Apparatus and method for producing magnesium sulfate

A magnesium sulfate and sulfuric acid-containing technology, applied in the direction of magnesium sulfate, separation methods, chemical instruments and methods, etc., can solve the problems of poor quality, low evaporation and concentration efficiency, and large steam consumption, so as to reduce dust and impurity content, reduce Desulfurization operation cost, effect of quality improvement

Active Publication Date: 2017-01-11
ZHONGJING ENVIRONMENTAL TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

Adopting the device and method of the present invention can solve the problem of low evaporation and concentration efficiency, large steam consumption, high dust and impurity content and poor quality in the magnesium sulfate finished product in the process of producing magnesium sulfate from magnesium desulfurization waste liquid at present, production cost per ton of ore and desulfurization. The problem of high running costs

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  • Apparatus and method for producing magnesium sulfate
  • Apparatus and method for producing magnesium sulfate

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0058] use figure 1 A specific embodiment of described device producing magnesium sulfate, described method comprises the steps:

[0059] a. The flue gas enters the desulfurization tower 1 from the flue gas inlet 23 of the desulfurization tower 1, enters the evaporation concentration spray layer 3 after passing through the emergency cooling layer 24, and enters the secondary SO 2 Absorption spray layer 7 and tertiary SO 2 The absorption spray layer 8 performs desulfurization absorption reaction, and finally enters the demister 9 for dehydration and demisting, and then directly discharges through the top chimney flue gas outlet 10;

[0060] b. From secondary SO 2 Absorption spray layer 7 and tertiary SO 2 The mixed solution after absorbing sulfur dioxide from the absorbing spray layer 8 enters the slurry circulation tank 11 through the accumulator 4;

[0061] c. The absorption liquid pumped out from the slurry circulation pool 11 is discharged into the first filter 22 throu...

Embodiment 1

[0066] Example 1 Sintering machine flue gas desulfurization project

[0067] Step 1: Add industrial tap water to magnesium oxide powder to make magnesium hydroxide slurry, and send it to desulfurization tower 1.

[0068] Step 2: Let the sintering machine flue gas (with an oxygen content of 13vt%) with a flow rate of 2.5-3.5m / s and a temperature of 110-180°C enter the desulfurization tower 1 from the flue gas inlet 23 of the desulfurization tower, and transfer the slurry at the bottom of the desulfurization tower The pH value of the circulation pool 11 is controlled between 5.5-7.

[0069] Step 3: Control the pH value of the evaporative concentration slurry pool 26 between 4.5-6.

[0070] Step 4: Pass the secondary SO 2 Absorption circulation pump 13, three-stage SO 2 The absorption circulation pump 14 sends the slurry to the secondary SO 2 Absorption spray layer 7, three-stage SO 2 The absorption spray layer 8, after the absorption reaction, the slurry falls into the ac...

Embodiment 2

[0084] Example 2 Coal-fired boiler flue gas desulfurization project

[0085] The implementation steps of embodiment 2 are exactly the same as embodiment 1 except that the flue gas used is coal-fired boiler flue gas (oxygen content is adjusted to 13vt%).

[0086] For the coal-fired boiler flue gas desulfurization project in Example 2, its operating parameters, emissions and by-product quality are shown in Table 4-5 below.

[0087] Table 4 Working condition parameter list of 200t / h coal-fired boiler flue gas desulfurization project

[0088] serial number project quantity unit 1 Flue gas volume at the inlet of the desulfurization system (working condition) 365000 m 3 / h

[0089] Table 5 Emissions and magnesium sulfate output of coal-fired boiler flue gas desulfurization project

[0090] serial number project quantity unit 1 Flue gas volume at the outlet of the desulfurization unit (working condition) 386085 m 3 / h

[0091] ...

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Abstract

The invention provides a device and a method for producing magnesium sulfate and specifically provides a device and a method for producing the magnesium sulfate by virtue of sectionalized crystallization in a magnesium oxide method-based desulfuration waste liquid tower. The device comprises a desulfuration tower, a crystallizer and a dryer, wherein the desulfuration tower comprises an absorption section, a slurry collection section, a first slurry receiving section, a second slurry receiving section, an evaporation and concentration section and a settling section. The device and the method for producing the magnesium sulfate are capable of solving the problems of low evaporation and concentration efficiency, high steam consumption, high content of dust and impurities in the finished product magnesium sulfate, poor quality, and relatively high production cost per ton of ores and desulfuration operating cost in the process of producing the magnesium sulfate from magnesium method-based desulfuration waste liquid at present.

Description

technical field [0001] The invention relates to a device and a method for producing magnesium sulfate, in particular to a device and a method for producing magnesium sulfate by zone crystallization in a desulfurization waste liquid tower by a magnesium oxide method. The device and method of the present invention are especially suitable for fields requiring flue gas desulfurization, such as coal-fired boilers, sintering machines, pellets, and flue gas from rotary kilns. Background technique [0002] Magnesium oxide flue gas desulfurization technology has gradually been popularized and applied, and the market share has risen from less than 1% in 2005 to over 6% at present. Wet magnesium oxide method desulfurization technology has been recognized by more and more people. Using magnesium oxide desulfurization process and preparing desulfurization waste liquid to generate magnesium sulfate by-product not only solves the problem of desulfurization gypsum produced by traditional ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50C01F5/40
Inventor 童裳慧
Owner ZHONGJING ENVIRONMENTAL TECH CO LTD
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