Salt, alkali and calcium combined cycle production technology by the use of well mineral salt

A technology of combined cycle and mine salt, which is applied in the direction of carbonate preparations, alkali metal chlorides, calcium/strontium/barium halides, etc., can solve problems such as low mining efficiency, waste of resources, and difficulty in industrialized production. Achieve the effect of maximizing comprehensive utilization, reducing waste discharge, and suppressing geological disasters

Active Publication Date: 2011-10-05
江苏苏盐井神股份有限公司 +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0011] But the disadvantages that exist are: 1, solid salt alkali production, raw material salt utilization rate is low, only 70%, production cost increases; waste of
However, the sulfate radical removal and calcium sulfate precipitation processes in the process of this method are all completed in underground mines. Due to the complicated underground conditions and large differ

Method used

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  • Salt, alkali and calcium combined cycle production technology by the use of well mineral salt
  • Salt, alkali and calcium combined cycle production technology by the use of well mineral salt
  • Salt, alkali and calcium combined cycle production technology by the use of well mineral salt

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Embodiment approach

[0062] According to a second embodiment of the present invention, there is provided:

[0063] 7. A combined cycle production process utilizing salt, alkali and optional calcium products of calcium sulphate type mine salt, which comprises the following steps:

[0064] 1), utilize ammonia soda method to prepare alkali (Na 2 CO 3 ), obtain solid sodium carbonate, produce ammonia-soda waste liquid and ammonia-soda waste residue simultaneously,

[0065] 2) The waste liquid from the above steps replaces fresh water and is injected into the calcium sulfate type salt mine to mine brine to obtain high-calcium brine, and at the same time, a salt cavity is left underground.

[0066] 3), the high-calcium brine of the above step 2) is vacuum evaporated, resulting in crystallization, obtaining solid sodium chloride and calcium chloride dihydrate, and optional liquid calcium products,

[0067] 4), inject the waste residue produced in the above step 1) into the underground salt cavity form...

Embodiment 1

[0085] Explanation: It is sodium sulfate type well mine salt. In this embodiment, the production of liquid calcium and liquid salt products, and other uses of low-nitrate brine are not considered.

[0086] Alkali production from brine (Na 2 CO 3 ), that is: use brine (salt water), limestone (calcined to generate quicklime and carbon dioxide), and ammonia as raw materials to produce soda ash. First pass ammonia gas into saturated brine to form ammonia brine, then pass through carbon dioxide to generate sodium bicarbonate precipitate and ammonium chloride solution with low solubility; then filter and wash NaHCO 3 Tiny crystals are heated and calcined to produce soda ash products, and the carbon dioxide gas released during the process can be recycled and recycled; then the filtrate containing ammonium chloride is mixed with milk of lime [Ca(OH)2] and heated, and the released ammonia gas can be recycled recycle. Prepare alkali with 5L of low-nitrate brine and other raw material...

Embodiment 2

[0093] Explanation: It is a sodium sulfate type well mine salt. In this embodiment, it is considered to produce liquid calcium, liquid salt products, and other uses of low-nitrate brine.

[0094] Alkali production from brine (Na 2 CO 3 ), that is: use brine (salt water), limestone (calcined to generate quicklime and carbon dioxide), and ammonia as raw materials to produce soda ash. First pass ammonia gas into saturated brine to form ammonia brine, then pass through carbon dioxide to generate sodium bicarbonate precipitate and ammonium chloride solution with low solubility; then filter and wash NaHCO 3 Tiny crystals are heated and calcined to produce soda ash products, and the carbon dioxide gas released during the process can be recycled and recycled; then the filtrate containing ammonium chloride is mixed with milk of lime [Ca(OH)2] and heated, and the released ammonia gas can be recycled recycle. Prepare alkali with 5L of low-nitrate brine and other raw materials are suff...

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Abstract

The invention relates to a salt, alkali and calcium combined cycle production technology by the use of well mineral salt. Based on the exploitation of brine from well mineral salt, the salt, alkali and calcium combined cycle production technology by the use of well mineral salt is a cycle production technology, which focuses on the technology for making alkali from brine by the ammonia-soda process and takes account of the vacuum salt-making (including the brine refinement) and calcium-making technologies. Alkali-making wastewater replaces most fresh water to be injected into a salt mine well to collect brine, and the obtained high-calcium brine is taken as the raw material of the salt and calcium (including liquid calcium) co-production as well as the raw material for preparing alkali and other chemical production raw materials, wherein the liquid calcium can be used to produce liquid salt; alkali-making waste residues are injected into an underground dissolution cavern, namely a salt cavern which is formed by the exploitation of brine from well mineral salt, thus accomplishing the combined cycle production technology in which alkali-making and salt-making technologies are closely related with materials. The produced wastes are used as resources or undergo a harmless treatment, thus protecting the environment. In addition, the utilization rate of sodium chloride in rock salt reaches 100%, achieving maximum efficiency.

Description

technical field [0001] The present invention relates to a combined cycle production process utilizing well mine salt as a feedstock to produce salt, alkali and optionally calcium products. More specifically, the present invention provides a cycle production process based on mining brine from wells and mines, taking the brine soda production process by the ammonia-soda method as the main body, and taking into account vacuum salt production (including refining of brine), calcium production, etc., wherein : Replace fresh water with ammonia-alkali waste liquid, inject it into salt mine to mine brine, and obtain high-calcium (containing liquid calcium) brine, as the raw material for salt-calcium co-production, and the raw material for preparing alkali or other chemical production raw materials, wherein liquid calcium can be used It is used for the production of liquid salt; while the soda-making waste slag is injected into the underground solution chamber or salt chamber formed by ...

Claims

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Application Information

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IPC IPC(8): C01D7/18C01D3/06C01F11/24
Inventor 刘正友蒋海斌张文广
Owner 江苏苏盐井神股份有限公司
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