Method for producing calcium chloride based on carbide slag as raw material

A technology of carbide slag and calcium chloride, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the difficulty in controlling the alkalinity index of calcium chloride and the slow reaction speed of hydrochloric acid and carbide slag. and other problems to achieve the effect of overcoming odor, less moisture and low moisture content

Active Publication Date: 2013-08-28
ELECTROCHEM PLANT OF ZHEJIANG JUHUA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the particularity of the composition of carbide slag, there are technical defects in the existing method of producing calcium chloride by utilizing carbide slag: the first is that the reaction speed of hydrochloric acid and carbide slag is slow, the second is that the reaction between carbide slag and hydrochloric acid produces malodorous gas, and the third is calcium chloride. It is very difficult to control the alkalinity index. Therefore, the above technical obstacles must be overcome in order to produce calcium chloride by large-scale utilization of calcium carbide slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Get 400g of 18% hydrochloric acid in a 1000ml flask, slowly add 145g of calcium carbide slag (moisture content 8%, dry basis calcium hydroxide content 80%, particle diameter less than 1mm) discharged from the wet acetylene plant after drying and crushing under stirring, and simultaneously Continuously add 2.0 g of 30% hydrogen peroxide (dilute the hydrogen peroxide to 20 ml for convenience and control and then continuously add), control the reaction temperature at 90° C., and absorb the waste gas generated with 1% sodium hydroxide solution. After the addition, the stirring reaction was continued until the pH value was 12, and then the stirring was stopped and filtered. Weigh 400g of the filtrate and neutralize it with hydrochloric acid until the pH is 5, heat and concentrate on an electric furnace until the mass percentage concentration of calcium hydroxide is 60%, then move to a high-temperature furnace and bake at 240°C for 2 hours, and obtain 93 grams of off-white anh...

Embodiment 2

[0020] Get 400g31% hydrochloric acid in the 1000ml flask, slowly add the mixture of dry process calcium carbide slag and calcium hypochlorite under stirring (moisture content 8%, dry basis calcium hydroxide content 80%, particle diameter is less than 1mm, calcium carbide slag and hypochlorous acid The mass ratio of calcium is 100:1) 200g, the reaction temperature is controlled at 60°C, and the waste gas produced is absorbed with 1% sodium hydroxide solution. After the addition, continue to stir the reaction until the pH value is 11, stop stirring, and filter. Weigh 400g of the filtrate and neutralize it with hydrochloric acid until the pH is 7, heat and concentrate on an electric furnace until the mass percentage concentration of calcium hydroxide is 60%, then move to a high-temperature furnace and bake at 240°C for 2 hours, and obtain 168 grams of off-white anhydrous after cooling calcium chloride. After determination, no divalent sulfur was detected in the sodium hydroxide ...

Embodiment 3

[0022] Get 400g of 25% hydrochloric acid in a 1000ml flask, slowly add 150g of dry-process carbide slag (8% water content, 80% calcium hydroxide content on a dry basis, and a particle size less than 1mm) under stirring, and simultaneously add 2.8g of 30% hydrogen peroxide (for It is convenient to control (dilute hydrogen peroxide to 20ml and then add continuously), the reaction temperature is controlled at 75°C, and the waste gas generated is absorbed with 1% sodium hydroxide solution. After the addition, the stirring reaction was continued until the pH value was 10, and then the stirring was stopped and filtered. Weigh 400g of the filtrate and neutralize it with hydrochloric acid until the pH is 9, heat and concentrate it on an electric furnace until the mass percentage of calcium hydroxide is 60%, then move it to a high-temperature furnace and dry it at 240°C for 2 hours, and obtain 136 grams of off-white anhydrous after cooling calcium chloride. After determination, no div...

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Abstract

The invention discloses a method for producing calcium chloride based on carbide slag as a raw material. The method is characterized by comprising the following steps: slowly adding the carbide slag with a particle size of less than 0.1 centimeter and calcium hypochlorite or hydrogen peroxide as a deodoriferant in 18%-31% hydrochloric acid, and controlling the reaction temperature to 60 DEG C-90 DEG C; after material addition is finished, continuing stirring and reacting until the pH value is 10-12; and filtering, regulating the pH value of filtrate back to 5-9; and heating and concentrating,crystallizing and drying so as to obtain solid calcium chloride. The method is high in reaction speed, and metal ions such as magnesium ion and the like are effectively removed through controlling the alkalinity index of a product, so that the quality of calcium chloride is improved; and the deodoriferant is synchronously added in the reaction, so that substances such as sulfides, phosphides and the like which can generate malodorous gases in the carbide slag can be synchronously removed, the utilization rate of the deodoriferant is high, and no impurities are introduced, thereby improving operation environment and reducing emission of waste gases.

Description

technical field [0001] The invention relates to a method for producing calcium chloride, in particular to a method for producing calcium chloride by using carbide slag as a raw material. Background technique [0002] Calcium chloride is widely used as a precipitant for the production of lake pigments; as a desiccant for the production of nitrogen, acetylene, hydrogen chloride, oxygen and other gases; as a dehydrating agent for the production of alcohols, ethers, esters and acrylic resins; its aqueous solution is frozen It is an important refrigerant for machines and refrigeration; it can also accelerate the hardening of concrete, increase the cold resistance of cement mortar, and is an excellent antifreeze agent; it can also be used as a protective agent and refining agent for aluminum-magnesium metallurgy. There are currently two mature production routes for calcium chloride, one is to produce calcium chloride with limestone and hydrochloric acid as raw materials, and the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/24
Inventor 杨仲苗郑苏云姜文军姜志田
Owner ELECTROCHEM PLANT OF ZHEJIANG JUHUA
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