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A method for comprehensive utilization of chemical gypsum and carbide slag

A chemical gypsum, carbide slag technology, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve problems such as unreported, and achieve the effects of short process, improved sulfuric acid quality, and power saving effect

Active Publication Date: 2017-05-31
YUNNAN YUNTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, how to make full use of a large amount of chemical gypsum and calcium carbide slag produced in chemical production to save resources and protect the environment has become a technical problem to be solved urgently in the chemical industry, but there is no good solution in the prior art
Especially about the comprehensive utilization of chemical gypsum and calcium carbide slag to produce sulfuric acid and the method of cement clinker simultaneously also do not see the report

Method used

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  • A method for comprehensive utilization of chemical gypsum and carbide slag
  • A method for comprehensive utilization of chemical gypsum and carbide slag
  • A method for comprehensive utilization of chemical gypsum and carbide slag

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Effect test

Embodiment 1

[0024] When the chemical gypsum used is piled in the slag yard and has relatively low water content, such as chemical gypsum with an external water content of 15.26% (see Table 1 for raw material composition), the lime saturation coefficient of the rotary kiln clinker is 0.90 The formula of ~0.94 requires calculation to obtain the ratio of various raw materials.

[0025] Table 1 Example 1 Raw material composition and clinker composition

[0026]

[0027]

[0028] Such as figure 1 Shown: the gypsum raw material accounting for 53% of the total chemical gypsum is metered from the feeder 2 into the pipeline, and the heat is exchanged with the exhaust gas from the reduction furnace 5 through the cyclone preheater CB2 to be cooled to below 750°C. After the chemical gypsum is dried and dehydrated, it undergoes gas-solid separation through the cyclone preheater CB1. The separated material enters the inlet pipe of the next cyclone preheater CB2 to continue heating and dehydration. After the...

Embodiment 2

[0046] When the chemical gypsum raw material used is a wet-process phosphoric acid filter, such as phosphogypsum with a moisture content of 25.78% (see Table 2 for raw material composition), it can be calculated according to the formula requirement that the lime saturation coefficient of the rotary kiln clinker is 0.90~0.94 The ratio of various raw materials.

[0047] Table 2 Example 2 Raw material composition and clinker composition

[0048]

[0049]

[0050] Such as figure 1 As shown, the phosphogypsum, which accounts for 52% of the total phosphogypsum, is metered from the feeder 2 into the pipeline and exchanges heat with the exhaust gas from the reduction furnace 5 through the cyclone preheater CB2 to be cooled to below 660°C. After the phosphogypsum is dried and dehydrated, it undergoes gas-solid separation through the cyclone preheater CB1. The separated material enters the inlet pipe of the next cyclone preheater CB2 to continue heating and dehydration. After separation by t...

Embodiment 3

[0055] When the supply of hydrogen sulfide gas is insufficient or there is no hydrogen sulfide gas, the fuel added from the kiln fuel adding device 6 can use liquid sulfur as a supplementary or alternative fuel. Others are the same as in Example 1.

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Abstract

The invention discloses a comprehensive utilization method of chemical gypsum and carbide slags. The method comprises the steps that exhaust gas produced after the chemical gypsum is dried is used for drying the carbide slags, the chemical gypsum is dried and dewatered through tandem preheaters, the exhaust gas exhausted from the preheaters enters a beating and drying machine and is used for drying the carbide slags, and sulfur dioxide in the exhaust gas is removed; the dried carbide slags directly enter a rotary kiln and is mixed and calcined with materials from a reduction furnace to obtain sulfur dioxide gas and cement clinker, heat in the sulfur dioxide gas is recycled through a boiler, and sulfuric acid is prepared through the processes such as dedusting and purifying according to a traditional method. According to the comprehensive utilization method of the chemical gypsum and the carbide slags, existing equipment is fully utilized, the chemical gypsum, carbide slag drying, reduction decomposition and rotary kiln calcination are organically combined into a whole, the processes are brief, stepped reasonable utilization of energy is achieved, and the coal-saving and electricity-saving effects are significant.

Description

Technical field [0001] The invention belongs to the technical field of sulfuric acid production, and relates to the comprehensive utilization of industrial waste chemical gypsum and calcium carbide slag produced in the production of wet-process phosphoric acid, in particular to a method for simultaneously producing sulfuric acid and cement clinker by using chemical gypsum and calcium carbide slag. Background technique [0002] Chemical gypsum is produced in the process of industrial production. Industrial waste residues with calcium sulfate as the main component mainly include phosphogypsum, desulfurized gypsum, and fluorogypsum. Among them, phosphogypsum is a waste produced when sulfuric acid is used to decompose phosphate rock in chemical production. The amount is huge. If it is not handled properly, it will affect the environment. In the world, most of the treatment of phosphogypsum is buried. However, due to the lack of sulfur resources, my country has been committed to the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/76C04B7/44
Inventor 张应虎李天荣李国鹏
Owner YUNNAN YUNTIANHUA
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