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Comprehensive utilization method of desulfurization waste liquid

A technology for desulfurization waste liquid and waste liquid, which is applied in chemical instruments and methods, thiocyanic acid, flocculation/sedimentation water/sewage treatment, etc., can solve energy consumption or complex operation, cumbersome follow-up step recycling, and is not suitable for industrial applications and other problems, to achieve the effect of reducing salt concentration and reducing efflux

Inactive Publication Date: 2011-10-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the concentration and extraction methods are either energy-intensive or complicated to operate, and are not suitable for industrial applications
The patent application CN200910090152.4 discloses that adding copper sulfate to the desulfurization waste liquid can form a precipitate to reduce the salt concentration in the waste liquid. However, this method designs cumbersome follow-up steps to realize the recycling of copper sulfate, and does not achieve economical and effective treatment. Effect

Method used

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  • Comprehensive utilization method of desulfurization waste liquid
  • Comprehensive utilization method of desulfurization waste liquid
  • Comprehensive utilization method of desulfurization waste liquid

Examples

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Effect test

Embodiment 1

[0020] Laboratory preparation containing NaSCN and Na 2 S 2 o 3 Simulated desulfurization waste liquid, which contains NaSCN 100g / L, Na 2 S 2 o 3 100g / L, Na 2 CO 3 2g / L, NaHCO 3 It is 20g / L, and the pH is 8.58. Take 100ml of the solution to react, the reaction temperature is normal temperature, add CuSO of different quality in small amounts and several times under the condition of stirring 4 ×5H 2 O, after separating the precipitate, measure the pH value and SCN of the solution after the reaction - , S 2 o 3 - 2- , SO 4 2- 、Cu 2+ The concentration and the amount and phase composition of the precipitate. The determination methods refer to national standards, and the results are shown in Table 1.

[0021] Table 1 Addition of CuSO to simulated desulfurization waste liquid 4 ·5H 2 O and its purification effect

[0022] (Composition of simulated desulfurization waste liquid: NaSCN 100g / L, Na 2 S 2 o 3 100g / L, Na 2 CO3 2g / L, NaHCO 3 20g / L, pH 8.58)

[0...

Embodiment 2

[0026] Laboratory preparation containing NaSCN, Na 2 S 2 o 3 and Na 2 SO 4 Simulated desulfurization waste liquid, which contains NaSCN 100g / L, Na 2 SO 4 40g / L, Na 2 S 2 o 3 100g / L, Na 2 CO 3 2g / L, NaHCO 3 It is 20g / L, and the pH is 8.58. Take 100ml of the solution to react, the reaction temperature is normal temperature, add CuSO of different quality in small amounts and several times under the condition of stirring 4 ×5H 2 O, after separating the precipitate, measure the pH value and SCN of the solution after the reaction - , S 2 o 3 - 2- , SO 4 2- 、Cu 2+ The concentration and the amount and phase composition of the precipitate. The determination methods refer to national standards, and the results are shown in Table 2.

[0027] Table 2 Adding CuSO to simulated desulfurization waste liquid 4 ·5H 2 O and its purification effect

[0028] (Composition of simulated desulfurization waste liquid: NaSCN 100g / L, Na 2 SO 4 40g / L, Na 2 S 2 o 3 100g / L,...

Embodiment 3

[0033] The actual desulfurization waste liquid was determined from a fertilizer factory, and the composition of the tested solution was: NaSCN 125g / L, NaSCN 2 S 2 o 3 83.8g / L, Na 2 SO 4 43g / L, Na 2 CO 3 2.18g / L, NaHCO 3 21.9g / L, pH 8.46. Take 100ml solution to react, the reaction temperature is normal temperature, by adding different quality CuSO 4 ·5H 2 O, after separating the precipitate, measure the pH value and SCN of the solution after the reaction - , S 2 o 3 - 2- , SO 4 2- 、Cu 2+ The concentration and the amount and phase composition of the precipitate. The determination methods refer to national standards, and the results are shown in Table 3.

[0034] Table 3 CuSO was added to the actual desulfurization waste liquid of a fertilizer plant 4 ·5H 2 O and its purification effect

[0035] (The actual desulfurization waste liquid composition of a chemical fertilizer plant: NaSCN 125g / L, Na 2 SO 4 43g / L, Na 2 S 2 o 3 83.3g / L, Na 2 CO 3 2.18g / ...

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Abstract

The desulfurization waste liquid of a sodium carbonate-sodium bicarbonate solution which contains high concentrations of sodium thiosulfate, sodium thiocyanide and sodium sulfate loses the absorption capability to hydrogen sulfide, and can not be directly discharged, thus a difficult problem emerges. The invention provides a treatment method for recycling the desulfurization waste liquid which is characterized by comprising the following steps of: adding an appropriate amount of copper sulfate to the desulfurization waste liquid to form high-purity cuprous thiocyanate precipitate; separating the precipitate, wherein the concentrations of sodium thiosulfate and sodium thiocyanate in the water body are significantly reduced and part of sodium thiosulfate and sodium thiocyanate is converted into sodium sulfate, so that sodium sulfate in the water body is saturated; and then removing the majority of sodium sulfate by using low-temperature crystallization or other industrially realizable methods to greatly reduce the salt concentration of the water body, wherein the water body can be used as desulfurization liquid after the supplementation of sodium carbonate, thus avoiding or reducing discharge.

Description

technical field [0001] The invention relates to a treatment method for sodium carbonate solution desulfurization waste liquid, which is characterized in that high-purity cuprous thiocyanate can be obtained by adding an appropriate amount of copper sulfate to the waste liquid, and the filtrate can be used as a replacement liquid for the absorption of hydrogen sulfide . Background technique [0002] Some domestic fertilizer plants and coking plants use a mixed solution of sodium carbonate-sodium bicarbonate (sodium lye) with a pH value of 8.5-8.7 as the absorption liquid to absorb H in the production tail gas in the desulfurization tower. 2 S. Thereafter, the S in the absorption solution 2- It is oxidized to elemental sulfur under the action of a catalyst, and after filtering and separating elemental sulfur, the absorption liquid can be recycled for H 2 S uptake. However, in addition to elemental sulfur, there are a small amount of other oxidation products in the catalytic...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/58C01C3/20
Inventor 陈咏梅陈聪万平玉杨晓进
Owner BEIJING UNIV OF CHEM TECH
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