Method for accurately measuring content of soluble suspended matters in sodium aluminate solution

Abstract

The invention discloses a method for accurately measuring the content of soluble suspended matters in a sodium aluminate solution, which comprises the following steps: (1) taking two parts of sodium aluminate solution in an aluminum oxide production process as two parts of samples, and keeping the temperature, the two parts of sodium aluminate solution being equal in amount; (2) filtering one sample to obtain filtrate and suspended matters; (3) adding ultrapure water into the other part of the sample, diluting to obtain a diluent, heating the diluent to 60 DEG C, stirring while heating until the solution is clarified, and then filtering to obtain filtrate and solid residues; (4) further comprising the following steps: a, drying the suspended matters in the step (2), weighing to obtain the total amount of the suspended matters, drying the solid residues in the step (3), and weighing to obtain the mass of insoluble suspended matters; calculating the content of the soluble suspended matters by adopting the following formula: the mass of the soluble suspended matters = the total amount of the suspended matters-the mass of the insoluble suspended matters; according to the method, the content of the soluble suspended matters in the sodium aluminate solution is accurately measured.

Description

Technical Field

[0001] The invention relates to the field of sodium aluminate solution component detection, and in particular to a method for accurately determining the content of soluble suspended matter in the sodium aluminate solution. Background Art

[0002] In the alumina production process, bauxite ore is the core raw material, and its quality directly affects the smoothness of the entire production process. As the domestic mining activities of mineral resources are becoming more and more in-depth, the quality of the ore is gradually declining, and the impurity content is increasing year by year. This phenomenon forces the alumina industry to face and adapt to the use of high-impurity ores. However, the increase of high-sulfur and high-carbon ores has significantly changed the chemical and physical properties of the sodium aluminate solution, and floating matter will precipitate on the surface of the sodium aluminate solution. The floating matter includes insoluble floating matter and soluble floating matter. The soluble floating matter includes soluble total alkali, soluble alumina and soluble caustic alkali. The precipitation of soluble floating matter will affect the product quality and bring severe challenges to the alumina production process. Therefore, accurately analyzing and characterizing the content of soluble floating matter and the content of its various components, adjusting the parameters in the alumina production process, such as temperature, concentration, etc., through the content of soluble floating matter and the content of its various components, to reduce the generation of floating matter, can ensure the stability of product quality. The existing technology can only detect the content of suspended matter. The detection method is to obtain the content of suspended matter by filtering, washing, drying and weighing the sodium aluminate solution in the alumina production process. However, the content of the suspended matter is inaccurate because part of the soluble total alkali, soluble alumina and soluble caustic soda are washed away during the washing, making the detection result lower than the actual one. Another detection method is to obtain the content of suspended matter by filtering, drying and weighing the sodium aluminate solution in the alumina production process. However, the content of the suspended matter is also inaccurate because part of the substances in the sodium aluminate solution are attached to the suspended matter, making the detection result higher. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a method for accurately measuring the content of soluble suspended matter in a sodium aluminate solution.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A method for accurately determining the content of soluble suspended matter in a sodium aluminate solution comprises the following steps:

[0006] (1) taking two portions of sodium aluminate solution from the alumina production process as two samples and keeping them warm, the two portions of sodium aluminate solution being equal in volume;

[0007] (2) filtering a sample to obtain a filtrate and a suspended solid;

[0008] (3) diluting another sample with ultrapure water to obtain a dilution solution, heating the dilution solution to 60° C., stirring while heating until the solution is clear, and then filtering to obtain a filtrate and a solid residue;

[0009] (4) further comprising one or both of step a and step b:

[0010] a. drying and weighing the suspended matter in step (2) to obtain the total amount of the suspended matter, and drying and weighing the solid residue in step (3) to obtain the mass of the insoluble suspended matter;

[0011] The soluble plankton content was calculated using the following formula:

[0012] The mass of soluble plankton = the total amount of plankton - the mass of insoluble plankton;

