed ore.

    ![Flow Sheet Diagram](https://www.link_to_image.com) (Placeholder for actual drawing)

2. **Calculate the amount of circulating load on the jaw crusher**:

    - **Circulating Load Calculation**: 
      - Oversize material returned to the jaw crusher: 18 t/h.
      - Effective Load on Jaw Crusher: Initial feed + Recycled load.
      - Assume initial load on jaw crusher is the oversize feed returned: 180 t/h.
      - Total Load on Jaw Crusher: 180 t/h (initial) + 18 t/h (recycled) = 198 t/h.
      
3. **Calculate the amount of circulating load on the screen**:

    - **Circulating Load on Screen**:
      - Effective Screening of oversize: 90% of 180 t/h = 162 t/h.
      - Oversize material returned: 180 t/h - 162 t/h = 18 t/h.
      - Load on Screen: Initial feed + Recycled load: 300 t/h + 18 t/h = 318 t/h.

4. **Calculate the amount of the load on the jaw crusher if the crusher works with the same screen in open circuit**:

    - **Open Circuit Load**:
      - In an open circuit, there is no recycling of oversize material.
      - The crusher only handles the initial feed.
      - Load on Jaw Crusher: Initial oversize feed = 180 t/h.

### Detailed Calculations and Summary:

1. **Flow sheet**: [Drawing needed]
2. **Circulating Load on Jaw Crusher**:
    - \( \text{Total Load} = \text{Initial Oversize} + \text{Recycled} = 180 \, \text{t/h} + 18 \, \text{t/h} = 198 \, \text{t/h} \)
3. **Circulating Load on Screen**:
    - \( \text{Total Load} = \text{Initial Feed} + \text{Recycled} = 300 \, \text{t/h} + 18 \, \text{t/h} = 318 \, \text{t/h} \)
4. **Open Circuit Load on Jaw Crusher**:
    - \( \text{Load} = \text{Initial Oversize Feed} = 180 \, \text{t/h} \)

Would you like more detailed explanations on any of these steps? Here are some additional questions you might find useful:

1. How do you calculate the efficiency of the screening process?
2. What factors influence the circulating load in a closed circuit?
3. How does the open circuit operation differ from the closed circuit in terms of equipment load?
4. Why is it important to understand the ratio of oversize in crushed ore?
5. Can you explain the significance of the 15% ratio of oversize in the crushed ore?

**Tip**: Always verify your calculations by cross-checking different stages of the process to ensure the accuracy of your results.

Learn how to calculate circulating load in a closed circuit jaw crusher and screen process. This problem involves material balances, screening efficiency, and the circulating load formula. Ideal for professionals in the mining and mineral processing industry.

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