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Method for producing high-efficiency purifying agent magnesium ferrous sulfate from titanium dioxide waste acid by using sulphuric acid method

A technology of magnesium ferrous sulfate and titanium dioxide waste acid, applied in magnesium sulfate, ferric sulfate, flocculation/sedimentation water/sewage treatment, etc., can solve the problem of ineffective treatment of severe sewage, complex equipment and processes, and increase production costs, etc. problem, to achieve the effect of simple and practical equipment, low production cost, simple and convenient operation and use

Inactive Publication Date: 2010-07-14
孙宝钦 +1
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, its equipment and process are relatively complicated, and it has no advantageous effect on the treatment of heavy sewage, and the raw materials used contain nitric acid, which causes new pollution in the production process. If the harmful gas produced is recycled, it will increase additional Equipment investment, increased production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 The diameter of the reaction tank is 3 meters, and the height is 3 meters. In the reaction tank, 4.8 m of mother liquor water is put into (tap water is used when there is no mother liquor water), and the stirring speed of the agitator is 40 to 80 rpm. The Baume hydrometer measures the specific gravity of the mixed solution. When adding about 1 ton of magnesite containing 85% MgO, the specific gravity of the mixed solution is about 1.30 to 1.38 (the density of the Baume hydrometer). The method of specific gravity is used to control the addition of magnesite, and then gradually add waste sulfuric acid (containing 17-22% of sulfuric acid) produced in the production process of sulfuric acid titanium dioxide to the reaction tank until the pH value of the mixed solution is 3.5-4.0 Stop adding waste sulfuric acid, continue to stir, and control the reaction temperature at no more than 95°C to avoid boiling the mixed solution. After 1.5 hours of reaction, the pH valu...

example 2

[0026] Example 2 The reaction pool has a diameter of 3 meters and a height of 3 meters. Put 5m of mother liquid water into the reaction tank 3 , the stirring speed is 50-70 rpm. Gradually add magnesite with an MgO content of 90%. When the specific gravity of the mixed solution is 1.34 to 1.38 (Baume pycnometer density), the amount of magnesite will reach about 1 ton. At this time, the addition of magnesite can be stopped. , and then intermittently add waste sulfuric acid containing about 20% sulfuric acid to the reaction tank, control the reaction temperature at no more than 95°C, and stop adding waste sulfuric acid when the pH value of the mixed solution is 3.5 to 3.8. After 2.5 hours of reaction, the pH value of the mixed solution rose to 4.7-5.2, at this time the specific gravity of the mixed solution was about 1.40-1.45 (Baume hydrometer density), and the temperature was about 90°C. After the reaction, the mixed liquid is filtered with a plate and frame filter press, and...

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Abstract

The invention discloses a method for producing a high-efficiency purifying agent magnesium ferrous sulfate from titanium dioxide waste acid by using a sulphuric acid method, aims to overcome the defect of the commonly used purifying agent at present, solves the problem of waste acid pollution in a titanium dioxide plant and provides a method for producing the purifying agent. The method comprises the following steps: putting mother liquor into a reaction pool; adding magnesia with the MgO content of more than or equal to 85 percent into the mother liquor; mixing with a stirrer; controlling the adding amount of the magnesia by using a method of measuring the specific gravity of mixed liquor with a Baume hydrometer; controlling the adding amount of waste sulphuric acid by using a method of detecting the pH value of the mixed liquor; controlling the reaction temperature not to exceed 95 DEG C; performing pressure filtration on a reacted mixed liquor with a pressure filter after the reaction is performed for 1.5 to 2.5 hours; delivering filtrate to a cooling bath for initial cooling and then delivering the filtrate to a cooling tank with a pump; further cooling the filtrate through stirring; discharging when the temperature is reduced to 10 to 30 DEG C; putting the cooled filtrate to a crystallizing pool to crystallize and precipitate naturally; and drying a precipitated product to obtain a granular product.

Description

technical field [0001] The invention belongs to the technical field of water treatment agents, and in particular relates to a method for producing ferrous magnesium sulfate, a high-efficiency water purifier, by using titanium white waste acid from a sulfuric acid process. Background technique [0002] Currently commonly used water purifiers include aluminum sulfate, polyaluminum chloride, ferrous sulfate, ferric chloride, polyferric sulfate, etc. These water purifiers still have some shortcomings in some aspects, such as: for heavy metal ions, SS, The removal effect of COD, BOD, etc. is poor; the chemical properties are unstable, and it is not suitable for long-term storage; especially the removal effect on chroma is not satisfactory. Chinese patent document CN1035473C introduces a production method of solid polyferric sulfate (patent No. 94111095.8). Its product is a high-efficiency sewage purifying agent, which can purify drinking water, process industrial sewage, and urba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14C01F5/40C02F1/52
Inventor 孙宝钦李启军李金水张芳朋
Owner 孙宝钦
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