[0013] b. Performing a standard sodium aluminate solution component analysis on the filtrate in step (2) to obtain the original total alkali content, the original alumina content and the original caustic soda content; performing a standard sodium aluminate solution component analysis on the filtrate in step (3) to obtain the total alkali content after dissolution, the alumina content after dissolution and the caustic soda content after dissolution, and calculating the content of each component of the soluble suspended matter using the following formula:

[0014] Total soluble alkali content = total alkali content after dissolution - original total alkali content;

[0015] Soluble alumina amount = dissolved alumina amount - original alumina amount;

[0016] Soluble caustic soda amount = dissolved caustic soda amount - original caustic soda amount.

[0017] The soluble suspended matter content is calculated using the following formula: soluble suspended matter content = total soluble alkali content + soluble alumina content.

[0018] Furthermore, the amount of the ultrapure water is at least half of that of the other sample.

[0019] Furthermore, the step (1) is specifically as follows: during the alumina production process, first open the discharge valve to allow the material to flow for 1-2 minutes, then adjust the discharge valve to achieve a suitable flow rate, and use two samplers with insulation function to be placed under the discharge port to collect 200 ml of sodium aluminate solution each.

[0020] The beneficial effects of the present invention are:

[0021] The present invention discloses a method for accurately determining the content of soluble suspended matter in a sodium aluminate solution. The method comprises the following steps: taking two samples, directly filtering one sample to obtain a filtrate and suspended matter, drying and weighing the suspended matter to obtain the total amount of suspended matter, wherein the total amount of suspended matter includes soluble suspended matter and insoluble suspended matter, wherein the soluble suspended matter includes soluble total alkali, soluble alumina and soluble caustic soda, and performing a standard sodium aluminate solution component analysis on the filtrate to obtain the original total alkali amount, the original alumina amount and the original caustic soda amount. Another sample was diluted and heated and stirred to dissolve the soluble suspended matter in the sodium aluminate solution. The filtrate (containing soluble suspended matter) and solid residue were then filtered to obtain the filtrate. The solid residue was dried and weighed to obtain the mass of insoluble suspended matter. The total amount of suspended matter - the mass of insoluble suspended matter = the mass of soluble suspended matter (weighed). The filtrate was subjected to standard sodium aluminate solution component analysis to obtain the total alkali amount after dissolution, the amount of alumina after dissolution and the amount of caustic soda after dissolution. The total alkali amount after dissolution - the original total alkali amount = the total soluble alkali amount, the amount of alumina after dissolution - the original alumina amount = the soluble alumina amount, the amount of caustic soda after dissolution - the original caustic soda amount = the soluble caustic soda amount, the total soluble alkali amount + the soluble alumina amount + the soluble caustic soda amount = the soluble suspended matter content (calculated). The calculated soluble suspended matter content was consistent with the weighed soluble suspended matter mass, verifying the feasibility of this method.

[0022] This method has the following beneficial effects:

[0023] 1. Improved detection accuracy: The method provided by the present invention can more accurately analyze the soluble floating matter and the content of each component in the sodium aluminate solution, thereby improving the overall detection accuracy and reliability.

[0024] 2. Optimized the production process: By accurately evaluating the content of soluble suspended matter in the sodium aluminate solution, the parameters in the production process, such as temperature and concentration, can be adjusted in time to reduce the generation of suspended matter and improve product quality.

[0025] 3. Cost savings: Since the present invention can accurately detect the content of soluble suspended matter in the sodium aluminate solution, it can avoid the waste of raw materials caused by excessive processing, thereby reducing production costs.

[0026] 4. Improved product quality: Accurately controlling the quality of sodium aluminate solution helps to improve the purity and performance of downstream alumina products, thereby enhancing the market competitiveness of the overall product.

[0027] In summary, the present invention provides an accurate and efficient detection method to ensure the quality control of sodium aluminate solution in the alumina production process, thereby ensuring the quality stability and production efficiency of the final product.

[0028] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description and claims. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in detail below. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.

