Method for preparing calcium sulfate whiskers and silica sol from low-grade wollastonite
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A calcium sulfate whisker, wollastonite technology, applied in chemical instruments and methods, silicon oxide, silicon dioxide, etc., can solve the problems of low added value, underutilization and development of wollastonite, and achieve convenient Large-scale application, expanding application market, easy to operate effect
Inactive Publication Date: 2018-08-17
黄石海纳新材料科技股份有限公司
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Problems solved by technology
However, the added value of low-grade wollastonite products with a settlement value less than 60 is extremely low and has not been fully utilized and developed
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Embodiment 1
[0021] Example 1, see figure 1 :
[0022] The present invention provides a method for preparing calcium sulfate whiskers and silica sol by using low-grade wollastonite. The Daye wollastonite mine in Hubei with a settlement value of 50 is used. The chemical composition is shown in Table 1. 98wt% industrial sulfuric acid, industrial grade sulfuric acid potassium.
[0023] Table 1 The mass fraction (%) of each component of wollastonite powder in Daye, Hubei
[0024]
[0025] Including the following steps:
[0026] 1) Pulverization: 1 ton of wollastonite ore is crushed into 120 mesh wollastonite powder, and the content of CaO in the wollastonite powder is determined to be 42.2% (corresponding to 0.75 moles);
[0027] 2) Hydrothermal reaction: Add wollastonite powder and 16 tons of water into the reaction kettle, set the reaction temperature to 50°C, turn on the agitator, control the speed at 80 rpm, and add 0.7530 tons of 98wt% industrial Concentrated sulfuric acid, stir ev...
Embodiment 2
[0031] The invention provides a method for preparing calcium sulfate whiskers and silica sol by using low-grade wollastonite, using wollastonite ore produced in Xinjiang with a settlement value of 50 as raw material, wherein the mass percentage of CaO is 46.21%, and the corresponding mole number is calculated is 0.82, including the following steps:
[0032] 1) Pulverization: 1 ton of wollastonite ore is pulverized into 130 mesh wollastonite powder, and the content of CaO in the wollastonite powder is determined to be 46.21%;
[0033] 2) Hydrothermal reaction: Add wollastonite powder and 16 tons of water into the reaction kettle, set the reaction temperature to 50°C, turn on the agitator, control the speed at 80 rpm, and add 0.7530 tons of 98wt% industrial Concentrated sulfuric acid, stir evenly, add 15kg potassium sulfate to react for 75min, stop stirring, adopt centrifugal dehydrator to filter, obtain solid calcium sulfate dihydrate whiskers and liquid silicic acid solution; ...
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Abstract
The invention provides a method for preparing calcium sulfate whiskers and silica sol from low-grade wollastonite. The method includes steps of carrying out smashing, to be more specific, smashing low-grade wollastonite fine ore with a sedimentation value lower than 60 to obtain wollastonite powder, and measuring the content of CaO in the wollastonite powder; carrying out hydrothermal reaction, tobe more specific, adding the wollastonite powder and water into a reaction kettle, adding sulfuric acid into the reaction kettle after the stirring rotational speeds are stable, uniformly stirring the wollastonite powder, the water and the sulfuric acid, adding potassium sulfate into the reaction kettle, carrying out reaction for 75 min, stopping stirring and carrying out filtering to obtain calcium sulfate dihydrate whiskers and silicic acid solution; preparing the calcium sulfate whiskers, and to be more specific, drying the calcium sulfate dihydrate whiskers to obtain the anhydrous calciumsulfate whiskers; preparing the silica sol, to be more specific, purifying the silicic acid solution, regulating the pH (potential of hydrogen) value of the silicic acid solution and concentrating the silicic acid solution to allow the solution density to reach 1.12 g / cm<3> so as to obtain the silica sol. The method has the advantages that the low-grade wollastonite is used as a raw material, thecalcium sulfate whiskers and the silica sol can be prepared by means of low-temperature hydrothermal reaction, accordingly, the added value can be greatly increased, application markets can be expanded, and the method is simple and is easy to operate.
Description
technical field [0001] The invention relates to the technical field of deep processing and utilization of non-metallic ores, in particular to a method for preparing calcium sulfate whiskers and silica sol by using low-grade wollastonite. Background technique [0002] Calcium sulfate whisker, also known as gypsum whisker, is a new type of functional material with excellent performance and low price. Because of its extremely high tensile strength and elastic modulus, it is a high-value industrial material that can be used as a reinforcing agent or functional filler in resins, rubber, coatings, and papermaking, as well as friction materials and building materials. , sealing materials, heat preservation and flame retardant materials, etc., have extremely broad development prospects. [0003] Usually the raw material for preparing calcium sulfate whiskers is mainly natural gypsum or various industrial by-product gypsum. Wollastonite is a natural calcium metasilicate mineral wit...
Claims
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