Abstract: When treating the DTRO concentrated water from Yulin Xiaojihan Coal Mine, tubular microfiltration membrane (TMF) is used instead of the clarifier for solid-liquid separation. Under the condition that the calcium ion concentration of the incoming water is 210 mg/L, the magnesium ion concentration is 221 mg/L, and the total silicon content is 160 mg/L, coagulation is carried out by adding sodium metaaluminate, calcium chloride, magnesium chloride and other agents. Afterwards, the tubular microfiltration membrane is used for solid-liquid separation. The SiO2 removal rate is ≥95%. The effluent meets the requirements of calcium ion concentration ≤10 mg/L, magnesium ion concentration ≤10 mg/L, and total silicon content ≤10 mg/L. And it meets the requirements of reverse osmosis inlet water turbidity ≤ 1 NTU and SDI ≤ 5, Compared to the original process, the operating cost is saved by 10% to 20%.