Sodium sulfate and ammonium sulfate salt mixture separation method and vanadium precipitation waste treatment method

A separation method, sodium sulfate technology, applied in the direction of alkali metal sulfite/sulfite, ammonium sulfate, chemical instruments and methods, etc., can solve the problems of environmental pollution, poly-sodium hydroxide impurities, high equipment cost, etc.

Inactive Publication Date: 2019-01-01
李月波 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are more sodium hydroxide impurities in the sodium sulfate crystals recovered in this way, ...

Method used

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  • Sodium sulfate and ammonium sulfate salt mixture separation method and vanadium precipitation waste treatment method
  • Sodium sulfate and ammonium sulfate salt mixture separation method and vanadium precipitation waste treatment method
  • Sodium sulfate and ammonium sulfate salt mixture separation method and vanadium precipitation waste treatment method

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Embodiment 1

[0061] Please refer to figure 2 , This embodiment provides a method for separating mixed salts of sodium sulfate and ammonium sulfate.

[0062] Before understanding the process of this embodiment, please refer to figure 1 Solubility curves for sodium sulfate and ammonium sulfate are shown, from figure 1 It can be seen that at 40°C, the solubility difference of sodium sulfate and ammonium sulfate is the smallest, which are 488g / L and 812g / L, respectively. and The ratio of 0.61, if the concentration of sodium sulfate in the mixed salt solution C Na2SO4 and the concentration of ammonium sulfate C (NH4)2SO4 If the ratio is greater than 0.61, then in the process of evaporating and concentrating the mixed salt solution, sodium sulfate always reaches supersaturation first and precipitates before ammonium sulfate. The mixed salt solution that meets this concentration requirement can directly separate part of the sulfuric acid through cooling and crystallization. sodium. And a...

Embodiment 2

[0092] The present embodiment provides a kind of processing method of processing vanadium precipitation waste, specifically comprises the following steps:

[0093] Step 1. Removal of mechanical impurities: dissolving and filtering the vanadium-precipitated waste residue to remove mechanical impurities to obtain a mixed salt solution; or filtering the vanadium-precipitated waste water to remove mechanical impurities to obtain a mixed salt solution;

[0094] Step 2, recovery of sodium sulfate: heating and evaporating the mixed salt solution in the temperature range of 80°C-100°C until the sodium sulfate is in a supersaturated state, and the concentration of ammonium sulfate is close to but lower than the temperature T 1 When the solubility of ammonium sulfate; then the solution is cooled to temperature T 1 Filtrate to obtain solid sodium sulfate and filtrate, solid sodium sulfate is recovered, and the filtrate is subjected to step three operations;

[0095] Step 3. Cooling: Coo...

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Abstract

The invention belongs to the technical field of a chemical process and discloses a treatment method for vanadium precipitation wastes. The treatment method comprises: S1: removing mechanical impurities; S2: recovering sodium sulfate; S3: cooling to separate out complex salt; S4: recovering ammonium sulfate, wherein the complex salt obtained by cooling in the step S3 can be reused for the step S2 to carry out recovery of sodium sulfate, and filtrate obtained in the step S4 can be used for the step S2 to carry out recovery of sodium sulfate after being subjected to processing in the step S3 of cooling to separate out the complex salt, so as to form a closed cycle. Compared to the prior art, yield and quality of sodium sulfate and ammonium sulfate are improved, waste discharge is reduced, andthe method has great economic significance and environment-friendly significance.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for separating mixed salts of sodium sulfate and ammonium sulfate and a method for treating vanadium precipitation waste. Background technique [0002] In the existing production process of vanadium products, every ton of V produced 2 o 5 or V 2 o 3 , will generate 50-70m 3 The vanadium precipitation wastewater, the daily output of vanadium precipitation wastewater of large vanadium product enterprises even reaches 200-300 tons. Vanadium precipitation wastewater contains a large amount of sodium sulfate and ammonium sulfate, if discharged directly, it will seriously pollute the environment. At present, almost all vanadium-making enterprises concentrate and crystallize the waste water into a mixture of sodium sulfate decahydrate and ammonium sulfate as general industrial waste, or use coal as a reducing agent to produce sodium sulfide from the i...

Claims

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Application Information

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IPC IPC(8): C01C1/24C01D5/00
CPCC01C1/24C01D5/00C01P2006/80
Inventor 李月波
Owner 李月波
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