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Method for producing hydrochloric acid-liquid caustic soda-composite material by utilizing industrial waste impure salt

A composite material and industrial technology, applied in the field of solid waste treatment, can solve the problems of unacceptable, high purification and treatment costs, affecting product quality and downstream market acceptance and resource utilization, so as to reduce transportation costs, reduce concentration costs, and avoid two The effect of secondary pollution

Pending Publication Date: 2020-07-31
安徽科安废盐资源化有限公司
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Problems solved by technology

However, since the waste salt comes from various industrial fields, it may contain various concentrations of organic matter, calcium and magnesium ions, heavy metals and other impurities, which will affect the quality of the product, the acceptance of the downstream market and the utilization of resources.
In addition, the cost of various complex purification treatments for waste salt is very high, but the final product obtained is still low-value industrial salt, and the current technical process is economically unacceptable

Method used

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  • Method for producing hydrochloric acid-liquid caustic soda-composite material by utilizing industrial waste impure salt

Examples

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Embodiment 1

[0029] In this example, 100 kg of waste salt rich in organic matter from a certain enterprise was taken. XRD analysis results showed that the main phase composition was common salt: NaCl content 83.6%, organic matter content 14.7%, and other impurities 1.7%. The waste salt is processed through the following steps:

[0030] Step 1. Using natural gas as fuel, the waste salt is roasted in an indirect heating roaster under an oxygen-deficient atmosphere at 500°C to pyrolyze the organic and decomposable inorganic impurities; The salt is heat-exchanged and condensed, washed and absorbed by sodium hydroxide solution with a mass concentration of 5%, and finally filtered and purified before being used as fuel for indirect heating roasters.

[0031] Step 2. React the roasted product in the high-temperature converter at 320-350° C. for 10 minutes with concentrated sulfuric acid having a mass concentration of 98% in a mass ratio of 1.2:1 to obtain HCl and SO 2 The gaseous product, the re...

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Abstract

The invention discloses a method for producing a hydrochloric acid-liquid caustic soda-composite material by utilizing industrial waste impure salt. The method comprises the following steps: roastingthe industrial waste impure salt in a high-temperature oxygen-deficient atmosphere to decompose organic matters and easily-decomposed inorganic matter impurities in the industrial waste impure salt, reacting with concentrated sulfuric acid at high temperature to convert into hydrochloric acid, and dissolving, purifying and causticizing byproduct sodium sulfate with dolomite ash or lime to obtainliquid caustic soda and a composite material. According to the method disclosed by the invention, the industrial raw materials of hydrochloric acid and liquid caustic soda are obtained by taking the waste impure salt, the concentrated sulfuric acid, the dolomite ash or the lime as raw materials, so that closed cycle of wastewater and waste liquid is realized, pollution-free emission of waste gas is realized, and the recycling problem of the industrial waste impure salt containing organic matters is solved.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a method for recycling industrial waste salt or miscellaneous salt. Background technique [0002] With the increasingly stringent environmental protection management, zero discharge of wastewater and zero discharge of sensitive pollutants has become a common requirement for enterprises. Membrane separation and its high-salt concentrated liquid multi-effect evaporation crystallization process are widely used. In the end, enterprises or industrial parks will produce waste salt containing complex organic and inorganic substances, which is hazardous solid waste. Waste salt with complex components cannot be directly used as industrial raw material salt, let alone in the food or pharmaceutical industry, resulting in the lack of a way out for further resource utilization. Since industrial waste salt is easy to dissolve, improper disposal can easily affect the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C01F5/02C01B7/03C01D5/00C01D1/20C10B53/00
CPCC01F11/46C01F5/02C01B7/035C01D5/00C01D1/20C10B53/00
Inventor 陈赫然陈天虎汪家权
Owner 安徽科安废盐资源化有限公司
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