How to take divorce

My name is selvakumar I married to already divorced lady 10yrs back and have 2 children and she is from backwards caste.. What all happening in my life is there is no peace in my family till now I waited she may understand in coming days, she doesn't have any respect towards elders always and very mentally tourchoring me.because of our well wish my mom she left home went to my sister house recently I suffered from chest pain and hypertension and I admitted in hospital my wife even there she was not ready to spend my money to hospital and she is very greedy of money I informed my mom she came and she was taking care of me after few days my wife bet my mom. Without any reason and put her out but still I was waiting for time that I will bring my mom back now she is living in temple I sold my current home and purchased plot in other place where my wife is not ready to come I told if u don't come with me u can leave me now she is demanding for the compensation and threatening me she will kill my children no more I want to live with her I want divorce and even my children.