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Method for determining total iron by titanium trichloride

A technology of titanium trichloride and potassium dichromate, which is applied in the direction of material analysis by observing the impact on chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of excessive discharge concentration and waste of water resources. , to achieve the effect of less environmental pollution, reduced pollution and high qualification rate

Inactive Publication Date: 2012-06-27
攀枝花钢企米易白马球团有限公司
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Problems solved by technology

The waste liquid of this method contains 0.0606mg / L of mercury, and the discharge concentration of mercury must not exceed 0.05mg / L according to the national regulations. If the direct discharge will cause the discharge concentration to exceed the standard, a large amount of water needs to be added to dilute it to meet the national standard, which will cause water pollution. huge waste of resources

Method used

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Examples

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Embodiment 1

[0028] Weigh 0.2002g iron ore concentrate standard sample (total iron content is 45%), 2g sodium peroxide, 1g sodium carbonate, mix the three raw materials, melt at 800°C for about 15min, and cool. Use 20mL of mixed acid for leaching for 2 hours. The mixed acid is prepared by slowly injecting 150mL of sulfuric acid (1.84g / L) into 700mL of water and adding 150mL of phosphoric acid (1.7g / mL).

[0029] Using sodium tungstate solution (250g / L) as indicator, add titanium trichloride solution (mass concentration: 15%) dropwise into the leaching solution until blue color appears and excess 1 or 2 drops, then add dilute dichromic acid dropwise Potassium solution (0.5g / L) until the blue color disappears. Add 5 drops of sodium diphenylamine sulfonate solution (2g / L) and titrate with potassium dichromate standard solution (0.05000mol / L) until it becomes stable purple. The total iron content is calculated as 45.02% based on the consumed standard solution volume. The calculated value is ...

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Abstract

The invention belongs to the technical field of methods for determining total iron and particularly relates to a method for determining total iron by titanium trichloride. The invention aims to solve the technical problems and provide the method for determining the total iron by the titanium trichloride, which has simple and convenient process without discharging toxic substances. The method for determining the total iron by the titanium trichloride comprises the following steps: (1) melting a sample and then leaching the smelt sample by acid; (2) by adopting sodium tungstate as an indicator, adding the titanium trichloride into the leached solution until tungsten blue is generated, and dropping potassium dichromate solution until the blue is disappearer; and (3) by adopting sodium diphenylamine sulfonate as an indicator, performing titration with potassium dichromate standard solution, and calculating the content of the total iron according to consumption volume of the potassium dichromate standard solution. The method for titration of the total iron by the titanium trichloride has the advantages of more accurate measuring result, higher qualified rate and less analytical error.

Description

technical field [0001] The invention belongs to the technical field of determination methods for total iron, in particular to a method for determining total iron with titanium trichloride. Background technique [0002] The current method for determining total iron is to first reduce ferric iron to ferrous iron with tin dichloride, and then oxidize excess tin dichloride with mercuric chloride. The waste liquid of this method contains 0.0606mg / L of mercury, and the discharge concentration of mercury must not exceed 0.05mg / L according to the national regulations. If the direct discharge will cause the discharge concentration to exceed the standard, a large amount of water needs to be added to dilute it to meet the national standard, which will cause water pollution. Great waste of resources. Therefore, the current method for the determination of total iron urgently needs to be improved. Contents of the invention [0003] The technical problem to be solved by the present inv...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 熊辉陈兴红张文能苏兵张俊蜂罗小莉
Owner 攀枝花钢企米易白马球团有限公司
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