Method for detecting content of suspended matters in crude liquid in aluminum oxide production process

The invention relates to the technical field of aluminum oxide production, in particular to a method for detecting the content of suspended matters in crude liquid in the aluminum oxide production process. The method comprises the following steps: diluting to-be-detected crude liquid containing suspended matters, repeating until the absorbance of a solution of non-suspended matters in the to-be-detected crude liquid reaches preset absorbance and no crystal is separated out, and respectively obtaining absorbance data of a to-be-detected diluent and absorbance data of the to-be-detected diluent; filtering, and carrying out absorbance measurement to obtain absorbance data of filtrate; determining absorbance change data according to the absorbance data of the diluent to be detected and the absorbance data of the filtrate; drawing a standard curve of different suspended matter contents and standard absorbance change data; according to the absorbance change data and the standard curve, the suspended matter content