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Total-sealed harmless treatment method for phosphate-fertilizer-enterprise hydrofluosilicic acid wastewater

A technology of harmless treatment and treatment method, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. The effect of large market demand, excellent product performance and low production cost

Active Publication Date: 2017-01-04
云南凯威特新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium sulfate or sodium chloride is used as a raw material, and the reaction mother liquid is dilute sulfuric acid and silica gel solution with a content of 2-5%, which is difficult to handle and utilize; with sodium fluoride as a raw material, the reaction mother liquid is dilute hydrochloric acid with a content of 2-5% and Silica gel solution will corrode phosphate fertilizer production equipment and basically cannot be recycled
Moreover, producing one ton of sodium fluorosilicate will produce 12-15 tons of waste water containing silica gel, dilute sulfuric acid, and dilute hydrochloric acid at the same time. These waste waters cannot be discharged directly and must be treated. The waste water treatment costs are high. It is difficult to discharge solid waste and waste water up to standard
[0005] 2. The market capacity of fluorine-salt industrial products is limited, the users are scattered, and the current production capacity is seriously overcapacitated. Phosphate fertilizer manufacturers regard fluorosilicate as a burden, and under the pressure of environmental protection and survival, they convert the fluorine-containing waste gas generated in the production process into low-efficiency Concentrated fluorosilicic acid is used again for the neutralization reaction of raw materials, and most of the fluorine is taken away with the phosphate fertilizer, resulting in an increase in the fluorine content of the phosphate fertilizer

Method used

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  • Total-sealed harmless treatment method for phosphate-fertilizer-enterprise hydrofluosilicic acid wastewater
  • Total-sealed harmless treatment method for phosphate-fertilizer-enterprise hydrofluosilicic acid wastewater
  • Total-sealed harmless treatment method for phosphate-fertilizer-enterprise hydrofluosilicic acid wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment one: a set of fully enclosed treatment system is installed in the phosphate fertilizer enterprise, namely reactor 1 and drying tower 2 are set, and the reactor 1 is communicated with by liquid pump 3 between the existing fluosilicic acid liquid storage tank 4 of the phosphate fertilizer enterprise, The bottom of the reaction kettle is communicated with the top of the drying tower 2 through a syringe pump 5, the lower end of the drying tower is provided with a discharge port 6, and the top is equipped with a dry tail gas pipe 7 to communicate with the fluorine waste gas circulation absorption system of the phosphate fertilizer enterprise;

[0045] 1. Requirements for raw materials:

[0046] (1) Fluorosilicic acid 120 kg Phosphate fertilizer enterprises collect fluosilicic acid according to conventional methods, concentrate it to a content of 12% (usually contains 3-6% silica gel, no need to use any method to remove silica gel, just use it directly) and store in...

Embodiment 2

[0059] 1. Requirements for raw materials:

[0060] (1) Fluorosilicic acid 120 kg content 10%,

[0061] (2) Aluminum hydroxide 16 kg meets the requirements of GB / T4294-2010,

[0062] (3) 19 kg of sulfuric acid with a content of 98%,

[0063] (4) Magnesium oxide 17kg content 95%;

[0064] 2. Harmless treatment process

[0065] (1) Mix 16 kg of aluminum hydroxide with water at a weight ratio of 1:1 to form a slurry, and add it to the reaction kettle;

[0066] (2) Start the agitator of the reactor, control the speed at 120-140 rpm, slowly add 19kg of sulfuric acid, and control the feeding time at 15-20 minutes;

[0067] (3) After adding sulfuric acid, quickly add 120kg of fluosilicic acid stored in the fluosilicic acid reservoir 4 through the liquid pump 3 into the reaction kettle, heat to 95-100°C and react at a constant temperature for 90-100 minutes. Obtain reaction solution A;

[0068] (4) Mix 17kg of magnesia with water to make a slurry at a weight ratio of 1:1, slowly ...

Embodiment 3

[0073] 1. Requirements for raw materials:

[0074] (1) Fluorosilicic acid 120 kg content 15%,

[0075] (2) Aluminum hydroxide 17.5 kg meets the requirements of GB / T4294-2010,

[0076] (3) 19.5 kg of sulfuric acid with a content of 98%,

[0077] (4) Magnesium oxide 17kg content 95%;

[0078] The rest of this embodiment are the same as the first embodiment.

[0079] Embodiment one, embodiment two, embodiment three are carried out the gained product (solid powder) after detoxification treatment and carry out component detection and analysis, and the results are shown in Table 3:

[0080] Table 3: Content table of harmless solid substances

[0081]

[0082] The above ingredients together form the product obtained after harmless treatment. The product is a solid powder, non-toxic and harmless, and easy to transport. It can be used to process and produce concrete quick-setting agent, concrete early-strength agent, reinforcing agent and other substances.

[0083] The present ...

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Abstract

The invention discloses a total-sealed harmless treatment method for phosphate-fertilizer-enterprise hydrofluosilicic acid wastewater. The treatment method includes the steps that 120 parts of hydrofluosilicic acid with the content of 10% to 15%, 15.5-17.5 parts of calmogastrin, 19-20 parts of sulphuric acid with the content larger than or equal to 98% and 17-19 parts of magnesium oxide with the content larger than or equal to 95% are reacted in the total-sealed environment to generate harmless solid substances. By means of the treating method, the discharging problem of phosphate-fertilizer-enterprise harmful gas is solved, and harmful gas is effectively and fully recycled; as total-sealed treatment is carried out, materials do not fall down, waste gas, waste water and industrial residue in the whole process are avoided, the environment is protected, and the operating cost of an enterprise is greatly reduced, and the total-sealed harmless treatment method is of great significance in promoting sustainable development and cleaning production of a phosphate fertilizer enterprise.

Description

technical field [0001] The invention relates to a treatment method of fluosilicic acid wastewater, in particular to a fully enclosed and harmless treatment method of fluosilicic acid wastewater in a phosphate fertilizer enterprise. Background technique [0002] In the process of phosphate fertilizer production, a large amount of fluorine-containing waste gas will be discharged, the amount is huge, and it is difficult to purify and comprehensively utilize it. Most phosphate fertilizer enterprises still adopt the process of absorbing fluorine-containing waste gas through water and discharging it. The low-concentration fluosilicic acid produced is discharged because it cannot be used well, which is wasteful and causes secondary pollution. [0003] Low-concentration fluosilicic acid is a hazardous waste that must be treated before it can be discharged. Since the 1960s, my country began to study the treatment and utilization of fluorine-containing waste gas and achieved certain ...

Claims

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Application Information

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IPC IPC(8): C02F1/00B01D1/18B01D53/18C02F101/14
CPCB01D1/18B01D53/18B01D2257/20C02F1/00C02F2101/14
Inventor 王庄陈家荣
Owner 云南凯威特新材料股份有限公司