Please Help Me To Correct The Paper!

The above diagrams which will show how the concrete and cement be is made, and what kind of equipments have to be used  for.

In Regrading to  cement production, the main materials are limestone and clay, which have to be crashed into the podwer, then go through the mixer. After that, the mixed powder will go to a rotating header and be heated with fire. Finally, we use using the grinder to make the mixture become the powder again. Mentioning to Regarding the concrete production, we need to put 15% cement, 10% water, 25% sand and 50% gravel into the concrete mixer, and adopt a rotation method to mix each materials perfectly.

Generally speaking, cement is one of materials to produce manufacture the concrete, and its manufacturing process is more complicate but the materials is more simple than concrete production. However, the concrete production just contains single manufacturing process but requires appropriate percentage materials to make the finishing goods.

[Nice job. You made only a few mistakes. In/ regarding is fine for both your sentences (first and forth ones). I just made alternatives to make it sound not repeated. And 'manufacture' is a Noun, so I change by 'produce' - a verb, becasue in this sentence you need a verb after 'TO'. In your last sentence, I think you made a typo mistake: concrete should be 'cement'. This is more relevant to the above sentence.] 

Please help me correct the (this) paper

The above diagrams which show how the concrete and cement be (are) made, and what kind (type) of equipments have to be used for. (are used in the process.)

Regrading to the cement production, the main materials are limestone and clay, which have to be crashed (crushed) into the power, (powder) then go trough (which is then sent through) the mixer. After that, the mixed powder will go to a rotating header and to be heated with fire. Finally, using the grinder, to make the mixture become (is ground into) the powder again. Mentioning to the concrete production, (At this stage of production) we need to put (a mixture of) 15% cement, 10% water, 25% sand and 50% gravel (is sent) into the concrete mixer, and adopt a rotation (where a rotating) method (is used) to mix each (all the) materials perfectly (evenly).

Generally speaking, cement is one of (the) materials (used in) to manufacture (manufacturing) the concrete,(.) and its manufacturing process is more complicate(d) but the materials is more (are simpler) simple than (the materials used in) concrete production. However, the concrete production just contains (utilizes) (a) single manufacturing process but requires appropriate (a precise) percentage (of) materials to make the finishing goods. (finished product)