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Method for co-producing cement, sulfuric acid and gypsum by using lead-zinc tailings and acid-leaching electrolytic manganese residues as main raw materials

A technology of electrolytic manganese slag, the main raw material, applied in chemical instruments and methods, calcium/strontium/barium sulfate, sulfur compounds, etc.

Inactive Publication Date: 2010-03-17
湘西自治州兴湘科技开发有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no method of co-producing cement, sulfuric acid and gypsum with lead-zinc tailings and acid leaching electrolytic manganese slag as the main raw materials

Method used

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  • Method for co-producing cement, sulfuric acid and gypsum by using lead-zinc tailings and acid-leaching electrolytic manganese residues as main raw materials
  • Method for co-producing cement, sulfuric acid and gypsum by using lead-zinc tailings and acid-leaching electrolytic manganese residues as main raw materials

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Embodiment Construction

[0009] The main raw materials are Huayuan lead-zinc tailings and acid leaching electrolytic manganese slag, which are shown in Table 1, and the lead-zinc tailings, acid leaching electrolytic manganese slag, diaspore or bauxite, and iron powder are as shown in Table 2. After the ingredients reach the rate value in Table 3 (the ingredients of each batch of raw materials are different in production, the ratio of raw materials should be changed appropriately according to the change of ingredients, so as to meet the requirements of each rate value set), grind to 0.08mm sieve residue Less than 10%, the mixture is sent to the rotary kiln and calcined at 1390°C ± 50°C with the coal in the proportion in Table 2 as fuel, and the clinker obtained by quenching meets the requirements of 52.5 grade cement (results are shown in Table 4).

[0010] The kiln gas SO that will be produced 2 Sulfuric acid product (containing H 2 SO 4 ≥98%), each process is normally controlled according to the tr...

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Abstract

The invention discloses a method for co-producing cement, sulfuric acid and gypsum by using lead-zinc tailings and acid-leaching electrolytic manganese residues as main raw materials. The method is characterized by comprising the following steps: mixing - raw materials of 67-75% of lead-zinc tailings, 16-21% of acid-leaching electrolytic manganese residues, 0-2% of aluminum raw materials and 0-2%of iron powders by weight percentage, grinding the mixture to 180 mesh, feeding the mixture into a rotary kiln and adding 9-12% of coals, taking the coals as a fuel for forging at 1,390+ / -50 DEG C toobtain cement clinkers; purifying, transforming and absorbing kiln gas SO2 generated by the cement forging to obtain sulfuric acid product in which the content of H2SO4 is no less than 98%; and transmitting the other part of purified SO2 gas to an absorbing tower to be absorbed by lead-zinc tailings slurry, and carrying out air oxidation and separation to obtain gypsum with a purity higher than 95%. In the invention, a great deal of lead-zinc tailings and acid-leaching electrolytic manganese residues are used up so as to solve the problems of environment and potential safety hazard, and threeco-products are obtained so as to realize the purpose of recycling waste materials.

Description

technical field [0001] The invention relates to a method for co-producing cement, sulfuric acid and gypsum with lead-zinc tailings and acid leaching electrolytic manganese slag as main raw materials. Background technique [0002] Lead-zinc tailings and acid leaching electrolytic manganese slag have a large amount of discharge, and the large-scale stacking of these two waste residues has caused serious environmental pollution and potential safety hazards. The main raw materials for preparing cement are limestone and clay (or shale) at present. The proportion of sulfuric acid produced from sulfur in my country has exceeded 50%, and the required sulfur is almost completely dependent on imports. Gypsum is a regulator of cement setting time and plays an important role in cement production. The content of sulfate in acid leaching electrolytic manganese slag exceeds 20%, which can be used as raw material for the preparation of sulfuric acid and gypsum, and the SiO 2 、Al 2 o 3 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/147C01B17/74C01F11/46
CPCC04B2103/0025C04B7/48
Inventor 吴显明何则强麻明友陈上肖卓炳刘建本陈良钢陈善文
Owner 湘西自治州兴湘科技开发有限责任公司
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