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Comprehensive Utilization Method of Acid Etched Glass Slag
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A technology of glass slag and acid etching, applied in chemical instruments and methods, aluminum sulfate, fluorosilicic acid, etc., can solve the problems of high cost of glass slag treatment, waste of fluorine and aluminum resources, etc., achieve short treatment process, low investment, The effect of simple conditions
Active Publication Date: 2020-01-03
衢州市鼎盛化工科技有限公司
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Problems solved by technology
[0006] The invention proposes a method for comprehensive utilization of acid-etched glass slag, which solves the problems of high processing cost of glass slag in glass thinning and waste of fluorine and aluminum resources in the prior art
Method used
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Embodiment 1
[0026] The glass slag used in this example: the glass slag discharged from a glass thinning workshop, with an ignition loss of 56.50% and a solid content of 43.50% (among them aluminum fluoride 28.00%, magnesium fluoride 0.17%, calcium fluoride 5.71%, fluoride strontium chloride 9.09%, others 0.53%); the composition of the mother liquor in the glass slag filtration process is: HF-10%, H 2 SiF 6 -10%, HCl -5%, soluble salt -0.93%, and the rest is process water.
[0027] A method for comprehensive utilization of acid-etched glass slag, comprising the steps of:
[0028] Step S1: Dry the glass slag
[0029] Start the exhaust gas absorption system and heating system of the rotary kiln, control the rotation speed of the rotary kiln at 1rpm, take 500kg of fluorogypsum, put it into the rotary kiln with a screw, and then send 2000kg of wet glass slag into the rotary kiln, and then clean it with 500kg of fluorogypsum The spiral controls the hot air temperature of the rotary kiln to 5...
Embodiment 2
[0036] The glass slag used in this example: the glass slag discharged from a glass thinning workshop, with an ignition loss of 56.50% and a solid content of 43.50% (among them aluminum fluoride 28.00%, magnesium fluoride 0.17%, calcium fluoride 5.71%, fluoride strontium chloride 9.09%, others 0.53%); the composition of the mother liquor in the glass slag filtration process is: HF-10%, H 2 SiF 6 -10%, HCl -5%, soluble salt -0.93%, and the rest is process water.
[0037] A method for comprehensive utilization of acid-etched glass slag, comprising the steps of:
[0038] Step S1: Dry the glass slag
[0039] Start the exhaust gas absorption system and heating system of the rotary kiln, control the rotation speed of the rotary kiln at 1rpm, take 500kg of fluorogypsum, put it into the rotary kiln with a screw, and then send 2000kg of wet glass slag into the rotary kiln, and then clean it with 500kg of fluorogypsum The spiral is heated indirectly by hot air, and the temperature of ...
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Abstract
The invention provides a method for comprehensively utilizing acid etched glass slag. The method comprises the following steps: (1) heating the acid etched glass slag to evaporate fluorine-containing acid liquid on the surface of the acid etched glass slag; absorbing fluorine-containing acid liquid with water to prepare the fluorine-containing acid liquid; (2) putting the dried glass slag and concentrated sulfuric acid into a reactor; condensing gas, produced by reaction, by adopting indirect heating to obtain anhydrous hydrogen fluoride and absorbing uncondensed gas with water; outputting slag; (3) adding the slag into process water and dissolving, wherein a solution formed by dissolving the slag is an aluminum sulfate solution and concentrating the aluminum sulfate solution to obtain an aluminum sulfate solid product; carrying out solid-liquid separation on undissolved solid matters to form a strontium sulfate or / and calcium sulfate finished product. According to the method provided by the invention, fluorine in the glass slag produced in a glass thinning process is recycled and is prepared into the anhydrous hydrogen fluoride and fluorosilicic acid; aluminum and strontium are prepared into the aluminum sulfate and the strontium sulfate, which have economic value, so that the treatment problem that the glass slag is dangerous wastes is solved and products with higher economic value are obtained; the method is suitable for being industrially popularized and applied.
Description
technical field [0001] The invention relates to the field of waste treatment generated in the glass thinning process, in particular to the comprehensive utilization of acid-etched glass slag. Background technique [0002] Electronic equipment has been developing in the direction of thinner and lighter, so in the production process of glass display screens for mobile devices or handheld devices, there is a glass thinning process, which uses chemical corrosion to make the display glass reach the thickness required by the process; A certain amount of sediment will be produced during the thinning process, which is called glass slag in the glass thinning industry. [0003] The glass components used to make displays all contain SiO 2 、Al 2 o 3 , B 2 o 3 , while adding MgO, CaO, SrO, etc. to adjust the characteristics of the glass. At present, the glass thinning industry uses hydrofluoric acid as the main thinning chemical. The glass slag produced during the thinning process ...
Claims
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Application Information
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