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Production method of calcium chloride snow melting agent

A production method and calcium chloride technology, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve problems such as land erosion, easy leakage and polluted road surface

Inactive Publication Date: 2007-10-03
SHENYANG CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accumulation of carbide slag occupies a large amount of land, and long-term accumulation will cause serious land erosion. Moreover, the moisture content of carbide slag is more than 50%, which is paste-like, and it is easy to leak and pollute the road surface during transportation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw materials used in this example are carbide slag and hydrochloric acid. Carbide slag is waste from the production of polyvinyl chloride products. The hydrochloric acid used is synthetic hydrochloric acid (main chemical product) and by-product hydrochloric acid. The purpose of using the two acids is to compare product quality. By analyzing and comparing the calcium chloride content of the reaction products, it is determined that the calcium chloride content is above 97%, and there is little difference in product quality. Moreover, synthetic hydrochloric acid is one of the main products of our company, and the sales price is more than 900 yuan / ton. Therefore, it is not advisable to use synthetic hydrochloric acid to prepare calcium chloride deicing agent, and the by-product hydrochloric acid can only be used as a product because it is not sold as a product. When the waste acid is needed by the user, it will be disposed of at a low price, and if it cannot be dispose...

Embodiment 2

[0033]Taking the sample data of the third batch of experiment 2 in Table 2 as an example, take 500ml of by-product hydrochloric acid with an HCL content of 27.41%, and carry out neutralization reaction with 293g of carbide slag with an excess of 20% after theoretical calculation, and the obtained carbide slag slurry after the reaction After vacuum filtration, 410ml and 530g of clear liquid were obtained. After analysis of the clear liquid, the calcium chloride content is 30.40%, and the freezing point of the liquid calcium chloride of this concentration is about -40° C. through consulting the chemical product manual. It can be used as a deicing agent, which can save steam energy consumed by evaporation, and is an ideal energy-saving product. Since the content of calcium chloride in the liquid calcium chloride deicing agent is 30.40%, which is one-third of the content of solid calcium chloride, it is estimated that its profit is 150-200 yuan / ton. As shown in Table 4.

[0034]...

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Abstract

A process for preparing the calcium chloride as snowmelt agent with low environmental pollution includes such steps as loading the hydrochloric acid as a by-product into a reactor with stirrer, continuous stirring while slowly adding the rejected calcium carbide dregs containing calcium hydroxide, reacting while stirring until pH=7-8, vacuum filtering, taking clear liquid, evaporating, and drying.

Description

technical field [0001] The invention relates to the technical field of calcium chloride deicing agent, in particular to a production method of calcium chloride deicing agent which uses waste calcium carbide slag and by-product hydrochloric acid to be reacted to produce calcium chloride deicing agent. Background technique [0002] While producing caustic soda in chlor-alkali enterprises, chlorine and hydrogen are produced. Chlorine gas is the main raw material of chemical products, and polyvinyl chloride products are the best products for chlorine-alkali enterprises to balance chlorine gas, and their products have a wide range of uses. And utilize microsuspension method to produce polyvinyl chloride paste resin, the raw material that adopts is calcium carbide (CaC 2 ), calcium carbide reacts with water to generate acetylene gas, and the rest of the products contain Ca(OH) 2 The calcium carbide slag, its reaction equation is: [0003] CaC 2 +2H 2 O→C 2 h 2 ↑+Ca(OH) 2 ↓...

Claims

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Application Information

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IPC IPC(8): C01F11/24
Inventor 张素环刘国桢杨海堃黄海涛李健
Owner SHENYANG CHEM IND CO LTD
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