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Method for determining calcium and magnesium ions in solution after chlorination of gasification slag and method for mineralizing solution after chlorination of gasification slag

A method for measuring calcium and magnesium ions, which is applied in the field of coal chemical industry, can solve the problems of difficulty in measuring the concentration of calcium and magnesium ions and large errors, and achieve the effect of retaining calcium ions, reducing content and reducing interference

Active Publication Date: 2020-09-15
CHINA ENERGY GRP NINGXIA COAL IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method for measuring calcium and magnesium ions in the chlorinated solution of gasification slag and a method for determining the concentration of calcium and magnesium ions in the gasification slag in order to overcome the problems existing in the prior art that the concentration of calcium and magnesium ions in the gasification slag is difficult to measure and the error is large. The mineralization method of the solution after slag chlorination, the determination method can significantly reduce the high concentration of impurity metal ions in the solution, avoid a large number of white flocs in the titration process, reduce interference, clearly judge the titration end point, and effectively retain calcium ions in the solution

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  • Method for determining calcium and magnesium ions in solution after chlorination of gasification slag and method for mineralizing solution after chlorination of gasification slag
  • Method for determining calcium and magnesium ions in solution after chlorination of gasification slag and method for mineralizing solution after chlorination of gasification slag

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preparation example Construction

[0032] In the present invention, the chlorinated solution of the gasified slag can be prepared by conventional preparation methods in the art, for example, the gasified slag can be dissolved with hydrochloric acid, so that Ca and Mg in the gasified slag can be dissolved by hydrochloric acid and enter the liquid phase to obtain The solution of gasification slag after chlorination. Preferably, the preparation method of the chlorinated gasification slag comprises: contacting the gasification slag and hydrochloric acid at 100-110°C for 1-3 hours, and then performing the second solid-liquid separation to obtain the chlorinated gasification slag The solution of the hydrochloric acid is used so that the pH of the solution after the gasification slag is chlorinated is 1-2. Wherein, the contacting is preferably carried out under oil bath conditions.

[0033] Wherein, the contacting process can be carried out under the condition of stirring, and the stirring rate is not particularly li...

Embodiment 1

[0082] This embodiment is used to illustrate the determination method of calcium and magnesium ion concentration in the solution after gasification slag chlorination of the present invention

[0083] Use a pipette to draw 10ml of the chlorinated solution of gasification slag and add 80ml of deionized water to mix in a conical flask, then heat to boil and slowly add excess ammonia water to adjust the pH to 5 for precipitation treatment, and centrifuge to obtain the clear liquid , add 25mL of buffer, 1g of indicator and 25mL of shielding agent to the clear solution; after mixing, titrate with disodium EDTA standard solution, and take the solution from purple red to sky blue as the titration end point.

[0084] Wherein, ICP-OES was used to measure the contents of metal elements in the chlorinated solution and clear liquid of the gasification slag respectively, and the specific results are shown in Table 1.

[0085] According to the titration formula, the concentration of calcium ...

Embodiment 2

[0094] This embodiment is used to illustrate the application of the method of the present invention in the mineralization of gasification slag

[0095] In the clear liquid that obtains in embodiment 1, add dropwise strong ammoniacal liquor (25-28%), maintain solution pH at about 10, pass into CO2 then 2 The gas is mineralized and then centrifuged to obtain a mineralized supernatant and the resulting carbonate product.

[0096] The chemical reactions carried out in this example are as follows:

[0097] Ca 2+ +CO 3 2- =CaCO 3 ↓

[0098] Mg 2+ +CO 3 2- =MgCO 3 ↓

[0099] Mg 2+ +2OH - =Mg(OH) 2 ↓

[0100] al 3+ +3OH - =Al(OH) 3 ↓

[0101] Use ICP-OES to measure the content of metal ions in the clear liquid after mineralization, after measuring the total amount of calcium and magnesium ions in the clear liquid after mineralization is 0.24mg / L, the carbonate product content that prepares (calculated as calcium carbonate Total) is 70.7%.

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Abstract

The invention relates to the field of coal chemical industry, and discloses a method for determining calcium and magnesium ions in a solution after chlorination of gasification slag and a method for mineralizing the solution after chlorination of gasification slag. The determination method comprises the following steps: (1) heating the solution obtained after chlorination of gasification slag to boiling, adding ammonia water to adjust the pH value to 5-7, and carrying out first solid-liquid separation to obtain a clear liquid; and (2) titrating the clear liquid by using an EDTA disodium standard solution, and calculating the concentration of calcium and magnesium ions in the clear liquid according to a titration formula to serve as the concentration of calcium and magnesium ions in the solution after chlorination of the gasification slag, wherein the pH value of the solution obtained after chlorination of the gasification slag is 1-2. By adopting the method, the content of high-concentration impurity metal ions can be remarkably reduced, calcium ions in the solution can be effectively retained, accurate data is provided for determining the total amount of Ca<2+> and Mg<2+> in the final mineralization solution, and the subsequent mineralization process is facilitated.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for measuring calcium and magnesium ions in a chlorinated solution of gasification slag and a method for mineralizing the solution of gasification slag after chlorination. Background technique [0002] "Rich in coal, poor in oil, and low in gas" is the status quo facing my country's energy development. As my country's oil resources become increasingly scarce, the development of "coal chemical industry" is of great significance to the adjustment of my country's energy structure. Therefore, coal gasification technology is gradually maturing, making my country The coal chemical industry has developed rapidly. Coal gasification technology is the core technology of the coal chemical industry, and a large amount of gasification slag is produced in the process of coal gasification. At present, the factory mainly treats gasification slag by landfill, which causes waste of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16C01F11/18C01F5/24
CPCG01N31/16C01F11/182C01F11/181C01F5/24
Inventor 王儒洋金政伟江尧刘洪刚齐志丽苏万里井云环杨磊
Owner CHINA ENERGY GRP NINGXIA COAL IND CO LTD
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