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Method for preparing industrial calcium chloride from thiourea waste residues

A technology of industrial calcium chloride, thiourea waste residue, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., to achieve the effect of great economic value and environmental protection value

Inactive Publication Date: 2016-08-24
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many domestic calcium chloride manufacturers, there are less than 20 manufacturers with a production capacity of more than 50,000 tons / year

Method used

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  • Method for preparing industrial calcium chloride from thiourea waste residues
  • Method for preparing industrial calcium chloride from thiourea waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of method that is raw material production industrial grade calcium chloride with thiourea waste residue and industrial hydrochloric acid, its concrete steps are:

[0042] (1) Stir and wash the thiourea waste residue at 80° C. for 30 min with clear water having the same quality as the thiourea residue, and filter with suction to obtain waste residue with low thiourea content (0.1% thiourea content).

[0043] (2) Prepare a 25% concentration hydrochloric acid solution with carbon-containing waste slag primary washing water (clear water for the first batch of reaction) and industrial hydrochloric acid (hydrochloric acid concentration 35%).

[0044](3) Take by weighing 200g 25% concentration hydrochloric acid solution in the 500ml four-neck flask, stir, slowly add thiourea waste residue (thiourea content 0.1%) in the hydrochloric acid solution, the addition time is controlled at 1-1.5 hours, and the reaction is exothermic, The water bath temperature control is less th...

Embodiment 2

[0051] A kind of method that is raw material production industrial grade calcium chloride with thiourea waste residue and industrial hydrochloric acid, its concrete steps are:

[0052] (1) Use clean water with the same quality as the thiourea residue to stir and wash the thiourea residue at 70° C. for 30 minutes, and filter with suction to obtain waste residue with low thiourea content (0.2% thiourea content).

[0053] (2) Prepare a 30% concentration hydrochloric acid solution with carbon-containing waste slag primary washing water (clear water for the first batch of reaction) and industrial hydrochloric acid (hydrochloric acid concentration 35%).

[0054] (3) Take by weighing 200g 30% concentration hydrochloric acid solution in the 500ml four-neck flask, stir, slowly add thiourea waste residue (thiourea content 0.2%) in the hydrochloric acid solution, the time of adding is controlled at 1-1.5 hour, and reaction exotherm, The temperature of the water bath is less than 40°C.

...

Embodiment 3

[0061] A kind of method that is raw material production industrial grade calcium chloride with thiourea waste residue and industrial hydrochloric acid, its concrete steps are:

[0062] (1) Stir and wash the thiourea waste residue at 65° C. for 30 min with clear water of the same quality as the thiourea waste residue, and filter with suction to obtain waste residue with low thiourea content (0.3% thiourea content).

[0063] (2) Get industrial hydrochloric acid (hydrochloric acid concentration 35%).

[0064] (3) Take by weighing 200g 35% concentration hydrochloric acid solution in the 500ml four-neck flask, stir, slowly add thiourea waste residue (thiourea content 0.25%) in the hydrochloric acid solution, the addition time is controlled at 1-1.5 hours, and the water bath temperature control is less than 65°C.

[0065] (4) When the pH value of the reaction solution was 4.5, stop adding thiourea waste residue, continue to stir and react for 30 minutes, and then suction filter to ...

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Abstract

The invention discloses a method for producing industrial calcium chloride from raw materials including thiourea waste residues and technical hydrochloric acid. Calcium hydroxide in the thiourea waste residues and hydrochloric acid are subjected to an acid-base neutralization reaction, and industrial calcium chloride products are obtained. With the adoption of the method, the problem that industrial solid waste of thiourea is difficult to treat is solved, the production capacity of thiourea is no longer limited by the solid waste, the industrial calcium chloride products meeting market requirements are obtained, new three wastes are no longer generated, comprehensive utilization of the thiourea residues is realized, the industrial added value of thiourea is increased, and the method has greater economic value and environment protection value.

Description

technical field [0001] The invention relates to a method for preparing industrial calcium chloride by comprehensive utilization of thiourea waste residue. Background technique [0002] Thiourea is an important chemical raw material. The thiourea production plant produces a large amount of wet waste residue (mainly composed of calcium hydroxide) every year. Most of the waste residue cannot be reused, thus forming solid waste that cannot be treated, which directly affects the increase of thiourea production capacity. . [0003] If the thiourea waste residue can be reacted with industrial hydrochloric acid to prepare a certain value-added calcium chloride product, realize the comprehensive utilization of waste residue, and turn waste into treasure, it will have great environmental protection value. [0004] Calcium chloride (CaCl2) is an inorganic salt, a white crystal, with unique physical properties such as high solubility, strong hygroscopicity, and easy hydrolysis in the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/24
CPCC01F11/24
Inventor 张蒙刘鹏刘克锋龙显灵冯博洪刘莎
Owner CHAMBROAD CHEM IND RES INST CO LTD
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