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A recovery process for preparing calcium sulfate by utilizing carbide slag

A calcium carbide slag, calcium sulfate technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of low comprehensive utilization efficiency of resources, irregular product form, low purity of calcium sulfate, etc. The effect of material layering is obvious

Active Publication Date: 2017-11-10
HWASU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing calcium carbide slag has a low comprehensive utilization efficiency of resources, and the purity of the generated calcium sulfate is low. The color of the product is dark due to the solid particle impurities such as ferrosilicate and coke, and a small amount of hydrogen sulfide, phosphine, and arsine are adsorbed at the same time. , hydrogen silicide or ammonia impurity gas, resulting in bad smell; in addition, the shape of the filtered and dried product is irregular, the dust is too fine, resulting in a large amount of dust, and the particle size is too large, and additional crushing or grinding devices are required, which increases the cost

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] A kind of recovery technology that utilizes calcium carbide slag to prepare calcium sulfate, comprises following specific steps:

[0028] (1) Add 100Kg of water into the 250L reaction kettle, turn on the stirring device of the reaction kettle, the stirring speed is 1500r / min, turn on the heating device until the internal system temperature reaches 55°C, add 0.08Kg of gelatin powder with a diameter of 75nm into it, after After 30 minutes, the gelatin fully absorbs water and swells and softens, then add 15Kg of carbide slag, and stir for 30 minutes to make the calcium hydroxide in a colloidal state;

[0029] (2) Open the discharge valve, filter the above colloidal material through a filter that has been preheated and kept at 55°C and equipped with quantitative filter paper with a pore size of 60um, and collect the preliminary filtrate;

[0030] (3) Pass the above primary filtrate through an ultrafiltration device that has been preheated and kept at 55°C and equipped with ...

Embodiment 2

[0036] A kind of recovery technology that utilizes calcium carbide slag to prepare calcium sulfate, comprises following specific steps:

[0037] (1) Add 100Kg of water into the 250L reaction kettle, turn on the stirring device of the reaction kettle, the stirring speed is 1500r / min, turn on the heating device until the internal system temperature reaches 45°C, add 0.05Kg of alginic acid with a diameter of 50nm into it, after After 30 minutes, the gelatin fully absorbs water and swells and softens, then add 10Kg of carbide slag, and stir for 30 minutes to make the calcium hydroxide in a colloidal state;

[0038] (2) Open the discharge valve, filter the above colloidal material through a filter that has been preheated and kept at 45°C and equipped with a quantitative filter paper with a pore size of 1um inside, and collect the preliminary filtrate;

[0039] (3) Pass the above-mentioned primary filtrate through an ultrafiltration device that has been preheated and kept at 45°C an...

Embodiment 3

[0045] A kind of recovery technology that utilizes calcium carbide slag to prepare calcium sulfate, comprises following specific steps:

[0046] (1) Add 100Kg of water into the 250L reaction kettle, turn on the stirring device of the reaction kettle, the stirring speed is 1500r / min, turn on the heating device until the internal system temperature reaches 65°C, and add 0.1Kg of carboxymethyl fiber with a diameter of 100nm into it Add 20Kg of calcium carbide slag after 30 minutes of gelatin fully absorbing water and swelling and softening, and stir for 30 minutes to make calcium hydroxide in a colloidal state;

[0047] (2) Open the discharge valve, filter the above colloidal material through a filter that has been preheated and kept at 65°C and equipped with a quantitative filter paper with a pore size of 120um inside, and collect the preliminary filtrate;

[0048] (3) Pass the above primary filtrate through an ultrafiltration device that has been preheated and kept at 65°C and ...

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Abstract

A recovery process for preparing calcium sulfate by utilizing carbide slag is provided. The process includes (1) adding a polymer surfactant into hot water and then adding the carbide slag into the mixture; (2) performing filtration with filter paper; (3) performing filtration with an ultrafiltration membrane; (4) performing degassing treatment by utilizing an ultrasonic instrument and a vacuum pump; (5) adding a saturated sodium chloride solution to precipitate calcium hydroxide solid; (6) performing a reaction with diluted sulfuric acid to form calcium sulfate; and (7) performing filtration and drying the calcium sulfate to obtain high-purity calcium sulfate crystals. The process is advantageous in that the polymer surfactant is added and ensures a stable colloid state of the calcium hydroxide; solid particle impurities such as ferrosilicon and coke are removed through filtration with the filter paper so that a product has good color; the polymer surfactant is removed through filtration with the ultrafiltration membrane; the product is free of odor through degassing treatment; and through adding the saturated sodium chloride solution, the calcium hydroxide solid is precipitated rapidly, a prepared calcium sulfate product has a single crystal form, regular shapes, uniform granularity and a high purity.

Description

technical field [0001] The invention relates to the technical field of calcium carbide slag recovery, in particular to a recovery process for preparing calcium sulfate from calcium carbide slag. Background technique [0002] Calcium carbide slag is the waste residue mainly composed of calcium hydroxide after hydrolysis of calcium carbide to obtain acetylene gas. Acetylene is one of the important raw materials in the basic organic synthesis industry, and calcium carbide (CaC 2 ) as raw material, the process of producing acetylene by adding water is simple and mature, and it currently accounts for a large proportion in our country. Adding water to 1 ton of calcium carbide can generate more than 300 kg of acetylene gas, and at the same time generate 10 tons of industrial waste liquid with a solid content of about 12%, commonly known as calcium carbide slurry. The use of calcium carbide slag can replace limestone to make cement, produce quicklime as calcium carbide raw materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
CPCC01F11/46
Inventor 高旭李毅王小勇王明钦陈群涛
Owner HWASU
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