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Method for reducing concentration of calcium ions in calcium-containing solution

A calcium ion and solution technology, applied in chemical instruments and methods, water/sewage treatment, chemical/physical/physicochemical processes, etc., to achieve high product quality, convenient operation, and simple separation steps

Inactive Publication Date: 2015-07-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the existing decalcification methods, and provide a decalcification method that can easily realize solid-liquid separation, will not cause corrosion to equipment, and will not pollute the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add common vanadium solution A in 1000ml table 1 in 2000ml clean beaker, use the dilute hydrochloric acid that concentration is 10% (mass) to adjust its pH to be 5, be heated to 60 ℃, stir, add 1.89g ammonium oxalate, after reacting for 20min, The pH is 5.2, and the calcium ion content is 0.02g / L. Then add 2ml of polyacrylamide (weight-average molecular weight greater than 3 million, non-ionic) solution and 0.13g of activated carbon (specific surface area 1000m2) with a concentration of 5g / L 2 / g, particle size is less than 50 μm), reacted for 20min, settled and filtered to obtain a low-calcium vanadium solution with a calcium content of 0.005g / L.

Embodiment 2

[0028] Add 1000ml of common vanadium solution A in Table 1 to a 2000ml clean beaker, use dilute hydrochloric acid with a concentration of 10% (mass) to adjust its pH to 10, heat to 60°C, stir, add 6.1g sodium oxalate, and react for 100min. The pH is 10.22, and the calcium ion content is 0.01g / L. Add 4ml of polyacrylamide (weight-average molecular weight greater than 8 million, non-ionic) solution with a concentration of 10g / L and 1.2g of activated carbon (with a specific surface area of ​​2000m 2 / g, particle size is less than 40 μm), reacted for 60min, settled and filtered to obtain a low-calcium vanadium solution with a calcium content of 0.004g / L.

Embodiment 3

[0030] Add common vanadium solution A in 1000ml table 1 in 2000ml clean beaker, use the dilute hydrochloric acid that concentration is 10% (mass) to adjust its pH to be 9, be heated to 90 ℃, stir, add 5.06g potassium oxalate, after reacting for 30min, The pH is 9.25, and the calcium ion content is 0.01g / L. Add 2ml of polyacrylamide (weight-average molecular weight greater than 3 million, non-ionic) solution with a concentration of 8g / L and 0.24g of activated carbon (with a specific surface area of ​​1500m 2 / g, particle size is less than 50 μm), reacted for 60min, settled and filtered to obtain a low-calcium vanadium solution with a calcium content of 0.005g / L.

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Abstract

The invention discloses a method for reducing the concentration of calcium ions in a calcium-containing solution. The method comprises the following steps: carrying out first contact of the calcium-containing solution and a calcium binder under a first contact condition, carrying out second contact of the product obtained after the first contact and a calcium separating agent under a second contact condition, and carrying out solid-liquid separation of the product obtained after the second contact, wherein the calcium binder is a substance which reacts with the calcium ions to form a precipitate, the calcium separating agent is a substance which enables the precipitate to aggregate, the first contact condition enables the content of the calcium ions in the product obtained after the first contact to be reduced to below 0.02g / L, and the second contact condition enables the content of calcium in the solution obtained after the second contact to be reduced to below 0.008g / L. The method has the advantages of convenient operation, simple technology, low equipment requirement, low cost, easy industrial application, low requirements of solution components, wide application range, good calcium removal effect and high product quality.

Description

technical field [0001] The invention relates to a method for reducing the concentration of calcium ions in a calcium-containing solution. Background technique [0002] Calcium is widely distributed in nature. Metallurgy, chemical industry, medicine, energy and environmental protection and other industries are all involved in decalcification process. Especially with the development of denitrification catalyst, the requirements for calcium content in ammonium metavanadate are getting higher and higher. The requirements of the method are becoming more and more stringent. [0003] Sodium carbonate and other carbonates are usually used to remove calcium in calcium-containing solutions. This method not only has poor effect, but also has disadvantages such as difficult sedimentation and easy penetration and filtration. [0004] Hou Xingang's article "Reduction and Deep Purification of Jarosite Slag Leach Solution" published in the Journal of Lanzhou University of Technology mentio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/00C02F1/58
Inventor 殷兆迁李千文孙朝晖曹鹏
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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