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Method for preparing gypsum by removing sulfate radicals from mineral salts with waste distillation liquid from ammonia alkali factory

An ammonia-alkali plant and sulfate technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve problems such as pollution, and achieve the effect of simple process, obvious energy saving and emission reduction effect, and good whiteness.

Active Publication Date: 2013-06-19
GUANGDONG NANFANG SODA ASH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this requires a large area of ​​slag yard and also causes serious pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) The 3m3 / h ammonia-soda plant distillation waste liquid is settled and separated from the suspended solids in the first-stage settler to obtain a clear waste liquid, and the turbidity of the clear waste liquid is ≤200ppm;

[0036] 2) Mix the clear waste liquid with 30m3 / h of nitrate-containing brine, and fully react in the batch reactor of the primary reactor for 30-40 minutes;

[0037] 3) Transfer the mixed liquid in step 2) into the batch tank of the secondary reactor, and add 1‰ of the mass of the mixed liquid into the batch tank of the secondary reactor at the same time, add the sedimentation and scale inhibitor sodium polyacrylate to fully react for 20- 30 minutes;

[0038] 4) The mixed liquid in the secondary reactor is transported to the secondary settler, settled and separated, and the supernatant is recovered. The gypsum slurry flowing out of the bottom of the settler is transported to the primary dehydration equipment belt filter, and fully dehydrated to obt...

Embodiment 2

[0043] 1) The 4m3 / h ammonia-soda plant distillation waste liquid is settled and separated from the suspended solids in the first-stage settler to obtain a clear waste liquid. The turbidity of the clear waste liquid is ≤200ppm;

[0044] 2) Mix the clear waste liquid with 50m3 / h of nitrate-containing brine, and fully react in the batch reactor of the primary reactor for 30-40 minutes;

[0045] 3) Transfer the mixed liquid in step 2) into the batch tank of the secondary reactor, and add 2‰ of the mass of the mixed liquid into the batch tank of the secondary reactor at the same time, add the sedimentation and scale inhibitor sodium polyacrylate to fully react for 20- 30 minutes;

[0046] 4) The mixed liquid in the secondary reactor is transported to the secondary settler, settled and separated, and the supernatant is recovered. The gypsum slurry flowing out of the bottom of the settler is transported to the primary dehydration equipment belt filter, and fully dehydrated to obtain ...

Embodiment 3

[0051] 1) Separating the 5m3 / h ammonia-soda plant distillation waste liquid through a primary settler to separate the suspended solids in it to obtain a clear waste liquid, the turbidity of the clear waste liquid is ≤200ppm;

[0052] 2) Mix the clear waste liquid with 40m3 / h of nitrate-containing brine, and fully react in the batch reactor of the primary reactor for 30-40 minutes;

[0053] 3) Transfer the mixed liquid in step 2) into the batch tank of the secondary reactor, and add 1.5‰ of the weight of the mixed liquid into the batch tank of the secondary reactor at the same time, add the sedimentation and scale inhibitor sodium polyacrylate to fully react for 20- 30 minutes;

[0054] 4) The mixed liquid in the secondary reactor is transported into the secondary settler, settled and separated, and the supernatant is recovered. The gypsum slurry flowing out of the bottom of the settler is transported to the dehydrator decanter centrifuge of the primary dehydration equipment, a...

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PUM

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Abstract

The invention discloses a method for preparing gypsum by removing sulfate radicals from mineral salts with a waste distillation liquid from an ammonia alkali factory, which comprises the following steps of: (1) precipitating and separating solid suspended matters in the waste distillation liquid from the ammonia alkali factory through a primary precipitator to obtain a clear waste liquid; (2) mixing the clear waste liquid with saltpeter-containing mineral salt brine to fully react in a primary reactor; (3) conveying the mixed liquid in the step (2) into a secondary reactor, and simultaneouslyadding a precipitating-aid and antisludging agent into the secondary reactor to fully react; (4) conveying the mixed liquid in the secondary reactor into a secondary precipitator to precipitate and separate, recovering the supernatant, conveying gypsum slurry flowing out from the bottom of the precipitator to a primary dewatering device, and fully dewatering the gypsum slurry to obtain coarse gypsum; and (5) conveying the dewatered coarse gypsum into a slurry compounding barrel, adding water to prepare slurry, continuing conveying the slurry to a secondary dewatering device, and fully dewatering the slurry to obtain the gypsum product. The method provided by the invention is simple, has low production cost and is extremely applicable to popularization and application.

Description

technical field [0001] The invention relates to a method for preparing gypsum by using distillation waste liquid of an ammonia-soda plant to remove sulfate radicals in mineral salt. Background technique [0002] Crude salt is the main raw material for soda ash production, and its basic sources include sea salt, lake salt and mineral salt. Using well drilling to mine salt to obtain brine is the main way for many soda ash enterprises to produce. Mining brine contains a lot of impurities, mainly sodium sulfate (commonly known as Glauber's salt). In order to obtain relatively pure production brine, some enterprises use the method of freezing and extracting sodium sulfate to extract sodium sulfate, which is used as a by-product for glass, bleaching and dyeing and other industries. When the content of sodium sulfate in the brine is not high (≤30g / l), due to energy consumption, complex process, high cost and other reasons, it is not feasible to use freezing to extract nitrate. If...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46
Inventor 黄志红杨建新周剑华曾松峰陈东成叶平
Owner GUANGDONG NANFANG SODA ASH IND