Desulfurization wastewater concentration, evaporation, crystallization and salt separation process

A technology for concentrating evaporation and desulfurization wastewater, which is applied in centrifugal separation of water/sewage treatment, alkali metal sulfite/sulfate purification, water pollutants, etc. Slow, high concentration of calcium and magnesium, to achieve the effect of not easy to block the pipe, improve efficiency and productivity, and high concentration of calcium and magnesium

Active Publication Date: 2016-10-12
SUZHOU JOYFA ENVIRONMENTAL TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When miscellaneous salts are evaporated, the concentration of calcium and magnesium is high, the flow rate in the tube is slow,

Method used

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  • Desulfurization wastewater concentration, evaporation, crystallization and salt separation process

Examples

Experimental program
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Effect test

Embodiment 1

[0035] refer to figure 1 As shown, this embodiment discloses a desulfurization wastewater concentration evaporation, crystallization, and salt separation process, including the following steps:

[0036] (1) The raw water enters the condensed water preheater through the feed pump, and is preheated to raise the temperature.

[0037] (2) After preheating and heating up, it enters the separator of the first-effect falling film evaporator, and the first-effect circulating pump sends the material in the first-effect separator to the top of the first-effect heater to form a film-like downward flow. Heat exchange outside the tube, evaporating water to increase the concentration.

[0038] (3) The material coming out of the one-effect falling film evaporator enters the four-effect forced circulation evaporator through the one-effect circulating pump, and in the separator of the four-effect forced circulation evaporator, the four-effect forced circulation evaporator The circulation pum...

Embodiment 2

[0050] In Example 2, taking the steps of Example 1 as an example, the desulfurization wastewater is divided into three stages, and sodium sulfate, sodium chloride and miscellaneous salts are separated respectively.

[0051] 1. 80m 3 / hr sodium sulfate evaporation process

[0052] (1) Materials:

[0053] The raw water enters the condensate water preheater through the feed pump, and enters the first-effect separator after preheating. exchange to achieve the purpose of evaporating part of the water and increasing the concentration.

[0054] The four-effect material is transferred to the separator through the one-effect circulation pump, and the material is conveyed by the forced circulation pump to exchange heat through the heat exchanger to achieve the purpose of evaporating part of the water and increasing the concentration.

[0055] The three-effect material is pumped into the three-effect separator through the four-effect material transfer pump, and the material is conveye...

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Abstract

The invention discloses a desulfurization wastewater concentration, evaporation, crystallization, and salt separation process. The process comprises the steps as follows: introducing raw water into a quadruple-effect counter-flow forced circulation evaporator, treating sodium sulfate through evaporating, concentrating and crystalizing, separating sodium sulfate first, and freezing separated mother liquor, wherein most of sodium sulfate in the mother liquor is successfully separated; introducing the frozen mother liquor into a triple-effect evaporator after preheating, evaporating, concentrating and crystalizing sodium chloride, wherein the obtained crystal salt is used as an industrial raw material; introducing the mother liquor produced by a sodium chloride evaporator into a single-effect evaporator to obtain an abraum salt crystal. The process successfully separates the sodium sulfate in the desulfurization wastewater, and the sodium chloride is treated through evaporating, concentrating and crystalizing, the obtained sodium chloride crystal salt is used as the industrial raw material, the mother liquor produced by the sodium chloride evaporator enters the single-effect evaporator to obtain the abraum salt crystal, so that the sodium sulfate and the sodium chloride are effectively separated.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater recovery, in particular to a desulfurization wastewater concentration evaporation, crystallization and salt separation process. Background technique [0002] Evaporation and crystallization equipment is a large-scale evaporation (concentration) crystallization equipment for wastewater treatment and comprehensive utilization in chemical industry, metal smelting industry, food industry, pharmaceutical industry, feed fermentation industry, ammonium desulfurization of steel plants and power plants, oil and gas fields, etc. , Up-to-standard emissions have risen to environmental protection treatment plus comprehensive utilization. Recycling ammonium chloride, potassium chloride, ammonium sulfate, potassium sulfate, etc. in wastewater to make compound fertilizers; recycling aluminum chloride, zinc chloride, ferrous chloride, manganese sulfate, nickel sulfate and other precious metals i...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D5/16C01D3/14
CPCC01D3/14C01D5/16C02F1/048C02F1/22C02F1/38C02F9/00C02F2101/101C02F2101/12C02F2301/08
Inventor 丁治椿
Owner SUZHOU JOYFA ENVIRONMENTAL TECH CORP LTD
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