[0030] Embodiment 1

[0031] A method for accurately determining the content of soluble suspended matter in a sodium aluminate solution comprises the following steps:

[0032] (1) During the alumina production process, first open the discharge valve and allow the material to flow for 1-2 minutes to clear the residue in the pipeline. Then adjust the discharge valve to achieve a suitable flow rate to avoid material splashing. Use two samplers with insulation function to be placed under the discharge port and collect 200 ml of sodium aluminate solution as two samples;

[0033] (2) filtering a sample to obtain a filtrate and a suspended solid;

[0034] (3) Dilute another sample with ultrapure water at a ratio of 2:1 (adding less water will result in incomplete dissolution, but adding more water will achieve the same effect) to obtain a diluent, heat the diluent to 60°C (production temperature), and stir while heating until the solution becomes clear and the soluble suspended matter is fully dissolved (this process can be called anti-dissolution); then filter to obtain a filtrate (containing the soluble suspended matter) and a solid residue;

[0035] (4) also includes step a

[0036] a. drying and weighing the suspended matter (including soluble suspended matter and insoluble suspended matter, wherein the soluble suspended matter includes soluble total alkali, soluble alumina and soluble caustic soda) in step (2) to obtain the total amount of the suspended matter, and drying and weighing the solid residue in step (3) to obtain the mass of the insoluble suspended matter;

[0037] The soluble plankton content was calculated using the following formula:

[0038] The mass of soluble plankton = the total amount of plankton - the mass of insoluble plankton.

[0039] Embodiment 2

[0040] A method for accurately determining the content of soluble suspended matter in a sodium aluminate solution comprises the following steps:

[0041] (1) During the alumina production process, first open the discharge valve and allow the material to flow for 1-2 minutes to clear the residue in the pipeline. Then adjust the discharge valve to achieve a suitable flow rate to avoid material splashing. Use two samplers with insulation function to be placed under the discharge port and collect 200 ml of sodium aluminate solution as two samples;

[0042] (2) filtering a sample to obtain a filtrate and a suspended solid;

[0043] (3) Dilute another sample with ultrapure water at a ratio of 2:1 (adding less water will result in incomplete dissolution, but adding more water will achieve the same effect) to obtain a diluent, heat the diluent to 60°C (production temperature), and stir while heating until the solution becomes clear and the soluble suspended matter is fully dissolved (this process can be called anti-dissolution); then filter to obtain a filtrate (containing the soluble suspended matter) and a solid residue;

[0044] (4) also includes step b

[0045] b. Performing a standard sodium aluminate solution component analysis on the filtrate in step (2) (the filtrate does not contain suspended matter) to obtain the original total alkali content, the original alumina content and the original caustic soda content; performing a standard sodium aluminate solution component analysis on the filtrate in step (3) (the filtrate contains soluble suspended matter) to obtain the total alkali content after dissolution, the alumina content after dissolution and the caustic soda content after dissolution; and calculating the content of each component of the soluble suspended matter using the following formula:

[0046] Total soluble alkali content = total alkali content after dissolution - original total alkali content;

[0047] Soluble alumina amount = dissolved alumina amount - original alumina amount;

[0048] Soluble caustic soda amount = dissolved caustic soda amount - original caustic soda amount.

[0049] The soluble suspended matter content is calculated using the following formula: soluble suspended matter content = soluble total alkali content + soluble alumina content. The standard component analysis of sodium aluminate solution is spectral analysis, which is a prior art and this application merely utilizes it.

