Magnetic Mineral Consistency Analysis the main ingredients of cement and Rowmix materials with Magnetic Susceptibility Method using Bartington Magnetic Susceptibility Type B (MS2B)

Cement has hydraulic properties (mixed with water) will form a bond and harden. Cement-making materials consist of the main ingredients (Limestone, Iron Sand, Silica, and Clay) which are the ingredients in the manufacture of Rowmix in the Rowmill. In the main ingredient there is a magnetic mineral content for the manufacture of Component Compoun. To see changes in magnetic minerals from the cement manufacturing process, it is necessary to analyze the consistency of the material until the initial manufacture. The purpose of this study was to determine the consistency of the magnetic mineral as the main ingredient of cement in the Rowmix manufacturing process. The research method used is rock magnetism using a Bartington Susceptibility Meter Type B (MS2B) which can measure based on mass and volume with 2 different frequencies, namely Low Frequency and High Frequency. This measurement uses 6 different samples, namely the main ingredients of cement (Limestone, Irond Sand, Silica, Clay) and Rowmix materials (Rowmix 1 (RX1) and Rowmix 2 (RX2). From these measurements, the susceptibility values obtained from the main ingredients including Limestone approx. 23.7 x 10−8 m3/kg - 46.6 x 10−8 m3/kg, Irond Sand ranged from 470 x 10−8 m3/kg - 1791.1 x 10−8 m3/kg, Clay ranged from 852.7 x 10−8 m3/kg - 986.4 x 10−8 m3/kg, Silica ranges from 148.2 x 10−8 m3/kg - 166.9 x 10−8 m3/kg, while in Rowmill I process (Rx1) around 133, 4 x 10−8 m3/kg - 180.3 x 10−8 m3/kg, Rowmill 2 (Rx2) 133.4 x 10−8 m3/kg - 244.2 x 10−8 m3/kg, Magnetic susceptibility values in the main material range from 1532 x 10−8 m3/kg up to 2838,6 x 10−8 m3/kg, while the value of Rowmix 1 (RX1) and Rowmill 2 (Rx2) is lower than the magnetic susceptibility value of the main ingredient.


Introduction
Cement is produced with standard Chemical and Physical parameters.These standards are achieved by implementing quality control and quality assurance.This testing and control includes x-ray testing, sieving, compressive strength, H2O, and others [1].However, none of them has a magnetic mineral standard, even though one of the main ingredients for making cement comes from Iron Sand which contains magnetic minerals.
Minerals are inorganic solid materials that occur naturally, which consist of chemical elements in a certain amount, where the atoms in it are arranged following a systematic pattern [2].Minerals have 5 properties of magnetic materials, namely Diamagnetic, Paramagnetic, Ferromagnetic, Antiferromagnetic, and Ferrimagnetic [3].The purpose of this study was to determine the consistency of magnetic minerals as indicated by their magnetic susceptibility values.This research uses rock magnetism method to accompany chemical and physical methods which are used as quality control and quality assurance (Figure 1). Figure 1.Cement manufacturing control Magnetic susceptibility measurements can be performed on almost any material.Magnetic susceptibility measured over a certain range of magnetic fields will give a magnetization relationship with that field.This relationship can give a linear or non-linear relationship depending on the magnitude of the magnetic field used.Magnetic susceptibility was measured using a susceptibility meter.Rock type affects its susceptibility value [4].

Place and Time of Implementation
This study took samples from PT. Semen Padang and conducted research at the Physics Laboratory of Padang State University.Sampling time was carried out in February 2022 and conducting research in April 2022.

Sample Measurement
Sample measurement was carried out in several stages, namely the first stage of sampling at PT. Semen Padang.The second stage of the sample is prepared into the holder and the mass is weighed with a balance (Ohaus Balance SN EO271119030112) [5] [10].In the third stage, the samples were measured using a Bartington Magnetic Susceptibility Meter MS2B type (Figure 2).The Bartington MS2B operates using a weak magnetic field of 80 A/m rms and can measure at a low frequency of 470 Hz and a high frequency of 4700 Hz.This tool can measure magnetic susceptibility values ranging from 1 x 10-6 to 9,999 x 10 -6 in cgs units or 1.26 x 10 -5 to 1.26 x 10 -1 in SI units (m3/kg).Measurements can be made based on mass specificity and volume.

Data
The holder used has a mass of about 4.144 grams and the susceptibility value of the main ingredients (table 1), and the susceptibility values of Rowmix 1 and Rowmix 2 (table 2).

Main Ingredients
From the sample measurements using the Bartington Magnetic Susceptibility Meter MS2B type, the magnetic susceptibility values of the main ingredients range from 23.7 x 10 -8 m 3 /kg-1791,1 x 10 -8 m 3 /kg.From these data, the lowest susceptibility value was found in Limestone material and the highest susceptibility value came from Irond Sand (Figure 3).Rowmix material is obtained from the main ingredients (Clay, Limestone, Silica, Irond Sand) which are mashed and homogenized.In the table above it can be seen that the value of the main material on 23 February ranged from 2838.6 x 10-8 m3/kg, on 24 February 2022 it ranged from 2336.5 x 10-8 m3/kg and on 25 February 2022 it ranged from 1532.9 x 10 -8 m3/kg.In Rowmix material, the magnetic susceptibility value is only in the tens to hundreds, while the main material has thousands of susceptibility values.

Conclusion
The Magnetic Susceptibility value of the main material on 23 February was around 2838.6 x 10 -8 m 3 /kg, on 24 February 2022 it was around 2336.5 x 10 -8 m 3 /kg and on 25 February 2022 it was around 1532.9 x10 -8 m 3 /kg.Meanwhile, the Rowmix 1 and Rowmis 2 materials only obtained magnetic susceptibility values ranging from 151.6 x 10 -8 m 3 /kg -244.2 x 10 -8 m 3 /kg.It can be concluded that the susceptibility value from the main ingredient to the Rowmix ingredient is inconsistent.

Table 1 .
Sample mass and magnetic susceptibility value of Main Material

Table 2 .
Sample mass and magnetic susceptibility values on Rowmix