Closed-circuit recycling process of waste gas and waste residue generated during production of brown fused alumina and calcium carbide

A closed-loop, brown corundum technology, used in waste treatment, solid waste removal, inorganic chemistry, etc., to achieve the effect of huge market capacity

Inactive Publication Date: 2012-06-20
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no public report on the preparation of high-grade aluminum-containing silica from the soot generated in the production of brown fused alumina
On the other hand, in the simultaneous comprehensive utilization of brown corundum and calcium carbide produced in the production of CO 2 There are no public reports on the closed-circuit circulation process of chemical products including aluminum-containing silica, high-grade nano-calcium carbonate, and waterproof and heat-insulating powder in the production of flue gas, corundum soot, and carbide slag.

Method used

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  • Closed-circuit recycling process of waste gas and waste residue generated during production of brown fused alumina and calcium carbide
  • Closed-circuit recycling process of waste gas and waste residue generated during production of brown fused alumina and calcium carbide
  • Closed-circuit recycling process of waste gas and waste residue generated during production of brown fused alumina and calcium carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] The dust collected in the production of brown fused alumina, the calcium carbide slag generated in the calcium carbide industry, and the CO contained in the production process of brown fused alumina 2 Flue gas is used as raw material to produce high-grade aluminum-containing silica and nano-calcium carbonate.

[0024] The technological process of this embodiment sees attached figure 1 .

[0025] In the first step, the CO containing CO produced in the production of brown corundum and calcium carbide 2 The flue gas is purified and recovered, and is ready for use. The flue gas purification is to purify the flue gas through the gravity dust collector, cyclone dust collector, and leaching tower in sequence, and then enter the gas-water separator to remove most of the water and then store it. in CO 2 Stand-by in the gas storage tank;

[0026] In the second step, the soot ash produced in the production of brown corundum is mixed with sodium hydroxide solution, and then fil...

Embodiment approach 2

[0030] In the first step, the CO containing CO produced in the production of brown corundum and calcium carbide 2 The flue gas is purified and recovered, and is ready for use. The flue gas purification is to purify the flue gas through the gravity dust collector, cyclone dust collector, and leaching tower in sequence, and then enter the gas-water separator to remove most of the water and then store it. in CO 2 Stand-by in the gas storage tank;

[0031]In the second step, the soot ash produced in the production of brown corundum is mixed with sodium hydroxide solution, and then filtered after alkali leaching reaction under normal pressure to obtain a low aluminum sodium silicate solution and the first filter residue, which is used for later use; the alkali The liquid-solid ratio of the soaking reaction system is 4: 1, the mass percentage concentration of sodium hydroxide solution is 25%, 110 ℃ of reaction temperature, 2 hours of reaction time; The first step is stored in CO 2...

Embodiment 3

[0035] In the first step, the CO containing CO produced in the production of brown corundum and calcium carbide 2 The flue gas is purified and recovered, and is ready for use. The flue gas purification is to purify the flue gas through the gravity dust collector, cyclone dust collector, and leaching tower in sequence, and then enter the gas-water separator to remove most of the water and then store it. in CO 2 Stand-by in the gas storage tank;

[0036] In the second step, the soot ash produced in the production of brown corundum is mixed with sodium hydroxide solution, and then filtered after alkali leaching reaction under normal pressure to obtain a low aluminum sodium silicate solution and the first filter residue, which is used for later use; the alkali The liquid-solid ratio of the immersion reaction system is 3: 1, the mass percent concentration of sodium hydroxide solution is 50%, 120 ℃ of reaction temperatures, 1.5 hours of reaction time; The first step is stored in CO...

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Abstract

A closed-circuit recycling process of waste gas and waste residue generated during the production of brown fused alumina and calcium carbide is a closed-circuit recycling process which utilizes flue dust and flue gas containing carbon dioxide collected when brown fused alumina is produced as well as calcium carbide residue and flue gas containing carbon dioxide when calcium carbide is produced toproduce high-grade silica, high-grade nanometer calcium carbonate and waterproof heat insulation powder. The closed-circuit recycling process comprises the following steps: fused alumina flue dust isimmerged in alkali and dissolved out in normal pressure; calcium carbide residue is calcined and nitrated; and carbon dioxide obtained when the flue gas is purified is used for carbonating alkali immersion liquid of fused alumina flue dust and nitrating serum. By adoption of the process provided by the invention, waste gas and waste residue generated when brown fused alumina and calcium carbide are produced are transformed into valuable chemical products, so that internal cycling of material is realized, three wastes are emitted outside no longer, and secondary pollution is avoided. The process is suitable for industrial application.

Description

technical field [0001] The invention relates to a process for closed-circuit recycling of waste gas and waste slag produced in the production of brown fused alumina and calcium carbide. 2 Flue gas, corundum soot and carbide slag are used as the main raw materials to produce closed-loop process of chemical products including aluminum-containing silica, high-grade nano-calcium carbonate and waterproof and heat-insulating powder. Background technique [0002] The output of calcium carbide and brown fused alumina in my country is huge, and the calcium carbide slag, corundum soot and CO 2 Exhaust gas has caused huge pollution to the environment. At present, in terms of the utilization of calcium carbide waste residue, the patent CN1377830 has announced that the CO produced in the production of calcium carbide waste residue slurry and lime 2 As raw material, light calcium carbonate is produced by normal pressure carbonization method; patent CN91105487.1 has announced that the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D50/00B09B3/00C01B31/22C01B31/20C01B33/12C01F11/18C04B28/00C01B32/50C01B32/55
CPCY02W30/20
Inventor 周向阳孙宏原杨娟邵建荣伍上元刘宏专
Owner CENT SOUTH UNIV
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