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Method for producing calcium chloride solution from alkali waste residues produced by ammonia-alkali process

A technology of calcium chloride solution and alkali-making waste residue, applied in chemical instruments and methods, separation methods, calcium/strontium/barium chloride and other directions, can solve the problems of low consumption of alkali residue, high utilization cost and high steam consumption, Achieve the effect of reducing steam consumption and reducing emissions

Active Publication Date: 2022-03-11
SHANDONG HAIHUA GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned treatment method consumes less alkali slag and has higher utilization cost and poor economic efficiency.
[0003] The common way to produce calcium chloride by acid method is to use hydrochloric acid and limestone or other calcium-containing raw materials to react to produce calcium chloride. Because the concentration of hydrochloric acid is up to 31%, the concentration of calcium chloride produced by this method is 15-25%. Higher steam consumption during re-evaporation, concentration and crystallization to produce solid calcium chloride
[0004] The hydrogen chloride gas produced in the chemical production process, especially the chlor-alkali hydrogen chloride synthesis process and the Mannheim method potassium sulfate production process, is absorbed by water to produce hydrochloric acid, and the added value of the product is low

Method used

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  • Method for producing calcium chloride solution from alkali waste residues produced by ammonia-alkali process

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Embodiment 1

[0024] refer to figure 1 , the device adopted in the present invention includes a crusher, a slurry tank, a reactor I, a reactor II, a clarifier, an immersion filter, a residue collection tank, a solid-liquid separator, a tail gas purification device, a storage tank, and a reactor I. The structure of reactor II, submerged filter, residue collection tank, solid-liquid separator and tail gas purification device is a known technology. The specific connection method is:

[0025] The crusher is connected to the slurry tank. After the slurry tank, the slurry pipeline is divided into two routes. The first route is connected to the reactor I slurry inlet through the first pipeline 01, and the second route is connected to the reactor II slurry through the second pipeline 02. The inlet; the bottom of the reactor I is equipped with a discharge pump, that is, a feed liquid forced circulation pump. After the circulation pump, the slurry pipeline is divided into two routes, the first route...

Embodiment 2

[0035] Embodiment 2 is basically the same as Embodiment 1, the main difference is:

[0036] Hydrogen chloride gas comes from the production process of potassium sulfate by Mannheim method; the bottom of reactor II is equipped with multi-layer rakes for stirring to strengthen and optimize the discharge of slurry at the bottom; The slurry is used for solid-liquid separation; the exhaust gas purification part and the two-stage exhaust gas absorption tower are respectively equipped with independent circulation pumps to optimize and adjust the concentration of hydrochloric acid after absorption; Filtration, control pressure -0.01~-0.1MPa, filtration temperature 40~80℃, flow control at 50~150 L / m 2 .h, when the membrane flux is lower than 50 L / m 2 .h or regularly use dilute hydrochloric acid backwash from the exhaust gas purification device, and use 0.5-1mol / L HCl chemical cleaning when the backwash of the submerged flat membrane cannot restore the flux. The material of the submerg...

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Abstract

The invention discloses a method for producing a calcium chloride solution by using alkali production waste residues in an ammonia-alkali process, hydrogen chloride gas and the alkali production waste residues in ammonia-alkali process sodium carbonate production are used as raw materials, the calcium chloride solution is prepared through crushing / grinding size mixing and reaction in a two-stage reactor, and the concentration of the prepared calcium chloride solution can reach more than 50%. The content of magnesium ions and sulfate ions is greatly reduced, the steam consumption is greatly reduced when solid calcium chloride is produced through subsequent evaporation, concentration and crystallization, and meanwhile, the discharge amount of solid alkaline residues is reduced.

Description

technical field [0001] The invention relates to a method for producing calcium chloride by utilizing the waste residue of the alkali-making process in an ammonia-soda process, in particular a method for producing a high-concentration calcium chloride solution, and belongs to the field of comprehensive utilization of the waste residue of the alkali-making process. Background technique [0002] A large amount of industrial waste soda slag is produced in the industrial production of soda ash by ammonia-soda method. The main components are calcium hydroxide, calcium chloride, calcium carbonate, magnesium hydroxide, silicon dioxide and clay, which are difficult to reuse. With the rapid development of the soda industry, a large amount of soda slag can only be piled up on the surface or discharged into the ocean. In recent years, in order to reduce the impact of waste alkali residue on the ecological environment, the treatment and reuse of alkali residue has become a research hotsp...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/68B01D53/73B01D53/96C01F11/28
CPCB01D53/80B01D53/68B01D53/73B01D53/96C01F11/28B01D2251/404B01D2251/402B01D2251/604B01D2251/606B01D2258/02
Inventor 夏金方刘建路朱荣振何金梁张浩波张涛孟祥海王传伟国钦瑞
Owner SHANDONG HAIHUA GRP CO LTD
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