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Production device utilizing salt cakes to produce refined brine and byproduct (dihydrate gypsum) and production method thereof

A technology of dihydrate gypsum and purified brine, applied in the direction of calcium/strontium/barium sulfate, alkali metal halide purification, etc., can solve the problem of increase of by-product salt mud, etc., and achieves beneficial modification, uniform crystal particles, and excellent performance. Effect

Pending Publication Date: 2018-04-10
TANGSHAN SANYOU CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using this technology for brine refining, a large amount of Ca 2+ with SO 4 2- Combined to form dihydrate gypsum and enter the primary salt mud, the by-product salt mud increases significantly

Method used

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  • Production device utilizing salt cakes to produce refined brine and byproduct (dihydrate gypsum) and production method thereof
  • Production device utilizing salt cakes to produce refined brine and byproduct (dihydrate gypsum) and production method thereof

Examples

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Effect test

Embodiment 1

[0022] A production device that utilizes Glauber's salt to refine brine and produce dihydrate gypsum as a by-product, see the attached figure, in the figure: 1-magnesium removal reactor, 2-baffle tank I, 3-magnesium removal clarification tank, 4-calcium removal reactor , 5-baffle tank II, 6-decalcification clarification tank, 7-primary brine buffer tank, 8-primary brine pump, 9-belt filter, 10-dihydrate gypsum slurry pump, 11-dihydrate gypsum slurry Buffer barrel, 12-magnesium removal coarse brine pump, 13-magnesium removal coarse brine buffer barrel, 14-primary salt mud buffer barrel, 15-primary salt mud pump.

[0023] The magnesium removal reactor 1 is connected to the baffle tank I2 through pipelines, the baffle tank I2 is connected to the magnesium removal clarification tank 3, and the bottoms of the magnesium removal reactor 1 and the magnesium removal clarification tank 3 are respectively connected to the primary salt mud buffer tank 14 through pipelines connection, the ...

Embodiment 2

[0032] Mg in crude brine 2+ : OH in milk of lime - The molar ratio of 1:2.16 is added to the magnesium removal reactor 1 with crude brine and milk of lime, and the magnesium removal reaction is carried out under stirring conditions. The Mg in the crude brine 2+ All with OH in milk of lime - combined into Mg(OH) 2 , at the same time, there is 10% molar ratio of Ca in the reaction solution 2+ with SO 4 2- combined into CaSO 4 .2H 2 O. Mg(OH) formed in Mg removal reactor 1 2 , CaSO 4 .2H 2 O, biological slime in crude brine and water-insoluble matter in milk of lime. Mg(OH) in primary salt mud composition 2 Accounting for 16% by mass, CaSO 4 .2H 2 O accounts for 14.5%, biological slime in crude brine and water-insoluble matter in milk of lime are other impurities accounting for 16.5%, and the moisture content is 52%.

[0033] A small part of the primary salt mud settles to the bottom of the magnesium removal reactor 1 and the solution after the reaction is dischar...

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Abstract

The invention relates to a brine refining technology, and specifically relates to a production device utilizing salt cakes to produce refined brine and a byproduct (dihydrate gypsum) and a productionmethod thereof. A magnesium removing reactor is connected to a buffering tank (I) through a pipeline; a calcium removing reactor is connected to a buffering tank (II) and a dihydrate gypsum slurry buffering barrel through pipelines; and a calcium removing clarifying barrel is connected to a primary brine buffering barrel and the dihydrate gypsum slurry buffering barrel through pipelines. Crude brine is added into the magnesium removing reactor; according to the amount of magnesium ions in the crude brine in the magnesium removing reactor, primary salt mud, which flows from the bottom of a magnesium removing clarifying barrel and the bottom of the magnesium removing reactor, is introduced into a primary salt mud buffering barrel; magnesium free crude brine from a magnesium free crude brinebuffering barrel is delivered to the calcium removing reactor by a magnesium free crude brine pump; low calcium clear liquid that overflows from the upper part of the calcium removing clarifying barrel is taken as primary brine, which is introduced to the primary brine buffering barrel, dihydrate gypsum slurry is pumped to a belt filter, and a dihydrate gypsum product is obtained after solid-liquid separation and washing. Due to the production of dihydrate gypsum, the byproduct (salt mud) is further reduced during the brine refining process.

Description

technical field [0001] The invention relates to a process for refining salt water, in particular to a production device and a production method for refining salt water by using Glauber's salt and producing dihydrate gypsum as a by-product. Background technique [0002] During the production of soda ash by the ammonia-soda method, it is necessary to use fresh water to dissolve the solid raw salt and remove the Ca in it. 2+ , Mg 2 + , prepared into refined brine. The traditional "lime-soda ash method" brine refining process requires a large amount of lime milk and soda ash, which is extremely expensive, and a large amount of salt mud containing calcium carbonate, magnesium hydroxide and dihydrate gypsum is produced by-product. The disposal of salt mud in the industry is basically that the salt mud enters the filter press to be squeezed into a cake, and the squeezed water enters the salt system to prepare a coarse brine, and the filter cake is stored for disposal. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/16C01D3/14C01F11/46
CPCC01D3/14C01D3/16C01F11/46
Inventor 张作功张体良王秉钧王秀忠吕晓英王同国云玉娥乔秀华孟祥瑜赵振旺张彪张润泽缪伟陈世辉梁宁飞刘超陈志勇崔小光谢秋利薄宝山韩园园安玉红
Owner TANGSHAN SANYOU CHEM IND
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