Method for production of chemical raw materials by comprehensive utilization of lithium slag

A technology of chemical raw materials and lithium slag, applied in chemical instruments and methods, ammonium halide, silicon oxide, etc., can solve the problems of poor chemical composition, reduced economic benefits, complicated process, etc., to promote comprehensive utilization of decomposition, improve The effect of economic benefits and simple process steps

Inactive Publication Date: 2014-02-26
QINGDAO XINGHUO CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the beneficial components in the lithium slag are extracted, the added value of the product is increased, and the utilization rate of the lithium slag is improved, but its technological process is complicated, and the effect of extracting the chemical components in the lithium slag is not good, the equipment requirements are high, and the production cost is high. Larger, but also produce a large amount of waste water, waste gas and waste residue, which will lead to environmental pollution and reduce the economic benefits of production

Method used

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  • Method for production of chemical raw materials by comprehensive utilization of lithium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put 1g of lithium residue into the reaction kettle and dissolve it with 0.3ml of hydrochloric acid with a concentration of 11% by mass. After reacting for 0.2h, a reaction mixture was obtained. The mixture was washed with water and separated by pressure filtration to obtain a filter residue and a filtrate. Concentrate and crystallize the filtrate to obtain calcium chloride. Then, react the filter residue with 4.5ml of 25% fluosilicic acid and 0.15ml of concentrated sulfuric acid in a reaction kettle at a temperature of 110°C and 2atm for 3h. Absorb the generated gas with ammonia water with a concentration of 25% by mass, and separate the absorption liquid from the reaction mixture in the reactor to obtain solid a and separation liquid, and then crystallize the separation liquid to obtain ammonium fluoride and white carbon black . The solid a product was boiled and dissolved for 25 minutes, and then separated to obtain solid b and filtrate a, and then solid b was return...

Embodiment 2

[0030] Put 1g of lithium slag into the reaction kettle and dissolve it with 0.5ml of hydrochloric acid with a concentration of 11% by mass. After reacting for 0.5h, a reaction mixture was obtained. The mixture was washed with water and separated by pressure filtration to obtain a filter residue and a filtrate. Concentrate and crystallize the filtrate to obtain calcium chloride. Then, react the filter residue with 5ml of 15% fluosilicic acid by mass and 0.3ml of concentrated sulfuric acid in a reaction kettle at a temperature of 100°C and 2atm for 1.5h. Absorb the generated gas with ammonia water with a concentration of 15% by mass, and separate the absorption liquid from the reaction mixture in the reactor to obtain solid a and separation liquid, and then crystallize the separation liquid to obtain ammonium fluoride and white carbon black . The solid a product was boiled and dissolved for 20 minutes, and then separated to obtain solid b and filtrate a, and then solid b was re...

Embodiment 3

[0032] Put 1000g of lithium slag into the reaction kettle and dissolve it with 200ml of hydrochloric acid with a concentration of 15% by mass. After reacting for 0.5h, a reaction mixture was obtained. The mixture was washed with water and separated by pressure filtration to obtain a filter residue and a filtrate. Concentrate and crystallize the filtrate to obtain calcium chloride. Then, react the filter residue with 2000ml of 35% fluosilicic acid and 100ml of concentrated sulfuric acid in a reaction kettle at a temperature of 110°C and 2atm for 1.5h. Absorb the generated gas with ammonia water with a concentration of 25% by mass, and separate the absorption liquid from the reaction mixture in the reactor to obtain solid a and separation liquid, and then crystallize the separation liquid to obtain ammonium fluoride and white carbon black . The solid a product was boiled and dissolved for 30 minutes, and then separated to obtain solid b and filtrate a, and then solid b was retu...

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Abstract

The invention discloses a method for production of chemical raw materials by comprehensive utilization of lithium slag, and the method comprises the following steps: mixing hydrochloric acid and the lithium slag in a reactor for reaction for 0.2-0.5h, filter pressing the mixture to get a filter residue and a filtrate; performing concentration and crystallization of the filtrate to obtain calcium chloride; mixing the filter residue with fluosilicic acid and concentrated sulfuric acid for reaction, using ammonia water for absorption of a produced gas to obtain an absorption liquid, separating the absorption liquid and the reaction mixture to obtain a separating liquid and a solid a, crystallizing the separating liquid to obtain ammonium fluoride and white carbon black; adding an alkali to a filtrate a at the temperature of 40-50 DEG C for reaction for 30-40min, adjusting the pH value to 4.5 - 5.5, performing solid-liquid separation to obtain an aluminum salt and a filtrate b; and concentrating the filtrate b for crystallization to obtain ammonium sulfate crystal. The method is simple in process, can effectively extract useful components of the lithium slag, reduce waste water, waste gas and waste residue discharge rates, and further reduce environment pollution, and can reduce the production cost and improve economic efficiency.

Description

technical field [0001] The invention relates to the production technology of chemical raw materials, in particular to a method for producing chemical raw materials by comprehensive utilization of lithium slag. Background technique [0002] At present, the methods for extracting lithium element from lithium ore mainly include limestone roasting method and acid leaching method, wherein acid leaching method mainly uses sulfuric acid or sulfate to extract lithium element in lithium ore, and lithium slag is lithium ore A by-product produced after leaching lithium, which contains a large amount of Al 2 o 3 and SiO 2 These components are difficult to be comprehensively utilized in the acid leaching method and are lost in a large amount through the form of lithium slag, which leads to a large amount of waste of resources of Al and Si elements. [0003] For this reason, there have been many attempts to comprehensively utilize lithium slag. Lithium slag can be used in various field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/24C01B33/12C01C1/16C01C1/24C01F7/00
Inventor 薛彦辉
Owner QINGDAO XINGHUO CHEM TECH
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