He swore to divorce her three times in a moment of anger
Question

                My wife is studying. We had a problem once and I swore by talaaq three times that if she goes to school she will be considered taaliq (divorced). I was serious and I really had the intention of talaaq, as I was very angry. Few days later I changed my mind, she also did not go to school until now. Please tell me, if she went to school would the talaaq be valid? Is there any expiation for this or not? Now I want her to go to school to complete her education.
Praise be to Allah.Firstly: 
For a man to use the word 
    of divorce (talaaq) lightly is a grave mistake, which may lead to the 
    disintegration of his family when he does not want that. Allaah has not 
    prescribed divorce to be something that is taken lightly or spoken 
    carelessly, or to play with women’s feelings, rather He has prescribed it 
    for the man to use it when he wants to end a marriage if there is a reason 
    to do so. 
What the man must do is 
    guard his tongue and restrain himself from using the word of divorce in 
    matters where divorce is not warranted, so that he will not regret it when 
    it is too late for regret. 
Secondly: 
Divorce at times of anger 
    may or may not count as such. This has been discussed in the answer to 
    question no. 45174. 
To sum up, in the event of 
    anger in which a person is out of his right mind, divorce does not count as 
    such, as is also the case with anger in which a man is not in control of 
    himself because an argument or fight has gone on too long.  
The man is the one who can 
    recognize the degree of anger that he reached, and can decide whether 
    divorce counts as such or not. 
Thirdly: 
Issuing a threefold divorce 
    in one go, such as saying “You are thrice divorced” or “I will divorce you 
    three times” counts as a single divorce according to the view favoured by a 
    number of scholars. 
If your anger did not reach 
    the degree that your divorce did not count, then you have issued one divorce 
    in this case – if your wife went to school – and you may take her back so 
    long as her ‘iddah has not yet ended. 
See the answer to question 
    no. 36580 for more 
    information. 
And Allaah knows best.