Technique for simple substance salt separation with co-production of sodium sulfide from high-salinity wastewater

A technology of high-salt wastewater and process method, which is applied in alkali metal sulfide/polysulfide, alkali metal sulfite/sulfate purification, alkali metal halide purification, etc. Profits, the realization of resource utilization, the effect of simple and stable process conditions

Inactive Publication Date: 2015-12-16
SHIJIAZHUANG GONGDA CHEM EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mixed salt of these two salts is very difficult to handle, and these two...

Method used

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  • Technique for simple substance salt separation with co-production of sodium sulfide from high-salinity wastewater
  • Technique for simple substance salt separation with co-production of sodium sulfide from high-salinity wastewater

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Embodiment 1

[0065] This embodiment is a process for separating the elemental salts of high-salt wastewater containing sodium sulfate and sodium chloride and co-producing soda sulfide. The process flow is as follows figure 2 shown.

[0066] In this embodiment, the primary evaporation and crystallization adopts a double-effect downstream process, and the first-effect evaporator adopts a falling film evaporator, including a first-effect evaporator and a second-effect evaporation crystallizer; the first-effect evaporator includes a first-effect separation chamber 2 and a first-effect evaporator. The heating chamber 1; the second-effect evaporation crystallizer adopts a forced circulation evaporation crystallizer, and the second-effect evaporation crystallizer includes a second-effect crystallization separator 4 and a second-effect heating chamber 3 . Sedimentation tank 6 is used for chemical precipitation. The secondary evaporation crystallizer adopts a single-effect forced circulation evap...

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Abstract

The invention discloses a technique for simple substance salt separation with co-production of sodium sulfide from high-salinity wastewater containing sodium sulfate and sodium chloride and belongs to the field of sewage treatment. The technique comprises the following steps: producing sodium sulfate with a primary evaporative crystallization method, removing SO4<2-> from the high-salinity wastewater with a chemical precipitation method, producing sodium chloride with a secondary evaporative crystallization method and producing sodium sulfide from final mother liquor with a cooling method. The whole treatment process is required to be controlled under a slightly alkaline condition. According to the technique, sodium sulfate and sodium chloride in the high-salinity wastewater can be recycled effectively, residual mother liquor can be used for producing sodium sulfide, most impurities can be removed, zero emission can be realized, the environmental protection pressure and the wastewater treatment cost are reduced greatly, and new economic benefit points can be created.

Description

technical field [0001] The invention relates to a method for co-producing soda sulfide in the recovery and treatment process of high-salt wastewater, which belongs to the field of sewage treatment. Background technique [0002] High-salt wastewater refers to wastewater with a mass content of total dissolved solids and organic matter greater than or equal to 3.5%, including high-salt domestic wastewater and high-salt industrial wastewater. The main sources of high-salt wastewater are industrial production and domestic sewage that directly use seawater, as well as sewage produced by food processing factories, pharmaceutical factories, chemical factories, petroleum collection and processing industries, and natural gas collection and processing industries. The wastewater obtained after biochemical treatment of these sewage is high-salt wastewater. In addition to organic pollutants, high-salt wastewater also contains a large amount of inorganic salts, such as Cl － , SO 4 2－ 、N...

Claims

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Application Information

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IPC IPC(8): C01D3/14C01D5/16C01F11/46C01B17/22
Inventor 张继军
Owner SHIJIAZHUANG GONGDA CHEM EQUIP
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