Anti-scaling method for calcium chloride production

A calcium chloride, anti-scaling technology, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc. Speed, the effect of extending the operating cycle

Inactive Publication Date: 2018-07-06
CHINA NAT OFFSHORE OIL CORP +1
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  • Claims
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Problems solved by technology

Because the raw material liquid used in this process is ammonia distilled waste liquid produced by ammonia-soda method soda ash, which contains a large amount of SO42-, resulting in calcium sulfate scaling on the inner wall of the evaporator heating tube during the evaporation and concentration process, which seriously reduces th

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  • Anti-scaling method for calcium chloride production

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Effect test

Embodiment 1

[0015] Reference figure 1 , This embodiment uses a five-effect evaporation system, including the following steps:

[0016] (1) The waste liquor of soda ash ammonia distillation containing 15% (wt) of calcium chloride and 9% (wt) of sodium chloride is used as the raw material liquid, and the two-effect evaporator is used as the first-effect evaporator to feed, and the intermediate material is obtained by evaporation and concentration Liquid (1), its composition includes: calcium chloride 21% (wt), sodium chloride 8% (wt), sodium chloride crystal 4.5% (wt), calcium sulfate crystal 0.015% (wt), and then through four effects Evaporator evaporates and concentrates to obtain intermediate feed liquid (2), its composition includes: calcium chloride 34% (wt), sodium chloride 3% (wt), sodium chloride crystal 18% (wt), calcium sulfate crystal 0.018% ( wt), and then enter the three-effect evaporator for evaporation and concentration to obtain the intermediate mother liquor of calcium salt. ...

Embodiment 2

[0020] Reference figure 1 , This embodiment uses a five-effect evaporation system, including the following steps:

[0021] (1) Use the soda ash ammonia distilled waste liquid containing 15.5% (wt) of calcium chloride and 8.5% (wt) of sodium chloride as the raw material liquid, and the two-effect evaporator is used as the first-effect evaporator to feed, and the intermediate material is obtained by evaporation and concentration Liquid (1), its composition includes: calcium chloride 22.5% (wt), sodium chloride 8.5% (wt), sodium chloride crystal 4.0% (wt), calcium sulfate crystal 0.015% (wt), and then through four effects The evaporator evaporates and concentrates to obtain the intermediate liquid (2), which consists of calcium chloride 35% (wt), sodium chloride 2.8% (wt), sodium chloride crystal 19.5% (wt), calcium sulfate crystal 0.015% ( wt), and then enter the three-effect evaporator for evaporation and concentration to obtain the intermediate mother liquor of calcium salt. Its...

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Abstract

The invention discloses an anti-scaling method for calcium chloride production. The method comprises the steps of taking soda distilled ammonia waste liquid with a calcium chloride concentration of not less than 15%(wt) as a raw material solution, performing evaporation and concentration on the raw material solution via a triple-effect evaporation device to form a salt calcium intermediate mothersolution with the calcium chloride concentration of 38-42%(wt), performing physical separation on the salt calcium intermediate mother solution to remove a byproduct, sodium chloride, then performingheat preservation and sedimentation to form a purer calcium solution and a calcium mother solution containing a calcium sulfate crystal, mixing and returning the calcium mother solution containing thecalcium sulfate crystal and the raw material solution to the above mentioned steps, conveying into a primary feeding evaporator after controlling the calcium chloride concentration to be greater than18%(wt), and performing the evaporation and concentration, sheeting and drying on the purer calcium solution obtained after the heat preservation and the sedimentation via a double-effect evaporationdevice to form a finished product, namely sheeted calcium chloride dihydrate. The method solves the problem of 2mm scaling after production for 30 days in the prior art, achieves an effect of scalingthickness not exceeding 0.5mm after continuous production operation for 105 days, lowers cleaning cost, improves device vaporization efficiency and greatly prolongs an operation cycle of the evaporators.

Description

Technical field [0001] The invention relates to a method for preventing scaling in the production of calcium chloride. Background technique [0002] At present, most of the domestic calcium chloride production processes are based on the ammonia-soda waste liquid produced in the soda production process of the ammonia-soda soda plant as the raw material, and the multi-effect vacuum evaporation device is the operating unit, and the chlorine is removed by multi-effect evaporation concentration and sedimentation separation. Sodium sulfide is used to obtain the evaporated liquid, and then the evaporated liquid is subjected to the production process of evaporative concentration and flake drying. The final product is dihydrate flake calcium chloride. The main production equipment is multiple forced circulation evaporators, and the efficient long-period continuous operation of the evaporator is the key to energy saving and consumption reduction in calcium chloride production. Because the...

Claims

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Application Information

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IPC IPC(8): C01F11/24
CPCC01F11/24
Inventor 刘华军冯敬之于丙胜袁庆智高新宝朱永智
Owner CHINA NAT OFFSHORE OIL CORP
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