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Method for preparing industrial calcium chloride

A technology for the production of industrial calcium chloride, applied in chemical instruments and methods, calcium/strontium/barium chloride, inorganic chemistry, etc., can solve problems such as polluting the environment and reducing the economic value of aquatic products, achieving less secondary pollution, Avoid ecological environment pollution, high value effect

Inactive Publication Date: 2011-05-11
ZHANGZIDAO GRP +1
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Problems solved by technology

Except for some beautiful shells used in handicrafts, most of these discarded shells have not been used and need to be transported to designated landfills for landfill treatment, which not only reduces the economic value of aquatic products, but also pollutes the environment and brings huge harm to the city. economic burden

Method used

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  • Method for preparing industrial calcium chloride

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Embodiment 1

[0018] The first step: shell pretreatment: remove the soil and other sundries on the surface of the shell with clean water, then crush it, store the powdered shell powder separately for later use, and control the particle size of the shell after crushing to about 16-20 mesh, because the particle size is too large It is inconvenient to stir during the reaction, and the particle size is too small and will be ejected by air bubbles during the reaction.

[0019] The second step: reaction stage: get 1.06 parts of pulverization (containing 1 part of calcium carbonate) and join in the middle of the reactor, under stirring condition, add concentrated hydrochloric acid (mass concentration 36%) slowly to the reaction that has been equipped with pulverized shell particles In the tank, control the acid addition rate at 1-1.5L / h, so as to avoid the phenomenon of "boiling" in the reaction tank when the acid addition rate is too fast. If the phenomenon of "potting" occurs, it can be solved b...

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Abstract

The invention relates to a production method of an inorganic compound, in particular to a production method of industrial calcium chloride. The industrial calcium chloride is prepared by using shells and hydrochloric acid as raw materials in a molar ratio of 1:2 to react and then performing filtration and crystallization. The reaction equation is as follows: CaCO3 + 2HCl = CaCl2 + H2O + CO2. The synthetic technological route of the invention is simple, the process has the advantage of no pollution and complete resource utilization, the secondary pollution is less in production process, the leakage of dust is low and the whole production process is environmentally friendly and controllable. Especially shells are used as raw material so as to greatly solve the treatment problem of the shells waste, avoid the ecological environment pollution caused by waste landfill treatment, have an active role in guiding the waste treatment method of the aquiculture in china and have outstanding environmental friend. The prepared carbon dioxide is needed to recycle, thus avoiding the atmospheric pollution caused by the carbon dioxide emission and further producing economic benefit and creating higher value.

Description

Technical field: [0001] The invention relates to a method for preparing inorganic compounds, in particular to a method for preparing calcium chloride from waste. Background technique: [0002] The annual output of solid calcium chloride in my country is about 50,000 tons, which has a large demand and a wide range of uses. Solid calcium chloride is a white crystal, which can be divided into flake, granular and powder according to different shapes. At the same time, due to the different crystal water contained in solid calcium chloride, solid calcium chloride is usually divided into Calcium Chloride Dihydrate and Calcium Chloride Anhydrous. Due to the unique physical properties of calcium chloride (especially solid calcium chloride) itself, such as high solubility, high heat of solution, strong hygroscopicity, low temperature dissolution and not easy to freeze, etc. Dustproof, oil drilling, moisture absorption, etc. have a wide range of uses. Granular anhydrous calcium chlo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/24B09B3/00C01B31/20C01B32/50
CPCY02W30/20
Inventor 马伟辛丘岩王刃程子洪秦承欢杨港赵南南田丽妍肖莉莉林燕兰姜晨于浩
Owner ZHANGZIDAO GRP
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