Method for preparing garden matrix from sand washing sludge of opencast quarrying mine

The invention relates to a method for preparing a garden matrix from sand washing sludge of opencast quarrying mine. The method is characterized by comprising the following steps of 1, preparing the sand washing sludge, acidic sticky red soil and organic fertilizer, and ensuring that the pH value after acid-base neutralization of the sand washing sludge and the acidic sticky red soil is 6.5-8.5; 5; 2, mixing the sand washing sludge, the acidic sticky red soil and the organic fertilizer to obtain a mixture; 3, loading the mixture into a planting bag, performing watering until saturation, and then performing placement for 12-24 hours; and 4, planting garden plants on the mixture by applying a conventional planting method, and when the garden plants can grow normally, obtaining the garden matrix. According to the method, the quality of the sand washing sludge can be improved, so that the sand washing sludge can meet the growth requirements of the garden plants,the sand washing sludge canbe reasonably utilized, a