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Recycling method of potassium sulfate waste water

A waste water recovery and potassium sulfate technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, water pollutants, etc., can solve the problems of secondary pollution and high cost of potassium sulfate waste liquid, and achieve the effect of low cost

Inactive Publication Date: 2019-05-28
王娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for recycling potassium sulfate waste water, which solves the problem of high cost and secondary pollution in the prior art for treating potassium sulfate waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Take 500L of potassium sulfate-containing wastewater (potassium sulfate concentration is about 120g / L) from a factory, pretreat it through a filter, remove suspended impurities in the wastewater, add 0.5kg of surfactant, start stirring, and heat up to 60°C And keep it constant, slowly add 100kg of barium carbonate (60min to finish adding), open the circulation pump and water mill at the same time, add and then react for 120min. After centrifugation, the filter cake was added to an acid washing tank equipped with 500 L of sulfuric acid with a concentration of 3 mol / L, the temperature of the system was controlled at 45 ° C, and the reaction was stirred for 60 min. After filtering, the filter cake was dried and sieved to obtain 112kg of barium sulfate. The centrifuged filtrate was evaporated, crystallized and dried to obtain 38 kg of potassium carbonate.

Embodiment 2

[0033] Example 2: Get 1000L of potassium sulfate-containing wastewater (potassium sulfate concentration is about 100g / L) from a factory, pretreat it through a filter, remove suspended impurities in the wastewater, add 1kg of surfactant, start stirring, heat up to 80°C and Keep it constant, slowly add 166 kg of barium carbonate (60 minutes to complete the addition), and simultaneously open the circulation pump and water mill, and then react for 100 minutes after the addition is completed. After centrifugation, the filter cake was added to an acid washing tank equipped with 1000L of sulfuric acid with a concentration of 2.5mol / L, the temperature of the system was controlled at 45°C, and the reaction was stirred for 60min. Filter, filter cake obtains barium sulfate 186kg through drying, sieving. The centrifuged filtrate was evaporated, crystallized and dried to obtain 63 kg of potassium carbonate.

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PUM

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Abstract

The invention discloses a recycling method of potassium sulfate waste water. The recycling method comprises the following steps: removing mechanical impurities from potassium sulfate waste liquid; adding a surfactant into the potassium sulfate waste liquid, starting stirring, rising the temperature to 40-80 DEG C, then slowly adding barium carbonate, starting a circulating pump at the same time, conveying reaction liquid to a water grinder and grinding generated barium sulfate particles, and then circulating into a reactor, wherein the circulating amount per hour is the volume of the reactionliquid; performing centrifugal separation on the reaction liquid by a centrifugal machine to realize solid-liquid separation so as to respectively obtain coarse barium sulfate particles and a potassium carbonate solution; filtering the coarse barium sulfate particles by a plate and frame filter press, washing filtering cakes with clean water till washing water is close to be neutral, drying and sieving by a 300-mesh sieve to obtain a barium sulfate product; and evaporating the potassium carbonate solution by a triple-effect vacuum evaporator till the concentration of potassium carbonate is 300-500 g / L, cooling, crystallizing, performing centrifugal separation and drying to obtain a potassium carbonate product. The recycling method disclosed by the invention has the beneficial effects thatthe cost for treating the potassium sulfate waste liquid is low and no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of potassium carbonate preparation and relates to a method for recycling potassium sulfate wastewater. Background technique [0002] Potassium sulfate wastewater is a kind of wastewater that is common in industrial production and has a large amount of production. The main sources include the process of extracting phenol from coal tar, hydrometallurgy industry, electroplating industry and other industries (such as nickel hydroxide production), etc. If If it is discharged directly, potassium sulfate will seep into the ground and accumulate for a long time, which will cause salinization of the land and gradually increase the content of sulfate ions in the groundwater source. Therefore, this wastewater containing potassium sulfate cannot be discharged directly. At present, there are several main treatment methods for wastewater containing potassium sulfate: [0003] (1) Nanofiltration-reverse osmosis membrane m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F11/46C01D7/02C02F101/10
Inventor 王娟
Owner 王娟