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

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...

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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 of biological toxicity or high processing costs have resulted in a large amount of chlor-alkali salt mud being piled up or discarded or buried in soil, and even caused tragic major pollution incidents in the deep desert. There is also a lack of a cement kiln that can effectively co-process chlor-alkali salt mud method