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Method of continuously removing chloride ions from circulating water for water-quenched slag at low cost

A technology for circulating water and removing water, which is applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc. It can solve the problems of high cost and affecting continuous dechlorination, and achieves a simple method and high efficiency and continuity, the effect of reducing the content of chloride ions

Inactive Publication Date: 2019-07-12
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of the high cost of the above-mentioned method for removing chloride ions and the failure of the pH of the treated water to affect continuous chlorine removal, the present invention provides a method for continuously removing chloride ions in circulating water for water quenching slag. Renewable resources, the aluminum content in waterworks sludge is high, the cost of recycling a ton of aluminum hydroxide is about 1,500 yuan, and the cost of purchasing a ton of aluminum hydroxide is about 2,500 yuan, which solves the problem of high raw material costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Recover the aluminum in the sludge of the waterworks as the aluminum source. First, the sludge is dissolved in sulfuric acid with a concentration of 1mol / L, and the pH of the acid solution is controlled at 3.5. The reaction time is 20 minutes; Under the condition that the solution volume ratio is 1:1, carry out three-stage extraction; Then with the sulfuric acid of 5mol / L O :V A ) is carried out under the condition of 5:1 for three-stage stripping; the stripping solution is adjusted to pH 6 with ammonia water, filtered and precipitated to obtain aluminum hydroxide as the aluminum source, and calcium oxide as the calcium source;

[0036] Step 2: The measured chlorine ion concentration in the circulating water for water quenching slag is 5036mg / L, take 1L of circulating water in a beaker, calculate the total amount of chlorine ions in the water according to the chloride ion concentration value, and the molar ratio of the dosage of the medicament to the chloride io...

Embodiment 2

[0040]Step 1: Recover the aluminum in the sludge of the waterworks as the aluminum source. First, the sludge is acid-dissolved with sulfuric acid with a concentration of 3mol / L, and the pH of the acid solution is controlled at 1, and the reaction time is 1h; Under the condition that the solution volume ratio is 1:3, three-stage extraction is carried out; O :V A ) under the condition of 3:1 to carry out three-stage stripping; the stripping solution uses ammonia water to adjust the pH to 7, filter the precipitate to prepare aluminum hydroxide as the aluminum source, and calcium oxide as the calcium source;

[0041] Step 2: The measured chlorine ion concentration in the circulating water for water-quenched slag is 5036mg / L. Take 1L of circulating water in a beaker. Calculate the total amount of chloride ions in the water according to the concentration of chloride ions, and the molar ratio of the dosage of the agent to the chloride ions is Ca 2+ :Al 3+ : CI - =5:2:1;

[0042]...

Embodiment 3

[0045] Step 1: reclaim the aluminum in the sludge of the waterworks as the aluminum source, first pass the sludge through the sulfuric acid acid solution with a concentration of 2mol / L, control the pH of the acid solution at 2.5, and the reaction time is 40min; the eluate is in the P204-kerosene extractant Under the condition that the volume ratio of the solution to the solution is 1:2, the three-stage extraction is carried out; O :V A ) under the condition of 4:1 to carry out three-stage stripping; the stripping liquid uses ammonia water to adjust the pH to 8, filter the precipitate to prepare aluminum hydroxide as the aluminum source, and use calcium oxide as the calcium source;

[0046] Step 2: The measured chlorine ion concentration in the circulating water for water-quenched slag is 5036mg / L. Take 1L of circulating water in a beaker. Calculate the total amount of chloride ions in the water according to the concentration of chloride ions, and the molar ratio of the dosage...

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Abstract

The invention relates to the field of sewage treatment, in particular to a method of continuously removing chloride ions from circulating water for water-quenched slag at low cost. The method comprises the steps of: step 1: recovering aluminum from waterworks sludge for treatment to prepare aluminum hydroxide as an aluminum source, and taking calcium oxide or calcium hydroxide as a calcium source,step 2: calculating a total amount of chloride ions in the water and dosage of calcium and aluminum agents according to a measured chloride ion concentration of the circulating water for the water-quenched slag, step 3: adding the agents into the circulating water for the water-quenched slag, performing stirring for reaction, standing and filtration, and detecting a chloride ion content in the circulating water after the filtration, step 4: feeding carbon dioxide to regulate a pH (potential of hydrogen) of the circulating water to be less than 8.5. The treated circulating water can be used for secondary dechloridation or dechloridation for many times; conditions are completely referred to the above steps; after the continuous dechloridation, water quality reaches the standard; and the circulating water can be used for circular water quenching. The method makes full use of renewable resources and is energy-saving, environmentally friendly and high in treatment efficiency, and the agents are cheap and easy to obtain.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a low-cost method for continuously removing chloride ions in circulating water for water-quenched slag. Background technique [0002] The water quenching process is a waste slag treatment process widely used in the metallurgical industry. Due to the large amount of water and supplementary water in the water quenching process, the water for the water quenching process is recycled for a long time, and the chloride ions brought in by the waste slag and supplementary water will be enriched in the circulation system. After reaching a certain concentration, it corrodes the pipeline and adheres to the surface of water-quenched slag, affecting the quality of water-quenched slag. How to remove chloride ions in circulating water for water quenching slag has become a problem to be solved urgently. [0003] At present, the chloride ion removal technologies used in industrial wastewater mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/66C02F101/12C02F103/16
CPCC02F1/58C02F1/66C02F2101/12C02F2103/16
Inventor 刘晨裴晓东骆艳华佘世杰钱有军李涛李晓祥张倩倩
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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