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Process for producing hydrated lime by using acetylene sludge

A calcium hydroxide and production process technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of easy leakage and pollution of road surfaces, large land occupation, land erosion, etc., and achieve considerable economic benefits and production The effect of low cost and simple production process

Inactive Publication Date: 2009-08-19
王红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most PVC manufacturers separate the calcium carbide slag slurry by gravity sedimentation, and then recycle the supernatant; after further dehydration, the calcium carbide slag still has a moisture content of 40% to 50%, and it is in the form of paste, which is easy to leak and pollute during transportation. On the pavement, long-term accumulation not only occupies a large amount of land, but also has a serious erosion effect on the land
For a long time, the industrial waste of calcium carbide slag has not been effectively utilized and treated, which has caused environmental pollution and wasted resources

Method used

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  • Process for producing hydrated lime by using acetylene sludge
  • Process for producing hydrated lime by using acetylene sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown in the flow chart of the production process of hot flue gas, the hot flue gas comes from the calcining furnace, specifically: the project adopts a two-stage gas generator, and the produced gas enters the water washing tower after cyclone dust removal and electric tar capture. , Into the calciner in the production workshop to provide hot flue gas for production. The project uses coal mixed with calcium carbide slag for desulfurization, the calcium-sulfur ratio (weight) is 1:5, and the desulfurization efficiency is about 60% or more.

[0022] Such as figure 2 The production process flow chart of using calcium hydroxide slag to prepare calcium hydroxide is shown: because the calcium carbide slag contains a large amount of impurities, the particle size distribution of the impurities is wide, and it is not easy to separate. Before the calcium carbide slag enters the sedimentation tank, it enters the hydrocyclone or vibrating screen Wait for screening e...

Embodiment 2

[0024] The temperature of the primary drying is 50℃, and the time is 30h; the hot flue gas of the secondary drying comes from the electric furnace (the method of generating hot flue gas from the electric furnace is a conventional method, and the production process flow chart is omitted), and the temperature of the secondary drying is 200℃ , The time is 5s; the primary drying is carried out in a tumble dryer; the secondary dryer uses a flash dryer, the flash dryer also has a feeding part, the feeding part is equipped with a dispersing device, and the flash dryer is the same Working in a fully enclosed state, the flash dryer is about 3 to 8 meters high, hot flue gas enters from the bottom, and a high-speed rotating hot air flow is formed in the flash dryer. The hot air flow and the materials that are strongly dispersed by the dispersing device The material forms a suspended fluidized movement, and the heat and mass exchange is completed instantly. The other processes and the equipme...

Embodiment 3

[0026] The temperature of the primary drying is 150℃, and the time is 8h; the hot flue gas of the secondary drying comes from a hot blast stove (the hot blast stove generates hot flue gas is a conventional method, and the production process flow chart is omitted), and the temperature of the secondary drying is 600°C, the time is 1s; the primary drying is carried out in a paddle dryer; the other processes and the equipment used are the same as in Example 1.

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Abstract

The invention belongs to the technical field of acetylene sludge application and the technical field of production process of calcium hydroxide, in particular to a production process for preparing the calcium hydroxide by the acetylene sludge. The production process comprises the following steps that: the acetylene sludge material is subjected to screening, impurity removing and dehydrating, and is dried; and after the dried material is separated and collected, a finished product of the calcium hydroxide is prepared. Drying is separated into primary drying and secondary drying to be carried out in sequence. Furthermore, the temperature of the primary drying is between 50 and 150 DEG C, and time is between 10 and 40 hours; and the temperature of the secondary drying is between 200 and 600 DEG C, and time is between 1 and 5 seconds. The process has the advantages of simple production process, low production cost, changes waste into valuable, realizes reasonable utilization of wastes, and has wide market prospect and considerable economic benefit.

Description

Technical field [0001] The invention belongs to the technical field of application of calcium hydroxide slag, and at the same time belongs to the technical field of calcium hydroxide production technology, and specifically relates to a production process for preparing calcium hydroxide using calcium hydroxide slag. Background technique [0002] Acetylene (C 2 H 2 ) Is one of the important raw materials of the basic organic synthesis industry, with calcium carbide (CaC 2 ) Is the raw material, and the process of producing acetylene by adding water (wet method) is simple and mature. It has more than 60 years of industrial history and still accounts for a large proportion in my country. Adding 1 ton of calcium carbide with water can generate more than 300 kg of acetylene gas, and at the same time generate 1.5 to 2 tons of industrial waste liquid with a solid content of about 12%, commonly known as calcium carbide slag slurry. Acetylene is the main raw material for the production of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02
Inventor 王红李鹏朱桐新郭海龙王新生
Owner 王红
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