A method for laboratory preparation of cement clinker

Abstract

The invention discloses a method for preparing a cement clinker in a laboratory. The method comprises the following steps: A, preparing a raw material, namely independently grinding different raw materials, screening, mixing, putting water into coal powder, kneading into balls, putting the balls into a high-temperature furnace, and mixing weighed materials and coal ash so as to obtain raw material powder; B, preparing a test sample, namely putting water into the raw material powder, uniformly mixing, putting into a mold, pressing, demolding, and drying the test sample in a drying oven; C, calcining a clinker, namely putting the dried test sample into a high-temperature furnace, and calcining according to procedures of staged heating and heat preservation; and D, cooling the clinker, namely performing sudden cooling by using a cooling fan, crushing the cooled clinker, uniformly mixing, and performing powder milling on the clinker, a retarded adhesive material and a mixing material, thereby obtaining expected cement. The method has great instruction significances for cement development in laboratories. The clinker can be prepared from conventional raw materials and industrial wastes as well, and the cement clinker prepared by using the method can completely meet auxiliary material design requirements.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for preparing cement clinker in a laboratory. Background technique [0002] As a prerequisite for new product development, laboratory preparation of cement clinker is of great significance. It is an important basis for correct selection of raw materials, design of raw meal ratio, determination of raw meal preparation methods, and verification of ingredient calculations. There are many problems in the method of preparing clinker in the laboratory at present. [0003] The paper "Steel slag replaces iron powder batching to produce high-quality clinker" ("Cement Engineering" No. 6, 1999) written by Hou Xinkai and others discloses a method for preparing the raw material required for clinker in a laboratory: mixing various Mix 5Kg of industrial raw materials according to the ratio, grind them in a standard experimental small ball mill for 20 minutes to sieve about ...

AI Technical Summary

Problems solved by technology

Although the number of samples produced by this method has increased, when a large number of samples are required for strength tests, it is still necessary to repeatedly prepare samples, which takes a long time, and the amount of coal ash is not considered, and the raw material is not disclosed. Preparation

[0006] The method for laboratory preparation of clinker is disclosed in the chapter "High Temperature Firing of Cement Clinker" of "Inorganic Non-metallic Materials Experiment" (Chemical Industry Press) edited by Wu Hongbiao, but the same as the aforementioned prior art, the produced The sample size is small, which cannot meet the clinker demand for the strength test. At the same time, the sagger used for calcining the clinker has been proved by the experiment that the bottom of the saggar is not fully burned during the 1-4h calcination. Take out the sagger and clinker directly, the life of the sagger is greatly reduced

[0007] The above literatures have introduced the related methods of experimental preparation of clinker, but for the development of new varieties of cement, there are still many defects: (1) when it is necessary to do multiple sets of experiments, it takes a long time to mix all the raw materials and grind them , the labor intensity of personnel is high, it is not as convenient as mixing samples according to actual needs after grinding alone; (2) the amount of a single sample produced is small, which cannot meet the clinker dosage requirements in the clinker strength test, and this method needs to be repeated It takes a long time to make more samples; (3) Most of the samples produced are pellets, round cakes or cylinders, and there are problems of poor placement and high-temperature deformation and collapse during calcination; (4) When the sample is calcined in the sagger, affected by the factors of the sagger itself, there is a problem that the bottom sample cannot be calcined; (5) the preparation method does not consider the influence of coal ash from raw coal combustion during actual production, and no coal ash is added. (6) The existing technology does not provide a method for taking out the high-temperature clinker from the furnace, and there is a great potential safety hazard when using laboratory crucible tongs to take out the clinker at a temperature greater than 1200°C