Method for preparing soda ash by converting sodium sulfate in low-grade rock salt or glauber salt ores

A low-grade, sodium sulfate technology, applied in carbonate preparations, calcium/strontium/barium sulfate, etc., can solve problems such as environmental pollution, distillation waste liquid, waste residue need to be discharged, and calcium chloride market capacity is limited.

Active Publication Date: 2014-04-30
江苏苏盐井神股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantages are: 1. Solid salt alkali production, low utilization rate of raw salt, increased production cost; 2. A large amount of distillation waste liquid and waste residue need to be discharged, polluting the environment
[0018] However, this combined cycle production process needs to produce a large amount of calcium chloride by-product, and the market capacity of calcium chloride is limited (the national total is less than 2 million tons), so the promotion and application of this process is subject to certain restrictions
[0019] In the past, large amounts of calcium chloride by-products have plagued the soda and salt industries due to the limited market and high disposal costs

Method used

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  • Method for preparing soda ash by converting sodium sulfate in low-grade rock salt or glauber salt ores
  • Method for preparing soda ash by converting sodium sulfate in low-grade rock salt or glauber salt ores
  • Method for preparing soda ash by converting sodium sulfate in low-grade rock salt or glauber salt ores

Examples

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Comparison scheme
Effect test

Embodiment 1

[0094] Example 1: Low-grade rock salt mineral resources, the output of soda ash is 600,000 t / year, and about 3 million m3 of low-nitrate brine is needed 3 / year as raw material, will produce 5.4 million m 3 192,000 tons of soda-making waste liquid and 192,000 tons of soda-making waste residue.

[0095] 5.4 million m 3 Because the content of calcium chloride is higher than that of sodium sulfate, it needs to be diluted with water and then injected into the well to extract brine. The dissolution chamber is utilized in equipment, and calcium chloride and sodium sulfate react and clarify in the dissolution chamber. According to calculations, the amount of water added is 8.43 million cubic meters of fresh water, and 725,000 tons of sodium sulfate in low-grade rock salt resources is converted into sodium chloride, and 695,000 tons of calcium sulfate is generated, which settles to the bottom of the cave in the underground cavern. If the take-bet ratio is 0.9, you will get 12.45 mi...

Embodiment 2

[0098] Example 2: Low-grade Glauber's salt mineral resources 1), the output of soda ash is 600,000 t / year, and about 3 million m3 of low-nitrate brine is required 3 / year as raw material, will produce 5.4 million m 3 192,000 tons of soda-making waste liquid and 192,000 tons of soda-making waste residue.

[0099] 5.4 million m 3 Because the content of calcium chloride is lower than that of sodium sulfate, it needs to be concentrated and injected into the well to extract brine. The dissolution chamber is utilized in equipment, and calcium chloride and sodium sulfate react and clarify in the dissolution chamber. After calculation, it needs to be concentrated to CaCl 2The content is about 140.2g / L, and the concentrated quantity is 4.04 million cubic meters. Among the low-grade rock salt resources, 725,000 tons of sodium sulfate is converted into sodium chloride, and 695,000 tons of calcium sulfate is produced, which settles to the bottom of the cavern. If the take-bet ratio is...

Embodiment 3

[0103] Example 3: Low-grade Glauber's salt mineral resource 2), the output of soda ash is 600,000 t / year, and about 3 million m of low-nitrate brine is needed 3 / year as raw material, will produce 5.4 million m 3 192,000 tons of soda-making waste liquid and 192,000 tons of soda-making waste residue.

[0104] 5.4 million m 3 The alkali-making waste liquid is directly injected into the well to extract brine because the content of calcium chloride is equivalent to the content of sodium sulfate. The dissolution chamber is utilized in equipment, and calcium chloride and sodium sulfate react and clarify in the dissolution chamber. According to calculations, 725,000 tons of sodium sulfate in the low-grade rock salt resources was converted into sodium chloride, and 695,000 tons of calcium sulfate was generated, which settled down to the bottom of the cave in the underground cavern. Take note ratio 0.9, get 4.86 million m 3 Low-nitrate brine, the average sodium sulfate content in t...

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Abstract

The invention discloses a method for mining low-grade rock salt ores and/or low-grade glauber salt ores by utilizing an alkali production waste liquor byproduct of an ammonia-alkali process and converting sodium sulfate in the ores into sodium chloride for alkali production. The method comprises the following steps of injecting the alkali production waste liquor into an underground cavity of the ores, performing chemical reaction on calcium chloride in the alkali production waste liquor and the sodium sulfate in the low-grade rock salt ores and/or the low-grade glauber salt ores to convert the sodium sulfate into sodium chloride required by alkali production, and mining the sodium chloride as brine for alkali production, precipitating and storing calcium sulfate generated by the reaction in the underground cavity, wherein the low-grade rock salt ores are low-grade rock salt ore resources abandoned by the salt and glauber salt co-production process, and every liter of brine mined by injecting fresh water into a mine of the ores contains 30 to 100 grams of Na2SO4 and 290 to 220 grams of NaCl; the low-grade glauber salt ores are low-grade glauber salt ore resources abandoned by the salt and glauber salt co-production process, and every liter of aqueous glauber salt mined by injecting the fresh water into a mine of the ores contains 200 to 100 grams of Na2SO4 and 120 to 220 grams of NaCl; every liter of alkali production waste liquor contains 95 to 115 grams of CaCl2 and 45 to 56 grams of NaCl.

Description

technical field [0001] The invention belongs to the technical field of chemical industry such as mining, salt making, alkali making industry and the like. More specifically, the present invention relates to a process for the production of soda ash by conversion of sodium sulfate from low-grade rock salt or low-grade thenardite deposits. Background technique [0002] First of all, salt (NaCl) is a necessary product in the daily life of ordinary people, and it is also a basic raw material for the chemical industry such as two alkalis. The production of salt is mainly divided into sea salt and well mine salt. In recent years, due to the requisition of a large amount of sea salt tidal flat resources, sea salt production has been shrinking, while the well mine salt industry has developed rapidly with the continuous discovery of rock salt resources. It has surpassed sea salt, accounting for nearly 50% of the total national salt production. my country's well mine salt production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/18C01F11/46
Inventor 张文广刘正友蒋海斌
Owner 江苏苏盐井神股份有限公司
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