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Method for preparing calcium sulfate crystal whiskers through sugar mill scales

A technology of calcium sulfate whiskers and calcium sulfate, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems that cannot be directly applied to sugar factory scale treatment, etc., to improve comprehensive utilization, reduce emissions, and be green The effect of environmentally friendly production

Inactive Publication Date: 2013-04-24
北京蓝星清洗有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are many methods for preparing calcium sulfate whiskers by using industrial by-products, such as calcium carbide slag, seawater brine slag, citric acid slag, phosphogypsum, etc. Due to the particularity of the sugar scale itself, these methods cannot be directly applied Treatment of scale in sugar factories

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare a hydrochloric acid solution with a mass fraction of 5%, add a multi-purpose pickling corrosion inhibitor LAN-826 with a mass fraction of 0.3%, and prepare the required scale-dissolving agent. Take 80g of the scale sample from the sugar factory, add 1L of scale dissolving agent, heat and boil for 10 minutes. Filter the solution while it is hot, place it at room temperature to cool to room temperature, and age for 1 h. At this time, a large amount of calcium sulfate whiskers were precipitated in the solution. Stir the accumulated whiskers, filter with 800-mesh filter cloth, wash the precipitate, and dry the precipitate at 95°C to obtain calcium sulfate dihydrate whiskers with high whiteness. The whiskers have an average diameter of 1-4 μm and an average length of 500-1500 μm by electron microscope observation and measurement.

Embodiment 2

[0023] Prepare a hydrochloric acid solution with a mass fraction of 12%, add a commercial corrosion inhibitor with a mass fraction of 0.3%, and prepare the required scale-dissolving agent. Take 100g of sugar factory scale sample, add 1L of scale dissolving agent, heat and boil for 3 minutes. Filter the solution while it is hot, place it at room temperature to cool to room temperature, and age for 1 h. At this time, a large amount of calcium sulfate whiskers were precipitated in the solution. Stir the accumulated whiskers, filter with 800-mesh filter cloth, wash the precipitate, and dry the precipitate at 95°C to obtain calcium sulfate dihydrate whiskers with high whiteness. The whiskers have an average diameter of 1-4 μm and an average length of 500-1500 μm by electron microscope observation and measurement.

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Abstract

The invention discloses a method for preparing calcium sulfate crystal whiskers through sugar mill scales. The method comprises the steps of: dissolving scales through a method of heating and acidifying with diluted hydrochloric acid, filtering while hot, cooling and crystallizing. The method disclosed by the invention, through treating sugar mill scales, can convert the sugar mill scales into high-quality calcium sulfate crystal whiskers, so as to relieve pollution and save production cost. In the process, the high-quality calcium sulfate crystal whiskers can be prepared by filtering, washing and drying the crystal whiskers which are complete in growth. The product prepared by the method is high in purity, white in color and not easy to aggregate; and meanwhile, the problem on treating the sugar mill scales is solved, and the method is simple in preparation and easy to popularize.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfate whiskers, which can also be used for cleaning corrosion-resistant equipment fouling. technical background [0002] The sugar industry has always been an important industry for the country. At present, the sugar clarification methods adopted in my country mainly include lime method, sulfurous acid method and carbonic acid method. Because the sulfite method has the advantages of simple process and equipment, and low cost of sugar juice clarifiers (lime and sulfur), it has been adopted by most sugarcane sugar factories. But its main disadvantage is that the sugar juice has high calcium content and ash content. If lime is used as the sugar juice clarifying agent, it is easy to form scaling in different degrees in the heat exchange equipment, which makes the formed scale hard and difficult to remove. In addition, some sugar factories use evaporation to treat sewage and prepare phosphorus and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B7/14C23G1/04
Inventor 盛仲翰王双田曹季明单素灵申林涛文措杰李海
Owner 北京蓝星清洗有限公司
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