Treatment process for stable dehydration of ammonia-alkali process alkali residues

Abstract

The invention discloses a treatment process for stable dehydration of ammonia-alkali process alkali residues. By taking the concentration of alkali residues as a standard, the concentration of the alkali residues is controlled to be within a process interval, and then the alkali residues are modified by adding a chemical conditioner, so that the alkali residues meet related environmental protection indexes and reach the class I general industrial solid waste standard; and the diluted alkali residues are mechanically dehydrated to obtain alkali residues subjected to stable dehydration treatment, and meanwhile, the alkali residue clear liquid is recycled for diluting the alkali residue slurry. The concentration of the alkali residue slurry is used as the standard of the dilution degree of the alkali residue slurry, so that the generation of the alkaline residue slurry in the dilution process is effectively reduced, the effect of conditioning the alkali residues by a chemical conditioner is exerted to the maximum extent, the waste of the chemical conditioner and water is avoided, and the treatment cost of dehydrating the alkali residues by an ammonia-alkali process is saved.

Description

technical field [0001] The invention relates to the field of industrial solid waste treatment, in particular to a treatment process for stably dehydrating alkali slag from ammonia-soda process. Background technique [0002] Ammonia-soda soda slag is a waste in the process of soda production. The ammonia-soda soda production in my country can reach 4.21 million t / year. Due to the characteristics of the ammonia-soda soda ash production process, 0.3t of industrial soda slag will be produced for every 1t of soda ash produced. At the same time Outer row 10m 3 A factory with an annual output of 800,000 tons of soda ash requires about 10 million yuan for waste residue discharge. The problem of disposal of these wastes has always plagued soda-making enterprises. The direct discharge of industrial alkali slag into rivers and seas will definitely cause great pollution to the environment, so most of them are stored in the form of dams, and the long-term accumulation forms alkali slag l...

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Problems solved by technology

[0008] In the Chinese patent CN201610672955, a production process of soda waste slag-free bricks is disclosed. The use of soda slag to prepare engineering bricks also needs to consider the dehydration problem. It not only needs to use vacuum and drying to remove the moisture in the soda slag, but also because of the The resulting bricks have a loose structure and poor cohesion, and must be mixed with fly ash, gravel, cement, etc., and the cost is also high

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