Method for producing industrial grade calcium chloride by taking calcium carbide slurry as raw material

A technology of calcium carbide mud and calcium chloride, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problem of reducing the value of recycling calcium carbide mud and by-product hydrochloric acid, the difficulty of solid-liquid separation, Problems such as low equipment utilization rate, to achieve the effect of significant environmental protection benefits, short process flow and low consumption quota

Inactive Publication Date: 2013-02-06
荣殿相
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

This not only reduces the recycling value of calcium carbide sludge and by-product hydrochloric acid, but also causes serious pollution to the environment
[0003] In the existing method for producing calcium chloride, the pH value of the material is adjusted to about 12 with milk of lime, and iron and magnesium are removed in the form of ferric hydroxide and magnesium hydroxide, and both ferric hydroxide and magnesium hydroxide are It is colloid, solid-liquid separation is difficult, consumes more lime milk, produces more secondary waste residue, low equipment utilization rate, long process and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] First open the tail gas outlet valve, and under stirring conditions, add 106 liters of by-product hydrochloric acid with a concentration of 25.10% and 47 kg of calcium carbide mud into the reactor and mix them. °C, the pH value is 0.5, and a crude calcium chloride solution is obtained. Then add 3.7 kg of bleaching powder, after 25 minutes of oxidation-reduction reaction, when the reaction is complete, the pH value is 1.5. Finally, 5 kg of NP waste residue was added, heated to 100°C with a jacket after reacting for 20 minutes, and kept at a constant temperature for 40 minutes. The light calcium carbonate in the NP waste residue had been completely decomposed by waste hydrochloric acid, and iron phosphate octahydrate and ammonium magnesium phosphate hexahydrate had precipitated completely. Phase pH is 6.5, stop heating, start discharging. After sedimentation, coarse filtration and fine filtration, refined calcium chloride solution is obtained. The refined calcium chlori...

Embodiment 2

[0056] First open the tail gas outlet valve, and under stirring conditions, add 110 liters of by-product hydrochloric acid with a concentration of 25.8% and 50 kg of calcium carbide mud into the reactor for mixing, and the reaction of neutralizing and decomposing calcium carbide mud at 20 min is fully completed, and the temperature of the slurry rises to 80 °C, the pH value is 1.0, and a crude calcium chloride solution is obtained. Then add 3.9 kg of bleaching powder, after 30 minutes of oxidation-reduction reaction, the temperature of the material is 73°C, and the pH value is 2.0. Finally, 5.5 kg of NP waste residue was added, and after 25 minutes of reaction, it was heated from the outside to 110°C and kept at a constant temperature for 30 minutes. The light calcium carbonate in the NP waste residue had been completely decomposed by waste hydrochloric acid, and iron phosphate octahydrate and ammonium magnesium phosphate hexahydrate had completely precipitated. PH is 6.0, sto...

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Abstract

The invention discloses a method for producing industrial grade calcium chloride by taking calcium carbide slurry as raw material, comprising the following steps: firstly, the calcium carbide slurry and hydrochloric acid are reacted to produce calcium chloride, secondly, Fe<2+> produced by oxidation-reduction reaction is oxidized into Fe<3+> by bleaching powder, H2S produced in the reaction is partially removed, and then calcium carbonate and ammonium phosphate in NP residues are reacted with free hydrochloric acid, FeCl3 and MgCl2 in the reaction completion solution to produce calcium chloride, iron phosphate octahydrate and magnesium phosphate hexahydrate, calcium chloride thin slurry is subjected to sedimentation, rough filtration and fine filtration, so fine calcium chloride solution is obtained, the fine calcium chloride solution is subjected to evaporative concentration and granulation drying, so granular calcium chloride product is prepared, and finally, ferrous chloride solution containing sodium hydroxide is adopted to absorb hydrogen sulfide in the tail gas, and the tail gas is enabled to reach the treatment standard. According to the method for producing industrial grade calcium chloride by taking calcium carbide slurry as the raw material, wastes are treated by using wastes, the wastes are turned into useful things, and the serious pollution problem caused by calcium carbide slurry and by-product hydrochloric acid is radically solved, the benefit of environmental protection is very remarkable, the technological process is short, the product quality is good, and the economic benefit is high.

Description

technical field [0001] The invention relates to the utilization technology of calcium carbide mud, in particular to a method for producing industrial-grade calcium chloride by using calcium carbide mud and by-product hydrochloric acid as raw materials. Background technique [0002] In the process of producing polyvinyl chloride by calcium carbide acetylene method, a large amount of calcium carbide mud and by-product hydrochloric acid are produced. The by-product hydrochloric acid has a low concentration and many impurities, especially ferrous ions and ferric ions. The market is extremely shrinking, and it is difficult to sell (including upside-down sales), and it is not allowed to discharge. Calcium carbide mud has complex components, the main component is calcium hydroxide, and it also contains ferrous oxide, burnt magnesium oxide and calcium oxide, trace amounts of calcium carbide and calcium sulfide, as well as acid insoluble matter and water. At present, the processing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/24
Inventor 荣殿相
Owner 荣殿相
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