磷酸在活性炭生产中有什么作用？

%E7%AC%AC%E4%B8%80%EF%BC%8C%E6%9C%80%EF%BC%8C%E4%BC%98%E7%A7%80%EF%BC%8C%E5%A2%9E%E5%BC%BA%EF%BC%8C%E4%B8%80%E6%B5%81%EF%BC%8C%E5%8D%93%E8%B6%8A%EF%BC%8C%E9%A2%86%E5%85%88%EF%BC%8C%E5%85%88%E8%BF%9B%EF%BC%8C%E5%BC%95%E9%A2%86%EF%BC%8C%E5%9B%BD%E9%99%85%EF%BC%8C%E7%AC%AC%E4%B8%80%EF%BC%8C100%25%EF%BC%8C%E5%AE%8C%E7%BE%8E