Technology for recycling chlor-alkali salt mud

A technology of salt mud and chlor-alkali, which is applied in the field of chlor-alkali salt mud recycling technology, can solve the problems of secondary environmental pollution and occupying a large space, and achieve the effect of increasing porosity, particle size and adsorption degree

Inactive Publication Date: 2019-05-03
胡芳 +5
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Problems solved by technology

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Method used

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Embodiment 1

[0019] A method for recycling chlor-alkali salt mud, comprising the following steps: (1) adding 5-10 times the quality of water to the waste salt mud, beating with a beater at 80-100 rpm for 2 hours to prepare a slurry, and magnetically separating , filter with 300-400 mesh filter, and dry; (2) The dried salt mud is first calcined in a rotary furnace, the temperature of the rotary furnace is 850 ° C, the calcination time is 50 minutes, ground to 300-400 mesh, and then added with water to prepare into a 1:4 slurry; (3) in the salt mud slurry autoclave, add 30% sodium hydroxide solution, then add low-polymerization polyvinyl alcohol, the molecular weight of the low-polymerization polyvinyl alcohol is 2 -30,000, heat up to 200°C, react in a closed system for 2 hours, the addition of the sodium hydroxide is 0.3 times the mass of the salt mud slurry, and the addition of the low degree of polymerization polyvinyl alcohol is 0.15 times the salt mud slurry (4) above-mentioned solution...

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Abstract

The invention discloses a technology for recycling chlor-alkali salt mud, and belongs to the field of environmental protection. The method for recycling the chlor-alkali salt mud comprises the following steps: firstly, carrying out filtering, drying, and calcining, then carrying out hydrothermal modification by using a concentrated alkali and polyvinyl alcohol, carrying out airflow crushing, and then fully and uniformly carrying out mixing with citric acid, sodium persulfate, amylose and a plant fiber waste material, so as to obtain an improved soil composition. The improved soil composition disclosed by the invention is prepared by taking the waste chlor-alkali salt mud as a main material and can fully improve soil polluted by hydrocarbons and heavy metals.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a process technology for recycling chlor-alkali salt mud. Background technique [0002] Salt mud in the chlor-alkali industry is the pulpy discharge produced during the refining process of brine produced by caustic soda and soda ash. The clarified brine obtained after the brine is refined and separated is called refined brine, and the precipitated discharge is called salt mud. The produced salt mud mainly contains barium sulfate, calcium carbonate, magnesium hydroxide, soluble salt and other insoluble matter. At present, the industrial production of the two alkalis needs 15 million tons of industrial salt (calculated by 100% of sodium chloride) every year, and the salt mud discharged by the production of the two alkalis in the whole country reaches hundreds of thousands of tons in total like this. [0003] As society and enterprises pay more and more attention...

Claims

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Application Information

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IPC IPC(8): C09K17/40
Inventor 胡芳杨小钢刘腾飞邢娟娟孔长生冯立君冯立峰朱芬芬王福利高静潘景凤王果果刘永玲胡华斌郭子东
Owner 胡芳
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