I moderate questions and answers on a daily basis, but to be honest most of the questions that end up being removed are quite obviously spam (i.e. They don't answer the question, use duplicate content from other sites, and contain unnecessary links).
If you don't feel your answer falls into this category, then, firstly, I want to apologize.
We value our answerers very highly, and I know how frustrating it can be to spend time carefully writing an answer only for it to disappear - it happened to me a couple of times too!
The reason I think this may have happened is that - as well as my moderation, we also use an automated system that picks up on bad words etc... And, as with any automated system, sometimes it get's it wrong.
If you think this has happened to you, it's important to report it. Not only because we can put your answer back up again, but it also helps us identify the mistakes with our system, which we aim to continuously improve.
You can message me on here, or email me at [email protected] if you are worried that your answers are being deleted incorrectly. Please provide a link to the question page so I can track it up quickly and see what's going on.