Method for producing cement clinker by using dry-process predecomposition kiln

Abstract

The invention relates to a method for producing cement clinker and in particular relates to the method for producing the cement clinker by using a dry-process predecomposition kiln. The method is characterized in that the cement clinker is prepared from raw materials in percentage by weight: 1-60% of dicyandiamide waste residues, 20-85% of limestone, 5% of carbide slag, 8% of white ash residues, 8-9% of waste silica, 4% of iron powder and 4-5% of electroslag; and the method comprises the following steps of: breaking and conveying the limestone, storing the dicyandiamide waste residues, storing and conveying auxiliary raw materials, blending the raw materials, mixing, grinding and drying the raw materials, carrying out powder grinding, homogenizing the raw materials, setting a kiln tail feeding system, preparing pulverized coal, carrying out clinker sintering, and storing and conveying the clinker. The invention provides a unique raw material for producing the cement clinker by using the dicyandiamide waste residues instead of part of calcareous materials, so that the pollution of the dicyandiamide waste residues on an environment can be eliminated and the consumption of primary energy can be reduced.

Description

technical field [0001] The invention relates to a method for producing cement clinker, in particular to a method for producing cement clinker with a dry precalcining kiln. Background technique [0002] In Taisha Industrial Park, Pingluo County, Ningxia, there is a large amount of industrial waste for secondary use. As an important domestic cyanamide product base, there are BMW, Lingyun, Belite, Xingping Chemical, Dadi Chemical and other manufacturers in the industrial park to produce dicyandiamide and cyanamide, which will produce a large amount of dicyandiamide and cyanamide during the production process. Amine waste slag; about 6-7 tons of waste slag are produced for every ton of dicyandiamide and cyanamide produced. These waste residues are disposed of in landfill, which has a great impact on the local environment and groundwater resources. [0003] The main component of dicyandiamide slag is calcium oxide, which mainly exists in the form of calcium carbonate, and its c...

AI Technical Summary

Problems solved by technology

Therefore, dicyandiamide slag can be used as raw material to produce cement clinker, but there are still the following problems in the production of cement clinker with dicyandiamide slag as raw material: 1) How to put the dicyandiamide slag into the mill and dry when the water content is about 35%? 2) Dicyandiamide slag has been reacted many times, and the production of cement has the characteristics of fast reaction speed and high activity. How to reasonably determine the batching scheme? 3) How to solve the control difficulties of the pre-decomposition system outside the kiln after the dicyandiamide slag is used for batching?

[0004] So far there is no way to overcome the above problems