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Method for determining harmful elements in iron ore

A technology of harmful elements and determination methods, which is applied in the direction of measuring devices, test sample preparation, instruments, etc., can solve the problems of cumbersome workload and inaccurate determination of trace elements, etc., and achieve the goal of overcoming mutual influence, good determination stability, Simple operation effect

Active Publication Date: 2020-06-05
通标标准技术服务(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The workload of sodium, potassium, lead and zinc is cumbersome to measure separately, and the determination of some trace elements is not accurate enough when they are measured at the same time

Method used

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  • Method for determining harmful elements in iron ore
  • Method for determining harmful elements in iron ore
  • Method for determining harmful elements in iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1. Pretreatment of the iron ore sample to be tested: the iron ore to be tested is the standard product GSBH3006-97, and its content of Na, K, Pb, and Zn is 0.0378%, 0.0332%, 0.0015%, and 0.0093% and accurately weighed Put 0.1g of the iron ore sample to be tested in a microwave digestion tank, the first step: add 1mL of hydrochloric acid, 6mL of nitric acid, and 0.02g of graphite in sequence; place the microwave digestion tank in a microwave digestion instrument, turn on the microwave digestion It is set as: power is 1600W, temperature is 190°C, heating program is 2min to 190°C, constant temperature is 5min to start cooling; the second step: add 3mL of nitric acid and 1mL of hydrofluoric acid in sequence, and the concentration of nitric acid added in the second step If the concentration of nitric acid is lower than that in the first step, place the microwave digestion tank in the microwave digestion instrument, turn on the microwave digestion instrument, set the prog...

Embodiment 2

[0047] Step 1. Pretreatment of the iron ore sample to be tested: accurately weigh 0.1 g of the iron ore sample to be tested and place it in a microwave digestion tank. The first step: add 1 mL of hydrochloric acid, 6 mL of nitric acid, and 0.02 g of graphite in sequence; Put the tank in the microwave digestion apparatus, turn on the microwave digestion apparatus, set the program as follows: power is 1600W, temperature is 190°C, the heating program is 2min to 190°C, constant temperature 5min to start cooling; the second step: add nitric acid in sequence 3mL, 1mL hydrofluoric acid, and the concentration of nitric acid added in the second step is lower than the concentration of nitric acid added in the first step, put the microwave digestion tank in the microwave digestion instrument, turn on the microwave digestion instrument, and set the program as: power The temperature is 1000W, the temperature is 120°C, the heating program is 5min to 120°C, and the constant temperature is 15m...

Embodiment 3

[0056] Step 1. Pretreatment of the iron ore sample to be tested: accurately weigh 0.1 g of the iron ore sample to be tested and place it in a microwave digestion tank. Step 1: Add 1 mL of hydrochloric acid, 4 mL of nitric acid, 0.03 g of graphite, and nano-ceramic particles 0.02g; put the microwave digestion tank in the microwave digestion instrument, turn on the microwave digestion instrument, set the program as follows: power 1600W, temperature 190°C, heating program: 2min to 190°C, constant temperature 5min to start cooling; second Step 1: Add 2 mL of nitric acid and 1 mL of hydrofluoric acid in sequence, and the concentration of nitric acid added in the second step is lower than that of the first step. Place the microwave digestion tank in the microwave digestion apparatus, turn on the microwave digestion apparatus, and The program is set as follows: the power is 1000W, the temperature is 120°C, the temperature rise program is 5min to 120°C, the temperature is constant for ...

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Abstract

The invention discloses a method for determining harmful elements in iron ore. The method comprises the following steps: 1, pretreating an iron ore sample to be determined; 2, drawing a standard curve; 3, predicting the iron ore sample to be determined; 4, accurately measuring the iron ore sample to be determined: taking four 10 mL volumetric flasks, adding 1mL of pretreatment liquid obtained in the step 1 into each container, sequentially adding 10mu g / mL of Na, K, Pb and Zn mixed standard solution with the calibration volume L into the four volumetric flasks, wherein L is equal to 0.1 mL, 0.3 mL, 0.3 mL and 0.5 mL, fixing the volume, respectively determining the concentrations Cm of Na, K, Pb and Zn elements, and performing calculating according to a formula to obtain the accurately determined concentrations Ci of Na, K, Pb and Zn elements in the iron ore sample to be determined; and averaging the obtained four solubilities and the predicted concentration Cr of a certain element in the iron ore sample obtained in the step 3 to obtain the concentration of each element in the iron ore sample to be determined. According to the method, four harmful elements including sodium, potassium, lead and zinc in the iron ore can be simultaneously determined, and the determination stability of trace elements is good.

Description

technical field [0001] The invention relates to a method for determining harmful elements. More specifically, the present invention relates to a method for determining harmful elements in iron ore. Background technique [0002] According to the requirements of trade contracts, iron ore detection usually detects the content of elements such as iron, silicon, aluminum, calcium, magnesium, sulfur, phosphorus, etc. Elements are also a must-test item for major companies. Among them, sodium, potassium, lead, and zinc are reduced to corresponding elements in the blast furnace during the blast furnace smelting process. Due to the low boiling point, they will become Volatilizes into steam, and as the gas rises, a small part escapes out of the furnace with the gas, and the rest condenses in the lower temperature area of ​​the upper part of the blast furnace, and is oxidized into corresponding oxides, and some oxides fall with the charge or slag iron and then It is reduced to element...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/44
CPCG01N27/626G01N1/44Y02P10/20
Inventor 王春林杨宇红
Owner 通标标准技术服务(天津)有限公司
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