The Technology Study On Silicon Fertilizer With The Coal Mine Gangue

As the way of activating the coal mine Gangue, it is used by calcining the coal mine Gangue at high temperature and introducing the agents. We have optimized a set of laboratory technology through the single factor experiment and orthogonal test, then verify the result by the means of DTA, SEM, x-ray diffraction. Through the result of kinetic equations of become fertilizer, The results showed that the fertilizer can offer the effective silicon and useful elements extended steadily. And the content of hazardous Substances is under the national standards.We have made the experiments to verify the effect of the temperature, agents ratio, calcined time and calcined size. And we have done the deep research about the effect of the coal mine Gangue with TG and x-ray diffraction and the content of effective silicon. That results show that 700℃is the best temperature to activate the coal mine Gangue. The best ratio is:CaCO3:Na2CO3:NaOH= 1:0.5:0.1:0.05. The best calcined time and the best size are 2h and 80mu.At the base of the best applied technologue, we make the fertilizer, and among the fertilizer, the content of effective silicon can be up to 21.04%, the content of the water can be up to 0.97%,and the size is 89%.Through the 60mu of the standard sieve, it can be completely up to the requirement about the silicon fertilizer of the nation .By the kinetic experiments of the effective silicon,Cd,Pb,Cu,Zn in the become fertilizer, it indicates the fertilizer can steadily offer effective silicon,useful elements,the metal ions of Cu,Zn. The concentration of hazardous substances Cd,Pb can be reduced gradually. The highest concentration is 0.0087mg/mL and 0.1401mg/mL. It is under the content provisions of Cd and Pb about GB8173-87 0.01mg/mL and 0.5mg/mL, so it is not harm to the plant.