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A kind of method for reducing calcium ion concentration in calcium-containing solution

A calcium ion and solution technology is applied in the field of reducing the calcium ion concentration in a calcium-containing solution, and achieves the effects of easy popularization and application, loose requirements for solution components, and convenient operation.

Inactive Publication Date: 2014-10-01
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 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 5, heat to 60°C, stir, add 1.89g of ammonium carbonate, react for 20min, The pH was 5.2, and the calcium ion content was 0.02 g / L. Then add 2ml of polyacrylamide (weight average molecular weight greater than 3 million, non-ionic) solution with a concentration of 5g / L and 0.13g of activated carbon (specific surface area of ​​1000m2) 2 / g, the particle size is less than 50 μm), react for 20 min, settle and filter to obtain a low calcium vanadium solution with a calcium content of less than 0.005 g / L.

Embodiment 2

[0028] Add 1000ml of common vanadium solution A in Table 1 to a 2000ml clean beaker, adjust its pH to 10 with dilute hydrochloric acid with a concentration of 10% (mass), heat to 60°C, stir, add 6.1g of sodium carbonate, react for 100min, The pH was 10.22, and the calcium ion content was 0.01 g / 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 (specific surface area 2000m 2 / g, the particle size is less than 40 μm), react for 60 min, settle and filter to obtain a low calcium vanadium solution with a calcium content below 0.004 g / L.

Embodiment 3

[0030] Add 1000ml of common vanadium solution A in Table 1 to a 2000ml clean beaker, adjust its pH to 9, heat to 90°C, stir, add 5.06g potassium carbonate, react for 30min, pH is 9.25, 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 (specific surface area 1500m 2 / g, the particle size is less than 50 μm), react for 60 min, settle and filter to obtain a low calcium vanadium solution with a calcium content below 0.005 g / 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 one or more of water-soluble carbonate and bicarbonate, the calcium separating agent is a substance which enables a 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 present invention relates to a method for reducing calcium ion concentration in a calcium-containing solution. Background technique [0002] Calcium is widely distributed in nature. Metallurgy, chemical industry, medicine, energy and environmental protection are all involved in calcium removal process. Especially with the development of denitration catalysts, the requirements for calcium content in ammonium metavanadate are getting higher and higher. The requirements of the method are also becoming more and more demanding. [0003] Usually, carbonates such as sodium carbonate are used to remove calcium in the calcium-containing solution. This method not only has poor effect, but also has disadvantages such as difficulty in sedimentation and easy filtration. [0004] Hou Xingang published in the Journal of Lanzhou University of Technology, "Reduction and deep purification of jarosite slag leaching solution", mentioned the use of ammonium fluoride p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/00C02F1/58C22B3/44C22B34/22
Inventor 殷兆迁李千文穆小玲孙朝晖伍珍秀欧涛
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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