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Method for treating waste generated in process of producing calcium oxide from calcium sulfate

A treatment method, calcium sulfate technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve problems such as difficult and efficient treatment, and achieve the effect of improving utilization rate and accelerating dispersion

Active Publication Date: 2015-03-11
XIANGFU NEW BUILDING MATERIAL HUNAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the deficiency that gas-solid wastes are not easy to be efficiently treated in the process of producing calcium oxide from calcium sulfate, and to provide a waste treatment method with high efficiency using calcium sulfate to produce calcium oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment includes the following steps:

[0023] (1) feed into the bottom of calcium sulfate, coke raw material in the calcining kiln and be the oxygen of 99% in volume concentration, the pressure of oxygen is kept as 0.15MPa; The pore size is smaller than the minimum diameter of calcium sulfate powder;

[0024] Described calcium sulfate, coke are the 800 mesh powders of pulverizing;

[0025] (2) Pass the mixed gas discharged from the calcining kiln into the spiral pipe containing the granular dilumumium pentoxide catalyst, raise the ambient temperature in the pipe and keep it at 550°C;

[0026] The ratio of pitch to diameter of the helical pipeline is 1.5:1;

[0027] (3) The mixed gas discharged in the spiral pipeline passes through the NaOH solution of 98wt% vitriol oil and 60wt% successively;

[0028] (4) The gas discharged from the NaOH solution is returned and the oxygen with a volume concentration of 99% is combined and passed into the calcining kiln.

...

Embodiment 2

[0031] This embodiment includes the following steps:

[0032] (1) feed into the bottom of calcium sulfate, coke raw material in the calcining kiln and be the oxygen of 99% in volume concentration, the pressure of oxygen is kept as 0.10MPa; The pore size is smaller than the minimum diameter of calcium sulfate powder;

[0033] Described calcium sulfate, coke are pulverized 1000 mesh powders;

[0034] (2) Pass the mixed gas discharged from the calcining kiln into the spiral pipe containing the granular dilumumium pentoxide catalyst, and raise the ambient temperature in the pipe and keep it at 630°C;

[0035] The ratio of the pitch of the spiral pipeline to the diameter is 2:1;

[0036] (3) The mixed gas discharged in the spiral pipeline passes through the NaOH solution of 98wt% vitriol oil and 60wt% successively;

[0037] (4) The gas discharged from the NaOH solution is returned and the oxygen with a volume concentration of 99% is combined and passed into the calcining kiln. ...

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Abstract

The invention relates to a method for treating waste generated in a process of producing calcium oxide from calcium sulfate, which comprises the following steps: (1) introducing oxygen with the volume concentration of not less than 99% into the bottom of raw materials calcium sulfate and coke in a calcining kiln, wherein the pressure of the oxygen is kept at 0.05-0.2 MPa, and the introduction port of the oxygen gas is provided with a plurality of small micropores of which the pore sizes are less than the minimum diameter of the calcium sulfate powder; (2) introducing a gas mixture discharged from the calcining kiln into a spiral duct containing a catalyst, and keeping the temperature at 100-850 DEG C; (3) sequentially passing the gas mixture discharged from the spiral duct through concentrated sulfuric acid and an NaOH solution; and (4) returning the gas discharged from the NaOH solution to the oxygen with the volume concentration of 99%, merging, and introducing the mixture into the calcining kiln. The invention reasonably utilizes waste generated in the process of producing calcium oxide from calcium sulfate, and enhances the utilization ratio of the waste and the conversion rate of the product, wherein the purity of the product calcium oxide can reach 99.8%, and the absorptivity of gas sulfur dioxide can reach 99.9%.

Description

technical field [0001] The invention relates to a waste treatment method, in particular to a waste treatment method using calcium sulfate to produce calcium oxide. Background technique [0002] In the process of conventional high-temperature calcining of calcium sulfate to produce calcium oxide, solid fuels are generally introduced, such as coke, which is used to calcinate calcium sulfate by using the heat released when coke is burned, so that it can obtain high temperature and decompose. At the same time, coke is used as a The reducing agent also undergoes a redox reaction with calcium sulfate to generate calcium sulfide and CO. The reaction process is as follows: [0003] [0004] [0005] [0006] Therefore, not only will a large amount of SO be produced in this process 2 , CO, CaS and other wastes, of which SO 2 , CO is a poisonous and harmful gas, which will pollute the environment when discharged into the atmosphere, while CaS will appear in the form of imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/04
Inventor 刘立文刘珍如宁爱民宁勇宁江天刘勇鲁纪鸣
Owner XIANGFU NEW BUILDING MATERIAL HUNAN