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A method for determining the amount of crystalline silica in cement raw materials

A technology of crystalline silica and cement raw materials, which is applied in the field of materials, can solve the problems of unfavorable detection of crystalline silica, reduce clinker output, and slow reaction speed, etc., and achieve fast and convenient measurement, wide application range, and simple operation Effect

Active Publication Date: 2018-10-30
QINGSHEN XINTONGLING BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been pointed out in the literature that crystalline SiO 2 Size exceeding 44 μm can lead to CaO and SiO in the calcination process 2 The reaction speed becomes slower, the burnability of raw meal becomes worse, the output of clinker is reduced, and the heat consumption of firing is increased.
Crystallization of SiO in Raw Materials 2 However, most cement plants do not have the above-mentioned testing equipment, which is not conducive to the detection of crystalline silica in industrial production and the analysis of the impact of large-size crystalline silica on clinker. quality impact

Method used

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  • A method for determining the amount of crystalline silica in cement raw materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: a kind of assay method of crystalline silica quantity in cement raw material, it comprises the following steps:

[0020] S1. Pretreatment: Take the cement raw material to be tested and put it into a drying oven for drying. The temperature of the oven is set at 120°C and the time is 50 minutes. After cooling, it is crushed until the particle size of the raw material is 5-7 mm and mixed evenly;

[0021] S2. Grinding: Grinding of a single sample: take 5 kg of pretreated cement raw material for grinding, take 90 g of powder to check the sieve residue of 80 μm, stop grinding if the sieve residue is 10-15%;

[0022] S3. Prepare analysis sample: pass the ground material through a 0.9mm sieve, take 50g of a 0.9mm sample, put it into the grinding disc of the vibratory mill, and grind for 2min, which is the analysis sample;

[0023] S4. Sample analysis: measure and analyze the quantity of silicon dioxide, aluminum oxide, ferric oxide and calcium oxide in the sample,...

Embodiment 2

[0024] Embodiment 2: a kind of assay method of crystalline silicon dioxide quantity in cement raw material, it comprises the following steps:

[0025] S1. Pretreatment: Take the cement raw material to be tested and put it into a drying oven for drying. The temperature of the oven is set at 160°C and the time is 70 minutes. After cooling, it is crushed until the particle size of the raw material is 5-7mm and mixed evenly;

[0026] S2. Grinding: grinding of a plurality of similar samples, wherein the plurality of similar samples are limestone cement raw materials and siliceous cement raw materials; 5 kg of limestone cement raw material samples are taken for grinding, and 110 g of powder is taken to check the sieve residue of 80 μm, If the sieve residue is 10-15%, stop grinding, record the time as t, and grind the siliceous cement raw material sample as t, and check the sieve residue of 80 μm;

[0027] S3. Prepare analysis sample: pass the ground material through a 0.9mm sieve, t...

Embodiment 3

[0029] Embodiment 3: a kind of assay method of crystalline silicon dioxide quantity in cement raw material, it comprises the following steps:

[0030] S1. Pretreatment: Take the cement raw material to be tested and put it into a drying oven for drying. The temperature of the oven is set at 135°C and the time is 55 minutes. After cooling, it is crushed to a particle size of 5-7mm and mixed evenly;

[0031] S2. Grinding: Grinding of multiple samples of the same kind, which are limestone cement raw materials, siliceous cement raw materials, and aluminum cement raw materials; take 5 kg of limestone cement raw materials for grinding, and take 100 g of powder to test the 80 μm sieve If the sieve residue is 10-15%, stop grinding, record the time as t, and grind the remaining samples as t, and check the sieve residue of 80 μm;

[0032] S3. Prepare analysis sample: pass the ground material through a 0.9mm sieve, take 50g of a 0.9mm sample, put it into the grinding disc of the vibratory...

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Abstract

The invention discloses a method for measuring the quantity of crystalline silica in cement raw materials. The method comprises the following steps of S1, pretreatment, S2, powder grinding, S3, analysis sample preparation; S4, sampling analysis: measuring the quantity of silicon dioxide, aluminum oxide, ferric oxide and calcium oxide in analysis samples, and performing evaluation according to a ratio value difference value or a difference value of the quantity of crystalline silica in the cement raw materials to be measured and 80mum screen residue samples. The method for measuring the quantity of crystalline silica in cement raw materials provided by the invention has the advantages that the study on the crystalline silica in the raw materials through large-scale detecting instruments such as X-ray diffraction instruments, scanning electron microscopes and optical microscopes which are not arranged in a cement plant is not needed, so that the operation of the method is simple; the measurement is fast and convenient; the cost is low; the application range is wide; the operation can be performed by using the existing general detecting instrument of the cement plant.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for measuring the amount of crystalline silica in cement raw materials. Background technique [0002] my country is a big cement producing country. With the rapid development of the national economy and the continuous improvement of people's living standards, the demand for cement is increasing day by day. The key to cement production is the firing of clinker. The raw materials for producing cement clinker are usually limestone, siliceous raw materials (clay or shale), aluminum raw materials and iron raw materials. According to the process formula, it is mixed in a certain proportion, ground and calcined in the kiln at 1400-1450 ° C. The preparation ratio of various raw materials, that is, the raw material formula, is determined according to its chemical composition. In terms of chemical composition, the weight percentage of the prepared raw meal is gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 张大康曾君吴建越焦永焕封培然龙卫红
Owner QINGSHEN XINTONGLING BUILDING MATERIALS CO LTD