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Calcium carbide, polyvinyl chloride, soda and chloro-alkaline combined device and method for saving energy, reducing discharge and preparing alkali from waste slag

A technology of calcium carbide slag and soda ash, which is applied in chemical instruments and methods, alkali metal compounds, solid waste removal, etc., can solve the problems of environmental pollution, water source and resource consumption, resource waste, etc., and achieve reduction of waste liquid discharge and more energy Level utilization, the effect of improving economic benefits

Inactive Publication Date: 2008-05-28
中国天辰化学工程公司
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Problems solved by technology

[0003] The production of polyvinyl chloride (PVC) using calcium carbide as raw material emits a large amount of calcium carbide slag, the main component of which is calcium hydroxide, which consumes water and resources. If it is not recycled, it will pollute the environment and cause waste of resources

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  • Calcium carbide, polyvinyl chloride, soda and chloro-alkaline combined device and method for saving energy, reducing discharge and preparing alkali from waste slag

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Embodiment Construction

[0015] Take the example of the 400,000 tons / year soda production project of comprehensive recovery of calcium carbide slag:

[0016] As shown in the process shown in Figure 1, the 400,000 tons / year calcium carbide slag comprehensive recovery equipment for alkali production, including calcium carbide, polyvinyl chloride, soda ash, and chlor-alkali equipment, is a combined process integration. The raw material requirements in each independent device are analyzed as follows:

[0017] 1. The basic requirements for the production of soda ash by the ammonia-soda process

[0018] 1) CaO needed for soda ash production

[0019] The production of soda ash by the ammonia-soda process requires calcium oxide, which is used as an auxiliary material to react with the ammonium chloride in the mother liquor of soda production to recover the ammonia used in the reaction process. Each ton of soda ash requires 0.900 tons of lime. A separate ammonia-soda production plant must be equipped with a lime k...

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Abstract

The invention relates to a device and a method thereof that uses calcium carbide, polyvinyl chloride, soda and chlor-alkali in combination to save energy, reduce discharge and produce alkali from waste residue, in particular to the device and the method that uses the exhaust generated from calcium carbide production and the carbide slag generated from acetylene production to produce soda, which comprises a limestone calcinations device, a calcium carbide furnace, an acetylene production device, a polyvinyl chloride synthesizer and a soda generation device, wherein, the acetylene production device is connected with the polyvinyl chloride synthesizer; the carbide slag of the acetylene production device is connected with the soda generation device; the exhaust pipe of the calcium carbide furnace is connected with the limestone calcinations device; the kiln gas decomposed from the limestone calcinations device is connected with the soda generation device. The crude salt, carbon dioxide which is introduced into the soda generation device through a limekiln and carbide slag which introduced into the soda generation device through the acetylene production device are compounded in the soda generation device to synthesize the soda. The invention lowers the production cost and realizes the multistage utilization of energy in an omnidirectional way, which greatly reduces the exhaust of green house gas carbon dioxide and mining, thus achieving the environmental protection and circular economy.

Description

Technical field [0001] The invention belongs to the technology of energy saving and emission reduction, waste slag soda production, which makes the production of calcium carbide, polyvinyl chloride, soda ash, and chlor-alkali into a united body, and uses waste gas produced by the calcium carbide furnace to calcinate limestone and the device and method for producing soda ash from calcium carbide slag produced by acetylene. Background technique [0002] Calcium carbide production is a big energy consumer. The waste gas discharged from calcium carbide furnace contains a certain calorific value and is worth recycling. The effective components in the waste gas are raw materials for soda ash production. [0003] The production of polyvinyl chloride (PVC) with calcium carbide as raw material emits a large amount of calcium hydroxide slag, the main component of which is calcium hydroxide, which consumes water and resources. If it is not recycled, it will pollute the environment and cause...

Claims

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Application Information

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IPC IPC(8): C01D7/00B09B3/00
CPCY02P20/10
Inventor 胡书亚张宇杨克俭程鹏
Owner 中国天辰化学工程公司
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