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Alkali manufacturing technology for combined production of sulfuric acid and cement

A technology of sulfuric acid and cement, applied in the direction of sulfur compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of high energy consumption, large investment, high quality requirements of raw salt, etc., achieve good product sales and reduce overall production costs

Inactive Publication Date: 2012-02-15
HUNAN HENGGUANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] (2), serious pollution
[0012] (1) High requirements on raw salt quality
[0013] (2) Large investment and high energy consumption of synthetic ammonia plant
[0014] (3) It is difficult to sell ammonium chloride products formed by joint production, and there is no market prospect
[0016] The main disadvantage of this method is that it is limited by the source of raw materials

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0074] The technology of the present invention is illustrated by taking a production line with annual co-production of 300,000 tons of soda ash, 280,000 tons of sulfuric acid, and 420,000 tons of cement clinker as an example.

[0075] 1. Basic material consumption

[0076] Anhydrous sodium sulfate consumption: 406,000 tons / year, purity 99%.

[0077] Calcium oxide: 166,000 tons / year, purity 96%;

[0078] Industrial coal (for calcination kilns) is 9.6 tons per year, the carbon content is greater than 65%, and the combustion calorific value is greater than 6000kcal / kg.

[0079] 2. Formation of calcium sulfate dihydrate precipitate

[0080] The total amount of waste liquid from the ammonia regeneration system is 225 tons / hour, and the concentration of calcium chloride in the waste liquid is 17.03%; the content of sodium chloride is 4.68%. The required sodium sulfate consumption is 49.08 tons / hour.

[0081] (1), the formation of calcium sulfate dihydrate precipitate

[0082] D...

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PUM

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Abstract

An alkali manufacturing technology for the combined production of sulfuric acid and cement. According to the invention, anhydrous sodium sulfate, calcium oxide and fine coal are used as basic raw materials. By the basic technological principle of the soda ash preparation technology, a calcium chloride waste liquid formed during the soda ash preparation and ammonia regeneration process is recovered so as to obtain dihydrate calcium sulphate. By the adoption of the gypsum acid making technological principle, the dihydrate calcium sulphate is used as a raw material for the combined production of soda ash, sulfuric acid and cement clinker, thus greatly reducing the comprehensive production cost of the products and solving problems caused by ammonia-nitrogen emission and a lot of by-products during the soda ash production process. The invention is of great importance for the energy saving and emission reduction, comprehensive utilization of resources and development of circular economy in the chemical industry.

Description

technical field [0001] The invention discloses a soda-making process for co-producing sulfuric acid and cement; anhydrous sodium sulfate, lime and reduced coal are used as basic raw materials to realize the co-production process technology of soda ash, sulfuric acid and cement, which belongs to the preparation and recycling of chemical products technology field. technical background [0002] 1. Industrial soda ash [0003] Soda ash is a basic chemical raw material, mainly used in light industry, building materials and chemical industry. The glass industry is the largest consumer sector of soda ash, consuming 0.2 tons of soda ash per ton of glass. At present, the output of soda ash in the world exceeds 40 million tons, and the output of soda ash in China is close to 20 million tons. There are three main techniques for the preparation of soda ash: [0004] 1. Solvay soda production method. [0005] The Solvay soda method is also called the ammonia soda method. The saturat...

Claims

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Application Information

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IPC IPC(8): C01B17/74C04B11/02
Inventor 曹立祥陈建国
Owner HUNAN HENGGUANG TECH
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