1 Scope This standard specifies the chemical analysis methods for various raw materials used in the production process. This standard applies to the chemical analysis of various raw materials used by the company. 2 reference standard sampling method 3 quartz sand chemical analysis method 3.1 preparation of the sample according to the "sampling method" after sampling, the sample size is as thick as 80 #, using the quartering method to shrink to about 10g placed in the mortar and research into fine all through 100# ( 150um) with a magnetic iron absorption repeated at least 5, after the iron-free sample was poured into the bag, at 100-105 deg.] C drying oven, desiccator drying one hour cool reserve 3.2 LOI measurement sample was weighed 1 g about 900-950 degrees burning was placed into the crucible inner Platinum constant weight weighed and then calcined for 1 hour at 900-950 deg.] C in a high temperature furnace, put out in a desiccator to cool to room temperature ,, weighing Repeated burning to constant weight calculation: % reduction = (G1-G2) / G * 100% G1: Weight of the sample before twisting G2: Weight of the sample after burning: G: Sample Weight 3.3 Silica SIO2 Determination 3.3.1 Analytical Reagents 3.3.1.1 Sulfuric Acid (1+1) 3.3.1.2 Hydrofluoric Acid 3.3.2 Analytical Procedure Weigh about 0.5 g of sample and place it at 900-950 °C for burning to constant Weighed in heavy platinum crucible, wet with a small amount of water, add 8-10 drops of sulfuric acid (H2SO4) (1+1), 5 ml of hydrofluoric acid (HF), slowly evaporate to dryness on sand bath or hot plate. In hydrogenation of fluorine (HF) 10 ml, repeated evaporation to sulfur trioxide (SO3) white smoke exhausted, placed in a high temperature furnace 900-950 ° C, burned for 30 minutes, taken out, cooled in a desiccator, weighed, continue to burn to constant weight . Calculation: SIO2%=(G1-G2)/G*100% G1: Weight of the sample before twisting G2: Weight of the sample after burning G: Weight of the sample 3.4 Determination of ferric oxide: 3.4.1 Reagents 3.4.1.1 Hydrochloric acid (5:95) 3.4.1.2 Ammonia (1:1) 3.4.1.3 Sulfosalicylic acid (15%) 3.4.1.4 Diferric oxide standard solution (0.1mg/ml) Take 0.1000 g of dried ferric oxide (spectrum pure reagent), place it in a 250 ml beaker, add 30 ml of hydrochloric acid (1:1), dissolve it by heating, cool it, transfer it to a 1000 ml volumetric flask, dilute with water to the mark. Shake well to be a standard solution of ferric oxide. (1 ml of this solution contains 0.1 mg of ferric oxide.) 3.4.3 Analytical procedure: Add 4-5 g of potassium pyrosulfate to the residue of silica. Put it in a high-temperature furnace at 600-650 °C for 15-20 minutes in dissolved state, take it out and cool it, put it into a 250 ml beaker, add 40 ml (1:20) hydrochloric acid (HCL), heat and dissolve at low temperature. Transfer to a 100 ml volumetric flask and dilute with water. Dilute 10 ml of this solution into a 50 ml volumetric flask and add 10 ml of sulfosalicylic acid (15%). Add ammonia (1:1) to stabilize. Color, in an excess of 3 ml, cool, dilute to the mark with water, shake well, use water as a reference solution, measure the absorbance at a wavelength of 420 nm with a 1 cm cuvette, and do the blank test in the same way, subtract the absorbance of the blank test After that, the content of ferric oxide was found on the working curve. 3.4.4 Working curve was drawn by pipetting 10 ml of hydrochloric acid (5; 95) into 7 50 ml volumetric flasks and then in a volumetric flask. In the middle, a millititer tube was added with 0.00 ml of a standard solution of ferric oxide. 0.5 ml, 1.00 ml, 2.00 ml, 4.00 ml, 6.00 ml, 8.00 ml. The following steps are carried out according to the analysis step method. After measuring the absorbance minus the absorbance of the blank solution, corresponding to the relative mass of ferric oxide, the working curve is calculated: Fe2O3%=(?m2/(m1*(V2/V1))*100 % m2: The value of ferric oxide is found from the working curve (g) m1: the weight of the sample is weighed (g) V1: the total volume of the filtrate prepared (ML) v2: the number of milliliters of filtrate removed (ML ) Annealing Furnace,Pit Annealing Furnace,Vacuum Annealing Furnace,Roller Annealing Furnace Zhejiang Shangding Industrial Furnace Co., Ltd , https://www.sdindustrialfurnace.com