Method for cooperative treatment of chlor-alkali salty mud by cement kiln

A co-processing, cement kiln technology, applied in water/sludge/sewage treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of small treatment capacity, accumulation of biotoxicity, lack of chlor-alkali salt sludge, etc.

Active Publication Date: 2020-10-23
长沙紫宸科技开发有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] Obviously, whether the above method is for non-mercury salt mud or mercury-containing salt mud, there are obvious or small treatment capacity, or high energy consumption, or secondary pollution, or only pollution transfer, or affect product quality, or cause Problems or deficiencies such as the accumulation o

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In this embodiment, the chlor-alkali salt mud stored in the warehouse of a certain salinization enterprise is selected, which is in a semi-solid state. The solid waste treatment technology center of a certain university used gravimetric method, mercury content method, spectroscopic analysis method (ICP-AES), and diffraction analysis method to analyze the samples. The main mineral composition of salt mud (homogeneous sample) is: water 19.71%, Sodium chloride 8.62%, calcium carbonate 49.74%, magnesium hydroxide 6.97%, sodium silicate 4.10%, sodium carbonate 3.02%, barium carbonate 2.84%, aluminum hydroxide 0.86%, iron hydroxide 0.25%, crystalline silicon 2.90%, Organic matter 0.81%, heavy metals Pb 0.071%, Cd 0.045%, Hg 0.064%, is mercury-containing carbonate type salt mud.

[0053] The ridge agent used in this embodiment is selected from clinker powder; the heavy metal ion precipitant is selected from phytic acid; the dust removal flue gas at the kiln tail is introduced ...

Embodiment 2

[0068]In this embodiment, the chlor-alkali salt mud from the open-air waste dump of a salinization enterprise is selected, which is a water-containing viscous paste. The solid waste treatment technology center of a certain university used gravimetric method, mercury content method, spectroscopic analysis method (ICP-AES), and diffraction analysis method to analyze the samples. The main mineral composition of salt mud (homogeneous sample) is: water 31.64%, Sodium chloride 7.87%, calcium carbonate 46.41%, magnesium hydroxide 5.49%, sodium silicate 4.19%, aluminum hydroxide 0.63%, iron hydroxide 0.24%, and others 3.53%, are non-mercury carbonate type salt mud.

[0069] The ridge agent used in this example is the clinker powder produced by the cement factory; the alkali replacement agent is lime; the dust removal gas at the kiln tail is introduced from the pipeline behind the bag filter at the kiln tail; The hot air adopts the 200 ℃ ~ 300 ℃ waste heat hot air produced by the heat ...

Embodiment 3

[0086] In this embodiment, the chlor-alkali salt mud from the open-air waste dump of a salinization enterprise is selected, which is a water-containing viscous paste. The solid waste treatment technology center of a certain university used gravimetric method, mercury content method, spectral analysis method (ICP-AES), and diffraction analysis method to analyze the samples. The main mineral composition of salt mud (homogeneous sample) is: water 33.74%, Sodium chloride 6.77%, calcium carbonate 47.83%, magnesium hydroxide 5.79%, sodium silicate 4.84%, aluminum hydroxide 0.68%, iron hydroxide 0.17%, other 0.18%, are non-mercury carbonate type salt mud.

[0087] The ridge agent used in this example is sodium fluorosilicate and 42.5 grade cement powder produced by the cement factory, wherein the mass ratio of sodium fluorosilicate to cement powder is 1:27; The hot air containing oxygen used to process the filtrate boiling and drying to make industrial salt is to recover the 200 ℃ ~ ...

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Abstract

The invention relates to a method for cooperative treatment of chlor-alkali salty mud in a cement kiln. The method comprises the following steps: (1) granulating dechlorinated salt; and (2) cement kiln cooperative treatment. The method is simple in process, low in treatment energy consumption, low in treatment cost, free of secondary pollution and easy to apply and popularize; chlorine salt, mercury and other heavy metals in the chlor-alkali salty mud are effectively removed; industrial salt can be simply and effectively recovered; the sand granulated dechlorinated salty mud convenient to useis obtained; secondary pollution possibly caused by chlorine salt, heavy metal mercury easy to reduce and volatilize and the like, influence on a kiln system and influence on cement hydration performance are prevented; the granulated, dechlorinated and detoxified salty mud solid particles can be used as an active admixture, or used as a high-quality siliceous raw material and calcareous raw material with clinker seed crystal sintering assistance, or used as a thickening time control agent instead of gypsum, and are cleanly used for cement kiln system cooperative treatment, thereby being beneficial to environmental protection, energy saving and emission reduction.

Description

technical field [0001] The invention relates to a method for recycling chlor-alkali salt mud, in particular to a method for co-processing chlor-alkali salt mud by a cement kiln. Background technique [0002] Chlor-alkali salt mud is a precipitate formed by the reaction of sodium hydroxide, sodium carbonate, ferric chloride and other refined agents with soluble impurities in the brine refining process of chlor-alkali enterprises in the production of alkali by ion membrane method (electrolytic production of chlorine, hydrogen and caustic soda). Preprocessor, HVM membrane filter, post-reaction tank discharge, filter press dehydration, water washing, or air-dried waste residue. At present, my country's caustic soda production capacity is nearly 50 million t / a, and domestic devices produce 50-60 kg of salt mud for every 1 ton of caustic soda produced. Due to different sources of raw materials, different processes or different improvement methods of the same process, the main min...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/44C04B18/04C04B22/00C02F9/04C02F101/20
CPCC04B7/24C04B7/44C04B18/04C04B18/0418C04B22/0006C02F9/00C02F1/001C02F1/52C02F1/00C02F2101/20Y02W30/91
Inventor 尹小林余智英宋剑飞
Owner 长沙紫宸科技开发有限公司
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