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Circulating green production method for salt, alkali and calcium on and underneath ground

A technology of green production and calcium circulation, applied in chemical instruments and methods, alkali metal chlorides, alkali metal compounds, etc., can solve the problems of wastewater discharge pollution and achieve the effect of improving the recovery rate

Pending Publication Date: 2020-05-08
JIANGXI JINGHAO SALINIZATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: aiming at the defects and deficiencies in the recovery and utilization of sodium chloride and calcium chloride in the soda making waste liquid of the prior art, a kind of ground underground salt, alkali, calcium circulation green production method is provided, the method The calcium chloride in the ammonia-alkali waste liquid and the sodium sulfate and glauberite in the thenardite-type rock salt resources are treated on the ground in stages, while the waste resources are rationally used, and all the Ca 2+ 、C l - , SO 4 2- 、Na + Recycling of resources, such as recycling, not only solves the pollution problem of traditional ammonia-alkali process wastewater discharge, but also realizes the recycling of resources and green production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] S1. Preparation of ammonia-alkali waste liquid: the waste liquid produced by the ammonia-alkali method in the soda ash industry is settled to obtain the upper clarified liquid. After testing, the upper clarified liquid contains 55.52g / L (0.95mol / L) Sodium chloride and 138.75g / L (1.25mol / L) calcium chloride.

[0029] S2. Extraction of high-nitrate brine: Inject the waste liquid into the abandoned well with high content of Glauber's salt, extract high-nitrate brine, and detect various concentration indicators. After testing, the NaCl content in this batch of high-nitrate brine is 210g / L, and NaCl is 210g / L. 2 SO 4 is 67g / L, namely Na + The molar concentration is 4.06mol / L, SO 4 2- The molar concentration is 0.47mol / L, Cl - The molar concentration is 3.59mol / L; the abandoned well refers to a mine with low sodium chloride grade, which is useless for salt production, and the S2 step of the present invention can reuse the sodium sulfate resource abandoned in the deposit o...

Embodiment 2

[0035] S1, preparation of ammonia-soda waste liquid: the waste liquid produced by the ammonia-alkali method in the soda ash industry is fully settled in the sedimentation tank to obtain the upper clarified liquid, which contains 41.49g / L ( 0.71mol / L) of sodium chloride and 84.36g / L (0.76mol / L) of calcium chloride.

[0036] S2. Extraction of high-nitrate brine: Inject salt-making flood water into Glauber's salt-type rock brine wells to extract high-nitrate brine, and detect various concentration indicators. After testing, the NaCl content in this batch of high-nitrate brine is 217g / L, and NaCl is 217g / L. 2 SO 4 is 62g / L, namely Na + The molar concentration is 4.17mol / L, SO 4 2- The molar concentration is 0.437mol / L, Cl - The molar concentration is 3.71mol / L;

[0037] S3. Precipitation reaction: according to the detection concentration, according to the SO contained in the high-nitrate brine 4 2- Ca contained in ammonia-soda waste liquid 2+ Molar ratio 1:1.02 ratio, at 1...

Embodiment 3

[0042] S1, preparation of ammonia alkali waste liquid: same as embodiment 2. That is to say, the waste liquid produced by the ammonia-soda method in the soda ash industry will be settled to obtain the supernatant liquid. After testing, the supernatant liquid contains 41.49g / L (0.71mol / L) of sodium chloride and 84.36g / L (0.76mol / L) of calcium chloride.

[0043] S2, extracting high-nitrate brine: same as embodiment 1. That is to inject the waste liquid into the waste well with high content of Glauber's salt, extract high-nitrate brine, and test various concentration indicators. After testing, the NaCl content in this batch of high-nitrate brine is 210g / L, and NaCl is 210g / L. 2 SO 4 is 67g / L, namely Na + The molar concentration is 4.06mol / L, SO 4 2- The molar concentration is 0.47mol / L, Cl - The molar concentration is 3.59mol / L; the abandoned well refers to a mine with low sodium chloride grade, which is useless for salt production, and the S2 step of the present invention ...

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Abstract

The invention relates to the technical field of salt chemical engineering resource recycling, and particularly discloses a circulating green production method for salt, alkali and calcium on and underneath the ground. According to the method, calcium chloride in ammonia-alkali waste liquid and sodium sulfate and glauberite in a mirabilite type rock salt resource are mixed; waste liquid is treatedon the ground in stages, meanwhile, waste resources are reasonably utilized, and all resources such as Ca<2+>, Cl<->, SO4<2-> and Na<+> are recycled; and the problem of pollution caused by discharge of wastewater from a traditional ammonia-alkali process is solved, and cyclic utilization and green production of the resources are achieved.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of salt chemical resources, and in particular relates to a green production method for ground and underground salt, alkali and calcium circulation. Background technique [0002] Soda ash is widely used in our life, such as building materials, light industry, chemical industry, metallurgy, textile and other industrial sectors and people's daily life, it can be called the "mother of chemical industry". The ammonia-soda method in the soda ash industry has many advantages, such as cheap raw materials, high product purity, by-product ammonia and carbon dioxide can be recycled, simple manufacturing steps, and suitable for large-scale production. However, there are disadvantages such as low utilization rate of NaCl, generation of calcium chloride with little use, and a large amount of production waste liquid at the same time. [0003] In the early stage, the waste liquid from ammonia-so...

Claims

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Application Information

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IPC IPC(8): C01F11/46C01D7/00C01D3/08
CPCC01F11/46C01D7/00C01D3/08
Inventor 万李胡景邱常义
Owner JIANGXI JINGHAO SALINIZATION
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