Limestone mine tailings dolomite used in cement production batching method

Abstract

The invention provides a method for mixing limestone mine tailings dolomite in cement production, which includes the following steps: drilling and sampling before mining, detecting the content of MgO in the mineral material, and selecting the sampling point where the MgO content difference exceeds 0.5%. Divide into different areas and mine in different areas; crush the ores in each area with a hammer crusher; use round piles in the homogenization silo to store them, and determine the size and height of the round piles according to the daily processing capacity of cement production. Results Calculation of the proportion of mineral materials mined in different areas in the round heap, so that the MgO content in the round heap after stockpiling is not more than 2.7%. The invention ensures the compositional uniformity of each batch of raw materials in the cement production process, avoids the influence of loading speed on the batching uniformity, increases the qualified rate of cement raw materials from 65% to more than 88%, and improves the qualified rate of cement; The invention also improves the utilization rate of dolomite, reduces mining cost and protects the environment.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of dolomite; in particular, it relates to a method for using limestone mine tailings dolomite as ingredients in cement production. Background technique [0002] Limestone ore is a kind of sedimentary rock, its mineral composition is mainly CaCO3, it is often used as building materials, and it is also an important raw material for many industries. In the mining of limestone, a large amount of dolomite is often associated with it, resulting in more impurities in the mineral. Dolomite is an ore similar to limestone, but its composition is quite different. Dolomite contains a large amount of unstable component MgO, and the content of MgO in dolomite in most mining areas is between 3% and 27%. The collected limestone is used to produce cement. When the content of MgO in the raw material exceeds 3%, it is easy to cause the quality of the cement to be unqualified. At the same time, be...

AI Technical Summary

Problems solved by technology

However, in the actual operation, the batching by car is used, and the ore is transported into the homogenization silo for storage according to the calculated ratio. During the transfer process, due to the different speeds of the loading and unloading trucks, the detection ratio of MgO in some storage areas reaches 6-8%. As a result, the qualified rate of cement is greatly reduced. When sampling and testing the raw material warehouse, the qualified rate is only about 65%.

And dolomite is mixed according to the original method, the utilization rate of dolomite is still low, and the discarded material rate cannot be reduced to below 10%. The disposal of a large number of collected dolomite not only causes waste of mining manpower and material resources, but also causes waste of resources and environmental pollution.