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Process and system for improving operation period of vanadium pentoxide stripping and deamination tower,

A vanadium pentoxide, steam stripping and deamination technology, which is applied in the field of vanadium slag extraction wastewater treatment, can solve the problems affecting the continuous production and operation of vanadium pentoxide, non-continuous production of vanadium pentoxide, economic loss and environmental protection pressure, etc. To achieve the effect of improving the system operation cycle, ensuring the discharge of ammonia removal standards, and reasonable equipment structure

Active Publication Date: 2018-10-12
锦州钒业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the vanadium precipitation wastewater entering the stripping deamination tower contains harmful impurity ions such as silicon (0.3-0.9g / L), calcium (0.1-0.4g / L), during the steam stripping heating deamination process, the deamination tower gradually Scaling destroys the gas-liquid balance in the tower. The continuous operation period of the stripping deamination tower is generally less than 10 days. The deamination tower system is forced to stop for maintenance for more than a week to clean up the fouling, which seriously affects the continuous production and operation of vanadium pentoxide.
At present, domestic vanadium extraction enterprises usually use the method of adding high-efficiency scale inhibitors and dispersants to the vanadium precipitation wastewater to delay the scaling time, and the continuous operation period of the stripping deamination tower system has been improved, but the disadvantage of this method is that The operation period is relatively short, still less than 40 days, vanadium pentoxide cannot be produced continuously, and vanadium extraction enterprises often stop production and repair the stripping deamination tower, which often brings huge economic losses and environmental protection pressure

Method used

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  • Process and system for improving operation period of vanadium pentoxide stripping and deamination tower,

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] As shown in the figure, the acidic ammonium salt pretreatment system for improving the operation cycle of the vanadium pentoxide stripping and deamination tower has a first-level silicon removal tank 1, a second-level silicon removal tank 3, a first-level chromium and calcium removal tank 5, and a second-level silicon removal tank 5. The first-level decalcification tank 7, the liquid outlet of the first-level desiliconization tank 1 is communicated with the second-level desiliconization tank 3 through a pipeline, and the acidic ammonium salt vanadium precipitation wastewater inlet of the first-level desiliconization tank 1 is provided with an acidic ammonium salt The vanadium precipitation wastewater pipeline, the acidic ammonium salt vanadium precipitation wastewater inlet pipeline of the first-level silicon removal tank is provided with a valve a; the pipeline between the first-level silicon removal tank 1 and the second-level silicon removal tank 3 is sequentially equi...

Embodiment 2

[0037] The acidic ammonium salt pretreatment system for increasing the operating cycle of the vanadium pentoxide stripping deamination tower is the same as in Example 1.

[0038] The operation process of the vanadium pentoxide stripping deamination tower to increase the operating cycle process system is as follows: before the process system is started, all valves are closed;

[0039] (1) Open the valve a, send the acidic ammonium salt vanadium precipitation wastewater (silicon 0.7g / L, calcium 0.4g / L, hexavalent chromium 1.3g / L) at a temperature of 70°C into the primary silicon removal tank 1, and close the valve a, start the stirring paddle, add lime powder (particle size: 400 mesh, active CaO content 64%), control the pH value to 10.5, react for 30 minutes, carry out silicon removal once, analyze and detect the silicon content of the first-level silicon removal tank solution 0.06g / L, start the filter press pump I9, and pass the primary silicon removal solution through the fi...

Embodiment 3

[0044] The acidic ammonium salt pretreatment system for increasing the operating cycle of the vanadium pentoxide stripping deamination tower is the same as in Example 1.

[0045] The operation process of the vanadium pentoxide stripping deamination tower to increase the operating cycle process system is as follows: before the process system is started, all valves are closed;

[0046] (1) Open the valve a, send the acidic ammonium salt vanadium precipitation wastewater (silicon 0.3g / L, calcium 0.1g / L, hexavalent chromium 1.6g / L) at a temperature of 60°C into the primary silicon removal tank 1, and close the valve a, start the stirring paddle, add lime powder (particle size 350 mesh, active CaO content 76%), control the pH value to 9.8, react for 25 minutes, perform a silicon removal, analyze and detect that the silicon content of the first-level silicon removal tank solution is 0.06g / L, start Filter press pump I9, which separates the primary silicon removal solution through fil...

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PUM

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Abstract

The invention relates to a process and a system for improving the operation period of a vanadium pentoxide stripping and deamination tower. The process comprises the following steps: feeding acid ammonium-salt wastewater with sedimentated vanadium into a first-stage silicon-removing tank, adding a silicon-removing agent lime powder, carrying out primary silicon removal, carrying out solid-liquid separation by a filter press, feeding the treated wastewater into a second-stage silicon-removing tank, adding a silicon-removing agent calcium chloride, carrying out secondary silicon removal, carrying out solid-liquid separation through a microporous precision filter, feeding the separated wastewater into a first-stage chromium and calcium-removing tank, adding concentrated sulfuric acid, adjusting the pH value, adding a reducing agent sodium pyrosulfite for carrying out a react, then adding chromium and calcium removing agents which are sodium carbonate and sodium hydroxide, carrying out primary calcium removal, then carrying out solid-liquid separation through a filter press, feeding the treated wastewater into a second-stage calcium-removing tank, adding a calcium-removing agent sodiumphosphate, carrying out second-stage calcium removal, and carrying out solid-liquid separation through a microporous precision filter. The process has the advantages that through the selective removal of harmful ions such as silicon, calcium and the like, the operation period of the stripping and deamination tower system is increased by 4 times and reaches 150 days or more, the overhaul cleaningcost and the loss of production stop are reduced, the purpose of continuous production operation of vanadium pentoxide is realized, and the up-to-stand discharge in deamination of wastewater with sedimentated vanadium is ensured.

Description

technical field [0001] The invention belongs to the field of waste water treatment for vanadium slag extraction, and in particular relates to a process and a system for improving the operation period of a vanadium pentoxide stripping deammonization tower. Background technique [0002] Vanadium-titanium magnetite is smelted into vanadium-containing molten iron by blast furnace, oxidized and blown by converter, and vanadium enters the slag phase after enrichment to obtain vanadium slag. The process of extracting vanadium from vanadium slag is to roast the vanadium slag to clinker, leaching the clinker with water to obtain a vanadium solution, adding sulfuric acid and ammonium sulfate to the vanadium solution, steam heating and precipitating vanadium to prepare ammonium polyvanadate, and ammonium polyvanadate is dried in a melting furnace, Calcination decomposition, melting, cooling to produce flake vanadium pentoxide products. Due to the addition of excess ammonium sulfate to...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/22C02F101/10C02F103/16
CPCC02F1/001C02F1/04C02F1/20C02F1/58C02F1/60C02F1/62C02F1/66C02F9/00C02F2101/10C02F2101/22C02F2103/16C02F2301/08
Inventor 刘海田崔传海王刚庄立军杨锦铭孙丽月马锦红曹坤
Owner 锦州钒业有限责任公司
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