[0050] Embodiment 3

[0051] A method for accurately determining the content of soluble suspended matter in a sodium aluminate solution comprises the following steps:

[0052] (1) During the alumina production process, first open the discharge valve and allow the material to flow for 1-2 minutes to clear the residue in the pipeline. Then adjust the discharge valve to achieve a suitable flow rate to avoid material splashing. Use two samplers with insulation function to be placed under the discharge port and collect 200 ml of sodium aluminate solution as two samples;

[0053] (2) filtering a sample to obtain a filtrate and a suspended solid;

[0054] (3) Dilute another sample with ultrapure water at a ratio of 2:1 (adding less water will result in incomplete dissolution, but adding more water will achieve the same effect) to obtain a diluent, heat the diluent to 60°C (production temperature), and stir while heating until the solution becomes clear and the soluble suspended matter is fully dissolved (this process can be called anti-dissolution); then filter to obtain a filtrate (containing the soluble suspended matter) and a solid residue;

[0055] (4) Also includes step a and step b

[0056] a. drying and weighing the suspended matter (including soluble suspended matter and insoluble suspended matter, wherein the soluble suspended matter includes soluble total alkali, soluble alumina and soluble caustic soda) in step (2) to obtain the total amount of the suspended matter, and drying and weighing the solid residue in step (3) to obtain the mass of the insoluble suspended matter;

[0057] The soluble plankton content was calculated using the following formula:

[0058] The mass of soluble plankton = the total amount of plankton - the mass of insoluble plankton;

[0059] b. Performing a standard sodium aluminate solution component analysis on the filtrate in step (2) (the filtrate does not contain suspended matter) to obtain the original total alkali content, the original alumina content and the original caustic soda content; performing a standard sodium aluminate solution component analysis on the filtrate in step (3) (the filtrate contains soluble suspended matter) to obtain the total alkali content after dissolution, the alumina content after dissolution and the caustic soda content after dissolution; and calculating the content of each component of the soluble suspended matter using the following formula:

[0060] Total soluble alkali content = total alkali content after dissolution - original total alkali content;

[0061] Soluble alumina amount = dissolved alumina amount - original alumina amount;

[0062] Soluble caustic soda amount = dissolved caustic soda amount - original caustic soda amount.

[0063] The soluble suspended matter content is calculated using the following formula: soluble suspended matter content = soluble total alkali content + soluble alumina content. The standard component analysis of sodium aluminate solution is spectral analysis, which is a prior art and this application merely utilizes it.

[0064] Taking a mother liquor (i.e. sodium aluminate solution) in the alumina production process as an example, the same sampling point was tested at 6 different times according to the method of this embodiment. The test results are shown in Table 1:

[0065] Table 1

[0066]

[0067]

[0068] It can be seen from the above table that the soluble suspended matter calculated after desolvation (soluble suspended matter = total soluble alkali content + soluble alumina content) is consistent with the weighed soluble suspended matter (mass of soluble suspended matter = total amount of suspended matter - mass of insoluble suspended matter), which proves that this method can be used.

[0069] By using this method in this embodiment, the content of soluble suspended matter and the content of each component in the sodium aluminate solution can be accurately evaluated, thereby providing a scientific basis for quality control in the alumina production process.

[0070] Embodiment 4

[0071] A method for accurately determining the content of soluble suspended matter in a sodium aluminate solution comprises the following steps:

[0072] (1) During the alumina production process, first open the discharge valve and allow the material to flow for 1-2 minutes to clear the residue in the pipeline. Then adjust the discharge valve to achieve a suitable flow rate to avoid material splashing. Use two samplers with insulation function to be placed under the discharge port and collect 200 ml of sodium aluminate solution as two samples;

[0073] (2) filtering a sample to obtain a filtrate and a suspended solid;

[0074] (3) Dilute another sample with ultrapure water at a ratio of 2:1.5 (adding less water will result in incomplete dissolution, but adding more water will achieve the same effect) to obtain a diluent, heat the diluent to 60°C (production temperature), and stir while heating until the solution becomes clear and the soluble suspended matter is fully dissolved (this process can be called anti-dissolution); then filter to obtain a filtrate (the filtrate contains soluble suspended matter) and a solid residue;

[0075] (4) Also includes step a and step b

[0076] a. drying and weighing the suspended matter (including soluble suspended matter and insoluble suspended matter, wherein the soluble suspended matter includes soluble total alkali, soluble alumina and soluble caustic soda) in step (2) to obtain the total amount of the suspended matter, and drying and weighing the solid residue in step (3) to obtain the mass of the insoluble suspended matter;

