Method for producing dehydrated calcium sulfate whisker

A technology of calcium sulfate whisker and calcium sulfate dihydrate, which is applied to the preparation of dehydrated calcium sulfate whiskers and the field of preparing calcium sulfate whiskers at the same time, can solve the problem of calcium nitrate or calcium chloride waste water, increase leakage and pollute the environment, and increase transportation costs. and other problems to achieve the effect of reducing production costs, reducing reunion, and reducing electroplating pollution

Inactive Publication Date: 2009-10-07
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The added value of these products is low, sales are difficult, and the amount of waste water is large, especially the production process is complicated, and the leachate cannot be recycled during the production process.
In addition, there are many nitric acid stripping solutions in the electroplating industry, which cannot be treated in situ, which increases transportation costs and increases the possibility of leakage and pollution of the environment
If calcium oxide is used for neutralization, a large amount of calcium nitrate or calcium chloride wastewater will be produced, which cannot be treated

Method used

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  • Method for producing dehydrated calcium sulfate whisker
  • Method for producing dehydrated calcium sulfate whisker
  • Method for producing dehydrated calcium sulfate whisker

Examples

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Embodiment 1

[0033] The present embodiment provides a kind of preparation method of dehydrated calcium sulfate whisker, specifically comprises: measure the calcium nitrate aqueous solution 3000ml that produces in the process of processing nickel-containing mineral when taking nitric acid as leaching agent, wherein calcium ion concentration is 61.3g / L, Add 10 mL / L glycerin or oleic acid and heat it to 50°C. When the temperature of the calcium nitrate aqueous solution reaches 50°C, keep stirring. Get 240ml of 98% concentrated sulfuric acid in addition, it is added dropwise in the calcium nitrate aqueous solution, and stirring speed is 300rpm, dihydrate calcium sulfate crystal whisker is constantly separated out (the XRD pattern of dihydrate calcium sulfate crystal whisker is consistent with PDF card No. 33-0311 ). After about 23 minutes, all 240ml of concentrated sulfuric acid was added dropwise, and the stirring was continued for 10 minutes. The calcium sulfate dihydrate whiskers are filt...

Embodiment 2

[0035] This embodiment provides a method for preparing dehydrated calcium sulfate whiskers, which specifically includes: measuring the mixed aqueous solution of calcium nitrate and calcium chloride produced in the process of treating cobalt-containing cemented carbide waste when a mixture of nitric acid and hydrochloric acid is used as the leaching agent 3000ml, in which the calcium ion concentration is 70.1g / L, add 20mL / L glycerin or oleic acid, and heat it to 65°C. When the temperature of the mixed aqueous solution of calcium nitrate and calcium chloride reaches 65°C, keep stirring. Take another 270ml of 98% concentrated sulfuric acid, dilute it to a volume of 700ml, heat it to 65°C, and then add it dropwise to the mixed aqueous solution of calcium nitrate and calcium chloride. The stirring speed is 350rpm, and calcium sulfate dihydrate whiskers are continuously precipitated. After about 40 minutes, all 700ml of dilute sulfuric acid aqueous solution was added dropwise, and t...

Embodiment 3

[0037] The present embodiment provides a preparation method of dehydrated calcium sulfate whiskers, which specifically includes: measuring 3000ml of calcium nitrate aqueous solution produced in the process of electroplating stripping when nitric acid is used as the leaching agent, wherein the concentration of calcium ions is 53.6g / L, adding 10mL / L glycerol, heated to 40°C. When the temperature of the calcium nitrate aqueous solution reaches 40°C, keep stirring and add 20 mL / L of glycerin or oleic acid. Another 200ml of 98% concentrated sulfuric acid was taken, diluted to a volume of 800ml, heated to 40°C, and then added dropwise to the aqueous calcium nitrate solution with a stirring speed of 400rpm, and calcium sulfate dihydrate whiskers were continuously precipitated. After about 40 minutes, all 800ml of dilute sulfuric acid aqueous solution was added dropwise, and the stirring was continued for 10 minutes. Calcium sulfate dihydrate whiskers are filtered from the aqueous so...

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Abstract

The invention provides a method for producing dehydrated calcium sulfate whisker, comprising: using copper, lead, zinc, aluminium, nickel, cobalt, stannum, non-ferrous metal secondary resource cycle utilizing, calcium nitrate solution produced in treating process of electroplating waste, calcium chloride solution, or mixed water solution of calcium nitrate and calcium chloride as raw material, using sulfuric acid as calcium ion precipitant, adding whisker shape regulating agent, controlling reaction condition, regenerating aqua fortis or hydrochloric acid lixiviant, and simultaneously producing ultralong and big length to diameter ratio calcium sulphate dihydrate whisker. After calcium sulphate dihydrate whisker is deposited from calcium nitrate solution, calcium chloride solution or the mixed solution of calcium nitrate and calcium chloride are deposited, the water solution is translated to be nitric acid solution, hydrochloric acid solution or a mixed solution of nitric acid and hydrochloric acid, returning back to leaching out or treating process for processing non-ferrous metal mineral substance, non-ferrous metal secondary resource or electroplating remove. The calcium sulphate dihydrate whisker is treated by microwave heating, forming calcium sulfate hemihydrate or anhydrous sulphate of calcium after dehydration.

Description

technical field [0001] The invention relates to a method for preparing dehydrated calcium sulfate whiskers, and belongs to the technical fields of nonferrous metallurgy, resource recycling and inorganic materials. In particular, it relates to the treatment of non-ferrous metal mineral smelting, non-ferrous metal secondary resource recycling and electroplating deplating process of calcium nitrate aqueous solution, calcium chloride aqueous solution or mixed aqueous solution of calcium nitrate and calcium chloride, and a method for simultaneously preparing calcium sulfate whiskers. technical background [0002] Calcium sulfate whisker (or gypsum whisker, gypsum fiber) has high strength, high modulus, high toughness, high insulation, wear resistance, high temperature resistance, acid and alkali resistance, corrosion resistance, good infrared reflectivity, easy to surface Handling, easy to compound with polymers, non-toxic and many other excellent physical and chemical properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/22C30B29/62C01F11/46C04B11/036
Inventor 王成彦尹飞李敦钫杨卜陈永强揭晓武阮书峰杨永强王军郜伟王忠
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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