1. The ice-liquid curve in phase diagram of the antifreezer solution and its formula are deduced from measured value of freezing point.

2. The antifreezer for iron ore concentrates presented here is helpful to storage and to long-distance transport of iron ore concentrates in winter in the northern part of our country.

3. In order to screen antifreezer of peracetic acid used at low temperature, carrier quantitative germicidal test was used to examine the influence of different antifreezers on germicidal action.

4. It is likely to ensure normal gas transportation of the pipeline by several approaches, such as adding antifreezer, releasing pressure and sphere pigging.

5. A new concept called "liquid water-cement ratio" and its formula are advanced, which can be used to evaluate liquid water amount in the concrete mixed with antifreezer at negative temperature.