[0077] The soluble plankton content was calculated using the following formula:

[0078] The mass of soluble plankton = the total amount of plankton - the mass of insoluble plankton;

[0079] b. Performing a standard sodium aluminate solution component analysis on the filtrate in step (2) (the filtrate does not contain suspended matter) to obtain the original total alkali content, the original alumina content and the original caustic soda content; performing a standard sodium aluminate solution component analysis on the filtrate in step (3) (the filtrate contains soluble suspended matter) to obtain the total alkali content after dissolution, the alumina content after dissolution and the caustic soda content after dissolution; and calculating the content of each component of the soluble suspended matter using the following formula:

[0080] Total soluble alkali content = total alkali content after dissolution - original total alkali content;

[0081] Soluble alumina amount = dissolved alumina amount - original alumina amount;

[0082] Soluble caustic soda amount = dissolved caustic soda amount - original caustic soda amount.

[0083] The soluble suspended matter content is calculated using the following formula: soluble suspended matter content = soluble total alkali content + soluble alumina content. The standard component analysis of sodium aluminate solution is spectral analysis, which is a prior art and this application merely utilizes it.

[0084] Taking a strong alkaline solution (i.e. sodium aluminate solution) in the alumina production process as an example, the same sampling point was tested at 6 different times according to the method of this embodiment. The test results are shown in Table 2:

[0085] Table 2

[0086]

[0087]

[0088]

[0089] It can be seen from the above table that the soluble suspended matter calculated after desolvation (soluble suspended matter = total soluble alkali content + soluble alumina content) is consistent with the weighed soluble suspended matter (mass of soluble suspended matter = total amount of suspended matter - mass of insoluble suspended matter), which proves that this method can be used.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for accurately determining the content of soluble suspended matter in sodium aluminate solution, characterized in that: The steps include: (1) Take two portions of sodium aluminate solution from the alumina production process as two samples and keep them warm. The two portions of sodium aluminate solution are equal in volume; (2) filtering a sample to obtain a filtrate and a suspended solid; (3) Dilute another sample with ultrapure water to obtain a diluent, heat the diluent to 60°C, stir while heating until the solution becomes clear, and then filter to obtain a filtrate and a solid residue; (4) Also includes one or both of step a and step b: a. drying and weighing the suspended matter in step (2) to obtain the total amount of the suspended matter, and drying and weighing the solid residue in step (3) to obtain the mass of the insoluble suspended matter; The soluble plankton content was calculated using the following formula: The mass of soluble suspended matter = the total amount of suspended matter - the mass of insoluble suspended matter; b. Perform a standard sodium aluminate solution component analysis on the filtrate in step (2) to obtain the original total alkali content, the original alumina content and the original caustic soda content. Perform a standard sodium aluminate solution component analysis on the filtrate in step (3) to obtain the total alkali content after dissolution, the alumina content after dissolution and the caustic soda content after dissolution. The content of each component of soluble suspended matter is calculated using the following formula: Total soluble alkali content = total alkali content after dissolution - original total alkali content; Soluble alumina amount = dissolved alumina amount - original alumina amount; Soluble caustic soda amount = dissolved caustic soda amount - original caustic soda amount; The soluble suspended matter content is calculated using the following formula: soluble suspended matter content = total soluble alkali content + soluble alumina content.

2. The method for accurately determining the content of soluble suspended matter in sodium aluminate solution according to claim 1, characterized in that: The amount of ultrapure water is at least half of that of the other sample.

3. The method for accurately measuring the content of soluble suspended matter in sodium aluminate solution according to claim 1, characterized in that: The step (1) is specifically as follows: during the alumina production process, firstly, open the discharge valve to allow the material to flow for 1-2 minutes, then adjust the discharge valve to achieve a suitable flow rate, and use two samplers with insulation function to be placed under the discharge port to collect 200 ml of sodium aluminate solution each.

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