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Method for preparing thiocyanate and sulfate by utilizing desulfuration waste liquor in coking plant

A technology for thiocyanate and desulfurization waste liquid, which is applied in the field of preparation of thiocyanate and sulfate, can solve the problems such as difficulty in improving product quality, and achieve the effect of less consumption, less solute loss, and realization of recycling

Active Publication Date: 2012-07-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the shortcoming that existing desulfurization waste liquid produces thiocyanate, the technical existence of sulfate that the product quality is difficult to improve, and remaining waste water needs to be further processed; - In the future, the decolorization of activated carbon will be carried out, and the method of preparing high-purity thiocyanate and sulfate by using the desulfurization waste liquid of the coking plant will achieve less consumption of activated carbon and less loss of solute, and due to SCN - Pre-separated from other ions, adding an oxidation step to oxidize impurity ions into products, the obtained thiocyanate and sulfate are of high purity, and there is no external waste water

Method used

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  • Method for preparing thiocyanate and sulfate by utilizing desulfuration waste liquor in coking plant
  • Method for preparing thiocyanate and sulfate by utilizing desulfuration waste liquor in coking plant

Examples

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Effect test

Embodiment 1

[0029] Refer to attached figure 1 , present embodiment is the method for preparing sodium thiocyanate and ammonium sulfate with the desulfurization waste liquid that HPF method desulfurization effluxes, and concrete process is as follows:

[0030] 1. Pour the desulfurization waste liquid discharged from HPF desulfurization into the precipitation reactor, take the copper sulfate solid, prepare a saturated copper sulfate solution at 80 ° C, and carry out the batching according to the volume ratio of the saturated copper sulfate solution to the desulfurization waste liquid of 1:2, and put Add the prepared saturated copper sulfate solution into the precipitation reactor and mix with the desulfurization waste liquid, mix and stir, keep the reaction temperature at 80°C, and stir for 45 minutes to obtain a slurry containing cuprous thiocyanate and having a pH of 0-3;

[0031] 2. Using a plate and frame filter or a centrifuge, the slurry obtained in step 1 containing cuprous thiocyana...

Embodiment 2

[0055] Present embodiment is the method for preparing ammonium thiocyanate and ammonium sulfate with the desulfurization waste liquid that PDS method desulfurization effluxes, and process is similar to embodiment 1, and concrete process is as follows:

[0056] Take copper sulfate pentahydrate solid, prepare saturated solution of copper sulfate at 95°C, mix according to the volume ratio of saturated copper sulfate solution and desulfurization waste liquid at 1:1, stir, keep the reaction temperature at 95°C, and stir for 10 minutes; then use a centrifuge Carry out solid-liquid separation to obtain cuprous thiocyanate solid and remaining waste liquid.

[0057] Discharge the remaining waste liquid into the decolorization oxidation reactor, add granular activated carbon at the rate of 1 kg of activated carbon / ton of the remaining waste liquid, use ammonia water to adjust the pH to 5, and carry out oxygen aeration for 360 minutes. Then a plate and frame filter is used for solid-liqu...

Embodiment 3

[0060] The present embodiment is the method for preparing potassium thiocyanate and sodium sulfate with the desulfurization waste liquid discharged from the desulfurization of the improved ADA method, similar to embodiment 1, and the specific process is as follows:

[0061] Prepare saturated copper sulfate solution at 50°C, mix according to the volume ratio of saturated copper sulfate solution and desulfurization waste liquid at 1:2.5, stir, keep the reaction temperature at 40°C, and stir for 80 minutes; then use a plate and frame filter for solid-liquid separation, Obtain cuprous thiocyanate solid and remaining waste liquid.

[0062] Discharge the remaining waste liquid into the decolorization oxidation reactor, add powdered activated carbon at the rate of 50kg activated carbon per ton of the remaining waste liquid, use sodium hydroxide liquid caustic soda to adjust the pH to 7, and carry out ozone aeration for 10 minutes. Then a centrifuge is used for solid-liquid separation...

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Abstract

The invention relates to a method for preparing thiocyanate and sulfate by utilizing desulfuration waste liquor in a coking plant, which comprises the following steps of: preparing saturated solution of copper sulfate, mixing the saturated solution with desulfuration waste liquor, and heating and stirring; performing solid-liquid separation to obtain a solid and sulfate liquid; adding aqueous alkali into the solid, heating at the temperature of between 50 and 98 DEG C, and stirring and reacting for 10 to 120 minutes; performing solid-liquid separation on slurry obtained by heating; concentrating the obtained liquid, and freezing for crystallizing and drying to obtain a high-purity thiocyanate product; calcining the obtained solid, adding solution of sulfuric acid, and stirring to produce the copper sulfate for circular use; adding activated carbon into the sulfate liquid, and aerating and oxidizing to purify sulfate; and concentrating the sulfate, and crystallizing and drying to obtain a high-purity sulfate product. The method solves the problem of pollution of the desulfuration waste liquor to the environment, and simultaneously, pollutants can become value products through the production of the high-purity thiocyanate product and the high-purity sulfate product.

Description

field of invention [0001] The invention relates to a process method for reusing desulfurization waste liquid in a coking plant, in particular to a method for preparing thiocyanate and sulfate from waste liquid containing high-concentration sulfur-containing anions. Background technique [0002] Desulfurization waste liquid is commonly used in coke oven gas desulfurization process, such as HPF method, PDS method, improved ADA method, etc., all of which have desulfurization waste liquid discharged. [0003] Desulfurization waste liquid contains a lot of SO 4 2- , SO 3 2- , S 2 o 3 2- 、SCN - And other substances, large-scale coking plants need to discharge more than 100 tons every day, if discharged directly, it will cause serious environmental pollution. Due to the high salt concentration, the desulfurization waste liquid should not be directly treated by biological methods. Therefore, recycling the valuable components is the preferred method to deal with desulfurizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/20C01B17/96C01C1/22C01D5/00
Inventor 刘晨明曹宏斌李玉平张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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