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Method for producing liquid calcium chloride by using industry waste acid

A technology of industrial waste acid and calcium chloride, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc.

Inactive Publication Date: 2008-09-03
KUNMING IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the defects of traditional production technology, and solves the problems of particle size, proportioning, reaction speed control, filtration and purification of solution, and harmless discharge of gas after reaction in the production process.

Method used

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specific Embodiment approach

[0027] The present invention will be further elaborated below in conjunction with embodiment. However, the present invention is not limited thereto.

[0028] In the embodiment of the present invention, before production, it is necessary to check the limestone particle size and surface. The particle size should be less than 0.5cm. When the surface soil and impurities are more, it should be washed with water; it is necessary to carefully check whether the distribution box and the acid-resistant pump line meet the safety requirements. ; It is necessary to carefully check whether the acid inlet and exhaust pipes are airtight.

Embodiment 1

[0030] A kind of method utilizing industrial waste acid to produce liquid calcium chloride, the steps are as follows:

[0031] (1) 2400 kg of industrial waste hydrochloric acid with a particle size of less than 0.5 cm, CaO content greater than 40%, surface free of soil and impurities, and 2400 kg of industrial waste hydrochloric acid with a concentration of 21% are added to the reaction tank in batches for mixed reaction; limestone is added from the feed port, each time Add 100kg; hydrochloric acid is added in 4 times, 600kg is added each time, and the interval between each addition is 30 minutes, and the last batch of hydrochloric acid is added to the reaction tank and mixed for 1 hour to obtain a crude calcium chloride solution;

[0032] (2) adjust the pH of the calcium chloride solution thick liquid that makes in the step (1) to 6.5 with quicklime and water by weight ratio 1: 10;

[0033] (3) After step (2) adjusts the calcium chloride solution rough liquid of pH to leave s...

Embodiment 2

[0035] A kind of method utilizing industrial waste acid to produce liquid calcium chloride, the steps are as follows:

[0036] (1) be less than 0.5cm, CaO content greater than 40%, the limestone 900kg of surface without soil and impurity and concentration be 21% industrial waste hydrochloric acid 2200kg to add reaction tank mixing reaction in batches; Limestone adds from feed port, every time Add 85kg; hydrochloric acid is added in 4 times, 550kg is added each time, and the interval between each addition is 30 minutes, and the last batch of hydrochloric acid is added to the reaction tank and mixed for 1 hour to obtain a crude calcium chloride solution;

[0037] (2) adjust the pH of the calcium chloride solution thick liquid that makes in the step (1) to 7.5 with quicklime and water by weight ratio 1: 10;

[0038] (3) After step (2) adjusts the calcium chloride solution rough liquid of pH to leave standstill for 4 days, remove precipitation, obtain calcium chloride solution.

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Abstract

The invention relates to a preparation method of liquid calcium chloride, in particular to a method for producing the liquid calcium chloride by using the waste industrial acid, which belongs to the technology field of chemical industry. The preparation method is characterized in allowing massive limestone and waste hydrochloric acid obtained by acid washing strip steel to react at a certain ratio and neutralizing with lime cream to obtain calcium chloride at a certain concentration. Proved by the production, the preparation method is capable of effectively reducing the production cost and achieving comprehensive utilization of the waste industrial acid and remarkable economic and social benefits.

Description

technical field [0001] The invention relates to a method for producing liquid calcium chloride, in particular to a method for producing liquid calcium chloride by using industrial waste acid, and belongs to the technical field of chemical industry. technical background [0002] Calcium chloride is widely used in desiccants, dehydrating agents, refrigerants, locomotive antifreeze agents, silk fabric fireproofing agents, food preservatives, dye grinding aids, snow-melting agents, and synergists for sintered ore, etc., with a wide range of uses. The demand is high. Present liquid calcium chloride production method generally adopts hydrochloric acid and calcium carbonate or limestone to be raw material reaction to make, publication number is the Chinese patent of CN1058200, discloses " a kind of method for producing liquid calcium chloride ", is characterized in that " slow Under stirring, excess hydrochloric acid reacts with limestone pulp, carbon dioxide is removed under nega...

Claims

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Application Information

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IPC IPC(8): C01F11/28
Inventor 董丙成董杰吉许荣昌李西忠王成林闫志华王秀花
Owner KUNMING IRON & STEEL
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