Method for manufacturing calcium aluminate cement by adopting alloy slag

A technology for calcium aluminate cement and slag, which is applied in the field of calcium aluminate cement manufacturing, can solve the problems of high manufacturing cost, low added value, and does not meet environmental protection requirements, and achieves the effects of low manufacturing cost and high added value.

Inactive Publication Date: 2009-12-16
李子洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is calcium aluminate cement or pure calcium aluminate cement, there are problems of harsh production process conditions and high manufacturing costs.
However, the slag from smelting ferrovanadium and vanadium-aluminum by the aluminothermic reduction method generally adopts two treatment methods, one is added to cement, which has low added value; Meet environmental protection requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The aluminothermic reduction method smelting ferrovanadium or vanadium-aluminum slag is crushed to 200 mesh by a crusher, and then powdered; add sodium carbonate (sodium chloride or sodium sulfate can also be added) according to 10% of the total weight of the powder, and grind it in a rotary kiln or Roasted at high temperature in a shaft furnace at a furnace temperature of 1000°C or 1200°C for 3 hours; the roasted material was leached in hot water at 60°C for 120 minutes, and then filtered; the filtrate was passed through sulfuric acid (or hydrochloric acid) to adjust the pH value to 1.5, Add ammonium sulfate (or ammonium chloride) according to the weight ratio of vanadium in the filtrate to 1:1, heat to 80°C, precipitate ammonium polyvanadate after 120 minutes, and then melt it into vanadium pentoxide at a high temperature of 850°C. sale; the filter residue is washed, dried, and milled through 240 mesh to produce calcium aluminate cement.

Embodiment 2

[0012] The aluminothermic reduction method smelting ferrovanadium or vanadium-aluminum slag is crushed to 320 mesh by a crusher, and then powdered; add sodium carbonate (sodium chloride or sodium sulfate can also be added) according to 30% of the total weight of the powder, and use it in a rotary kiln or Roast in a shaft furnace at high temperature at 1400°C for 1 hour; the roasted material is leached in hot water at 98°C for 30 minutes, then filtered; add sulfuric acid (or hydrochloric acid) to the filtrate to adjust the pH value to 3.5, and press Ammonium sulfate (or ammonium chloride) is added in the vanadium element weight ratio of 1:1, and ammonium polyvanadate is precipitated after heating to 100°C for 30 minutes, and then melted into vanadium pentoxide at 800°C for sale; the filter residue is cleaned , drying, and milling through 320 mesh to obtain calcium aluminate cement.

Embodiment 3

[0014] The aluminothermic reduction method smelting ferrovanadium or vanadium-aluminum slag is crushed to 300 mesh by a crusher, and then powdered; add sodium carbonate (sodium chloride or sodium sulfate can also be added) according to 20% of the total weight of the powder, and grind it in a rotary kiln or Roasted in a shaft furnace at high temperature at 1280°C for 2.5 hours; the roasted material was leached in hot water at 78°C for 90 minutes and then filtered; adding sulfuric acid (or hydrochloric acid) to the filtrate to adjust the pH to 2.5 Add ammonium sulfate (or ammonium chloride) at a vanadium element weight ratio of 1:1, heat to 90°C, precipitate ammonium polyvanadate after 90 minutes, and then melt it into vanadium pentoxide at a high temperature of 830°C for sale; the filter residue is cleaned , drying, and milling through 300 mesh to obtain calcium aluminate cement.

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Abstract

The invention relates to a method for manufacturing calcium aluminate cement by adopting alloy slag. The method comprises the following steps that: high-vanadium ferroalloy or vanadium-aluminum slag is crushed to 200-320 meshes by a crusher and milled; sodium carbonate or sodium chloride or sodium sulfate is added according to 10%-30% of the total weight of the powder material, the mixture is calcined at high temperature in a rotary kiln or a vertical furnace, the furnace temperature is 1000-1400DEG C, and calcination is carried out for 1-3 hours; a calcined material is leached by hot water and then is filtered; sulfuric acid or hydrochloric acid is added into filter liquor to adjust the pH value to 1.5-3.5, then ammonium sulfate or ammonium chloride is added according to the weight ratio of 1:1 of vanadium elements in the filter liquor, the mixture is heated to 80-100DEG C, multi-vanadium acid ammonium is precipitated after 30-120 minutes, and vanadium pentoxide is obtained by high-temperature smelting at 800-850DEG C; and filter slag is washed, dried, milled by 240-320 meshes and manufactured into the calcium aluminate cement. The method can use an aluminothermy reduction method to carry out the slag recovery processing of smelted vanadium iron and vanadium aluminum and can prepare the calcium aluminate cement, the manufacturing cost is low, the product quality is good, and a byproduct of the vanadium pentoxide can be produced and has high addition value; and solid wastes can be recovered and utilized, and the method conforms to the requirement of environmental protection.

Description

technical field [0001] The invention relates to a method for producing calcium aluminate cement by using alloy slag. Background technique [0002] Calcium aluminate cement is a high temperature resistant hydraulic binder, which is a necessary material in the lining of various high temperature furnaces. Its manufacturing method is to mix natural bauxite or industrial alumina with calcium carbonate (limestone) in a certain proportion, and then make it by calcining or electric melting; it can also be made by combining bauxite and limestone by melting. Pure calcium aluminate cement is made of pure alumina and pure lime as raw materials through electric melting. Both calcium aluminate cement and pure calcium aluminate cement have the problems of harsh production process conditions and high manufacturing costs. However, the slag from smelting ferrovanadium and vanadium-aluminum by the aluminothermic reduction method generally adopts two treatment methods, one is added to cement,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B7/36B09B3/00C01G31/02
CPCC04B7/323
Inventor 李子洋
Owner 李子洋
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